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Journal articles on the topic 'Constant impedance load'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Chen, Shiwei, Ying Shen, and Xuhua Xia. "Voltage control strategy of output bus of grid-connected port of energy router based on energy feedback." Journal of Physics: Conference Series 2876, no. 1 (2024): 012058. http://dx.doi.org/10.1088/1742-6596/2876/1/012058.

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Abstract The remaining power conversion ports are equivalent to constant power loads for the grid-connected port of the voltage source. The negative impedance characteristics of the constant power loads will worsen the voltage source characteristics of the grid-connected port and even cause system instability. According to the influence mechanism of constant power load on the DC bus voltage control performance during grid-connection, a new voltage control strategy based on energy feedback is proposed in this paper. The simulation results show that the proposed control strategy can more effecti

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2

Ramya, Ramya, and Rex Joseph. "A comparative analysis of constant impedance and constant power loads in a distribution network." International Journal of Electrical and Computer Engineering (IJECE) 14, no. 6 (2024): 6111. http://dx.doi.org/10.11591/ijece.v14i6.pp6111-6121.

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Most conventional power systems adopt radial distribution network wherein multiple loads are connected across the distribution transformer. As the number of loads increases, it results in poor voltage profile at the distant receiving end reducing power delivery. This issue worsens with the large-scale influx of electric vehicles and power converter-fed loads, which draw constant power irrespective of supply voltage. Such loads exhibit negative incremental resistance behavior and also have a dynamic response which affects the network in a manner different from constant impedance loads. This pap

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3

Huang, Shichun, Liang Yu, and Weikang Jiang. "Measurement of loudspeaker mechanical impedance by changing the sound load at the throat of loudspeaker." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (2021): 5457–66. http://dx.doi.org/10.3397/in-2021-3112.

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A loudspeaker is a device that converts electrical energy into acoustic energy by coupling between electrical impedance, mechanical impedance, and radiation impedance. The loudspeaker electro-mechanical-acoustic coupling model provides the experimental feasibility to measure the characteristic parameters. In this paper, an economical and practical measurement method of loudspeaker mechanical impedance is proposed. First, the mathematical relationship between loudspeaker electrical impedance and mechanical impedance is obtained based on the loudspeaker electro-mechanical-acoustic coupling model

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Oh, HyungSeon. "Analytic solution to swing equations in power grids with ZIP load models." PLOS ONE 18, no. 6 (2023): e0286600. http://dx.doi.org/10.1371/journal.pone.0286600.

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Objective This research pioneers a novel approach to obtain a closed-form analytic solution to the nonlinear second order differential swing equation that models power system dynamics. The distinctive element of this study is the integration of a generalized load model known as a ZIP load model (constant impedance Z, constant current I, and constant power P loads). Methods Building on previous work where an analytic solution for the swing equation was derived in a linear system with limited load types, this study introduces two fundamental novelties: 1) the innovative examination and modeling

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Aromataris, Luis, Fabian Rinaudo, Juan Alemany, and Marcos Gelatto. "Induction motor: a new static model." Journal of Electrical Engineering 21, no. 3 (2021): 62–67. http://dx.doi.org/10.59168/zpsi3100.

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Voltage stability in power system is largely determined by the characteristics of the load. In order to obtain reliable results in voltage stability, the load model must be represented as realistically as possible. The issue is even more challenging with static voltage stability techniques, because dynamic loads must be represented by static models. The commonly used static models are constant impedance, constant current, and constant power. A significant part of the load is made up of induction motors that are usually modeled as static constant power loads. Under variations of terminal voltag

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Ravi Kant Yadav, Dibya Bharti, Mala De. "Improving Distribution System Performance using the Optimal Place-ment of Dgs and Reconfiguration for Different Load Models." Communications on Applied Nonlinear Analysis 32, no. 9s (2025): 977–1001. https://doi.org/10.52783/cana.v32.4072.

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The distribution system often gets significant power losses due to voltage drops. To address this issue, various techniques have been proposed in the literature, predominantly focusing on single-load models. This study introduces a methodology aimed to minimizing system losses and enhancing voltage profiles by integrating distributed generation (DG) placement with network reconfiguration (NR) for different load models. The analysis considers constant power (CP), constant current (CI), constant impedance (CZ), and constant impedance, current and power (ZIP) load models under varying load condit

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Battapothula, Gurappa, Chandrasekhar Yammani, and Sydulu Maheswarapu. "Multi-objective optimal planning of fast charging stations by considering various load models in distribution system." International Journal of Emerging Electric Power Systems 22, no. 4 (2021): 439–50. http://dx.doi.org/10.1515/ijeeps-2020-0252.

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Abstract Electric vehicles (EVs) load and its charging methodologies play a significant role in distribution system planning. The inaccurate modelling of EV load may overload the distribution system components, increase in Network Power Loss (NPL) and Maximum Voltage Deviation (MVD). The Constant Power (CP) load model is more popularly used to model both the conventional and EV loads in the distribution system. But the CP load modelling cannot provide accurate information of EV charging process. In this paper, the EV load is modelled as constant Impedance-constant Current-constant Power (ZIP),

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CHAUDHARY, MUHAMMAD AKMAL, JONATHAN LEES, JOHANNES BENEDIKT, and PAUL TASKER. "MULTI-TONE MEASUREMENT SYSTEM WITH THE STATE-OF-THE-ART ACTIVE IF AND RF LOAD-PULL CAPABILITY." Journal of Circuits, Systems and Computers 22, no. 07 (2013): 1350056. http://dx.doi.org/10.1142/s0218126613500564.

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This paper reports a refined multi-tone waveform measurement system for the robust characterization and optimization of nonlinear microwave devices when driven by broadband multi-tone stimuli. This enhanced system has the ability to present specific, constant broadband impedances, not only at baseband (IF) frequencies, but also at RF frequencies, particularly, around the carrier and significant harmonics. This functionality is key in studying the effects of out-of-band impedance termination on both short and long-term electrical memory effects. Achieving such comprehensive impedance control ac

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Sankar, R. S. Ravi, K. K. Deepika, and A. V. Satyanarayana. "Harmonic stability analysis of multi-paralleled 3-phase PV inverters tied to grid." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 2 (2021): 783. http://dx.doi.org/10.11591/ijpeds.v12.i2.pp783-792.

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In this paper the harmonic stability is investigated for multi paralleled three-phase photovoltaic inverters connected to grid. The causes to harmonically stabilize/destabilize the multi-paralleled PV inverters when tied to the grid isanalysed by the impedance-based stability criterion (IBSC). In this paper stability of the system is investigated by varying the grid inductance with constant grid resistance and also by varying load impedance while maintaining grid inductance constant. Stability of the multiple three phase inverters tied to the grid with different grid impedance, inductance valu

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R.S., Ravi Sankar, K. Deepika K., and Satyanarayana A.V. "Harmonic stability analysis of multi-paralleled 3-phase PV inverters tied to grid." International Journal of Power Electronics and Drive System (IJPEDS) 12, no. 2 (2021): 783–92. https://doi.org/10.11591/ijpeds.v12.i2.pp783-792.

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In this paper the harmonic stability is investigated for multi paralleled three-phase photovoltaic inverters connected to grid. The causes to harmonically stabilize/destabilize the multi-paralleled PV inverters when tied to the grid is analysed by the impedance-based stability criterion (IBSC). In this paper stability of the system is investigated by varying the grid inductance with constant grid resistance and also by varying load impedance while maintaining grid inductance constant. Stability of the multiple three phase inverters tied to the grid with different grid impedance, inductance val

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Monsalve-Rueda, Miguel, John E. Candelo-Becerra, and Fredy E. Hoyos. "Dynamic Behavior of a Sliding-Mode Control Based on a Washout Filter with Constant Impedance and Nonlinear Constant Power Loads." Applied Sciences 9, no. 21 (2019): 4548. http://dx.doi.org/10.3390/app9214548.

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Power converters (PCs) with their control techniques help regulate voltages of nodes in microgrids with different types of loads such as resistive, inductive, nonlinear, constant power, or critical loads. However, constant power loads (CPLs) affect the stability of the voltage in the output of PCs and are usually difficult to regulate with traditional control techniques. The sliding-mode control (SMC) with the washout filter technique has been recently proposed to address this issue, but studies that consider the phenomenon and parameters present in real systems are required. Therefore, this p

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12

Rahman, Atta, Irtaza Syed, and Mukhtar Ullah. "Small-Signal Stability Criteria in AC Distribution Systems—A Review." Electronics 8, no. 2 (2019): 216. http://dx.doi.org/10.3390/electronics8020216.

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AC distribution grid is prone to instability due to negative impedance and constant power nature of the load if it is dominant with power electronics-based components. There are various time-domain and frequency-domain modelling methods which use various methodologies and analytical tools. Also, there are many small-signal stability analysis (SSSA) methods and their different variants for different specific conditions and situation. This paper presents a review of SSSA methods in AC distribution grid using impedance-based models in a synchronous reference frame (SRF). By simplifying and conver

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Atawi, Ibrahem E., Ahmed M. Kassem, and Sherif A. Zaid. "Modeling, Management, and Control of an Autonomous Wind/Fuel Cell Micro-Grid System." Processes 7, no. 2 (2019): 85. http://dx.doi.org/10.3390/pr7020085.

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This paper proposes a microelectric power grid that includes wind and fuel cell power generation units, as well as a water electrolyzer for producing hydrogen gas. The grid is loaded by an induction motor (IM) as a dynamic load and constant impedance load. An optimal control algorithm using the Mine Blast Algorithm (MBA) is designed to improve the performance of the proposed renewable energy system. Normally, wind power is adapted to feed the loads at normal circumstances. Nevertheless, the fuel cell compensates extra load power demand. An optimal controller is applied to regulate the load vol

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14

Chen, Guodong, Chao Rao, Yue Sun, Zhenxin Chen, Chunsen Tang, and Zhenpeng Zhang. "Primary Control Method of Wireless Charging System Based on Load Characteristics." Energies 12, no. 7 (2019): 1269. http://dx.doi.org/10.3390/en12071269.

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Aiming at the output control issues of a lithium ion battery wireless charging system, a primary side control method based on load characteristic identification is proposed. The primary side impedance is calculated by detecting the effective value of the primary side voltage and current, and the mapping relationship between the equivalent load and the primary side impedance is established based on the AC impedance model. Using this mapping relation, the output of the secondary side can be regulated indirectly by controlling the input voltage of the inverter. Compared with the traditional contr

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15

Lamultree, Suthasinee. "Moving Reference Planes of Unit Cells of Reciprocal Lossy Periodic Transmission-Line Structures." ECTI Transactions on Electrical Engineering, Electronics, and Communications 16, no. 2 (2018): 15–20. http://dx.doi.org/10.37936/ecti-eec.2018162.171331.

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An analysis of moving reference planes of unit cells of reciprocal lossy periodic transmission-line (TL) structures (RLSPTLSs) by using the equivalent bi- characteristic-impedance transmission line (BCITL) model is presented. Applying the BCITL theory, only the equivalent BCITL parameters (characteristic impedances for wave propagating in forward and reverse directions and associated complex propagation constant) are of interest. In the analysis, an arbitrary infinite RLSPTLS is firstly considered by shifting a reference position of unit cells along TLs. Then, a semi-infinite terminated RLSPTL

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16

Ou, Zuoyuan, Yingpin Wang, Chang Su, Yi Qu, Hongyan Peng, and Xuguang Hao. "Precise model of LC active power filter and feedback linearization control." Journal of Physics: Conference Series 2232, no. 1 (2022): 012012. http://dx.doi.org/10.1088/1742-6596/2232/1/012012.

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Abstract The problems of regulating power quality are more prevalent. In general, Active power filter(APF) is one of the best solution. But the influence of load impedance and grid impedance were widely ignored by a great number of papers, supposed the load voltage is constant and modeling in APF singly, which can’t describe the system accurately. Firstly,there are build an accurate model, including LC APF, load and grid impedance. Secondly, applying feedback linearization and proportional resonant differentiation (FL-PRD) control in inner current loop. Then analyze the influence of load and g

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17

Hussain, S. N., R. L. Pardy, and J. A. Dempsey. "Mechanical impedance as determinant of inspiratory neural drive during exercise in humans." Journal of Applied Physiology 59, no. 2 (1985): 365–75. http://dx.doi.org/10.1152/jappl.1985.59.2.365.

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Five healthy males exercised progressively with small 2-min increments in work load. We measured inspiratory drive (occlusion pressure, P0.1), pulmonary resistance (RL), dynamic pulmonary compliance (Cdyn), transdiaphragmatic pressure (Pdi), and diaphragmatic electromyogram (EMGdi). Minute ventilation (VE), mean inspiratory flow rate (VT/TI), and P0.1 all increased exponentially with increased work load, but P0.1 increased at a faster rate than did VT/TI or VE. Thus effective impedance (P0.1/VT/TI) rose throughout exercise. The increasing P0.1 was mostly due to augmented Pdi and coincided with

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18

NAYFEH, ALI H., AHMAD M. HARB, and CHAR-MING CHIN. "BIFURCATIONS IN A POWER SYSTEM MODEL." International Journal of Bifurcation and Chaos 06, no. 03 (1996): 497–512. http://dx.doi.org/10.1142/s0218127496000217.

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Bifurcations are performed for a power system model consisting of two generators feeding a load, which is represented by an induction motor in parallel with a capacitor and a combination of constant power and impedance PQ load. The constant reactive power and the coefficient of the reactive impedance load are used as the control parameters. The response of the system undergoes saddle-node, subcritical and supercritical Hopf, cyclic-fold, and period-doubling bifurcations. The latter culminate in chaos. The chaotic solutions undergo boundary crises. The basin boundaries of the chaotic solutions

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19

Chattopadhyay, Tapan Kumar, Sumit Banerjee, and Chandan Kumar Chanda. "Voltage Stability Index of Radial Distribution Networks by Considering Distributed Generator for Different Types of Loads." International Journal of Energy Optimization and Engineering 5, no. 1 (2016): 1–22. http://dx.doi.org/10.4018/ijeoe.2016010101.

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The paper presents an approach on voltage stability analysis of distribution networks for loads of different types. A voltage stability index is proposed for identifying the node, which is most sensitive to voltage collapse. It is shown that the node, at which the value of voltage stability index is maximum, is more sensitive to voltage collapse. For the purpose of voltage stability analysis, constant power, constant current, constant impedance and composite load modeling are considered. Distributed generation can be integrated into distribution systems to meet the increasing load demand. It i

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20

Mobarak, Youssef Ahmed, and Mahmoud M. Hussein. "Voltage Instability of Initiation Fault Duration as Influenced by Nodes Short Circuit Levels NSCL with Different Types of Loads." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 3 (2016): 1305. http://dx.doi.org/10.11591/ijece.v6i3.10163.

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The occurrence of voltage instabilities or voltage collapses depend on the duration of the persistence of the fault and on the type of fault, some faults lead to voltage instabilities, others lead to voltage collapse. Evaluation of fault durations causing occurrence of voltage instabilities is the main goal of this paper. This paper searches for the effect of nodes short circuit levels NSCL and its duration periods initiation of voltage instability, with lagging and leading load power factors at certain loads buses. In this paper, the power system dynamic simulation program is developed for dy

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Mobarak, Youssef Ahmed, and Mahmoud M. Hussein. "Voltage Instability of Initiation Fault Duration as Influenced by Nodes Short Circuit Levels NSCL with Different Types of Loads." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 3 (2016): 1305. http://dx.doi.org/10.11591/ijece.v6i3.pp1305-1318.

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The occurrence of voltage instabilities or voltage collapses depend on the duration of the persistence of the fault and on the type of fault, some faults lead to voltage instabilities, others lead to voltage collapse. Evaluation of fault durations causing occurrence of voltage instabilities is the main goal of this paper. This paper searches for the effect of nodes short circuit levels NSCL and its duration periods initiation of voltage instability, with lagging and leading load power factors at certain loads buses. In this paper, the power system dynamic simulation program is developed for dy

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22

del Giudice, Davide, Federico Bizzarri, Samuele Grillo, Daniele Linaro, and Angelo Maurizio Brambilla. "Impact of Passive-Components’ Models on the Stability Assessment of Inverter-Dominated Power Grids." Energies 15, no. 17 (2022): 6348. http://dx.doi.org/10.3390/en15176348.

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Power systems are experiencing some profound changes, which are posing new challenges in many different ways. One of the most significant of such challenges is the increasing presence of inverter-based resources (ibrs), both as loads and generators. This calls for new approaches and a wide reconsideration of the most commonly established practices in almost all the levels of power systems’ analysis, operation, and planning. This paper focuses specifically on the impacts on stability analyses of the numerical models of power system passive components (e.g., lines, transformers, along with their

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Venkatesh, P., and N. Visali. "Investigations on hybrid line stability ranking index with polynomial load modeling for power system security." Electrical Engineering & Electromechanics, no. 1 (January 4, 2023): 71–76. http://dx.doi.org/10.20998/2074-272x.2023.1.10.

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Introduction. In recent years, numerous non-renewable and renewable energies are connected to the grid to meet the demand. Also, transient variation with loads poses the shortcomings for generating units, transmission and distribution networks. In this regard, the study on choice of suitable load modelling is essential to predict the system characteristics. The aspect of the research design is a ZIP load model, which, when combined with contingency criteria and constant-impedance, constant-current, and constant-power loads, produces realistic and long-term load representations. Purpose. The pr

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24

Seva Bala Sundaram, Mithila, Wai Tong Chor, Jeyraj Selvaraj, Ab Halim Abu Bakar, and ChiaKwang Tan. "Categorization of Residential Appliances Using ZIP Load Modeling and Conservation Voltage Reduction Analysis." Energies 18, no. 8 (2025): 1999. https://doi.org/10.3390/en18081999.

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This research aimed to ascertain the ZIP (constant impedance, constant current, and constant power) coefficients and Conservation of Voltage Reduction factor (CVRf) for residential appliances as well as for the residential network feeders in Malaysia through measurement and simulation analysis. The required power data were obtained through varying the supply voltage from 250 V to 215 V with a 5 V reduction. The appliances’ components were identified using the ZIP coefficients solved with the Sequential Least Squares Programming optimizer in Python (Spyder 5.5.4). The CVRf for residential appli

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25

Kouzou, Abdellah, and Haitham Abu-Rub. "Multiphase Z-source inverter using maximum constant boost control." Archives of Control Sciences 23, no. 1 (2013): 107–26. http://dx.doi.org/10.2478/v10170-011-0045-8.

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Abstract This paper deals with the impedance source (Z-source) multiphase inverter, where the maximum constant boost control method is studied and analyzed in the general case of number of phases. On the other side the impact of the modulation index and the number of phases on the duty cycle shoot-through and on the gain of the output voltage ranges is presented. To validate advantages of the Z-source multiphase inverter, the proposed topology and the maximum constant boost control are implemented in simulation and in real time experimentation with Z-source five phase inverter. The output volt

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26

Diard, J. P., B. Le Gorrec, C. Montella, C. Poinsignon, and G. Vitter. "Impedance measurements of polymer electrolyte membrane fuel cells running on constant load." Journal of Power Sources 74, no. 2 (1998): 244–45. http://dx.doi.org/10.1016/s0378-7753(98)00056-1.

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Pang, Weichao, Fujun Qi, Jun Wang, Fuqiang Zhao, Qijun Song, and Xingyu Pan. "A Power Flow Calculation Method Considering High-order Load Models." Journal of Physics: Conference Series 2527, no. 1 (2023): 012020. http://dx.doi.org/10.1088/1742-6596/2527/1/012020.

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Abstract Given the popularity of new energy and the connection between large power electronic equipment and power system, the operation of power system becomes more complex and requires higher accuracy of power flow calculation. Therefore, a power flow calculation method considering high-order load model is proposed. On the basis of the Newton-Raphson method, when considering the load voltage characteristics, it is necessary to change the variables in the Newton-Raphson method power flow. Therefore, the established polynomial load model is introduced into the Newton-Raphson method, and the eff

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28

Wang, Mian, Fen Tang, Xuezhi Wu, Jingkai Niu, Yajing Zhang, and Jiuhe Wang. "A Nonlinear Control Strategy for DC-DC Converter with Unknown Constant Power Load Using Damping and Interconnection Injecting." Energies 14, no. 11 (2021): 3031. http://dx.doi.org/10.3390/en14113031.

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DC-DC converters with constant power loads are mostly used in DC microgrids. Negative impedance and large disturbances of constant power loads may lead to the instability of DC-DC converters. To address this issue, a nonlinear control strategy consisting of an improved passivity-based controller and nonlinear power observer is proposed in this paper. First, an improved passivity-based controller is designed based on the port-controlled Hamiltonian with dissipation model. By proper damping and interconnection injecting, the fast dynamic response of output voltage and stability of the DC-DC conv

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29

Yang, Hanwu, Zicheng Zhang, Jingming Gao, Tao Xun, and Song Li. "A Repetitive Low Impedance High Power Microwave Driver." Electronics 11, no. 5 (2022): 784. http://dx.doi.org/10.3390/electronics11050784.

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A low impedance high power microwave (HPM) driver is designed, which can be used in studying multi-gigawatt HPM devices such as the magnetically insulated transmission line oscillator (MILO), based on a helical pulse forming line (PFL) and the Tesla pulse transformer technology. The co-axial PFL is insulated by ethanol–water mixture, whose dielectric constant can be adjusted; and the helical line increases the output pulse width as well as the impedance to make a better match with the load. By the optimal combination of PFL charging voltage and output switch working voltage, the reliability of

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30

P., Venkatesh, and Visali N. "Investigations on hybrid line stability ranking index with polynomial load modeling for power system security." Electrical Engineering & Electromechanics, no. 1 (January 4, 2023): 71–76. https://doi.org/10.20998/2074-272X.2023.1.10.

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<strong><em>Introduction. </em></strong><em>In recent years, numerous non-renewable and renewable energies are connected to the grid to meet the demand. Also, transient variation with loads poses the shortcomings for generating units, transmission and distribution networks. In this regard, the study on choice of suitable load modelling is essential to predict the system characteristics. The aspect of the research design is a ZIP load model, which, when combined with contingency criteria and constant-impedance, constant-current, and constant-power loads, produces realistic and long-term lo

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31

Eftekhari, Saeid, and Mahmoud Oukati Sadegh. "The effect of load modelling on phase balancing in distribution networks using search harmony algorithm." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 3 (2019): 1461. http://dx.doi.org/10.11591/ijece.v9i3.pp1461-1471.

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<p>Due to the unequal loads in phases and different customer consumption, the distribution network is unbalanced. Unbalancing in the distribution network, in addition to increasing power losses, causes unbalancing in voltages and increases operating costs. To reduce this unbalancing, various methods and algorithms have been presented. In most studies and even practical projects due to lack of information about the network loads, load models such as constant power model, constant current or constant impedance are used to model the loads. Due to the changing and nonlinear behaviours of tod

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Saeid, Eftekhari, and Oukati Sadegh Mahmoud. "The effect of load modelling on phase balancing in distribution networks using search harmony algorithm." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 3 (2019): 1461–71. https://doi.org/10.11591/ijece.v9i3.pp1461-1471.

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Due to the unequal loads in phases and different customer consumption, the distribution network is unbalanced. Unbalancing in the distribution network, in addition to increasing power losses, causes unbalancing in voltages and increases operating costs. To reduce this unbalancing, various methods and algorithms have been presented. In most studies and even practical projects due to lack of information about the network loads, load models such as constant power model, constant current or constant impedance are used to model the loads. Due to the changing and nonlinear behaviours of today's

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Wang, Hong Yan, Xiao Biao Shan, and Tao Xie. "Complex Impedance Matching for Power Improvement of a Circular Piezoelectric Energy Harvester." Applied Mechanics and Materials 148-149 (December 2011): 169–72. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.169.

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The impedance matching and the optimization of power from a circular piezoelectric energy harvester with a central-attached mass are studied. A finite element model is constructed to analyze the electrical equivalent impedance of the circular piezoelectric energy harvester. Furthermore, the complex conjugate matching load is used to extract the maximum output power of the energy harvester. The power output from complex conjugate matching load is compared with the power output from the resistive matching load and a constant resistance, separately. The results suggest that the complex conjugate

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LOKESH DEVARAJAN and SENTHILSINGH CHELLATHURAI. "AQUILA OPTIMIZED NONLINEAR CONTROL FOR DC-DC BOOST CONVERTER WITH CONSTANT POWER LOAD." REVUE ROUMAINE DES SCIENCES TECHNIQUES — SÉRIE ÉLECTROTECHNIQUE ET ÉNERGÉTIQUE 69, no. 4 (2024): 419–24. http://dx.doi.org/10.59277/rrst-ee.2024.69.4.9.

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Constant power loads (CPL) can be operated by tight-controlled power electronic converters, which have negative impedance and absorb continuous power. Constant power load creates instability in an open-loop system because of its negative incremental impedance. To tackle this problem, a discrete sliding-mode (AQO-DSM) nonlinear control technique has been proposed for a DC-DC boost converter fed CPL based on Aquila optimization. In this paper, the proposed AQO-DSM controllers provide the system stability during a steady state and maintain output voltage regardless of input voltage or CPL variati

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Xiao, Zhao-Xia, Jia-Ning Cao, Hong-Chi Zhu, et al. "Parallel Power Sharing Control of Multi-Controllable Rectifiers in a High-Power DC Fast Charging Station." World Electric Vehicle Journal 14, no. 7 (2023): 193. http://dx.doi.org/10.3390/wevj14070193.

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The increase in demand for the fast charging of electric vehicles (EVs) has promoted research and the application of high-power direct current (DC) fast charging stations, and research on the stability control of charging stations with a parallel structure of multi-controllable rectifier modules is of great significance. Taking into account the dynamic and steady-state performance, the parameters of the dual-loop controller based on virtual impedance control are designed to realize the power sharing of multi-controllable rectifier modules. The constant power load model of EV charging at a cons

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Awang, Bin Jusoh, Firdaus Abd Razak Muhammad, Hamka Bin Saiful Mohamad, and Sutikno Tole. "Passive Damper Network in a Simple DC Distribution Power System." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 1 (2018): 544–55. https://doi.org/10.11591/ijece.v8i1.pp544-555.

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Distributed power system (DPS) distributes power amongst processing units such as power electronics converters with DC system. Due to the increasing usage of power converters in DPS system, the system becomes unstable and the converter tends to draw constant power needed by the load of the system. Constant power load (CPL) characteristic has negative input impedance that could produce instability problems in the DC bus system. Passive damping network which consists of series RC damping circuit was connected in parallel to the DC bus system with the purpose to reduce the instability. The passiv

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Li, Zhongkui, and Yuan Fu. "Research on Control Strategy of Constant Power Output in MCRWPT System." Journal of Physics: Conference Series 2537, no. 1 (2023): 012001. http://dx.doi.org/10.1088/1742-6596/2537/1/012001.

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Abstract During wireless charging, the change of battery resistance will cause the fluctuation of output power, which will shorten the battery life and affect the charging safety. According to the theoretical analysis of WPT, when the load resistance changes, the output power can be stabilized by adjusting the input voltage of the system. Aiming at the variable load MCRWPT system, that is, only the load resistance changes under the resonant state, this paper designs the MCRWPT constant power control system by using the principle of reflective impedance and using the phase-shifting control volt

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Sanli, Abdulkadir, and Olfa Kanoun. "Electrical impedance analysis of carbon nanotube/epoxy nanocomposite-based piezoresistive strain sensors under uniaxial cyclic static tensile loading." Journal of Composite Materials 54, no. 6 (2019): 845–55. http://dx.doi.org/10.1177/0021998319870592.

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Carbon nanotubes-based nanocomposites have gained a great amount of attraction and play a key role in the realization of strain sensors owing to their remarkable physical properties. In this study, the piezoresistivity of multi-walled carbon nanotubes (MWCNTs)/epoxy-based nanocomposite-based strain sensor under static tensile load is examined using electrochemical impedance spectroscopy. Morphological examinations show that MWCNTs are randomly and homogeneously distributed in the epoxy polymer matrix. A simplified resistance constant phase element model is proposed and validated by impedance s

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Chuaqui, H., E. Wyndham, C. Friedli, and M. Favre. "LLAMPÜDKEÑ: A high-current, low-impedance pulser employing an auxiliary exponential transmission line." Laser and Particle Beams 15, no. 2 (1997): 241–48. http://dx.doi.org/10.1017/s0263034600010569.

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The design and constructional aspects of a novel pulse power generator for use in dense plasma research presently under construction are presented. The generator consists of two Marx capacitor banks, each of 0.25 μF, 480 kV, and 28.8 kJ. Each Marx generator drives a water transmission line, in which the live electrode is the central conductor. The transmission lines consist of a constant impedance section followed by a multielectrode gas linegap followed by an exponential taper to the load section. The novel feature is the use of an auxiliary exponential line coupled at the load. This line con

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Kamalakkannan, S., and D. Kirubakaran. "Solar energy based impedance-source inverter for grid system." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 1 (2019): 102–8. https://doi.org/10.11591/ijece.v9i1.pp102-108.

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In this work, the fickleness of solar energy can be overcome by using Maximum Power Point Tracking algorithm (MPPT). Perturb and Observation (P&O) MPPT algorithm accomplish fast the maximum power point for rapid change of environmental conditions such as irradiance intensity and temperature. The MPPT algorithm applied to solar PV system keep the boost converter output constant. Output from boost converter is taken to three phase impedance-source inverter with RL load and grid system. Impedance-source inverter performs the transformation of variable DC output of the solar PV system in to ne

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Islam, Shekh Md Mahmudul, Mohammad Anisur Rahman Reza, and Md Adnan Kiber. "Performances of Multi-Frequency Voltage to Current Converters for Bioimpedance Spectroscopy." Bangladesh Journal of Medical Physics 5, no. 1 (2013): 71–76. http://dx.doi.org/10.3329/bjmp.v5i1.14671.

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Breast cancer is one of the most common diseases affecting women and the mortality rate is very high in Bangladesh, mainly due to the lack of early diagnosis. X-ray mammography is not available widely in Bangladesh, besides it has an associated biological hazard. Multi-frequency bio-impedance measurement or bio-impedance spectroscopy has a great potential in many biomedical applications including breast cancer screening which involves tissue characterization. In Bio-impedance spectroscopy a range of frequencies of low level current is injected to the human body and corresponding bio-impedance

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Kamalakkannan, S., and D. Kirubakaran. "Solar Energy System Based Impedance-Source Inverter for Grid Connected System." International Journal of Applied Power Engineering (IJAPE) 7, no. 2 (2018): 129. http://dx.doi.org/10.11591/ijape.v7.i2.pp129-138.

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In this work, the fickleness of solar energy can be overcome by using Maximum Power Point Tracking algorithm (MPPT). Perturb and Observation (P&amp;O) MPPT algorithm accomplish fast the maximum power point for rapid change of environmental conditions such as irradiance intensity and temperature. The MPPT algorithm applied to solar system keep the boost converter output constant. Output from boost converter is taken to three phase impedance-source inverter with RL load and grid system. Impedance-source inverter performs the transformation of variable DC output of the solar system in to near

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43

Kamalakkannan, S., and D. Kirubakaran. "Solar Energy System Based Impedance-source Inverter for Grid Connected System." International Journal of Applied Power Engineering 7, no. 2 (2018): 129–38. https://doi.org/10.11591/ijape.v7.i2.pp129-138.

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In this work, the fickleness of solar energy can be overcome by using Maximum Power Point Tracking Algorithm (MPPT). Perturb and Observation (P&O) MPPT algorithm accomplish fast the maximum power point for rapid change of environmental conditions such as irradiance intensity and temperature. The MPPT algorithm applied to solar system keep the boost converter output constant. Output from boost converter is taken to three phase impedance-source inverter with RL load and grid system. Impedance-source inverter performs the transformation of variable DC output of the solar system in to near sin

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44

Kamalakkannan, S., and D. Kirubakaran. "Solar energy based impedance-source inverter for grid system." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 1 (2019): 102. http://dx.doi.org/10.11591/ijece.v9i1.pp102-108.

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<span lang="EN-US">In this work, the fickleness of solar energy can be overcome by using Maximum Power Point Tracking algorithm (MPPT). Perturb and Observation (P&amp;O) MPPT algorithm accomplish fast the maximum power point for rapid change of environmental conditions such as irradiance intensity and temperature. The MPPT algorithm applied to solar PV system keep the boost converter output constant. Output from boost converter is taken to three phase impedance-source inverter with RL load and grid system. Impedance-source inverter performs the transformation of variable DC output of

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Liao, Weiqiang, Xin Dong, Rongfeng Yang, and Zhongfei Qiao. "Control Optimization Method for Ship Direct Current Microgrid Based on Impedance Reshaping." Journal of Marine Science and Engineering 12, no. 3 (2024): 503. http://dx.doi.org/10.3390/jmse12030503.

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In response to the constant power negative impedance characteristics on the load side of a ship DC microgrid, leading to voltage oscillation issues in the DC bus, this paper proposes a control optimization method based on impedance reshaping using bus voltage feedback. First, a simplified small-signal diagram of a lithium battery energy storage system converter is analyzed. Combining active damping control technology, an impedance regulator is introduced, and its parameters are optimized to effectively reduce the output impedance magnitude on the power source side. Subsequently, a ship DC micr

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Zheng, Bangjie, Zhiqun Cheng, Zhiwei Zhang, Ruizhe Zhang, Tingwei Gong, and Chao Le. "An X-Band Class-J GaN MMIC Power Amplifier with Well-Designed In-Band Output Power Flatness." Micromachines 16, no. 1 (2025): 87. https://doi.org/10.3390/mi16010087.

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This paper presents an X-band high-power GaN MMIC power amplifier (PA). To balance efficiency, output power, and saturated power flatness, the load-line theory is employed to analyze and validate the power variation trends within an extended continuous Class B/J (CCBJ) impedance space. Theoretical constant power contours are plotted within this space. An L-C impedance matching network is used to match the amplifier’s output impedance to the overlapping region of the 0.5 dB constant power contour and the CCBJ impedance space, significantly improving the in-band power flatness of the PA based on

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Kang, Wei, Li Xia Zhang, and Ji Bo Wan. "Matching Characteristic of Constant Voltage Source Excited Filter in Power System." Applied Mechanics and Materials 427-429 (September 2013): 1072–75. http://dx.doi.org/10.4028/www.scientific.net/amm.427-429.1072.

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Filters between voltage source converter and the batteries in power system can be categorized into constant voltage source excited filters. The paper discusses the importance of the matched structure and parameters for power filters. The relation between matched structure and filters output characteristic is demonstrated and the design principle is introduced. The work above proved that even if the filters are designed for the same transfer function, so long as filters load resistance is different, their designed parameters are also different. Traditional power system filter seldom consider it

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Al-Mahammedi, Mohammed Turki Fayyadh, and Mustafa Onat. "Optimal Siting, Sizing, and Energy Management of Distributed Renewable Generation and Storage Under Atmospheric Conditions." Sustainability 17, no. 1 (2025): 300. https://doi.org/10.3390/su17010300.

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Integrating new generation and storage resources within power systems is challenging because of the stochastic nature of renewable generation, voltage regulation, and the use of microgrids. Classical optimization methods struggle with these nonlinear, multifaceted issues. This paper presents a novel optimization framework for integrating, sizing, and siting distributed renewable generation and energy storage systems in power distribution networks. To accurately reflect load variability, the framework considers four distinct load models—constant impedance, current, power, and ZIP (constant impe

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Zhu, Hong, Xing Zhang, Ming Li, and Xiaoxi Liu. "Research on Multifunctional High-Power Grid Source Simulator System with Synchronous Generator, Line Impedance Imitation, and ZIP Load Emulator." Energies 12, no. 24 (2019): 4657. http://dx.doi.org/10.3390/en12244657.

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As the penetration of distributed power sources in the power grid is getting higher and higher, the adverse effects are also increasing. It is necessary to adopt control technology to make the distributed power source participate in the power regulation of the power system. In this paper, a multifunctional high-power grid source simulator system is presented. For wider control bandwidth and better performance, a high-power, back-to-back converter and an auxiliary lower-power, back-to-back converter connected in cascade mode topology is proposed in this paper. The basic principle and implementa

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Alidrissi, Youssef, Radouane Ouladsine, Abdellatif Elmouatamid, Rachid Errouissi, and Mohamed Bakhouya. "Constant Power Load Stabilization in DC Microgrids Using Continuous-Time Model Predictive Control." Electronics 11, no. 9 (2022): 1481. http://dx.doi.org/10.3390/electronics11091481.

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Despite its advantages over its AC counterparts, DC microgrids present a lot of challenges. One of these challenges is the instability issues caused by constant power loads (CPLs). CPLs deteriorate the system’s performance due to their incremental negative impedance characteristics. In this paper, a DC microgrid composed of a PV/battery system feeding a pure CPL was considered. A continuous-time model predictive control combined with a disturbance observer was applied to the DC–DC bidirectional converter. The purpose of the composite controller is to address the nonlinearity of the CPL and to

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