Relevant bibliographies by topics / Direct Drive Variable Speed

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Direct Drive Variable Speed'

Author: Grafiati
Published: 20 February 2023

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Journal articles on the topic "Direct Drive Variable Speed"

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Shaharudin, Nurshahirah, Mohd Zamri Hasan, and Syatirah Mohd Noor. "Direct Current (DC) Motor Speed and Direction Controller." Journal of Physics: Conference Series 2129, no. 1 (December 1, 2021): 012035. http://dx.doi.org/10.1088/1742-6596/2129/1/012035.

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Abstract The direct current motor is an important drive configuration for many applications across a wide range of power and speeds. It has variable characteristics and is used extensively in variable-speed drives. The goals of this project are to control the direction and speed of a Direct Current (DC) motor. Due to the advancement of wireless technology, there are several communication devices introduced such as GSM, Wi-Fi, ZIGBEE and Bluetooth. Each of the connections has its own unique specification and application. Among these wireless connections, Bluetooth technology is often implemented and can be sent from the mobile phone at a distance of 10 meters. The speed control was implemented using Bluetooth technology to provide communication access from a smartphone. Instead, the ARDUINO UNO platform can be used to quickly promote electronic systems. And an electronics technique is called Pulse Width Modulation (PWM) is used to achieve speed control, and this technique generates high and low pulses, then these pulses vary the speed in the motor. In order to control this PWM pulse, variable resistors are used and depend on it the speed of the DC motor will increase or decrease. The variable resistor is adjusting to varying the speed of the motor, and the higher the resistance the lower the speed of the motor rotates. The direction of the motor is controlled by the relay by giving and giving a command on the virtual terminal. The speed of the motor is directly proportional to the resistance as the speed increased after the resistance also increased and vice versa. The significance of this study is practical and highly feasible from the economic point of view and has the advantage of running the motor at a higher rating in term of a reliable, durable, accurate and efficient way of controlling speed and direction control.
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Liu, Jinpu, and Guanghui Nie. "Variable Speed Control Analysis of Direct-Drive Wind Turbines Incorporating the Variable Gain Pitch Knowledge Identification Algorithm." Mobile Information Systems 2022 (September 16, 2022): 1–12. http://dx.doi.org/10.1155/2022/6242534.

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For direct-drive wind turbines, effective methods can be adopted to reduce the generator speed fluctuation under the rated wind speed. However, there is a nonlinear relationship between the change of pitch angle of wind turbine and wind speed. In order to obtain the maximum power of the wind turbine, under the working condition of wind gust, this paper takes the principle of prior action of the pitch control and uses the variable gain pitch knowledge identification algorithm to achieve the effective control of the motor speed by designing the power pitch generator on the pitch controller to ensure that the pitch angle can be operated quickly under the rated power, and at the same time, the nonlinearities are added to the speed control process of the pitch angle generator. The gain factor of the pitch angle generator speed control process can ensure that the pitch control can work in advance under the wind gust environment. Finally, the simulation results show that the two gust control methods can achieve effective suppression of wind turbine generator in the case of overspeed, which can effectively increase the power generation of wind farms, reduce the load of wind turbines, and improve the operating stability of the system.
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Zhong, Mei Peng, and Feng Li Huang. "Control of Direct-Drive Compressor Based on Variable Structure Sliding Mode." Applied Mechanics and Materials 88-89 (August 2011): 122–27. http://dx.doi.org/10.4028/www.scientific.net/amm.88-89.122.

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In order to reduce vibration a new variable structure sliding mode control strategy was proposed in direct-drive air compressor,because torque fluctuate of direct-drive air compressor is large. In order to reduce volume and economize energy, direct-drive air compressor dived by permanent magnet synchronous motor(PMSM). Mathematics model of air compressor torque was built up, and load of air compressor was analyzed. Mathematics model and torque equation of PMSM were built up. Variable structure sliding mode to PMSM was built up. Basing on characteristic to control of PMSM and load of air compressor, the system was simulated in simulink. The result shows that rotate speed fluctuate of direct-drive air compressor controlled by variable structure sliding mode is less than that of direct-drive air compressor controlled by PI. The test of direct-drive air compressor dived by PSMS was done. Experimental results verified that variable structure sliding mode control strategy improve dynamic quality of system and has good robustness. Volume a of Direct-drive air compressor dived by permanent magnet PMSM are little, and its efficiency is high.
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R, Mini, Saranya C, B. Hariram Satheesh, and Dinesh M.N. "Low Speed Estimation in Sensorless Direct Torque Controlled Induction Motor Drive using Extended Kalman Filter." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 4 (December 1, 2015): 819. http://dx.doi.org/10.11591/ijpeds.v6.i4.pp819-830.

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Sensorless Direct Torque Control (DTC) is a powerful control scheme for high performance control of induction motor (IM) drives, which provides very quick dynamic response with simple structure and a decoupled control of torque and flux. The performance of the DTC drive depends greatly on the accuracy of the estimated flux components, torque and speed, using monitored stator voltages and currents. Low speed estimation is a great challenge because of the presence of transient offset, drift and domination of ohmic voltage drop.Extended Kalman filter (EKF) is a non linear adaptive filter which performs the process of finding the best estimate from the noisy data based on state space techniques and recursive algorithm.This paper mainly focuses on the accurate estimation of speed ranging from very low speed to rated speed using the equation of motion. A new state space model of the IM is developed for estimation in EKF, with load torque as an input variable and not as an estimated quantity which is the case in most previous studies.The developed algorithm is validated using MATLAB-Simulink platform for speeds ranging from low speed to rated speed at rated torque and at various torque conditions. An exhaustive analysis is carried out to validate the performance of DTC Induction motor drive especially at the low speeds. The results are promising for accurate estimation of speed ranging from low speed to rated speed using EKF.
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Zhou, Qixun, Hao Gong, Guanghui Du, Yingxing Zhang, and Hucheng He. "Distributed Permanent Magnet Direct-Drive Belt Conveyor System and Its Control Strategy." Energies 15, no. 22 (November 19, 2022): 8699. http://dx.doi.org/10.3390/en15228699.

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The long-distance traditional belt conveyor driven by a single high-power motor has the problems of excessive tension increments and sharp fluctuations in speed and tension. This paper designs a distributed permanent magnet direct drive belt conveyor system. The dynamic model of the conveyor belt unit and the permanent magnet motor is analyzed. The multi-motor ring coupling control strategy and the double sliding film direct torque control strategy of the belt conveyor system are formulated. The mechanical-electrical coupling dynamic model of the belt conveyor system is built. Using MATLAB/Simulink modeling and simulation, the vector control strategy and electromechanical coupling dynamic behavior of the traditional belt conveyor system and the distributed permanent magnet direct drive belt conveyor system under light load start-up and local variable load operation conditions are studied. The results show that: the distributed permanent magnet direct drive belt conveyor system significantly reduces the peak of conveyor belt tension increment; the time spent under the starting light-load operation condition is shorter, and the fluctuation amplitude of speed and tension is smaller; it is possible to reduce the speed and tension fluctuation range of the conveying system and improve the robustness of the conveying system under local variable load conditions. Experiments have verified that increasing the number of drive motors in a conventional belt conveyor can suppress the disturbance caused by local load changes, and the distributed permanent magnet direct-drive belt conveyor has better dynamic regulation performance.
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R, Mini, Shabana Backer P., B. Hariram Satheesh, and Dinesh M. N. "Low Speed Estimation of Sensorless DTC Induction Motor Drive Using MRAS with Neuro Fuzzy Adaptive Controller." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (October 1, 2018): 2691. http://dx.doi.org/10.11591/ijece.v8i5.pp2691-2702.

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<p>This paper presents a closed loop Model Reference Adaptive system (MRAS) observer with artificial intelligent Nuero fuzzy controller (NFC) as the adaptation technique to mitigate the low speed estimation issues and to improvise the performance of the Sensorless Direct Torque Controlled (DTC) Induction Motor Drives (IMD). Rotor flux MRAS and reactive power MRAS with NFC is explored and detailed analysis is carried out for low speed estimation. Comparative analysis between rotor flux MRAS and reactive power MRAS with PI as well as NFC as adaptive controller is performed and results are presented in this paper. The comparative analysis among these four speed estimation methods shows that reactive power MRAS with NFC as adaptation mechanism shows reduced speed estimation error and actual speed error at steady state operating conditions when the drive is subjected to low speed operation. Simulation carried out using MATLAB-Simulink software to validate the performance of the drive especially at low speeds with rated and variable load conditions.</p>
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ULUTAŞ, Alper, and Tarık DURU. "Variable-Speed Direct-Drive Permanent Magnet Synchronous Generator Wind Turbine Modeling and Simulation." Kocaeli Journal of Science and Engineering 2, no. 1 (May 31, 2019): 21–27. http://dx.doi.org/10.34088/kojose.515467.

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Chung, S. K. "Robust speed control of brushless direct-drive motor using integral variable structure control." IEE Proceedings - Electric Power Applications 142, no. 6 (1995): 361. http://dx.doi.org/10.1049/ip-epa:19952230.

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Torres, Eduardo, and Mario Garcia-Sanz. "Experimental results of the variable speed, direct drive multipole synchronous wind turbine TWT1650." Wind Energy 7, no. 2 (April 2004): 109–18. http://dx.doi.org/10.1002/we.113.

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Qiao, Shan, Jian Ying Xu, and Bing Han. "A Direct Torque Controlled Permanent Magnet Synchronous Motor Drive with Variable Parameters Speed Regulator." Advanced Materials Research 655-657 (January 2013): 1510–14. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.1510.

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This paper reports results of further investigation of the direct torque control to a permanent magnet synchronous motor drive. A variable parameters speed controller is proposed from the point of view of speed control to accelerate the dynamic response and increase the control precision and decrease the torque ripple of the system. It is presented that a reference flux vector calculation direct torque control system with a speed controller using different proportional and integral coefficients, and a novel torque-limiting method is recommended. The simulation results show that the control system can improve its performances and limit torque ripple effectively.
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Dissertations / Theses on the topic "Direct Drive Variable Speed"

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Bouwer, Pieter. "Modelling, design and implementation of a small-scale, position sensorless, variable speed wind energy conversion system incorporating DTC-SVM of a PMSG drive with RLC filter." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80242.

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Thesis (MScEng)--Stellenbosch University, 2013.
Wind energy has proven to be a viable source of clean energy, and the worldwide demand is growing rapidly. Variable speed topologies, with synchronous generators and full-scale converters, are becoming more popular, and the e ective control of these systems is a current trend in wind energy research. The purpose of this study is the modelling, design, simulation and implementation of a small-scale, variable speed wind energy conversion system, incorporating the position sensorless direct torque control with space vector modulation, of a permanent magnet synchronous generator, including an RLC converter lter. Another aim is the development of a gain scheduling algorithm that facilitates the high level control of the system. Mathematical models of the combined lter-generator model, in the stationary and rotating reference frames, are presented and discussed, from which equivalent approximate transfer functions are derived for the design of the controller gains. The design of the controller gains, RLC lter components, gain scheduling concept and maximum power point tracking controller are presented. It is discovered that the RLC lter damping resistance has a signi cant e ect on the resonance frequency of the system. The system is simulated dynamically in both Simulink and the VHDL-AMS programming language. Additionally, the maximum power point tracking controller is simulated in the VHDL-AMS simulation, including a wind turbine simulator. The simulation results demonstrate good dynamic performance, as well as the variable speed operation of the system. The practical results of torque and speed controllers show satisfactory performance, and correlate well with simulated results. The detailed gain scheduling algorithm is presented and discussed. A nal test of the complete system yields satisfactory practical results, and con rms that the objectives of this thesis have been reached.
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Saad, S. "Efficiency of mining electrical variable speed drive systems." Thesis, University of Nottingham, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381103.

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Dridi, Hocine. "Microprocessor control of a DC variable speed drive." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319962.

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Salmon, John C. "A variable speed unipolar induction motor inverter drive." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46449.

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Djebarri, Sofiane. "Contribution à la modélisation et à la conception optimale de génératrices à aimants permanents pour hydroliennes." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0012/document.

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L'amélioration des performances des chaînes de conversion dédiées à la récupération d'énergie par les hydroliennes est un point particulièrement important pour rendre cette ressource économiquement attractive. La minimisation du coût de l'énergie produite passe nécessairement par une amélioration des performances de la chaîne de conversion électromécanique et une réduction des coûts de maintenance et de production des éléments la constituant. Dans ce contexte particulier, les génératrices à aimants permanents apparaissent particulièrement intéressantes dans la mesure où elles sont bien adaptées à un fonctionnement à basse vitesse et à fort couple. Ceci permet d'éliminer des systèmes mécaniques très complexes, encombrants et exigeants en maintenance, tels que le multiplicateur de vitesse et/ou le système d'orientation des pales. L'objectif de cette thèse est d’explorer un certain nombre de pistes concernant les outils, les concepts et les règles de conception à mettre en oeuvre pour dimensionner une génératrice associée en entraînement direct à une turbine hydrolienne à pas fixe. Les outils mis au point dans ces travaux englobent des modèles multi-physiques intégrés dans une démarche de conception qui se veut la plus globale possible. Cette méthodologie tient compte de la caractéristique de la ressource (courants de marées), de celle de la turbine (hélice), des spécifications de la génératrice à aimants permanents, de la mise en oeuvre d’une stratégie de pilotage associant MPPT et limitation de puissance par défluxage à fort courants de marées, en plus des contraintes liées au convertisseur. L'environnement de conception développé est basé sur un couplage des modèles dans une procédure d'optimisation. Les résultats obtenus mettent en lumière les points clés associés au développement d’une telle génératrice pour un contexte hydrolien
The improvements of marine current turbines drive train are key features to ensure safe operation and to make tidal energy resource cost-attractive. In this context, eliminating mechanical systems that demand high-level of maintenance can be an interesting way to improve the global behavior of tidal turbines. For that purposes, the presented studies focus on design methodologies and concepts of direct-driven generators associated with fixed-pitch turbines. The proposed designs are based on multiphysics models of the generator that are integrated in an optimization process taking into account the drive train environment. For these reasons, several models have been integrated into a global design strategy in order to find solutions that improve marine current turbines performances. This strategy is based on the use of an optimization process that combines electromagnetic model, thermal model, turbine performances model, and tidal resource velocity profile. This methodology integrates also an efficient control strategy based on a maximum power point tracking (MPPT) approach at low tidal speed and a flux-weakening power limitation control at high tidal speed. This control at high tidal velocities is in this work achieved by considering only the generator electrical control without using blade pitching systems. The obtained results highlight trends that could lead to an improvement of the design and they help designers to set relevant technological choices in order to ensure significant cost reduction and highly improve the reliability of marine current turbines
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Wheeler, Jeremy Nicholas. "Back-to-back converters for variable speed motor drive applications." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294550.

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Chikwanda, Herbert Simbarashe. "The naturally commutated, converter-fed, variable speed induction machine drive." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/47805.

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Patel, Sagarkumar. "Speed Control of Three-Phase Induction Motor Using Variable Frequency Drive." Thesis, California State University, Long Beach, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10690223.

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There are various methods for speed control of induction motors. This paper specifically describes one of the methods: speed control using variable frequency. The proposed system is a MATLAB simulink model, which is a closed loop model designed to achieve desired speed control of a three-phase induction motor by varying its frequency. The simulink model has four main blocks, namely the inverter, synchronous machine, proportional integral control and current hysteresis control. For accuracy of output results and simplicity, we have used dq to abc transformation block and sin function block. The inverter is comprised of six integrated gate bipolar transistors (IGBTs), which are fired by gate pulses generated by current hysteresis control block. The inverter generates variable frequency and variable voltage output, which is given to motor terminals. The project presents the working principle of variable frequency drive (VFD), its performance, and the use of Pulse Width Modulation (PWM) in a three-phase inverter to control the frequency and thus the speed. The proposed method conformed to performance predictions and delivered the desired outputs.

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Alolah, A. I. "Microprocessor controlled three-phase inverter for variable-speed induction motor drive." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371466.

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Onwunta, Onwunta Emea Kalu. "Enhanced energy-efficient parallel pumping using variable speed drive (VSD) technology." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/2198.

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Thesis (MTech(Electrical Engineering))--Cape Peninsula University of Technology, 2011.
Global economic meltdown appears to be a new phenomenon in this 21 st century because worldwide poor financial situation seemed forgotten after the Great Depression of the 1930s. However, energy crisis has been a common worldwide issue and challenge since the October 1973 war in the Middle East which triggered the first of two waves of energy-price increases in the 1970s. That event catapulted the debate about energy and conservation, from its obscure beginnings, in academic and policy circles to sudden public prominence. The recent co-incidence of South Africa's energy crisis with the global financial crisis was a double tragedy. The main reason for the 2007 to 2008 energy crisis in South Africa was the imbalance between electricity supply and demand Globally about 40% of industrial electricity is consumed by Electric Motor-Driven Systems (EMDS) and South African estimates are around 60%. Pumping systems are crucial industrial EMDS and their energy demand ranges from 25% to 50% of the energy usage in certain industrial plant operations. In South Africa, an estimated 15% of generated electrical power is consumed by pumping systems.
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Books on the topic "Direct Drive Variable Speed"

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Variable speed drive fundamentals. Lilburn, GA: Fairmont Press, 1994.

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Variable speed drive fundamentals. 2nd ed. Liburn, GA: Fairmont Press, 1997.

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Variable speed drive fundamentals. 3rd ed. Lilburn, GA: Fairmont Press, 1999.

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Ryan, Maura C. Adjustable speed drive reference guide. [Toronto, Canada]: Ontario Hydro, 1991.

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Howenstein, Douglas M. Adjustable speed drive (ASD): Feasibility analysis. Champaign, Ill: Dept. of the Army Construction Engineering Research Laboratories, 1993.

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Finney, David. Variable frequency AC motor drive systems. London: Peregrinus, 1988.

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Variable frequency AC motor drive systems. London, U.K: P. Peregrinus on behalf of the Institution of Electrical Engineers, 1988.

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Systems, International Conference on Power Electronics and Drive. 1997 International Conference on Power Electronics and Drive Systems: Proceedings, 26-29 May, 1997, Singapore. New York: Institute of Electrical and Electronics Engineers, 1997.

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International Conference on Power Electronics and Drive Systems. Proceedings of 1995 International Conference on Power Electronics and Drive Systems: 21-24 February, 1995, Singapore. Piscataway, NJ: Institute of Electrical and Electronics Engineers, 1995.

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International Conference on Power Electronics and Drive Systems. Proceedings of 1995 International Conference on Power Electronics and Drive Systems: 21-24 February, 1995, Singapore. Piscataway, NJ: IEEE, 1995.

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Book chapters on the topic "Direct Drive Variable Speed"

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Aarif, Mohammad, Deepak Joshi, Raunak Jangid, and Sasanka Sekhor Sharma. "Grid Power Smoothing Management for Direct-Drive PMSG Variable-Speed Wind Energy Conversion System with Multilevel Converter." In ICT Infrastructure and Computing, 19–28. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5331-6_3.

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Husain, Mohammed Aslam, S. P. Singh, and Md Tabrez. "Intelligent Approach for Performance Investigation of Direct-Drive Generator-Based Wind Energy Conversion System Under Variable Speed Operation." In Lecture Notes in Electrical Engineering, 471–83. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6081-8_23.

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Proskuriakov, N. E., I. V. Lopa, and A. I. Zhukaev. "Variable Speed Mechanisms of the Pipeline Valve Drive." In Lecture Notes in Mechanical Engineering, 259–68. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-54814-8_32.

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Devos, Thomas, and François Malrait. "Embedded Estimation of Variable Speed Drive Input Current Distortion." In Springer Proceedings in Energy, 633–48. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-69799-0_45.

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Tahour, Ahmed, Abdel Ghani Aissaoui, Najib Essounbouli, and Frederick Nollet. "Variable Speed Drive of Wind Turbine Based on Synchronous Generator." In Sustainability in Energy and Buildings, 3–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27509-8_1.

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Guchhait, Pabitra Kumar, Suvadip Roy, and Abhik Banerjee. "PIC Controller Based SVPWM Technique for Induction Motor Variable Speed Drive." In Lecture Notes in Electrical Engineering, 541–53. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7031-5_52.

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Brock, S. "Hybrid PI Sliding Mode Position and Speed Controller for Direct Drive." In Mechatronics 2013, 741–48. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02294-9_93.

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Badri, Bechir, Marc Thomas, and Sadok Sassi. "Variable Drive Frequency Effect on Spindle Dynamic Behavior in High Speed Machining." In Condition Monitoring of Machinery in Non-Stationary Operations, 547–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28768-8_56.

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Hadhiq Khan, Shoeb Hussain, and Mohammad Abid Bazaz. "ANFIS Based Speed Controller for a Direct Torque Controlled Induction Motor Drive." In Advances in Intelligent Systems and Computing, 891–902. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-47952-1_71.

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Li, Lingbo, Chunmei Xu, Jing Wei, Yifei Zhang, Haoying Pei, and Lijun Diao. "Multi-mode Control of Variable-Speed Generator Set in Multi-energy Drive System." In Proceedings of the 5th International Conference on Electrical Engineering and Information Technologies for Rail Transportation (EITRT) 2021, 111–19. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9905-4_13.

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Conference papers on the topic "Direct Drive Variable Speed"

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Vickers, S. I. "Matrix converter application for direct-drive gas turbine generator sets." In 6th International Conference on Power Electronics and Variable Speed Drives. IEE, 1996. http://dx.doi.org/10.1049/cp:19960896.

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Stinson, James E. "The Direct-Drive Variable-Speed Drive Head for PCPs Saves Big Bucks." In SPE Production Operations Symposium. Society of Petroleum Engineers, 2005. http://dx.doi.org/10.2118/93913-ms.

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Hubbard, Chase, Rob Hovsapian, and Srinivas Kosaraju. "Variable Speed Direct Drive Wind Controller for a Rim Driven Wind Turbine." In ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/es2012-91334.

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Multi-blade shaft driven wind turbines depend greatly on the angle of attack as an important factor that the control system monitors such that a maximum amount of aerodynamic force is seen by the rotor blades. This is one significant difference when controlling a Rim Driven Wind Turbine (RDWT). The controller for a RDWT is required to simply point the tower such that it is facing the wind for maximum power generation. This is achieved by incorporating a Variable Speed Direct Drive (VSDD) wind operation control system to control the power production and safe operation of the RDWT. Another consideration for the control system is its integration with the generator. Since the power generation is rim driven, thus operating at a higher variable speed. With information related to the wind turbine’s diameter and the wind speed at any given time it can be calculated how much power can be potentially generated. This can then be in turn relayed to the generator from the wind turbine controller. This information can be relayed using controller-controller communication (such as an analog voltage signal or protocol based communication such as MODBUS RTU or TCP/IP) representing the power coefficient from Betz’ Law. A feasibly controllable system implements a signal from the overall wind turbine controller that in turn supplies the generator with how much power is available in the system to maximize power generation for a broad range of traditionally unrealizable wind conditions (3 m/s to 30 m/s). Rim Driven Wind Turbines represent an evolution in fundamental design of how the wind can be harnessed for power. This paper will discuss the VSDD’s unique design and aspects of maintaining controllability thorough out the overall system operation.
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Sutherland, Herbert, and Palmer Carlin. "Damage measurements on the NWTC direct-drive, Variable-Speed Test Bed." In 1998 ASME Wind Energy Symposium. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-64.

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Chowdhury, M. M., M. E. Haque, A. Gargoom, A. M. O. Haruni, and M. Negnevitsky. "Control of a grid connected direct drive variable speed wind turbine." In 2012 IEEE International Conference on Power System Technology (POWERCON 2012). IEEE, 2012. http://dx.doi.org/10.1109/powercon.2012.6401370.

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Schmidt, Lasse, Torben O. Andersen, Henrik C. Pedersen, and Anders H. Hansen. "An Energy Efficient Hydraulic Winch Drive Concept Based on a Speed-Variable Switched Differential Pump." In ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4266.

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The application of valve driven hydraulic winch drives is related to substantial power losses, primarily due to throttle generated valve flows. More energy efficient solutions are also commonly applied in terms of conventional hydrostatic closed circuit drives as well as so-called secondary controls. Such solutions are typically constituted by many and rather expensive components, and are furthermore often suffering from low frequency dynamics. In this paper an alternative solution is proposed for winch drive operation, which is based on the so-called speed-variable switched differential pump, originally designed for direct drive of hydraulic differential cylinders. This concept utilizes three pumps, driven by a single electric servo drive. The concept is redesigned for usage in winch drives, driven by flow symmetric hydraulic motors and single directional loads as commonly seen in e.g. active heave compensation applications. A general drive configuration approach is presented, along with a proper control strategy and design. The resulting concept is evaluated when applied for active heave compensation. Results demonstrate control performance on level with conventional valve solutions in terms of motion tracking, however with improved efficiency, especially in the event that the electrical servo drive can realize four quadrant operation.
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Izuno, Y. "New speed tracking controlled direct-drive servo system using compact travelling-wave type ultrasonic motor." In Proceedings of 5th International Conference on Power Electronics and Variable-Speed Drives. IEE, 1994. http://dx.doi.org/10.1049/cp:19941025.

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Carlin, Palmer, Lee Fingersh, Palmer Carlin, and Lee Fingersh. "Some preliminary results from the NWTC direct-drive, variable-speed test bed." In 35th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-966.

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Rufer, A. C. "A direct coupled 4-quadrant multilevel converter for 16." In 6th International Conference on Power Electronics and Variable Speed Drives. IEE, 1996. http://dx.doi.org/10.1049/cp:19960956.

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Jinupun, P. "Direct torque control for sensor-less switched reluctance motor drives." In Seventh International Conference on Power Electronics and Variable Speed Drives. IEE, 1998. http://dx.doi.org/10.1049/cp:19980546.

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Reports on the topic "Direct Drive Variable Speed"

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Lipo, T. A., and P. Tenca. Design and Test of a Variable Speed Wind Turbine System Employing a Direct Drive Axial Flux Synchronization Generator: 29 October 2002 - 31 December 2005. Office of Scientific and Technical Information (OSTI), July 2006. http://dx.doi.org/10.2172/887343.

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Xu, Tengfang. Best Practices for Energy Efficient Cleanrooms Efficient HVACSystems: Variable-Speed-Drive Chillers. Office of Scientific and Technical Information (OSTI), June 2005. http://dx.doi.org/10.2172/895796.

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Kwesiga, Victoria, Zita Ekeocha, Stephen Robert Byrn, and Kari L. Clase. Compliance to GMP guidelines for Herbal Manufacturers in East Africa: A Position Paper. Purdue University, November 2021. http://dx.doi.org/10.5703/1288284317428.

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With the global increase in the use of traditional and complementary remedies for the prevention and treatment of illness, the quality and safety of these medicines have become a significant concern for all regulatory authorities. Herbal medicines are the most commonly used form of traditional and complementary medicines in the world and the efficacy and safety of herbal medicines, like conventional medicines, largely depends on their quality from planting to harvesting, preprocessing and final processing. Due to the inherent complexity of herbal medicines, often containing an array of active compounds, the primary processing of herbal medicines has a direct influence on their quality. Quality concerns are the reason why the medicines regulatory agencies insist that manufacturers of medicines strictly follow Good Manufacturing Practices since it is an essential tool to prevent instances of contamination, mix-ups, deviations, failures and errors. However, a strict application of GMP requirements is expensive and would drive the prices of the manufactured products up. As a result, a maturity level grading of facilities is proposed as a way of justifying the costs incurred for manufacturers desiring to reach a broader market and investing in continuous improvement. 36 Good Manufacturing Practice (GMP) inspection reports of local herbal manufacturers conducted by National Drug Authority were analyzed to establish the type and extent of deficiencies to GMP requirements for local herbal manufacturers in Uganda. The different GMP chapters and related sub-parameters constituted the variables used for the analysis of conformity to requirements. The primary outcome variable was the conclusion regarding compliance or noncompliance of the inspected local herbal manufacturing facility. GMP parameters that were frequently defaulted by local herbal manufacturers and the corresponding frequencies were identified. The Pearson Chi-square test was applied independently on each category to find the association that existed between conformity and the questions in each category. Only 22% (8) of the 30 inspected facilities were found to comply with GMP requirements, as per National Drug Authority (NDA) guidelines; while the majority of the facilities, 28 (78%), were found not to comply. Of the facilities inspected, 25 were undergoing GMP inspection for the first time. A total of 1,236 deficiency observations were made in the 36 inspection reports reviewed for the study. The mean for all deficiencies was 34.3, and the standard deviation was 15.829. 91.5% of the facilities did not have mechanisms for a record of market complaints; 80.9% did not meet documentation requirements; 78.9% did not have quality control measures in place, and 65.7% did not meet stores requirements. By encouraging a culture of self/voluntary improvement through the introduction of listing of manufacturers based on a maturity level grading, the National Drug Authority will improve the Herbal Medicines sector as per the mandate of improving the herbal medicine industry. Also, increased sensitization of all relevant stakeholders regarding the requirements for GMP should be intensified.
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Low Wind Speed Technology Phase II: Development of a 2-MW Direct-Drive Wind Turbine for Low Wind Speed Sites; Northern Power Systems. Office of Scientific and Technical Information (OSTI), March 2006. http://dx.doi.org/10.2172/878477.

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Low Wind Speed Technology Phase II: Investigation of the Application of Medium-Voltage Variable-Speed Drive Technology to Improve the Cost of Energy from Low Wind Speed Turbines; Behnke, Erdman and Whitaker Engineering, Inc. Office of Scientific and Technical Information (OSTI), March 2006. http://dx.doi.org/10.2172/878476.

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