The Experts below are selected from a list of 43512 Experts worldwide ranked by ideXlab platform
Frede Blaabjerg - One of the best experts on this subject based on the ideXlab platform.
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highly accurate derivatives for lcl filtered grid converter with Capacitor Voltage active damping
IEEE Transactions on Power Electronics, 2016Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede Blaabjerg, Yi TangAbstract:The middle Capacitor Voltage of an LCL -filter, if fed back for synchronization, can be used for active damping. An extra sensor for measuring the Capacitor current is then avoided. Relating the Capacitor Voltage to existing popular damping techniques designed with Capacitor current feedback would however demand a noise-sensitive derivative term. Digital implementation of this derivative term is generally a challenge with many methods presently developed for resolving it. These methods are however still facing drawbacks, which have comprehensively been explained in this paper. Two derivatives are then proposed, based on either second-order or nonideal generalized integrator. Performances of these derivatives have been found to match the ideal “ s ” function closely. Active damping based on Capacitor Voltage feedback can therefore be realized accurately. Experimental results presented have verified the effectiveness of the proposed derivative, which can similarly be used with other applications, where differentiation is needed.
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Digital realization of Capacitor-Voltage feedback active damping for LCL-filtered grid converters
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede BlaabjergAbstract:The Capacitor Voltage of an LCL-filter can also be used for active damping, if it is fed back for synchronization. By this way, an extra current sensor can be avoided. Compared with the existing active damping techniques designed with Capacitor current feedback, the Capacitor Voltage feedback active damping would however demand a noise-sensitive derivative term. A digital realization of this derivative term is generally a challenge with many methods developed for resolving it. However, these methods are still facing drawbacks, which have been comprehensively explained in this paper. To overcome their drawbacks, a new derivative method is then proposed, based on the non-ideal generalized integrator. The performance of the proposed derivative has been found to match the ideal “s” function closely. Active damping based on Capacitor Voltage feedback can therefore be realized accurately, as demonstrated by the presented experimental results.
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SOGI-based Capacitor Voltage feedback active damping in LCL-filtered grid converters
2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG), 2015Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede BlaabjergAbstract:The Capacitor Voltage feedback active damping control is an attractive way to suppress LCL-filter resonance especially for the systems where the Capacitor Voltage is used for grid synchronization, since no extra sensors are added. The derivative is the core of the Capacitor Voltage feedback active damping control. However, in digital systems, the discrete implementation of the derivative suffers from noise amplification and accuracy issues. To overcome these drawbacks, this paper proposes a new derivative method based on Second-Order Generalized Integrator. Theoretical study shows that the proposed derivative is more suited for Capacitor Voltage feedback active damping control. Experimental results validate the effectiveness of the proposed method.
Yong Kang - One of the best experts on this subject based on the ideXlab platform.
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Characteristic analysis and experimental verification of a novel Capacitor Voltage control strategy for three-phase MMC-DSTATCOM
2015 IEEE Applied Power Electronics Conference and Exposition (APEC), 2015Co-Authors: Ke Dai, Yong Kang, Cong LiuAbstract:A novel Capacitor Voltage control strategy for three-phase distribution static synchronous compensators (DSTATCOM) based on modular multilevel converters (MMC) is proposed in this paper. Firstly, modeling of circular interaction among the electrical quantities for MMC-STATCOM is established. And the improved Capacitor Voltage control structure consists of three loops, a) total active power control loop for the entire apparatus, b) the arm Capacitor Voltage balancing control loop for each phase and c) individual Capacitor Voltage balancing control loop in each arm. The output of total active power control is added to the current tracking control as active current reference. The arm Capacitor Voltage balancing control is critical for the stable operation of the MMC-DSTATCOM, especially in capacitive var compensation mode. A set of cosine functions instead of the output currents is proposed for the individual Capacitor Voltage balancing control in this paper. Since output current measurement is avoided in the individual Capacitor Voltage balancing control, the number of current sensors and data communication resources are reduced, especially for practical applications based on MMC with a large number of modules. The effectiveness of the above Capacitor Voltage three-loop control architecture is verified completely by detailed analysis and experimental results from a MMC-DSTATCOM laboratory prototype with multi-DSP controller system.
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a novel dc Capacitor Voltage balance control method for cascade multilevel statcom
IEEE Transactions on Power Electronics, 2012Co-Authors: Zhao Liu, Bangyin Liu, Shanxu Duan, Yong KangAbstract:This paper presents a novel dc Capacitor Voltage balance control method for cascade multilevel static synchronous compensator (STATCOM) and a general analytical method for balance control strategy. Considering that the imbalance of dc Capacitor Voltage is caused by the inconsistency of active power absorbed and consumed by chain, a balance control strategy based on active Voltage vector superposition is proposed, in which an active Voltage component is superposed to chain's output Voltage to change its absorbed active power. A general analytical method based on vector analysis is also presented, by which the performance of balance control strategy can be analyzed, including stability and regulation capacity. To find out the most appropriate balance control strategy, a comparison still based on vector analysis among the proposed and other two commonly used methods is provided, from which it can be known that the proposed balance control strategy has the advantage of good stability and strong regulation capacity, and simulations are performed to prove it. The effectiveness of proposed control scheme has been verified by experimental results based on a three-phase 36-chain cascade multilevel STATCOM laboratory prototype.
Zhen Xin - One of the best experts on this subject based on the ideXlab platform.
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highly accurate derivatives for lcl filtered grid converter with Capacitor Voltage active damping
IEEE Transactions on Power Electronics, 2016Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede Blaabjerg, Yi TangAbstract:The middle Capacitor Voltage of an LCL -filter, if fed back for synchronization, can be used for active damping. An extra sensor for measuring the Capacitor current is then avoided. Relating the Capacitor Voltage to existing popular damping techniques designed with Capacitor current feedback would however demand a noise-sensitive derivative term. Digital implementation of this derivative term is generally a challenge with many methods presently developed for resolving it. These methods are however still facing drawbacks, which have comprehensively been explained in this paper. Two derivatives are then proposed, based on either second-order or nonideal generalized integrator. Performances of these derivatives have been found to match the ideal “ s ” function closely. Active damping based on Capacitor Voltage feedback can therefore be realized accurately. Experimental results presented have verified the effectiveness of the proposed derivative, which can similarly be used with other applications, where differentiation is needed.
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Digital realization of Capacitor-Voltage feedback active damping for LCL-filtered grid converters
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede BlaabjergAbstract:The Capacitor Voltage of an LCL-filter can also be used for active damping, if it is fed back for synchronization. By this way, an extra current sensor can be avoided. Compared with the existing active damping techniques designed with Capacitor current feedback, the Capacitor Voltage feedback active damping would however demand a noise-sensitive derivative term. A digital realization of this derivative term is generally a challenge with many methods developed for resolving it. However, these methods are still facing drawbacks, which have been comprehensively explained in this paper. To overcome their drawbacks, a new derivative method is then proposed, based on the non-ideal generalized integrator. The performance of the proposed derivative has been found to match the ideal “s” function closely. Active damping based on Capacitor Voltage feedback can therefore be realized accurately, as demonstrated by the presented experimental results.
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SOGI-based Capacitor Voltage feedback active damping in LCL-filtered grid converters
2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG), 2015Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede BlaabjergAbstract:The Capacitor Voltage feedback active damping control is an attractive way to suppress LCL-filter resonance especially for the systems where the Capacitor Voltage is used for grid synchronization, since no extra sensors are added. The derivative is the core of the Capacitor Voltage feedback active damping control. However, in digital systems, the discrete implementation of the derivative suffers from noise amplification and accuracy issues. To overcome these drawbacks, this paper proposes a new derivative method based on Second-Order Generalized Integrator. Theoretical study shows that the proposed derivative is more suited for Capacitor Voltage feedback active damping control. Experimental results validate the effectiveness of the proposed method.
Poh Chiang Loh - One of the best experts on this subject based on the ideXlab platform.
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highly accurate derivatives for lcl filtered grid converter with Capacitor Voltage active damping
IEEE Transactions on Power Electronics, 2016Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede Blaabjerg, Yi TangAbstract:The middle Capacitor Voltage of an LCL -filter, if fed back for synchronization, can be used for active damping. An extra sensor for measuring the Capacitor current is then avoided. Relating the Capacitor Voltage to existing popular damping techniques designed with Capacitor current feedback would however demand a noise-sensitive derivative term. Digital implementation of this derivative term is generally a challenge with many methods presently developed for resolving it. These methods are however still facing drawbacks, which have comprehensively been explained in this paper. Two derivatives are then proposed, based on either second-order or nonideal generalized integrator. Performances of these derivatives have been found to match the ideal “ s ” function closely. Active damping based on Capacitor Voltage feedback can therefore be realized accurately. Experimental results presented have verified the effectiveness of the proposed derivative, which can similarly be used with other applications, where differentiation is needed.
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Digital realization of Capacitor-Voltage feedback active damping for LCL-filtered grid converters
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede BlaabjergAbstract:The Capacitor Voltage of an LCL-filter can also be used for active damping, if it is fed back for synchronization. By this way, an extra current sensor can be avoided. Compared with the existing active damping techniques designed with Capacitor current feedback, the Capacitor Voltage feedback active damping would however demand a noise-sensitive derivative term. A digital realization of this derivative term is generally a challenge with many methods developed for resolving it. However, these methods are still facing drawbacks, which have been comprehensively explained in this paper. To overcome their drawbacks, a new derivative method is then proposed, based on the non-ideal generalized integrator. The performance of the proposed derivative has been found to match the ideal “s” function closely. Active damping based on Capacitor Voltage feedback can therefore be realized accurately, as demonstrated by the presented experimental results.
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SOGI-based Capacitor Voltage feedback active damping in LCL-filtered grid converters
2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG), 2015Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede BlaabjergAbstract:The Capacitor Voltage feedback active damping control is an attractive way to suppress LCL-filter resonance especially for the systems where the Capacitor Voltage is used for grid synchronization, since no extra sensors are added. The derivative is the core of the Capacitor Voltage feedback active damping control. However, in digital systems, the discrete implementation of the derivative suffers from noise amplification and accuracy issues. To overcome these drawbacks, this paper proposes a new derivative method based on Second-Order Generalized Integrator. Theoretical study shows that the proposed derivative is more suited for Capacitor Voltage feedback active damping control. Experimental results validate the effectiveness of the proposed method.
Xiongfei Wang - One of the best experts on this subject based on the ideXlab platform.
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highly accurate derivatives for lcl filtered grid converter with Capacitor Voltage active damping
IEEE Transactions on Power Electronics, 2016Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede Blaabjerg, Yi TangAbstract:The middle Capacitor Voltage of an LCL -filter, if fed back for synchronization, can be used for active damping. An extra sensor for measuring the Capacitor current is then avoided. Relating the Capacitor Voltage to existing popular damping techniques designed with Capacitor current feedback would however demand a noise-sensitive derivative term. Digital implementation of this derivative term is generally a challenge with many methods presently developed for resolving it. These methods are however still facing drawbacks, which have comprehensively been explained in this paper. Two derivatives are then proposed, based on either second-order or nonideal generalized integrator. Performances of these derivatives have been found to match the ideal “ s ” function closely. Active damping based on Capacitor Voltage feedback can therefore be realized accurately. Experimental results presented have verified the effectiveness of the proposed derivative, which can similarly be used with other applications, where differentiation is needed.
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Digital realization of Capacitor-Voltage feedback active damping for LCL-filtered grid converters
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede BlaabjergAbstract:The Capacitor Voltage of an LCL-filter can also be used for active damping, if it is fed back for synchronization. By this way, an extra current sensor can be avoided. Compared with the existing active damping techniques designed with Capacitor current feedback, the Capacitor Voltage feedback active damping would however demand a noise-sensitive derivative term. A digital realization of this derivative term is generally a challenge with many methods developed for resolving it. However, these methods are still facing drawbacks, which have been comprehensively explained in this paper. To overcome their drawbacks, a new derivative method is then proposed, based on the non-ideal generalized integrator. The performance of the proposed derivative has been found to match the ideal “s” function closely. Active damping based on Capacitor Voltage feedback can therefore be realized accurately, as demonstrated by the presented experimental results.
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SOGI-based Capacitor Voltage feedback active damping in LCL-filtered grid converters
2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG), 2015Co-Authors: Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede BlaabjergAbstract:The Capacitor Voltage feedback active damping control is an attractive way to suppress LCL-filter resonance especially for the systems where the Capacitor Voltage is used for grid synchronization, since no extra sensors are added. The derivative is the core of the Capacitor Voltage feedback active damping control. However, in digital systems, the discrete implementation of the derivative suffers from noise amplification and accuracy issues. To overcome these drawbacks, this paper proposes a new derivative method based on Second-Order Generalized Integrator. Theoretical study shows that the proposed derivative is more suited for Capacitor Voltage feedback active damping control. Experimental results validate the effectiveness of the proposed method.
