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Power conditioning system of Flywheel Energy Storage
Zhongwei Chen,Xudong Zou,Shanxu Duan,Huarong Wei 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In a Flywheel Energy Storage system (FESS), the power conditioning system is the key component of controlling power transfer between the Flywheel and the power system. The dynamics of the power conditioning system directly affect the effect of FESS in dynamic regulation of power system. In this paper, power conditioning system which is made up of a doubly-fed induction machine (DFIM) connected with flywheel, a back-to-back converter for AC excitation and an excitation vector control system is studied. The excitation control strategy is presented for FESS DFIM to improve transient stability and increase transfer capability of power systems. The proposed control method has good dynamics that can respond to the system power demand quickly and accurately. Moreover, the proposed control method has good robust characteristic and applicability to improve the performance of power conditioning system. Simulation and experiment results are performed to evaluate the performance of the proposed control method.
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A Novel Filter for Harmonics and Inter-harmonics Analysis and Suppression in AC Electronic Load
Huang Zhaoxia,Zou Xudong,Li Fen,Zou Yunping,Tong Li 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
AC electronic load (ACEL) based on current-controlled AC/DC/AC PWM converters is a simple kind of application for ac power source burn-in test with energy recycling capability. According to instantaneous power theory, the harmonics relationship in steady state between the ac side and the dc side of AC/DC converter and DC/AC converter in ACEL is investigated. When the frequency of the tested source is different from that of the grid, the harmonics and inter-modulation production in the dc bus is analyzed in detail, The accuracy of the harmonics relationship and theoretical expectation in ACEL are demonstrated by Matlab/Simulink simulations under different operation conditions. In addition, to decrease intrinsic-harmonics voltage of dc bus, a novel algorithm for output current reference is put forward. The proposed method is validated to be effective for suppressing the output current harmonics and inter-harmonics inject to the grid by simulations and experiments.
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