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Hua M.,Jiangsu Key Laboratory of New Energy Generation and Power Conversion | Zhang Y.,Nanjing Huashi Electronic Science and Technology Co. | Hu H.,Jiangsu Key Laboratory of New Energy Generation and Power Conversion | Xing Y.,Jiangsu Key Laboratory of New Energy Generation and Power Conversion | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

A three-phase power supply used in train's auxiliary power, which consisted of inverters distributed in every car, was proposed. The inverters mentioned are soft-started with local load at variable output frequency and operated in parallel in steady state with a novel wireless parallel control. A quasi-synchronization control method based on the space vector control (SVC) and referring the phase angle of the shared AC bus was proposed to effectively suppress the inrush currents among the inverters during hot plug. The current sharing in steady state as well as the reliability in dynamic process were improved greatly with combined droop and the quasi-synchronization method. The influence of the parallel inductors on parallel operation performance was analyzed in detailed with the design principle of the inductor given. A prototype system configured with two inverters in parallel was built with experiments in both the dynamic and steady states. Experimental results verify the validity of the proposed system and control. ©2012 Chinese Society for Electrical Engineering. Source


Hua M.,Jiangsu Key Laboratory of New Energy Generation and Power Conversion | Hu H.,Jiangsu Key Laboratory of New Energy Generation and Power Conversion | Xing Y.,Jiangsu Key Laboratory of New Energy Generation and Power Conversion | Zhang Y.,Nanjing Huashi Electronic Science and Technology Co. | And 3 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011

In order to cope with the drawbacks of conventional droop method, a hierarchical control for inverters in parallel operation without interconnection is proposed refering to the hierarchical control applied to power dispatching in AC power systems. The hierarchical control consist of three levels. The primary control is based on an improved droop method, the sharing of the active and reactive power in each module is controlled and balanced by adjusting the phase and amplitude of the output voltage respectively. The secondary control is to compensate the droop of the output voltage from its reference, induced by the droop control, to improve the load regulation performance of the inverter. The last but not the least control limits the phase deviation between the inverter and the shared AC bus in order to ensure all the parallel inverters keeping in phase with each other. The operational principle and implementation was analyzed in detail. A prototype, configured by two paralleled inverters, was set up, on which many dynamic and steady experiments were carried out. Experiment results verify the validility of the proposed control. ©2011 Chinese Society for Electrical Engineering. Source

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