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《Electric Machines and Control》 2010-05
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New power calculation method and realization of parallel inverters

WANG Hong-liang1, YUE Xiu-mei2, PEI Xue-jun1, KANG Yong1 (1.Department of Electrical and Electronic Engineering,Huazhong University of Science and Technology, Wuhan 430074,China; 2. Department of Electrical and Electronic Engineering, Huangshi Institute of Technology,Huangshi 435003,China)  
As the integral delay of traditional power calculation impacts the parallel inverters stability and dynamic performance in digital-domain,a method without integral unit is presented,which is based on si-nusoidal signal three-elements to reproduce the time-domain voltage and current in digital-domain. It can obtain the real-time active power and reactive power only according to the last and present values of volta-ges and currents. Moreover,it has good dynamic performance because it knows the true power value only one sampling time delay once the load step change. In addition,it occupies much smaller DSP space be-cause of the absence of sine and cosine tables and simplifies greatly power calculation process. The com-parisons of ideal value and simulation value express that the proposed method has great precision and fast dynamic response because of the steady error is smaller than 0. 04% . The experiments results show that the propose method is effective under various loads by using two 75 kVA/50 Hz inverters.
【Fund】: 国家自然科学基金重点项目(50737004)
【CateGory Index】: TM464
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