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《High Voltage Engineering》 2008-01

Reactive Power of Converter DC-side in AC/DC Power System

SHI Chun-lei, CHEN Yun-ping, GONG Qing-wu, CHEN Yu-lin(School of Electrical Engineering, Wuhan University, Wuhan 430072, China)
Based on the mathematical model of reactive power for arbitrarily periodical voltage and current waveform, which obey the fundamental energy conservation law, reactive power of rectifier(inverter) dc-side in AC/DC system is analyzed and calculated, its mathematical model is derived and physical essence is described. The model of a typical AC/DC power system is established using the PSCAD/EMTDC software, output data and curves of simulation are analyzed, and the reactive power of the AC/DC system is calculated. The full system, including AC and DC systems, is modeled by connecting all individual transfers together with appropriate system equations and nodal analysis. The example is presented to verify the correctness and feasibility of the definition of the reactive power I/V pair and reactive power for arbitrarily periodical voltage and current.It is pointed out that the physical essence of reactive power is interactions of voltages and currents of different frequencies, which suffices fundamental energy conservation.
【Fund】： 国家自然科学基金(50477018)~~
【CateGory Index】： TM744
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