Study on Inter-harmonics in Short-Circuit Current of Hybrid AC/DC Electric Power Systems
With the widespread application of HVDC technology, power system harmonics generated by power electronic equipments can no longer be neglected. For example, the real-time current signal processing for protective relays or PMUs might be deeply affected by harmonics. In order to tackle with the accuracy for relays and PMUs, the inter-harmonic source for short-circuit current is theoretically analyzed, based on the interactions between low frequency oscillations in the power system electromechanical stability area and the electromagnetic transient process during faults. A typical hybrid AC/DC system is modeled and simulated, quantitative analyses on the inter-harmonic components in short-circuit current waveform are conducted with 51Hz and 52.5Hz simulated low frequency oscillation AC sources separately. The inter-harmonic phenomenon in transient short-circuit current is demonstrated by the simulation results, and it is suggested that the influence of inter-harmonic should not be neglected during online real-time signal processing of protective relays or PMUs.
Hybrid AC-DC System Inter-harmonics Low Frequency Oscillation Short-Circuit Current
Jian He Jun Liu Xudong Hao Xu Wang Xudong Zhang
State Grid Beijing Electric Power Company. Beijing,100031,China Shaanxi Key Laboratory of Smart Grid,School of Electrical Engineering,Xian Jiaotong University,Xia
国际会议
西安
英文
1-5
2016-09-01（万方平台首次上网日期，不代表论文的发表时间）