Abstract：This paper presents a novel method to online identify detuning components of the filter at the DC side in HVDC system. This method only needs to measure the current of each branch of the filter and analyzes the harmonic component, and then identifies the detuning component through calculating the change rates of several harmonic currents. The principle and the implementation of the proposed method are presented, and the theoretical formula is deduced about the relationship between the harmonic current change rate and the detuning ratio of different elements.. Thereafter, this paper proposes the criterions to identify the filter detuning, detuning components in series and in parallel of the filter, and the detuning degree. Simulation results of single-tuned and double-tuned filters show the correctness and effectiveness of the proposed method. This method can expand the original functions of the traditional filter with simple modification. It can realize the online identification of detuning components accurately and rapidly, and has good application prospect.
黄银龙, 乐健, 毛涛, 罗汉武, 刘开培. 基于谐波电流变化率的高压直流输电系统直流侧滤波器参数的在线辨识[J]. 电工技术学报, 2016, 31(6): 162-170.
Huang Yinlong, Le Jian, Mao Tao, Luo Hanwu, Liu Kaipei. The Online Parameters Identification of the DC-Side Filter of High-Voltage Direct Current System Based on Harmonic Current Change Ratio. Transactions of China Electrotechnical Society, 2016, 31(6): 162-170.
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2016, Vol. 31 
