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电气化铁道牵引机车的单相非线性,导致供电系统含有大量负序、谐波及无功电流。基于有源滤波器补偿的电气化铁道牵引供电系统,关键是补偿电流的检测。检测方法影响补偿的内容及结果的精确性及实时性。根据瞬时无功功率理论,提出一种能综合补偿电气化铁道牵引供电系统负序、谐波和无功电流的检测方法。该方法通过无延时的两相虚拟,不存在相序延迟,能检测出系统中含有的谐波及无功电流,通过平衡变换原理,能检测出负序电流。同时该检测方法的应用不受平衡变压器限制。通过综合补偿理论分析和仿真结果证明,该检测方法具有实时性好、检测精度高的特点。
The single-phase nonlinearity of electrified railway traction locomotives causes the power supply system to contain a large amount of negative sequence, harmonics and reactive current. Based on the active filter compensation of electrified railway traction power supply system, the key is to compensate the current detection. Detection methods affect the content of compensation and the results of the accuracy and real-time. According to the theory of instantaneous reactive power, a new method to detect the negative sequence, harmonic and reactive current of electrified railway traction power supply system is proposed. The proposed method can detect harmonics and reactive current contained in the system through phase-free delay without phase delay, and can detect negative sequence current through the principle of balanced transformation. At the same time the application of the detection method is not limited by the balance transformer. Through comprehensive compensation theory analysis and simulation results show that the detection method has the characteristics of good real-time, high detection accuracy.