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为了提高电气化铁道电流平衡补偿装置的补偿性能,研究了常用输出滤波器的性能及改进优化方法。分析了常用LC输出滤波器的幅频和相频特性,并对比了LC(常K型滤波器)、RLC、M型和LCL输出滤波器的幅频特性,提出了在常用LC输出滤波器的滤波电容上串联电阻和电感的并联支路,它既能抑制电流平衡补偿装置与电网发生谐振,又能减小电阻上的有功损耗。从功率传输能力、瞬态电流跟踪能力、电压总谐波畸变率、谐波电流和有功损耗几方面分析了输出滤波器对电流平衡补偿装置的影响;利用满意度为综合指标的模糊优化目标函数(包括价格因数、双向功率传输能力、总谐波畸变率、谐波电流、有功功率损耗),对输出滤波器的参数进行了优化设计。仿真结果表明,经过模糊优化的参数和经验设计的参数相比,所提出的改进的输出滤波器可以更好地满足系统的补偿要求。
In order to improve the compensation performance of the electrified railway current balance compensation device, the performance of the common output filter and the improvement and optimization methods are studied. The amplitude and frequency characteristics of common LC output filter are analyzed. The amplitude-frequency characteristics of LC (Normal K-type filter), RLC, M-type and LCL output filter are compared. Filter capacitor in series resistance and inductance of the parallel branch, which can inhibit the current balance compensation device and the grid resonance, but also reduce the resistance of the active loss. The influence of the output filter on the current balance compensation device is analyzed from the aspects of power transmission capability, transient current tracking capability, voltage total harmonic distortion rate, harmonic current and active loss. By using fuzzy optimization objective function whose satisfaction is a comprehensive index (Including the price factor, bidirectional power transmission capacity, total harmonic distortion rate, harmonic current, active power loss), the output filter parameters were optimized. The simulation results show that the proposed improved output filter can better meet the compensation requirements of the system compared with those of the empirically-designed parameters.