本文分析了其工作原理，变压器变比的确定方法，滤波能力计算方法。
The working principle, the method to calculate the ratio of transformation and algorithm of filtering capacity are also studied in this paper.
为避免谐波问题造成的电容器等设备损坏，提出了根据电容器和电抗器的滤波能力，把谐波抑制功能加入电压无功控制（VQC）装置。
To avoid device damage caused by harmonic wave, a VQC device integrating harmonic suppression function is presented in terms of the filter capability of capacitor and reactor.
仿真结果表明，基于SVD的非线性滤波算法对干扰有很强的抑制能力，较好地改善了系统的性能。
The simulation results show that the SVD-based nonlinear filtering algorithm has great interference suppression ability, and improves the performance of the system.
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