求翻译：再次，由于PID控制器无法完全跟踪给定参考正弦波，所以本文提出了利用瞬时谐波估算法将基波电压从富含谐波的输出电压中提取出来，然后经过Park变换将基波交流量转换为直流量，然后采用PI控制就可以消除参考基波与输出基波的幅值与相位误差，最后经过反Park变换将幅值与相位控制量转换为基波控制量。是什么意思？

Again, due to the pid controller can not completely track a given reference sine wave, so the proposed use of the instantaneous harmonic estimate of the fundamental voltage from the output voltage of the harmonic-rich extracted, and then after the park transformation will be the fundamental exchange

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Again, due to PID controller cannot full track given reference sine wave, so this made has using instantaneous harmonic estimates method will fundamental voltage from rich harmonic of output voltage in the extraction out, and after Park transform will fundamental AC volume conversion for direct flow

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