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A Three-Phase PLL Algorithm Based on Signal Reforming Under Distorted Grid Conditions

机译:电网失真条件下基于信号重构的三相PLL算法

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摘要

This paper proposes a novel three-phase phase-locked loop (PLL) algorithm, which focuses on the reforming of the primary signals before grid synchronization rather than improving the phase estimation methodologies. The unbalanced signals are reformed to balanced ones without damage to the phase angle, through which the negative sequence of the grid voltages is removed. This eliminates the estimation errors of conventional synchronous reference frame PLL and enhances its response speed with a higher bandwidth. The reforming process is supposed to be carried out at every zero-crossing point of the three-phase voltages and choose one phase as reference to balance the other two. Coefficients for the signal reforming are calculated at one zero-crossing point and updated until the next comes. In implementation, a certain phase is chosen as the reference all along and the reforming process will be suspended when it just crosses the zero line. This PLL algorithm has a fast and precise character to reform the three-phase grid voltages and is flexible for application. Under heavily distorted grid conditions, it can still perform effectively even with multiple zero-crossings. Comprehensive experimental results from a digital signal processor-based laboratory prototype are provided to validate the performance of this PLL algorithm.
机译:本文提出了一种新颖的三相锁相环(PLL)算法,该算法着重于电网同步之前对原始信号的改造,而不是改进相位估计方法。将不平衡信号重组成平衡信号,而不会损坏相角,从而消除电网电压的负序。这消除了常规同步参考帧PLL的估计误差,并以更高的带宽提高了其响应速度。该重整过程应该在三相电压的每个零交叉点处进行,并选择一个相作为参考来平衡其他两个相。在一个零交叉点计算信号重整系数,并更新直到下一个零点出现。在实施中,始终选择某个阶段作为参考,并且当重整过程刚过零线时将暂停重整过程。该PLL算法具有快速精确的特性,可以重整三相电网电压,并且应用灵活。在严重失真的网格条件下,即使有多个零交叉,它仍然可以有效执行。提供了来自基于数字信号处理器的实验室原型的综合实验结果,以验证该PLL算法的性能。

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