微电网环内控制仿真中锁相环对垂控变换器电流畸变的影响

Eliabe Duarte Queiroz, J. I. Yutaka Ota, J. Pomilio
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引用次数: 1

摘要

交流微电网中的电网跟随变换器必须在其控制系统中包含电网同步算法,如锁相环(PLL)系统,以便能够正确地注入或吸收电力。锁相环对于保证变流器在不同电网条件下的稳定运行起着重要的作用,在具有多个变流器的微电网中,单个变流器的控制和接口无源器件之间存在相互影响,锁相环变得至关重要。而且,只要锁相环基本上是根据其与电网耦合点上的电压来估计系统相位,电网同步就会因为经过调理电路的数模转换和信号处理而产生误差。本文讨论了微电网中两个随网变流器锁相环选择的相互影响以及锁相环电压检测引入的误差的影响。给出了通过在环控制实时仿真的结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of PLL on Current Distortion of Droop-Controlled Converters in a Control-In-the-Loop Simulation of a Microgrid
A grid-following converter in ac microgrids must include grid synchronization algorithms, such as Phase-Lock Loop (PLL) systems, within its control system, so it is able to properly inject or absorb power. PLL plays an important role to guarantee the stable operation of the converter for distinct grid conditions, and it becomes critical in microgrids with multiple converters, where mutual influence among the control and the interface passive devices of individual converters exists. Moreover, as long as PLLs basically estimate the system phase from voltages on their point of coupling to the grid, the grid synchronization is subjected to errors due to the digital-to-analog conversion and signal processing through conditioning circuits. The paper proposes the discussion on the mutual effects of PLL choice in two grid-following converters in a microgrid and on the impacts of errors introduced by voltage detection of the PLL. Results from real-time simulation through Control-In-the-Loop are presented.
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