基于双环矢量解耦控制策略的DVR动态性能研究

Dynamic Performance of DVR Based on Dual Loop Vector Decoupling Control Strategy

在配电系统中,电网电压发生电压暂降/暂升会造成用电负荷意外停机,通常采用动态电压恢复器(DVR)对电网电压进行补偿。DVR检测单元应具有良好的动态性能以便检测电压幅度和相位的变化,以触发DVR快速补偿配电网电压波动。针对如何提高电力系统中的电能质量问题,提出了一种基于双环矢量解耦控制的DVR控制策略,用来提高DVR在补偿过程中的动态性能。试验结果表明,与传统方法相比,该控制策略可以更快地校正电压暂降,使DVR达到更好的动态性能,最终使电网电能质量得到提升。

In the distribution system,voltage sag or swell will cause unexpected power load outage.Dynamic Voltage Restorer(DVR)is usually used to compensate the grid voltage.DVR detection unit should have good dynamic performance to detect voltage amplitude and phase changes in order to trigger DVR in the rapid compensation of distribution network voltage fluctuations.In order to improve the power quality in power system,a DVR control strategy based on double loop vector decoupling control was proposed to improve the dynamic performance of DVR in compensation process.The experimental results show that the proposed control strategy can correct voltage sags more quickly than the traditional method,make DVR achieve better dynamic performance,and ultimately improve the power quality of the grid.