考虑变流器无功调节特性的含高比例分布式光伏配电网电压控制方法

Voltage regulation method for a distribution network with high-penetration of distributed photovoltaic energy considering a converter’s reactive power regulation characteristics

高比例分布式光伏接入后,配电网出现潮流随光伏出力在大小和方向上随机变化的现象,造成配电网电压大幅度波动,严重情况下电压发生越限。充分利用光伏变流器及储能变流器的无功调节潜力,能够有效应对含高比例分布式光伏配电网的电压越限问题。首先,对含高比例分布式光伏配电网的电压运行特性进行分析。然后,对变流器无功电压调节特性进行分析,研究影响变流器无功调节能力的各项约束。在此基础上,提出一种考虑变流器无功调节特性的无功自响应电压控制方法,并对该方法的无功动作阈值进行了优化整定。在该方法中,变流器将就地量测电压与无功动作阈值相比较,进行无功快速动作。最后通过仿真证明了该方法能有效解决含高比例分布式光伏配电网的电压越限问题。

After a high-penetration distributed photovoltaic(DPV)energy integration into a distribution network(DN),there is a phenomenon that the power flow fluctuates randomly in magnitude and direction with DPV output.This leads to significant voltage fluctuations in DN,and in severe cases,voltage violations occur.Fully utilizing the reactive power regulation potential of DPV converters and energy storage converters can effectively address this voltage violation issue.First,the voltage operation characteristics of a DN are analyzed.Then,the reactive voltage regulation characteristics of converters and the constraints affecting their reactive regulation capability are studied.Based on these analyses,a reactive self-response voltage control method considering the reactive regulation characteristics of converters is proposed,and the reactive action threshold is optimized.In this method,converters compare locally measured voltage with the reactive action threshold to rapidly perform reactive actions.Finally,simulations demonstrate that this method can effectively solve the voltage violation problems of DN what have a high-penetration of DPV.This work is supported by the Science and Technology Project of the Headquarters of State Grid Corporation of China(No.5400-202333241A-1-1-ZN).