【摘要】 当电网发生电压跌落故障时,风力发电和光伏发电系统大规模从电网解列将对电网造成严重威胁,为测试和研究风力发电和光伏发电系统低电压穿越(LVRT)运行能力,需要电压跌落发生器(VSG)来模拟各种电网电压跌落故障。通过分析几种典型的电压跌落故障,提出了VSG的控制策略,在此基础上设计出一套经济可行、可控性高、能真实可靠模拟电网电压跌落故障的模拟实验系统,并通过实验进行了验证。更多还原

【Abstract】 When the grid voltage dip fault occurs,the large-scale wind power and photovoltaic power generation system splitting from the grid will pose a serious threat to the grid.For testing and researching into the low voltage ridethrough (LVRT) capability of the wind power and photovoltaic power system,a voltage sag generator(VSG) is needed to simulate all kinds of grid faults.By analyzing several typical voltage drop faults,a novel control strategy for VSG is proposed,and a set of simulation system to simulate grid voltage drop faults is designed,which is economically viable, high controllability and reliable.The effectiveness of the design is validated by the experimental results.更多还原