含高渗透率风电的配电网暂态电压量化评估方法

Quantitative Assessment Method for Transient Voltage of Distribution Network with High-Penetration Wind Power

随着配电网中分布式风电渗透率的增加,评估影响电网暂态电压稳定性的各有关因素变得尤为重要,而评估暂态电压稳定性的现有指标在具有多暂态特性的场景下无法适用。首先介绍多二元表判据的评估思想,针对电压跌落情形,提出一种母线电压跌落安全裕度指标。其次,进一步构建母线过电压安全裕度指标,通过引入阶跃因子将两者指标有效结合,得到基于改进多二元表的母线暂态电压安全裕度指标。再次,提出区域暂态电压安全裕度指标来衡量某区域的暂态电压稳定性。最后,基于所提指标,利用Matlab/Simulink对含高渗透率风电的配电网进行仿真分析,在量化影响配电网暂态电压稳定性各因素的同时,验证了该指标的有效性和普适性。

With the further penetration of distributed wind power in the distribution network,assessing the factors affecting the transient voltage stability of the power grid becomes increasingly significant.However,the existing indexes for evaluating transient voltage stability are not applicable to scenarios with multiple transient characteristics.In this paper,the assessment idea of a multipletwo-element notation criterion is outlined.For voltage sag,a safety margin index of voltage sag of the bus is proposed.Next,a safety margin index of the overvoltage of the bus is further constructed.A step factor is introduced to combine the two indexes effectively into a safety margin index of the transient voltage of the bus based on an improved multiple-two-element notation.Then,a safety margin index of regional transient voltage is proposed to measure the transient voltage stability of a certain region.Finally,Matlab/Simulink is used to simulate the distribution network with high-penetration wind power according to the proposed indexes.The effectiveness and universality of the proposed indexes are verified while the factors affecting the transient voltage stability of the distribution network are quantified.