考虑静态电压稳定性的城市电网储能优化配置研究

Research on optimal allocation of energy storage in urban power grids considering static voltage stability

伴随新能源规模化接入城市电网,电力系统逐步呈现供需时空错配形势,将导致其静态电压稳定性逐步下降,危及用电安全。为此,提出一种供需时空错配形势下计及静态电压稳定性的新型城市电网储能优化配置方法。首先,分析新能源规模化接入下城市电网供需时空错配特征,分别建立供需空间、时间错配评估指标;其次,基于输电线路潮流方程,利用一元二次方程判别式分析潮流解的个数,提出一种城市电网静态电压稳定性评估指标;然后,加权考虑上述供需时空错配及静态电压稳定性评估指标,建立储能设备优化配置模型;最后,通过仿真验证了所提方法的有效性和优越性。

As new energy sources scale up for integration into urban power grids,there is a growing spatiotemporal mismatch between supply and demand in power systems.This mismatch could gradually undermine the static voltage stability of the power systems,jeopardizing electrical safety.To counter this challenge,a novel method for the opti⁃mal allocation of energy storage in urban power grids is proposed,with a special focus on maintaining static voltage stability under a mismatch of supply and demand.The method begins with a characteristic analysis of the mismatch between supply and demand in urban power grids.Assessment indicators for the mismatch in space and time are es⁃tablished.Following this,the number of power flow solutions is analyzed using the discriminant of a quadratic equa⁃tion based on power flow equations of transmission lines,leading to the introduction of an index for assessing the static voltage stability of urban power grids.Subsequently,an optimal allocation model for energy storage devices is developed by weighting the aforementioned indicators of the spatiotemporal mismatch as well as static voltage stabil⁃ity.Lastly,the effectiveness and superiority of the proposed method are verified through simulation.