考虑分布式电源接入的电压暂降状态估计与监测装置优化配置方法

Method for Voltage Sag State Estimation and Monitoring Device Configuration Considering DG Access

分布式电源的接入给新型电力系统电压暂降带来了新问题,对电压暂降监测装置进行优化配置是减小监测成本的有效手段。在分析分布式电源电压暂降幅值计算影响的基础上,提出基于电压暂降频次相似性系数的电压暂降状态估计方法以简化状态估计过程,以提高状态估计精度。采用蝙蝠算法(bat algorithm,BA)求解节点监测范围,并根据监测范围构造电压暂降全景可观约束,以监测成本最低、配置方案电压暂降频次相似性指标最大为优化目标,得到的配置方案在满足经济性的同时也有助于进行电压暂降状态估计。用IEEE30节点测试系统进行仿真分析,验证了所提方法的有效性。

The access of the distributed generation(GD)has brought new problems to voltage sag of the new power systems.The optimized configuration of voltage sag monitoring device is an effective means to reduce monitoring costs.On the basis of analyzing the impact of DG integration on the calculation of voltage sag amplitude,this paper proposes a voltage sag state estimation method based on the similarity coefficient of voltage sag frequency to simplify the state estimation process and improve the accuracy of state estimation.It uses the bat algorithm(BA)to solve the monitoring range of nodes and constructs a panoramic observable constraint for voltage sag according to the monitoring range,with the optimization goal of minimizing monitoring cost and maximizing the similarity index of voltage sag frequency in the configuration scheme.The configuration scheme obtained that meets the economic requirement is also helpful for voltage sag state estimation.The effectiveness of the proposed method is verified through simulation analysis using an IEEE 30 node test system.