含高比例光伏配电网分区电压协调控制策略

Voltage Coordination Control Strategy for Zoning in DistributionNetwork with High Proportion of Photovoltaic

随着光伏接入配电网发电比例的不断增加,电压越限和波动问题越来越严重,文中提出一种配电网分区电压协调控制策略。在配电网分区方面,依据日内潮流计算得到的电压灵敏度指标信息,通过计算各节点电压受光伏有功和无功调节影响的变化量,构建适用于配电网分区的电压变化指标,以该指标满足电压变化阈值要求为判据确定各节点的区域划分;在分区电压协调控制方面,采用区内电压灵敏度控制策略,进行节点间配对并利用光伏有功无功调节能力将分区内部所有越限电压控制至正常范围,在此基础上,采用区间分布式电压协调控制策略,进行区间状态变量等效并基于交替方向乘子算法优化求解各相邻分区之间的光伏动态无功补偿量,以实现对全网电压期望波动的优化抑制。以IEEE 33节点系统为例,进行算例分析验证了所提策略的有效性。

With the increasing proportion of photovoltaic power generation connected to the distribution network,voltage out of limits and fluctuations have become increasingly serious.A voltage coordination control strategy for distribution network zoning is proposed to address this issue.In terms of distribution network zoning,based on the voltage sensitivity index information obtained from day-time power flow calculation,the voltage change index suitable for distribution network zoning is constructed by calculating the changes in the voltage of each node affected by photovoltaic active and reactive power regulation.The regional division of each node is determined based on the criterion that this index meets the voltage change threshold requirements;In terms of voltage coordination control of the zone,a voltage sensitivity control strategy within the zone is adopted to pair nodes and utilize the photovoltaic active and reactive power regulation ability to control all out of limit voltages within the zone to the normal range.Based on this,an interval distributed voltage coordination control strategy is adopted to achieve interval state variable equivalence and optimize the dynamic reactive power compensation of photovoltaic systems between adjacent zones based on the alternating direction method of multipliers(ADMM)algorithm,in order to achieve optimal suppression of expected voltage fluctuations across the entire network.Taking the IEEE 33 node system as an example,numerical analysis is conducted to verify the effectiveness of the proposed strategy.