光伏高渗透率下配网消纳能力模拟及电压控制策略研究

随着大规模分布式光伏系统并入配电网,配网渗透率不断提高。光伏出力与负荷的不平衡导致线路中出现逆向潮流,引起电压越限。采用蒙特卡洛随机法模拟配网大规模光伏接入的情景,从单渗透率和整体两方面对模拟结果全面分析以充分评估配电网的光伏消纳能力;提出利用光伏系统逆变器的控制措施缓解并网节点的电压越限问题,进而提升配电网光伏消纳能力,通过计算电压灵敏度矩阵为所有并网逆变器分配无功补偿量,辅以有功缩减改善光伏并网特性。通过Matlab搭建IEEE33节点系统,仿真结果表明所述方法的有效性和可行性。

Simulation of Consumption Capacity and Voltage Control Strategy of Distribution Network With High Penetration of Photovoltaics

As large-scale distributed photovoltaic systems are integrated into distribution network, the distribution network penetration rate continues to increase. Imbalance between photovoltaic output and load leads to reverse power flow in the line and voltage exceeding limit. Monte Carlo random method is used to simulate the large-scale PV access scenario of the distribution network. Simulation results are comprehensively analyzed from two aspects, i.e. only penetration rate and all affecting factors, to fully evaluate PV consumption capacity of the distribution network. It is proposed to use the control measures of PV system inverters to alleviate voltage over-limit problem at grid-connection nodes. Through calculating voltage, the sensitivity matrix assigns reactive compensation to all grid-connected inverters, supplemented by active power reduction, to improve photovoltaic grid-connected characteristics. An IEEE 33-node system is built with MATLAB as simulation platform. Simulation results confirm effectiveness and feasibility of the proposed method.