含高密度光伏电源的受端电网暂态电压有理分式拟合分析

Transient Voltage Analysis for Receiving Power System With High PV Penetration Based on Rational Fraction Fitting Method

高密度的光伏发电系统从源荷端接入大型交直流混联电网,大幅度改变电网暂态响应特性,对电网的控制与运行提出了新的要求。该文提出利用有理分式拟合算法研究高密度分布式光伏电源接入对受端电网暂态电压的影响。首先,通过隐式梯形积分、Cramer法则等证明将有理分式拟合引入电网暂态分析的适用性。之后,建立含高密度分布式光伏电源的受端电网场景,对故障期间和恢复阶段的光伏出口电压值与逆变器控制参数间的关系进行有理分式拟合,验证方法的有效性。

The high level penetration of photovoltaic(PV)power generation into large-scale AC-DC power grid from the sending and receiving area significantly changes the transient response characteristics of the power grid,and puts forward new requirements for the control and operation of the power grid.In this paper,the influence of high level PV penetration on transient voltage of receiving grid was studied based on rational fraction fitting method.Firstly,the feasibility of introducing rational fraction fitting method into power grid transient analysis was proved,based on trapezoidal integration and Cramer’s rule.Then,a simulation scenario for a receiving system with high level PV penetration was established,the parametric relationship between the PV terminal voltage and the control parameters of the inverter during the fault-on and recovery stage was studied by rational fraction method,which showed the effectiveness of the proposed method.