大型光伏储能电站与同步发电机励磁的非线性协调控制策略

Nonlinear coordinated control strategy of large-scale photovoltaic power station with energy storage and synchronous generator excitation

在大规模光伏储能电站接入系统的容量和比重不断增加的情况下,光伏电站应具备一定的电压和功率调节能力来支撑电网的稳定运行。以大型光伏储能电站接入的多机电力系统为研究对象,推导其微分代数系统结构模型,提出了采用光伏储能电站逆变器与同步发电机励磁协调来提高系统稳定水平的非线性控制策略。该策略避免了不同控制器单独设计造成的配合不协调问题,同时可以对电压和有功等多个目标量进行控制。由于采用非线性设计方法,控制器可在大范围适用而不局限于设计点附近。仿真结果表明,所设计的控制器可以有效提高系统的电压和功率调节能力,保障系统安全稳定运行。

With the capacity and proportion of large-scale photovoltaic power station with energy storage integrated to system increasing,the photovoltaic power station should have certain voltage and power regulation ability to support the stable operation of the grid. The model of differential algebraic system for largescale photovoltaic power station with energy storage integrated to multi-machine power system is deduced,and a nonlinear coordinated control strategy is proposed to improve the stability level of the system by using the coordination of inverters for photovoltaic power station with energy storage and synchronous generator excitation. The strategy avoids the improper coordination caused by the separate design of different controllers,and can control multiple indicators such as voltage and active power. Due to the application of nonlinear design methods,the controller can be applied in a wide range and not limited to the vicinity of the design point. The simulative results show that the designed controller can effectively improve the voltage and power regulation ability of the system and ensure the safe and stable operation of the system.