光伏电站组成结构时有变化,导致了光伏电站数学模型的时变性和非线性,基于固定参数PID控制算法的自动发电控制系统不能应对这种变化。为了提高光伏电站自动发电控制系统的调节性能,对它的控制算法进行了研究。针对光伏电站,基于波波夫超稳定理论,设计了一种离散自适应控制算法。某50 MW光伏电站,基于该算法的自动发电控制系统与基于固定参数PID算法的自动发电控制系统,对它们的控制效果进行了比较分析。仿真结果表明,基于该算法的自动发电控制系统具有优越性和可行性。
The structure of photovoltaic power plant changes from time to time, which leads to nonlinear, time-invariant charateristics of the mathematical model of the photovoltaic power plant. The automatic generation control system based on PID control algorithm with constant parameters can’t cope with them well. To improve the performance of the automatic generation control system, its control algorithm is studied. For photovoltaic plants, a discrete adaptive control algorithm is designed based on Popov superstability theory. In a 50 MW photovoltaic plant, the perfomances of the automatic generation control system based on this adaptive control algorithm and that based on PID algorithm with constant parameters are compared. The simulation proved the superiority and feasibility of the automatic generation control system based on this adaptive algorithm.