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光伏发电系统极易受外界条件的影响而出现电压波动及谐波,由于其时变、非线性、多变量的特性,仅由常规PID控制或是模糊控制调节器进行控制,存在对于跟踪指令值与抑制扰动的需求之间、稳态与动态性能之间、控制性能和鲁棒性之间的矛盾。利用动态电压补偿器消除光伏阵列的电压波动、跌落、闪变,以及电压的三相不平衡问题,并在常规PID控制的基础上,以被控对象的指令值与实际值的误差及其变化率作为输入,用模糊推理对PID的3个参数K_p、K_i、K_d进行在线自整定,以满足指令值与反馈值不断变化时误差及其变化率对控制器的不同要求。最后通过仿真证明了系统控制效果理想,动态响应速度更快,稳态误差更小,被控对象具备良好的动、静态性能。
Due to its time-varying, nonlinear and multivariable characteristics, PV power generation system is easily influenced by external conditions and is controlled only by conventional PID control or fuzzy control regulator, And the need to suppress the disturbance, the contradiction between steady-state and dynamic performance, control performance and robustness. The dynamic voltage compensator is used to eliminate the voltage fluctuation, drop, flicker and voltage imbalance of PV arrays. Based on the conventional PID control, the error of the commanded object’s actual value and its variation Rate as input, fuzzy self-tuning PID on the three parameters K_p, K_i, K_d online self-tuning to meet the changing command and feedback values of the error and its rate of change on the controller of the different requirements. Finally, the simulation results show that the system control effect is satisfactory, the dynamic response speed is faster, the steady-state error is smaller, and the controlled object has good dynamic and static performance.