摘要
逆变器双环控制策略易受到干扰,导致控制效果较差,为此提出了微网光伏双模式逆变器双环控制策略。首先分析微网光伏双模式逆变器运行流程,采用电容电流内环、电压外环的双环控制策略,保证逆变器输出电压稳定性,通过电压外环控制器与电流内环控制器的传递函数获取电容电流内环、电压外环的双环控制逆变器传递函数和闭环传递函数,通过极点配置法设计双环控制器参数,最终获取双环控制系统期望特征,实现微网光伏双模式逆变器的双环控制。实验结果表明,所提方法可有效控制微网光伏双模式逆变器,微网光伏双模式逆变器输出电压误差小。
The inverter double-loop control strategy improves the defect that the previous voltage single-loop control of the inverter is susceptible to interference and leads to poor control effect. The micro-grid photovoltaic dual-mode inverter dual-loop control strategy is proposed, the micro-grid photovoltaic dual-mode inverter’s composition and operation process is analyzed, based on the above analysis, select the dual-loop control strategy of the capacitor current inner loop and voltage outer loop to ensure the inverter output voltage stability. Using the transfer function of the voltage outer-loop controller and the current inner-loop controller, the double-loop control inverter transfer function of the capacitor-current inner-loop voltage outer-loop is obtained. Using the closedloop expected pole formula of the third-order control system, the closed-loop transfer function of the dual-loop controller is represented. The parameters of the dual-loop controller are designed by using the pole configuration method. Finally, the expected characteristic formula of the dual-loop control system is obtained to realize the dualloop control of the micro-grid photovoltaic dual-mode inverter. The experimental results show that the micro-grid photovoltaic dual-mode inverter can be effectively controlled by this method, and the output voltage error of the micro-grid photovoltaic dual-mode inverter controlled by this method is only about 0.5%.
作者
闫根弟
YAN Gendi(Taiyuan Institute of Technology,Taiyuan 030008,China)
出处
《电气应用》
2020年第3期55-59,共5页
Electrotechnical Application
关键词
微网光伏
双模式
逆变器双环
控制策略
micro-grid photovoltaic
dual-mode
inverter dual-loop
control strategy
