基于双电流环控制的并网逆变器设计

Design of grid-connected inverter based on dual-loop current control

LCL滤波器可以有效抑制高次谐波,然而LCL滤波器的使用增加了系统阶数,对系统控制策略提出了更高的要求。为此,采用一种基于极点配置的电流双环控制策略,以DSP作为主控制器,充分利用DSP控制器的CLA、高精度PWM和AD等模块,使其硬件电路大大简化。最后,通过极点配置的方法选定控制参数,整个系统操作简单、控制灵活、功能强大,实现了节能降耗和精密制动。

LCL filter can attenuate the high frequency harmonics effectively.However,the LCL filter increases the orders of system,and has a higher requirements for control strategy.Hence,a method of dual-loop current control based on pole assignment is designed,it adopts the DSP as the main controller,makes full use of the CLA,high-precision PWM and AD modules of DSP controller,which greatly simplifies the hardware circuit.Finally,it selects control parameters through pole assignment.The system is simple,flexible and powerful,realizing the energy-saving and precision braking.