摘要
分析了三相SPWM电压型逆变器在三相静止坐标系下和两相同步旋转坐标系下的数学模型。采用了基于电压和电流的双环控制策略,针对d-q坐标下的耦合关系,提出解耦策略,并利用PI调节器提高系统的动态响应特性及跟随能力,并运用Matlab/Simulink对理论分析结论进行验证。在容性和感性负载下的验证结果表明,适当选择控制环节的PI参数,双闭环控制逆变器具有较高的可靠性和理想的动态响应能力。
The mathematical model of a three-phase SPWM voltage inverter under three-phase rest fame and two-phase rotational frames in synchronism is analyzed.The double-loop control strategy based on voltage current is adopted.For the coupling relation of d-q coordinate,the decoupling strategy is proposed.Use PI controller to improve dynamic response characteristics of the system and apply Matlab/Simulink to verify the theoretical analysis conclusion.The verified results of capacitive and inductive loads show that the double closed loop inverter is of higher reliability and ideal dynamic response if PI parameters of the control link is properly selected.
出处
《电气开关》
2011年第4期15-17,20,共4页
Electric Switchgear
关键词
电压外环
电流内环
解耦
耦合
voltage outer loop
current inner loop
decoupling
coupling
