摘要
三相LCL型PWM变换器存在阶次高、控制器参数设置复杂等问题,而电流控制器又是PWM变换器系统的关键。为了解决传统PI调节器在电流控制器设计当中因参数设置不当造成静、动态特性差的问题,通过合理简化电流环模型,采用一种在由PI调节器控制的电流闭环之前串联一个惯性环节的补偿控制技术,期望通过补偿后的闭环传递函数零极点相消达到减小电流超调的目的。同时,为了使电流获得快速的动态响应,基于同步旋转坐标系下动态调节时间最小原则,确定电流环控制系统自然振荡频率的分布范围,通过选取尽可能大的带宽以获得快速的动态响应。最后,通过仿真和实验结果证实了该控制技术的正确性和可行性。
Three phase LCL PWM converter has the problems of high order and complex parameter configuration.The current controller is the key of PWM converter system.In order to solve conventional PI regulator unavailable parameter caused bad static and dynamic character,a series compensated technology was proposed,which adds a inertia link in series with closed-loop current controller by simplifying the model of current controller.The method aims to reduce current overshoot by zero-pole cancellation.Meanwhile,in order to gain fast current dynamic response,determinates distributing range with natural oscillation frequency of current-loop controller based on principle of dynamic regulator time shortest in synchronous rotational frame.Finally,the superiority of the proposed control strategy is proved by the simulation and experiment results.
出处
《电气传动》
北大核心
2010年第9期33-37,共5页
Electric Drive
基金
国家自然科学基金创新群体科学基金(50721063)
国家自然科学基金(50737004
50607020)
