摘要
提出一种变频器并联控制方法。通过局部反馈,将变频器的并联控制解耦为变频正弦基准信号的同步控制及均流控制。首先将单台变频器的角速度积分得到的相位信息用方波表示,并在变频器模块之间交流,用于变频器的同步控制,控制各台变频器先保持同频、同相;然后采样环流信号,将其注入到正弦基准中进行均流调节,实现各台变频器的输出电流均分。搭建一套并联系统样机,由两台全数字控制变频器并联驱动一台异步电机。20～50Hz工作频率下的仿真和实验结果验证了所提出的控制算法的可行性。
A distributed parallel control of PWM inverters for AC motor drives was proposed.The control for sinusoidal reference synchronization with variable frequency and the control for load current sharing are decoupled by a local feedback.At first,the phase angle of the sinusoidal reference of each inverter was represented as a square signal and shared among the inverters,and the phase angle mentioned is pre-synchronized beyond the current sharing regulation.Then the current sharing was regulated by introducing the circulating current into the adjustment of the sinusoidal references.A prototype was built with two digital controlled inverters in parallel to feed an asynchronous motor.Simulation and experimental results under 20～50 Hz operation were given to verify the proposed control.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第24期48-53,共6页
Proceedings of the CSEE
基金
教育部高校博士点专项科研基金项目(200802871040)
电力系统及发电设备控制和仿真国家重点实验室基金(SKLD09KM09)~~
关键词
变频器
电机驱动
并联运行
同步控制
均流
inverters
motor drives
parallel operation
synchronization control
current sharing regulation
