The test platform of actual electrical machines and their associated mechanical loads can be replaced by the motor emulator system based on inverters. The system is convenient for the tests of frequency conversion driving and provides guidance for control optimization. Fitting mechanical load model is a key technology of the system ,in order to simulate asynchronous motors and their loads,a current closed-loop vector control strategy based on virtual rotor flux orientation was proposed. The control strategy adapts to arbitrary input voltage and guarantees the speed and accuracy of port current tracking. Moreover,it meets the requirements of the relationship between voltage and current of the motor emulator in both steady and transient state. No-load starting,sudden loading and three phase unbalance of induction motor had been simulated,and the results of simulation verifiy the validity and feasibility of the scheme.%基于逆变器的异步电机及负载模拟系统可取代实际电机和负载实验平台,在便于变频驱动系统实验的同时,可为控制优化提供指导.该系统的电机负载模型的拟合控制是关键技术之一,针对异步电机及其负载的模拟,提出一种基于虚拟转子磁链定向的电流闭环矢量控制策略.该策略可适应端口输入电压的任意变化,并保证模型电流跟踪的快速性和准确性,满足电机模拟器的稳态和瞬态电压电流外特性关系要求.对电机的空载启动、突加负载和电源三相不平衡3种典型工况进行了仿真,结果验证了所提方案的正确性和可行性.
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