基于双脉宽调制变换器和电压滞环控制的电能质量信号发生装置

介绍了基于双脉宽调制(PWM)变换器的电能质量信号发生装置的结构及其工作原理;该装置采用控制简单、易于实现、鲁棒性强的电压滞环控制方式产生输出电压信号;对于存在电压突变的信号,通过引入微分负反馈来增强控制系统的快速性和稳定性,并抑制输出电压的超调量;建立了由交流接触器作为被测试设备的测试系统.仿真结果表明,该电能质量信号发生装置具有良好的动态性能和较高的控制精度,能够产生各种电能质量信号波形;可与其他设备共同构成电能质量测试系统.

DUAL PWM CONVERTER AND VOLTAGE HYSTERESIS CONTROL BASED POWER QUALITY SIGNAL GENERATOR

The principle and structure of dual pulse width modulation (PWM) converter based power quality signal generator, in which the voltage hysteresis control is applied, are presented. The hysteresis control strategy possesses such advantages as simplicity of control, easy to realize and high robustness. For the signal containing abrupt change of voltage, by means of bringing in differential negative feedback the respond speed of the presented signal generator can be improved, its stability can be enhanced and the overshoot phenomenon of output voltage can be eliminated. The authors build up a testing system in which the AC contactor is used as the equipments to be tested. Simulation results show that the presented signal generator possesses good dynamic performance and higher control accuracy, various power quality waveforms can be generated by this generator and it can be used to compose power quality testing system with other devices.