一种改进型单周控制的交流电子负载研究

为了克服交流电子负载中单周控制技术负载稳态和瞬态抑制能力较弱的问题,提出主电路整流器采用单极性调制、控制器采用改进的带斜坡补偿的单周控制技术与比例积分(PI)技术相结合的方式.通过PI调节器参数可按照实际情况进行调整,减少元件非理想性带来的稳态误差,增大负载调整范围,提高系统的动态特性.应用上述方案设计1kVA交流电子负载实验样机.实验结果表明,该方案简单易行,能够较好地实现单相测试电源的各种阻抗特性模拟.

Research on Improved One-cycle Control AC Electronic Load

To overcome the problem that the regulation performance on steady and/or transient of one–cycle control load regulation is poor in AC electronic load,this paper proposes a scheme that the rectifier in power circuit employs a unipolarity modulation,and the controller has the technical mode of improved one-cycle control with slope compensation combined with proportional integral（PI）.By regulating the parameter of PI regulator in terms of various case,it reduces the steady error due to elements’nonlinearity,increases the adjustment range of the load and improve the dynamic characteristics.And it employs the proposed scheme to design an experimental prototype of 1kVAAC electronic load.Experimental results show that the scheme is simple and easily implemented,realizing the simulation of various impedance characteristics of single phase test power well.