基于自抗扰控制技术的虚拟同步机无频差控制方法

Indifference Frequency Modulation Control of Virtual Synchronous Generator Based on Active Disturbance Rejection Control Technology

针对虚拟同步发电机处于孤岛运行时的容量低、并网惯性小、稳定性差及负荷的变化会对虚拟同步发电机产生较大的影响等问题进行研究,引入同步发电机一阶惯性环节,设计了虚拟同步发电机的控制方案和数学模型。在传统下垂控制策略的基础上,采用一种基于自抗扰控制(active disturbance rejection control,ADRC)技术的虚拟机无差调频控制策略。在PSCAD/EMTDC仿真平台上,通过与传统比例-积分控制效果进行对比,在有功负荷发生波动情况下,所采用的控制策略不仅能做到无差调频,而且控制精度更高。

This paper studies problems of the virtual synchronous generator such as low capacity , small grid-connection inertia , poor stability and great impact on the generator by load variation under the island operation mod.. It introduces firsthe generator and designs control scheme andmathematical model for the virtual synchronous generato. On the basis of traditional droop control strategy , it adopts a kind of indifference frequency modulation control strategy based on active disturbance rejection control （ ADRC） technology. On PSCAD/EMTDC simulation platform , it compares control effect of tional PI control effett and discovers that under the condition of active load fluctuation , the proposed realle indifference frequencymodulation but also has higher control accuracy.