一种微网电压不平衡下虚拟同步发电机的控制方法

Control method of virtual synchronous generator under microgrid voltage imbalance

微网发电极易造成随机能量波动,进而影响整个电力网络的可靠稳定运行。虚拟同步发电机(VSG)技术能够很好地模拟同步发电机的特性。针对微网电压不平衡状况,在同步发电机的数学模型基础上,提出一种双闭环无功电压控制器的控制方法,设计了整个虚拟同步发电机控制系统的全维观测器,观测有功功率的下垂控制系数和无功功率的变化状态,同时设计针对不同时段虚拟同步发电机电压幅值变化状态的无功电压控制器,并在MATLAB/Simulink仿真平台上,构建控制方法验证模型。结果表明,采用自调节自整定功率系数的控制方法能使虚拟同步发电机很好的发挥其特性。

The micro-grid electrode is easy to cause random energy fluctuation, which affects the reliable and stable operation of the entire power network. The virtual synchronous generator ( VSG) technology can simulate the characteristics of the synchronous generator very well. Based on the mathematical model of synchronous generator, a control method of power factor self-tuning is proposed. The full dimensional observer of the whole virtual synchronous generator control system is designed. The droop control coefficient of active power and the change state of reactive power are observed. At the same time, it designs the reactive voltage controller for the voltage amplitude change state of the virtual synchronous generator. The control method verification model is built on MATLAB/Simulink simulation platform. The results show that self- adjusting and self-tuning power coefficient is adopted. The control method enables the virtual synchronous generator to perform its characteristics well.