一种虚拟同步发电机自适应阻尼补偿方法

针对系统电感对虚拟同步发电机控制系统存在等效负阻尼效应的问题,提出了一种自适应阻尼补偿方法。首先,基于虚拟同步发电机控制技术,通过dq变换和小信号分析建立系统的动态电磁方程和动态小信号模型。然后利用电磁转矩偏差分解出同步力矩系数和等效阻尼系数。最后根据等效负阻尼的产生机制,在有功-频率调节器中加入以系统频率、虚拟阻抗为自适应控制变量的阻尼补偿模块,实现对虚拟同步发电机阻尼的自适应补偿。通过Matlab/Simulink仿真,并与基于传统的虚拟同步发电机控制方法及基于虚拟阻抗补偿方法等方法所获得的结果进行比较,表明文章所提出的自适应阻尼补偿方法具有更强的稳定性和更快的响应速度,验证了方法的有效性。

An adaptive damping compensation method for virtual synchronous generators

To solve the problem that the system inductance has the equivalent negative damping effect on the virtual synchronous generator control system, an adaptive damping compensation method is proposed in this paper. Firstly, based on the virtual synchronous generator control technology, the dynamic electromagnetic equation and dynamic small signal model of the system are established through DQ transformation and small signal analysis. Then the synchronous moment coefficient and equivalent damping coefficient are decomposed by electromagnetic torque deviation. Finally, according to the analysis of the generation mechanism of equivalent negative damping, a damping compensation module with system frequency and virtual impedance as adaptive control variables is added to the active power frequency regulator to realize the adaptive compensation for the damping of virtual synchronous generator. Through Matlab/Simulink simulation,a comparison of the results obtained by the proposed method with the results obtained by the traditional virtual synchronous generator control method and the virtual impedance compensation method is made, and shows that the adaptive damping compensation method proposed in this paper has stronger stability and faster response speed, thus verifying the effectiveness of the method.