虚拟同步发电机的参数自适应控制策略研究

Research on Parameter Adaptive Control Strategy of Virtual Synchronous Generator

虚拟同步发电机(Virtual synchronous generator,VSG)通过引入转动惯量(J)与阻尼系数(D_(p))模拟同步发电机的机电特性,有效地提高了分布式电源接入电网的稳定性。由于VSG中的J和D_(p)可以动态调节,通过对VSG进行小信号模型分析,分析了J和D_(p)对系统动态性能的影响。根据功角特性曲线分析了振荡周期中J和D_(p)的整定原则,提出了一种参数自适应控制策略,建立了J和D_(p)的自适应控制函数,使VSG在功率和频率输出具有更加良好的动态性能。最后通过Matlab/Simulink搭建仿真模型进行验证,仿真结果验证了自适应控制策略的可行性。

Virtual synchronous generator(VSG)simulates the mechanical and electrical characteristics of synchronous generator by introducing the moment of inertia(J)and damping coefficient(D_(p)),which effectively improves the stability of distributed power access to the grid.Since J and D_(p) in VSG can be dynamically adjusted,the influence of J and D_(p) on the system through small signal model analysis of VSG is analyzed.Then,according to the power angle characteristic curve,the setting principle of J and D_(p) in the oscillation period is analyzed,a parameter adaptive control strategy is proposed,and the adaptive control function of J and D_(p) is established,so that the VSG has better dynamic performance in power and frequency output.Finally,a simulation model is built by Matlab/Simulink to verify the feasibility of the adaptive control strategy.