基于最优阻尼比虚拟同步发电机的优化控制策略

针对微电网中可再生能源渗透率越来越高,微电网惯性和阻尼不足等问题越来越突出,随即一种新的控制方式即虚拟同步发电机(Virtual Synchronous Generator,VSG)技术被提出。区别于传统同步电机,虚拟同步发电机可以实时的控制电机参数获得系统稳定。文章从传统同步发电机有功控制环出发,结合功角特性曲线和频率振荡曲线分析惯性参数和阻尼系数对系统稳定性的影响。在现有控制方式的基础上提出一种基于最优阻尼比的惯性参数和阻尼系数共同自适应的控制策略。最后在Matlab/Simlink中通过离网和并网仿真分析验证所提策略的正确性和有效性,结果证明能够有效抑制系统的系统波动并具有很好的动态性能。

Optimal control strategy of virtual synchronous generator based on optimal damping ratio

In view of the increasing permeability of renewable energy in micro-grid,a new control method of virtual synchronous generator(VSG)was proposed to solve the problem of insufficient inertia and damping.Unlike the traditional synchronous motors,virtual synchronous generators can control motor parameters in real time to achieve system stability.In this paper,the influence of inertia parameters and damping coefficients on the system stability is analyzed by combining the power angle characteristic curve with frequency oscillation curve from the perspective of the traditional active power control loop of synchronous generator.Combining the existing control methods,a control strategy based on optimal damping ratio and joint adaptive inertia parameters and damping coefficients is proposed in this paper.Finally,the correctness and effectiveness of the proposed strategy were verified by off-grid and grid-connected simulation analysis in Matlab/Simlink,and the results showed that the proposed strategy could effectively suppress system fluctuations and had good dynamic performance.