基于协同自适应控制的光储VSG运行控制研究

Research on operation control of a photovoltaic system with storage VSG based on cooperative adaptive control

针对传统虚拟同步发电机(VSG)控制策略缺乏虚拟转动惯量和阻尼系数动态调节特性的缺点,提出一种指数型转动惯量和阻尼系数协同自适应控制策略。该策略可在VSG角速度变化率和偏离量较大时对虚拟惯量和阻尼系数进行在线调整,优化VSG转动惯量和系统阻尼动态调节特性,减少系统的超调量σ%,且缩短调节时间。首先给出VSG的并网结构、工作原理。然后建立光储VSG模型,在控制环节引入所提自适应控制策略,并分析负载突变情况下转动惯量和阻尼系数对功率、频率稳定性的影响。最后,通过仿真验证了所提策略的有效性。

There are shortcomings in the traditional Virtual Synchronous Generator(VSG)control strategy such as a lack of the virtual moment of inertia and dynamic adjustment characteristics of the damping coefficient.Thus a cooperative adaptive control strategy of the exponential moment of inertia and damping coefficient is proposed.This strategy can adjust the virtual inertia and damping coefficient online when the VSG angular velocity change rate and deviation is large,optimize the VSG moment of inertia and system damping dynamic adjustment characteristics,reduce the system overshootσ%,and shorten the adjustment time.In this paper,the grid connection structure and working principle of the VSG are given,and the optical storage VSG model is established.The proposed adaptive control strategy is introduced in the control link,and the influence of the moment of inertia and damping coefficient on the power and frequency stability under sudden load change is analyzed.Finally,the effectiveness of the proposed strategy is verified by simulation.