光伏微网中虚拟同步发电机参数自适应控制策略  

Adaptive Control Strategy of VSG Parameters in Photovoltaic Microgrid

作　　者：殷桂梁[1] 董浩 代亚超 王海轮 王硕[1] YIN Guiliang;DONG Hao;DAI Yachao;WANG Hailun;WANG Shuo(School of Electrical Engineering,Yanshan University,Qinhuangdao 066004,Hebei Province,China)

机构地区：[1]燕山大学电气工程学院

出　　处：《电网技术》2020年第1期192-199,共8页Power System Technology

基　　金：国家自然科学基金项目(51477147);河北省自然科学基金项目(E2018203358)~~

摘　　要：当太阳能大规模接入光伏微电网时,系统的惯性将会随之减少,从而导致系统在遭到扰动后可能会出现严重的频率振荡问题。针对该问题,提出了一种新的虚拟同步发电机控制策略,可有效增强系统惯性。该策略通过构建虚拟惯量和阻尼与频率偏移量间的自适应关系,使得系统可根据其暂态过程中不同阶段的系统特性来自由配置虚拟惯量和阻尼系数。相较于传统控制策略,该控制策略可使得系统在相同负荷扰动下受到的冲击减小,从而减小了系统在振荡过程中的超调量和振荡时间,有效提高了光伏系统的动态稳定性。其次,该文对系统关键参数的选取范围进行了详细分析,并利用根轨迹法确定各个参数的最优值。最后利用Mtalab/Simulink仿真工具,通过与传统控制策略相对比验证了文中新的虚拟同步发电机控制策略的有效性和优越性。When solar energy is integrated into photovoltaic microgrid in large scale,the inertia of the system is reduced.This may cause severe oscillations in the system after being disturbed.In order to solve this problem,this paper proposes a new virtual synchronous generator(VSG)control strategy,able to effectively enhance the system inertia.By constructing an adaptive relationship between virtual inertia and damping and frequency offset,the new strategy allows the system to configure the virtual inertia and damping coefficient according to the system characteristics in different stages of its transient process.Compared with traditional control strategy,the control strategy can reduce the impact of the system under the same load disturbance,thereby reducing the overshoot and oscillation time of the system during the oscillation process,and effectively improving the dynamic stability of the photovoltaic system.Furthermore,this paper analyzes the selection range of the key parameters of the system in detail,and uses root locus method to determine the optimal selection value of each parameter.Finally,with Matlab/Simulink simulation tool,effectiveness and superiority of the new VSG control strategy are verified by comparing with traditional control strategies.

关 键 词：虚拟同步发电机 虚拟惯量 虚拟阻尼 自适应控制策略 频率振荡 

分 类 号：TM721[电气工程—电力系统及自动化]