不平衡负载下改进光储VSG控制算法  

Improved Optical Storage VSG Control Algorithm Under Unbalanced Load

作　　者：李圣清[1] 曹鹏 李欣 LI Sheng-qing;CAO Peng;LI Xin(Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]湖南工业大学,电气与信息工程学院,湖南株洲412007 [2]湖南省光伏智能电网控制工程研究中心,湖南株洲412007

出　　处：《电力电子技术》2024年第6期80-84,共5页Power Electronics

基　　金：国家自然科学基金(51977072)。

摘　　要：这里提出了一种基于改进虚拟同步发电机(VSG)控制算法的不平衡负载储能系统优化方法,旨在提高电网输出电压稳定性。首先,建立了基于电机瞬态模型的储能系统数学模型。然后,提出了一种分序控制方案,该方案采用双二阶广义积分器(DSOGI)分离出三相电压的正序和负序分量,通过负序虚拟复阻抗技术抵消负序电流在连线阻抗上造成的电压降,从而使2倍频分量消除,避免负载三相电压失衡。通过Matlab/Simulink软件搭建相应的仿真模型,模拟光伏储能系统带不平衡负载时的运行工况,发现该算法能够使稳态过程电压不平衡度从2.7%降为0.6%,暂态过程电压不平衡度峰值从3.2%降低到2.1%,验证所提方法能够有效地优化不平衡负载储能系统的运行性能,提高微电网的电压质量。An optimization method of unbalanced load energy storage system based on improved virtual synchronous generator(VSG)control algorithm is presented to improve the stability of power grid output voltage.Firstly,the mathematical model of energy storage system based on transient motor model is established.Then,a partial sequence control scheme is proposed,in which the positive sequence and negative sequence components of the three-phase voltage are separated by a double-second-order generalized integrator(DSOGI),and the voltage drop caused by the negative sequence current on the line impedance is offset by the negative sequence virtual complex impedance technology,so that the double frequency component is eliminated and the three-phase voltage imbalance is avoided.Through Matlab/Simulink software,the corresponding simulation model is built to simulate the operating conditions of photovoltaic energy storage system with unbalanced load.It is found that the algorithm could reduce the steady-state process voltage unbalance from 2.7%to 0.6%,and the peak voltage unbalance from 3.2%to 2.1%.It is verified that the proposed method can effectively optimize the operation performance of unbalanced load energy storage system and improve the voltage quality of microgrid.

关 键 词：虚拟同步发电机 储能系统 不平衡负载 分序控制 

分 类 号：TM31[电气工程—电机]