不平衡电网电压下虚拟同步发电机模型预测控制  

Model Predictive Control of Virtual Synchronous Generator Under Grid Voltage Imbalance

作　　者：刘兆国 汤楠雪 张瀚超 王涛 陆星池 LIU Zhaoguo;TANG Nanxue;ZHANG Hanchao;WANG Tao;LU Xingchi(State Grid Jiangsu Electric Power Company,Xuzhou Power Supply Company,Xuzhou 221000,China;State Grid Jiangsu Electric Power Engineering Consulting Co.,Ltd.,Nanjing 210000,China)

机构地区：[1]国网江苏省电力公司徐州供电公司,江苏徐州221000 [2]国网江苏省电力工程咨询有限公司,江苏南京210000

出　　处：《电工技术》2024年第1期12-17,共6页Electric Engineering

摘　　要：虚拟同步发电机(Virtual Synchronous Generator,VSG)控制算法,可为电网提供惯性并参与电压及频率调节,但在电网电压出现不平衡时会导致并网电流不平衡及有功、无功功率波动的问题,严重影响了并网电能质量。针对此问题,提出了一种不平衡电网下VSG模型预测控制策略,通过基于快速电压矢量选择的模型预测控制策略来控制所重构的正序及负序电流分量,达到有功功率恒定、无功功率恒定及电流平衡的控制目标。此外还引入负序电流调节系数,进而实现这三个目标的协调控制。Virtual synchronous generator(VSG)control algorithm can provide inertia for the grid and assistance for voltage and frequency regulation.However,when the grid encounters voltage imbalance,it will lead to the inequilibrium of grid-connected current and the fluctuation of active and reactive power,which seriously affects the quality of grid-connected power.To solve this problem,this paper proposes a model predictive control method for virtual synchronous generator under grid voltage imbalance.The proposed control method uses a strategy based on fast voltage vector selection to control the reconstructed positive and negative sequence current components,so as to achieve the control objectives of constant active power,constant reactive power and current equilibrium.In addition,the regulation coefficient of negative sequence current is introduced,thereby realizing coordinated control of these three objectives.

关 键 词：虚拟同步发电机 不平衡电网电压 模型预测控制 功率波动抑制 负序电流 

分 类 号：TM31[电气工程—电机]