摘要
随着微网与分布式发电的快速发展,电网中引入了大量电力电子变换设备,但电力电子变换设备不具备传统同步发电机的惯性特性和阻尼特性,缺少阻尼和惯性,系统容易出现不能稳定运行的状况。虚拟同步电机(VSG)利用了数学建模的方式模拟了同步发电机的转动惯量和阻尼特性,是采用电力电子器件的逆变器也具有与同步发电机类似的调节特性,可以实现微网系统友好的接入电网。本文首先对虚拟同步电机(VSG)的控制策略建立模型,对算法进行理论阐述;然后分别在电网电压含有谐波与电网电压不平衡的两种工况下,分析电网异常对逆变器的运行产生的影响,并提出对应的并网电流控制策略降低影响;最后在MATLAB/Simulink中搭建逆变器仿真模型,验证所提控制策略的有效性和正确性。
With the rapid development of microgrid and distributed generation,a large number of power electronic conversion devices have been introduced into the power grid.However,power electronic conversion equipment does not have the inertial and damping characteristics,which the traditional synchronous generators have,so the system is prone to instability.The virtual synchronous generator(VSG)uses the mathematical modeling method to simulate the moment of inertia and damping characteristics of the synchronous generator.The inverter using the power electronic device also has similar regulation characteristics as the synchronous generator,and the microgrid system can be connected to the grid friendly.In this paper,the control strategy of virtual synchronous generator(VSG)is firstly modeled,and the algorithm is theoretically explained.Then,under the two conditions of grid voltage containing harmonics and grid voltage imbalance,and analyzed the impact of the influence of the conversion operation when the grid is abnormal,then the corresponding grid-connected current control strategy is proposed to reduce the impact.Finally,the inverter simulation model is built in MATLAB/Simulink to verify the validity and correctness of the proposed control strategy.
作者
丁校勇
田丰
黄耀智
戴惟
DING Xiao-yong;TIAN Feng;HUANG Yao-zhi;DAI Wei(North China University of Technology,Beijing 100144,China;State Grid Beijing Area Power Supply Company,Beijing 110000,China)
出处
《电气开关》
2020年第1期52-57,共6页
Electric Switchgear
关键词
虚拟同步发电机
电网电压谐波
电网电压不平衡
电能质量
virtual synchronous generator
grid voltage harmonics
grid voltage imbalance
power quality
作者简介
丁校勇,男,硕士研究生,主要研究方向:储能变换器控制及电能质量治理
