基于模型解析双馈感应发电机低电压穿越仿真  

Simulation of Low Voltage Ride through for Doubly Fed Induction Generator Based on Model Analysis

作　　者：张思旭 顾菊平[1] 朱建红[1] 冒琳鑫 ZHANG Si-xu;GU Ju-ping;ZHU Jian-hong;MAO Lin-xin(Institute of Electrical Engineering,Nantong University,Nantong Jiangsu 226019,China)

机构地区：[1]南通大学电气工程学院,江苏南通226019

出　　处：《计算机仿真》2024年第9期72-78,469,共8页Computer Simulation

基　　金：国家自然科学基金(U2066203);江苏省高等学校自然科学研究重大项目(BE2021063)。

摘　　要：针对电网电压不对称跌落双馈感应发电机转子侧变流器过电流问题,根据正反旋转同步坐标系下双馈感应发电机数学模型与暂态参数解析,推导出转子正负序同等电压变化下正序电流变化量远大于负序,且双馈感应发电机发出的定子无功功率与转子正序无功电流成正相关结论,提出了一种兼顾转子电流与电网无功支持的不对称低电压穿越控制策略。穿越期间模型自动动态求解,合理分配转子电压,转子故障电流控制在在安全范围。策略可行性通过MATLAB/Simulink仿真验证,电压跌落80%时,控制转子电流同时向电网提供最大无功支持,帮助电网电网电压恢复,所提出的控制策略可在一定程度提升双馈感应发电机的低电压穿越能力。In response to the problem of overcurrent in the rotor side converter of a doubly fed induction generator caused by asymmetric voltage drop in the power grid,based on the mathematical model and transient parameter analysis of the doubly fed induction generator in a synchronous coordinate system with forward and reverse rotation,it is derived that the change in positive sequence current is much greater than that in negative sequence under the same voltage change in the rotor positive and negative sequence,and the stator reactive power generated by the doubly fed induction generator is positively correlated with the rotor positive sequence reactive current.A asymmetric low-voltage ride through control strategy that balances rotor current and grid reactive power support is proposed.The model is automatically and dynamically solved during the ride through period to reasonably distribute the rotor voltage and control the rotor fault current within the safe range.Finally,the feasibility of the strategy is verified by MATLAB/Simulink.When the voltage drops by 80%,the rotor current is controlled to provide maximum reactive power support to the power grid at the same time to help the power grid voltage recover.The proposed control strategy improves the low voltage ride-through capability of DFIG to a certain extent.

关 键 词：电网电压不对称跌落 电流 无功支持 低电压穿越 

分 类 号：TM614[电气工程—电力系统及自动化]