基于可变阻尼器的双馈风电机组故障穿越控制策略
Control Strategy of Fault-ride-through-based on Variable Damper in Doubly-fed Induction Generator Wind Power Generation System
作者：张军利(许昌学院 电气工程学院, 河南 许昌 461000)；张元敏(许昌学院 电气工程学院, 河南 许昌 461000)；李玉忍(西北工业大学 自动化学院, 陕西 西安 714001)
Author：ZHANG Junli(College of Electrical Eng., Xuchang Univ., Xuchang 461000, China)；ZHANG Yuanmin(College of Electrical Eng., Xuchang Univ., Xuchang 461000, China)；LI Yuren(College of Automation, Northwestern Polytechnical Univ., Xi'an 714001, China)
收稿日期：2017-08-03 年卷（期）页码：2018,50(5):209-215
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：双馈风电机组;发电;风力;电场;故障穿越;可变阻尼器
Key words：doubly-fed induction generator wind power generation system;power generation;wind power;electric power plants;fault-ride-through;based on variable damper
基金项目：国家自然科学基金资助项目（11681240380）；河南省科技攻关计划（工业领域）资助项目（182102210507）；河南省教育厅自然基金资助项目（18B470010）
中文摘要
为了解决双馈风电机组（doubly-fed induction generator wind power generation system，DFIG-WPGS）在连接点电网电压发生跌落故障时的转子过电流、改善DFIG-WPGS的故障穿越（fault-ride-through，FRT）性能等问题，提出了应用于DFIG-WPGS的可变阻尼器（based on variable damper，BVD）的控制方法。该控制方法采用基于虚拟撬棒电阻电感的负反馈控制，在DFIG转子侧引入的虚拟撬棒电阻与故障时电网电压跌落程度相关，且虚拟撬棒电阻的取值控制在合理的取值范围之内；BVD控制方法通过在DFIG转子电流控制环引入阻尼器，限制故障状态下DFIG的转子过电流，且对故障过程中的转子电流进行有效控制。连接点电网电压发生深度跌落故障时DFIG-WPGS的FRT仿真结果显示：在连接点电网电压深度跌落故障发生时刻，BVD控制方法的交流励磁电源直流侧电压的泵升幅度比矢量控制方法的更小，BVD控制方法的DFIG转子过电流幅值更小，而且故障期间转子电流的幅值比矢量控制方法的更大，更利于DFIG的功率控制；实验结果进一步验证了BVD控制方法的有效性。在改善DFIG-WPGS的FRT性能过程中，基于可变阻尼器的控制方法不仅可以有效抑制交流励磁电源的直流侧过电压、抑制DFIG转子过电流，而且可以有效控制故障过程中DFIG的输出功率，该方法在风电场具有一定的工程实践使用价值。
英文摘要
In order to solve the problems of rotor over-current and fault-ride-through (FRT) and improve the performance of the doubly-fed induction generator wind power generation system (DFIG-WPGS), the based on variable damper (BVD) strategy was proposed. The negative feedback control based on virtual crowbar resistance and inductance was used in the BVD control method. The virtual variable resistance and inductance circuit was introduced in the DFIG rotor side. The virtual variable resistance was positively related to faulty PCC voltage amplitude. In the BVD control method, a damper was introduced in DFIG rotor current control loop to limit the overcurrent. The BVD control method could effectively control the rotor current in the fault process of DFIG-WPGS.The FRT simulation results of DFIG-WPGS as deep drop fault appeared in PCC voltage were showed as follows. In the BVD control method, the DC boost voltage of the AC excitation power supply was smaller than that of the vector control method. At the moment of PCC voltage drop fault, the overcurrent amplitude of the DFIG rotor was smaller. The amplitude of the rotor current during the fault process was greater, which was more conducive to DFIG power control. The effectiveness of the BVD control method was further validated by the experimental results. While improving the FRT performance of DFIG-WPGS, the BVD control method could not only effectively suppress DC side overvoltage of the AC excitation power supply, but also suppress the DFIG rotor overcurrent. The proposed BVD control method is practical in engineering applications.
【关闭】
