不平衡电网电压下基于无模型自适应控制的WECS控制研究  

Research on WECS Control Based on Model⁃free Adaptive Control Under Unbalanced Grid Voltage

作　　者：赵晨聪 谢宙桦 周飞航 ZHAO Chencong;XIE Zhouhua;ZHOU Feihang(School of Information Engineering,Xi’an University,Xi’an 710065,Shaanxi,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,Shaanxi,China;School of Automation,Xi’an University of Posts and Telecommunications,Xi’an 710121,Shaanxi,China)

机构地区：[1]西安文理学院信息工程学院,陕西西安710065 [2]西安热工研究院有限公司,陕西西安710054 [3]西安邮电大学自动化学院,陕西西安710121

出　　处：《电气传动》2024年第10期67-75,共9页Electric Drive

基　　金：陕西省教育厅科学研究计划项目(23JK0632);陕西省自然科学基金项目(2023-JC-QN-0515)。

摘　　要：不平衡电网电压会影响风能转换系统(WECS)的正常并网运行,导致系统输出功率的波动以及输出电流的畸变。此外,在实际的永磁同步风电系统中可能会由于环境温度的变化以及检测误差等原因使得网侧电路参数存在不确定性的问题,如果参数发生改变,传统控制方法的性能将会下降。基于此,提出了一种基于灰色预测的无模型自适应控制(MFAC)方案,以缓解因电路参数不确定性导致的性能下降问题,使控制系统具有更好的抗干扰能力。此外,采用三种独立的控制方法来解决不平衡电网电压下并网输出功率的波动及电流畸变问题。仿真对比结果表明,所提控制策略不仅在电路标称参数下具有良好的静态和动态性能,而且当网侧电感参数变化时,系统的鲁棒性也得到提高,验证了所提方案的优越性。Unbalanced grid voltage will affect the normal grid connection operation of the wind energy conversion system(WECS),resulting in fluctuations in system output power and distortion of output current.In addition,in the actual permanent magnet synchronous wind power system,there may be uncertainties in the network side circuit parameters due to changes in ambient temperature and detection errors.If the parameter changes,the performance of traditional control methods will decline.Based on this,a model-free adaptive control(MFAC)scheme based on grey prediction was proposed to alleviate the performance degradation problem caused by parameter uncertainty and make the control system have better anti-interference ability.Furthermore,three independent control methods were adopted to solve the problem of grid connected output power fluctuation and current distortion under unbalanced grid voltage.The simulation results show that the proposed control strategy not only has good static and dynamic performance under nominal parameters,but also improves the robustness of the system when the grid side inductance changes,which verifies the superiority of the proposed scheme.

关 键 词：不平衡电网电压 WECS控制策略 灰色预测 MFAC方案 参数不确定性 

分 类 号：TM28[一般工业技术—材料科学与工程]