直驱式风力发电系统三相Z源并网逆变器建模与控制.pdfVIP

2009 年 2 月 电 工 技 术 学 报 Vol.24 No. 2 第 24 卷第 2 期 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Feb. 2009 直驱式风力发电系统的三相Z 源 并网逆变器建模与控制 李 杰 王得利 陈国呈 宋 丹 马 炜 （上海大学上海市电站自动化技术重点实验室 上海 200072 ） 摘要 提出将新型的三相Z 源逆变器应用于直驱式风力并网发电系统中，并将传统三相PWM 并网逆变器模型和等效的Z 网络模型结合，建立了三相Z 源并网逆变器的数学模型，分析了直通 占空比改变对系统的影响，提出了在并网条件下获取稳定的Z 网络电容电压和解耦的d 、q 轴网 侧电流分量的控制策略，并给出了外环电压设定值的约束条件。实验结果证实了理论分析的正确 性和控制策略的有效性。 关键词：三相Z 源并网逆变器 数学建模 直驱式风力发电 直接电流控制 中图分类号：TM614 Modeling and Control of Three-Phase Z-Source Inverter for Direct-Drive Wind Generation System Li Jie Wang Deli Chen Guocheng Song Dan Ma Yiwei （Shanghai Key Laboratory of Power Station Automation Technology Shanghai University Shanghai 200072 China ） Abstract In this paper, the novel three-phase Z-source inverter is applied in direct-drive wind generation system. Mathematical model of three-phase Z-source inverter is proposed by combining the traditional PWM rectifier model and equivalent model of the Z-network. How variational shoot-through duty ratio affects the system is analyzed. The control method of acquiring stable Z-network capacitor voltage and decoupled d-q axis current is proposed, and constraint condition of set value of voltage loop is presented. The results of experiment on the designed prototype verify the correctness of theoretical analysis and the validity of control method. Keywords ：Three-phase Z-source inverter, mathematical modeling, direct-drive wind power generation, direct current control 恒频的运行范围受限，不利于最大风能的吸收和利 1 引言