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。
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.
出处
《电工技术学报》
EI
CSCD
北大核心
2009年第2期114-120,共7页
Transactions of China Electrotechnical Society
基金
教育部博士学科点专项科研基金(20060280018)
上海市教委重点科研项目基金(06ZZ03)资助项目
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
Three-phase Z-source inverter, mathematical modeling, direct-drive wind power generation, direct current control
