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| 摘要: |
| 当前主流的风力发电系统采用"双馈电机 双PWM变流器"的变流技术,但存在效率低、控制复杂的问题。采用六相低速永磁同步发电机代替双馈发电机,变流器采用"不控整流 升压斩波 SPWM逆变"变流技术。六相不可控的二极管整流器对低速永磁发电机发出的交流电进行12脉波整流,这种不可控的整流方式增加了系统可靠性,简化了控制系统;采用升压斩波电路进行升压,以降低系统对电机输出电压的限制,拓宽风机的工作范围,同时将2个升压斩波电路并联,以降低单个电抗器和IGBT器件通过的电流;逆变器采用2个三相桥式PWM逆变器并联方式,在最佳风能捕获(MPPT)算法和逆变器数学模型的基础上,采用直接电流控制对逆变器进行输出控制。用PSIM软件进行了建模和仿真,仿真结果证实设计的正确性。 |
| 关键词: 风力发电,永磁直驱,不控整流,升压斩波,SPWM逆变器,直接电流控制 |
| DOI： |
| 分类号:TM614 |
| 基金项目: |
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| Research on power conversion technique in MW-level direct-driven wind turbine |
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xu Feng WANG Hui YANG Tao-yi
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| Abstract: |
| "Double-fed generator double-PWM converter" is widely used in wind power generation system currently,which has low efficiency and complex control technology.It is suggested to replace the double-fed generator by the six-phase low-speed permanent-magnet generator,and to use "uncontrollable rectifier Boost chopper SPWM converter" in converter system.Six-phase uncon-trollable rectifier commutes AC produced by generator in 12 pulses,which enhances the system reliability and simplifies the control;two paralleled Boost chopper circuits are used to boost voltage and extend the work region of generator,as well as to reduce the current through the reactor and IGBT.Based on MPPT(Maximum Power Point Tracking) arithmetic and converter model,the output of two parallel 3-phase-bridge PWM inverters is controlled directly by direct current.The model of whole converter system is built with PSIM and simulative results verify its correctness. |
| Key words: wind power generation,permanent-magnet direct-driven,uncontrollable rectifier,Boost chopper,SPWM inverter,direct-current control |
