摘要
研究了基于永磁同步发电机的直驱式风力发电系统中PWM背靠背全功率变流器的运行特性,详细介绍了发电机侧和电网侧PWM变流器的运行状态,在数学模型的基础上给出了具体的控制策略。在Mat- lab/Simulink7.1环境下建立了系统从永磁同步发电机到电网的仿真模型,并利用S函数编写了发电机侧和电网侧变流器的控制程序,给出了系统的控制框图及仿真程序流程图。最后,在实验室搭建的17 kW直驱式风力发电实验平台上验证了系统的控制策略。仿真和实验结果都表明系统能够在不同风速下稳定运行,发电机侧输出电流近似正弦,谐波含量小;电网侧变流器在风速突变引起发电机输出功率变化的情况下能够稳定直流侧电压,输出有功和无功电流完全独立可调,并网电流质量较高。
The characteristics of back-to-back full-scale converter in direct-drive wind power system-based on PMSM（Permanent Magnetic Synchronous Machine） are researched. The operation conditions of the converters at both generator-side and grid-side are introduced and the control strategy is given based on mathematical model. A simulation model of system from PMSM to grid is built with Matlab/Simulink7.1 and the control programs are written with S-function for them. The control block diagram and simulation flowchart are provided. The control strategy is verified on the experiment platform of 17 kW wind power system in lab. Simulative and experimental results show that the system operates steadily under different wind speeds. The generator-side currents are approximately sinusoidal and the total harmonic distortion is low. The grid-side converter keeps the DC link voltage constant when the output power of the generator changes suddenly. The active and reactive powers can be decoupled and controlled separately, and the quality of grid -side currents is satisfying.
出处
《电力自动化设备》
EI
CSCD
北大核心
2009年第2期1-5,共5页
Electric Power Automation Equipment
