摘要
随着直驱永磁风力发电系统并网容量逐渐增加,电力系统对其低电压穿越能力也做出了明确规定,因此直驱永磁风电机组的低电压穿越算法成为近年研究热点,而算法的研究需要硬件平台的支撑。针对这个问题,构建了一套直驱永磁风力发电机组的低电压穿越试验平台。试验平台主要由模拟风力机、永磁同步电机、全功率变流器以及模拟电网组成。在模拟风力机设计时,基于直流电机的电磁转矩特性,控制其电枢电流使直流电机输出转矩实时跟踪风力机的转矩,并采用减速箱和飞轮来模拟实际风力机的低转速特性和大惯性特性。为验证试验平台的运行效果,采用了一种应用于全功率变流器的有功无功协调控制策略,在电网电压跌落时,优先向电网传输所要求的无功功率,在此基础上最大限度地向电网传输有功功率。试验结果表明:搭建的试验平台可稳定运行,在电网电压跌落至60%时,应用有功无功协调控制策略可实现低电压穿越,并使电网电压提升了11%。
The grid-connected capacity of direct-drive permanent magnet wind power generation system has been gradually increased in recent years, and the power system has made a clear regulation on the low voltage ride through capability of it. So the control method to low voltage ride through of wind turbines become a research focus in recent years, and the control method research requires a certain hardware platform. A LVRT experimental platform for direct-drive permanent magnet synchronous generator （D-PMSG） wind generation system was constructed. The experimental platform was mainly composed of a simulation wind turbine, a permanent magnet synchronous motor, a full power converter and a simulation grid. In the design of simulation wind turbine, the armature current of DC motor was controlled to make the output torque trace the torque of actual wind turbine based on the electromagnetic torque characteristic of DC motor, and gearboxes and flywheels were used to simulate the low speed characteristic and big inertia characteristic of actual wind turbine. In order to verify the performance of experimental platform, a coordinated control strategy of active power and reactive power for full power converters was applied. When the grid voltage sag,the reactive power was conveyed to the power grid preferentially. Then the active power was transported furthest. Experimental results showed that the experimental system could run stably. When the grid voltage drop to 60% , the system could realize low voltage ride through with the proposed coordinated control strategy of active power and reactive power, and the voltage had an increase of 11%.
出处
《电机与控制应用》
北大核心
2016年第12期82-88,共7页
Electric machines & control application
基金
国家级自然科学基金项目(51477027):大规模风电柔直并网系统输电能力评估与源网协调研究
关键词
直驱永磁风力发电机组
低电压穿越
模拟风力机
直流电机
全功变流器
协调控制策略
direct-drive permanent magnet synchronous generator wind generation system
low voltage ride through （LVRT）
simulation wind turbine
DC motor
full power converter
coordinated control strategy
