摘要
无刷双馈发电机没有电刷和滑环,故障率低,在风力发电系统中有良好的应用前景,但其采用直接转矩控制(DTC),在低转速下运行时转矩脉动较大,不利于系统稳定运行。文章提出一种改进的模糊直接转矩控制策略,在控制输入中增加了转矩误差的变化率,从而改进了模糊规则表中低速运行区的控制算法。同时,将离散空间电压矢量调制(DSVM)技术引入到直接转矩控制系统中,增加了可供选择的空间电压矢量。在MATLAB/Simulink中搭建了无刷双馈风力发电系统模型,并在渐变风和随机风两种工况下进行了动态仿真。仿真结果表明,在低风速运行时转矩无明显波动,在两种工况下该系统都能稳定运行,并快速地跟随风速的变化,该控制策提高了系统的稳定性和鲁棒性。
Brushless Doubly-Fed Generator （BDFG）has good potential for application in wind power generation system because of lower failure rate from no brushes and slip rings, but when Direct Torque Control （DTC）is applied, the torque ripple is large, which causes harm to the stability of the system. An improved DTC strategy is proposed based on fuzzy control rules in this paper. The strategy adds a change rate of torque error to the inputs, then improves the fuzzy control rules at low speed operating zone. Meanwhile,Discrete Space Vector Modulation （DSVM）technology is introduced to increase the number of optional space voltage vectors. In the end, a model of wind power generation system with BD- FG is built in MATLAB/Simulink, and the system is simulated respectively in a condition of wind changes gradually and random wind condition. The simulation result shows that the torque ripple in low speed zone is very small, and the system can keep stable and track wind quickly. The result proves that the control strategy can improve the stability and robustness of the system.
出处
《可再生能源》
CAS
北大核心
2013年第4期55-59,共5页
Renewable Energy Resources
基金
国家自然科学基金资助项目(5120795)
辽宁省自然科学基金资助项目(201202170)
辽宁省科技攻关计划项目(2011220017)
关键词
无刷双馈发电机
风力发电系统
直接转矩控制
模糊控制
离散空间电压矢量调制
转矩脉动
brushless doubly-fed generator
wind power generation system
direct torque control
fuzzy control
discrete space voltage vector modulation
torque ripple
