1、 毕业论文 题 目 无源性的变速恒频双馈风力发电机控制仿真研究 学生姓名 学 号 专业班级 指导教师 学 院 答辩日期 大学毕业论文 I 摘要 变速恒频发电技术是一种新型高效的发电技术,在风力发电领域有着良好的应用前景。本文分析了风力机运行特性及其最大风能追踪原理,对双馈电机进行数学分析,给出了功率在双馈电机中的流动图解;针对双馈 电机转子能量双向流动的要求,选择了具有能量双向流动能力的双 PWM交流励磁用变频器,研究了基于定子磁场定向的变速恒频双馈风力发电机的控制策略,实现了最大风能追踪,分析了电网不平衡条件下双馈电机的控制策略;基于 MATLAB软件建立了变速恒频双馈风力发电机组的仿真模型
2、,针对提出的控制策略对变速恒频双馈风力发电机组的并网运行特性进行了仿真研究,仿真结果表明了该控制策略的正确性和可行性。 关键词:变速恒频;风力发电;双馈发电机;双 PWM 励磁变频器 大学毕业论文 II Abstract Variablespeed constant-frequency (VSCF) operation is a new high efficient technology for power generation, which has a good future in the field of wind power generation This paper analyzed
3、the performance characteristic of wind turbine and the principle of optimum utilization of wind-energy, analyzed the mathematical model of doubly-fed induction generator(DFIG), a schematic is given about the power flow in generator It selected the dual PWM converter aimed at the demand of rotor ener
4、gy bidirectional flow, the control strategy for VSCF doublyfed wind power generator based on Stator flux orientation is proposed , realized the optimum utilization of wind-energy, analyzed the control strategy of DFIG for unbalanced supply Using MATLAB the simulation model of VSCF is built, the simu
5、lation of the interconnected performance characteristic of VSCF under the proposed control strategy is conducted Simulation results show that the proposed control strategy is reasonable and feasible KEYWORDS : Variablespeed constantfrequency, wind power generation,doubly-fed generator,dual PWM excitation frequency converter