提高风电机组风能转化效率的变速控制技术研究

Study to Improve the Wind Energy Conversion Efficiency with the Variable Speed Control

摘要: 本文根据双馈式变速恒频风力发电机组工作原理、发电特性和功率优化的控制原理，建立了基于电力系统电磁暂态PSCAD软件的双馈式风力发电组、PWM变流器和模糊控制器数学模型。根据风电机组变速控制最大功率跟踪控制策略，给出了PWM变流器的网侧和电机侧变速控制算法。同时，对变速控制器中引进的模糊控制算法进行了改进，根据控制原理在PSCAD软件中设计了实现方法。仿真结果证明了实现最大功率跟踪控制方法的有效性。验证了采用优化模糊变速控制，可提高双馈式变速恒频风电机组能量转化效率10%。

Abstract: Based on the generation principle and power optimizing control principle of VSCF(variable speed constant frequency) doubly-fed wind turbine, this paper built the DFIG wind turbine, PWM converter, fuzzy variable speed controller, and other part of simulation models with software PSCAD. In the accordance with maximum power tracking principle of doubly-fed wind turbine, the converter control mode of generator side and the fuzzy control algorithm is brought in. On the basis of the fuzzy control principle, the design of the controller is completed in PSCAD. The effectiveness and feasibility of the designed method which is based on fuzzy control are demonstrated in the simulation results. It is proved that the wind energy conversion efficiency is increased by 0.1 with the variable speed control of optimization fuzzy.