Research On Power Smoothing Control Strategy Of Double-fed Wind Turbine Generator

With the continuous growth of new energy efficiency, wind power attract more and more people’s attention. Due to the unpredictability and the random fluctuations or the other characteristics of the wind speed, the wind turbine generation system will produce a corresponding fluctuant output power. With the large-scale wind power mergered into the grid, the output power fluctuations may affect the quality of the grid electricity, seriously, it may also lead to devastating injury of the grid. So, how to make the wind turbine output power more smoothly become a hot research gradually.This paper describes the operation and the control strategy of double-fed wind turbine first, including the principle operated mode, operating characteristics and maximum power point tracking control strategy of wind turbine. These all can lay a good foundation for the development of control strategy and creation of the real-time simulation platform.Based on the research of output power smooth control strategy existed and shortcomings of traditional control strategies of the doubly-fed wind turbine, we develop a new smooth power control strategy that coordinated the kinetic energy control with the rotor pitch control.For a single wind turbine, we develop a semi-physical real-time simulation platform in the laboratory. This simulation platform can complete precise modeling of single wind turbine machine, including controllers and models of mechanical parts of the wind turbine. In this simulation platform, each part tends to modularity, easy to expansion and migration. There are a good man-machine interface and enough I/O interface. It can be used to develop and validate control algorithms quickly, also, it can save the cost of testing, improve the safety of operation and optimize the control strategy.The new control algorithm is used in the simulation platform, by this, we carry a real-time, comprehensive, closed-loop test in the laboratory. Compared with the traditional control strategy, the effectiveness of the new smooth control strategy is proved.