Modeling And Controlling Simulation Study Of1.5MW Doubly-Fed Induction Wind Generator

Conventional energy resources such as coal, oil, natural gas are very limited which also produce air pollution in using, are not conducive to our environment. By the continuous using of conventional energy sources, fossil fuels are fewer and fewer, people begin to focus on the development of renewable energy. Different countries around the world have attached great importance to the development of wind energy wind. Doubly-fed induction wind generator has a good momentum of development due to its efficiency and controllability. Compared with the conventional constant speed wind turbine, the doubly-fed induction wind generator has a higher efficiency.This paper analyzes the working principle and structure of GE1.5MW DFIG, and some important operating parameters such as three main controllers-frequency/active power, voltage/reactive power and pitch angle/mechanical power and the simulation models are established in this paper too. Based on the detailed analysis of GE1.5MW DFIQ this paper presents improved control strategy for active and pitch angle controller. The first control strategy is designing power system stabilizer for DFIQ the second control strategy is using state-space method to control active power and pitch angle controller.This paper also establishes a single machine infinite bus system, two-area system and10-gen39-bus system simulation cases in TSAT (Transient Security Analysis Tool). The results show that the improved control strategy can improve the system stability and anti-disturbance capacity. In the case of three-phase short-circuit fault, the DFIG equipped with two improved control strategy has good control characteristics.