Dual Power Supply System Of Wind Energy Distribution And Control System

With the gradual depletion of petrochemical resources and the growing emphasis on environmental protection, people are increasingly aware of the importance of saving energy and using clean, renewable energy. Under this circumstance, the main problem which large electricity consumer such as oil field have to face is how to increase efficiency and reduce cost. Therefore, energy saving is significant for them. The electric submersible pump and oil pumping unit are main power-consuming equipment, so reducing the electricity consumption of production equipment is essential. As a clean renewable energy, wind power with huge reserve is promising. However, because of the instability of wind speed, it cannot provide reliable electricity for the load in wind power generation. In order to solve this problem, the traditional method is to use electricity from supply network when the wind power is not stable, but the wind power is in low usage. The aim of this thesis is to directly apply wind power into equipment. Design a dependable controller and automatically adjust load proportion brought by wind power and net supply for the purpose of saving energy and improving efficiency.The innovation of the thesis is to to implement real-time control of network voltage by designing a controller to make the coordination between wind power and network better. The main contents of this thesis are as follows:(1) Research on the principle and designed method of three-phases voltage type PWM rectifier. The related knowledge such as PWM rectifier’s basic structure, characteristics and classifications, rectifier principle, the principle of coordinate transformation and so on are introduced. And then a simulation model of three phase voltage type PWM rectifier model is built in MATLAB.(2) Research on the algorithm of SVPWM rectifier. A simulation model of SVPWM is built in MATLAB and the principle of the SVPWM rectifier is verified by simulation.(3) A wind generator model is built in MATLAB by using a synchronous generator model. The track towards the network side is realized through designing input reference voltage controller. And then analyze energy distribution of duplicate supply system according to simulation results. Power complementary between network and wind side at various wind speed is accomplished by controlling rectifier’s switch to make the load operating on good condition. Traditional methods which use network power supply to replace wind power supply result in low usage of wind energy. This thesis makes wind side and network side in parallel connection to directly drive load and prevent fluctuation of voltage on wind side by regulating voltage on network side. So load can operate normally without cutting wind energy. The simulation results show the efficiency and practicability of this new method.