Control Strategy Of Intermittent Renewable Generation System And Application Research

Wind energy and solar energy resource are recognized as the most ideal renewable energy. The wind energy and solar energy belong to the intermittent energy sources. Compared with the traditional energy generation system, intermittent renewable energy generation system’s output powers which are constrained by natural conditions are randomness and not follow the principle of subjective scheduling. A large number of intermittent renewable energy generation systems connected to the grid, will bring the serious adverse impacts to the stable operation of the grid. This thesis focuses on the real-time control of intermittent renewable energy generation system and coordination control with energy storage devices. Then analyze the feasibility of grid-connected intermittent renewable energy generation systems with energy storage devices access to microgrid structure. The load dynamic optimization of the allocation model in microgrid which contains grid-connected renewable energy generation systems with energy storage devices is constructed.First build the mathematical simulation model of the photovoltaic cells, Analysis of the electrical characteristics of photovoltaic cells. And then build a scheduling type of grid-connected photovoltaic generation system with energy storage devices. Combined with characteristics of the scheduling type of grid-connected photovoltaic generation system, this thesis proposes the double-duty cycle control method being used in MPPT control of the scheduling type of grid-connected photovoltaic generation system; According to the characteristic of the output of photovoltaic-Array and energy storage devices, this thesis proposes the energy management control strategy of the scheduling type of grid-connected photovoltaic generation system and study the coordination and efforts to control technology between Photovoltaic-Array and energy storage devices to make the system can maintain the relative stability of the output power and has little effect on the grid.This thesis, combining the status and development trend of the wind power development, introduces the structure and operation principle of the direct-driven permanent magnet synchronous generator of wind power system. Wind speed model, aerodynamic model of wind power system, pitch mechanism model and a mathematical model based on permanent magnet synchronous generator in the d-q rotating coordinate system are be build. This thesis proposes the control structure based on hybrid automata model of the direct-driven permanent magnet synchronous generator of wind power system, and give the controller algorithm, combining predictive control. According to the characteristic of the output of grid-connected wind generation system of Characteristics of randomness changes, this thesis proposes the energy management control strategy of the a scheduling type of grid-connected photovoltaic generation system and study the coordination and efforts to control technology between wind power system and energy storage devices to make the system can maintain the relative stability of the output power Improve the quality of the output power.According to the situation of China’s power development, build a micro-grid structure adapted to the development direction of China’s electric power. This thesis analyzes the load dynamic optimization of the allocation model in microgrid which contains grid-connected renewable energy generation systems with energy storage devices and builds the mathematical model of the minimum cost of power generation of the microgrid which are Running in the mode of island operation. Optimizing by genetic algorithm (GA), the cost of power generation within the microgrid achieve the purpose of optimal control and the minimum cost of power generation meet the load demand.