Power Control Strategy Of Wind/solar Hybrid Based On Micro-grid

Wind and solar energy has been widely used. however, due to the wind and solar power are greatly affected by environmental changes, the limitations are exposed when applied, due to the wind and solar energy have natural complementarity, wind and solar hybrid systems can take advantage of this natural complementarity, so wind and solar hybrid systems are studying in this paper.The systems principles and programs of wind/solar hybrid system are analyzing on this paper, Analysis of the power balance of the entire system from the perspective of the power control, research the power control algorithm and power control algorithm research, this paper’s work content from the following aspects:First, two kinds of wind/solar hybrid structure are analyzed and compared based on micro-grid, the structure based on the DC bus in parallel is proposed, and micro-source characteristics of the system are modeling and analysis; MPPT and power control are based on this structure and model;Next, wind and solar maximum power point tracking algorithm and analysis, several commonly used MPPT control algorithms are analyzed, and compare its advantages and disadvantages, and propose a new control method.Then focus on the method of power control strategies, analyze the operation principle and method based on DC bus voltage, and analyze the control method on GRID-connect and island state, put the emphasis on power control method of GRID-connect state, and power balance control method based on DC bus voltage;Finally, we use the simulink toolbox of matlab complete wind/solar hybrid system simulation model based on DC bus structure, simulate the maximum power tracking of photovoltaic and wind power generation systems separately, the system can track the maximum power point effectively; and simulate the integrated system on GRID-connect and island state based on DC bus structure, and analyze its output power, input power,battery charge power and DC bus voltage waveforms based on the power control algorithm, then Build a system platform.