System and method for stabilizing voltage fluctuation of wind power micro-grid employing super capacitors

Abstract

The invention discloses a method for stabilizing voltage fluctuation of a wind power micro-grid employing super capacitors, and relates to the technical fields of micro-grids and wind power generation, in particular to wind power stabilization employing the super capacitors in the wind power micro-grid. The method is mainly applied to stabilization of the voltage fluctuation in the micro-grid which is composed of a wind power system. The invention provides a detailed principle and a system structure diagram for stabilizing the voltage fluctuation of the wind power micro-grid employing the super capacitors. The system comprises a wind power generation unit, a capacitance compensation device, a super capacitor bank, a two-way direct-current / direct-current (DC / DC) converter, a voltage source inverter and a filter circuit. As a super capacitor energy storage unit and a direct-current bus interface, the structure of the boost-buck two-way DC / DC converter is analyzed; and through pulse-width modulation (PWM) control, the duty ratios of switch tubes T1 and T2 are changed, so that charge and discharge control by the super capacitors is realized; the DC / DC converter is controlled by an outer voltage loop and inner current loop double-closed loop control strategy; and meanwhile, the specific control mode of power exchange by the super capacitors is provided.

Description

technical field [0001] The invention relates to the technical fields of micro-grid and wind power generation, in particular to a system and a method thereof for a supercapacitor to stabilize the voltage fluctuation of a wind power micro-grid. Background technique [0002] Wind power has become the most competitive renewable energy due to its cleanliness and non-pollution. However, wind power is easily affected by external factors such as changes in wind speed, and the output power has volatility and randomness, which affects the reliability of wind power output, and the power quality needs to be further improved. Especially with the further increase of wind power penetration rate, the impact of wind power on microgrid cannot be ignored. Installing supporting energy storage equipment and adopting certain energy storage control strategies can effectively stabilize wind power fluctuations and improve the quality of microgrid power supply. Since the supercapacitor energy stora...

AI Technical Summary

Problems solved by technology

However, wind power is easily affected by external factors such as wind speed changes, and the output power is fluctuating and random, which affects the reliability of wind power output, and the power quality needs to be further improved

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