Wind power generation system and energy management control method adapted to the characteristics of small wind farms

Abstract

A wind power generation system and an energy management control method adapted to the characteristics of a small wind field. The system includes a rectifier converter, a bidirectional energy storage converter and a grid-connected inverter; the input terminal of the rectifier converter is connected to the output terminal of the fan, and the rectifier output terminal is connected to the DC side input terminal of the grid-connected inverter; the bidirectional energy storage converter One side of the bidirectional port is connected to the output terminal of the rectifier converter, and the other side is connected to the energy storage device; the grid-connected inverter is a single-phase full-bridge high-frequency grid-connected inverter; its AC side output terminal is connected to the grid. The wind power generation system proposed by the present invention includes a new rectifier converter, a new system topology and a new energy management strategy based on the state of charge of the battery, which is very suitable for small wind farm applications. The advantages of collection and high conversion efficiency have a certain reference value and guiding role in the development and research of related wind power generation technologies, and are worthy of promotion and application.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a wind power generation system and an energy management control method adapted to the characteristics of small wind farms. Background technique [0002] Wind energy, as a new type of energy, has the characteristics of huge reserves, clean and pollution-free, so it has been more and more researched and applied. At present, the most reasonable and common form of wind energy utilization is to capture wind energy through wind turbines and convert wind energy into a form of electrical energy that is easy to transmit and use, that is, wind power generation applications. Wind power generation can be divided into large, medium and small wind power generation systems according to the installed capacity of the wind power generation system. Different countries and regions have different divisions for each level of system. In my country, small wind power generation ...

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Problems solved by technology

However, the grid-connected system also faces many technical problems, such as voltage mismatch of multi-level converters, single function, lack of ability to store weak wind energy, harsh start-up conditions of existing inverters, and low conversion efficiency. Research and development still needs further development

[0004] At the same time, considering the characteristics of large wind speed fluctuations in small wind farms, generally small wind speeds, irregular changes, and limited wind energy storage, the current grid-connected systems are not targeted and highly adaptable in terms of system topology and control strategies. , usually still copy the structure and control strategy of large and medium-sized grid-connected systems, resulting in several small-scale wind power generation systems that cannot be connected to the grid normally or have low power generation efficiency and large energy waste. Therefore, the new small-scale wind power generation The characteristics of the wind farm, starting from the two aspects of the circuit topology and the system control strategy, to study the highly adaptable wind power generation system

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