Wide-range voltage input conversion device and method for grid connection of distributed power supply

Abstract

The invention provides a wide-range voltage input conversion device and method for grid connection of a distributed power supply and relates to the technical field of power system control. The wide-range voltage input conversion device comprises a microprocessor unit, a full-bridge high-frequency array unit, a composite buffer protection unit, a power frequency conversion unit, an MOSFET / IGBT drive unit, a voltage detection unit, a current detection unit, a wireless communication unit, an LC filter and an upper computer, wherein the MOSFET / IGBT drive unit is driven to control on / off of an MOSFET and an IGBT through current processed by the microprocessor unit and current and voltage information collected by the voltage detection unit, and meanwhile, the collected current and voltage information is transmitted to the upper computer. The voltage input range of grid connection of the distributed power supply can be expanded, the grid connection output power level is classified, the influence of voltage fluctuation caused by an environment or other factors on a distributed power generation system is avoided, the requirements on output grid connection power in different environments are met, and the wide-range voltage input conversion device has the function of strengthening man-machine conversation.

Description

technical field [0001] The invention relates to the technical field of power system control, in particular to a wide-range voltage input conversion device and method for distributed power grid connection. Background technique [0002] With the increasing energy consumption, non-renewable fossil fuels will eventually be exhausted, so green and clean energy such as wind power, photovoltaic power generation, and fuel cells have been rapidly developed. As an effective way to connect clean energy to the grid, distributed power generation technology has attracted more and more attention. Due to the regulation method of the distributed power generation system and the inherent characteristics of its own structure, the input energy of the distributed power generation system using wind energy, solar energy, etc. has natural fluctuations. Therefore, the output power of the distributed power generation fluctuates greatly, and its output voltage is mostly in a very large range. Changes ...

AI Technical Summary

Problems solved by technology

Due to the regulation method of the distributed power generation system and the inherent characteristics of its own structure, the input energy of the distributed power generation system using wind energy, solar energy, etc. has natural fluctuations. Therefore, the output power of the distributed power generation fluctuates greatly, and its output voltage is mostly in a very large range. Changes in a wide range, high degree of uncertainty, easy to cause flicker caused by grid voltage fluctuations, and the distributed power generation system cannot classify the output power through relevant measures. Therefore, for the voltage input range of the distributed power generation system and Multi-terminal output power class classification puts forward higher requirements

At present, the distributed power generation system mainly uses the Boost-Buck buck circuit to improve the measures for widening the input voltage range of the distributed power supply. When it comes to the improvement of the power level, components with extremely high power levels are often required. The Boost-Buck buck circuit Inherent device characteristics limit the voltage input range and power class classification of distributed generation systems

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