DC micro-grid consistency sliding mode control method including bus voltage compensation and power distribution

Abstract

A DC micro-grid consistency sliding mode control method including bus voltage compensation and power distribution comprises: firstly, constructing an independently-operating DC micro-grid system, comprising an environment-friendly low-carbon power generation distributed power supply, an energy storage system and some DC loads commonly used by a micro-grid; presetting a bus voltage reference valueof the direct-current microgrid; providing the consistency sliding mode control method considering voltage regulation and current correction control. The controller controls the bus voltage when the system fluctuates, so that the bus voltage is recovered to a set value, the voltage and current values are regulated through sliding mode control, and high precision of load power distribution is achieved.

Description

technical field [0001] The invention belongs to the technical field of compensating busbar voltage and power output distribution design of micro-source converters in DC microgrid, and specifically relates to a control method. Background technique [0002] In recent years, with the continuous consumption of conventional energy sources such as coal, oil, and natural gas, and the increasingly prominent pollution problems, new energy power generation represented by photovoltaics and wind power has gradually become a rising star in the energy industry, and this field has developed rapidly. . Subsequently, how to connect this new energy power generation has become a temporary problem. For this reason, experts and scholars have proposed the concept of microgrid. [0003] The Energy Internet is an important means to solve large-scale grid integration of renewable energy power generation, improve power quality and user demand side management, and improve the reliability, security an...

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Problems solved by technology

[0005] In order to overcome the deficiencies of the existing droop control in improving the contradictory relationship between load power distribution accuracy and compensating bus voltage, when the DC microgrid loses contact with the large power grid, it needs to independently undertake the problems of system voltage stability and accurate power distribution , the present invention proposes a consistent sliding mode control method including bus voltage compensation and load power distribution. First, droop control is used in the main control layer to realize power sharing among distributed power sources. Secondly, in the droop control On the basis of this, a secondary sliding mode control considering voltage regulation control and current correction control is proposed; through the error value parameter, the setting error value is reduced through the sliding mode controller, so as to realize the rapid tracking of the actual voltage value to the set reference value and reach the voltage recovery goals

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