Abstract
The AC/DC hybrid microgrid has a large-scale and complex control process. It is of great significance and value to design a reasonable power coordination control strategy to maintain the power balance of the system. Based on hierarchical control, this paper designs a reasonable power coordination control strategy for AC/DC hybrid microgrid. For lower control, this paper designs a variety of control modes for each converter in different application scenarios. For the higher control, this paper analyzes the working mode of the system and designs the power coordination control strategy under the grid-connected and isolated island mode. In grid-connected operation, the DC bus voltage can be stabilized by adjusting the operation mode of the DC energy storage and the on-off of the secondary load. In isolated island operation, the DC sub-microgrid is the main microgrid, and the DC energy storage is the main power regulating equipment. This is based on the principle of “energy is in short supply in the system, DC energy storage finally discharge, energy supply exceeds demand in the system, DC energy storage gives priority to charging” of DC energy storage. By adjusting the control strategy of the micro-source, the reference power, and the on-off of the secondary load, the overall power balance is maintained. The Matlab/Simulink simulation software was used to build the AC/DC hybrid microgrid simulation model, which verified the effectiveness and stability of the proposed power coordination control strategy under various operating conditions.
Highlights
With the continuous update and development of science and technology, especially the continuous improvement of power electronic interface technology and modern automatic control theory, a small power generation, distribution, and electricity system “microgrid” has been formed, which integrates distributed generation (DG), energy management system, and load [1]
The AC/DC hybrid microgrid system system studied studied in in this this paper paper belongs belongs to a typical topology topology structure structure [15], including AC sub-microgrid, sub-microgrid, DC sub-microgrid, sub-microgrid, and and interlinking interlinking converter, converter, and and the system is incorporated into the public grid by the AC bus
In order to increase the capacity of power flow between subbidirectional AC/DC interlinking converters are placed in the middle of the system as a bridge to microgrids, two parallel bidirectional AC/DC interlinking converters are placed in the middle of the connect the two sub-microgrids
Summary
With the continuous update and development of science and technology, especially the continuous improvement of power electronic interface technology and modern automatic control theory, a small power generation, distribution, and electricity system “microgrid” has been formed, which integrates distributed generation (DG), energy management system, and load [1]. Based on the hierarchical control, respectively, it studies the control strategy of the lower converter and the coordinated control strategy of the overall operating power in the AC/DC hybrid microgrid. This paper sets one or more control strategies for each unit to meet the needs of different situations. For the higher central controller, this paper analyzes the power balance relationship in the AC/DC hybrid microgrid under different operating conditions and designs the power coordination control strategy of AC/DC hybrid microgrid under grid-connected and isolated island conditions. The simulation model of the overall AC/DC hybrid microgrid was built in Matlab/Simulink, and different experimental situations are set to verify the effectiveness of the designed power control strategy.
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