Distributed economic dispatch and coordination control method for micro-grid system

Abstract

The invention discloses a distributed economic dispatch and coordination control method for a micro-grid system, and belongs to the technical field of distributed generation. The distributed economic dispatch and coordination control method comprises the steps that m loads are controlled by n distributed power sources; the first distributed power source is used as a master control unit, the V/f control method is adopted for control, the master control unit is made to supply voltage and frequency references to the other distributed power sources in a micro-grid, and fluctuations of output power and loads of the other distributed power sources are tracked through charging and discharging control; the other distributed power sources are controlled by the PQ control method, provide output power for the micro-grid, and are responsible for power dispatch of the micro-grid; the distributed economic dispatch algorithm is used for calculating output results of the optimum active power of all the distributed power sources. The distributed economic dispatch and coordination control method is used for controlling and coordinating the micro-grid system, so that the generation cost of the system is greatly reduced, system communication traffic is reduced, and system running reliability is ensured.

Description

technical field [0001] The invention relates to the technical field of distributed power generation, in particular to a method for distributed economic scheduling and coordinated control of a microgrid system. Background technique [0002] At present, with the rapid development of economy and society, people's demand for electricity is constantly increasing. However, conventional energy sources such as coal and oil in the world have limited resources and are increasingly polluting the atmosphere. The current energy shortage and environmental degradation force us to look for other renewable energy sources to replace the existing conventional energy sources. Therefore, distributed power generation with small capacity, low cost, and ability to provide reliable and clean energy has received more and more attention and application. Connecting distributed power generation to the large power grid in the form of a micro-grid for grid-connected operation and mutual support with the ...

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Problems solved by technology

[0004] The existing technology has the following disadvantages: 1) The traditional economic dispatch is carried out through a centralized computing unit, which requires the power generation and load demand information of each unit in the microgrid system, and the communication volume is very large, which affects the distributed power supply. Flexibility and "plug and play" features; 2) If there is a fault in the distributed power supply in the microgrid system, the power supply system cannot detect it in time and repair it, there will be a power outage, and the reliability of the power supply is lacking. Seriously affect the normal life of residents; 3) The traditional economic dispatch is realized by manually adjusting the power generation of the generator set by the operator according to the plan made in advance, and the energy control in the whole system is open-loop, that is, the traditional economic dispatch is Offline scheduling affects the efficient and economical operation of power generation units in the microgrid

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