Uncertainty optimization operating method for alternating current and direct current microgrid comprising high-density intermittent energy source

Abstract

Disclosed is an uncertainty optimization operating method for an alternating current and direct current microgrid comprising high-density intermittent energy source. According to the characteristics of the microgrid and on the basis of taking output uncertainty of the intermittent energy source into consideration, a wind energy and solar energy output fuzzy random model, a diesel generator fuel cost module and an energy storage cost module are established; by combination with the grid structure characteristics of the microgrid and the problem of high output fluctuation caused by access of a large amount of intermittent energy source, a fuzzy random optimization model capable of minimizing the comprehensive operating cost of the alternating current and direct current hybrid microgrid, and a real-time imbalance power adjusting model capable of minimizing adjusting expenditure are established; and the fuzzy random optimization model capable of minimizing the comprehensive operating cost of the alternating current and direct current hybrid microgrid is solved by a fuzzy random uncertainty alternating direction multiplier optimization algorithm so as to obtain an operating scheme of the alternating current and direct current hybrid microgrid. By virtue of the uncertainty optimization operating method, the accuracy of the dispatching plan of the microgrid comprising the high-density intermittent energy source can be effectively improved, imbalance power can be lowered, and imbalance power adjusting expenditure caused by day-head dispatching deviation can be reduced.

Description

technical field [0001] The invention relates to a method for optimal operation of a microgrid. In particular, it relates to an uncertain optimal operation method for an AC / DC microgrid with high-density intermittent energy sources. Background technique [0002] Compared with the traditional power grid, the microgrid has the advantages of high power supply reliability and environmental friendliness, and can effectively make up for the shortcomings of centralized power generation and high-voltage and high-power transmission. An important part of the distribution network. [0003] According to the grid structure, microgrids can be divided into AC microgrids, DC microgrids and AC / DC hybrid microgrids. AC-DC hybrid microgrid is a promising microgrid structure because it has the advantages of both AC microgrid and DC microgrid, and is convenient for various forms of distributed power access. [0004] With the increase in the number and scale of microgrids, microgrids containing...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an uncertain optimization of AC-DC micro-grid with high-density intermittent energy that can solve the problem of large day-ahead scheduling deviation caused by high-density intermittent energy access to AC-DC hybrid micro-grid run method

[0010] 2) Combining the structure characteristics of the microgrid grid and the large output fluctuation caused by a large number of intermittent energy access, establish a fuzzy stochastic optimization model to minimize the comprehensive operation cost of the AC-DC hybrid microgrid and a real-time unbalanced power to minimize the adjustment cost adjust the model;

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