Robust Optimal Scheduling Method for Microgrid Considering Frequency Characteristics of Components

Abstract

The invention discloses a microgrid robust optimization scheduling method in consideration of component frequency characteristics. In consideration of the uncertain fluctuation characteristics of windpower and photovoltaic power output, a microgrid robust optimization scheduling module in consideration of the frequency response characteristics of various components is established. The robust optimization scheduling module is solved by using a Benders decomposition method. An original problem is decomposed into a sub problem and a main problem to be alternately iterated to obtain a robust optimization scheduling scheme. The objective function of the robust optimization model achieves minimum total operating cost of the microgrid under an extreme scenario with maximum network loss. The constraints include active balance constraint, diesel set operating characteristics, energy storage device operating characteristics, line frequency characteristics, load frequency characteristics, voltage safety constraint, and frequency security constraints. The obtained scheduling scheme can ensure that the system cannot exceed a frequency limit within the uncertain fluctuation range of distributedwind power and photovoltaic power output, and ensure the frequency safety of the microgrid.

Description

technical field [0001] The invention relates to the technical field of power grid scheduling, in particular to a robust optimal scheduling method for a micro-grid considering the frequency characteristics of components. Background technique [0002] Throughout the world, most areas are powered by traditional large-scale power grids. Large-capacity generator sets are basically installed in remote power plants near power generation resources. Most loads are concentrated in economically developed urban areas with high population density. Transmission lines carry large amounts of electricity from power plants to load center areas. When the failure in the traditional power grid is not dealt with in time, it may gradually evolve into a major accident, causing power outages in most areas of the entire power grid, resulting in significant economic losses. In addition, the traditional power grid is dominated by thermal generators, and coal-fired gas-fired power generation will produ...

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Problems solved by technology

[0006] The disadvantages of the above-mentioned technologies are: the existing micro-grid optimal dispatch considering photovoltaic and wind power often ignores the frequency characteristics of diesel units, energy storage devices, lines and loads. It will cause the frequency limit of the microgrid system, causing potential safety hazards

On the other hand, to consider uncertainty through stochastic programming, it is necessary to know the probability distribution model of uncertain variables accurately, and to consider uncertain variables through fuzzy optimization. The determination of the membership function of uncertain variables depends on limited sample data and decision makers experience, it is easy to cause errors in the results

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