Multistage power grid linkage unit combination scheduling method in regional power system

Abstract

The invention discloses a multistage power grid linkage unit combination scheduling method in a regional power system. The method comprises the following steps: determining multistage power grid active loads and operation parameters of each stage of power grid unit in the regional power system; establishing a safety constraint unit combination economic dispatching model considering unit start andstop and taking active loads of all levels of power grids as linkage decision quantities; and solving the model based on a target cascade analysis method, and determining an optimal scheduling resultof the system. The micro-grid constraints comprise micro-grid power balance constraints and micro-grid tie line transmission power constraints. The method surrounds an electric power system in a certain area; the goal of minimizing the total operation cost of the regional system is achieved. On the premise of meeting respective constraints of all levels of power grid layers, a safety constraint unit combination model considering unit start and stop is established. The active capacity of each level of power grid layer is taken as a linkage decision amount to make unified analyses and decisionsof a full power system. The model is solved by adopting a distributed parallel computing target cascade analysis method (ATC) to realize source-network-load cooperative scheduling of a complex system.

Description

technical field [0001] The invention relates to the technical field of power system analysis, in particular to a unit combination scheduling method for regional power system multi-level power grid linkage. Background technique [0002] Today, in the face of wide-area interconnected power systems, the power grid presents a multi-layer and multi-level complex topology. Different from traditional power systems, active distribution grids (ADG) and microgrids (MG) not only have distributed Renewable energy power generation also has active power sources or loads such as conventional power sources, energy storage, and demand-side response. As a result, two-way flows appear between transmission-distribution-micro-grids at all levels, breaking the traditional transmission network from top to bottom. The existence of active distribution grid (ADG) and microgrid (MG) makes the power flow upstream in the power grid. In this case, if we continue to use the unit combination problem with ...

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Problems solved by technology

In this case, if we continue to use the unit combination problem with traditional security constraints (in the traditional power system, there is no active power source in the power distribution and microgrid, there is no need to consider when solving the unit combination problem of the regional power system distribution network and the following network), it will inevitably lead to the irrationality of its decision-making results, and it will not be able to achieve the most effective goal of accepting renewable energy power generation

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