A Hierarchical Dynamic Equivalence Method Applicable to Regional Power Grids

Abstract

The invention discloses a hierarchical dynamic equivalence method suitable for a regional power grid. The method comprises the steps of dividing a large-scale power grid into an internal system and an external system; building a power grid model of the internal system according to a topological structure of the internal system; dividing the external system into three layers of an outer-layer external network, an inner-layer external network and a buffer network; building an equivalent model of the outer-layer external network by adopting a coherent equivalence method; building an equivalent model of the inner-layer external network by adopting a dynamic equivalence method based on physical equivalence; building a power grid model of the buffer network according to a topological structure of the buffer network; simplifying 500kV backbone networks in the equivalent model of the outer-layer external network and the equivalent model of the inner-layer external network to the boundary of the buffer network by adopting a backbone network simplification method, and forming an equivalent model of the external system by the equivalent model of the outer-layer external network, the equivalent model of the inner-layer external network and the power grid model of the buffer network; and combining the power grid model of the internal system with the equivalent model of the external system to finally obtain an equivalent model of the regional power grid. According to the method, the simulation efficiency and the equivalence precision are ensured.

Description

technical field [0001] The invention belongs to the field of dynamic equivalence of power systems, in particular to a layered dynamic equivalence method suitable for regional power grids. Background technique [0002] In order to analyze and solve various problems of the regional power grid, it is necessary to establish a simulation model of the regional power grid to simulate the dynamic characteristics of the power grid under various working conditions. At present, my country's power grid is gradually forming a situation where multiple large-scale power grids are interconnected. Large-scale power grids have certain advantages in power dispatching. However, it is impossible and unnecessary to model the entire large-scale power grid when only focusing on one of the regional power grids. simulation. The usual practice is to retain the detailed model of the internal system to be studied, reduce the order and simplify the part of the external system that has little influence on...

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Problems solved by technology

The discrimination of the former coherent fleet is affected by working conditions and disturbances, and the static network is used for simplification; the latter model is described in detail, but the workload of simplification is relatively large

In addition, the research objects of existing dynamic equivalent methods are mostly large-scale cross-regional power grids or provincial power grids. No buffer, although the simulation efficiency can be guaranteed, but the equivalent accuracy is greatly reduced

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