Method for optimizing grid-connected unit excitation difference adjustment coefficient based on minimum overall network loss

Abstract

The invention discloses a method for optimizing grid-connected unit excitation difference adjustment coefficient based on minimum overall network loss in the technical field of power system analysis and control. The method includes the steps: building a load flow calculation model affecting the generator excitation difference adjustment coefficient; determining a load flow constraint equation; building a grid-connected unit excitation difference adjustment coefficient optimization object function aiming at the minimum overall network loss, and determining constraint conditions of the optimization object function; gaining the optimal solution of the optimization object function according to the load flow calculation model and the load flow constraint equation to obtain the optimized excitation difference adjustment coefficient. The method overcomes the shortcoming that a traditional method determines the difference adjustment coefficient by experience, stable voltage is ensured, and the economic benefit of a power grid is the highest.

Description

technical field [0001] The invention belongs to the technical field of power system analysis and control, and in particular relates to an optimization method for excitation adjustment coefficient of a grid-connected unit based on the minimum network loss of the entire network. Background technique [0002] The limitation of the selection of traditional excitation adjustment coefficients is that, for units operating in parallel, in principle, each unit is required to have a positive adjustment at the parallel point and the adjustment coefficients are completely equal in order to ensure the stable operation of the units and the reasonable distribution of reactive power. The desirable adjustment coefficient is 3%-5%. However, the selection of the traditional excitation adjustment coefficient is only roughly in the range of 3%-5%, but the specific selection is often based on experience and lacks specific theoretical calculations. At the same time, because the traditional excita...

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Problems solved by technology

[0002] The limitation of the selection of traditional excitation adjustment coefficients is that, for units operating in parallel, in principle, each unit is required to have a positive adjustment at the parallel point and the adjustment coefficients are completely equal in order to ensure the stable operation of the units and the reasonable distribution of reactive power. Desirable adjustment coefficient 3%-5%

However, the selection of the traditional excitation adjustment coefficient is only roughly in the range of 3%-5%, but the specific selection is often based on experience and lacks specific theoretical calculations

At the same time, since the traditional excitation adjustment coefficient is determined based on experience, it is relatively random, which can ensure that the power grid is in an economic state with the smallest network loss

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