Dynamic frequency simulation analysis method considering grid loss variable

Abstract

The invention discloses a dynamic frequency simulation analysis method considering a grid loss variable. The method comprises the following steps that S1, before a moment t is set, supply and demand of an n node power system are balanced, the frequency of the power system is stable, parameters of the power system are known, the power system is disturbed at the moment t, and the imbalanced power Pacct of the power system at the moment is calculated; S2, according to the adjustment characteristics and negative-load static frequency characteristics of a generator set, an imbalance expression and a grid loss expression of the system at a moment t+1 are established; S3, the grid loss expression obtained in the step 2 is utilized to establish an expanded power flow equation set considering the grid loss variable at the moment t+ based on a conventional tide equation, and a Newton-Raphson algorithm is utilized to calculate the frequency of the power system at the moment; S4, whether t+1 is smaller than the total simulation duration or not, if not, the operation is finished, if yes, the parameters of the power system are calculated by utilizing the step 3 and are substituted into the step S1, and frequency simulation at a moment t+2 is performed.

Description

technical field [0001] The invention relates to the field of power system frequency simulation, in particular to a frequency dynamic simulation analysis method considering network loss variables. Background technique [0002] Power system frequency is an important parameter for power grid operation, and ensuring system frequency stability is also an important task for power grid operation. In order to better ensure the stability of the system frequency, the frequency simulation of the system is of great significance. The purpose of frequency simulation is different, and different requirements will be put forward for the simulation. To consider the impact of sudden changes in load or power generation in the grid on the grid frequency, the simulation should preserve the network structure. When it comes to network structure calculation, power flow calculation is a very practical means. However, in the process of power flow calculation, the balanced busbar is indispensable, b...

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Problems solved by technology

As the system disturbance continues to increase, the network loss in the system will also increase nonlinearly, and the power imbalance caused by the increased network loss is still fully borne by the manually selected balance nodes, which will affect the system power flow calculation and system frequency simulation. precision, unreasonable

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