Rapid probabilistic load flow calculation method considering static power frequency characteristics of electric power system

Abstract

The invention discloses a rapid probabilistic load flow calculation method considering the static power frequency characteristics of an electric power system. The rapid probabilistic load flow calculation method comprises the steps that electric power system parameters needed by conventional load flow calculation are extracted from the electric power system and are initialized; a frequency variable to be solved is added to a conventional load flow calculation model, an improved rapid decoupling load flow module is established, and the normal state of the node voltage, the system frequency and the branch power of the variable to be solved are worked out; cumulants of each order of the node voltage, the system frequency and the branch power are worked out; through Gram-Charlier series expansion, the cumulative probability distribution function and the probability density function of the node voltage, the system frequency and the branch power of the variable to be solved are worked out. According to the rapid probabilistic load flow calculation method, the influence of uncertain factors on the system frequency in the electric power system and the distribution characteristics of the system frequency are considered in the process of probabilistic load flow analysis, the calculation speed is high, and a complete comprehensive assessment can be provided for the safe and economical operation analysis and the stability analysis of the electric power system.

Description

technical field [0001] The invention belongs to the field of power system steady-state analysis, and more specifically relates to a fast probabilistic power flow calculation method considering the power-frequency static characteristics of the power system. Background technique [0002] Power flow calculation is the calculation of determining the steady-state operating state parameters of each part of the power system based on the given grid structure, parameters, and operating conditions of generators, loads and other components. Usually the given operating conditions include the power of each power source and load point in the system, the voltage of the pivot point, the voltage of the balance point and the phase angle. The operating state parameters to be obtained include the voltage amplitude and phase angle of each bus node of the power grid, the power distribution of each branch, and the power loss of the network. Power flow calculation is a basic calculation of the pow...

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Problems solved by technology

In the complex interactive environment of "source-network-load", the load fluctuation and the uncertainty of renewable power output make the power flow distribution of the power system appear random, which may affect the safe operation of the power grid.

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