A Calculation Method of Stochastic Power Flow in Large Power System Based on psd-bpa

Abstract

The invention discloses a PSD-BPA-based random power flow calculation method for large-scale power systems. Based on historical data, probability modeling and correlation modeling are performed on wind speed and light intensity; wind speed and light intensity data are generated based on model sampling, and transformed into Set the output scenarios as input; analyze the system operation mode data, modify the corresponding operating parameters according to each sampling scenario, call the PSD-BPA program to complete the calculation, read and record the power flow calculation results in each scenario; read the random power flow calculation results , draw the empirical cumulative distribution function and probability density function; calculate the probability of node voltage and branch power flow exceeding the limit, and analyze the local or overall power flow risk of the system. If the probability is greater than the allowable value, the node / branch is considered to be at risk. The development of the present invention realizes effective calling and data docking of PSD-BPA software, and can realize accurate and efficient Monte Carlo stochastic power flow calculation for large-scale power systems.

Description

technical field [0001] The invention belongs to the technical field of power system simulation and power flow calculation, in particular to a large-scale power system random power flow calculation method based on PSD-BPA software based on PSD-BPA. Background technique [0002] Power flow calculation is an indispensable and important part of power system planning and operation, and provides basic reference and verification basis for system planning and operation. The traditional power flow calculation of the power system mainly refers to determining the operating state of each part of the entire power system according to the given operating conditions and system wiring methods. [0003] In recent years, with the large-scale integration of new energy such as wind energy and solar energy into the grid, a large amount of randomness and uncertainty have appeared on the power supply side of the power system, which makes the spatiotemporal distribution of power flow also exhibit ra...

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Problems solved by technology

Due to the large number of calculations required for Monte Carlo simulation, the accuracy of a single power flow calculation often has to be sacrificed to improve the solution speed, especially when analyzing large-scale systems, it is difficult to fully consider various components and parameters in the system

[0005] At present, there are mature power flow analysis software such as PSD-BPA (Power System Department-Bonneville PowerAdministration, developed by China Electric Power Research Institute based on the imported BPA software) on the market, which can realize power flow iterative calculation and transformer tap adjustment, without Comprehensive modeling of complex regulation processes such as power compensator switching, but these software are usually based on traditional deterministic methods, and its calculation functions are difficult to expand and apply to more complex calculations and analyzes such as random power flows

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