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Flexible DC-containing AC/DC hybrid system power flow alternating iterative computation method

An AC-DC hybrid, system power flow technology, applied in the direction of AC networks with the same frequency from different sources, etc.

Active Publication Date: 2018-09-04
GUANGDONG POWER GRID CO LTD SHANTOU POWER SUPPLY BUREAU
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of power flow calculation of the AC-DC hybrid system with flexible DC

Method used

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  • Flexible DC-containing AC/DC hybrid system power flow alternating iterative computation method
  • Flexible DC-containing AC/DC hybrid system power flow alternating iterative computation method
  • Flexible DC-containing AC/DC hybrid system power flow alternating iterative computation method

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Embodiment Construction

[0051] Further description will be made below in conjunction with the accompanying drawings.

[0052] The present invention proposes a power flow calculation method for an AC / DC hybrid system with flexible DC based on an alternate iterative method, which includes the following steps:

[0053] (1) Obtain the number n of AC nodes of the AC-DC hybrid system, which includes the virtual nodes on the valve side of the connecting transformer, and number the AC nodes from 1 to n; obtain the number m of VSC converters, and number the VSC converters from 1 to m is numbered; define i, j=1~n, and the initial value of i, j is 1; define k, t=1~m, and the initial value of k, t is 1; define l as the number of iterations, and l The initial value of 0, set the maximum number of iterations l max ;

[0054] (2) Collect the parameters of the i-th node, including the active power injected by the generator at the PQ node P Gi , inject reactive power Q Gi , active load P Di , reactive load Q Di...

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Abstract

The invention provides a flexible DC-containing AC / DC hybrid system power flow alternating iterative computation method, so as to solve the problem of power flow computation of the flexible DC-containing AC / DC hybrid system. The method particularly comprises steps: AC / DC hybrid power grid line and node parameters are acquired, wherein the type and the parameter of a connected transformer valve-side virtual node are determined by a corresponding converter control mode and a set value; DC power flow computation is carried out, and if a DC variable crosses a border, a corresponding column of a DCJacobian matrix is removed; a DC power flow computation result is used to correct the absorption or injection power of the virtual node, AC power flow computation is carried out, and the obtained connected transformer valve-side virtual node and AC bus voltage are used as known quantities for next DC power flow iteration; and whether AC and DC power flows are converged is judged, whether the control angle of the converter and the angular phase difference between virtual node and converter AC bus voltage are smaller than computation precision is judged, if yes, convergence is carried out and operation is exited, or otherwise, DC power flow computation is returned.

Description

technical field [0001] The invention relates to power system power flow calculation, in particular to an alternate and iterative calculation method for power flow of an AC-DC hybrid system with flexibility. Background technique [0002] At present, relatively rich results have been obtained in the power flow algorithm of the AC-DC hybrid system including traditional DC, and the calculation methods are mainly divided into two categories: unified iteration method and alternate iteration method (decoupling algorithm). However, the power flow calculation method for the AC-DC hybrid system with flexible DC is not yet mature. Compared with the calculation method with traditional DC, the two cannot be completely equivalent due to the large differences in physics and control variables. [0003] In recent years, many methods have been proposed for the power flow calculation of the AC-DC hybrid system with flexible DC. However, on the one hand, they are limited by the variety and comp...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 张松光黄辉陈光侵文安魏承志许树楷蔡璐璇余江李洁陈俊陈涛陈名江浩侠董华梁刘琨屠卿瑞周月宾陈亦平苏寅生黄维芳
Owner GUANGDONG POWER GRID CO LTD SHANTOU POWER SUPPLY BUREAU
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