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A method for obtaining the receiving-end power network strength of a DC multi-feed system including an asynchronous motor

A technology for asynchronous motors and receiving power grids, applied to AC networks, circuit devices, and AC network circuits with the same frequency from different sources, can solve problems such as unanalyzed influence of asynchronous motor system voltage stability, and achieve accurate judgment, Physically defined effects

Active Publication Date: 2018-12-14
STATE GRID ZHEJIANG ELECTRIC POWER +2
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Problems solved by technology

[0004] The current generalized short-circuit ratio index does not analyze the influence of asynchronous motors on system voltage stability

Method used

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  • A method for obtaining the receiving-end power network strength of a DC multi-feed system including an asynchronous motor
  • A method for obtaining the receiving-end power network strength of a DC multi-feed system including an asynchronous motor
  • A method for obtaining the receiving-end power network strength of a DC multi-feed system including an asynchronous motor

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Embodiment

[0059] This embodiment is a method for obtaining the power grid strength at the receiving end of a DC multi-infeed system including an asynchronous motor, which includes steps:

[0060] Through the saddle node bifurcation method of static voltage stability of the system, the system characteristic equation of the DC multi-infeed system with asynchronous motor is established;

[0061] The diagonal matrix diag of the reciprocal of the DC rated transmission power measured and calculated from the grid -1 (P 1 ,...,P n ), n represents the number of DC in the DC multi-infeed system, and P represents the rated power;

[0062] The Thevenin equivalent admittance matrix B fed to the AC bus node by the AC grid at the receiving end by only retaining the DC inverter side, the negative matrix -diag of the diagonal matrix -1 (P 1 ,...,P n ) is multiplied by the equivalent admittance matrix B and subjected to eigenvalue decomposition to obtain the generalized short-circuit ratio gSCR of a...

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Abstract

The invention discloses a method for obtaining the receiving-end power network strength of a DC multi-feed system including an asynchronous motor. The invention adopts a saddle node bifurcation methodfor stabilizing the static voltage of the system, the characteristic equations of DC multi-feed system with asynchronous motor are established, based on the diagonal matrix of the reciprocal of the rated DC transmission power measured and calculated from the power network, the Thevenin equivalent admittance matrix is fed into the AC bus node by the receiving AC power network through reserving only the DC inverter side, the negative matrix of diagonal matrix is multiplied with the equivalent admittance matrix and the eigenvalue decomposition is used to obtain the generalized short-circuit ratio of multi-infeed DC system with asynchronous motor, The critical generalized short-circuit ratio and boundary generalized short-circuit ratio of DC multi-feed system are obtained by solving the equivalent eigenvalue equation of the system, and the receiving network strength of DC multi-feed system with asynchronous motor is determined according to the generalized short-circuit ratio. The invention enables a DC multi-feed system containing an asynchronous motor to stably operate.

Description

technical field [0001] The invention relates to a method for obtaining the strength of a receiving-end power grid, in particular to a method for obtaining the strength of a receiving-end power grid for a DC multi-infeed system containing an asynchronous motor. Background technique [0002] With the continuous improvement of DC transmission technology, my country's Sanhua and China Southern Power Grid have increasingly shown the important characteristics of multiple DC feeds into the same load center. The mutual coupling between DC converter stations and between DC and AC systems makes the static voltage stability of multi-infeed DC systems prominent and difficult to analyze. [0003] At present, scholars at home and abroad have proposed a variety of DC multi-infeed system indicators to evaluate the voltage support capability of DC multi-infeed systems. The CIGRE DC working group first proposed the multi-infeed short-circuit ratio index based on the multi-infeed interaction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 徐谦辛焕海戴攀章枫
Owner STATE GRID ZHEJIANG ELECTRIC POWER
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