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A fault prevention method for commutation failure of AC-DC receiving-end power grid based on parameterized Thevenin equivalent

A Thevenin equivalent and receiving-end power grid technology, applied to AC network circuits, power transmission AC networks, circuit devices, etc., can solve problems such as loss of power, receiving-end grid voltage, frequency impact, endangering the safety and stability of the receiving-end grid, etc.

Active Publication Date: 2020-05-19
ZHEJIANG UNIV +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this context, the commutation failure of the DC converter station occurs, ranging from power loss, impacting the voltage and frequency of the receiving end grid, to severe cases of continuous commutation failure followed by DC blocking, endangering the safety and stability of the receiving end grid

Method used

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  • A fault prevention method for commutation failure of AC-DC receiving-end power grid based on parameterized Thevenin equivalent
  • A fault prevention method for commutation failure of AC-DC receiving-end power grid based on parameterized Thevenin equivalent
  • A fault prevention method for commutation failure of AC-DC receiving-end power grid based on parameterized Thevenin equivalent

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Embodiment Construction

[0068] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0069] This embodiment provides a commutation failure prevention method based on parameterized Thevenin equivalents of the AC / DC receiving end power grid, such as figure 1 shown, including the following steps:

[0070] Step (1): Load the steady-state power flow data of the AC / DC receiving-end power grid, component data such as generators, busbars, lines, etc., and perform power flow calculations under the normal operation mode of the receiving-end power grid;

[0071] Step (2): Based on the data obtained in step (1), establish a short-circuit current calculation model of the receiving end power grid;

[0072] Step (3): Based on the short-circuit current calculation model of the power grid obtained in (2), using the control variable to be optimized as a parameter, a parameterized Thevenin equivalent model of the receiving power grid is established throu...

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Abstract

The invention relates to a parameterization Thevenin equivalence-based alternating current direct current received end power grid commutation failure fault preventive method. A parameterization received end power grid Thevenin equivalence model is obtained by adopting a generalized Galerkin method according to an alternating current direct current received end power grid short circuit current calculation model by considering a direct current commutation failure and multi-convertor-station concurrence failure caused by the alternating current system faults; and by taking the weight sum for improving the single convertor station commutation failure immune factor and the multi-convertor-station commutation failure immune factor as the optimization target, and by taking the parameterization Thevenin equivalence model as the constraint condition, an optimization model is established, so that the alternating current direct current received end power grid commutation failure fault defensive capability is improved. The method has relatively high applicability and high calculation speed, and can adapt to the alternating current direct current received end power grids in different operationmodes, and can better satisfy the actual demands.

Description

technical field [0001] The invention belongs to the technical field of power systems, and in particular relates to a commutation failure prevention method for an AC / DC receiving end power grid based on parameterized Thevenin equivalents. Background technique [0002] In recent years, electric power construction has developed rapidly, a number of high-voltage and ultra-high voltage direct current transmission lines have been completed and put into operation, and the proportion of inter-regional incoming electricity capacity has continued to increase. In this context, the commutation failure of the DC converter station occurs, ranging from power loss, impacting the voltage and frequency of the receiving end power grid, to severe cases of continuous commutation failure and subsequent DC blockage, endangering the safety and stability of the receiving end power grid. For this reason, improving the ability of the AC-DC receiving end grid to prevent DC commutation failure is the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 夏冰清邱一苇吴浩宋永华凌卫家孙维真楼伯良邓晖华文黄弘扬赵一琰
Owner ZHEJIANG UNIV
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