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Parameterization Thevenin equivalence-based alternating current direct current received end power grid commutation failure fault preventive method

A Thevenin equivalent, receiving-end power grid technology, applied in the direction of AC network circuits, power transmission AC networks, circuit devices, etc., can solve the problems of loss of power, receiving-end power grid voltage, frequency shock, endangering the security and stability of the receiving-end power grid, etc. The effect of achieving good applicability, fast calculation speed, and improving the ability to defend against commutation failure failures

Active Publication Date: 2018-02-09
ZHEJIANG UNIV +3
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  • Abstract
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  • Claims
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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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  • Parameterization Thevenin equivalence-based alternating current direct current received end power grid commutation failure fault preventive method
  • Parameterization Thevenin equivalence-based alternating current direct current received end power grid commutation failure fault preventive method
  • Parameterization Thevenin equivalence-based alternating current direct current received end power grid commutation failure fault preventive method

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Embodiment Construction

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

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

[0070] Step (1): Load the steady-state power flow data of the AC / DC receiving end power grid, and the data of components such as generators, buses, lines, etc., and perform the power flow calculation 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 for the receiving end grid;

[0072] Step (3): Based on the short-circuit current calculation model of the power grid obtained in (2), with the control variables to be optimized as parameters, a parameterized Thevenin equivalent model of the receiving end power grid is established through t...

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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 specifically relates to a method for preventing commutation failure of AC and DC receiving end power grids based on parameterized Thevenin equivalent. Background technique [0002] In recent years, power construction has developed rapidly, with multiple high-voltage and UHV DC transmission lines completed and put into operation, and the proportion of cross-regional incoming power has been continuously increasing. In this context, the commutation failure of the DC converter station occurs, and the power is lost, which impacts the voltage and frequency of the receiving end grid. In the worst case, continuous commutation failures and DC blocking occur, which endanger the safety and stability of the receiving end grid. For this reason, improving the ability of AC and DC receiving-end power grids to prevent DC commutation failures is a top priority for improving the safe operation of the power gr...

Claims

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Application Information

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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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