An optimization method for transient voltage safety preventive control considering a large number of anticipated faults

A transient voltage and predictive fault technology, applied in the field of transient voltage safety prevention and control optimization, to reduce the risk of commutation failure and improve the safety level of transient voltage

Active Publication Date: 2022-05-13
TSINGHUA UNIV +2
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Problems solved by technology

However, the existing research generally only considers a small number of specified fault constraints in the optimization model, or considers adding reactive power compensation equipment in the power grid at the same time, and how to satisfy a large number of expected fault safety constraints of the actual power grid through preventive control still less research

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  • An optimization method for transient voltage safety preventive control considering a large number of anticipated faults
  • An optimization method for transient voltage safety preventive control considering a large number of anticipated faults
  • An optimization method for transient voltage safety preventive control considering a large number of anticipated faults

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Embodiment Construction

[0047] The present invention proposes a transient voltage safety preventive control optimization method considering a large number of anticipated faults, comprising the following steps:

[0048] (1) According to the voltage stability criterion of the Western Power Grid in the United States (WECC), "the voltage amplitude of the load busbar drops by 20% of the voltage before the fault and the duration does not exceed 20 cycles", it is possible to define a voltage that is suitable for the receiving power grid Measure the node's transient voltage dip evaluation index TVSI, as shown in the following formula:

[0049]

[0050]

[0051] In the formula, V 0 Indicates the initial value of the node voltage, v(t) indicates the node voltage at time t after the fault occurs, T flt , T end Respectively represent the time when the fault occurs and the node voltage returns to the initial value V for the first time after the fault 0 moment. D. Pena Indicates the penalty function: wh...

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Abstract

The invention proposes a transient voltage safety prevention control optimization method considering a large number of expected faults, which belongs to the field of power system transient voltage safety evaluation and control. This method is based on measuring the transient voltage sag degree evaluation index of the node, and according to the initial expected fault set, establishes a transient voltage safety preventive control optimization model that considers a large number of expected faults, which is composed of objective functions and constraints; and then through the model Slack variables are introduced into the transient voltage safety constraints, and corresponding penalty items are added to the objective function to relax the original model; finally, the relaxed model is solved by successive linearization method, and the optimized design of each reactive power equipment is obtained. Value. The optimization model established by the invention realizes the safety constraints of as many faults as possible at the level of prevention and control, and the optimization result obtained by the invention can reduce the risk of commutation failure in a DC converter station.

Description

technical field [0001] The invention belongs to the field of transient voltage safety evaluation and control of electric power systems, and in particular relates to a transient voltage safety prevention control optimization method considering a large number of anticipated faults. Background technique [0002] In recent years, due to the energy crisis and the needs of environmental protection. Many countries in the world are vigorously developing renewable energy, including wind power generation and photovoltaic power generation. In addition, there is a reverse distribution of energy resources and loads in our country. In order to meet the needs of power loads, west-to-east electricity transmission channels have basically been formed, and several large-scale multi-current sinks have been formed in the eastern and southern load centers. point receiving end grid. The introduction of this series of new technologies has led to the emergence of a large number of power electronic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/50H02J3/18H02J3/36G06F30/20G06F113/04
CPCH02J3/00H02J3/50H02J3/18H02J3/36G06F30/20H02J2203/20H02J2300/40G06F2113/04Y02E60/60Y02E40/30
Inventor 郭庆来张振安王彬崔惟孙宏斌单瑞卿葛怀畅林银鸿
Owner TSINGHUA UNIV
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