A static safety region assessment method for power grid multiple faults based on state superposition method

A technology of static safety domain and multiple faults, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., and can solve problems such as complex multiple faults that cannot be considered

Active Publication Date: 2019-07-19
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing static safety and stability assessment method cannot consider complex multiple faults. For the first time, a method for evaluating the static safety domain of multiple faults in the power grid based on the state superposition method is proposed, which can solve accidents that take into account N-m multiple faults in the power grid The static safety domain of the state space of the previous components, and based on this, the safety margin of the power grid operation can be effectively evaluated

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  • A static safety region assessment method for power grid multiple faults based on state superposition method
  • A static safety region assessment method for power grid multiple faults based on state superposition method
  • A static safety region assessment method for power grid multiple faults based on state superposition method

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[0032] The technical solutions in the present invention will be clearly and completely described below in conjunction with specific embodiments and accompanying drawings.

[0033] Such as Figure 9 As shown, the present invention provides a method for assessing multiple fault static safety domains based on the state superposition method, comprising the following steps:

[0034] Step 1: Calculate the transfer ratio λ from a component m1 in the faulty component set [1,M] to a component C∈[M+1,N] outside the faulty component set m1→C : Given the power flow under the calculation method S, the outage fault component set [1, M] based on the S method is denoted as the method S N-m , calculate S N-m In the power flow mode, read the power flow P' of component C C(N-m) ;Based on the S mode, the other m-1 components in the outage fault component set [1,M] except the component m1 are recorded as the mode S m1 , calculate S m1 In the current mode, read the power flow P′ of the compone...

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Abstract

The invention discloses a power grid multi-fault static safe domain evaluation method based on a state superposition method, wherein the power grid multi-fault static multi-fault static safe domain evaluation method belongs to the field of power grid stabilizing and controlling. The power grid multi-fault static safe domain evaluation method is based on a characteristic that power grid fault flow transfer is approximately linear, and superposability of power grid multi-fault flow transfer in an element state space is realized. For aiming at a random network structure, a flow transfer ratio in which multi-element coupling of multi-fault is considered can be solved according to a state superposing method, and furthermore a multi-fault static safe domain equation is obtained. Whether the power grid flow operates in a static safe domain is determined through a distance between an operation point and a static state safe domain hyperplane. The power grid multi-fault static safe domain evaluation method settles a problem of incapability of considering multiple complicated faults according to an existing safe domain solving method and can effectively perform static safe margin evaluation on a power grid element, thereby preventing element overload caused by multiple faults of the power grid.

Description

technical field [0001] The invention relates to the field of power grid stability and control, in particular to a method for evaluating static security domains of multiple faults in a power grid based on a state superposition method. Background technique [0002] With the continuous production of power supplies, the continuous development of the grid scale and the continuous increase of load, the requirements for the safe and stable operation of the grid and the reliability of power supply are also gradually increasing. However, blackout accidents caused by the destruction of power system security and stability occur from time to time, which shows that the power system urgently needs more powerful methods to realize its online real-time security monitoring, defense and control. The existing static safety assessment methods considering the system undergoing faults such as short circuit or unexpected exit of components are as follows: [0003] The first is the point-by-point ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 刘海光周鲲鹏周楚曹侃蔡德福董航王涛黄文涛何俊万黎唐泽洋王文娜闫秉科王莹饶渝泽
Owner STATE GRID CORP OF CHINA
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