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Power grid multi-disaster coupling cascading fault analysis method and system

A technology of cascading failures and analysis methods, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of not considering the influence of multiple disasters coupled with power grid components, and achieve strong practicability, high accuracy, and reduced effect of loss

Active Publication Date: 2019-07-30
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a power grid multi-disaster coupling cascading failure analysis method and system, which is used to solve the technical problem that the existing power grid cascading failure analysis does not consider the influence of multiple disaster coupling on power grid components

Method used

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  • Power grid multi-disaster coupling cascading fault analysis method and system
  • Power grid multi-disaster coupling cascading fault analysis method and system
  • Power grid multi-disaster coupling cascading fault analysis method and system

Examples

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Embodiment 1

[0064] see figure 1 , a power grid multi-disaster coupled cascading failure analysis method of the present embodiment includes the following steps:

[0065] S1: Set the initial conditions for power grid cascading failure simulation analysis;

[0066] The initial conditions for power grid cascading fault simulation analysis include: the total duration of power grid simulation analysis T end ; grid power flow calculation method and convergence conditions; grid simulation time step △t; overcurrent protection action time T oc and action mode A oc ; Distance protection action time T z and action mode A z ;Temperature protection action time T temp and action mode A temp ;Low voltage protection action time T u and action mode A u ; and the low frequency protection action time T f and action mode A f .

[0067] S2: Read grid data.

[0068] 2.1 Reading the primary parameters of the power grid includes: topology data, line parameters, transformer parameters, load parameters,...

Embodiment 2

[0132] This embodiment is an application example of embodiment 1, comprising the following steps:

[0133] S1: Read the grid data, including the parameters of 1711 lines in the primary parameters of the grid, 1323 bus parameters, 121 motors (including excitation and controller), 233 capacitors and inductors, and 667 loads.

[0134] S2: Read the secondary parameters of the power grid, including: transmission line, generator, busbar relay protection device configuration and setting values ​​of overcurrent protection, distance protection, temperature protection, low voltage protection and low frequency protection;

[0135] S3: Establish the mixed differential algebraic equation of the power grid.

[0136] S4: Set the initial conditions for the simulation analysis of grid cascading faults;

[0137] Power grid simulation analysis total time T end for 2 hours;

[0138] The grid power flow calculation method is Newton Raphson flow, and the convergence condition is that the error i...

Embodiment 3

[0155] This embodiment provides a power grid multi-disaster coupling cascading failure analysis system, including a memory, a processor, and a computer program stored on the memory and operable on the processor. When the processor executes the computer program, the implementation of any of the above-mentioned embodiments step.

[0156] It can be seen from the above that the present invention adopts a multi-disaster coupling cascading fault analysis method through multiple factors such as the operation mode of the power grid, the action characteristics of relay protection, and the trip probability of the external environment. According to the relay protection type of the actual tripping of the power grid, the relay protection model is established to realize the fault simulation of the power grid components; based on the development process of the external environment of the power grid, the failure probability of various external disasters to the power grid is introduced in real ...

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Abstract

The invention discloses a power grid multi-disaster coupling cascading failure analysis method and system, and the method comprises the steps: obtaining a power grid primary parameter and a power gridsecondary parameter, and building a dynamic power grid system model; obtaining external environment data, inputting the external environment data into the dynamic power grid system model, judging whether an external power grid fault event exists, and obtaining a sequence of power grid element faults caused by an external environment in an initial power grid operation mode; establishing a power grid hybrid differential algebraic equation; simulating the dynamic power grid system model according to initial conditions of power grid cascading failure simulation analysis and the established powergrid hybrid differential algebraic equation; during simulation, judging whether the power grid is disconnected according to the admittance matrix Ybus, and if the power grid is not disconnected, continuing operation; judging whether simulation is finished or not; forming a power grid successive fault accident chain; outputting simulation data, and comprehensively evaluating the operation risk of the power grid. According to the method, the influence of multi-disaster coupling cascading faults of relay protection action characteristics on power grid elements can be considered.

Description

technical field [0001] The invention relates to the field of power system analysis and control, in particular to a method and system for analyzing multi-disaster coupling cascading faults in a power grid. Background technique [0002] Various accidents and disasters in the power grid present a trend of frequent occurrence. A large number of cases show that the continuous exchange of matter and energy between various dynamic processes of accident disasters and between each dynamic process and the environment often forms a disaster chain, which plays a key role in the continuous amplification of the disaster evolution effect. Therefore, facing the overall goal of comprehensive risk prevention of major accidents and disasters, it is urgent to change from the research of single disasters to the research of complex evolution of disaster chains and prevention technologies. [0003] Major accidents and disasters often contain multi-hazard coupling and mutual secondary derivation d...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06G06F17/50
CPCG06Q10/0635G06Q50/06G06F30/367
Inventor 陆佳政周特军吴传平陈宝辉郭俊
Owner STATE GRID HUNAN ELECTRIC POWER
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