Method and system for cascading failure risk assessment of high proportion wind power grid-connected

A technology of cascading faults and risk assessment, applied in data processing applications, forecasting, instruments, etc., can solve problems such as increased impact on system stability, inability to fully reflect the actual dynamic characteristics of the power grid, and inability to fully reflect system risks, etc., to improve computing Comprehensive effect of efficiency and risk assessment

Active Publication Date: 2019-01-01
SHANDONG UNIV +2
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The problems of the above research methods are: the complex system theory describes the physical process of cascading failures and reveals the self-organized critical characteristics of the power grid; the complex network theory is often used to analyze system vulnerability, but it cannot fully reflect the actual dynamic characteristics of the power grid; the fault chain The model combines the actual physical process to simulate cascading failures,...

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  • Method and system for cascading failure risk assessment of high proportion wind power grid-connected
  • Method and system for cascading failure risk assessment of high proportion wind power grid-connected
  • Method and system for cascading failure risk assessment of high proportion wind power grid-connected

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Embodiment 2

[0162] The purpose of Embodiment 2 is to provide a computer-readable storage medium.

[0163] In order to achieve the above object, the present invention adopts the following technical scheme:

[0164] A computer-readable storage medium, in which a plurality of instructions are stored, and the instructions are adapted to be loaded by a processor of a terminal device and perform the following processing:

[0165] Step 1: Establish a wind power prediction error model based on historical data to obtain the distribution of wind power output, which is then applied to stochastic power flow calculations;

[0166] Step 2: Select the initial fault set based on the failure rate of the line, the load rate, the proportion of the branch transmission power in the system load, and the system power fluctuation rate caused by the line outage;

[0167] Step 3: A certain fault in the initial fault set occurs, and the fault chain search is started;

[0168] Step 4: Determine whether the system ...

Embodiment 3

[0175] The purpose of Embodiment 3 is to provide a cascading failure risk assessment device for a high proportion of wind power connected to the grid.

[0176] In order to achieve the above object, the present invention adopts the following technical scheme:

[0177] The cascading failure risk assessment device for high-ratio wind power grid connection includes a processor and a computer-readable storage medium, the processor is used to implement various instructions; the computer-readable storage medium is used to store multiple instructions, and the instructions are suitable for being loaded by the processor and perform the following processing:

[0178] Step 1: Establish a wind power prediction error model based on historical data to obtain the distribution of wind power output, which is then applied to stochastic power flow calculations;

[0179] Step 2: Select the initial fault set based on the failure rate of the line, the load rate, the proportion of the branch transmi...

Embodiment 4

[0188] The purpose of Embodiment 4 is to provide a cascading failure risk assessment system for a high proportion of wind power connected to the grid.

[0189] In order to achieve the above object, the present invention adopts the following technical scheme:

[0190] Cascading failure risk assessment system for high proportion of wind power grid-connected, including:

[0191] The wind power output distribution calculation unit establishes a wind power forecast error model based on the wind power forecast error historical data to obtain the wind power output distribution;

[0192] Fault chain set generation unit, comprehensive line failure rate, load rate, the proportion of branch transmission power in the system load, and system power fluctuation rate caused by line outage to select the initial fault set, which is expressed as a line outage sequence;

[0193] When a fault in the initial fault set occurs, start the search: judge whether the power system is disconnected, if dis...

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Abstract

The invention discloses a cascading fault risk assessment method and a cascading fault risk assessment system for high-proportion wind power grid connection. The cascading fault risk assessment methodand the cascading fault risk assessment system comprise the following steps: establishing a wind power prediction error model according to the wind power prediction error historical data to obtain the wind power output distribution; Select the initial fault set; When a fault occurs in the initial fault set, the fault chain search is started: whether the power system is disconnected or not is judged; if the fault is disconnected, the island balance is carried out and the current fault chain search is stopped; If the power system is not disconnected, the stochastic power flow calculation is carried out. If the non-convergence probability of the power flow calculation result is greater than the set value, the load shedding control is carried out. According to the accident chain set generatedabove, the power system loss risk index and line importance index are calculated. The technical proposal provided by the invention fully considers the influence of wind power uncertainty in the evolution process of the accident chain, has more comprehensive risk assessment to the system, and is suitable for the background of high-proportion wind power grid connection.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a cascading failure risk assessment method and system for a high proportion of wind power grid-connected. Background technique [0002] Cascading failures in power systems are a process in which initial disturbances cause other related components to fail one after another and continue to develop. It is the main cause of many major blackouts worldwide in recent years. Although wind power forecasting methods are being continuously improved, there are still 20% to 30% forecasting errors. In the context of a high proportion of renewable energy connected to the grid, the high penetration rate of wind power makes the impact of this uncertainty on the power side of the system more significant, increasing system risk. Therefore, an in-depth study of the system cascading failure risk of wind power grid-connected is of great significance for improving the prevention and control...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q10/04G06Q50/06G06F17/18
CPCG06F17/18G06Q10/04G06Q10/0635G06Q50/06
Inventor 王洪涛徐迪唐亮孙辰军王卓然
Owner SHANDONG UNIV
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