A Method for Identifying Vulnerable Lines of Power Grids Containing Wind and Solar Power

Abstract

The method relates to a method for identifying vulnerable lines of a power grid containing wind and solar power, including step 1 of calculating the overload risk factor of the line under the output fluctuation of wind and wind power; k impacted vulnerability index; Step 3 establishes a consequence vulnerability index set including electrical structure importance, disconnection vulnerability index and node voltage offset index; Step 4 calculates the line based on Fuzzy Analysis Hierarchy Process (FAHP) and improved entropy weight method k Vulnerability indicators for disconnection consequences. This method takes into account the influence of random fluctuations in wind power output and can truly reflect the actual operating conditions of the power grid; the comprehensive vulnerability index realizes multi-directional identification of vulnerable lines; an evaluation method based on fuzzy analytic hierarchy process and improved entropy weight method is proposed to solve the problem Regarding the boundary problem of information entropy, it is more reasonable to evaluate the vulnerability of the line by using the optimal mathematical model that takes into account the constraints of conditions to scientifically synthesize expert experience and objective data information.

Description

technical field [0001] The method relates to the field of power system safety and stability analysis, and specifically relates to a method for identifying vulnerable lines of a power grid containing wind and solar power. Background technique [0002] The current methods of identifying vulnerable lines in the power grid mainly focus on the study of system structural vulnerability based on complex network theory, and at the same time, the degree of deviation of various operating states after system failure is included in the vulnerability analysis, only considering the impact of the line failure on other parts of the system , without taking into account the impact of other line faults on the target line, the vulnerable line identification model is not perfect; as the installed capacity of wind and solar power sources in the power grid accounts for an increasing proportion, the output of wind and solar power sources will The negative impact of power fluctuations on the stable o...

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Problems solved by technology

[0002] The current methods of identifying vulnerable lines in the power grid mainly focus on the study of system structural vulnerability based on complex network theory, and at the same time, the degree of deviation of various operating states after system failure is included in the vulnerability analysis, only considering the impact of the line failure on other parts of the system , without taking into account the impact of other line faults on the target line, the vulnerable line identification model is not perfect; as the installed capacity of wind and solar power sources in the power grid accounts for an increasing proportion, the output of wind and solar power sources will The negative impact of power fluctuations on the stable operation of the power grid has gradually become prominent. At present, most literatures have conducted in-depth research on the vulnerability of traditional power grids, and there are relatively few studies on the impact of wind and solar power output fluctuations on the vulnerability of power grids.

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