Large power grid quiescent voltage stability optimization decision-making method and system considering situation evaluation

Abstract

The invention provides a large power grid quiescent voltage stability optimization decision-making method and system considering situation assessment, prediction and control can be realized on line, and the problem that the system operation state is difficult to recover due to state fluctuation and decision-making time delay is solved. For a conventional prevention and control optimization model,constraint conditions in the control model are corrected by utilizing the situation evaluation indexesto compensate decision latency, the stability level of the section is predidcted and estimated through the current section; the stability level of the next moment can be estimated according to the tide state of the current moment; when the stability margin of the real-time section is not lower than the threshold value, a corresponding regulation and control strategy is executed; therefore, early judgment and early regulation and control are realized, the situation that the system operation state is difficult to recover due to state fluctuation and decision delay is avoided, and the possible voltage instability situation in the future estimated state is effectively regulated and controlledaccording to the current power flow section information.

Description

technical field [0001] The present disclosure relates to the relevant technical field of online monitoring of electric power system, specifically, it relates to a method and system for optimizing decision-making of static voltage stability of a large power grid taking into account situation assessment. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] With the increasing scale of the interconnected grid, the promotion of power market reform and the application of various power electronic components, the operating state of the power system is becoming more and more complex and gradually approaching the static stability limit, while the scale of grid-connected renewable energy such as wind power continues to expand. It also leads to an increase in the uncertainty of the system's operating state, and the discrete variables (such as capacitors...

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Problems solved by technology

[0004] Most of the voltage stability control methods in the existing technology only perform regulation when the voltage stability level is detected to be insufficient, without pre-judgment and regulation, making it difficult to restore the system operating state, such as a real-time control of voltage stability based on a real-time status section The optimization method can quickly obtain online auxiliary decision-making information, and can meet the real-time requirements of large power grid optimization decision-making to a certain extent

However, under the new situation that the large-scale access of renewable energy or power electronic equipment makes the system operation state fluctuate frequently and randomly, the evolution trend of the operation state of the large power grid and the influence of the time lag of control and optimization decision-making calculation on the voltage stability of the power system are not considered. , making optimization decisions when the voltage stability level is detected to be insufficient may lead to missing the best opportunity for preventive control, resulting in system voltage collapse

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