An online comprehensive defense method for power system security and stability

Abstract

The invention discloses a safe and stable online comprehensive defense method for an electric power system, and belongs to the safe and stable control technical field of the electric power system. When the electric power system is in a quasi-steady-state operational state, a safe and stable prevention control online strategic decision specific to a preconceiving fault set, a safe and stable emergency control online pre-strategic decision specific to each preconceiving fault, and a safe and stable emergency control real-time strategic decision specific to the actual operational state of the electric power system are calculated separately; whether the duration between the operational moment and the current moment of the electric power system under the three kinds of control strategic decisions exceeds a corresponding constant value or not is taken as the effective criterion for each type of the control strategic decision; a to-be-executed control measure is determined by combination with the control strategic decision selection principle that the safe and stable emergency control real-time strategic decision is adopted firstly, the safe and stable emergency control online pre-strategic decision is adopted secondly, and the safe and stable prevention control online strategic decision is adopted finally in sequence; and therefore, a practical and effective method is supplied to the safe and stable online comprehensive defense of the electric power system.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability control. More precisely, the invention relates to a method suitable for comprehensively applying multiple control means of on-line preventive control, on-line emergency control and real-time emergency control to prevent power system from losing safety and stability. Background technique [0002] At present, the comprehensive defense measures for power system security and stability are mainly based on the guidelines for power system security and stability through offline analysis and calculation to plan the operation mode, and the online security and stability analysis technology based on the actual operation section data of the power system is used to support the safe and stable operation of the power system. . With the large-scale access of intermittent new energy power generation, the gradual advancement of the power market and the implementation of the future energy In...

AI Technical Summary

Problems solved by technology

[0003] To ensure the safe and stable operation of the power system is to be able to deal with various faults (or disturbances) that the power system may suffer. Safety and stability analysis can only analyze a small number of expected failures, so there must be some other unexpected failures that will cause the power system to lose safety and stability

In addition, because the online security and stability analysis always needs a certain amount of computing time, and the power system may have changed during this period, even if the online security and stability analysis based on the future operation mode is used, it will also be affected by the future operation mode. It is likely to be inconsistent with the actual operation mode in the future, which makes it difficult to guarantee the safety and stability of the predicted failures in the online security and stability analysis of the predicted failures.

In fact, due to the inconsistency between the power system model and parameters, especially those closely related to transient and dynamic security and stability calculations, and the actual ones, the online security and stability analysis results will also deviate from the actual power system

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