New energy uncertain power system security risk prevention control method and device

Abstract

The invention discloses a safety risk prevention and control method and device for a new energy uncertain electric power system, enumerating and combining schemes among corresponding control schemes, deleting combinations that do not satisfy deterministic constraint conditions, and forming all possible control schemes; All possible control schemes are sorted according to the order of the calculated value of the objective function from small to large, and the safety and stability evaluation calculation of all the expected failures in the expected failure set is carried out for each control scheme in turn in the scenario operation mode of safety and stability risks, and the obtained After the fault occurs, the total amount of load and the total amount of units cut off are judged whether they meet the chance constraints in the safety and stability risk prevention control model. If they are satisfied, the control plan is output as the final control plan. The invention takes into account the control cost of adjusting the output of thermal power units and the risk of electricity abandonment that limits the output of new energy clusters; meets the practical requirements of prevention and control; and the calculation speed and accuracy requirements of online safety and stability risk prevention and control.

Description

technical field [0001] The invention relates to a safety risk prevention and control method and device for a new energy uncertain power system, and belongs to the technical field of power system automation. Background technique [0002] With the rapid development of new energy installed capacity, the scale of new energy grid connection is gradually increasing, and the uncertainty of new energy output brings great challenges to the analysis and decision-making of power system security and stability. Traditional methods based on determinism are difficult to scientifically deal with the impact of uncertainty on the safe and economic operation of the system. By quantifying the possibility and severity of random events, risk theory can effectively measure the impact of uncertain factors on the overall system and ensure that the system is within an acceptable risk level. [0003] To deal with the uncertainty of new energy output, the confidence interval method or scenario method ...

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Problems solved by technology

[0006] Purpose: In order to overcome the problems in the prior art that the control cost of the robust optimization method is too large, the solution time of the stochastic optimization method is too long and it is difficult to determine the risk threshold for safe and stable operation of the system, the present invention provides a new energy uncertain power system Safety risk prevention control method and device

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