Safety and stability control system strategy making method considering cluster power coefficient

Abstract

The invention belongs to the technical field of power system safety and stability control. The invention discloses a safety and stability control system strategy making method considering a cluster power coefficient. The method comprises the steps that firstly, the generator tripping amount upper limit, the generator tripping threshold, the generator tripping coefficient and the unit power coefficient are calculated respectively, then the obtained relation among the generator tripping amount upper limit, the generator tripping threshold, the generator tripping coefficient and the unit power coefficient is analyzed; multiple sets of strategy constant values are combined in a special mode; and a safe and stable control strategy is simplified. The method is used for realizing minimum accurategenerator tripping when a power system has a serious fault; different generator tripping characteristic differences of different generator groups are considered; the influence of the difference on safety control strategy making is qualitatively and quantitatively analyzed; the problems of large overcut amount and large generator tripping error caused by determining the generator tripping amount by a unit with the worst generator tripping effect in an existing safety control strategy setting method are fundamentally solved; and making of a constant value strategy can be effectively simplifiedthrough a provided special mode combination method.

Description

technical field [0001] The invention belongs to the technical field of power system safety and stability control, and relates to a method for formulating a strategy for a safety and stability control system, in particular to a method for formulating a strategy for a safety and stability control system considering the power coefficient of a cluster. Background technique [0002] The "three lines of defense" of the power system is a successful experience in ensuring the safe and stable operation of the power grid in my country. Among them, the "second line of defense" uses safety and stability control devices to implement emergency control measures such as cutting machines and loads to ensure the safety of the power grid in the event of a serious failure. Stable operation. At present, there have been related researches on the formulation of control strategies for safety and stability control systems in China. For the dynamic stability of the power grid, one is based on the piec...

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Problems solved by technology

At present, there have been related researches on the formulation of control strategies for safety and stability control systems in China. For the dynamic stability of the power grid, one is based on the piecewise function method. To formulate a cut-off strategy, but this method has the disadvantages of large amount of calculation, large amount of overcut, and a large number of fixed value groups; one is to study the linear fitting of the relationship between the section power flow and the cut-off amount by the least square method, Formulate a linear cut-off strategy, but there are problems of large overcut and low cut-off accuracy; there is also a study to establish a linear model that reflects the relationship between the cut-off amount of the power grid and the section power flow with modifiable parameters. The segment function method reduces the calculation amount of the strategy setting value and the overcut amount when executing the strategy to a certain extent. However, this method does not consider the influence of different unit cut-off sensitivities on the cut-off slope. In order to ensure the system stability margin, The unit with the worst cutting effect is used to calculate the required cutting amount. When performing machine cutting, the unit with the best cutting effect is given priority. Therefore, there is a large amount of overcut, which affects the execution accuracy of the strategy and causes a large cutting error.

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