On-line additional emergency control method for power system safety and stability based on off-line strategy

Abstract

The invention discloses a safe stable on-line additional emergency control method of a power system, and belongs to the technical field of safe stable emergency control of the power system. The method disclosed by the invention comprises the following steps: generating safe stable electric network operating fault surface data which is assessed on line by using safety control real-time information as a standard, performing an on-value control measure of an off-line strategy, in the measure space of additional control, generating safe stable on-line assessment calculation examples through the enumerated combination of the control measure, based on a cluster calculating platform, preferentially processing the calculation examples with a small control cost, updating the additional control measure combination which has a small control cost and can ensure the safety and the stability of the electric network to a safety control device, and after an expected failure occurs, implementing the on-value control measure and the on-line additional control measure of the off-line strategy at the same time for the electric network. The method disclosed by the invention can effectively reduce the probability that the safety and the stability of the electric network cannot be ensured after emergency control.

Description

technical field [0001] The invention belongs to the technical field of safety and stability emergency control of electric power system. More precisely, the invention relates to an online additional emergency control method based on the off-line strategy of power system safety and stability emergency control. Background technique [0002] Security and Stability The emergency control system (referred to as the security control system) is the second line of defense for the security and stability of the power grid, and has high reliability requirements. In order to adapt to the complex operating conditions of the power grid, through a large number of security and stability analysis and calculation of the power grid, combined with engineering experience, the off-line control strategy table is formulated according to the conservative principle. Usually, the safety control system controlled based on the offline control strategy table can ensure the safety and stability of the power...

AI Technical Summary

Problems solved by technology

Normally, the security control system based on the offline control strategy table can ensure the safety and stability of the power grid after the expected fault occurs, but there is still the possibility of mismatching with the actual operating conditions of the power grid and failing to meet the safety and stability requirements of the power grid

As the scale of the power grid increases, the operating characteristics of the power grid will become more complex, the possibility of mismatch between the offline control strategy and the actual operating conditions of the power grid will increase, and the risk of safe and stable operation of the power grid will also increase.

[0003] In order to overcome the inherent shortcomings of the offline control strategy, the "online pre-decision, real-time matching" emergency control technology has been applied in some engineering applications in domestic and foreign power grids. Due to the safety and stability of large power grids, the calculation time of "online pre-decision" usually takes several minutes , and the operating conditions of the large power grid may change greatly within a few minutes, and the online emergency control strategy obtained through online calculation may also not match the actual operating conditions of the power grid, and may not meet the safety and stability requirements of the power grid. , but it is less likely than the off-line control strategy

One of the key factors affecting the popularization and application of "online pre-decision, real-time matching" emergency control technology is that it is difficult to quantitatively evaluate the adaptability of online strategies. Usually, the applicable conditions of online strategies are pre-set by experience, and its reliability is difficult to guarantee.

[0004] In summary, emergency control based on offline strategy can ensure the safety and stability of the power grid under most operating conditions of the power grid, but the accuracy of the control strategy is not high, usually too conservative, and the amount of control is too large; emergency control based on online pre-decision The strategy has high accuracy, but its reliability still depends on experience

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