Multi-round low-frequency load reduction simulation calculation method and system for power grid

Abstract

The invention belongs to the technical field of on-line stimulation for third-defense-line control measures of a power grid, and more specifically relates to a multi-round low-frequency load reductionsimulation calculation method for the power grid. The method specifically comprises a first round and a second round. The first round includes the steps of first, calculating a frequency curve by using transient stability calculation, obtaining high-precision frequency offset and the duration after the power grid breaks down, and matching with a low-frequency load reduction strategy to reach loadreduction requirements of the next round; second, calculating the load capacity should be shed according to the low-frequency load reduction strategy, configuring the load capable of being shed whenload shedding is performed, and preferentially removing the interruptible load; and third, calculating the power flow again, and entering the second round after the convergence. In the second round, the operation and calculation process in the first round is repeated. The method realizes modeling for three defense lines in an on-line calculation program of the power grid for the first time, achieves a function of multi-round low-frequency load reduction and a function that the three defense lines are stably controlled by an electric power system, and improves the calculation accuracy of the simulation program when the power grid breaks down.

Description

technical field [0001] The invention belongs to the technical field of online simulation of control measures for the third line of defense of a power grid, and more specifically relates to a multi-round low-frequency load shedding simulation calculation method for a power grid. Background technique [0002] With the rapid development of AC-DC hybrid power grid, the structure of China's power grid has been in a transitional period for a long time. The operation characteristics of the power grid are complex, and the safety and stability of the power grid is highly dependent on the security control system, which has a wide coverage and complex functions. Taking a provincial power grid as an example, at the end of 2012, there were 10 safety control systems and 90 sets of safety control devices. [0003] In order to grasp the operation status of the security control system in time, Jiangsu, Sichuan, Guangdong and other provincial-level and above dispatching agencies have built a...

AI Technical Summary

Problems solved by technology

However, there is still a lack of online evaluation functions for the monitoring, implementability and control effects of the on-duty control measures of the security control system

[0004] Due to the different dispatching management modes in foreign countries, most of them adopt the mode of regional power market, which is different from the current integrated operation mode of national dispatching and sub-dispatching, so there is no mature experience for reference

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