New energy acceptance capability and minimum startup evaluation method based on transient safety margin

Abstract

The invention discloses a new energy acceptance capability and minimum startup evaluation method based on transient safety margin. Sensitivity indexes for new energy output changes and conventional unit output changes are established respectively based on transient voltage safety margin quantization information. Under the constraint of the section quota of a power grid, the power supply organization form is coordinated based on the sensitivity indexes. The maximum output of the new energy of a system and the minimum startup mode of a conventional power supply for ensuring new energy transientvoltage safety under a bundling new energy delivery direct current fault are acquired. System chain reaction caused by new energy transient over-voltage disconnection is avoided. Decision guidance isprovided for dispatch and operation of the power grid.

Description

technical field [0001] The invention relates to a new energy acceptance capacity and minimum start-up evaluation method based on a transient safety margin, and belongs to the technical field of power system operation control. Background technique [0002] Voltage is not only related to the safe and stable operation of the power grid, but also one of the important indicators of power quality. Nowadays, more attention is paid to voltage security. Facing the new situation of power structure and grid structure changes, voltage security issues are facing more severe challenges. [0003] Usually the requirement for transient voltage safety can be determined based on a given voltage offset threshold V cr and the duration of voltage abnormality deviated from this given value constituted by t cr A binary table to describe (V cr , t cr ), if and only if the voltage deviates (lower than low frequency safety assessment, higher than high frequency safety assessment) V cr lasts longe...

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Problems solved by technology

[0004] At present, the research on the minimum start-up method still lacks a comprehensive, in-depth and systematic method. Most of them focus on the peak-shaving capability and power balance constraints as the main means. When a serious fault occurs in the power grid, the transient voltage security cannot be fully satisfied. It is easy to cause new energy to be disconnected from the grid; a small number of studies consider the safety constraints of transient voltage, but only consider the sensitivity ranking of conventional units to transient voltage rise, ignoring the contribution of new energy output to transient voltage at different locations, and cannot achieve new Maximize energy delivery

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