Multi-section online stability limit calculation method and system based on sensitivity analysis

Abstract

The invention discloses a multi-section online stability limit calculation method and system based on sensitivity analysis. The method comprises the steps of acquiring power transmission section composition branch information, determining a tide direction and a corresponding power vector of each branch according to the power transmission section composition branch information, and distinguishing asending end area and a receiving end area of a power transmission section; performing network topology analysis on a power grid, and determining a receiving-end generator node set and a sending-end generator node set; calculating the comprehensive sensitivity of each node in the receiving-end generator node set and the sending-end generator node set, and screening to generate a power grid unit output adjustment strategy; calculating section active power flow according to the unit output adjustment strategy; checking whether thermal stability out-of-limit exists in the section limit power flowor not; and if not, determining a stable limit according to the section active power flow. The method and the system do not need to depend on offline calculation experience of scheduling experts, andcan effectively adapt to real-time change of a power grid operation mode.

Description

technical field [0001] The present invention relates to the field of electric power technology, and more specifically, to a multi-section online stability limit calculation method and system based on sensitivity analysis. Background technique [0002] The power of the key transmission section is the operation data that dispatchers are most concerned about, and it is also an important means to control the stability of the operation mode. The closeness between the actual power of the transmission section and the stability limit power directly reflects the stability level of the system, and the transmission limit of the transmission section is solved online It is of great significance to measure the stability of the system and tap the potential of power transmission. The transmission limit of the transmission section is the maximum power transmission capacity of the power system on the specified transmission path without violating thermal overload, node voltage overrun, voltage...

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Problems solved by technology

[0004] In order to solve the problem that the existing power transmission section stability margin assessment in the background technology cannot adapt to the current real-time changing power grid operation status, the present invention provides a multi-section online stability limit calculation method and system based on sensitivity analysis; the method and By calculating the comprehensive sensitivity of each generator node, the system screens and adjusts the output of the generators at the receiving end and the generators at the sending end in the power grid, and through the power flow N-1 verification, judges in real time whether the thermal stability of the limit power flow of the section exceeds the limit, and determines Stability limit; the multi-section online stability limit calculation method based on sensitivity analysis, comprising:

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