Inter-region mode damping improvement method based on generator active power modulation

Abstract

The invention discloses an inter-region mode damping improvement method based on generator active modulation, and belongs to the technical field of power system operation and maintenance. According to the method, a subspace dynamic mode decomposition method (Sub-DMD) is used for extracting an active power participation factor of the generator on line, the participation degree of active power output of the generator in an electromechanical mode is quantified on line, and the positions of parametric generator sets in a sending end area and a receiving end area are accurately positioned in combination with a system modal shape extracted by the Sub-DMD. And the active power output limit and the actual operability of the generator are considered, and the active power modulation quantity of the parametric generator set is reasonably determined. According to the active adjustment principle that the power of the sending-end machine group is reduced while the power of the receiving-end machine group is increased, the mode damping ratio between the system regions is effectively improved online, a reasonable auxiliary decision is provided for guiding system operation by dispatching operation personnel, and the method has important significance for guaranteeing safety and stability of the electric power system. The method disclosed by the invention has very high practical application value.

Description

technical field [0001] The invention belongs to the technical field of power system operation and maintenance, and in particular relates to an inter-regional mode damping boosting method based on generator active power modulation. Background technique [0002] With the rapid development of the power system, the gradual formation of cross-regional UHV AC and DC hybrid transmission grids, and the construction and operation of large-scale new energy bases, the operation risks and control difficulties brought by low-frequency oscillations have increased. For the interconnected power grid, after the startup mode, grid structure and auxiliary control measures are determined, the size of the inter-regional power transmission is the key factor determining the mode damping between regions. The generator active power open-loop modulation strategy reduces the transmission power of the inter-region tie line by adjusting the active power output of the generator set in the sending-end reg...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an inter-area mode damping improvement method based on generator active power modulation to solve the problem of high dimensionality of the system model constructed in the prior art in order to realize the effective improvement of the system damping ratio, and the calculation is complicated , there are great limitations in online applications; and the damping ratio sensitivity technology based on measurement data, the accuracy of calculation results is highly dependent on the accuracy of measurement data, and cannot be applied to new energy power systems with high proportion of power electronics. technical problem

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