A Robust Optimal Control Method for AC-DC Hybrid Power Grid Considering Multi-state Switching

Abstract

The invention discloses an alternating-current-direct-current hybrid power grid robust optimal control method considering multi-state switching. The method comprises the steps of defining a state coordinate system of an alternating-current-direct-current multi-area parallel system; defining a virtual control law based on actual control input signals, and then obtaining an inertia center multi-state Markov state module of the whole alternating-current-direct-current system based on equivalent damping errors and outside interference coefficients, direct current system equivalent errors and outside interference coefficients, uncertain random jamming, and equivalent damping coefficients under inertia center coordinates; using a Lie derivative of a Lyapunov function of the inertia center multi-state Markov state module to replace uncertain random jamming to obtain an auxiliary module of the inertia center multi-state Markov state module; obtaining a target control law when the auxiliary module is asymptotically stable according to the probability, obtaining the actual control input signals according to the target control law, and using the actual control input signals to achieve alternating-current-direct-current hybrid power grid robust optimal running. According to the alternating-current-direct-current hybrid power grid robust optimal control method considering multi-state switching, the system robust stability is improved, and the system running performance is optimal.

Description

technical field [0001] The invention belongs to the field of research on control methods for the stability and optimal operation of AC / DC hybrid power grids, and more specifically relates to a robust optimal control method for AC / DC hybrid power grids considering multi-state switching. Background technique [0002] my country's energy resources and energy demand present a remarkable feature of reverse distribution: coal, hydropower, wind and other resources are mainly concentrated in the western region, and their share has reached more than 80%; while the central and eastern provinces and cities are economically developed and have a concentrated population, and their energy consumption exceeds 75% of the country. Since DC transmission has the characteristics of long transmission distance, large transmission capacity, low loss, and small footprint of the converter station, it has significant advantages especially for long-distance and large-capacity power transmission. Since ...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a robust and optimal control method for the AC / DC hybrid power grid considering multi-state switching, thereby solving the problem that the prior art cannot fully cover the operating states of the system, when When the system state changes too much, effective control cannot be carried out, and it may even aggravate the technical problem of system deterioration

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