Alternating-current and direct-current parallel decentralized control method based on pi-type topological structure

Abstract

The invention provides an alternating-current and direct-current parallel decentralized control method based on a pi-type topological structure. The method comprises the steps of determining a transfer function of a system in the dynamic process and a transfer function of the system in the static process, identifying the transfer functions according to TLS-ESPRIT to obtain a system vibration mode, determining a feedback signal of a controller and a preliminary matching scheme of installation sites according to the system vibration mode, calculating an ERGA of a control loop according to the transfer functions and the preliminary matching scheme and determining a feedback signal of the controller and an optimal matching scheme of the installation sites according to the ERGA and the preliminary matching scheme. According to the alternating-current and direct-current parallel decentralized control method based on the pi-type topological structure, the system vibration mode is analyzed through TLS-ESPRIT, the feedback signal of the controller and the preliminary matching scheme of the installation sites are determined, and the optimal matching scheme is determined through ERGA indexes. According to the ERGA, interaction of the dynamic condition and the static condition is considered, uncertainty of the system is reduced, control reliability is improved, robustness of a control device is improved, the cost is reduced, low frequency oscillation of large power grid areas in an alternating-current and direct-current parallel power transmission system is inhibited, and the method is suitable for various types of controllers.

Description

technical field [0001] The invention relates to the technical field of control methods, in particular to an AC / DC parallel decentralized control method based on a π-type topology. Background technique [0002] AC-DC parallel transmission is a way to transmit electric energy in parallel with high-voltage AC lines and high-voltage DC lines. Various control devices are connected to both ends of the high-voltage AC line and the high-voltage DC line, and the various control devices can realize the transmission of current through cooperation with each other. [0003] When AC-DC parallel transmission is used for long-distance transmission of electric energy, if the control equipment on the DC side and the AC side do not cooperate with each other, new vibration modes may be excited due to resonance and other reasons, thereby affecting the quality of the transmitted electric energy. Therefore, it is usually necessary to pay attention to the coordination relationship between the DC s...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an AC-DC parallel decentralized control method based on π-type topology, which solves the problem in the prior art that...

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