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An optimal design method for control parameters of a multi-terminal flexible HVDC transmission system

A technology for DC transmission control and DC transmission system, applied in computing, data processing applications, power transmission AC networks, etc., can solve problems such as difficulty in setting parameters, and achieve the effects of improving dynamic response, improving stability, and shortening recovery time.

Active Publication Date: 2022-08-09
XI AN JIAOTONG UNIV
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Problems solved by technology

Due to the interaction between multiple controllers, it is very difficult to tune parameters using traditional trial and error methods

Method used

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  • An optimal design method for control parameters of a multi-terminal flexible HVDC transmission system
  • An optimal design method for control parameters of a multi-terminal flexible HVDC transmission system
  • An optimal design method for control parameters of a multi-terminal flexible HVDC transmission system

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Embodiment Construction

[0068] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are disclosed. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0069] see Figure 10 , a multi-terminal flexible direct current transmission control parameter optimization design method of the present invention, the multi-terminal flexible direct current transmission system includes the main circuit of the modularized multi-level converter station, the control system, the direct current line and the alternating current system; the method include...

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Abstract

A multi-terminal HVDC flexible transmission control parameter optimization design method, establishes a small signal model of the flexible HVDC transmission system, the small signal model includes the main system model and the control system model; establishes the optimal control parameter design problem with the eigenvalue as the objective function, using The optimization algorithm based on sensitivity analysis solves the optimal control parameter design problem with the eigenvalues ​​of the objective function, and obtains the optimal control parameters. The invention can also use backtracking line search to determine the step size of each iteration, prevent iterative oscillation, and improve the convergence speed. Since the search direction and step size are determined according to the sensitivity of the control parameters, in the optimization process, the results of each iteration can monotonically approach the optimal solution, thereby improving the stability of the system.

Description

technical field [0001] The invention belongs to the technical field of power system safety and control, and in particular relates to a control parameter optimization design method for a multi-terminal flexible direct current transmission system. Background technique [0002] Modular multilevel converter based high voltage direct current (MMC-HVDC) system has no commutation failure problem, lower switching frequency, output waveform closer to sinusoidal, suitable for integration The advantages of different types of energy, etc., have been widely used in the field of power transmission. Because of its ability to change the direction of the power flow without changing the voltage polarity, MMC-HVDC can form a multi-terminal direct current (MTDC) grid to improve the reliability of the power system. There are several MMC-MTDC projects under construction or put into production. [0003] The MMC control system adopts a d-q decoupling control strategy to control the power or volta...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36G06Q10/04G06Q50/06
CPCH02J3/36G06Q10/04G06Q50/06Y02E60/60
Inventor 秦博宇刘宛菘刘佳玲
Owner XI AN JIAOTONG UNIV
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