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Control parameter optimization design method for multi-terminal flexible direct-current power transmission system

A DC transmission control, multi-terminal flexible technology, applied in computing, data processing applications, power transmission AC network, etc., can solve problems such as difficulty in setting parameters

Active Publication Date: 2020-07-31
XI AN JIAOTONG UNIV
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  • Claims
  • Application Information

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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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  • Control parameter optimization design method for multi-terminal flexible direct-current power transmission system
  • Control parameter optimization design method for multi-terminal flexible direct-current power transmission system
  • Control parameter optimization design method for multi-terminal flexible direct-current power transmission system

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Embodiment Construction

[0068] In order to make the purpose, 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 in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to 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 a modular multi-level converter station main circuit, a control system, a direct current line and an alternating current system; the method includes th...

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Abstract

The invention discloses a multi-terminal flexible direct-current power transmission control parameter optimization design method. The method comprises the steps of building a small signal model of a flexible direct-current power transmission system, wherein the small signal model comprises a main system model and a control system model; and establishing an optimal control parameter design problemtaking the characteristic value as a target function, and solving the optimal control parameter design problem taking the characteristic value as the target function by adopting an optimization algorithm based on sensitivity analysis to obtain an optimal control parameter. According to the method, the step length of each iteration can be determined through backtracking line search, iterative oscillation is prevented, and the convergence speed is increased; since the search direction and the step length are determined according to the sensitivity of the control parameters, the result of each iteration can monotonously approach the optimal solution in the optimization process, 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 of a multi-terminal flexible direct current transmission system. Background technique [0002] Modular multilevel converter based high voltage direct current (MMC-HVDC) is suitable for integrated The advantages of different types of energy sources have been widely used in the field of power transmission. Because of the ability to change the direction of the power flow without changing the polarity of the voltage, 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 the d-q decoupling control strategy to control the power or voltage of the converter station, which is usually implemented by a proportional-integral controller. ...

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Application Information

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IPC IPC(8): H02J3/36G06Q10/04G06Q50/06
CPCH02J3/36G06Q10/04G06Q50/06Y02E60/60
Inventor 秦博宇刘宛菘孙沛李景王楷刘佳玲
Owner XI AN JIAOTONG UNIV
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