Method for designing MMC-HVDC controller

A design method and controller technology, applied in the direction of AC network circuits, circuit devices, power transmission AC networks, etc., can solve the problems of poor robustness of dynamic response performance, etc., and achieve strong dynamic response ability, chattering suppression, and easy parameters Effect

Active Publication Date: 2019-03-26
TIANJIN UNIV
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  • Abstract
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Problems solved by technology

[0004] In order to overcome the problems of poor dynamic response performance and robustness in the conventional MMC-HVDC control system in the prior art, the present invention proposes a MMC-HVDC controller design

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  • Method for designing MMC-HVDC controller
  • Method for designing MMC-HVDC controller
  • Method for designing MMC-HVDC controller

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Embodiment Construction

[0056] The technical solutions of the present invention will be further described in detail below in conjunction with examples.

[0057] Such as figure 1 Shown is the structure diagram of the single-side converter station system. On the basis of the basic topology of the MMC converter, the neutral point of the AC and DC sides is considered, and the reference direction of the current at the outlet of the converter is from the DC side to the AC side. The neutral point on the DC side is represented by point O, and the neutral point on the AC side is represented by point O’. Resistance R 0 is the equivalent loss of the whole bridge arm (the loss of each bridge arm is regarded as approximately the same), L 0 is the arm reactor; R ac and L ac are the equivalent resistance and inductance of the AC side, respectively; u pk and u nk (k=a, b, c) are respectively the bridge arm voltages of all submodules of the upper and lower bridge arms; i pk and i nk are the currents flowing ...

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Abstract

The invention discloses a method for designing a MMC-HVDC controller. The method comprises the steps of (1) establishing a mathematical model of a MMC in a synchronous rotating coordinate system withthe combination of the working principle of a MMC-HVDC, (2) designing a unified inner loop current controller based on sliding mode variable structure control with the combination of the mathematicalmodel of the MMC, (3) designing a DC voltage controller model, (4) designing a power controller model, and (5) designing a DC voltage droop controller model. Compared with the prior art, the method has the advantages of simple algorithm, high control precision, strong dynamic response ability to a direct current transmission system, good stability, easy parameter debugging, strong robustness and low dependence on the mathematical model of the system, and on the other hand, the method has important application significance to promote the development of related industries.

Description

technical field [0001] The invention belongs to the field of direct current transmission of power systems, and more specifically relates to a design method of an MMC-HVDC controller based on sliding mode variable structure control technology. Background technique [0002] Compared with the traditional two- and three-level VSC converters, the modular multilevel converter (MMC) with multi-module series design and step wave approximation technology has the advantages of high waveform quality, low switching frequency and low loss cost. It has the advantages of low multiplier reduction, low manufacturing difficulty, strong fault handling capability, and good scalability. It has received widespread attention in the field of high-voltage direct current transmission (HVDC) and is increasingly used in actual direct current transmission projects. middle. [0003] MMC is an important part of DC transmission system, and its control strategy is crucial to the stable operation of the who...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 李斌关天一
Owner TIANJIN UNIV
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