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Modular multi-level converter control method, device and apparatus

A modular multi-level, control method technology, applied in circuit devices, output power conversion devices, power transmission AC networks, etc., can solve the problems of classical decoupling control deteriorating power oscillation, etc., to solve power oscillation and improve stability. sexual effect

Inactive Publication Date: 2018-12-28
GUANGDONG POWER GRID CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The embodiment of the present application provides a modular multilevel converter control method, device and equipment method, related equipment and system, which solves the technical problem that the classic decoupling control may worsen the power oscillation

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  • Modular multi-level converter control method, device and apparatus
  • Modular multi-level converter control method, device and apparatus
  • Modular multi-level converter control method, device and apparatus

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Embodiment Construction

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0048] This application designs a modular multilevel converter control method, device and equipment,

[0049] For ease of understanding, see figure 1 , figure 1 The method flow chart of the first specific embodiment of the modular multilevel converter control method provided by this application specifically includes:

[0050] Step 101, collecting the voltage sig...

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Abstract

The embodiment of the application discloses a modular multi-level converter control method, device and apparatus. The method includes: collecting voltage signals and current signals of a transformer network side and performing coordinate transformation. The instantaneous real power and the instantaneous imaginary power are calculated by the formula of instantaneous power. The power reference valueof the converter is obtained, and the difference between the power reference value and the instantaneous power obtained before is calculated, and the PI control is carried out to obtain the power compensation value; and then the compensation voltage value is calculataed by the compensation voltage calculation formula; at last, the compensate voltage is fed forward to obtain the voltage expectation value, and the voltage expectation value is inversely converted and output, so that the power oscillation can be restrained, the stability of the HVDC transmission system can be improved, and the technical problem that the power oscillation may be deteriorated by the classical decoupling control in the prior art can be solved.

Description

technical field [0001] The present application relates to the technical field of electrical engineering, in particular to a control method, device and equipment for a modular multilevel converter. Background technique [0002] The flexible DC transmission technology based on modular multilevel converters has developed rapidly due to its advantages of high modularity, low switching loss, and highly decoupling control of active and reactive power. Weak power grids and asynchronous power grids have major advantages in networking, and are an important part of future smart grids and global energy internet. Reasonable selection of the control strategy of the converter has important practical significance for improving the economy of the power system and ensuring the safe operation of the power system. [0003] However, the fast response characteristics of power electronic equipment may induce subsynchronous oscillation of the power grid, and the complex internal structure of the ...

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Application Information

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IPC IPC(8): H02M7/483H02J3/24H02J3/36
CPCH02J3/24H02J3/36H02J2003/365H02M7/483Y02E60/60
Inventor 陈卉灿喻建瑜徐春华刘崇茹包博刘昊宇王宇王洁聪凌博文谢国超徐诗甜
Owner GUANGDONG POWER GRID CO LTD
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