Differential flatness control method of MMC-HVDC for supplying power to passive network under asymmetric fault

A MMC-HVDC, differential flat technology, applied in AC network circuits, geometric CAD, power transmission AC networks, etc., can solve problems such as difficulty in detecting output current

Pending Publication Date: 2020-11-20
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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  • Application Information

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Problems solved by technology

Since various asymmetric faults often occur in the power system, it will become more difficult to accurately detect the output current when a transient fault occurs

Method used

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  • Differential flatness control method of MMC-HVDC for supplying power to passive network under asymmetric fault
  • Differential flatness control method of MMC-HVDC for supplying power to passive network under asymmetric fault
  • Differential flatness control method of MMC-HVDC for supplying power to passive network under asymmetric fault

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Embodiment Construction

[0082] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0083] The invention relates to a control method for an MMC-HVDC supplying power to a passive network under asymmetric faults, the method comprising the following steps:

[0084] Step 1: The structure and working principle of the MMC-HVDC system for supplying power to the passive network are:

[0085] figure 1 MMC-HVDC system structure diagram for passive power supply. It can be seen from the figure that the MMC converter station on the left ...

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Abstract

The invention relates to a differential flatness control method of MMC-HVDC for supplying power to a passive network under an asymmetric fault. The method comprises the following steps: 1) analyzing astructure and a working principle of an MMC-HVDC system for supplying power to the passive network; 2) establishing a mathematical model based on a positive and negative sequence system for the MMC converter of the HVDC rectifier stage when the power grid voltage is unbalanced; 3) taking the output variables as active power and reactive power, and analyzing the stability of the MMC system; and 4)designing the positive and negative sequence control of the inner and outer rings of the MMC-HVDC converter station according to the differential flatness theory. The method provided by the inventionis suitable for the conditions of normal operation of a power grid and a power grid voltage fault, is quick in dynamic response, is wide in application range, can solve problems that the detection precision of an output current is not enough and the dynamic performance of an MMC converter becomes poor when an asymmetric fault happens to the power grid, and effectively improves the stability of anMMC-HVDC system.

Description

technical field [0001] The invention relates to the technical field of MMC-HVDC control, in particular to a differential flattening control method for MMC-HVDC supplying power to a passive network under asymmetric faults. Background technique [0002] Modular Multilevel Converter (MMC) has attracted extensive attention as a power converter topology used in high power and high voltage systems. Due to its advantages such as small output harmonics, low power loss and modularity, it has become the first choice for high-voltage direct current (HVDC) system converters. [0003] However, when the HVDC system operates normally, it is likely to encounter faults such as phase-to-ground or voltage sag of the three-phase power grid, which seriously affects the stability and security of the power system. With the rapid development of the power system and the construction of the ubiquitous power Internet of Things, higher requirements have been placed on the transmission capacity and sta...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02J3/00G06F30/18G06F30/20G06F113/04
CPCH02J3/36Y02E60/60
Inventor 程启明赵淼圳马信乔江畅程尹曼
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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