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A DC short-circuit fault ride-through control method for modular multilevel converters

A modular multi-level, DC short-circuit technology, applied in the field of power transmission and distribution, can solve the problem of not considering the single-pole grounding short-circuit fault of the MMC-HVDC system, and achieve the effect of improving the fault ride-through capability

Active Publication Date: 2020-06-23
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Documents (1) and (2) proposed corresponding fault ride-through control strategies for the MMC-HVDC system DC bipolar short-circuit fault scenario, but did not consider the single-pole grounding short-circuit fault of the MMC-HVDC system

Method used

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  • A DC short-circuit fault ride-through control method for modular multilevel converters
  • A DC short-circuit fault ride-through control method for modular multilevel converters
  • A DC short-circuit fault ride-through control method for modular multilevel converters

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Embodiment Construction

[0040] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] figure 1 is the topology of the MMC-HVDC system, and its MMC-HVDC system sub-modules are figure 2 The full-bridge submodule shown.

[0042] The short-circuit fault of the present invention is a single-pole grounding short-circuit fault that only occurs in one of the positive and negative poles. The control method involves the control of the fault-located pole and the control of the other pole opposite to the fault-located pole. The specific implementation steps are as follows:

[0043] (A) Assuming that a single-pole grounding short-circuit fault occurs in the positive pole of the MMC-HVDC system, the positive pole is the pole where the fault is located, and the control steps for the positive pole are as follows:

[0044] A1) Use the voltage Hall sensor to collect the three-phase voltage signal u of the AC grid abc , sub-module capa...

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Abstract

The invention discloses a ride-through control method applied to an enhanced Direct Current (DC) short-circuit fault of a Modular Multi-level Converter (MMC). The short-circuit fault is a single-polegrounded short-circuit fault occurred by only one pole in positive and negative poles, and the control method relates to the control of the pole where the fault is located and the control of the otherpole opposite to the pole where the fault is located. According to the method, not only is a control target of each of the positive and negative poles (the pole where the fault is located and the other pole) of a sending end and a receiving end when a Modular Multi-level Converter-High Voltage Direct Current (MMC-HVDC) system takes place a DC single-pole grounded short-circuit fault stated, but also a principle for configuring active and reactive powers is optimized; the capacity of the MMC-HVDC system can be fully used to provide active and reactive supports for a power grid, so that the MMC-HVDC can implement fault ride-through under the DC single-pole grounded short-circuit fault by fully using the own capacity; and thus, the fault ride-through capacity of the MMC-HVDC system under theDC single-pole grounded short circuit and the stable operation capacity of a connected alternating-current power grid thereof are improved.

Description

technical field [0001] The invention relates to flexible DC power transmission and distribution of power systems, in particular to a fault ride-through control method suitable for DC single-pole grounding short-circuit faults of modular multilevel converters, and belongs to the technical field of power transmission and distribution. Background technique [0002] Compared with traditional two-level and three-level converters, the Modular Multilevel Converter (MMC) has lower operating loss and higher output voltage waveform quality, and can be flexibly expanded by increasing the number of sub-modules. The voltage power level can effectively avoid a series of problems caused by the series use of a large number of switching devices, and has been widely used in the field of flexible direct current transmission. [0003] When a DC unipolar-to-ground short-circuit fault occurs in a modular multi-level converter-high voltage direct current (MMC-HVDC) transmission system, the pole no...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 姚骏裴金鑫王雪微骆悦张田
Owner CHONGQING UNIV
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