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A Method for Capacitor Voltage Equalization of Power Module of Flexible DC Converter Valve

A power module and capacitor voltage technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., can solve the problems of control system design difficulty and cost increase, and reduce the difficulty of implementation and technology Requirements, reduce the overall cost, and reduce the amount of uploaded data

Active Publication Date: 2021-11-16
XIDIAN POWER RECTIFIER XIAN +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes the design of the control system more difficult and costly.

Method used

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  • A Method for Capacitor Voltage Equalization of Power Module of Flexible DC Converter Valve
  • A Method for Capacitor Voltage Equalization of Power Module of Flexible DC Converter Valve
  • A Method for Capacitor Voltage Equalization of Power Module of Flexible DC Converter Valve

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Experimental program
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Embodiment Construction

[0030] The present invention will be further described below.

[0031] The present invention comprises the following steps:

[0032]S1. Arrange the input power modules according to the input sequence to generate an input sequence; the input power modules can be arranged in the following two ways:

[0033] The first one is to put the power module that is put in first at the front of the queue, and the modules that are put in later are placed in the back row according to the order of putting in, and the last one is the power module that is put in last;

[0034] The second is to put the module that is put in last at the front of the queue, and the modules that are put in first are placed in the back row according to the order of putting in, and the last module is the power module that is put in first.

[0035] S2. Arrange the removed power modules in sequence to generate a removal sequence; the removed power modules can be arranged in the following two ways:

[0036] The first ...

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Abstract

The invention discloses a capacitor voltage equalization method for a power module of a flexible DC converter valve. According to the input and removal sequence of the power module and the capacitor voltage state of the power module, the invention generates an input sequence and a removal sequence; and then according to the bridge arm current, Switching requirements and pressure equalization effect requirements, according to the set exchange rules, select the corresponding modules in the input sequence and removal sequence to exchange input and removal states, and generate new input sequences and removal sequences. The present invention does not require the module capacitor voltage, so there is no requirement for the real-time performance of the module capacitor voltage. It only needs the module to upload the over-limit information when the capacitor voltage exceeds the limit, and the amount of data uploaded by the module is greatly reduced, thus requiring no higher The communication data rate can meet the system performance design requirements. The invention provides feasibility for the intensive scheme of the valve control system, reduces the difficulty and technical requirements of the intensive scheme of the valve control system, and reduces the overall cost of the valve control system at the same time.

Description

technical field [0001] The invention belongs to the field of flexible direct current transmission, and in particular relates to a method for equalizing capacitor voltage of a power module of a flexible direct current converter valve. Background technique [0002] Flexible DC transmission technology is a new type of DC transmission technology based on fully controlled power electronic devices, voltage source converters and pulse width modulation technology. In 1990, Canada's Boon-Teck Ooi and others first proposed the high-voltage direct current transmission technology (VSC-HVDC) based on the voltage source converter, which is called flexible direct current transmission technology in China. In 1997, the world's first flexible DC transmission experimental project—— The project (10kV, 3MW) was completed and put into operation. In 2001, German scholar Rainer Marquardt proposed a modular multilevel converter technology. In 2010, the world's first flexible DC transmission proj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 李宾宾楚遵方李少华娄彦涛李延龙涂小刚姚东晓常立国马小婷
Owner XIDIAN POWER RECTIFIER XIAN
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