Valve base control device and method for modular multilevel converter
A valve-based control device, modularized multi-level technology, applied in power transmission AC network, high-efficiency power electronic conversion, conversion of AC power input to DC power output, etc. It can improve reliability and stability, reduce load, and avoid errors in judgment.
Active Publication Date: 2015-11-25
STATE GRID CORP OF CHINA +2
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Problems solved by technology
But this invention is not suitable for large-capacity MMC flexible DC transmission technology and engineering with a huge number of modules
Because in the large-capacity MMC flexible DC transmission project, the number of modules is huge, sometimes a single bridge arm has hundreds of independent sub-modules, and it is difficult to realize the control and protection of the sub-modules of the same bridge arm in the same control unit
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[0028] The present invention will be described in detail below with reference to the accompanying drawings, but such illustration and description are to be considered illustrative and exemplary and not restrictive; the invention is not limited to the disclosed embodiments. Any reference signs in the claims should not be construed as limiting the scope.
[0029] figure 1 It is a schematic diagram of a typical structure of the MMC flexible direct current transmission system at both ends. Among them, the converter stations on both sides of the system connected to the AC system 1 at both ends adopt MMC converters, and the converter station equipment includes MMC converters 4, valve reactors 3, connection transformers 2, DC grounding devices 5 and DC cables 6 . In the back-to-back two-terminal MMC-HVDC, the DC cable 7 may not be included. Among them, the converter 4 is the most core device, which is formed by cascading multiple identical converter sub-modules.
[0030] figure...
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A valve base control device and method for a modular multi-level convertor (4). The modular multi-level convertor (4) is provided with a bridge arm comprising a plurality of cascaded submodules. The valve base control device comprises the following components constructed in a hierarchical control architecture: a current control unit which is used for realizing the current control of a convertor and the real-time generation of the input number of bridge arm submodules, acquiring the current direction of the bridge arm, and sending number information and current direction information; a bridge arm collection control unit which is used for determining submodules to be input or cut out according to the received state of each submodule and the number information and the current direction information which are received from the current control unit, and sending a determination result; and a bridge arm subsection control unit which is used for realizing the input or cut out of each submodule according to the determination result received from the bridge arm collection control unit, and acquiring the state of each submodule and sending same to the bridge arm collection control unit. The above-mentioned hierarchical control architecture disperses the functions of the valve base control device for a convertor to a plurality of hardware devices, so as to reduce the load of a single hardware device.
Description
technical field [0001] The present invention generally relates to the technical field of high-voltage direct current transmission, and more specifically, relates to a converter valve base control device and a corresponding method used in a flexible direct current transmission system of a high-voltage large-capacity modular multilevel converter. Background technique [0002] Flexible DC transmission technology (HVDC Flexible) is a new type of DC transmission technology based on turn-off devices, pulse width modulation (PulseWidthModulation, PWM) technology and voltage source converter. The Modular Multilevel Converter (ModuleMultilevelConvertor, MMC) uses a multilevel ladder wave to directly fit the sine wave, which can greatly reduce the harmonic content and loss of the converter in high-voltage and large-capacity applications. Currently, the converter topology is most commonly used in the field of flexible direct current transmission technology. [0003] MMC flexible direc...
Claims
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IPC IPC(8): H02J3/36H02M1/08
CPCH02M7/483H02J3/36H02M2007/4835Y02B70/16Y02E60/60H02M1/0003H02M7/4835
Inventor 汤广福谢敏华姜喜瑞高阳王韧秋杨岳峰庞辉路建良杨兵建
Owner STATE GRID CORP OF CHINA