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Modular multilevel converter system and control system and control method thereof

A modular multi-level, control system technology, applied in the field of power conversion, can solve the problems of different functions, different control system implementation methods, etc.

Active Publication Date: 2014-02-05
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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Problems solved by technology

However, this application only introduces the specific control system and implementation method of the bridge arm unit submodule of the converter, and does not describe it from the system levels of the converter's AC side, DC side, digital quantity, and analog quantity. The proposed control systems are implemented in different ways and have different functions

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  • Modular multilevel converter system and control system and control method thereof
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[0047] For the sake of reference and clarity, the technical terms, abbreviations or abbreviations used below are recorded as follows:

[0048] MMC: Modular Multilevel Converter, the abbreviation of Modular Multilevel Converter;

[0049] SM: Sub Modular, the abbreviation of sub-module;

[0050] IGBT: Insulated Gate Bipolar Transistor, short for insulated gate bipolar transistor;

[0051] A / D: analog / digital conversion;

[0052] SCU: System Control Unit, the abbreviation of System Control Unit;

[0053] VCU: Valve Control Unit, the abbreviation of Valve Control Unit.

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but ...

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Abstract

The invention discloses a modular multilevel converter system and a control system and control method of the modular multilevel converter system. An upper computer control layer comprises an operation personnel monitoring system, wherein the operation personnel monitoring system is connected with a system control unit. A system-level control layer comprises the system control unit, wherein the system control unit connected with a valve control unit. A valve-level control layer comprises the valve control unit, wherein the valve control unit issues sub-modular trigger pulse signals to sub-modular controllers. A modular-level control layer comprises the sub-modular controllers, wherein the sub-modular controllers are arranged in sub-modulars of a modular multilevel converter valve in a dispersed mode, and each sub-modular controller is used for having control over connection and disconnection between an upper power modular and a lower power modular of the corresponding sub-modular. Integrated control over a whole modular multilevel converter is achieved at different control priority levels by adopting a layered structure with a plurality of control units according to the requirement of the modular multilevel converter for special control, and the good foundation is laid for large-scale engineering application of the modular multilevel converter.

Description

technical field [0001] The present invention relates to the field of power conversion technology, in particular to a modular multilevel converter (MMC) system widely used in power applications such as flexible direct current transmission and static var generators, and its Control system and control method. Background technique [0002] Siemens proposed VSC HVDC (Voltage Source Converter Based High Voltage Direct Current) technology based on Modular Multilevel Converter (MMC), and named it for HVDC PLUS, as attached figure 1 shown. Due to the modular design and manufacture, MMC can easily reach a high number of levels, which is difficult for traditional multi-level technologies, such as diode-clamped and capacitor-clamped converters. Therefore, the MMC level step is very small, has good output characteristics, and it is easy to build a large-capacity converter. According to the information of Siemens, it can reach 1000MW or even larger. It can be said that MMC is more sui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
Inventor 邓明吴强张志学唐剑钊刘华东谭胜武何伯钧秦灿华梁文超刘永丰
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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