Fault-tolerant control method and device for asymmetric operation of mmc-hvdc bridge arm
A technology of MMC-HVDC and operation failure, applied in the direction of output power conversion device, power transmission AC network, electrical components, etc., can solve the problems of current asymmetry, asymmetry, DC current fundamental frequency fluctuation, etc., and achieve the elimination of bridge arm Effect of current asymmetry and DC current fluctuation, improving stability and safety
Active Publication Date: 2022-05-20
XUJI GRP +1
View PDF10 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The asymmetry of the bridge arm will lead to the asymmetry of the MMC-HVDC bridge arm current and the asymmetry of the circulating current, which will lead to the fundamental frequency fluctuation of the DC current
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0054] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.
[0055] figure 1 It is a flow chart of the fault-tolerant control method for the asymmetric operation of the MMC-HVDC bridge arm provided by the embodiment of the present invention.
[0056] figure 2 It is a logic diagram of a fault-tolerant control method for asymmetric operation of an MMC-HVDC bridge arm provided by an embodiment of the present invention.
[0057] Please refer to figure 1 with figure 2 The first a...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a fault-tolerant control method and device for asymmetrical operation of MMC-HVDC bridge arms, wherein the method includes the following steps: calculating the initial input quantity of each bridge arm converter valve sub-module according to the modulation wave of the DC pole control module; obtaining The operating status information uploaded by the converter valve sub-module; according to the operating status information uploaded by the converter valve sub-module, the number of faults of the converter valve sub-module is obtained; according to the number of faults of the converter valve sub-module and the current direction of the bridge arm, the The initial input quantity of the converter valve sub-modules of each bridge arm is corrected to eliminate the bridge arm current asymmetry and DC current fluctuation caused by the failure of several converter valve sub-modules. By detecting the state information of the converter valve sub-modules in each bridge arm in real time and obtaining the number of converter valve sub-modules in the fault state, combined with the current direction of the bridge arm, the number of input converter valve sub-modules is corrected to eliminate several Bridge arm current asymmetry and DC current fluctuations caused by converter valve sub-module failure.
Description
technical field [0001] The invention relates to the field of flexible power transmission control of power systems, in particular to a fault-tolerant control method and device for asymmetrical operation of an MMC-HVDC bridge arm. Background technique [0002] With the development of fully-controlled power electronic devices and the application of power electronics technology in power systems, the Voltage-Sourced Converter High Voltage Direct Current (VSC-HVDC) technology based on voltage source converters has attracted increasing attention. Modular Multilevel Converter (MMC, Modular Multilevel Converter) is a kind of voltage source converter in the application of flexible direct current transmission system. It is widely used in flexible direct current transmission and new energy access systems due to its remarkable advantages. [0003] Each bridge arm of MMC-HVDC is composed of a certain number of sub-modules and bridge arm reactors in series. By controlling the number of inp...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02M7/483H02J3/36
CPCY02E60/60
Inventor 胡四全司志磊范彩云韩坤张志刚夏克鹏刘路路张磊
Owner XUJI GRP