Service life evaluating method and device for sub-module capacitor of modular multi-level converter
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A modular multi-level, life evaluation technology, applied in the field of power transmission, can solve the problem of inability to accurately analyze the life of MMC capacitors
Active Publication Date: 2018-08-17
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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[0005] Embodiments of the present invention provide a method and device for evaluating the life of a sub-module capacitor of a modula
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Embodiment 1
[0063] Embodiment 1. An embodiment of the present invention provides a method for evaluating the life of a sub-module capacitor of a modular multilevel converter, such as figure 1 Shown include:
[0064] S101. Initialize the initial damage degree D of the capacitor in the sub-module of the MCC to be detected 0 and capacitor life L ife .
[0065] It should be noted that in practical applications, for the convenience of calculation, the initial value of the damage degree D is usually 0 set to 0, the lifetime L ife Set to 0; initial damage D 0 The larger the capacitor, the more life it consumes, that is, the life L ife and initial damage D 0 It is directly proportional; among them, when D q When =1, it means that the damage degree of the capacitor is 100%, that is, the capacitor is damaged.
[0066] S102. Obtain the operating parameters of the MCC, the task profile parameters, the sampling time interval Δt, and the rated capacitance C of the capacitor d , The first aging...
Embodiment 2
[0143] Embodiment 2. The embodiment of the present invention provides a sub-module capacitor life evaluation device 10 of a modular multilevel converter, such as Figure 14 Shown include:
[0144] Initialization module 101, for initializing the initial damage degree D of the capacitor in the sub-module of the MCC to be detected 0 and capacitor life L ife .
[0145] The data acquisition module 102 is used to acquire the operating parameters of the MCC, the task profile parameters, the sampling time interval Δt, and the rated capacitance value C of the capacitor d , The first aging correction factor k of the capacitor C and a second aging correction factor k for the equivalent resistance ESR of the capacitor ESR ; Among them, the operating parameters include: the rated voltage U of the MMC DC side dc and rated current I dc , Rated phase voltage amplitude U of MMC AC side m and rated phase current amplitude I m And the reactance value L of the reactor on the bridge arm of...
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Abstract
The embodiment of the invention provides a service life evaluating method and device for a sub-module capacitor of a modular multi-level converter, and relates to the technical field of power transmission. The problem that the service life of the capacitor in the MMC cannot be accurately analyzed in the prior art is solved. The method comprises the steps that the initial damage degree and servicelife of the capacitor in a sub-module of the MCC are initialized; the operating parameter of the MCC, a task profile parameter, sampling time interval delta t, the rated capacitance value Cd of the capacitor, the first aging correction factor kC of the capacitor, and the second aging correction factor kESR of an equivalent resistor ESR of the capacitor are acquired; the steps from S1 to S4 are circulated; if Dq is greater than or equal to 1, circulation is stopped; and the service life evaluation result of the capacitor is generated according to the service life Life of the capacitor, the sampling time interval delta t and the number of times q of circulation. The method and device are used for calculating the damage degree of the capacitor in the MMC.
Description
technical field [0001] The invention relates to the technical field of power transmission, in particular to a method and device for evaluating the life of a sub-module capacitor of a modular multilevel converter. Background technique [0002] With the development of power electronics technology, modular multilevel converters, with the advantages of low loss, scalable modular structure, and high-quality power quality, are used in high-voltage flexible DC (English full name: Flexible-High-VoltageDirect Current, referred to as: Flexible-HVDC) power transmission, photovoltaic, wind power, distributed power generation and other fields have received extensive attention. [0003] The sub-module of the modular multilevel converter is composed of two insulated gate bipolar transistor (English full name: InsulatedGate Bipolar Transistor, abbreviated: IGBT) modules and a capacitor. As one of the core components of the MMC sub-module, the capacitor has a large number and undertakes the...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 陈雁洪潮许家友汪隆君
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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