MMC Dynamic Redundancy Preventive Maintenance Method Considering the Effect of Operating Conditions

A preventive maintenance, dynamic redundancy technology, applied in instrumentation, safety arrangements, control/regulation systems, etc., to solve problems such as not meeting the basic conditions of the constant failure rate model

Active Publication Date: 2020-08-18
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the failure rate of power devices changes with time and does not meet the basic conditions of the constant failure rate model, it is necessary to further study the influence of MMC operating conditions on preventive maintenance based on the failure mechanism of power devices

Method used

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  • MMC Dynamic Redundancy Preventive Maintenance Method Considering the Effect of Operating Conditions
  • MMC Dynamic Redundancy Preventive Maintenance Method Considering the Effect of Operating Conditions
  • MMC Dynamic Redundancy Preventive Maintenance Method Considering the Effect of Operating Conditions

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Embodiment 1

[0133] see Figure 1 to Figure 2 , the MMC dynamic redundancy preventive maintenance method considering the impact of operating conditions mainly includes the following steps:

[0134] 1) Determine the wind power transmission system to be maintained, and obtain the population sample data of MMC redundant sub-modules.

[0135] 2) Read the meteorological data of the wind power transmission system to generate a sample set of meteorological data for the entire life cycle.

[0136] The meteorological data of the wind power transmission system mainly include wind speed and air temperature of the wind power transmission system.

[0137] The method of generating the meteorological data sample set of the whole life cycle is to use the Monte Carlo method to randomly sample the data of the wind power transmission system.

[0138] 3) Establish the reliability evaluation model of MMC power devices in the wind power transmission system, and calculate the reliability of MMC power devices. ...

Embodiment 2

[0258] see Figure 3 to Figure 9 , an experiment to verify the MMC dynamic redundancy preventive maintenance method considering the influence of operating conditions, mainly includes the following steps:

[0259] 1) Build a hybrid MMC power module.

[0260] In this embodiment, the FF1000R17IE4 power module of Infineon Company is used as the hybrid MMC power module, as shown in Table 1, and the wind speed and temperature data of Dublin, Ireland in 2016 and Qinghai in 2017 are used as the external working conditions of the wind farm and MMC, based on the present invention The proposed model is used to evaluate the maintenance cost of MMC. MMC and fan parameters are shown in Table 2.

[0261] Table 1 Thermal parameter table of FF1000R17IE4 power module

[0262]

[0263] Table 2 Hybrid MMC and fan parameters

[0264] parameter value System rated capacity 124MW Grid side voltage 72kV DC side voltage 160kV HBSM benchmark number 100 ...

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Abstract

The invention discloses an MMC dynamic redundancy preventive maintenance method considering the influence of operation conditions. The method mainly comprises the following steps: 1) obtaining sampledata of an MMC redundancy submodule population; 2) generating a meteorological data sample set of the whole life cycle; 3) establishing a reliability evaluation model for an MMC power device in a windpower transmission system, and calculating to obtain the reliability of the MMC power device; 4) establishing a hybrid MMC capacitor reliability evaluation model, and calculating to obtain the reliability of a capacitor; 5) establishing an MMC whole-life-cycle reliability evaluation model, and calculating the reliability of an MMC within the whole life cycle; and 6) carrying out dynamic preventive maintenance on the MMC. According to the method, on the premise that the reliability of the MMC is guaranteed, the operation and maintenance cost of the MMC is reduced, and the method can be widelyapplied to MMC preventive maintenance work in renewable energy transmission grid connection of wind power and the like.

Description

technical field [0001] The invention relates to the field of wind power transmission, in particular to an MMC dynamic redundant preventive maintenance method considering the influence of operating conditions. Background technique [0002] Modular multilevel converter-type high-voltage direct current transmission (MMC-HVDC) is a promising power transmission method to realize the connection between large-scale wind power transmission system stations and the grid. Among them, the modular multilevel converter (MMC) has the characteristics of modular design and high output voltage quality. It is a key device in VSC-HVDC, and its operational reliability is related to the safe and stable operation of VSC-HVDC. Reasonable preventive maintenance is an important measure to ensure the economical and reliable operation of MMC. At present, most of the studies are based on the constant failure rate of components to construct the MMC preventive maintenance model. On this basis, the influe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B9/03
Inventor 余娟冯斐杨知方代伟赵兴攀
Owner CHONGQING UNIV
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