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Multi-time scale heat damage-based improved hybrid MMC operation reliability assessment model and method

A multi-time scale, evaluation model technology, applied in the direction of instrumentation, design optimization/simulation, calculation, etc., can solve problems that do not meet the basic conditions of the constant failure rate model

Active Publication Date: 2018-09-07
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 MMC operation reliability evaluation model based on the failure mechanism of power devices

Method used

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  • Multi-time scale heat damage-based improved hybrid MMC operation reliability assessment model and method
  • Multi-time scale heat damage-based improved hybrid MMC operation reliability assessment model and method
  • Multi-time scale heat damage-based improved hybrid MMC operation reliability assessment model and method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0170] An improved hybrid MMC operation reliability assessment model based on multi-time scale thermal damage mainly includes the following steps:

[0171] 1) Obtain real-time data of wind power transmission system. The real-time data mainly includes wind speed, air temperature and electrical parameters of equipment.

[0172] 2) Based on the original data, a reliability evaluation model for hybrid MMC power devices is established by using the hybrid MMC operating characteristics and Miner's damage theory. The power device of the wind power transmission system mainly includes an insulated gate bipolar crystal IGBT and a crystal diode Diode.

[0173] Further, the hybrid MMC topology mainly includes three phase units a, b, and c.

[0174] Phase a units are connected in series N CS CSSM modules and N HB HBSM module.

[0175] Phase b units are connected in series N CS CSSM modules and N HB HBSM module.

[0176] The c-phase units are connected in series N CS CSSM modules an...

Embodiment 2

[0330] A method using an improved hybrid MMC operational reliability assessment model based on multi-time scale thermal damage, mainly comprising the following steps:

[0331] 1) Input data in the improved hybrid MMC operation reliability assessment model. The data mainly include environmental parameters and electric parameters of hybrid MMC and fan.

[0332] The environmental parameters mainly include wind speed and temperature Hybrid MMC and fan electrical parameters mainly include switching frequency f sw , Minimum cut-in wind speed, maximum cut-off wind speed, rated wind speed, etc. Hybrid MMC has DC side rated voltage, AC side rated voltage, power factor, modulation ratio and duty cycle, etc.

[0333] 2) According to the input data, the improved hybrid MMC operational reliability evaluation model calculates the power device loss.

[0334] That is, to calculate the sampling time t n In the corresponding time interval T, the average loss P of the IGBT switching cycle...

Embodiment 3

[0344] A test to verify the improved hybrid MMC operation reliability assessment model based on multi-time scale thermal damage mainly includes the following steps:

[0345] 1) Configure the experimental parameters. 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 are used as the external working conditions of the wind farm and the hybrid MMC, based on the model proposed in the present invention To evaluate the operational reliability of the hybrid MMC. The annual data curves of wind speed and temperature are as follows: figure 2 , 3 As shown, the mixed MMC and fan parameters are shown in Table 2.

[0346]

[0347] Table 1 Thermal parameters of FF1000R17IE4 power module

[0348] parameter

value

System rated capacity

400MW

Grid side voltage

220kV

DC side voltage

400kV

HBS...

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Abstract

The invention discloses a multi-time scale heat damage-based improved hybrid MMC operation reliability assessment model and method. The method mainly comprises the following steps of: 1) obtaining real-time data of a wind power transmission system, wherein the real-time data mainly comprises a wind speed, an air temperature and equipment electric parameters; 2) establishing a hybrid MMC power device reliability assessment model by utilizing hybrid MMC operation characteristics and a Miner's damage theory according to original data, wherein power devices of the wind power transmission system mainly comprise an insulated gate bipolar transistor IGBT and a crystal diode; 3) establishing a faulted SM voltage sharing-considered capacitor reliability assessment model according to influences, onintact SM capacitors, of faulted SM; and 4) analyzing hybrid MMC device loss distribution so as to establish an SM multi-state-considered improved hybrid MMC operation reliability assessment model. The model and method can be widely applied to operation reliability assessment of hybrid MMC in transmission grid connection of renewable energy sources such as wind power and the like.

Description

technical field [0001] The invention relates to the field of wind power transmission, in particular to an improved hybrid MMC operation reliability evaluation model and method based on multi-time scale thermal damage. Background technique [0002] Modular multilevel converter-type high-voltage direct current transmission (MMC-HVDC) is a promising power transmission method for connecting large-scale wind farms to 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. However, the random fluctuation of wind speed makes the transmission power of MMC vary greatly, and the fluctuation of power and air temperature further leads to obvious changes in the amplitude and fluctuation of junction temperature of power devices in MMC, which greatly affects the reliability of MMC. At the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20Y02E60/00
Inventor 余娟冯斐萨拉赫·卡莫
Owner CHONGQING UNIV
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