Unlock instant, AI-driven research and patent intelligence for your innovation.

Improved hybrid mmc operation reliability evaluation model and method

A technology for evaluating models and reliability, applied in design optimization/simulation, special data processing applications, etc., can solve problems that do not meet the basic conditions of the constant failure rate model, so as to improve the level of operational reliability, improve operational reliability, and optimize The effect of topology

Active Publication Date: 2021-10-26
CHONGQING UNIV
View PDF5 Cites 0 Cited by
  • 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

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Improved hybrid mmc operation reliability evaluation model and method
  • Improved hybrid mmc operation reliability evaluation model and method
  • Improved hybrid mmc operation reliability evaluation model and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0169] An improved hybrid MMC operation reliability assessment model based on multi-time scale thermal damage mainly includes the following steps:

[0170] 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.

[0171] 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.

[0172] Further, the hybrid MMC topology mainly includes three phase units a, b, and c.

[0173] Phase a units are connected in series N CS CSSM modules and N HB HBSM module.

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

[0175] The c-phase units are connected in series N CS CSSM modules an...

Embodiment 2

[0328] A method using an improved hybrid MMC operational reliability assessment model based on multi-time scale thermal damage, mainly comprising the following steps:

[0329] 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.

[0330] 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.

[0331] 2) According to the input data, the improved hybrid MMC operational reliability evaluation model calculates the power device loss.

[0332] 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

[0342] A test to verify the improved hybrid MMC operation reliability assessment model based on multi-time scale thermal damage mainly includes the following steps:

[0343] 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.

[0344]

[0345] Table 1 Thermal parameters of FF1000R17IE4 power module

[0346] parameter value System rated capacity 400MW Grid side voltage 220kV DC side voltage 400kV HBSM benchmark num...

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

No PUM Login to View More

Abstract

The invention discloses an improved hybrid MMC operation reliability evaluation model and method based on multi-time scale thermal damage, which mainly includes the following steps: 1) Acquiring real-time data of a wind power transmission system. The real-time data mainly includes wind speed, air temperature and electrical parameters of equipment. 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. 3) According to the influence of faulty SM on the capacitance of intact SM, a capacitor reliability evaluation model considering the voltage sharing of faulty SM is established. 4) Analyze the loss distribution of hybrid MMC devices, so as to establish an improved hybrid MMC operation reliability evaluation model considering the multi-state of SM. The invention can be widely used in the operation reliability evaluation of the hybrid MMC in wind power and other renewable energy transmission and grid connection.

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

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
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20Y02E60/00
Inventor 余娟冯斐萨拉赫·卡莫
Owner CHONGQING UNIV