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Life evaluation method for modular multilevel converter

A modular multi-level, life evaluation technology, applied in the conversion of AC power input to DC power output, instruments, electrical components, etc., can solve the problems of slow simulation speed and inconvenient analysis

Active Publication Date: 2017-11-10
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

This method obtains the average value and effective value of the MMC submodule (Submodule, SM) current with mathematical analytical expressions, has clear physical meaning and fast operation speed, and overcomes the shortcomings of slow simulation speed and inconvenient analysis

Method used

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  • Life evaluation method for modular multilevel converter
  • Life evaluation method for modular multilevel converter
  • Life evaluation method for modular multilevel converter

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Embodiment

[0154] In this embodiment, the process of predicting the lifetime module of the MMC submodule is as follows: figure 1 As shown, the topology of the MMC converter is as figure 2 As shown, the submodule topology is as image 3 shown. The DC voltage of MMC is ±160kV, the maximum transmission active power is 500MW, and the power factor of the AC side is 0.9. It is connected to the 220kV AC power grid through a connecting transformer, and the rated modulation degree is 0.75-0.95. The rated voltage of the sub-module is 1.7kV, and the number of bridge arm sub-modules in series is 220, of which the redundancy is 10%. The switching frequency is 300Hz, the model of the IGBT module is FF1000R17IE4, the bridge arm reactance Ls=60mH, the capacity of the connected transformer is 530MVA, the primary / secondary rated voltage of the connected transformer is 220kV / 167kV, the short-circuit impedance of the connected transformer is 15%, and the connected transformer tap is ±8×1.25%. The ther...

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Abstract

The invention discloses a life evaluation method for a modular multilevel converter (MMC). The life evaluation method comprises the following steps: reading year-round temperature data of a running natural environment of the MMC and power data input into the MMC; performing analytic calculation on the average value and the effective value of the current of sub-modules IGBT and Diode of the MMC; calculating the average loss power Ploss,T and Ploss,D of the sub-modules IGBT and Diode of the MMC within the fundamental frequency period; calculating the average temperature rise Tja of a semiconductor device within the working frequency period by use of a Forster network model to obtain the average junction temperature value Tj of IGBT modules (IGBT modules, IGBTs, including IGBT and Diode); modifying fitting calculation of loss of the IGBTs according to the average junction temperature of the IGBTs; calculating the extreme values of the function temperature within the working frequency and counting the year-round fundamental frequency junction temperature cycle; counting fluctuation information of the year-round low-frequency junction temperature; and calculating the failure number Nf of the fundamental frequency and the low frequency of the semi-conductor device by use of a Bayerer life model, and obtaining the life of the MMC in combination with operation conditions. The life evaluation method can reliably forecast the life of the MMC, can effectively improve the forecasting calculation speed through obtaining an analytical expression of both current and the junction temperature, and has the characteristics of project operational capability and the like.

Description

technical field [0001] The invention relates to a method for evaluating the life of a modular multilevel converter, in particular to the life evaluation of intermittent fluctuations in the input power of flexible DC transmission and the impact of natural environment. Background technique [0002] In order to actively respond to climate change, ensure sustained and rapid social and economic development, and promote energy structure optimization and efficient utilization, large-scale development of renewable energy is the development trend of the power industry. Renewable energy is intermittent and random, and its output power has similar characteristics, which restricts the large-scale development of renewable energy. At present, there are mainly three types of grid-connected renewable energy methods: AC transmission, traditional DC transmission and Flexible-HVDC transmission. Taking wind power as an example, large-scale wind farms are connected to the grid through flexible ...

Claims

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Application Information

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IPC IPC(8): G06F17/50H02M7/483H02M7/537
CPCG06F30/20G06F2119/04H02M7/483H02M7/537H02M7/4835
Inventor 洪潮陈雁张野王钢许家友汪隆君钟庆
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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