Method for Lifetime Evaluation of Modular Multilevel Converter
A modular multi-level and life evaluation technology, which is applied in the conversion of AC power input to DC power output, electrical components, design optimization/simulation, etc., which can solve the problems of slow simulation speed and inconvenient analysis.
Active Publication Date: 2020-10-02
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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This method uses mathematical analytical expressions to obtain the average value and effective value of the MMC submodule (Submodule, SM) current. The physical meaning is clear and the calculation speed is fast, which overcomes the shortcomings of slow simulation speed and inconvenient analysis.
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[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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The invention discloses a method for assessing the life of a modular multilevel converter, comprising the following steps: reading the annual temperature data of the natural environment in which the MMC operates and the power data injected into the MMC; analyzing and calculating the IGBT and Diode currents of the MMC sub-modules The average value and effective value; calculate the average power loss P in the fundamental frequency period of the MMC sub-module IGBT and Diode loss,T and P loss,D ;Use the Foster network model to calculate the average temperature rise T of the semiconductor device in the operating frequency cycle ja , to obtain the value T of the average junction temperature of the IGBT module (IGBTmodules, IGBTs, including IGBT and Diode) j ; According to the IGBTs average junction temperature correction and fitting calculation IGBTs loss; calculate the maximum value of the operating frequency cycle junction temperature, and count the annual fundamental frequency junction temperature cycle; statistics the annual low-frequency junction temperature fluctuation information; use the Bayerer life model to calculate semiconductor devices Number of failure cycles N of fundamental frequency and low frequency f , combined with the operating conditions to obtain the MMC life. The invention can reliably predict the life of the MMC, can effectively improve the calculation speed of prediction by obtaining the analytical expressions of the current and the junction temperature, and has the characteristics of engineering practicality 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 environments. 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...
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IPC IPC(8): G06F30/20H02M7/483H02M7/537G06F119/04
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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