A Method for Extracting Spurious Parameters of DC Busbar of Power Electronic Converter
A technology of DC busbar and extraction method, which is applied in the measurement of electrical variables, instruments, and measurement of electricity, etc., can solve the problems of dependence, high measurement cost, and complicated implementation, so as to reduce the measurement cost, simplify the experimental measurement process, and ensure accurate results. degree of effect
Active Publication Date: 2019-12-10
TSINGHUA UNIV +1
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Problems solved by technology
The common shortcomings of these two experimental methods are: 1. It is necessary to measure the collector current of the IGBT device, and the converter structure may need to be modified. 2. The accuracy of the extracted results depends on the high-bandwidth current measurement equipment.
Compared with high-bandwidth voltage probes, high-bandwidth current probes are very expensive, and the measurement cost is high. 3. In order to ensure the accuracy of the results, the voltage and current probes are required to have high synchronization, which is complicated to implement
Method used
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Embodiment 1
[0050] The method of the present invention is applied to extract the stray inductance parameter of a direct current busbar of an actual single-phase two-level converter. 4500V / 3000A IGBT devices are used in this converter. Under the conditions of DC bus voltage about 2500V and load current about 2800A, the double pulse experiment was carried out. image 3 It is the waveform diagram of the IGBT turn-on transient experiment of the embodiment of the present invention. In order to compare with the traditional method, while measuring the load current, a high-bandwidth current probe is also used to measure the IGBT collector current i c Measurements were taken. Apply the method of the present invention to extract the DC busbar stray inductance of the converter, and select the integration termination time t e is the voltage v across the freewheeling diode d When rising from 0, the stray inductance value of the DC busbar is 478nH; select the integration start time and integration ...
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The invention discloses a power electronic converter direct-current busbar stray parameter extraction method. The method does not rely on a high-bandwidth current measuring device; a double-pulse circuit is adopted to test a voltage vce at two ends of the collector and emitter of an IGBT, a voltage vd at two ends of a freewheeling diode and load current iL on an load inductor; an integral method is used to calculate the stray inductance of the direct-current busbar of a converter device; and the voltage and current characteristics of the IGBT device and the diode in a transient process are utilized to accurately obtain an integral computation interval. With the method of the invention adopted, the stray parameter extraction result of the direct-current busbar is still highly accurate under a condition that a high-bandwidth current probe is not used.
Description
technical field [0001] The invention relates to the technical field of electronic power converters, in particular to a method for extracting stray parameters of DC busbars of power electronic converters. Background technique [0002] The demand for high-voltage and large-capacity power electronic converters in industrial applications is increasingly extensive, and high-power converters and devices are in a stage of rapid development. In large-capacity converters, the stray inductance of the DC busbar is very large, which interacts with the high current change rate when the IGBT device is turned off, causing a voltage spike on the IGBT device, causing overvoltage loss and increased loss of the device , EMI and a series of issues. Therefore, designing a busbar with low stray inductance becomes a problem that needs to be paid attention to in the structure design of the converter. In order to optimize the DC busbar structure, it is first necessary to accurately extract the str...
Claims
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 蒋烨袁立强冯高辉赵争鸣张海涛易荣丁雅丽顾威鲁挺
Owner TSINGHUA UNIV