Back-to-back testing circuit based on DC/DC converter

A test circuit and converter technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve problems such as engineering application gaps, achieve bidirectional power transmission, reduce test equipment costs and test operation costs, reduce capacity and The effect of making difficulty

Active Publication Date: 2016-06-08
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The DC / DC converter directly determines the safety and economy of the DC power grid. Therefore, it is necessary to provide a technical solution for testing the performance of the DC / DC converter to break through the current research on high-voltage and large-capacity DC / DC converters. , most research institutions are in the stage of theoretical analysis and simulation verification, and some of them are developing small-capacity experimental prototypes, and there is still a big gap from engineering applications.

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  • Back-to-back testing circuit based on DC/DC converter

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Embodiment Construction

[0016] Attached below figure 1 The test method of the present invention is described in further detail.

[0017] This application is mainly directed to the test method of high-voltage large-capacity DC / DC converters. figure 1 Shown is the circuit schematic diagram of the test method. The circuit is mainly composed of two parts: the power supply part and the test part. The power supply part consists of grounding E, AC voltage source AC, circuit breaker QF, transformer TM, three-phase rectifier bridge U, smoothing reactance L, two series capacitors C, and isolation switch QS. Among them, the primary side of the transformer is connected with the AC power supply through the circuit breaker, and the secondary side is connected with the three-phase rectifier bridge. The three-phase rectifier bridge rectifies the AC power transmitted by the AC power supply and outputs the DC current, and charges the capacitor C through the smoothing reactance to form a For a DC voltage with a small...

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Abstract

The invention provides a back-to-back testing circuit based on a DC/DC converter. The back-to-back testing circuit comprises DC buses, a power supply module and a DC/DC converter module. The DC buses are used for connecting the power supply module and the DC/DC converter module in series. According to the back-to-back testing circuit, a back-to-back connection manner is utilized on a tested member; Supplying of one end DC voltage to the tested member is required. Furthermore voltage grade can be selected according to a relatively low rated DC voltage of the tested member. More importantly, two converters can feed most absorbed electric energy back to a power grid, and the power supply part of the testing circuit only supplies a relatively low output current, thereby greatly reducing capacity and manufacture difficulty of testing equipment, and greatly reducing testing equipment cost and operation cost in testing.

Description

technical field [0001] The invention relates to a power electronic system, in particular to a back-to-back test circuit based on a DC / DC converter. Background technique [0002] The demand for the access of distributed renewable energy, the power supply of marine islands, and the centralized transmission of offshore wind farm clusters proposed by the construction of a new urban power grid makes the traditional AC power grid face more and more challenges. The HVDC transmission network based on HVDC transmission technology provides a flexible, economical and efficient technical means to solve the above problems, and has also become one of the research hotspots in the field of power grid technology in the world. [0003] In the AC power grid, the AC transformer realizes the conversion between different voltage levels, and in the DC power grid, the DC / DC converter realizes the interconnection and voltage conversion of different levels of DC voltage. Its main functions include r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 高冲杨俊王新颖王秀环冯健
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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