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Three-level converter power unit double pulse test method

A technology of power unit and test method, which is applied in the direction of measuring electrical variables, instruments, measuring electricity, etc., can solve the problems of complicated test methods, burned circuits, and poor pertinence, and achieve the effect of simple and effective test methods

Inactive Publication Date: 2015-10-07
NARI TECH CO LTD
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Problems solved by technology

However, the traditional double-pulse test method for two-level converters is not suitable for three-level converters. Many scholars have also studied the commutation characteristics and absorption circuits of three-level converters, mainly through the system Continuous testing of three-level topological circuits to obtain the working conditions of three-level topological circuits. The test methods are complex and not very specific. It is difficult to find some deep-seated design defects, and there is a risk of burning the circuit if the design is unreasonable.

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  • Three-level converter power unit double pulse test method
  • Three-level converter power unit double pulse test method
  • Three-level converter power unit double pulse test method

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the drawings. The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0020] Such as figure 1 Shown is a circuit diagram of an existing three-level converter power unit. The three-level converter power unit includes an upper-arm DC source DC1, a lower-arm DC source DC2, a first supporting capacitor C1, and a second supporting capacitor C2. , First discharge resistor R1, second discharge resistor R2, clamp resistor R3, first absorption capacitor Cs1, second absorption capacitor Cs2, first discharge contactor S1, second discharge contactor S2, first freewheeling diode D1 , The second freewheeling diode D2, the third freewheeling diode D3, the fourth freewheeling diode D4, the first clamping diode D5, the second clamping diode D6, the first IGBTT1, the second IGBTT2, ...

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Abstract

The invention discloses a three-level converter power unit double pulse test method. On the basis of a conventional two-level topology converter double pulse test idea, upper and lower bridge arms of a three-level converter power unit are decomposed reasonably, and comprehensive tests can be carried out on various conversion working conditions of the three-level converter power unit, device switching time, absorption circuit overvoltage absorption effect and drive short-circuit protection, and thus provided is a simple and effective test method for the development of a three-level converter.

Description

Technical field [0001] The invention relates to a double-pulse test method for a three-level converter power unit, which belongs to the technical field of new energy power generation. Background technique [0002] With the increasing capacity of converters and higher voltage levels, the diode mid-point clamp (NPC) three-level circuit has been widely used in industrial transmission, locomotive traction and other occasions with its superior performance. In the development process of the NPC type three-level converter, it is necessary to test the commutation conditions of the circuit components, the absorption effect of the absorption circuit, and the short-circuit protection performance in order to grasp the working performance of the converter. For traditional two-level topology converters, the double-pulse test can be used to test the switching characteristics, overvoltage absorption, and drive protection performance of the device. The double-pulse test has become a two-level top...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 苗亚王小红朱振飞周敏唐侃
Owner NARI TECH CO LTD
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