CN107370395B

CN107370395B - Traction power module composite busbar compatible with rectification and inversion functions

Info

Publication number: CN107370395B
Application number: CN201710695575.3A
Authority: CN
Inventors: 杨璐; 王雷; 李守蓉; 赵爱萍; 赵一洁
Original assignee: CRRC Yongji Electric Co Ltd
Current assignee: CRRC Yongji Electric Co Ltd
Priority date: 2017-08-15
Filing date: 2017-08-15
Publication date: 2020-08-21
Anticipated expiration: 2037-08-15
Also published as: CN107370395A

Abstract

The invention relates to a power module busbar in an electric locomotive or a high-speed motor train unit, in particular to a traction power module composite busbar compatible with rectification and inversion functions, which comprises a left busbar and a right busbar, wherein each busbar is divided into two layers, the bottom layer is a direct-current layer copper bar, the top part is an alternating-current layer copper bar, the direct-current layer copper bars of the left busbar and the right busbar are respectively provided with three direct-current terminals of S1+, S2-and S1+, the direct-current terminals are output at the front side of the busbar, the alternating-current layer copper bar of the left busbar is provided with two terminals of SA1 and SA2, the alternating-current layer copper bar of the right busbar is provided with two terminals of SB1 and SB2, the direct-current terminals of SA1, SA2, SB1 and SB2 are output at the rear side of the; for rectification, the terminals SA1 and SA2 are externally connected to form a terminal SA, the terminals SB1 and SB2 are externally connected to form terminals SB, and SA and SB are single-phase inputs for rectification. The invention reduces the research and development quantity of power modules and shortens the design period; the types and the number of the spare parts of each locomotive depot and the motor car are reduced, and the cost is reduced.

Description

Traction power module composite busbar compatible with rectification and inversion functions

Technical Field

The invention relates to a power module busbar in an electric locomotive or a high-speed motor train unit, in particular to a traction power module composite busbar compatible with rectification and inversion functions.

Background

In a high-power alternating-current transmission electric locomotive or a high-speed motor train unit, a traction four-quadrant power module and a traction inversion chopping power module are main components forming a main circuit of a converter system, and the traction four-quadrant power module and the traction inversion chopping power module are combined together to complete function transformation of the whole converter system and provide required voltage and current for a traction motor. If the two power modules are all formed into one module, the corresponding power module composite busbar is also all formed into one type. The number of spare parts obtained by each locomotive depot and the motor train is greatly reduced, the economic cost of each locomotive depot and the motor train is reduced, and the design cost and the component cost of the power module are also reduced.

Disclosure of Invention

The invention provides a traction power module composite bus compatible with rectification and inversion functions, which is suitable for a power module project of a high-power alternating-current transmission traction converter system, wherein a traction four-quadrant power module and a traction inversion chopping power module composite bus are formed into the traction power module composite bus, so that high-voltage electrical connection of the four-quadrant rectification function and high-voltage electrical connection of the inversion chopping function can be realized, only one type of composite bus is required to be completed during design, and the design period of a scheme is shortened; the composite busbar supply period is also shortened, the design cost and the material cost of the power module are reduced, and the economic cost is further reduced for each locomotive section and the bullet train.

The invention is realized by adopting the following technical scheme: the traction power module composite busbar compatible with rectification and inversion functions comprises a left busbar and a right busbar, each busbar is divided into two layers, the bottom layer is a direct-current layer copper bar, the top part is an alternating-current layer copper bar, the direct-current layer copper bars of the left busbar and the right busbar are respectively provided with three direct-current terminals of S1+, S2-and S1+, the direct-current terminals are output at the front side of the busbar, the alternating-current layer copper bar of the left busbar is provided with two terminals of SA1 and SA2, the alternating-current layer copper bar of the right busbar is provided with two terminals of SB1 and SB2, the direct-current terminals of SA1, SA2, SB1 and SB2 are directly output at the rear side of the busbar when the composite busbar is subjected to the inversion chopping; for rectification, the terminals SA1 and SA2 are externally connected to form a terminal SA, the terminals SB1 and SB2 are externally connected to form terminals SB, and SA and SB are single-phase inputs for rectification.

As shown in fig. 1, when the current traction quadrant power module works, the current class of the IGBT is limited, 8 IGBTs are connected in parallel in pairs to complete the rectification function, and the number of the composite busbar ac output terminals is 2. The synchronism of the main circuit when the parallel IGBT is connected with the composite busbar needs to be considered. Compared with the prior art, the traction inverter chopping power module is generally a three-phase inverter circuit and a chopper circuit, the single tube can complete power conversion, the number of the composite busbar at the alternating current output terminal is 4, circuit synchronism does not need to be considered, and temperature rise and inductance value only need to be considered. Through the contrast, because the requirement that the composite busbar of the power module is connected as the high-voltage electrical connection of the four-quadrant rectification is higher, the design scheme is more rigorous, so when the composite busbar scheme of the traction module is designed, the electrical connection function of completing the four quadrants is more considered, and the inversion chopping function is also considered.

As shown in fig. 1, the traction four-quadrant power module is a single-phase ac input and shares an intermediate dc loop with the traction inverter chopper power module. The four-quadrant power module has 4 bridge arms in total, every two bridge arms are connected in parallel, the IGBT of the upper bridge arm and the IGBT of the lower bridge arm are connected in parallel in pairs respectively, the IGBT of the upper bridge arm and the IGBT of the lower bridge arm are finally used as single-phase alternating current input, and 2 alternating current input terminals are arranged. The inversion chopping power module is also provided with 4 bridge arms, wherein 3 bridge arms are used as three-phase inversion alternating current output, 1 bridge arm is used as chopper circuit output, and the number of alternating current output terminals is 4. Through analysis, the traction four-quadrant power module and the traction inversion chopping power module have commonality, namely 4 bridge arms are arranged, a middle direct current loop is shared, and the traction four-quadrant power module and the traction inversion chopping power module have the possibility of being unified. The traction power module is of a traditional type, the number of the composite busbar alternating current terminals of the traction power module is 4, namely SA1, SA2, SB1 and SB2, when the traction power module is used for rectification, two alternating current terminals of which the main circuits are in a parallel connection mode are short-circuited in a converter cabinet body outside the power module, as shown in fig. 2.

The technical scheme of the invention has the following beneficial effects:

1) the research and development quantity of power modules is reduced, and the design period is shortened;

2) the types and the number of the spare parts of each locomotive depot and the motor car are reduced, and the cost is reduced.

Drawings

Fig. 1 is a schematic diagram of a main circuit of a power module of a traction converter system.

Fig. 2 is a schematic diagram of a main circuit of a power module in a composite busbar system type scheme.

Fig. 3 is a schematic structural diagram of the left busbar.

Fig. 4 is a schematic structural diagram of the right busbar.

Detailed Description

The traction power module composite busbar compatible with rectification and inversion functions comprises a left busbar and a right busbar, each busbar is divided into two layers, the bottom layer is a direct-current layer copper bar, the top part is an alternating-current layer copper bar, the direct-current layer copper bars of the left busbar and the right busbar are respectively provided with three direct-current terminals of S1+, S2-and S1+, the direct-current terminals are output at the front side of the busbar, the alternating-current layer copper bar of the left busbar is provided with two terminals of SA1 and SA2, the alternating-current layer copper bar of the right busbar is provided with two terminals of SB1 and SB2, the direct-current terminals of SA1, SA2, SB1 and SB2 are directly output at the rear side of the busbar when the composite busbar is subjected to the inversion chopping; for rectification, the terminals SA1 and SA2 are externally connected to form a terminal SA, the terminals SB1 and SB2 are externally connected to form terminals SB, and SA and SB are single-phase inputs for rectification.

The thickness of the copper bar selected by the composite busbar meets the requirements of current and temperature rise, the insulating film and the insulating layer meet the voltage-resistant requirement, the surface of the output end is subjected to tinning treatment, and the design of the busbar meets the requirements of creepage distance and electric clearance of a product.

Considering the current sharing characteristic of the composite busbar in parallel connection, the left busbar and the right busbar are completely in mirror symmetry, the internal current paths of the single busbar are completely the same or have small difference, resistance and inductance simulation is carried out on two branch copper bars serving as current sharing, and the difference is not more than 5% allowed by design.

Claims

1. The traction power module composite busbar compatible with rectification and inversion functions is characterized by comprising a left busbar and a right busbar, each busbar is divided into two layers, the bottom layer is a direct-current layer copper bar, the top part is an alternating-current layer copper bar, the direct-current layer copper bars of the left busbar and the right busbar are respectively provided with three direct-current terminals of S1+, S2-and S1+, the direct-current terminals are output at the front side of the busbar, the alternating-current layer copper bar of the left busbar is provided with two terminals of SA1 and SA2, the alternating-current layer copper bar of the right busbar is provided with two terminals of SB1 and SB2, the direct-current terminals of SA1, SA2, SB1 and SB2 are directly output at the rear side of the busbar, and when the composite busbar is used for the; for rectification, the terminals SA1 and SA2 are externally connected to form a terminal SA, the terminals SB1 and SB2 are externally connected to form terminals SB, and SA and SB are single-phase inputs for rectification.