CN206962717U - A kind of compact wind energy converter power model - Google Patents

Abstract

The utility model discloses a compact wind energy converter power module, which comprises a converter power unit and a capacitor unit. Each converter power unit includes a plurality of IGBT subunits, and each IGBT subunit includes two IGBT assemblies. Each IGBT component includes two IGBTs, IGBT bus bars, and AC copper bars. In the same IGBT sub-unit: the AC copper bar 1 introduces electric energy to the two IGBT 1, and after being rectified by the two IGBT 1 into DC, it is directly injected into the multiple DC support capacitors of the corresponding capacitor unit through the IGBT bus 1 , through The IGBT busbar 2 directly connected to this capacitor unit is led to two IGBT 2s, which is converted into AC power through the two IGBT 2nd inverters, and is led out through the AC copper bar 2nd. The utility model can reduce the parasitic inductance in the loop, thereby reducing the peak voltage of the IGBT and improving the reliability of the system.

Description

A compact wind energy converter power module

technical field

The utility model relates to a power module, in particular to a compact wind energy converter power module.

Background technique

In the wind power generation system, the wind energy converter is one of the core equipment and an important bridge connecting the generator and the power grid. Among them, the power module is the core component of the converter, and it is a vulnerable part, and most of the wind energy converters are used in areas with harsh environments such as severe cold, high temperature and high humidity, which requires the power of the wind energy converter The module has the following characteristics: ①High reliability; ②Small size, high power density, easy to replace; ③The power module is a vulnerable part, which should be considered for easy maintenance; ④Low direct hardware cost and maintenance cost.

The structure of the power module of the existing high-power wind energy converter is usually an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, referred to as IGBT), a liquid cooling plate (or radiator) for heat dissipation, and a DC support capacitor. And the bus bar connecting the IGBT and the DC support capacitor, etc. are integrated to form a single-phase power module. Then connect the DC sides of at least 6 such single-phase power modules (multiples of 6) through copper bars or laminated bus bars to form a power module of a wind energy converter.

Alternatively, a three-phase power module is formed by integrating multiple IGBTs, liquid cooling plates (or radiators) for heat dissipation, DC support capacitors, and bus bars connecting IGBTs and DC support capacitors. Then connect the DC sides of at least two (multiples of 2) such three-phase power modules together through copper bars or laminated bus bars to form a power module of a wind energy converter.

The disadvantages of the first existing technical solution: ①The connection of the DC side of the single-phase power module requires a large area of copper bars or laminated bus bars, and the parasitic inductance of the loop is large, resulting in large voltage spikes and reduced reliability; In order to control voltage peaks, more DC support capacitors are needed, which is costly; ②The number of single-phase power modules required to form a power module of a wind energy converter is large, the system integration is not high, the structure is not compact enough, and the power density is low. This leads to high cost; ③The power module of the wind energy converter integrates multiple DC support capacitors into the power module, and the weight of a single single-phase power module is more than 70-80kg, which is inconvenient to maintain.

Determination of the existence of the second existing technical solution: ①The DC side of the three-phase power module needs to be connected by copper bars or laminated bus bars, and the stray inductance of the loop is large. In order to control the voltage peak, more DC support capacitors or other ② The stacked busbar connecting the IGBT to the capacitor has a large area. If the IGBT blows up, the stacked busbar covering it will inevitably be damaged, and even affect other IGBTs under the stacked busbar. The repair cost is high. ③The power module of the wind energy converter is a three-phase output, and the weight of a single three-phase power module is more than 80-90kg, which makes maintenance more inconvenient.

Utility model content

In order to reduce the parasitic inductance in the loop, thereby reducing the peak voltage of the IGBT and improving the reliability of the system, the utility model proposes a compact wind energy converter power module.

The solution of the utility model is: a compact wind energy converter power module, which includes at least one set of converter power units and at least one capacitor unit corresponding to the at least one set of converter power units; A converter power unit includes a plurality of IGBT sub-units, each IGBT sub-unit includes a box, a grid-side IGBT component and a machine-side IGBT component that are housed in the box and arranged one above the other; the grid-side IGBT component includes two IGBTs 1. IGBT bus bar 1, AC copper bar 1, the IGBT components on the machine side include two IGBTs 2, IGBT bus bar 2, and AC copper bar 2;

Among them, in the same IGBT sub-unit: the AC copper bar 1 introduces electric energy to the two IGBT 1, after being rectified by the two IGBT 1 into DC, it is directly injected into the multiple DC support capacitors of the corresponding capacitor unit through the IGBT bus 1 , lead to two IGBTs through the IGBT busbar 2 directly connected to this capacitor unit, and convert it into AC power through the two IGBTs 2, and lead it out through the AC copper bar 2.

As a further improvement of the above scheme, the capacitor unit also includes a capacitor busbar and a mounting board in addition to multiple DC supporting capacitors; multiple DC supporting capacitors are installed on the mounting board, and the capacitor busbar covers multiple DC supporting capacitors and leads out Multiple pairs of positive contact terminals and negative contact terminals corresponding to all IGBT subunits; IGBT busbar one is electrically connected to IGBT busbar two through positive contact terminals and negative contact terminals corresponding to corresponding IGBT subunits.

Further, the plurality of DC support capacitors are divided into corresponding groups according to the number of IGBT subunits in the corresponding converter power unit, and the DC support capacitors in each group are divided into corresponding groups according to the number of corresponding IGBT components, and the DC in each group The supporting capacitors are connected in parallel and the corresponding positive and negative contact terminals are drawn out on the capacitor busbar.

As a further improvement of the above scheme, multiple IGBT subunits in the same converter power unit are arranged in parallel, and the parallel arrangement direction is perpendicular to the vertical stacking direction of the corresponding two IGBT components.

As a further improvement of the above solution, multiple DC support capacitors in the same capacitor unit are parallel to each other.

As a further improvement of the above solution, when the number of converter power units is multiple, the multiple converter power units are arranged in parallel, and the parallel arrangement direction is perpendicular to the vertical stacking direction of the corresponding two IGBT components; the multiple capacitor units Along the parallel arrangement direction of multiple converter power units, they are also arranged in parallel.

Further, two adjacent capacitor units are connected in series through copper bars and fuses.

Still further, each IGBT component also includes a driving board for driving and controlling the corresponding IGBT, and a liquid cooling plate for cooling the corresponding IGBT component.

As a further improvement of the above scheme, the box body includes a bottom plate, a U-shaped coaming plate, side cover plate 1, side cover plate 2 and a front panel; after the side cover plate 1 and side cover plate 2 are spliced together, they are respectively fixed on the base plate and the front panel The three open sides of the U-shaped enclosure and the U-shaped enclosure form the main frame of the box.

Further, the box body further includes a middle partition, and the middle partition is located in the box body to divide the box body into two storage cavities, and each storage cavity accommodates one IGBT component.

The beneficial effects of the utility model are as follows:

1. The structure is compact and the path of the whole system is short, which is conducive to reducing the parasitic inductance in the loop, thereby reducing the peak voltage of the IGBT and improving the reliability of the system. Due to the reduction of the total parasitic inductance in the loop, it can also be appropriately simplified DC support capacitors and other devices to reduce costs;

2. In view of the fragile characteristics of IGBT, this technical solution adopts two measures to reduce the area of IGBT busbar and separate IGBT busbar and capacitor busbar to reduce the scope of faults;

3. Combining with the characteristics of the damaged drive board, a convenient detachable side cover is designed, and the drive board can be replaced when the power unit of the converter is removed;

4. The power unit of the converter is separated from the capacitor unit, which reduces the weight of the power unit of the converter and facilitates installation and maintenance.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a compact wind energy converter power module provided by Embodiment 1 of the present utility model.

Fig. 2 is a schematic diagram of energy flow of one of the IGBT modules of the compact wind energy converter power module in Fig. 1. In order to clearly show the direction of energy flow, side cover 1 and side cover 2 are removed.

Fig. 3 is a three-dimensional exploded view of one of the IGBT modules of the power module of the compact wind energy converter in Fig. 1 .

FIG. 4 is an exploded perspective view of the housing of the IGBT module in FIG. 3 .

Fig. 5 is a schematic perspective view of a capacitor unit of the power module of the compact wind energy converter in Fig. 1 .

Fig. 6 is a three-dimensional schematic diagram of the compact wind energy converter power module provided by Embodiment 2 of the utility model, which adopts two sets of compact wind energy converter power modules in Fig. 1 connected in parallel.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Example 1

Please refer to Fig. 1 and Fig. 2 together, the compact wind energy converter power module of the present embodiment comprises a group of converter power units (also referred to as IGBT power units) and a capacitor unit 2, the quantity of the capacitor unit 2 Corresponding to the number of groups of converter power units, in other embodiments, the number of groups of converter power units may be even more, as in Embodiment 2 below.

Each converter power unit includes a plurality of IGBT subunits 1, such as three. Please refer to FIG. 3 , each IGBT unit 1 includes a box body 17 , and two IGBT components installed in the box body 17 and stacked one above the other. The two IGBT components are respectively defined as: the grid-side IGBT component and the machine-side IGBT component.

The grid-side IGBT components include two IGBT-4, IGBT busbar-5, AC copper bar-15, driver board-6, and liquid cooling board-7. The machine-side IGBT components include two IGBTs 11, IGBT bus bars 13, AC copper bars 16, drive boards 12, and liquid cooling boards 14. The driver board drives and controls the corresponding IGBT, and the liquid cooling board dissipates heat for the corresponding IGBT components.

Each IGBT subunit 1 and the corresponding capacitor unit 2 are directly connected together. The three IGBT sub-units 1 are parallel to each other, and when arranged, the three IGBT sub-units 1 are arranged in parallel, and the parallel arrangement direction is perpendicular to the vertical stacking direction of the corresponding two IGBT components.

In the same IGBT subunit 1: the AC copper bar 15 introduces electric energy to two IGBTs 4, and after being rectified by the two IGBTs 4 into DC, it is directly injected into the corresponding capacitor unit 2 through the IGBT bus 15 The DC support capacitor 22 is led to the two IGBTs 11 through the IGBT busbar 2 13 directly connected to the capacitor unit 2 , is converted into AC power through the two IGBTs 11 , and is drawn out through the AC copper bar 2 16 . In the entire circuit, the IGBT unit and the capacitor unit 2 are directly connected together, the DC side path is very short, and the total stray inductance is small, thereby reducing the voltage spike of the IGBT and improving the reliability of the system. The input of electric energy can also be input from AC copper bar 2 16 and output from AC copper bar 1 15, that is, the direction of electric energy flow is reversible, and can be selected according to actual structural needs.

Two IGBT-4 and two IGBT-11 share one busbar, so that both integration and maintainability can be considered. If a certain IGBT explodes, the busbar on it will inevitably be damaged, and may also cause damage to other IGBTs connected to the modified busbar. Due to the small design of the IGBT busbar, it is not only easy to replace, but also effectively reduces failures. The affected range greatly reduces the cost of repairing faulty machines.

Please refer to FIG. 4 , the capacitor unit 2 includes a capacitor busbar 21 , a mounting board 23 , and a plurality of DC support capacitors 22 . Multiple DC support capacitors 22 are installed on the mounting board 23 , and the capacitor busbar 21 covers the multiple DC support capacitors 22 and leads out multiple pairs of positive contact terminals 24 and negative contact terminals 25 corresponding to all IGBT subunits. The first IGBT busbar 5 is electrically connected to the second IGBT busbar 13 through the positive contact terminal 24 and the negative contact terminal 25 corresponding to the corresponding IGBT subunit. The plurality of DC support capacitors 22 in the same capacitor unit 2 are parallel to each other as far as possible, and no DC support capacitor 22 is included in any IGBT component, so that the weight of the IGBT sub-unit 1 is reduced.

A plurality of DC support capacitors 22 are divided into corresponding groups according to the number of IGBT subunits 1 in the corresponding converter power unit, and the DC support capacitors 22 in each group are divided into corresponding groups according to the number of corresponding IGBT components. The DC in each group The supporting capacitors 22 are connected in parallel and lead out corresponding positive contact terminals 24 and negative contact terminals 25 on the capacitor busbar 21 .

Please refer to FIG. 5 , the box body 17 includes a bottom plate 171 , a U-shaped enclosure 172 , a middle partition 173 , a side cover 1 174 , a side cover 2 175 and a front panel 176 . The bottom plate 171 is installed on one side of the U-shaped enclosure 172 , so that the bottom plate 171 serves as the bottom wall of the box body 17 . The first side cover 174 and the second side cover 175 are installed on the opposite side of the U-shaped enclosure 172 , so that the first side cover 174 and the second side cover 175 serve as the top wall of the box body 17 . The front panel 176 closes the U-shaped opening of the U-shaped enclosure 172 , so that the front panel 176 and the U-shaped enclosure 172 serve as side walls of the box body 17 . The middle partition 173 divides the box body 17 into two installation spaces for installing IGBT components respectively. Therefore, after the side cover plate 1 174 and the side cover plate 2 175 are spliced together, they are respectively fixed on the three opening sides of the U-shaped coaming plate 172 with the bottom plate 171 and the front panel 176, and form the main body of the box body 17 with the U-shaped coaming plate 172 framework.

The material of the U-shaped enclosure 172 can be non-magnetic materials such as stainless steel plate or aluminum alloy plate, so as to prevent the generation of eddy current heating when the AC copper bar 16 passes through the modified U-shaped enclosure 172 . The side cover plate 1 174 can be removed without pulling out the IGBT subunit 1 . The specific steps are: remove the front panel 176, and then remove the upper and lower two fixing screws of the side cover 174, and then the side cover 174 can be pulled out forward. In this way, the driving board 12 can be replaced without disassembling the IGBT sub-unit 1 , which is convenient for maintenance. The middle partition 172 is located between the two groups of IGBT components to prevent the explosion of one group of IGBT components from impacting the other group of IGBT components.

Please refer to FIG. 5 , the capacitor unit 2 includes a capacitor bus bar 21 , a plurality of DC support capacitors 22 and a mounting board 23 . These DC support capacitors 22 are installed on the mounting board 23 , and the capacitor busbar 21 covers the DC support capacitors 22 and is electrically connected to the terminals of these DC support capacitors 22 . These DC support capacitors 22 are divided into three groups according to the number of IGBT subunits 1, and the DC support capacitors 22 of each large group are divided into two groups according to the two IGBT components of the corresponding IGBT subunit 1, and the DC support capacitors 22 of each group are connected in parallel. And lead out positive terminal and negative terminal.

Example 2

Please refer to Figure 6, the difference between embodiment 2 and embodiment 1 is that the number of converter power units in embodiment 2 is more, in order to meet the needs of different power levels, the power of the compact wind energy converter provided by the utility model The module can arrange multiple groups of converter power units side by side, and interconnect the DC side of the capacitor unit 2 with copper bars 3, so as to realize rapid capacity expansion.

In this embodiment, the number of converter power units is two, and the two converter power units are arranged in parallel, and the parallel arrangement direction is perpendicular to the vertical stacking direction of the corresponding two IGBT components; the multiple capacitor units 2 are also Along the parallel arrangement direction of multiple converter power units, they are also arranged in parallel. Two adjacent capacitor units 2 are connected in series through a copper bar 3 and a fuse 8, and a fuse 8 is added between the copper bars 3 to prevent the failure of a certain group of converter power units from affecting the power of other converters. unit, effectively reducing the system risk.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. A compact wind energy converter power module, characterized in that: it comprises at least one group of converter power units, at least one capacitor unit (2) corresponding to the at least one group of converter power units; Each converter power unit includes a plurality of IGBT subunits (1), and each IGBT subunit (1) includes a box body (17), grid-side IGBT components housed in the box body (17) and stacked up and down and machine-side IGBT components; grid-side IGBT components include two IGBT 1 (4), IGBT bus bar 1 (5), AC copper bar 1 (15), machine-side IGBT components include two IGBT 2 (11), IGBT bus row two (13), AC copper row two (16); Among them, in the same IGBT subunit (1): AC copper bar one (15) introduces electric energy to two IGBTs one (4), and after being rectified by two IGBTs one (4) into direct current, it passes through IGBT bus bar one ( 5) Direct injection into multiple DC support capacitors (22) of the corresponding capacitor unit (2), lead to two IGBT busbars (13) directly connected to the capacitor unit (2) to two IGBTs (11), The two IGBTs (11) are converted into alternating current, and are drawn out through the second AC copper bar (16). 2. The compact wind energy converter power module as claimed in claim 1, characterized in that: the capacitor unit (2) also includes a capacitor busbar (21), a mounting plate ( 23); multiple DC support capacitors (22) are installed on the mounting board (23), and the capacitor busbar (21) covers multiple DC support capacitors (22) and leads out multiple pairs of positive poles corresponding to all IGBT subunits Contact terminal (24) and negative contact terminal (25); IGBT busbar 1 (5) is electrically connected to IGBT busbar 2 through the positive contact terminal (24) and negative contact terminal (25) corresponding to the corresponding IGBT subunit (13). 3. The compact wind energy converter power module as claimed in claim 2, characterized in that: a plurality of DC support capacitors (22) are divided into corresponding group, the DC support capacitors (22) in each group are divided into corresponding groups according to the number of corresponding IGBT components, and the DC support capacitors (22) in each group are connected in parallel and the corresponding positive contact terminals ( 24) and the negative contact terminal (25). 4. The compact wind energy converter power module according to claim 1, characterized in that: multiple IGBT subunits (1) in the same converter power unit are arranged in parallel, and the parallel arrangement direction is perpendicular to the corresponding two The vertical stacking direction of each IGBT component. 5. The compact wind energy converter power module according to claim 1, characterized in that: multiple DC support capacitors (22) in the same capacitor unit (2) are parallel to each other. 6. The compact wind energy converter power module according to claim 1, characterized in that: when there are multiple converter power units, the multiple converter power units are arranged in parallel, and the parallel arrangement direction is perpendicular to Corresponding to the vertical stacking direction of the two IGBT assemblies; the multiple capacitor units (2) are also arranged in parallel along the parallel arrangement direction of the multiple converter power units. 7. The compact wind energy converter power module according to claim 6, characterized in that two adjacent capacitor units (2) are connected in series through copper bars (3) and fuses (8). 8 . The compact wind energy converter power module according to claim 7 , wherein each IGBT assembly further includes a driving board for driving and controlling the corresponding IGBT, and a liquid cooling plate for cooling the corresponding IGBT assembly. 9. The compact wind energy converter power module according to claim 1, characterized in that: the box body (17) includes a bottom plate (171), a U-shaped enclosure (172), a side cover (174), a side Cover plate two (175) and front panel (176); After side cover plate one (174) and side cover plate two (175) are spliced, be fixed on U-shaped coaming plate (176) with base plate (171), front panel (176) respectively Three opening sides of 172) surround the main frame of casing (17) with U-shaped coaming plate (172). 10. The compact wind energy converter power module according to claim 9, characterized in that: the box body (17) also includes a middle partition (173), and the middle partition (173) is located in the box body (17) to The box body (17) is divided into two storage cavities to accommodate the grid-side IGBT components and the machine-side IGBT components respectively.