CN210898928U - Brake module and three-level converter - Google Patents

Brake module and three-level converter Download PDF

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Publication number
CN210898928U
CN210898928U CN201922016563.0U CN201922016563U CN210898928U CN 210898928 U CN210898928 U CN 210898928U CN 201922016563 U CN201922016563 U CN 201922016563U CN 210898928 U CN210898928 U CN 210898928U
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igbt
unit
busbar
diode
brake
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符松格
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects

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Abstract

The embodiment of the utility model discloses braking module and three-level converter relates to the wind power generation field. The braking module is arranged between the positive pole of the direct current bus and the negative pole of the direct current bus of the three-level converter; the brake module comprises a first brake unit, a first IGBT unit, a second brake unit and a second IGBT unit which are connected in series; the first brake unit comprises a first diode and a first brake resistor subunit which are connected in parallel; the first IGBT unit comprises two or more series-connected IGBT switches; the second brake unit comprises a second diode and a second brake resistor subunit which are connected in parallel; the second IGBT cell includes two or more IGBT switches connected in series. The utility model discloses technical scheme can improve three level converter's security.

Description

Brake module and three-level converter
Technical Field
The utility model belongs to the wind power generation field especially relates to a brake module and three-level converter.
Background
With the development of wind power generation technology, the conversion efficiency of an electrical transmission chain between a generator of a wind generating set and a wind power converter becomes a key point of attention. The three-level converter can improve the voltage grade of the electric transmission chain so as to reduce the loss caused by current in the electric energy transmission process. The three-level converter can also reduce the loss of heating elements.
In the application process of the three-level converter, the voltage of a direct-current bus is raised due to the influences of conditions such as fault ride-through, abnormal shutdown and the like. In this case, the brake module in the three-level converter is put into operation in order to maintain the dc bus voltage stable. However, due to the conditions of fault ride-through, abnormal shutdown and the like, the voltage of the direct current bus is too high, and the blocking voltage of the brake module is not enough to support the too high voltage of the direct current bus, so that the safety of the three-level converter is reduced.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a braking module and three level converter can improve three level converter's security.
In a first aspect, an embodiment of the present invention provides a brake module, where the brake module is configured to be disposed between a dc bus positive electrode and a dc bus negative electrode of a three-level converter;
the brake module comprises a first brake unit, a first IGBT unit, a second brake unit and a second IGBT unit which are connected in series;
the first brake unit comprises a first diode and a first brake resistor subunit which are connected in parallel;
the first IGBT unit comprises two or more series-connected IGBT switches;
the second brake unit comprises a second diode and a second brake resistor subunit which are connected in parallel;
the second IGBT cell includes two or more IGBT switches connected in series.
In some possible embodiments, the braking module comprises a first wiring port for connection to a positive pole of the dc bus of the three-level converter, a second wiring port for connection to a midpoint of the dc bus of the three-level converter, and a third wiring port for connection to a negative pole of the dc bus of the three-level converter;
the anode of the first diode is connected with the first end of the first IGBT unit, and the cathode of the first diode is connected with the first wiring port;
the second end of the first IGBT unit is connected with the second wiring port;
the anode of the second diode is connected with the first end of the second IGBT unit, and the cathode of the second diode is connected with the second wiring port;
and the second end of the second IGBT unit is connected with the third wiring port.
In some possible embodiments, the braking module comprises a first wiring port for connection to a positive pole of the dc bus of the three-level converter, a second wiring port for connection to a midpoint of the dc bus of the three-level converter, and a third wiring port for connection to a negative pole of the dc bus of the three-level converter;
the first end of the first IGBT unit is connected with the first wiring port, and the second end of the first IGBT unit is connected with the cathode of the first diode;
the anode of the first diode is connected with the second wiring port;
the cathode of the second diode is connected with the second wiring port;
the first end of the second IGBT unit is connected with the anode of the second diode, and the second end of the second IGBT unit is connected with the third wiring port.
In some possible embodiments, the braking module is provided with a third IGBT unit, and the diodes in two adjacent IGBT switches in the third IGBT unit are a first diode and a second diode respectively.
In some possible embodiments, the braking module further comprises:
the composite busbar is used for connecting the first IGBT unit, the second IGBT unit and the third IGBT unit.
In some possible embodiments, the composite busbar includes a stacked dc bus positive busbar, a dc bus midpoint busbar, and a dc bus negative busbar;
the first IGBT unit is packaged into a first IGBT packaging block, and the first end of the first IGBT unit is connected with the connecting terminal of the direct-current bus positive busbar through the direct-current positive terminal of the first IGBT packaging block;
the second IGBT unit is packaged into a second IGBT packaging block, and the second end of the second IGBT unit is connected with the connecting terminal of the DC bus negative busbar through the DC negative terminal of the second IGBT packaging block;
the third IGBT unit is packaged into a third IGBT packaging block, the third end of the third IGBT unit is connected with the connecting terminal of the direct-current bus midpoint busbar through the alternating-current terminal of the third IGBT packaging block, and the third end of the third IGBT unit is located between two adjacent series-connected IGBT switches in the third IGBT unit.
In some possible embodiments, the composite busbar comprises a first busbar and a second busbar which are laminated;
the first IGBT unit is packaged into a first IGBT packaging block, and the second end of the first IGBT unit is connected with the first connecting terminal of the first busbar through the direct-current negative terminal of the first IGBT packaging block;
the second IGBT unit is packaged into a second IGBT packaging block, and the first end of the second IGBT unit is connected with the first connecting terminal of the second busbar through the direct-current positive terminal of the second IGBT packaging block;
the third IGBT unit is packaged into a third IGBT packaging block, the first end of the third IGBT unit is connected with the second connecting terminal of the first busbar through the direct-current positive terminal of the third IGBT packaging block, and the second end of the third IGBT unit is connected with the second connecting terminal of the second busbar through the direct-current negative terminal of the third IGBT packaging block.
In some possible embodiments, the third IGBT packaging block is fixed to one side of the composite busbar.
In some possible embodiments, the braking module further comprises:
the first driving circuit board is connected with the control end of each IGBT switch in the first IGBT unit;
and the second driving circuit board is connected with the control end of each IGBT switch in the second IGBT unit.
In a second aspect, an embodiment of the present invention provides a three-level converter, including a connected rectifier, a brake module and an inverter in the technical solution of the first aspect.
The embodiment of the utility model provides a brake module and three level converter, first IGBT unit are including two or more than two IGBT switches of establishing ties. The second IGBT cell includes two or more IGBT switches connected in series. Under the condition that the brake module is put into operation, the blocking voltage of two or more series-connected IGBT switches is higher, the voltage blocking capacity of the first IGBT unit and the second IGBT unit is improved, and the voltage safety margin of the brake circuit is enhanced, so that the overhigh direct-current bus voltage can be supported, and the safety of the three-level converter is improved.
Drawings
The present invention may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which like or similar reference characters identify like or similar features.
Fig. 1 is a schematic structural diagram of a brake module according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a brake module according to another embodiment of the present invention;
fig. 3 is a circuit diagram of a brake module according to another embodiment of the present invention;
fig. 4 is a schematic diagram of an IGBT package block according to an embodiment of the present invention;
fig. 5 is a schematic view of a connection relationship between each IGBT package block and a composite bus bar in a brake module according to an embodiment of the present invention;
fig. 6 is a schematic view of a connection relationship between each IGBT package block and a composite busbar in another brake module provided by the embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The present invention is in no way limited to any specific configuration and algorithm set forth below, but covers any modification, replacement or improvement of elements, components and algorithms without departing from the spirit of the present invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.
The embodiment of the utility model provides a braking module and three level converter can be applied to in the higher scene of voltage of three level converter's direct current bus. The embodiment of the utility model provides an in, braking module sets up between the anodal and the direct current bus negative pole of three level converter's direct current bus. The blocking voltage of the brake module is improved, and the over-high direct current bus voltage can be supported, so that the safety of the three-level converter is improved. For example, the method can be applied to a scene that the direct current bus exceeds 900 volts. In the field of wind power generation, the safety of the three-level converter is improved, and further the safety of the wind generating set is improved.
Fig. 1 is a schematic structural diagram of a brake module according to an embodiment of the present invention. As shown in fig. 1, the brake module includes a first brake cell P1, a first Insulated Gate Bipolar Transistor (IGBT) cell, a second brake cell P3, and a second IGBT cell P4 connected in series. Here, the series order of the first brake unit P1, the first IGBT unit P2, the second brake unit P3, and the second IGBT unit P4 is not limited.
First brake unit P1 includes a first diode and a first brake resistor subunit connected in parallel.
The first braking resistor subunit may include one or more braking resistors, and the number, resistance value, and connection relationship of the braking resistors in the first braking resistor subunit may be set according to a working scenario and a working requirement, which is not limited herein.
First IGBT cell P2 includes two or more IGBT switches connected in series.
The driving signals of the two or more series-connected IGBT switches in the first IGBT cell P2 may be the same, so as to ensure that the two or more series-connected IGBT switches in the first IGBT cell P2 are turned on or off synchronously. In some examples, the same drive circuit board may be used to provide drive signals for all IGBT switches in first IGBT cell P2. For example, a first driving circuit board is provided, which is connected to the control terminal of each IGBT switch in the first IGBT cell P2.
The first IGBT cell P2 takes over the overvoltage stress generated in the dc loop from the dc bus positive electrode of the dc bus to the dc bus midpoint. Two or more series-connected IGBT switches are provided in the first IGBT cell P2, so that the blocking voltage of the first IGBT cell P2 can be raised.
The second brake unit P3 includes a second diode and a second brake resistor subunit connected in parallel.
The second brake resistor subunit may include one or more brake resistors, and the number, resistance value, and connection relationship of the brake resistors in the second brake resistor subunit may be set according to a working scenario and a working requirement, which is not limited herein.
The second IGBT cell P4 includes two or more IGBT switches connected in series.
The driving signals of the two or more series-connected IGBT switches in the second IGBT cell P4 may be the same, so as to ensure that the two or more series-connected IGBT switches in the second IGBT cell P4 are turned on or off synchronously. In some examples, the same drive circuit board may be used to provide drive signals for all IGBT switches in second IGBT cell P4. For example, a second driving circuit board is provided, and the second driving circuit board is connected to the control terminal of each IGBT switch in the second IGBT cell P4.
Second IGBT cell P4 takes over the overvoltage stress generated in the dc circuit from the dc bus midpoint of the dc bus to the dc bus negative electrode. Two or more series-connected IGBT switches are arranged in the second IGBT cell P4, so that the blocking voltage of the second IGBT cell P4 can be raised.
When the first IGBT cell P2 is turned on, the braking current forms a loop through the first braking resistor subunit and the first IGBT cell P2. When first IGBT unit P2 is turned off, the stray inductance of first braking resistor subunit itself forms a freewheeling circuit via the first diode, thereby ensuring that the current does not change abruptly.
When the second IGBT cell P4 is turned on, the braking current forms a loop through the second braking resistor subunit and the second IGBT cell P4. Under the condition that the second IGBT cell P4 is turned off, the stray inductance of the second braking resistor subunit itself forms a freewheeling loop through the second diode, thereby ensuring that the current does not suddenly change.
The stray inductance of the braking resistors in the first and second braking resistor subunits is typically on the order of microhenries (i.e., muh). When the first IGBT cell P2 or the second IGBT cell P4 is turned off, the freewheeling current generated by the braking resistor is quickly consumed by the braking resistor, resulting in a rapid decay of the freewheeling current. The current class of first diode and second diode can select the current class that is far below first IGBT unit P2 and the current class of second IGBT unit P4, consequently, compares with the scheme that adopts the IGBT switch of single high voltage, the utility model provides an embodiment's brake module can reduce certain cost.
In an embodiment of the present invention, the first IGBT cell P2 includes two or more IGBT switches connected in series. The second IGBT cell P4 includes two or more IGBT switches connected in series. Under the condition that the brake module is put into operation, the blocking voltage of two or more series-connected IGBT switches is higher, the voltage blocking capacity of the first IGBT unit P2 and the second IGBT unit P4 is improved, the voltage safety margin of the brake circuit is enhanced, and therefore the overhigh direct-current bus voltage can be supported. Under the condition that the voltage of the direct current bus is abnormally raised and the part, corresponding to the upper half bus or the lower half bus, in the braking module is put into operation, the safety of the three-level converter can be ensured.
Furthermore, the embodiment of the utility model provides an adopt the IGBT switch of low-voltage grade, can realize the improvement of braking module voltage safety margin, improved the uniformity of IGBT switch, reduced braking module's cost.
The following description will be given taking as an example that each of the first IGBT cell P2 and the second IGBT cell P4 includes two IGBT switches connected in series. Fig. 2 is a circuit diagram of a brake module according to another embodiment of the present invention. As shown in fig. 2, the first braking resistor subunit includes a braking resistor R1, and the second braking resistor subunit includes a braking resistor R2. The brake module may further comprise a first connection port for connection to a positive pole of a dc bus of the three-level converter, a second connection port for connection to a midpoint of the dc bus of the three-level converter, and a third connection port for connection to a negative pole of the dc bus of the three-level converter.
An anode of the first diode D1 is connected to a first terminal of the first IGBT cell P2, and a cathode of the first diode D1 is connected to the first connection port.
A second terminal of first IGBT cell P2 is connected to the second connection port.
The first IGBT cell P2 includes two IGBT switches, an IGBT switch T1 and an IGBT switch T2, respectively. Wherein, the first terminal of the IGBT switch T1 may be the first terminal of the first IGBT cell P2, and the second terminal of the IGBT switch T1 is connected to the first terminal of the IGBT switch T2. The second terminal of the IGBT switch T2 is the second terminal of the first IGBT cell P2.
An anode of the second diode D2 is connected to the first terminal of the second IGBT cell P4, and a cathode of the second diode D2 is connected to the second connection port.
A second terminal of second IGBT cell P4 is connected to the third connection port.
The second IGBT cell P4 includes two IGBT switches, an IGBT switch T3 and an IGBT switch T4, respectively. Wherein, the first terminal of the IGBT switch T3 may be the first terminal of the second IGBT cell P4, and the second terminal of the IGBT switch T3 is connected to the first terminal of the IGBT switch T4. The second terminal of the IGBT switch T4 is the second terminal of the second IGBT cell P4.
Fig. 3 is a circuit diagram of a brake module according to another embodiment of the present invention. As shown in fig. 3, the first brake resistor subunit includes a brake resistor R3, and the second brake resistor subunit includes a brake resistor R4. The brake module may further comprise a first connection port for connection to a positive pole of a dc bus of the three-level converter, a second connection port for connection to a midpoint of the dc bus of the three-level converter, and a third connection port for connection to a negative pole of the dc bus of the three-level converter.
A first terminal of the first IGBT cell P2 is connected to the first connection port, and a second terminal of the first IGBT cell P2 is connected to the cathode of the first diode D1.
As shown in fig. 3, the first IGBT cell P2 includes two IGBT switches in series, an IGBT switch T5 and an IGBT switch T6, respectively. The first end of the IGBT switch T5 is the first end of the first IGBT cell P2, and the second end of the IGBT switch T5 is connected to the first end of the IGBT switch T6. The second terminal of the IGBT switch T6 is the second terminal of the first IGBT cell P2.
The anode of the first diode D1 is connected to the second connection port.
The cathode of the second diode D2 is connected to the second connection port.
A first terminal of the second IGBT cell P4 is connected to the anode of the second diode D2, and a second terminal of the second IGBT cell P4 is connected to the third connection port.
As shown in fig. 3, the second IGBT cell P4 includes two IGBT switches in series, an IGBT switch T7 and an IGBT switch T8, respectively. The first end of the IGBT switch T7 is the first end of the second IGBT cell P4, and the second end of the IGBT switch T7 is connected to the first end of the IGBT switch T8. The second terminal of the IGBT switch T8 is the second terminal of the second IGBT cell P4.
As shown in fig. 3, the first diode D1 and the second diode D2 may form an anti-parallel structure. When the first IGBT cell P2 and the second IGBT cell P4 are simultaneously operated, that is, the braking module brakes the dc full bus. At this time, the braking current flows from the first IGBT cell P2 through the braking resistor R3, the braking resistor R4, and the second IGBT cell P4. When the braking module is controlled to operate by a Pulse Width Modulation (PWM) signal, at the time when the first IGBT unit P2 and the second IGBT unit P4 are turned off at the same time, the current of the braking resistor R3 freewheels through the first diode D1, and the current of the braking resistor R4 freewheels through the second diode D2. In this case, the back electromotive force generated by the stray inductance of the first diode D1 and the back electromotive force generated by the stray inductance of the second diode D2 in the anti-parallel structure can be cancelled out, so that the back electromotive force generated by the stray inductance of the first diode D1 or the back electromotive force generated by the stray inductance of the second diode D2 is prevented from being superimposed on the voltage of the dc bus, thereby ensuring that no additional overvoltage is caused, reducing or even eliminating the influence of the first diode D1 and the second diode D2, and further ensuring that the blocking voltage capability of the first IGBT unit P2 and the second IGBT unit P4 is sufficient to support the voltage of the dc bus.
The brake module is convenient to package, and the sizes of all components in the brake module are compatible. The first diode D1 and the second diode D2 in the above embodiments can be implemented by free-wheeling diodes carried by two adjacent IGBT switches in one IGBT cell. Specifically, the brake module may be provided with a third IGBT cell, and the diodes in two adjacent IGBT switches in the third IGBT cell are the above-described first diode D1 and second diode D2, respectively.
The first IGBT cell, the second IGBT cell, and the third IGBT cell in the above-described embodiments may be each packaged. In some examples, the first IGBT cell, the second IGBT cell, and the third IGBT cell may be packaged as an IGBT package block. For example, the first IGBT cell, the second IGBT cell, and the third IGBT cell may be packaged based on EconoDUAL. Fig. 4 is a schematic diagram of an IGBT package block provided by an embodiment of the present invention. As shown in fig. 4, the IGBT package has a DC positive terminal DC1 and a DC negative terminal DC2 on one side and an AC terminal AC1 on the other side.
In some embodiments, the brake module may further include a composite busbar. The composite busbar is used for connecting the first IGBT unit, the second IGBT unit and the third IGBT unit.
In some examples, the composite busbar may be a three-layer composite busbar. The composite busbar comprises a direct current bus positive busbar, a direct current bus midpoint busbar and a direct current bus negative busbar which are stacked. The direct-current bus positive busbar is used for being connected with a direct-current bus positive electrode. The direct current bus midpoint busbar is used for being connected with the direct current bus midpoint. The direct current bus negative electrode busbar is used for being connected with a direct current bus negative electrode.
Fig. 5 is a schematic diagram of a connection relationship between each IGBT package block and a composite busbar in a brake module according to an embodiment of the present invention. The first IGBT unit package is a first IGBT package block, the second IGBT unit package is a second IGBT package block, and the third IGBT unit package is a third IGBT package block.
As shown in fig. 5, the first end of the first IGBT cell is connected to the connection terminal F1 of the DC bus bar positive bus bar through the DC positive terminal DC1 of the first IGBT package block B1. The second end of the second IGBT unit is connected to the connection terminal F3 of the DC bus bar via the DC negative terminal DC2 of the second IGBT package block B2. And the third end of the third IGBT unit is connected with the connecting terminal F2 of the neutral point bus bar of the direct current bus through an alternating current terminal AC1 of a third IGBT packaging block B3. And the third end of the third IGBT unit is positioned between two adjacent series-connected IGBT switches in the third IGBT unit. The circuit structure shown in fig. 3 can be realized by the three-layer composite busbar.
In other examples, the composite bus bar may be a two-layer composite bus bar. The composite busbar comprises a first busbar and a second busbar which are stacked.
Fig. 6 is a schematic view of a connection relationship between each IGBT package block and a composite busbar in another brake module provided by the embodiment of the present invention. The first IGBT unit package is a first IGBT package block, the second IGBT unit package is a second IGBT package block, and the third IGBT unit package is a third IGBT package block.
As shown in fig. 6, the second end of the first IGBT cell is connected to the first connection terminal F11 of the first busbar through the DC negative terminal DC2 of the first IGBT package block B1. The first end of the second IGBT unit is connected to the first connection terminal F21 of the second busbar through the dc positive terminal of the second IGBT package block B2. The first end of the third IGBT cell is connected to the second connection terminal F12 of the first busbar through the DC positive terminal DC1 of the third IGBT package block B3. The second end of the third IGBT unit is connected to the second connection terminal F22 of the second busbar through the DC negative terminal DC2 of the third IGBT package block B3. The circuit structure shown in fig. 3 can be realized by two layers of composite busbars. In fig. 6, the DC positive terminal DC1 of the third IGBT package block B3 coincides with the second connection terminal F12 of the first busbar, and the DC negative terminal DC2 of the third IGBT package block B3 coincides with the second connection terminal F22 of the second busbar.
The third IGBT package block B3 may be fixed to one side of the composite busbar. For example, the composite busbar can be arranged on the upper surface of the third IGBT packaging block B3, the composite busbar can be provided with two round holes, and the third IGBT packaging block B3 is fixedly connected with the composite busbar through the round holes and other fixing pieces.
Under the condition that the first IGBT unit in the first IGBT package block B1 and the second IGBT unit in the second IGBT package block B2 work simultaneously, two currents in opposite directions are formed inside the third IGBT package block B3 due to two anti-parallel diodes in the third IGBT package block B3, and the two currents in opposite directions can be mutually counteracted, so that stray inductance inside the third IGBT package block B3 is reduced or even eliminated. In addition, current paths in opposite directions are formed in the two layers of composite busbars, and stray inductance on the composite busbars for connection is reduced, so that stray inductance on a brake loop where the brake module is located is reduced, the blocking voltage allowance of the IGBT unit is further improved, and the safety and reliability of the brake module and the three-level converter comprising the brake module in working are improved.
The first IGBT package block B1, the second IGBT package block B2, and the third IGBT package block B3 in the above embodiments may employ the same current package specification; the third IGBT package block B3 packaged with a low current may be used, and the package sizes of the first IGBT package block B1, the second IGBT package block B2, and the third IGBT package block B3 may be kept consistent, which is not limited herein.
The embodiment of the utility model provides a still provide a three level converter, this three level converter is including the rectifier of connection, braking module and the dc-to-ac converter in the above-mentioned embodiment. For related contents, reference may be made to the related descriptions in the above embodiments, which are not repeated herein.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For the three-level converter embodiment, reference may be made to the description of the brake module embodiment. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art can make various changes, modifications and additions after comprehending the spirit of the present invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
It will be appreciated by persons skilled in the art that the above embodiments are illustrative and not restrictive. Different features which are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims. In the claims, the term "comprising" does not exclude other means or steps; the indefinite article "a" does not exclude a plurality; the terms "first" and "second" are used to denote a name and not to denote any particular order. Any reference signs in the claims shall not be construed as limiting the scope. The functions of the various parts appearing in the claims may be implemented by a single hardware or software module. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims (10)

1. The braking module is characterized by being arranged between a direct current bus positive electrode and a direct current bus negative electrode of a three-level converter;
the brake module comprises a first brake unit, a first IGBT unit, a second brake unit and a second IGBT unit which are connected in series;
the first brake unit comprises a first diode and a first brake resistor subunit which are connected in parallel;
the first IGBT unit comprises two or more series-connected IGBT switches;
the second brake unit comprises a second diode and a second brake resistor subunit which are connected in parallel;
the second IGBT unit comprises two or more IGBT switches connected in series.
2. A brake module according to claim 1, characterized in that the brake module comprises a first connection port for connection to the positive pole of the dc bus of a three-level converter, a second connection port for connection to the midpoint of the dc bus of a three-level converter, and a third connection port for connection to the negative pole of the dc bus of a three-level converter;
the anode of the first diode is connected with the first end of the first IGBT unit, and the cathode of the first diode is connected with the first wiring port;
the second end of the first IGBT unit is connected with the second wiring port;
the anode of the second diode is connected with the first end of the second IGBT unit, and the cathode of the second diode is connected with the second wiring port;
and the second end of the second IGBT unit is connected with the third wiring port.
3. A brake module according to claim 1, characterized in that the brake module comprises a first connection port for connection to the positive pole of the dc bus of a three-level converter, a second connection port for connection to the midpoint of the dc bus of a three-level converter, and a third connection port for connection to the negative pole of the dc bus of a three-level converter;
the first end of the first IGBT unit is connected with the first wiring port, and the second end of the first IGBT unit is connected with the cathode of the first diode;
an anode of the first diode is connected with the second connection port;
the cathode of the second diode is connected with the second wiring port;
and the first end of the second IGBT unit is connected with the anode of the second diode, and the second end of the second IGBT unit is connected with the third wiring port.
4. A brake module according to claim 3, wherein the brake module is provided with a third IGBT cell, the diodes in two adjacent IGBT switches in the third IGBT cell being the first diode and the second diode, respectively.
5. The brake module of claim 4, further comprising:
the composite busbar is used for connecting the first IGBT unit, the second IGBT unit and the third IGBT unit.
6. The brake module according to claim 5, wherein the composite busbar comprises a direct current busbar positive busbar, a direct current busbar midpoint busbar and a direct current busbar negative busbar which are stacked;
the first IGBT unit is packaged into a first IGBT packaging block, and the first end of the first IGBT unit is connected with the connecting terminal of the direct-current bus positive busbar through the direct-current positive terminal of the first IGBT packaging block;
the second IGBT unit is packaged into a second IGBT packaging block, and the second end of the second IGBT unit is connected with the connecting terminal of the direct-current bus negative busbar through the direct-current negative terminal of the second IGBT packaging block;
the third IGBT unit is packaged into a third IGBT packaging block, the third end of the third IGBT unit is connected with the connecting terminal of the direct-current bus midpoint busbar through the alternating-current terminal of the third IGBT packaging block, and the third end of the third IGBT unit is located between two adjacent series-connected IGBT switches in the third IGBT unit.
7. The brake module of claim 5, wherein the composite busbar comprises a first busbar and a second busbar stacked;
the first IGBT unit is packaged into a first IGBT packaging block, and the second end of the first IGBT unit is connected with the first connecting terminal of the first busbar through the direct-current negative terminal of the first IGBT packaging block;
the second IGBT unit is packaged into a second IGBT packaging block, and the first end of the second IGBT unit is connected with the first connecting terminal of the second busbar through the direct-current positive terminal of the second IGBT packaging block;
the third IGBT unit package is third IGBT encapsulation piece, the first end of third IGBT unit passes through the direct current positive terminal of third IGBT encapsulation piece with the second connecting terminal of first female row is connected, the second end of third IGBT unit passes through the direct current negative terminal of third IGBT encapsulation piece with the second connecting terminal of the female row of second is connected.
8. The brake module of claim 7, wherein the third IGBT packaging block is fixed on one surface of the composite busbar.
9. The brake module of claim 1, further comprising:
the first driving circuit board is connected with the control end of each IGBT switch in the first IGBT unit;
and the second driving circuit board is connected with the control end of each IGBT switch in the second IGBT unit.
10. A three-level converter comprising a rectifier, a brake module according to any one of claims 1 to 9 and an inverter connected.
CN201922016563.0U 2019-11-19 2019-11-19 Brake module and three-level converter Active CN210898928U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022022213A1 (en) * 2020-07-31 2022-02-03 北京金风科创风电设备有限公司 Power assembly of three-level inverter, three-level inverter, and wind turbine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022022213A1 (en) * 2020-07-31 2022-02-03 北京金风科创风电设备有限公司 Power assembly of three-level inverter, three-level inverter, and wind turbine
US11784582B2 (en) 2020-07-31 2023-10-10 Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd. Power component of three-level converter, three-level converter and wind turbine

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