CN113872233A

CN113872233A - Integrated power module, converter and wind power plant power transmission system

Info

Publication number: CN113872233A
Application number: CN202010617291.4A
Authority: CN
Inventors: 刘世军; 杨有涛; 耿杰; 李战龙; 王国梁
Original assignee: Xinjiang Goldwind Science and Technology Co Ltd
Current assignee: Xinjiang Goldwind Science and Technology Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-12-31

Abstract

The invention discloses an integrated power module, a converter and a wind power plant power transmission system, wherein the integrated power module comprises: the N cascaded power units are arranged on the insulating bottom plate in a cascaded sequence and are positioned between the first conductive side plate and the second conductive side plate, wherein the first conductive side plate and the second conductive side plate are arranged on two sides of the insulating bottom plate, and N is an integer greater than or equal to 4; and the first reactor component is arranged between the first conductive side plate and the first-stage power unit, a first electrical interface of the first reactor component is connected to the first conductive side plate, and a second electrical interface of the first reactor component is connected to the first-stage power unit. According to the embodiment of the invention, the installation position and the insulation installation part of the first reactor component do not need to be designed independently, so that the problems of high installation difficulty and installation cost of the reactor and large occupied area required by the installation of the reactor are solved.

Description

Integrated power module, converter and wind power plant power transmission system

Technical Field

The invention belongs to the field of power transmission, and particularly relates to an integrated power module, a converter and a wind power plant power transmission system.

Background

In a wind power plant transmission system, a converter is an indispensable energy conversion unit and has the function of converting electric energy with unstable voltage frequency and amplitude into electric energy with stable frequency and amplitude and meeting the requirements of a power grid and then merging the electric energy into the power grid. The core power component of the converter comprises power module strings and reactors connected with the power module strings so as to realize functions of inversion, rectification, braking and the like. Wherein one power module string includes a plurality of power modules in cascade.

However, since the reactor is a high-voltage power device, it is necessary to separately design not only the installation position of the reactor but also the insulating mounting member of the reactor for safety reasons. This results in a high difficulty and a high cost in installing the reactor. In addition, because the voltage class of the reactor connected with one power module in series is higher, a larger distance needs to be kept between the reactor and other devices, that is, other devices cannot be placed in a larger range around the reactor, and therefore the occupied area of the reactor during installation is larger.

Disclosure of Invention

The embodiment of the invention provides an integrated power module, a converter and a wind power plant power transmission system, which can solve the problems of high installation difficulty, high installation cost and large occupied area during installation of a reactor.

In one aspect, an embodiment of the present invention provides an integrated power module, including:

the cascaded N power units are arranged on the insulating bottom plate according to a cascaded sequence and are positioned between the first conductive side plate and the second conductive side plate, wherein the first conductive side plate and the second conductive side plate are arranged on two sides of the insulating bottom plate, and N is an integer greater than or equal to 4;

a first reactor component disposed between the first electrically conductive side plate and the first stage of the power cell, a first electrical interface of the first reactor component being connected to the first electrically conductive side plate, a second electrical interface of the first reactor component being connected to the first stage of the power cell.

In another aspect, an embodiment of the present invention provides a converter, including:

n power module cluster, one of integrating integrates the power module cluster and integrates the power module including cascaded M, every it is above-mentioned first aspect to integrate the power module integration power module, M is more than or equal to 2's integer.

In another aspect, an embodiment of the present invention provides a wind farm power transmission system, including: a current transformer as described in the second aspect above.

According to the integrated power module, the converter and the wind power plant power transmission system, the first reactor component and the cascaded N power units are integrated together to obtain the integrated power module. From this, the installation integrates power module, has just realized the installation of N power unit and first reactor subassembly, does not need the mounted position and the installed part of independent design first reactor subassembly, has solved the big and high problem of installation cost of the installation degree of difficulty of reactor. In addition, the embodiment of the invention integrates the first reactor component in the integrated power module. If a plurality of integrated power modules are cascaded to form an integrated power module string, compared with the prior art in which one reactor is connected to one power module string, the embodiment of the invention divides one reactor connected to one power module string into a plurality of parts and integrates the parts into each power module in the power module string, so that the voltage level of the first reactor assembly can be prevented from being too high, and a relatively large distance needs to be kept between the first reactor assembly and other devices. Therefore, the electric gap of the first reactor component is small, other devices cannot be placed in a large range around the first reactor component, and the first reactor component is prevented from occupying a large area.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a dc power transmission system with a flexible dc converter valve in the related art;

fig. 2 is a schematic structural diagram of a full-bridge power module in the related art;

fig. 3 is a schematic structural diagram of a half-bridge power module in the related art;

fig. 4 is a schematic structural diagram of a star-connected SVG system in the related art;

fig. 5 is a schematic structural diagram of a corner joint SVG system in the related art;

FIG. 6 is a schematic diagram of an integrated power module according to an embodiment of the present invention;

FIG. 7 is a schematic circuit diagram of an integrated power module according to an embodiment of the present invention;

FIG. 8 is a schematic circuit diagram of an integrated power module according to another embodiment of the present invention;

FIG. 9 is a schematic diagram of an integrated power module according to another embodiment of the present invention;

fig. 10 is a circuit configuration diagram of an integrated power module according to another embodiment of the invention;

FIG. 11 is a schematic structural diagram of an integrated power module according to yet another embodiment of the present invention;

fig. 12 is a circuit configuration diagram of an integrated power module according to another embodiment of the invention;

FIG. 13 is a schematic circuit diagram of an integrated power module according to yet another embodiment of the present invention;

FIG. 14 is a schematic diagram of the operation of the switch bypass during a fault of the integrated power module according to one embodiment of the present invention;

FIG. 15 is a schematic diagram of the operating principle of the thyristor redundancy bypass in case of failure of the integrated power module according to one embodiment of the present invention;

FIG. 16 is a schematic diagram of the operation of an integrated power module with thyristor redundancy bypass in the event of a fault according to another embodiment of the invention;

FIG. 17 is a schematic structural view of an insulation box according to an embodiment of the present invention;

FIG. 18 is a schematic diagram of the operation of signal transmission of an integrated power module according to an embodiment of the present invention;

fig. 19 is a schematic diagram of a full bridge power cell including an energy dump unit according to an embodiment of the present invention;

fig. 20 is a schematic diagram of the current flow direction of a full bridge power cell according to an embodiment of the present invention;

fig. 21 is a schematic diagram of the current flow direction of a full bridge power cell according to another embodiment of the present invention;

fig. 22 is a schematic diagram of the current flow direction of a full bridge power cell according to another embodiment of the present invention;

fig. 23 is a schematic diagram of the current flow direction of a full bridge power cell according to yet another embodiment of the present invention;

fig. 24 is a schematic diagram of the current flow direction of a full bridge power cell in a bypass state according to an embodiment of the invention;

fig. 25 is a schematic diagram of the current flow direction of a full bridge power cell in a bypass state according to another embodiment of the present invention;

fig. 26 is a schematic diagram of the current flow direction of a full bridge power cell in a blocking state according to an embodiment of the present invention;

fig. 27 is a schematic diagram of the current flow direction of a full bridge power cell in a blocking state according to another embodiment of the present invention;

fig. 28 is a schematic diagram of the current flow direction of a full bridge power cell in a power dump state according to an embodiment of the invention;

FIG. 29 is a schematic diagram of a positive current through an integrated power module according to an embodiment of the invention;

FIG. 30 is a schematic diagram of a negative current through an integrated power module, according to an embodiment of the present invention;

fig. 31 is a schematic diagram of a half-bridge power cell including a power dump unit according to an embodiment of the invention;

FIG. 32 is a schematic diagram of an integrated power module according to yet another embodiment of the present invention;

FIG. 33 is a schematic diagram of a single power cell in accordance with one embodiment of the present invention;

fig. 34 is a schematic configuration diagram of a first reactor according to an embodiment of the invention;

FIG. 35 is a schematic diagram of a frame structure of an integrated power module according to one embodiment of the invention;

FIG. 36 is a schematic diagram of an integrated power module according to an embodiment of the invention;

figure 37 is a schematic diagram of a flexible dc converter valve dc power transmission system according to an embodiment of the invention;

FIG. 38 is a schematic structural diagram of a star-connected SVG system according to an embodiment of the present invention;

fig. 39 is a schematic structural diagram of a corner joint SVG system according to an embodiment of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent 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 present invention by illustrating examples of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

In order to solve the problems in the prior art, the embodiment of the invention provides an integrated power module, a converter and a wind power plant power transmission system. The integrated power module provided by the embodiment of the invention is first described below.

In a wind power plant transmission system, a converter is an indispensable energy conversion unit and has the function of converting electric energy with unstable voltage frequency and amplitude into electric energy with stable frequency and amplitude and meeting the requirements of a power grid and then merging the electric energy into the power grid. The core power component of the converter comprises a plurality of cascaded power modules and a reactor connected with each power module so as to realize functions of inversion, rectification, braking and the like.

The wind farm power transmission system is described below by taking a flexible direct current converter valve direct current power transmission system as an example.

Fig. 1 is a schematic structural diagram of a dc transmission system of a flexible direct current converter valve in the related art. As shown in fig. 1, the dc transmission system of the flexible dc converter valve includes: a Direct Current wind farm 102, a High-Voltage Direct Current (HVDC) line 104, a system concentrated braking device 106, a Modular Multi-level Converter (MMC) Converter valve 108, and a grid 110.

Wherein, the offshore direct current wind farm 102 transmits the direct current to the MMC converter valve 108 through the HVDC line 104, and the MMC converter valve 108 converts the direct current into alternating current and inputs the alternating current to the power grid 110.

The MMC converter valve 108 is a three-phase six-leg cascade high-voltage device, and the MMC converter valve 108 includes: the bridge comprises an A-phase upper bridge arm, an A-phase lower bridge arm, a B-phase upper bridge arm, a B-phase lower bridge arm, a C-phase upper bridge arm and a C-phase lower bridge arm. The bridge arm of each phase comprises a power module string and a reactor, wherein one power module string comprises a plurality of cascaded power modules.

When a fault occurs on the grid side, the ac bus voltage is reduced, so that the active power of the MMC converter valve 108 is blocked, and the dc wind farm 102 continues to transmit active power to the MMC converter valve 108, so that the voltage of the dc side system is increased, and a fault on the dc side is caused, at this time, an Insulated Gate Bipolar Transistor (IGBT) in the braking device 106 is turned on, so that a resistor in the braking device 106 is put into a two-circuit line of a dc positive electrode and a dc negative electrode, and energy which cannot be transmitted in a short time is consumed. After the voltage of the direct-current bus is quickly recovered to a normal level, the IGBT in the braking device 106 is turned off, and the braking device 106 is quitted from running; when the voltage of the direct-current side system rises again, the braking device 106 is put into operation again, and the operation is repeated until the direct-current system voltage is always kept in a normal horizontal range when the fault of the power grid side is cleared, so that fault ride-through is realized.

The power module in the MMC converter valve 108 may be a full-bridge power module as shown in fig. 2, in which case the MMC converter valve 108 is a full-bridge MMC converter valve. Alternatively, the power module in the MMC converter valve 108 may be a half-bridge power module as shown in fig. 3, in which case the MMC converter valve 108 is a half-bridge MMC converter valve.

The structure of the flexible direct current converter valve direct current power transmission system is described above, and a Static Var Generator (SVG) system is taken as an example to describe a wind farm power transmission system.

The SVG system is illustrated below by two exemplary embodiments.

Fig. 4 is a schematic structural diagram of a star-connected SVG system in the related art. As shown in fig. 4, the star-connected SVG system includes: an A-phase bridge arm reactor 202, a B-phase bridge arm reactor 204, a C-phase bridge arm reactor 206, an A-phase power module string 208, a B-phase power module string 210 and a C-phase power module string 212. One power module string includes a plurality of power modules in cascade.

A first electrical port of the phase-A bridge arm reactor 202 is connected with a 35KV power grid A; a first electric port of the B-phase bridge arm reactor 204 is connected with a 35KV power grid B; a first electrical port of C-phase bridge arm reactor 206 is connected to 35KV grid C.

A second electrical port of the a-phase bridge arm reactor 202 is connected with a first electrical port of the a-phase power module string 208; a second electrical port of the B-phase bridge arm reactor 204 is connected with a first electrical port of the B-phase power module string 210; the second electrical port of C-phase leg reactor 206 is connected to the first electrical port of C-phase power module string 212.

The second electrical port of the a-phase power module string 208, the second electrical port of the B-phase power module string 210, and the second electrical port of the C-phase power module string 212 are connected to form a star configuration.

The power module in the star-connected SVG system may be a full-bridge power module as shown in fig. 2.

Fig. 5 is a schematic structural diagram of a corner joint SVG system in the related art. As shown in fig. 5, the corner joint SVG system includes: phase a first leg reactor 302, phase B first leg reactor 304, phase C first leg reactor 306, phase a power module string 308, phase B power module string 310, phase C power module string 312, phase a second leg reactor 302 ', phase B second leg reactor 304 ', and phase C second leg reactor 306 '.

A first electric port of the phase-A first bridge arm reactor 302 is connected with a 35KV power grid A; a first electric port of the B-phase first bridge arm reactor 304 is connected with a 35KV power grid B; the first electrical port of the C-phase first leg reactor 306 is connected to the 35KV grid C.

A second electrical port of a-phase first leg reactor 302 is connected with a first electrical port of a-phase power module string 308; a second electrical port of phase B first leg reactor 304 is connected to a first electrical port of phase B power module string 310; the second electrical port of C-phase first leg reactor 306 is connected to the first electrical port of C-phase power module string 312.

A second electrical port of phase a power module string 308 is connected to a first electrical port of phase a second leg reactor 302'; a second electrical port of phase B power module string 310 is connected with a first electrical port of phase B second leg reactor 304'; the second electrical port of the C-phase power module string 312 is connected with the first electrical port of the C-phase second leg reactor 306'.

A second electrical port of a phase a second leg reactor 302' is connected to a first electrical port of a phase B first leg reactor 304; the second electrical port of the phase B second leg reactor 304' is connected to the first electrical port of the phase C first leg reactor 306; the second electrical port of phase C second leg reactor 306' is connected to the first electrical port of phase a first leg reactor 302.

The power module in the corner-connected SVG system may be a full-bridge power module as shown in fig. 2.

The SVG system is provided in the ac input power system and between two booster stations, and is used for performing reactive power compensation. Whether to employ a star-connected SVG system or a corner-connected SVG system may be determined based on cost.

In the flexible direct current converter valve direct current power transmission system, the star connection SVG system or the angle connection SVG system, the reactor and the power module string are installed separately. Since the reactor is a high-voltage power device, it is necessary to separately design not only the installation position of the reactor but also the installation member of the reactor for safety reasons. This results in a high difficulty and a high cost in installing the reactor.

Based on the above technical problem, the present invention provides an integrated power module. Fig. 6 is a schematic structural diagram of an integrated power module according to an embodiment of the invention. As shown in fig. 6, the integrated power module 400 includes cascaded N power cells 402 and a first reactor assembly 404.

The N cascaded power units 402 are arranged on the insulating base plate in a cascaded sequence and located between the first conductive side plate and the second conductive side plate, wherein the first conductive side plate and the second conductive side plate are arranged on two sides of the insulating base plate, and N is an integer greater than or equal to 4.

The first reactor assembly 404 is disposed between the first electrically conductive side plate and the first stage power cell 402, the first electrical interface a11 of the first reactor assembly 404 is connected to the first electrically conductive side plate, and the second electrical interface a12 of the first reactor assembly 404 is connected to the first stage power cell 402.

Optionally, the first electrical interface a11 of the first reactor assembly 404 is connected to the first conductive side plate by a copper bar.

Alternatively, where the N power cells 402 are arranged in a cascaded order, one electrical interface of the ith power cell 402 is connected to the electrical interface of the (i + 1) th power cell 402, i ∈ [1, N-1 ]. The number of N may be determined by the voltage rating and economy of the devices in power cell 402.

For example, if N is 5, the integrated power module 400 uses an IGBT device with a low voltage of 1700V withstand voltage class, the ac port voltage of each power cell 402 is 600V, and the ac port voltage of the integrated power module 400 is 3000V.

Fig. 7 is a circuit diagram of an integrated power module 400 according to an embodiment of the invention. As shown in fig. 7, the cascaded N power cells 402 are connected to the first reactor assembly 404 to realize the integration of the N power cells 402 and the first reactor assembly 404 together to form the integrated power module 400.

Alternatively, the last stage power unit 402 may be connected to the second conductive side plate.

In the embodiment of the present invention, the integrated power module 400 is obtained by integrating the first reactor component 404 and the cascaded N power units 402. Thus, the integrated power module 400 is mounted, so that the N power units 402 and the first reactor component 404 are mounted, the mounting position and the mounting part of the first reactor component 404 do not need to be designed independently, and the problems of high difficulty and high mounting cost of the reactor are solved. In addition, the embodiment of the invention integrates the first reactor component in the integrated power module. If a plurality of integrated power modules are cascaded to form an integrated power module string, compared with the prior art in which one reactor is connected to one power module string, the embodiment of the invention divides one reactor connected to one power module string into a plurality of parts and integrates the parts into each power module in the power module string, so that the voltage level of the first reactor assembly can be prevented from being too high, and a relatively large distance needs to be kept between the first reactor assembly and other devices. Therefore, the electric gap of the first reactor component is small, other devices cannot be placed in a large range around the first reactor component, and the first reactor component is prevented from occupying a large area.

In one or more embodiments of the present invention, in order to integrate the first current detection unit and the second current detection unit. Fig. 8 is a circuit diagram of an integrated power module 400 according to another embodiment of the invention. As shown in fig. 8, the first reactor assembly 404 includes a first current detection unit 4042, a first reactor 4044, and a second current detection unit 4046, which are connected in series in this order.

The first electrical interface a11 is one electrical interface of the first reactor 4044, and the second electrical interface a12 is the other electrical interface of the first reactor 4044.

The first current detection unit and the second current detection unit are respectively used for detecting the current on the line where the first current detection unit and the second current detection unit are located, and the currents detected by the first current detection unit and the second current detection unit are used for controlling the N power units 402.

Alternatively, the first and second

current detection units

4042 and 4046 may be current sensors.

In the embodiment of the present invention, the first current detection unit 4042 and the second current detection unit 4046 are integrated into the integrated power module 400, so that it is not necessary to separately design the installation position and the installation component for the first current detection unit 4042 and the second current detection unit 4046, and the installation work of the first current detection unit 4042 and the second current detection unit 4046 is saved.

In one or more embodiments of the invention, another integrated power module 400 is provided to avoid excessive volume occupied by the reactor assembly when installed. Fig. 9 is a schematic structural diagram of an integrated power module 400 according to another embodiment of the present invention. As shown in fig. 9, the integrated power module 400 further includes a second reactor assembly 406.

The second reactor assembly 406 is disposed between the second electrically conductive side plate and the last stage power cell 402, the third electrical interface a31 of the second reactor assembly is connected to the second electrically conductive side plate, and the fourth electrical interface a32 of the second reactor assembly is connected to the last stage power cell 402.

In one or more embodiments of the invention, the second reactor assembly 406 includes a second reactor; one electrical interface of the second reactor is a third electrical interface, and the other electrical interface of the second reactor is a fourth electrical interface.

Fig. 10 is a circuit diagram of an integrated power module 400 according to another embodiment of the invention. As shown in fig. 10, the second reactor assembly 406 includes a second reactor 4062, and two electrical interfaces of the second reactor 4062 are connected to the second conductive side plate and the final stage power unit 402, respectively.

In the embodiment of the invention, the reactor component is divided into two parts to avoid the overlarge reactance value of the reactor in each reactor component, thereby avoiding the overlarge occupied volume when the reactor is installed.

In one or more embodiments of the invention, integrated power module 400 further includes an integrated component that includes a first sub-componentization unit and a second sub-componentization unit.

The two electrical interfaces of the first sub-componentization unit are respectively connected to the first electrical interface and the third electrical interface, and the two electrical interfaces of the second sub-componentization unit are respectively connected to the first-stage power unit and the last-stage power unit.

The first sub-composition unit comprises at least one of: the lightning arrester, the first voltage detection unit and the bypass thyristor unit; the bypass thyristor unit comprises two thyristors in inverse parallel connection or a bidirectional thyristor; in a case where the first sub-composition unit includes the above at least two terms, the at least two terms are connected in parallel.

The second sub-composition unit comprises at least one of: and the second voltage detection unit and the bypass switch are connected in parallel under the condition that the second sub-integration unit comprises the second voltage detection unit and the bypass switch.

Optionally, one of the electrical interfaces of the first sub-componentization unit is connected to the first conductive side plate so that the one of the electrical interfaces of the first sub-componentization unit is connected to the first electrical interface; the other electrical interface of the first sub-componentization unit is connected to the second conductive side plate so that the other electrical interface of the first sub-componentization unit is connected to the third electrical interface.

As an example, fig. 11 is a schematic structural diagram of an integrated power module 400 according to still another embodiment of the present invention. As shown in fig. 11, two electrical interfaces (a21 and a22) of the integrated component 408 are respectively connected to the first conductive side plate and the second conductive side plate through copper bars, and the other two electrical interfaces (a23 and a24) of the integrated component 408 are respectively connected to the first power unit 402 and the last power unit 402 through copper bars.

As an example, fig. 12 is a schematic circuit structure diagram of an integrated power module 400 according to still another embodiment of the present invention. As shown in fig. 12, integrated power module 400 further includes an integrated component 408, and integrated component 408 includes a first sub-integration unit 4082 and a second sub-integration unit 4084.

The first sub-integration unit 4082 includes a lightning arrester 40822, a first voltage detection unit 40824, two

antiparallel thyristors

40826 and 40828. The lightning arrester 40822, the first voltage detection unit 40824, the thyristor 40826 and the thyristor 40828 are connected in parallel, and the two electrical interfaces (a21 and a22) of the first sub-quantization unit 4082 obtained by the parallel connection are connected to the first conductive side plate and the second conductive side plate through copper bars, respectively.

The second sub-composition unit 4084 includes a bypass switch 40842 and a second voltage detection unit 40844. The bypass switch 40842 and the second voltage detection unit 40844 are connected in parallel, and the two electrical interfaces (a23 and a24) of the second sub-quantization unit 4084 resulting from the parallel connection are connected to the first-stage power unit and the last-stage power unit, respectively, through copper bars.

The integrated power module 400 shown in fig. 12 is an embodiment of the present invention. The integrated power module 400 according to the present invention may be an integrated power module as shown in fig. 13.

The various components of the integrated assembly 408 are described below.

First, the first voltage detection unit and the second voltage detection unit in the integrated module 408 will be described. The first voltage detection unit 40824 is configured to detect a voltage between the first electrical interface and the third electrical interface, and the second voltage detection unit 40844 is configured to detect a voltage between the second electrical interface and the fourth electrical interface. The voltage detected by the first voltage detection unit and the voltage detected by the second voltage detection unit are combined with the current detected by the first current detection unit 4042 and the second current detection unit 4046 to control the cascaded N power units 402.

The lightning arrester 40822 in the integrated package 408 is explained below. The surge arrester 40822 can prevent surge voltage and protect the integrated power module 400.

Bypass switch 40842, thyristor 40826 and thyristor 40828 of integrated assembly 408 are described below in conjunction with fig. 14-15.

Fig. 14 is a schematic diagram of the operation of the switch bypass during a fault of the integrated power module 400 according to an embodiment of the present invention. As shown in fig. 14, when the integrated power module 400 fails, the cascaded N power units 402 need to be bypassed in time, and then the bypass switch 40842 triggers closing to complete the bypass operation. Therefore, the reliability of the whole system is improved, and the shutdown fault is avoided.

Fig. 15 is a schematic diagram of the operation of the thyristor redundancy bypass in case of failure of the integrated power module 400 according to an embodiment of the present invention. When the current input to the integrated power module 400 is positive and the integrated power module 400 fails, the thyristor 40826 is triggered to turn on the function of the redundancy bypass. When the bypass switch 40842 fails, the cascaded N power units 402 can be bypassed by the thyristor 40826, thereby improving the reliability of the converter.

Fig. 16 is a schematic diagram of the operation of the thyristor redundancy bypass in case of failure of the integrated power module 400 according to another embodiment of the present invention. When the current input to the integrated power module 400 is negative and the integrated power module 400 fails, the thyristor 40828 triggers to turn on the function of the redundancy bypass. When the bypass switch 40842 fails, the cascaded N power units 402 can be bypassed by the thyristor 40828, thereby improving the reliability of the converter.

In the embodiment of the present invention, by integrating the integrated component 408 into the integrated power module 400, the installation position and the installation component of the integrated component 408 do not need to be separately designed, and the installation cost of each device in the integrated component 408 is saved.

In one or more embodiments of the invention, integrated power module 400 further comprises: an insulating case and a first control interface for communicating the integrated power module 400 with an external controller;

wherein, integrate subassembly 408 and set up in the insulating box, the interface that links to each other with first control interface includes at least one of following: the lightning arrester comprises an information transmission interface of the lightning arrester, an information transmission interface of a first voltage detection unit, a control interface of a bypass thyristor unit, an information transmission interface of a second voltage detection unit and a control interface of a bypass switch.

An embodiment of the present invention is described below with reference to fig. 17. Fig. 17 is a schematic structural view of an insulation box according to an embodiment of the present invention. As shown in fig. 17, integrated assembly 408 is disposed within an insulating housing 410. Insulated housing 410 is provided with four electrical interfaces (i.e., electrical interface a21, electrical interface a22, electrical interface a23, and electrical interface a24) for integrated package 408. The insulating case 410 is also provided with a first control interface a25, and the first control interface a25 is used for communicating the integrated power module 400 with an external controller.

Embodiments of the present invention are further described below in conjunction with fig. 18. Fig. 18 is a schematic diagram illustrating the operation principle of signal transmission of the integrated power module 400 according to an embodiment of the present invention. As shown in fig. 18, signals of each device in the integration component 408 are communicated with an external controller through a first control interface a25, wherein the signals of each device in the integration component 408 communicated with the external controller include at least one of: the lightning arrester comprises a switching value state detection signal of the lightning arrester, a power supply signal and a detection signal of a first voltage detection unit, power supply signals, control signals and feedback signals of two thyristors which are connected in reverse parallel, a power supply signal, a control signal and a feedback signal of a bypass switch, and a power supply signal and a detection signal of a second voltage detection unit.

In addition, the first reactor assembly 404 may further include a first temperature sensor for detecting the temperature of the first reactor 4044. The power supply signal and the sampling signal of the first current detection unit 4042, the power supply signal and the sampling signal of the second current detection unit 4046, and the temperature signal of the first reactor in the first reactor component 404 are integrated and collected to interact with an external controller.

The second reactor assembly 406 may further comprise a second temperature sensor for detecting the temperature of the second reactor 4062. The temperature signal detected by the second temperature sensor interacts with an external controller.

In one or more embodiments of the invention, an insulating case is disposed above the N power cells 402.

In one or more embodiments of the invention, each power cell 402 is a full bridge power cell 402 comprising a dump cell or a half bridge power cell 402 comprising a dump cell.

The following describes an embodiment of the present invention with reference to fig. 19, taking the power unit 402 as a full-bridge power unit including an energy dump unit as an example.

Fig. 19 is a schematic diagram of a full-bridge power cell including an energy dump unit according to an embodiment of the present invention. As shown in fig. 19, the full-bridge power unit 402 includes: the energy-discharging device comprises a full-bridge alternating-current port lightning arrester 4022, a first half-bridge upper tube IGBT device 4024, a first half-bridge lower tube IGBT device 4026, a second half-bridge upper tube IGBT device 4028, a second half-bridge lower tube IGBT device 4030, a supporting capacitor 4032, an energy-discharging IGBT device 4034 and an energy-discharging resistor 4036.

Wherein, the emitter of first upper half-bridge IGBT device 4024 is connected to the collector of first lower half-bridge IGBT device 4026. The emitter of the first half-bridge upper tube IGBT device 4024 is also connected to an electrical interface of the full-bridge ac port arrester 4022.

The emitter of the second half-bridge upper tube IGBT device 4028 is connected to the collector of the second half-bridge lower tube IGBT device 4030. The emitter of the second half-bridge upper tube IGBT device 4028 is also connected to the other electrical interface of the full-bridge ac port arrester 4022.

The collector of the first half-bridge top IGBT device 4024, the collector of the second half-bridge top IGBT device 4028, one electrical interface of the support capacitor 4032, and the collector of the dump IGBT device 4034 are connected as the anode of the full-bridge power unit 402.

The emitter of the first half-bridge lower tube IGBT device 4026, the emitter of the second half-bridge lower tube IGBT device 4030, the other electrical interface of the support capacitor 4032, and one electrical interface of the dump resistor 4036 are connected to serve as the cathode of the full-bridge power unit 402.

The energy dump unit comprises an energy dump IGBT device 4034 and an energy dump resistor 4036. The emitter of dump IGBT device 4034 is connected to the other electrical interface of dump resistor 4036.

The full-bridge ac port arrester 4022 can prevent surge voltage and protect the power unit 402.

The full-bridge power unit according to the embodiment of the present invention will be described with reference to fig. 20 to 28.

Fig. 20 is a schematic diagram illustrating a current flow direction of a full bridge power cell according to an embodiment of the present invention. As shown in fig. 20, when the port voltage of the full-bridge power cell 402 is a positive voltage and the current i input to the full-bridge power cell 402 is greater than 0, the current passes from one electrical interface of the full-bridge power cell 402, through the anti-parallel diode of the first half-bridge upper tube IGBT device 4024, the support capacitor 4032, the anti-parallel diode of the second half-bridge lower tube IGBT device 4030, and to the other electrical interface of the full-bridge power cell 402. The port voltage of the full bridge power cell 402 is + Uc.

Fig. 21 is a schematic diagram illustrating a current flow direction of a full bridge power cell according to another embodiment of the present invention. As shown in fig. 21, when the port voltage of the full-bridge power cell 402 is a positive voltage and the current i input to the full-bridge power cell 402 is less than 0, the current passes from the other electrical interface of the full-bridge power cell 402, through the second half-bridge lower tube IGBT device 4030, the support capacitor 4032, and the first half-bridge upper tube IGBT device 4024, and to the one electrical interface of the full-bridge power cell 402. The port voltage of the full bridge power cell 402 is + Uc.

Fig. 22 is a schematic diagram illustrating the current flow direction of the full-bridge power unit 402 according to another embodiment of the present invention. As shown in fig. 22, when the port voltage of the full-bridge power cell 402 is a negative voltage and the current i input to the full-bridge power cell 402 is greater than 0, the current passes from one electrical interface of the full-bridge power cell 402, through the first half-bridge lower tube IGBT device 4026, the support capacitor 4032, and the second half-bridge upper tube IGBT device 4028, to the other electrical interface of the full-bridge power cell 402. The port voltage of the full bridge power cell 402 is-Uc.

Fig. 23 is a schematic diagram illustrating the current flow direction of a full-bridge power cell 402 according to still another embodiment of the present invention. As shown in fig. 23, when the port voltage of the full-bridge power cell 402 is a negative voltage and the current i input to the full-bridge power cell 402 is less than 0, the current passes from the other electrical interface of the full-bridge power cell 402 to the one electrical interface of the full-bridge power cell 402 through the diode antiparallel to the second upper half-bridge IGBT device 4028, the support capacitor 4032, and the diode antiparallel to the first lower half-bridge IGBT device 4026. The port voltage of the full bridge power cell 402 is-Uc.

Fig. 24 is a schematic diagram illustrating the current flow direction of the full bridge power unit 402 in the bypass state according to an embodiment of the invention. As shown in fig. 24, when the current i input to the full-bridge power cell 402 is > 0 and the support capacitor 4032 is bypassed, the current passes from one electrical interface of the full-bridge power cell 402, through the first half-bridge upper IGBT device 4024 antiparallel diode and the second half-bridge upper IGBT device 4028 to the other electrical interface of the full-bridge power cell 402. The port voltage of the full bridge power cell 402 is 0.

Fig. 25 is a schematic diagram illustrating the current flow direction of the full bridge power unit 402 in the bypass state according to another embodiment of the present invention. As shown in fig. 25, when the current i input to the full-bridge power cell 402 is less than 0 and bypasses the support capacitor 4032, the current flows from the other electrical interface of the full-bridge power cell 402 to the one electrical interface of the full-bridge power cell 402 through the second half-bridge down tube IGBT device 4030 and the first half-bridge down tube IGBT device 4026 antiparallel diode. The port voltage of the full bridge power cell 402 is 0.

Fig. 26 is a schematic diagram illustrating the current flow direction of the full bridge power unit 402 in the blocking state according to an embodiment of the present invention. As shown in fig. 26, when the current i input to the full-bridge power cell 402 is greater than 0 and the full-bridge power cell 402 is in the locked state, the current passes from one electrical interface of the full-bridge power cell 402 to the other electrical interface of the full-bridge power cell 402 through the anti-parallel diode of the first half-bridge upper tube IGBT device 4024, the support capacitor 4032, and the anti-parallel diode of the second half-bridge lower tube IGBT device 4030, and the port voltage of the full-bridge power cell 402 is + Uc.

Fig. 27 is a schematic diagram illustrating a current flow direction of the full bridge power unit 402 in a blocking state according to another embodiment of the present invention. As shown in fig. 27, when the current i input to the full-bridge power cell 402 is less than 0 and the full-bridge power cell 402 is in the locked state, the current passes from the other electrical interface of the full-bridge power cell 402 to the one electrical interface of the full-bridge power cell 402 through the diode antiparallel to the second upper half-bridge IGBT device 4028, the support capacitor 4032, and the diode antiparallel to the first lower half-bridge IGBT device 4026. The port voltage of the full bridge power cell 402 is-Uc.

Fig. 28 is a schematic diagram of the current flow direction of the full bridge power unit 402 in the power off state according to an embodiment of the invention. As shown in fig. 28, when the integrated power module 400 has a failure such as low voltage ride through, the voltage of the integrated power module 400 becomes too high, and the energy dump IGBT device 4034 turns on based on this, and the overvoltage on the support capacitor 4032 is dissipated to the energy dump resistor 4036, so that the overvoltage of the power cell 402 is suppressed.

The integrated power module 400 will be described based on the full-bridge power unit shown in fig. 19 with reference to fig. 29.

Fig. 29 is a schematic diagram of a positive current passing through an integrated power module 400 according to an embodiment of the invention. As shown in fig. 29, when the current input to the integrated power module 400 is positive, that is, when the current i > 0, the current flows from the first electrical interface of the integrated power module 400 to the first current detection unit 4042 on the grid side, the first reactor 4044, the second current detection unit 4046 on the module side, the N cascaded full-bridge power units 402, the second reactor 4062, and the third electrical interface of the integrated power module 400 in this order.

Fig. 30 is a schematic diagram of a negative current pass integrated power module 400 according to an embodiment of the invention. As shown in fig. 30, when the current input to the integrated power module 400 is negative, that is, when the current i < 0, the current flows from the third electrical interface of the integrated power module 400 through the second reactor 4062, the N cascaded full-bridge power cells 402, the module-side second current detection unit 4046, the first reactor 4044, the grid-side first current detection unit 4042, and the first electrical interface of the integrated power module 400 in this order.

The first current detection unit 4042 on the power grid side is used for detecting the current on the power grid side, the first voltage detection unit on the power grid side is used for detecting the voltage on the power grid side, the second current detection unit 4046 on the module side is used for detecting the current on the module side, and the second voltage detection unit on the module side is used for detecting the voltage on the module side. The amplitude and phase of the voltage of the integrated power module 400 are controlled according to the currents detected by the first and second current detecting

units

4042 and 4046 and the voltages detected by the first and second voltage detecting units to control the converter.

The following describes an embodiment of the present invention with reference to fig. 31, taking a power unit 402 as an example of a half-bridge power unit including an energy dump unit.

Fig. 31 is a schematic diagram of a half-bridge power cell including an energy dump unit according to an embodiment of the present invention. As shown in fig. 31, the half-bridge power unit 402 includes: the power supply device comprises a half-bridge alternating-current port lightning arrester 4022 ', a protective thyristor 4038 ', a first half-bridge upper tube IGBT device 4024 ', a first half-bridge lower tube IGBT device 4026 ', a support capacitor 4032 ', an energy-discharging IGBT device 4034 ' and an energy-discharging resistor 4036 '.

The emitter of dump IGBT device 4034 'is connected to one electrical interface of dump resistor 4036'.

The emitter of first half-bridge upper IGBT device 4024 'is connected to the collector of first half-bridge lower IGBT device 4026'. The emitter of the first half-bridge upper IGBT device 4024 ' is also connected to an electrical interface of the half-bridge ac port arrester 4022 ' and the cathode of the protection thyristor 4038 ', respectively.

The collector of first half-bridged IGBT device 4024 ', one electrical interface of support capacitor 4032 ', and the collector of dump IGBT device 4034 ' are connected.

The emitter of the first half-bridge underbridge IGBT device 4026 ', the other electrical interface of the half-bridge ac port arrester 4022 ', the anode of the protection thyristor 4038 ', the other electrical interface of the support capacitor 4032 ', and the other electrical interface of the dump resistor 4036 ' are connected.

The half-bridge ac port arrester 4022' can prevent surge voltage and protect the power unit 402.

The integrated power module 400 will be described based on the half-bridge power unit 402 shown in fig. 31 with reference to fig. 32.

Fig. 32 is a schematic structural diagram of an integrated power module 400 according to still another embodiment of the present invention. As shown in fig. 32, the integrated power module 400 includes: the power supply system comprises a lightning arrester 40822, a first grid-side current detection unit 4042, a grid-side voltage detection unit 40824, a first bypass thyristor 40826, a second bypass thyristor 40828, a first reactor 4044, a second reactor 4062, a bypass switch 40842, a module-side second current detection unit 4046, a module-side second voltage detection unit 40844 and N cascaded half-bridge power units 402.

In the embodiment of the present invention, the braking device is divided into a plurality of energy discharging units, and the energy discharging units are integrated into the power unit 402, so that the power unit 402 has an energy discharging function. Thereby, no additional design of the mounting position and the mounting of the brake device is required.

In one or more embodiments of the invention, integrated power module 400 further includes a main water outlet line and a main water inlet line; each power unit 402 and the first reactor 4044 respectively include a water outlet pipe and a water inlet pipe, the water inlet pipe of each power unit 402 and the water inlet pipe of the first reactor 4044 are respectively communicated with the main water inlet pipeline, and the water outlet pipe of each power unit 402 and the water outlet pipe of the first reactor 4044 are respectively communicated with the main water outlet pipeline.

It should be noted that each power unit 402 and the first reactor 4044 respectively include a heat sink, and the water inlet pipe and the water outlet pipe of each power unit 402 are respectively connected to the heat sink in the power unit 402. The water inlet pipe and the water outlet pipe of the first reactor 4044 are connected to a radiator in the first reactor 4044.

The power unit 402 of an embodiment of the present invention is described below in conjunction with fig. 33.

Fig. 33 is a schematic diagram of a single power cell 402, according to an embodiment of the invention. As shown in fig. 33, one power unit 402 includes a power device component (including an IGBT device), a water-cooled discharge resistor 4023 (including a dump resistor), and a capacitor component 4025 (including a support capacitor). The water-cooling discharge resistor 4023 is arranged above the power device assembly and the capacitor assembly 4025, the power device assembly is connected with a waterway of the water-cooling discharge resistor 4023 in series, the power device assembly is connected with the water inlet pipe 40291, and the water-cooling discharge resistor 4023 is connected with the water outlet pipe 40292.

The external interfaces of one power unit 402 include an electrical interface 40272, an electrical interface 40273, and a control interface 40271.

A first reactor according to an embodiment of the present invention is described below with reference to fig. 34.

Fig. 34 is a schematic configuration diagram of a first reactor according to an embodiment of the present invention. As shown in fig. 34, the first reactor includes a water-cooled reactor, the first reactor includes a water outlet pipe 404441 and a water inlet pipe 404442, the water outlet pipe 404441 is communicated with the total water outlet pipe, and the water inlet pipe 404442 is communicated with the total water inlet pipe. The external interfaces of the first reactor include a control interface 40442, an electrical interface 404461, and an electrical interface 404462.

Optionally, the second reactor 4062 includes an outlet pipe and an inlet pipe, the outlet pipe of the second reactor 4062 is communicated with the main outlet pipe, and the inlet pipe of the second reactor 4062 is communicated with the main inlet pipe. The second reactor 4062 may be identical to the structure of the first reactor as shown in fig. 25.

In the embodiment of the invention, the water outlet pipe and the water inlet pipe are respectively arranged in the power unit 402 and the first reactor to dissipate heat of the power unit 402 and the first reactor, so that the temperature of the power unit 402 and the first reactor is prevented from being too high, and the service lives of the power unit 402 and the first reactor are prolonged.

In one or more embodiments of the invention, integrated power module 400 further includes a frame structure comprising: the insulating bottom plate, the first electrically conductive curb plate and the second electrically conductive curb plate.

In one or more embodiments of the invention, the frame structure of the integrated power module 400 further includes: and the insulating support columns are used for supporting the insulating bottom plate.

The frame structure of the integrated power module 400 according to the embodiment of the present invention will be described with reference to fig. 35.

Fig. 35 is a schematic diagram of a frame structure of an integrated power module 400 according to an embodiment of the present invention. As shown in fig. 35, the frame structure of the integrated power module 400 includes an insulating base plate 412, a first conductive side plate 414, a second conductive side plate 416, and four insulating support columns 418. The four insulating support columns 418 are respectively located at four corners of the insulating base plate 412 to support the insulating base plate 412.

Based on the above-described frame structure, the integrated power module 400 will be described below with reference to fig. 36.

Fig. 36 is a schematic structural diagram of an integrated power module 400 according to an embodiment of the present invention. As shown in fig. 36, the N power units 402 in cascade are sequentially disposed on the insulating base plate 412, and the first reactor assembly 4044 is disposed between the first conductive side plate and the first-stage power unit 402. The water inlet pipe of each power unit 402 and the water inlet pipe of the first reactor 4044 are respectively communicated with the main water inlet pipeline 422, and the water outlet pipe of each power unit 402 and the water outlet pipe of the first reactor are respectively communicated with the main water outlet pipeline 420.

In another aspect, an embodiment of the present invention provides a current transformer, including: n power module cluster integrates, and a power module cluster integrates includes cascaded M power module that integrates, and every power module that integrates can be above-mentioned arbitrary one power module 400 that integrates, and M is the integer that is more than or equal to 2.

In a further aspect, the embodiment of the invention provides a wind power plant power transmission system, which comprises the converter.

In one or more embodiments of the invention, the wind farm power transmission system is a flexible direct current converter valve direct current transmission system, the converter comprises three-phase six-leg arms, and one leg comprises an integrated power module string.

The dc transmission system of the flexible dc converter valve according to the embodiment of the present invention will be described with reference to fig. 37.

Fig. 37 is a schematic structural diagram of a dc transmission system with a flexible dc converter valve according to an embodiment of the invention. As shown in fig. 37, the flexible direct current converter valve dc power transmission system includes: a dc wind farm 502 (such as an offshore dc wind farm), an HVDC line 504, a converter and a grid 508. Wherein the converter comprises an MMC converter valve 506.

Wherein, the dc wind farm 502 delivers dc power to the MMC converter valve 506 through the HVDC line 504, and the MMC converter valve 506 converts the dc power into ac power and inputs it to the grid 508.

The MMC converter valve 506 is a three-phase six-leg cascade high-voltage device, and the MMC converter valve 506 includes: the bridge comprises an A-phase upper bridge arm, an A-phase lower bridge arm, a B-phase upper bridge arm, a B-phase lower bridge arm, a C-phase upper bridge arm and a C-phase lower bridge arm. The leg of each phase includes an integrated power module string, wherein a power module string includes a plurality of cascaded integrated power modules 400.

In one or more embodiments of the invention, the wind farm power transmission system is an SVG system, the converter comprises three-phase bridge arms, and one bridge arm comprises an integrated power module string.

An SVG system according to an embodiment of the present invention is described below with reference to fig. 38 and 39.

Fig. 38 is a schematic structural diagram of a star-connected SVG system according to an embodiment of the present invention. As shown in fig. 38, the star SVG system includes an a-phase integrated power module string 602, a B-phase integrated power module string 604, and a C-phase integrated power module string 606. An integrated power module string includes a plurality of integrated power modules 400 in cascade.

One electrical port of the phase a integrated power module string 602 is connected to a 35KV grid a; one electrical port of the phase-B integrated power module string 604 is connected with a 35KV power grid B; one electrical port of the phase-C integrated power module string 606 is connected to the 35KV grid C.

The other electrical port of the phase a integrated power module string 602, the other electrical port of the phase B integrated power module string 604, and the other electrical port of the phase C integrated power module string 606 are connected to form a star configuration.

Fig. 39 is a schematic structural diagram of a corner joint SVG system according to an embodiment of the present invention. As shown in fig. 39, the corner joint SVG system includes: a phase a integrated power module string 702, a phase B integrated power module string 704, and a phase C integrated power module string 706.

One electrical port of the phase-A integrated power module string 702 is connected with a 35KV power grid A; one electrical port of the B-phase integrated power module string 704 is connected with a 35KV power grid B; one electrical port of the C-phase integrated power module string 706 is connected to the 35KV grid C.

The other electrical port of the phase-a integrated power module string 702 is connected to the electrical port of the phase-B integrated power module string 704 and connected to the phase-B of the 35KV grid; the other electrical port of the phase-B integrated power module string 704 is connected to the phase-C integrated power module string 706 and to the electrical port of the phase-C of the 35KV grid; the other electrical port of the C-phase integrated power module string 706 is connected to the a-phase electrical port of the a-phase integrated power module string 702 and to the 35KV grid, forming an angle joint SVG system.

It should be noted that, in the dc transmission system of the flexible direct current converter valve, the power unit in the converter may be a full-bridge power unit including an energy dump unit or a half-bridge power unit including an energy dump unit. In the SVG system, the power cells in the converter may be full-bridge power cells including an energy dump unit.

It is to be understood that the invention is not limited to the specific arrangements and instrumentality described above and shown in the drawings. A detailed description of known methods is omitted herein for the sake of brevity. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications and additions or change the order between the steps after comprehending the spirit of the present invention.

It should also be noted that the exemplary embodiments mentioned in this patent describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, may be performed in an order different from the order in the embodiments, or may be performed simultaneously.

As described above, only the specific embodiments of the present invention are provided, and it can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the module and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again. It should be understood that the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the present invention, and these modifications or substitutions should be covered within the scope of the present invention.

Claims

1. An integrated power module, comprising:

2. The integrated power module according to claim 1, wherein the first reactor component comprises a first current detection unit, a first reactor and a second current detection unit which are connected in series in this order;

wherein the first electrical interface is one electrical interface of the first reactor, and the second electrical interface is the other electrical interface of the first reactor;

the first current detection unit and the second current detection unit are respectively used for detecting the current on the line where the first current detection unit and the second current detection unit are located, and the currents detected by the first current detection unit and the second current detection unit are used for controlling the N power units.

3. The integrated power module of claim 1, further comprising:

a second reactor component disposed between the second conductive side plate and the last stage of the power unit, a third electrical interface of the second reactor component being connected to the second conductive side plate, and a fourth electrical interface of the second reactor component being connected to the last stage of the power unit.

4. The integrated power module of claim 3, wherein the second reactor component comprises a second reactor;

wherein one electrical interface of the second reactor is the third electrical interface, and the other electrical interface of the second reactor is the fourth electrical interface.

5. The integrated power module of claim 3, further comprising an integrated assembly including a first sub-integration unit and a second sub-integration unit;

the two electrical interfaces of the first sub-componentization unit are respectively connected to the first electrical interface and the third electrical interface, and the two electrical interfaces of the second sub-componentization unit are respectively connected to the first stage of the power unit and the last stage of the power unit;

the first sub-composition unit comprises at least one of: the lightning arrester, the first voltage detection unit and the bypass thyristor unit; the bypass thyristor unit comprises two thyristors in inverse parallel connection or a bidirectional thyristor; in a case where the first sub-composition unit includes the above at least two terms, the at least two terms are connected in parallel;

the second sub-composition unit comprises at least one of: a second voltage detection unit, a bypass switch, the second voltage detection unit and the bypass switch being connected in parallel in a case where the second sub-composition unit includes the second voltage detection unit and the bypass switch.

6. The integrated power module of claim 5, further comprising: the integrated power module comprises an insulating box body and a first control interface used for enabling the integrated power module to communicate with an external controller;

wherein, it is in to integrate the subassembly setting in the insulating box, with the interface that first control interface links to each other includes following at least one: the lightning arrester comprises an information transmission interface of the lightning arrester, an information transmission interface of the first voltage detection unit, a control interface of the bypass thyristor unit, an information transmission interface of the second voltage detection unit and a control interface of the bypass switch.

7. The integrated power module of claim 6, wherein the insulating case is disposed above the N power cells.

8. The integrated power module of claim 5,

one of the electrical interfaces of the first sub-componentization unit is connected to the first conductive side plate so as to be connected to the first electrical interface;

the other electrical interface of the first sub-componentization unit is connected to the third electrical interface by being connected to the second conductive side plate.

9. The integrated power module of claim 1, wherein each of the power cells is a full bridge power cell including an energy dump cell or a half bridge power cell including an energy dump cell.

10. The integrated power module of claim 2, further comprising a main water outlet line and a main water inlet line;

each power unit and the first reactor respectively comprise a water outlet pipe and a water inlet pipe, the water inlet pipe of each power unit and the water inlet pipe of the first reactor are respectively communicated with the main water inlet pipeline, and the water outlet pipe of each power unit and the water outlet pipe of the first reactor are respectively communicated with the main water outlet pipeline.

11. A current transformer, comprising:

an N integrated power module string, one said integrated power module string including cascaded M integrated power modules, each said integrated power module being an integrated power module as claimed in any one of claims 1 to 10, M being an integer greater than or equal to 2.

12. A wind farm power transmission system, comprising: the current transformer of claim 11.

13. A wind farm power transmission system according to claim 12, characterized in that the wind farm power transmission system is a Flex direct Current converter valve direct Current Transmission System,

the converter comprises six three-phase bridge arms, and one bridge arm comprises the integrated power module string.

14. A wind farm power transmission system according to claim 12, characterized in that the wind farm power transmission system is a Static Var Generator (SVG) system,

the converter comprises three-phase bridge arms, and one bridge arm comprises the integrated power module string.