WO2016029824A1 - Dispositif de conversion de tension continue et son procédé de commande de bras de pont - Google Patents

Dispositif de conversion de tension continue et son procédé de commande de bras de pont Download PDF

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Publication number
WO2016029824A1
WO2016029824A1 PCT/CN2015/087796 CN2015087796W WO2016029824A1 WO 2016029824 A1 WO2016029824 A1 WO 2016029824A1 CN 2015087796 W CN2015087796 W CN 2015087796W WO 2016029824 A1 WO2016029824 A1 WO 2016029824A1
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Prior art keywords
cascade structure
module
sub
voltage
cascade
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PCT/CN2015/087796
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English (en)
Chinese (zh)
Inventor
杨杰
贺之渊
汤广福
庞辉
***
Original Assignee
国家电网公司
国网智能电网研究院
中电普瑞电力工程有限公司
国网浙江省电力公司
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Priority claimed from CN201410421629.3A external-priority patent/CN105375757B/zh
Priority claimed from CN201510153175.0A external-priority patent/CN106160463B/zh
Application filed by 国家电网公司, 国网智能电网研究院, 中电普瑞电力工程有限公司, 国网浙江省电力公司 filed Critical 国家电网公司
Publication of WO2016029824A1 publication Critical patent/WO2016029824A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4837—Flying capacitor converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel

Definitions

  • the invention relates to a voltage conversion device in the field of flexible direct current transmission, in particular to a direct current voltage conversion device and a bridge arm control method thereof.
  • DC grid technology has no transmission distance limitation, no reactive power compensation equipment, strong flexibility and controllability, and can provide power supply for large cities and offshore wind power access. Good solutions have broad application prospects.
  • DC grid technology faces a voltage level conversion problem similar to that of an AC grid, and the research on DC voltage converters is still in a preliminary stage worldwide.
  • the main features of the DC voltage converter are as follows:
  • a wide range of voltage ratios can be achieved.
  • the diversity of DC voltage levels requires voltage converters to achieve a wide range of voltage ratios to meet the requirements of different applications;
  • a good DC transformer should meet the DC fault condition on one side and not affect the operation on the other side, that is, it has fault isolation capability;
  • a good DC transformer should have a low investment and a low loss level, and the corresponding components should not be too large to cause excessive land occupation.
  • the “Modular Multilevel DC/DC converter for HVDC applications” patent of WO 2014/056540 A1 discloses a novel DC-DC transformer topology of high voltage direct current transmission, in which a two-terminal module in a "face-to-face” topology is shared, effectively reducing The number, sub-modules, and footprint of the sub-modules that the system inputs are used, but the transformer isolation potential must be used.
  • the "Bidirectional Unisolated DC-DC converter based on cascaded cells" patent of WO 2013/026477 A1 discloses a bidirectional isolated DC-DC transformer based on a cascading battery, wherein the disclosed modular multi-level structure directly converted to DC, The transformer is eliminated, which effectively reduces the investment and land occupation.
  • the output on the low-voltage side still needs a large reactor or a conjugate reactor, and at the same time, for the fault isolation, an additional full-bridge sub-module is required.
  • the traditional low-voltage topology is difficult to apply to the high-voltage field.
  • the DC-DC transformer based on modular multi-level technology has received wide attention from its good expansion performance.
  • "face-to-face" type DC transformer based on modular multi-level technology connecting two AC/DC modular multi-level converters through AC transformer to carry out voltage conversion, which not only occupies a large area, but also has high cost and high loss. It is difficult to carry out extensive promotion.
  • an object of the present invention is to provide a DC voltage conversion device and a bridge arm control method thereof.
  • the technical solution provided by the present invention adopts a method in which a device serial structure and a sub-module are cascaded, Transformer In the case of voltage conversion, it also enables soft switching of series devices and reduces investment and footprint.
  • a brief summary is given below. This generalization is not a general comment, nor is it intended to identify key/critical constituent elements or to describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the following detailed description.
  • the invention provides a DC voltage conversion device, which is a single-phase, two-phase or two-phase structure, each phase consisting of a basic functional module, the improvement being that the basic functional module comprises a series device cascade Structure and submodule cascade structure.
  • the basic functional module includes two sets of device cascade structures S1 and S4 and a sub-module cascade structure connected in a star shape; one end of the sub-module cascade structure and one end of the device cascade structure S1 and the device respectively One end of the cascade structure S4 is connected; the other end of the device cascade structure S1 is connected to a low voltage terminal, the other end of the device cascade structure S4 is connected to a ground point; the other end of the sub-module cascade structure is connected to High voltage terminal.
  • the basic functional module includes two sets of device cascade structures S1 and S4 and a sub-module cascade structure connected in a star shape; one end of the sub-module cascade structure and one end of the device cascade structure S1 and the device respectively One end of the cascade structure S4 is connected; the other end of the device cascade structure S1 is connected to a high voltage terminal, and the other end of the device cascade structure S4 is connected to a low voltage terminal; the other end of the submodule cascade structure is connected to Grounding point.
  • the basic functional module includes four sets of device cascade structures S1, S4', S1' and S4 and a sub-module cascade structure; the device cascade structures S1 and S4' are connected between the high voltage terminal and the low voltage terminal The other two device cascade structures S1' and S4 are connected between the low voltage terminal and the ground point; one end of the submodule cascade structure is connected to the connection point between the device cascade structures S1 and S4', and the other end is connected to A connection point between the device cascade structure S1' and S4.
  • the device cascade structure is composed of a plurality of power electronic devices connected in series, the power electronic devices including fully-controlled devices (such as IGBT, GTO, etc.) and their anti-parallel diodes, semi-controlled devices (such as thyristors, etc.) Or a diode.
  • fully-controlled devices such as IGBT, GTO, etc.
  • semi-controlled devices such as thyristors, etc.
  • diode a diode.
  • the sub-module cascade structure is composed of a plurality of half-bridge sub-module cascade structures and a reactor in series, a full-bridge sub-module cascade structure and a reactor are connected in series or a full-bridge sub-module cascade structure and a half bridge
  • the module cascade structure is composed of a full bridge type device which is connected in series with a capacitor in parallel; the full bridge submodule is composed of an H bridge and a capacitor in parallel; each bridge arm of the H bridge is composed of Controlled devices (such as IGBT, GTO, etc.); each fully controlled device is anti-parallel diode.
  • the device includes at least two basic functional modules, a two-phase structure or a two-phase or more structure, that is, a transform unit, whose operating frequency is a fundamental frequency or a high frequency is formed.
  • the device cascade structure when the device cascade structure is turned on or off, the number of inputs of the sub-module cascade structure is adjusted, and the soft switching function of the device cascade structure is realized.
  • the invention also provides a bridge arm control method for a DC voltage conversion device, wherein the basic function module in the DC voltage conversion device realizes voltage conversion by bridge arm control; the improvement is that the method is based on the connection of the basic function module
  • Different ways include the following implementations:
  • the basic functional module comprises two sets of device cascade structures S1 and S4 and a sub-module cascade structure connected in a star shape; one end of the sub-module cascade structure is respectively connected with one end of the device cascade structure S1 and a device level One end of the connected structure S4 is connected; the other end of the device cascade structure S1 is connected to the low voltage terminal, and the other end of the device cascade structure S4 is connected to the ground Point; the other end of the sub-module cascade structure is connected to the high voltage terminal; when the device cascade structure S1 is turned on, the device cascade structure S4 is turned off, and the low voltage terminal positive current enters the submodule through the device cascade structure S1 Cascade structure, the voltage outputted by the cascaded structure of the sub-module is a voltage of a high voltage terminal minus a voltage of a low voltage terminal for compensating for a voltage difference between a high voltage terminal and a low voltage terminal; when the device cascade structure S4 is turned on, the device
  • the current difference between the low voltage end and the high voltage end is injected into the sub-module cascade structure through the device cascade structure S4, and the voltage outputted by the sub-module cascade structure is the high voltage end voltage, which is used for compensating the voltage difference between the high voltage end and the ground;
  • the basic function module includes two sets of device cascade structures S1 and S4 and a sub-module cascade structure connected in a star shape; one end of the sub-module cascade structure and one end of the device cascade structure S1 and the device cascade structure respectively One end of S4 is connected; the other end of the device cascade structure S1 is connected to a high voltage terminal, the other end of the device cascade structure S4 is connected to a low voltage terminal; the other end of the submodule cascade structure is connected to a ground point;
  • the device cascade structure S1 is turned on, the device cascade structure S4 is turned off, and the high voltage terminal positive current enters the submodule cascade structure through the device cascade structure S1, and the output voltage of the submodule cascade structure is The high voltage terminal voltage is used to compensate the voltage difference between the high voltage terminal and the ground; when the device cascade structure S4 is turned on, the device cascade structure S1 is turned off, and the low voltage terminal current is injected into the submodule cascade through the device
  • the basic functional module comprises four sets of device cascade structures S1, S4', S1' and S4 and a sub-module cascade structure connected in a star shape; the device cascade structures S1 and S4' are connected to the high voltage terminal and Between the low voltage terminals, the other two device cascade structures S1' and S4 are connected between the low voltage terminal and the ground point; one end of the submodule cascade structure is connected to the connection point between the device cascade structures S1 and S4'. The other end is connected to a connection point between the device cascade structures S1' and S4; when the device cascade structures S1 and S1' are turned on, the device cascade structures S4 and S4' are turned off, and the high voltage terminal positive current passes.
  • the device cascade structures S1 and S1' enter the sub-module cascade structure, and the output voltage of the sub-module cascade structure shown is a high voltage terminal voltage minus a low voltage terminal voltage for compensating for a voltage difference between the high voltage terminal and the low voltage terminal;
  • the junction structures S4 and S4' are turned on, the device cascade structures S1 and S1' are turned off, and the current difference between the low voltage terminal and the high voltage terminal is injected into the sub-module cascade structure through the device cascade structures S4 and S4'.
  • the output voltage of the sub-module cascade structure is the low voltage end Pressure for compensating for the low-side voltage difference.
  • the present invention also provides a DC voltage conversion device, which is improved in that the device includes a basic transformation unit composed of a unipolar structure or a bipolar structure that realizes DC power conversion.
  • the basic transformation unit is composed of two or more phase basic functional modules in parallel; and the DC power conversion is realized by the bridge arm control method.
  • the basic functional module includes two device cascade structures and a sub-module cascade structure connected in a star structure;
  • the remaining end of one of the device cascade structures is connected to the high voltage terminal positive terminal, and the remaining end of the other device cascade structure is connected to the ground point; the remaining end of the submodule cascade structure is connected to the low voltage terminal positive terminal.
  • the basic function module constitutes a multi-DC terminal basic function module having a plurality of DC voltage conversion capabilities by an additional sub-module cascade structure.
  • the device cascade structure is formed by a single control device and one of an anti-parallel diode, a half bridge submodule, and a full bridge submodule structure, or a plurality of them are connected in series. Or formed by the series inductance of the above structure; in the absence of power reverse demand, the full control type of the upper or lower arm in the basic functional module formed by the fully controlled device and its anti-parallel diode is omitted.
  • the device becomes a diode cascade or a series arrangement of diodes and inductors.
  • sub-module cascade structure is composed of a plurality of full bridge submodules or half bridge submodules, or multiple full bridges
  • the submodule or half bridge submodule is composed of a series connected inductor.
  • the full bridge sub-module is composed of an H-bridge shunt capacitor bank, and each bridge arm of the H-bridge is composed of a full-control device module and a diode connected in anti-parallel with the same, and the half-bridge sub-module is connected in parallel by a single-phase bridge arm.
  • a capacitor bank consisting of the upper and lower bridge arms, each of the bridge arm submodules being composed of a full control device module and a diode connected in anti-parallel thereto;
  • the full control device module is composed of a single full control device, or a full control device connected in series or in parallel, the capacitor group being composed of a single capacitor, or a plurality of capacitors connected in series or in parallel.
  • the invention also provides a bridge arm control method for a DC voltage conversion device, which is improved in that when the basic transformation unit is a single-phase basic function module, the bridge arm control method comprises the following steps:
  • the on-time of the upper arm and the lower arm of the basic function module are designed according to the balance setting manner, and the switching frequency setting range of the upper arm and the lower arm of the basic function module is not limited.
  • the balance setting mode adjusts the ratio of the opening time of the upper arm and the lower arm of the corresponding basic function module according to the voltage or energy fluctuation of the sub-module cascade structure.
  • the output of the sub-module cascade structure is adjusted to be soft-switched.
  • the technical solution provided by the present invention can realize a wide range of voltage conversion ratios.
  • the diversity of DC voltage levels requires voltage converters to achieve a wide range of voltage ratios to meet the requirements of different applications;
  • a good DC transformer should meet the DC fault condition on one side, and the operation on the other side is not affected, that is, it has fault isolation capability;
  • a good DC transformer should have a low investment and a low loss level, and the corresponding components should not be too large to cause excessive land occupation.
  • the DC voltage conversion device provided by the invention only uses IGBT series structure and a certain number of sub-modules to realize voltage conversion in series, with less investment and small loss, and at the same time, low-frequency operation has less improvement on loss; good DC transformer should be invested less With low loss levels;
  • the DC voltage conversion device provided by the invention has high voltage and current quality on the DC side, and no other filter is needed;
  • the DC voltage conversion device provided by the invention can effectively realize fault isolation; a good DC transformer should meet the DC fault condition on one side, and the operation on the other side is not affected, that is, it has fault isolation capability;
  • the DC voltage conversion device provided by the present invention has a wide range of variation ratio and a wide range of voltage conversion ratios.
  • the diversity of DC voltage levels requires voltage converters to achieve a wide range of voltage ratios to meet the requirements of different applications.
  • the DC voltage conversion device provided by the present invention has power flow capability. Due to the flexibility requirement of DC power regulation, correspondingly, the DC voltage converter needs to have bidirectional power adjustment capability.
  • FIG. 1 is a structural diagram of a half bridge or full bridge submodule provided by the present invention, wherein (a) is a half bridge submodule structure; (b) is a full bridge submodule structure;
  • FIG. 2 is a structural diagram of a basic function module provided by the present invention, wherein (a) is a basic functional module structure diagram 1; (b) is a basic function module structure diagram 2; (c) is a basic function module structure diagram 3;
  • FIG. 3 is a structural diagram of a three-phase transform unit provided by the present invention, wherein (a) is a three-phase transform unit structure diagram 1; (b) is a three-phase transform unit structure diagram 2; (c) is a three-phase transform unit structure diagram 3 .
  • FIG. 5 is a diagram showing the working mechanism of the basic function module provided by the present invention (multiple DC terminals);
  • FIG. 7 is a topological structural diagram of a multiphase transform unit provided by the present invention.
  • FIG. 9 is a structural diagram of a three-phase basic conversion unit of a three-DC terminal provided by the present invention.
  • the invention provides a DC voltage conversion device, which is a single-phase or multi-phase structure, each phase is composed of basic functional modules, including a device cascade structure and a sub-module cascade structure in series;
  • the basic functional module includes two sets of device cascade structures S1 and S4 and a sub-module cascade structure connected in a star shape; one end of the sub-module cascade structure is respectively cascaded with the device.
  • One end of the device and one end of the structure S1 S4 cascade structure is connected; the other end of the cascade structure of the device S1 is connected to low-voltage terminal (V L), the other end of the cascade structure device S4 is connected to ground; the The other end of the sub-module cascade structure is connected to the high voltage terminal (V H ).
  • the basic functional module includes two sets of device cascade structures S1 and S4 and a sub-module cascade structure connected in a star shape; one end of the sub-module cascade structure is respectively cascaded with the device One end of the structure S1 is connected to one end of the device cascade structure S4; the other end of the device cascade structure S1 is connected to a high voltage terminal (V H ), and the other end of the device cascade structure S4 is connected to a low voltage terminal (V L The other end of the sub-module cascade structure is connected to a ground point.
  • V H high voltage terminal
  • V L low voltage terminal
  • the basic functional module includes four sets of device cascade structures S1, S4', S1', and S4 and a sub-module cascade structure connected in a star shape; the device cascade structure S1 and S4' is connected between the high voltage terminal (V H ) and the low voltage terminal (V L ), and the other two device cascade structures S1' and S4 are connected between the low voltage terminal (V L ) and the ground point; One end of the junction structure is connected to the connection point between the device cascade structures S1 and S4', and the other end is connected to the connection point between the device cascade structures S1' and S4.
  • the device cascade structure is composed of a plurality of power electronic devices connected in series, the power electronic devices including fully controlled devices (such as IGBT, GTO, etc.) and their anti-parallel diodes, semi-controlled devices (such as thyristors, etc.) or diodes.
  • fully controlled devices such as IGBT, GTO, etc.
  • semi-controlled devices such as thyristors, etc.
  • the sub-module cascade structure is composed of a plurality of half-bridge sub-module cascade structures and reactors in series or a full-bridge sub-module cascade structure and a reactor connected in series, and the half-bridge sub-module is composed of a fully-controlled device series branch and a capacitor Parallel composition; the full bridge sub-module is composed of an H-bridge and a capacitor in parallel; each bridge arm of the H-bridge is composed of a fully-controlled device; each fully-controlled device (such as IGBT, GTO, etc.) is anti-parallel diode
  • the structure diagram of the half bridge or full bridge submodule is shown in Figures 1(a) and (b).
  • the basic function module can be extended to a two-phase structure, or the number of phases can be increased to three-phase or even more phases, and the three-phase transformation unit structure diagram is as shown in Figs. 3(a), (b) and (c), thereby forming a transformation unit.
  • the transform unit can in turn form a parallel or bipolar structure.
  • the operating frequency of the transform unit is not limited to the fundamental frequency, and may also be a high frequency operation.
  • Another advantageous feature of the DC converter topology of the present invention is that the soft switching of the device cascade structure can be effectively realized by adjusting the number of sub-module cascade inputs when the device cascade structure is turned on or off.
  • the invention also provides a bridge arm control method for a DC voltage conversion device, wherein the basic function module in the DC voltage conversion device realizes voltage conversion by bridge arm control;
  • the device cascade structure S1 when the device cascade structure S1 is turned on, the device cascade structure S4 is turned off, and the low-voltage terminal positive current enters the sub-module level through the device cascade structure S1.
  • the connection structure, the output voltage of the sub-module cascade structure is a high voltage terminal voltage minus a low voltage terminal voltage, used to compensate a voltage difference between the high voltage terminal and the low voltage terminal; when the device cascade structure S4 is turned on, the device cascade structure S1 is turned off.
  • the current difference between the low voltage end and the high voltage end is injected into the sub-module cascade structure through the device cascade structure S4, and the voltage outputted by the sub-module cascade structure is a negative high voltage terminal voltage, which is used to compensate the high voltage terminal to ground voltage difference.
  • the device cascade structure S1 when the device cascade structure S1 is turned on, the device cascade structure S4 is turned off, and the high voltage terminal positive current passes through the device cascade structure S1.
  • a module cascade structure wherein the voltage outputted by the cascaded structure of the submodule is a high voltage terminal voltage for compensating for a voltage difference between the high voltage terminal and the ground; when the device cascade structure S4 is turned on, the device cascade structure S1 is closed.
  • the low-voltage terminal current is injected into the sub-module cascade structure through the device cascade structure S4, and the voltage outputted by the sub-module cascade structure is a low-voltage terminal voltage for compensating for the low-voltage side-to-ground voltage difference.
  • the device cascade structures S1 and S1' are turned on, the device cascade structures S4 and S4' are turned off, and the high voltage terminal positive current passes through the device.
  • the cascaded structures S1 and S1' enter the sub-module cascade structure, and the output voltage of the sub-module cascade structure shown is the high-voltage terminal voltage minus the low-voltage terminal voltage, which is used to compensate the high-voltage end and the low voltage.
  • the sub-module cascade structure is injected, and the voltage outputted by the sub-module cascade structure is a low-voltage terminal voltage for compensating for a low-voltage terminal-to-ground voltage difference.
  • the DC voltage conversion device provided by the invention only adopts the device series structure and a certain number of sub-modules to realize voltage conversion in series, with less investment and small loss, and at the same time, the high-frequency operation has less improvement on the loss; the DC-side voltage and current quality at both ends is high. No additional filters are required; power flows in both directions with a wide range of ratios.
  • the invention provides a DC voltage conversion device, which has the following structure: the device comprises a basic transformation unit, and the basic transformation unit comprises a monopole structure or a bipolar structure to realize conversion of DC power.
  • the bipolar structure diagram is shown in Figure 8.
  • the basic transformation unit is composed of two-phase or multi-phase basic functional modules in parallel; the DC power conversion is realized by the bridge arm control method.
  • Fig. 4 is a basic functional block of the device, which is composed of two device cascade structures and one sub-module cascade structure, and the three are connected in a star structure. The other end of one device cascade structure is connected to the high voltage terminal positive terminal, and the other end of the other device cascade structure is connected to the ground point; the remaining end of the submodule cascade structure is connected to the low voltage terminal positive terminal.
  • the basic function module can form a multi-DC terminal basic function module with multiple DC voltage conversion capabilities through an additional sub-module cascade structure, as shown in FIG.
  • the device cascade structure is generally composed of a plurality of fully controlled devices (such as IGBT, GTO, etc.) and its anti-parallel diodes. There may be a series of reactances on the bridge arms. Another alternative is through multiple Figure 1(a).
  • the half bridge or the full bridge submodule shown in Figure 1(b) is connected in series to replace the full control device in series. It is also a feasible solution to mix the full control device with the half bridge and full bridge submodule.
  • the sub-module cascade structure is a series structure of a plurality of half bridge submodules shown in FIG. 1(a) or a full bridge submodule shown in FIG. 1(b), and a reactance may be connected in series on the bridge arm.
  • the full-control device of the upper or lower arm of the device cascade can be omitted, only diode cascade.
  • the sub-module cascade structure is formed by cascading a plurality of half bridge submodules or full bridge submodules, and may include a series inductor.
  • the sub-module is shown in Figure 1(b).
  • the full-control device symbol only represents the function. It can be composed of multiple control devices connected in series or in parallel.
  • the capacitance symbol is only representative of the function. It can also be composed of multiple capacitors connected in series or in parallel. .
  • the invention also provides a bridge arm control method for a DC voltage conversion device.
  • the basic transformation unit is composed of a single-phase basic function module, the working mechanism is as follows:
  • S1a, S2b and S2a, S1b generally operate as complementary pairs.
  • the high-voltage positive current Id1 enters the corresponding sub-module cascade structure through S1a, and the sub-module cascade structure outputs Ud1-Ud2 for compensating for the voltage difference between the high-voltage side and low-voltage side output terminals.
  • the current difference Id2-Id1 between the low voltage end and the high voltage end is injected into the sub-module cascade structure through S2b, and the sub-module cascade structure output -Ud2 is used to compensate the voltage difference between the low-voltage side output terminal and the ground.
  • the high-voltage positive current Id1 enters the corresponding sub-module cascade structure through S2a.
  • the sub-module cascade structure outputs Ud1-Ud2 to compensate the voltage difference between the high-voltage side and low-voltage side output terminals.
  • the current difference Id2-Id1 between the low voltage end and the high voltage end is injected into the sub-module cascade structure through S1b, and the sub-module cascade structure output -Ud2 is used to compensate the voltage difference between the low-voltage side output terminal and the ground.
  • the energy can be kept constant. If the energy of the cascaded structure of the two sub-modules is deviated due to errors, etc., the ratio of the input time of the two complementary pairs can be adjusted. To make adjustments.
  • the basic function module can be extended to the single-phase structure of Fig. 6, or the phase number can be increased to three-phase or even more phases (Fig. 7), thereby forming a basic transformation unit, and the three-phase basic three-phase basic transformation unit structure diagram is as shown in Fig. 9. It can be seen that the basic transformation unit can in turn form a bipolar structure by the form of FIG. At the same time, the operating frequency of the transform unit is not limited to the fundamental frequency, but may also be low frequency and high frequency operation.
  • Another advantageous feature of the topology result of the present invention is that the soft switching of the device cascade structure can be effectively realized by adjusting the number of sub-module cascade structures when the device cascade structure is turned on or off.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

Cette invention concerne un dispositif de conversion de tension continue et son procédé de commande de bras de pont. Ledit dispositif est une structure à une seule phase, à deux phases ou à plus de deux phases, chaque phase consistant en un module de fonction de base, le module de fonction de base comprenant des structures de dispositifs en cascade (S1, S4) connectées en série et une structure de sous-module en cascade. Par la combinaison des structures de dispositif connectées en série et de la structure de sous-module en cascade, il est possible d'assurer la conversion de tension sans transformateur, d'assurer la commutation douce de dispositifs connectés en série et de réduire les coûts et l'encombrement.
PCT/CN2015/087796 2014-08-25 2015-08-21 Dispositif de conversion de tension continue et son procédé de commande de bras de pont WO2016029824A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201410421629.3 2014-08-25
CN201410421629.3A CN105375757B (zh) 2014-08-25 2014-08-25 一种直流电压变换装置及其桥臂控制方法
CN201510153175.0 2015-04-01
CN201510153175.0A CN106160463B (zh) 2015-04-01 2015-04-01 一种直流电压变换装置及其桥臂控制方法

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170099007A1 (en) * 2014-03-25 2017-04-06 Gneral Electric Technology GmbH Voltage source converter and control thereof
EP3393030A4 (fr) * 2016-08-26 2019-04-17 Global Energy Interconnection Research Institute Co., Ltd. Système de conversion cc/cc et son procédé de commande
EP3346594A4 (fr) * 2015-09-02 2019-04-17 Tokyo Institute of Technology Circuit d'interruption périodique bidirectionnel
CN113381607A (zh) * 2021-06-08 2021-09-10 哈尔滨工业大学 一种低成本高效率高变比dc/dc变换器
EP3872974A4 (fr) * 2018-10-23 2022-07-27 Tokyo Institute of Technology Circuit d'interruption périodique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101814827A (zh) * 2010-04-09 2010-08-25 南京航空航天大学 两级式的高压输入低压大电流输出型直流变换器
CN102084586A (zh) * 2008-06-09 2011-06-01 Abb技术有限公司 电压源转换器
JP2014018028A (ja) * 2012-07-11 2014-01-30 Toshiba Corp 半導体電力変換装置
CN103715931A (zh) * 2012-09-28 2014-04-09 通用电气公司 多级转换器***

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102084586A (zh) * 2008-06-09 2011-06-01 Abb技术有限公司 电压源转换器
CN101814827A (zh) * 2010-04-09 2010-08-25 南京航空航天大学 两级式的高压输入低压大电流输出型直流变换器
JP2014018028A (ja) * 2012-07-11 2014-01-30 Toshiba Corp 半導体電力変換装置
CN103715931A (zh) * 2012-09-28 2014-04-09 通用电气公司 多级转换器***

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170099007A1 (en) * 2014-03-25 2017-04-06 Gneral Electric Technology GmbH Voltage source converter and control thereof
US9866138B2 (en) * 2014-03-25 2018-01-09 General Electric Company Gmbh Voltage source converter and control thereof
EP3346594A4 (fr) * 2015-09-02 2019-04-17 Tokyo Institute of Technology Circuit d'interruption périodique bidirectionnel
US10498233B2 (en) 2015-09-02 2019-12-03 Tokyo Institute Of Technology Bidirectional chopper circuit
EP3393030A4 (fr) * 2016-08-26 2019-04-17 Global Energy Interconnection Research Institute Co., Ltd. Système de conversion cc/cc et son procédé de commande
EP3872974A4 (fr) * 2018-10-23 2022-07-27 Tokyo Institute of Technology Circuit d'interruption périodique
US11888396B2 (en) 2018-10-23 2024-01-30 Tokyo Institute Of Technology Chopper circuit
CN113381607A (zh) * 2021-06-08 2021-09-10 哈尔滨工业大学 一种低成本高效率高变比dc/dc变换器
CN113381607B (zh) * 2021-06-08 2022-09-02 哈尔滨工业大学 一种低成本高效率高变比dc/dc变换器

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