CN109672344B - Bidirectional DC converter and control method thereof - Google Patents

Bidirectional DC converter and control method thereof Download PDF

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CN109672344B
CN109672344B CN201910054912.XA CN201910054912A CN109672344B CN 109672344 B CN109672344 B CN 109672344B CN 201910054912 A CN201910054912 A CN 201910054912A CN 109672344 B CN109672344 B CN 109672344B
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switch module
direct current
module
port
modules
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CN109672344A (en
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霍群海
熊佳旺
尹靖元
吴理心
韦统振
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Institute of Electrical Engineering of CAS
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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters

Abstract

The invention relates to the technical field of power electronic devices, in particular provides a bidirectional direct-current converter and a control method thereof, and aims to solve the technical problem of meeting the requirement of high-voltage high-power direct-current electric energy conversion. To this end, the present invention provides a bi-directional dc converter that basically comprises a first switch module and a second switch module. Specifically, the first switch module is connected with the positive electrode of the first dc port and is also connected with the negative electrode of the first dc port through the inductance module, and the negative electrode of the first dc port is directly connected with the negative electrode of the second dc port. The second switch module is connected with the positive electrode of the first direct current port and is also connected with the positive electrode of the second direct current port through the inductance module. The first capacitor is connected with the first switch module and the second switch module respectively. Based on the structure, the bidirectional direct current converter provided by the invention can perform high-voltage direct current electric energy conversion through the first switch module and the second switch module, so that the direct current electric energy requirement of a high-voltage or high-power load is met.

Description

Bidirectional DC converter and control method thereof
Technical Field
The invention relates to the technical field of power electronic devices, in particular to a bidirectional direct current converter and a control method thereof.
Background
The direct current converter based on the Super Boost topological structure has the characteristics of high power density, high efficiency, high reliability and the like, and can reliably convert direct current electric energy into direct current electric energy required by a load. However, the current direct current converter based on the Super Boost topological structure is only suitable for low-voltage or low-power loads, and cannot meet the direct current electric energy requirement of high-voltage or high-power loads.
Disclosure of Invention
The method aims to solve the problems in the prior art, namely the technical problem of how to meet the requirement of high-voltage high-power direct-current electric energy conversion. To this end, the present invention provides a bidirectional dc converter and a control method thereof.
In a first aspect, the bidirectional dc converter provided by the present invention mainly includes a first dc port, a second dc port, a first switch module, a second switch module, a first capacitor, and an inductance module;
one end of the first switch module is connected with the anode of the first direct current port, the other end of the first switch module is connected with the cathode of the first direct current port through the inductance module, and the cathode of the first direct current port is directly connected with the cathode of the second direct current port;
one end of the second switch module is connected with the anode of the first direct current port, and the other end of the second switch module is connected with the anode of the second direct current port through the inductance module;
one end of the first capacitor is connected with the other end of the first switch module, and the other end of the first capacitor is connected with the other end of the second switch module.
Further, an optional technical solution provided by the present invention is:
the inductance module includes a first inductor and a second inductor,
the other end of the first switch module is connected with the negative electrode of the first direct current port through the first inductor;
the other end of the second switch module is connected with the positive electrode of the second direct current port through the second inductor.
Further, an optional technical solution provided by the present invention is:
the number of the first switch module, the second switch module and the first capacitor is a plurality,
a plurality of the first switch modules are connected in series to form a first series branch, a first switch module in the first series branch is directly connected with the first direct current port, and a last switch module in the first series branch is directly connected with the first inductor;
a plurality of the second switch modules are connected in series to form a second series branch, a first second switch module in the second series branch is directly connected with the first direct current port, and a last second switch module in the second series branch is directly connected with the second inductor;
each first capacitor is respectively connected with a first switch module and a second switch module which are in the same series sequence.
Further, an optional technical solution provided by the present invention is:
the first switch module and the second switch module respectively comprise a plurality of series-connected fully-controlled semiconductor switches or power sub-modules.
Further, an optional technical solution provided by the present invention is:
the power sub-module is an MMC sub-module such as a half-bridge power sub-module, a full-bridge power sub-module or a clamping dual sub-module.
In a second aspect, the present invention provides a method for controlling a bidirectional dc converter, which mainly includes the following steps:
determining the input quantity of power sub-modules in the first switch module and the second switch module according to a preset direct current conversion requirement;
and respectively adjusting the working states of the power sub-modules corresponding to the input quantities in the first switch module and the second switch module to be input states according to the direct current conversion requirements, and adjusting the working states of other power sub-modules to be cut-off states.
Further, an optional technical solution provided by the present invention is:
the step of "respectively adjusting the operating states of the power sub-modules corresponding to the input numbers in the first switch module and the second switch module to be input states according to the dc conversion requirement" specifically includes:
determining the electric energy conversion direction of the bidirectional direct current converter according to the direct current conversion requirement;
and respectively adjusting the working states of the power sub-modules corresponding to the input quantities in the first switch module and the second switch module to be input states according to the electric energy conversion direction.
Further, an optional technical solution provided by the present invention is:
the step of "adjusting the operating states of the other power sub-modules to be the cut-off state" specifically includes:
and adjusting the working state of the power sub-module to be a cut-off state according to the electric energy conversion direction.
Further, an optional technical solution provided by the present invention is:
the control method further comprises the following steps:
and when the bidirectional direct current converter is started or the accessed direct current line has a fault, adjusting the working states of all the first switch modules and all the second switch modules to be a locking state according to the electric energy conversion direction.
Further, an optional technical solution provided by the present invention is:
the control method further comprises the following steps:
and controlling the port voltage of the first switch module and the second switch module by adopting a nearest level approximation modulation method.
Compared with the closest prior art, the technical scheme at least has the following beneficial effects:
1. the invention provides a bidirectional direct current converter which mainly comprises a first switch module, a second switch module, a first capacitor and an inductance module. Specifically, one end of the first switch module is connected to the positive electrode of the first dc port, the other end of the first switch module is connected to the negative electrode of the first dc port through the inductor module, and the negative electrode of the first dc port is directly connected to the negative electrode of the second dc port. One end of the second switch module is connected with the positive electrode of the first direct current port, and the other end of the second switch module is connected with the positive electrode of the second direct current port through the inductance module. One end of the first capacitor is connected with the other end of the first switch module, and the other end of the first capacitor is connected with the other end of the second switch module. The first switch module and the second switch module respectively comprise a plurality of power sub-modules. Based on the structure, the direct current converter provided by the invention not only can realize bidirectional direct current conversion, but also can perform high-voltage direct current electric energy conversion through the first switch module and the second switch module, thereby meeting the direct current electric energy requirement of a high-voltage or high-power load. Meanwhile, based on the Super Boost topological structure formed by the structure, compared with the conventional direct current converter, the direct current converter provided by the invention has higher power density, can realize higher Boost or buck transformation ratio, and further has the advantages of lower cost, smaller volume, easier realization and the like under the condition of the same large capacity.
Further, the bidirectional dc converter provided by the present invention may include a plurality of first switch modules, a plurality of second switch modules, and a plurality of first capacitors. Specifically, a plurality of first switch modules are connected in series to form a first series branch, a first switch module in the first series branch is directly connected with the first direct current port, and a last first switch module in the first series branch is directly connected with the first inductor. The plurality of second switch modules are connected in series to form a second series branch, the first second switch module in the second series branch is directly connected with the first direct current port, and the last second switch module in the second series branch is directly connected with the second inductor. Each first capacitor is respectively connected with a first switch module and a second switch module which are in the same series sequence. Based on the structure, the direct current converter provided by the invention can realize direct current electric energy conversion with higher voltage level through the plurality of first switch modules and the plurality of second switch modules, and further meet the direct current electric energy requirement of high-voltage or high-power loads.
2. The control method of the bidirectional direct current converter mainly comprises the following steps: and determining the input quantity of the power sub-modules in the first switch module and the second switch module according to a preset direct current conversion requirement. And determining the electric energy conversion direction of the bidirectional direct current converter according to the direct current conversion requirement. And respectively adjusting the working states of the power sub-modules corresponding to the input quantities in the first switch module and the second switch module to be input states according to the electric energy conversion direction, and adjusting the working states of other power sub-modules to be cut-off states. Based on the steps, the control method provided by the invention can selectively control the working state of each power sub-module in the first switch module and the second switch module according to the direct current conversion requirement, so that the bidirectional direct current converter can output the voltage meeting the direct current conversion requirement aiming at different power supplies, namely the multilevel input and output control of the bidirectional direct current converter is realized.
Drawings
Fig. 1 is a schematic diagram of a main structure of a bidirectional dc converter according to an embodiment of the present invention;
FIG. 2 is a schematic voltage/current direction diagram of the bidirectional DC converter shown in FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the AC voltage/current direction of the bidirectional DC converter shown in FIG. 1 according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an AC power flow path of the bidirectional DC converter of FIG. 1 according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the DC voltage/current direction of the bidirectional DC converter shown in FIG. 1 according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a DC power flow path of the bidirectional DC converter shown in FIG. 1 according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the principal structure of another bidirectional DC converter in accordance with an embodiment of the present invention;
FIG. 8 is a schematic diagram of the main structure of a half-bridge power sub-module in the embodiment of the present invention;
FIG. 9 is a schematic diagram of the main structure of a full-bridge power sub-module in the embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating the main steps of a method for controlling a bidirectional DC converter according to an embodiment of the present invention;
fig. 11 is a schematic voltage/current direction diagram of a half-bridge power sub-module in an embodiment of the present invention.
Fig. 12 is a diagram showing simulation results of the bidirectional dc converter in the embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
The bidirectional dc converter according to the present invention will be described with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 schematically shows a main structure of a bidirectional dc converter in the present embodiment. As shown in fig. 1, the bidirectional dc converter of this embodiment mainly includes a first dc port (a capacitor C in fig. 1)1In parallel with the first DC port), a second DC port (capacitor C in FIG. 1)2In parallel with the second dc port), a first switch module K, a second switch module R, a first capacitor C3And an inductance module, wherein the inductance module mainly comprises a first inductor L1And a second inductor L2。
Specifically, in this embodiment, one end of the first switch module K is connected to the positive electrode of the first dc port, and the other end of the first switch module K passes through the first inductor L1Connected to the negative pole of the first dc port. One end of the second switch module R is connected with the anode of the first DC port, and the other end of the second switch module R passes through the second inductor L2And is connected with the positive pole of the second direct current port. A first capacitor C3Is connected to the other end of the first switch module K (i.e. disposed between the first switch module K and the first inductor L)1In between), a first capacitor C3Is connected with the other end of the second switch module R (i.e. is arranged between the second switch module R and the second inductor L)2In between).
The following describes the dc conversion operation of the bidirectional dc converter shown in fig. 1 in this embodiment with reference to fig. 2 to 6.
Referring to fig. 2, fig. 2 schematically shows the voltage/current direction of the bidirectional dc converter shown in fig. 1 in the present embodiment, wherein the first dc port and the second dc port are the power input port and the power output port of the bidirectional dc converter, respectively, and the inductance ratio between the first inductor and the second inductor is 1: 1.
Assuming that all the components of the bidirectional dc converter shown in fig. 1 are ideal components, the voltage of the bidirectional dc converter is subjected to ac/dc decomposition by using a fourier transform algorithm, so as to obtain the port voltages U of the first switch module and the second switch module shown in the following formula (1) respectively1And U2：
Figure BDA0001952108030000061
The meaning of each parameter in the formula (1) is:
Figure BDA0001952108030000062
and
Figure BDA0001952108030000063
port voltage U of the first switching module, respectively1The alternating voltage component and the direct voltage component of (a),
Figure BDA0001952108030000064
and
Figure BDA0001952108030000065
port voltage U of the second switching module, respectively2Of the alternating voltage component and the direct voltage component, wherein the alternating voltage component
Figure BDA0001952108030000066
And
Figure BDA0001952108030000067
as shown in the following formula (2):
Figure BDA0001952108030000068
the meaning of each parameter in the formula (2) is:
Uj1is the j-th harmonic AC voltage amplitude, U, of the first switch modulej2Is the j-th harmonic AC voltage of the second switch moduleAmplitude, ω angular frequency, θjIs the phase angle.
Further, the current I of the first switch module and the current I of the second switch module shown in the following formula (3) can be obtained by performing ac-dc decomposition on the current of the bidirectional dc converter by using a fourier transform algorithm1And I2：
Figure BDA0001952108030000069
The meaning of each parameter in the formula (3) is:
Figure BDA00019521080300000610
and
Figure BDA00019521080300000611
respectively, port current I of the first switch module1The alternating current component and the direct current component of (a),
Figure BDA00019521080300000612
and
Figure BDA00019521080300000613
respectively, port current I of the second switch module2Of the alternating current component and the direct current component, wherein the alternating current component
Figure BDA00019521080300000614
And
Figure BDA00019521080300000615
as shown in the following formula (4):
Figure BDA0001952108030000071
the meaning of each parameter in the formula (4) is:
Ij1is the j-th harmonic AC current amplitude, I, of the first switch modulej2Is the amplitude of the j-th harmonic AC current of the second switching module, ω is the angular frequency, θjIs the phase angle.
With continued reference to fig. 3 and 4, fig. 3 schematically illustrates the ac voltage/current direction of the bidirectional dc converter shown in fig. 1 in the present embodiment, and fig. 4 schematically illustrates the ac power flow path of the bidirectional dc converter shown in fig. 1 in the present embodiment. As shown in fig. 4, a portion of the ac power stored at the first switching module K is stored at the capacitor C and the first inductor, and a portion is discharged through the second dc port. A portion of the ac energy stored on the second switching module R is stored on the second inductor and a portion is discharged through the second dc port. Ac input current of the bidirectional dc converter in this embodiment
Figure BDA0001952108030000072
AC output current
Figure BDA0001952108030000073
Current of capacitor C
Figure BDA0001952108030000074
And an AC output voltage
Figure BDA0001952108030000075
Respectively, as shown in the following formula (5):
Figure BDA0001952108030000076
parameters in equation (5)
Figure BDA0001952108030000077
Is the voltage of the capacitor C.
With continued reference to fig. 5 and 6, fig. 5 schematically illustrates the dc voltage/current direction of the bidirectional dc converter shown in fig. 1 in the present embodiment, and fig. 6 schematically illustrates the dc power flow path of the bidirectional dc converter shown in fig. 1 in the present embodiment. As shown in fig. 6, a part of the power of the dc source is used to maintain the voltage of the dc capacitors in the first switch module K and the second switch module R stable, and a part of the power is released through the second dc port.DC input current of the bidirectional DC converter in this embodiment
Figure BDA0001952108030000078
Direct current output current
Figure BDA0001952108030000079
Input voltage VinAnd an output voltage VoutRespectively, as shown in the following formula (6):
Figure BDA00019521080300000710
the input current I of the bidirectional dc converter shown in fig. 2 can be obtained based on the above equations (1) to (6)inOutput current IoutAnd an output voltage UoutAre respectively shown in the following formula (7):
Figure BDA0001952108030000081
it should be noted that, when the first dc port and the second dc port are respectively used as the power output port and the power input port, the voltage/current analysis process of the bidirectional dc converter is similar to the above analysis process, and for brevity of description, no further description is given here.
Further, in an alternative implementation of this embodiment, the bidirectional dc converter may include a plurality of first switch modules, a plurality of second switch modules, and a plurality of first capacitors. The bidirectional dc converter will be described with reference to the drawings.
Referring to fig. 7, fig. 7 schematically shows the main structure of the bidirectional dc converter in the present embodiment. As shown in fig. 7, the bidirectional dc converter of this embodiment mainly includes a first dc port (capacitor C in fig. 1)1In parallel with the first DC port), a second DC port (capacitor C in FIG. 1)2In parallel with the second dc port), n first switch modules (K shown in fig. 7)1To Kn) N second switch modules (R shown in FIG. 7)1To Rn) N first capacitors (shown in FIG. 7)Shown as C3To Cn+2) And an inductance module, wherein the inductance module mainly comprises a first inductor L1And a second inductor L2。
Specifically, in the present embodiment, the n first switch modules are connected in series to form a first series branch, and the first switch module in the first series branch (K shown in fig. 7)1) Directly connected to the first dc port, the last first switch module in the first series branch (K in fig. 7)n) And a first inductor L1And (4) direct connection. The n second switch modules are connected in series to form a second series branch, and the first second switch module (R shown in fig. 7) in the second series branch1) Directly connected to the first dc port, the last second switch module (R in fig. 7) in the second series branchn) And a second inductor L2And (4) direct connection. Each first capacitor is respectively connected with a first switch module and a second switch module which are in the same series sequence. For example, the first capacitor C3And a first switch module K1Connected, a first capacitor C3And the other end of the second switch module R1Connecting; a first capacitor C4And a first switch module K2Connected, a first capacitor C4And the other end of the second switch module R2Connecting; a first capacitor Cn+2And a first switch module KnConnected, a first capacitor Cn+2And the other end of the second switch module RnAnd (4) connecting.
Optionally, in this embodiment, each of the first switch module and the second switch module shown in fig. 1 and fig. 7 may include a plurality of series fully-controlled semiconductor switches or power sub-modules, where the power sub-modules may be half-bridge power sub-modules, full-bridge power sub-modules, or MMC sub-modules (Clamp Double sub-modules, CDSM), and the like. The fully-controlled Semiconductor switch may be a Metal-Oxide-Semiconductor Field effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), an Integrated Gate Commutated Thyristor (IGCT), or the like.
Referring to fig. 8 and 9, fig. 8 and 9 show the main structures of a half-bridge power sub-module and a full-bridge power sub-module, respectively. When the first switch module and the second switch module each include a plurality of power sub-modules connected in series, the port voltage U of the first switch module and the second switch modulemmc1And Ummc2Respectively, as shown in the following formula (8):
Figure BDA0001952108030000091
the meaning of each parameter in the formula (8) is:
m is the number of power sub-modules in the first switch module and the second switch module whose operating states are the on states, ucIs the capacitance voltage of the dc capacitor in the power sub-module.
The following describes a control method of a bidirectional dc converter according to the present invention with reference to the accompanying drawings.
Referring to fig. 10, fig. 10 illustrates the main steps of the control method for the bidirectional dc converter shown in fig. 1 or 7 according to the present embodiment. As shown in fig. 10, the method for controlling the bidirectional dc converter in this embodiment mainly includes the following steps:
step S101: and determining the input quantity of the power sub-modules in the first switch module and the second switch module according to a preset direct current conversion requirement.
Specifically, the dc conversion requirement in this embodiment may include a conversion voltage requirement, and the electric energy conversion direction of the bidirectional dc converter and the input number of the power sub-modules in the first switch module and the second switch module may be determined according to the conversion voltage requirement and the voltage value of the power supply. The electric energy conversion direction may be that electric energy is transferred from the first dc port to the second dc port, or that electric energy is transferred from the second dc port to the first dc port.
Step S102: and determining the electric energy conversion direction of the bidirectional direct current converter according to the direct current conversion requirement.
Step S103: and respectively adjusting the working states of the power sub-modules corresponding to the input quantities in the first switch module and the second switch module to be input states according to the electric energy conversion direction.
Supposing that the first switch module and the second switch module respectively comprise 10 series-connected half-bridge power sub-modules, the input number of the power sub-modules in the first switch module and the second switch module is determined to be 5 according to the direct current conversion requirement, the electric energy conversion direction is that electric energy is transferred from the first direct current port to the second direct current port, and then the working states of the 1 st to 5 th half-bridge power sub-modules in the first switch module and the second switch module can be adjusted to be in an input state.
Referring to fig. 11, fig. 11 illustrates the voltage/current direction of the half-bridge power sub-module in this embodiment. As shown in fig. 11, the power electronic device V may be controlled when the power conversion direction is from the first dc port to the second dc port for power transferT1Conducting and controlling power electronics VT2Is turned off to let the current ismSequentially passes through an A end and a diode VD1And a DC capacitor C0Terminal voltage u of half-bridge power submodule flowing to B terminalsm＝ucWherein u iscIs a DC capacitor C0The voltage of (c). The power electronic device V can be controlled when the electric energy conversion direction is the electric energy transfer from the second direct current port to the first direct current portT1Conducting and controlling power electronics VT2Is turned off to let the current ismSequentially passes through a terminal B and a direct current capacitor C0And VT1Terminal voltage u of half-bridge power submodule flowing to A terminalsm＝uc。
Step S104: and adjusting the working states of other power sub-modules to be in a cut-off state according to the electric energy conversion direction. Specifically, as shown in step S103, if the operating states of the 1 st to 5 th half-bridge power sub-modules in the first switch module and the second switch module are adjusted to the on state, the operating states of the remaining 5 half-bridge power sub-modules may be adjusted to the off state.
Continuing to refer to fig. 11, the power electronics V are controlled when the power conversion direction is from the first dc port to the second dc port for power transferT1Turn off and control powerElectronic device VT2Is conducted to make current ismSequentially passes through A terminal and V terminalT2Terminal voltage u of half-bridge power submodule flowing to B terminal sm0. The power electronic device V can be controlled when the electric energy conversion direction is down-converted from the second direct current port to the first direct current portT1Turning off and controlling power electronics VT2Is conducted to make current ismSequentially passes through a B end and a diode VD2Terminal voltage u of half-bridge power submodule flowing to A terminalsm＝0。
Further, in an alternative embodiment of this embodiment, the control method shown in fig. 10 may control the port voltages of the first switch module and the second switch module by using a nearest level approximation modulation method, that is, control the port voltages of the first switch module and the second switch module by using a double closed loop control method of a current inner loop and a voltage outer loop, so that the port voltages of the first switch module and the second switch module can follow the voltage set value.
Further, in another optional implementation of this embodiment, when the bidirectional dc converter is started or the connected dc line fails, the control method shown in fig. 10 may further adjust the operating states of all the first switch modules and all the second switch modules to be the locked state according to the power conversion direction.
Continuing to refer to fig. 11, the power electronics V are controlled when the power conversion direction is from the first dc port to the second dc port for power transferT1And VT2Are all turned off to let current ismSequentially passes through an A end and a diode VD1And a DC capacitor C0Terminal voltage u of half-bridge power submodule flowing to B terminalsm＝uc. The power electronic device V can be controlled when the electric energy conversion direction is the electric energy transfer from the second direct current port to the first direct current portT1And VT2Are all turned off to let current ismSequentially passes through a B end and a diode VD2Terminal voltage u of half-bridge power submodule flowing to A terminalsm＝0。
The following describes simulation results of the bidirectional dc converter shown in fig. 1 in this embodiment with reference to the drawings. In this embodiment, in the bidirectional dc converter shown in fig. 1, each of the first switch module K and the second switch module R includes two half-bridge power sub-modules (shown in fig. 8) connected in series, the power conversion direction is to transfer power from the first dc port to the second dc port, the input voltage of the first dc port is 60V, and the output voltage of the second dc port is 100V.
Referring to fig. 12, fig. 12 exemplarily shows a simulation result of the bidirectional dc converter simulated by the Psim software, where a curve 1 represents a voltage waveform of the first dc port, and a curve 2 represents a voltage waveform of the second dc port, and it can be known from the curves 1 and 2 that the bidirectional dc converter provided by the present invention can accurately boost 60V dc power to 100V dc power.
Although the foregoing embodiments describe the steps in the above sequential order, those skilled in the art will understand that, in order to achieve the effect of the present embodiments, the steps may not be executed in such an order, and may be executed simultaneously (in parallel) or in an inverse order, and these simple variations are within the scope of the present invention.
Those skilled in the art will appreciate that although some embodiments described herein include some features included in other embodiments instead of others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
The present invention may also be embodied as an apparatus or device program (e.g., PC program and PC program product) for carrying out a portion or all of the methods described herein. Such a program implementing the invention may be stored on a PC readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed PC. The use of the words first and second do not denote any order, and these words may be interpreted as names.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (8)

1. A control method of a bidirectional DC converter is characterized in that,
the bidirectional direct current converter comprises a first direct current port, a second direct current port, a first switch module, a second switch module, a first capacitor and an inductance module;
one end of the first switch module is connected with the anode of the first direct current port, the other end of the first switch module is connected with the cathode of the first direct current port through the inductance module, and the cathode of the first direct current port is directly connected with the cathode of the second direct current port;
one end of the second switch module is connected with the anode of the first direct current port, and the other end of the second switch module is connected with the anode of the second direct current port through the inductance module;
one end of the first capacitor is connected with the other end of the first switch module, and the other end of the first capacitor is connected with the other end of the second switch module;
the first switch module and the second switch module respectively comprise a plurality of series-connected fully-controlled semiconductor switches or power sub-modules;
the control method comprises the following steps:
determining the input quantity of power sub-modules in the first switch module and the second switch module according to a preset direct current conversion requirement;
and respectively adjusting the working states of the power sub-modules corresponding to the input quantities in the first switch module and the second switch module to be input states according to the direct current conversion requirements, and adjusting the working states of other power sub-modules to be cut-off states.
2. The method according to claim 1, wherein the step of respectively adjusting the operating states of the power sub-modules corresponding to the input numbers in the first switch module and the second switch module to be input states according to the dc conversion requirement specifically comprises:
determining the electric energy conversion direction of the bidirectional direct current converter according to the direct current conversion requirement;
and respectively adjusting the working states of the power sub-modules corresponding to the input quantities in the first switch module and the second switch module to be input states according to the electric energy conversion direction.
3. The method according to claim 2, wherein the step of adjusting the operating state of the other power sub-modules to the off state specifically comprises:
and adjusting the working state of the power sub-module to be a cut-off state according to the electric energy conversion direction.
4. The method of controlling a bidirectional dc converter according to claim 3, further comprising:
and when the bidirectional direct current converter is started or the accessed direct current line has a fault, adjusting the working states of all the first switch modules and all the second switch modules to be a locking state according to the electric energy conversion direction.
5. The method of controlling a bidirectional dc converter according to claim 3, further comprising:
and controlling the port voltage of the first switch module and the second switch module by adopting a nearest level approximation modulation method.
6. The method of claim 1, wherein the inductance module comprises a first inductor and a second inductor,
the other end of the first switch module is connected with the negative electrode of the first direct current port through the first inductor;
the other end of the second switch module is connected with the positive electrode of the second direct current port through the second inductor.
7. The method of claim 6, wherein the number of the first switch module, the second switch module and the first capacitor is plural,
a plurality of the first switch modules are connected in series to form a first series branch, a first switch module in the first series branch is directly connected with the first direct current port, and a last switch module in the first series branch is directly connected with the first inductor;
a plurality of the second switch modules are connected in series to form a second series branch, a first second switch module in the second series branch is directly connected with the first direct current port, and a last second switch module in the second series branch is directly connected with the second inductor;
each first capacitor is respectively connected with a first switch module and a second switch module which are in the same series sequence.
8. The method of claim 1, 6 or 7, wherein the power sub-module is a half-bridge power sub-module, a full-bridge power sub-module or a clamped dual sub-module.
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