CN114665727B - Three-single phase compatible MISN converter - Google Patents

Three-single phase compatible MISN converter Download PDF

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Publication number
CN114665727B
CN114665727B CN202210567456.0A CN202210567456A CN114665727B CN 114665727 B CN114665727 B CN 114665727B CN 202210567456 A CN202210567456 A CN 202210567456A CN 114665727 B CN114665727 B CN 114665727B
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phase
misn
converter
voltage
power supply
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CN114665727A (en
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吴新科
赵问鼎
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ZJU Hangzhou Global Scientific and Technological Innovation Center
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ZJU Hangzhou Global Scientific and Technological Innovation Center
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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal 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
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal 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 in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention relates to a three-single phase compatible MISN converter, which is characterized in that: three-phase AC power supply
Figure 801843DEST_PATH_IMAGE001
Connected with three-phase filter inductor L and MISN module, and the three-phase AC power supply
Figure 870162DEST_PATH_IMAGE001
Switches S are respectively arranged between the three-phase filter inductor L and the three-phase filter inductor L a 、S b 、S c The middle point O and the three-phase AC power supply
Figure 694899DEST_PATH_IMAGE001
Connecting switch S o And is finally connected to switch S 1 、S 2 、S 3 、S 4 、S 5 、S 6 The middle point of the formed rectifier bridge; the circuit adopts a three-phase four-wire connection method during three-phase operation, and a three-phase neutral point is connected with the midpoint of a direct-current output bus
Figure 529344DEST_PATH_IMAGE002
. The invention also relates to a method for calculating the steady-state voltage of the diode rectification type three-single phase compatible MISN converter; and a three-single phase compatible MISN converter with controllable switches. The MISN converter is based on a three-phase two-level six-switch (2L 6B) topology, MISN multi-level modules are connected in series on an alternating-current side inductor, and the MISN converter can effectively reduceThe small inductance and the size of the filter further improve the power density of the three-phase compatible PFC converter.

Description

Three-single phase compatible MISN converter
Technical Field
The invention belongs to the field of charging converter structures, and particularly relates to a three-single-phase compatible MISN (modular Inductive Switching network) converter.
Background
In recent years, with the rapid development of the new energy automobile industry, the endurance mileage of a pure electric vehicle (BEV) is increasing, and the charging power of the automobile is also increasing gradually. The electric automobile has two modes of direct current quick charging and alternating current slow charging, the direct current quick charging directly charges the battery through public charging pile equipment, and the direct current quick charging is not convenient enough due to incomplete infrastructure construction at present; the battery is charged through an on-board charger (OBC) through the alternating current slow charging, the electric automobile is directly connected with a power grid, and the alternating current charging pile is low in cost and flexible in construction and is a main charging mode of the electric automobile at the present stage. In the initial development stage of the electric automobile, the battery capacity of the electric automobile is small, and the power of the OBC is about 3.3 kW; nowadays, the battery capacity of the electric automobile is increased by several times, and the power of a vehicle-mounted charger is also improved to more than 6.6 kW. To further increase the ac charging power, OBCs are moving towards three-phase/single-phase compatibility, which may increase the power to 11kW or 22 kW.
At present, a front-stage PFC converter of a three/single-phase compatible vehicle-mounted charger mainly has two schemes, namely a modular scheme and an integrated scheme. The modular solution is based on the existing single-phase converters which are assembled into converters that can be operated in connection with a three-phase or single-phase network, using relays or other kinds of controllable switching light. The method has the main advantages that the development cost is low, and the additional technology development cost is not required to be increased; in contrast, modular solutions have a low utilization of circuit components and a low power density. Therefore, the industry starts to provide an integrated scheme, and a three-phase/single-phase compatible converter constructed based on a classic two-level three-phase six-bridge (3 phase 6bridge, 2L 6B) arm topology is compounded in a three-phase or single-phase operation circuit, so that the component utilization rate is improved. The disadvantage of the two-level scheme is that the ac side inductance is large volt-seconds, which makes the inductance and differential mode filter part bulky, limiting the power density of the converter.
Disclosure of Invention
In view of the above, the present invention has been developed to provide a solution that overcomes, or at least partially solves, the above-mentioned problems. Accordingly, in one aspect of the present invention, there is provided aThree single-phase compatible MISN converters characterized by: three-phase AC power supply
Figure 102943DEST_PATH_IMAGE001
Connected with three-phase filter inductor L and MISN module, and the three-phase AC power supply
Figure 65083DEST_PATH_IMAGE001
Switches S are respectively arranged between the three-phase filter inductor L and the three-phase filter inductor L a 、S b 、S c The middle point O and the three-phase AC power supply
Figure 552565DEST_PATH_IMAGE001
Connecting switch S o And is finally connected to switch S 1 、S 2 、S 3 、S 4 、S 5 、S 6 The middle point of the formed rectifier bridge; the circuit adopts three-phase four-wire system connection method when three-phase operation, and the three-phase neutral point is connected with the midpoint O of the direct current output bus.
Preferably, the switch S is selected a 、S b 、S c 、S o When all the converter are closed, the converter forms a three-phase compatible MISN converter; and gate the switch S a 、S b 、S c Any one of (1) and S o When closed, the converter forms a single phase compatible MISN converter.
The invention also provides a diode-rectifying compatible MISN converter, which is characterized in that: three-phase AC power supply
Figure 916550DEST_PATH_IMAGE001
The three-phase filter inductor L and the MISN module are connected with each other and are finally connected to the middle point of a rectifier bridge formed by diodes; the circuit adopts three-phase four-wire system connection method when three-phase operation, and the three-phase neutral point is connected with the midpoint O of the direct current output bus.
Preferably, an AC power supply
Figure 73862DEST_PATH_IMAGE002
The filter inductor L and the MISN module are connected with the middle point of a bridge arm of the rectifier bridge; alternating currentSource
Figure 523298DEST_PATH_IMAGE003
The filter inductor L and the MISN module are connected with the middle point of a bridge arm of the rectifier bridge; AC power supply
Figure 689837DEST_PATH_IMAGE004
The filter inductor L and the MISN module are connected with the middle point of a bridge arm of the rectifier bridge.
Preferably, in the equivalent circuit a, the diode mode of the MISN converter is: when the power frequency is in the positive half period, the A-phase rectifier bridge feeds the tube S 1 Conducting, bridge arm midpoint voltage
Figure 645679DEST_PATH_IMAGE005
(ii) a And in the negative half period, the lower tube S of the A-phase rectifier bridge 2 Conducting, bridge arm midpoint voltage
Figure 239472DEST_PATH_IMAGE006
Therefore, it is possible to
Figure 910625DEST_PATH_IMAGE007
Is a square wave voltage and Vo is the output voltage.
Preferably, the phase of the voltage current of the B-phase equivalent circuit is different from the phase of the voltage current of the A-phase equivalent circuit by 120 degrees; the phase of the voltage current of the C-equivalent circuit is different from the phase of the voltage current of the B-equivalent circuit by 120 degrees.
The invention also provides a steady-state voltage calculation method based on the diode rectification type compatible MISN converter, which is characterized by comprising the following steps:
Figure 146434DEST_PATH_IMAGE007
fundamental wave voltage of
Figure 219432DEST_PATH_IMAGE008
And an input voltage
Figure 249705DEST_PATH_IMAGE002
Equal, i.e.:
Figure 267208DEST_PATH_IMAGE009
wherein the content of the first and second substances,
Figure 772620DEST_PATH_IMAGE010
is angular frequency time, U A Is the effective value of the input voltage;
Figure 700125DEST_PATH_IMAGE007
fundamental wave voltage of
Figure 901299DEST_PATH_IMAGE008
The expression is as follows:
Figure 281465DEST_PATH_IMAGE011
the expression for the output voltage Vo can thus be found as:
Figure 593498DEST_PATH_IMAGE012
the invention also provides a three-single-phase compatible MISN converter with controllable switch, which replaces the diode in the diode rectification type three-single-phase compatible MISN converter with the controllable switch, and is characterized by comprising the following steps: three-phase AC power supply
Figure 375509DEST_PATH_IMAGE001
The three-phase bridge arm consists of a switch, a three-phase filter inductor L, MISN module, a controllable switch and a direct current output;
wherein, the three-phase AC power supply
Figure 606639DEST_PATH_IMAGE001
Each of which is connected to a switch, each switch being connected to a respective identical filter inductance L, which filter inductances L are each connected to a respective MISN module；
Three-phase AC power supply
Figure 880626DEST_PATH_IMAGE001
Each corresponding MISN module is respectively connected with the middle points a, b and c of the controllable switches in the three-phase bridge arm, and the three-phase alternating current power supply
Figure 999279DEST_PATH_IMAGE001
Are connected to the midpoint O of the dc output bus.
Preferably, the MISN converter has two control variables, namely the duty cycle of the MISN module and the duty cycle of the rectifier bridge.
The invention also provides a steady-state voltage calculation method of the three-single-phase compatible MISN converter based on the controllable switch, which is characterized by comprising the following steps: the drive scheme of phase angle chopping modulation is adopted, and the chopping angle is increased by the midpoint voltage of the rectifier bridge
Figure 760430DEST_PATH_IMAGE013
Fundamental wave voltage thereof
Figure 303407DEST_PATH_IMAGE008
Becomes:
Figure 658165DEST_PATH_IMAGE014
at the moment according to the input voltage in steady state
Figure 577579DEST_PATH_IMAGE002
Equal to the fundamental component, the expression of the output voltage Vo added with the phase angle chopper modulation can be deduced:
Figure 334183DEST_PATH_IMAGE015
the output voltage Vo being subjected to a chopping angle
Figure 48061DEST_PATH_IMAGE013
Influence of, angle of chopping
Figure 152765DEST_PATH_IMAGE013
The larger the output voltage Vo at the steady state.
The technical scheme provided in the embodiment of the application at least has the following technical effects or advantages: on the basis of a 2L6B topology, the MISN converter is connected with the MISN multi-level module in series on the inductor at the alternating current side, so that the size of the inductor and the filter can be effectively reduced, and the power density of the integrated three-single-phase compatible PFC converter is further improved.
The above description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood, and to make the above description and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a circuit structure diagram of three single-phase compatible MISN converters;
FIG. 2 is a circuit configuration diagram of a three-phase compatible MISN converter;
FIG. 3 is a circuit diagram of a single phase compatible MISN converter;
FIG. 4 is a diagram of a plurality of cascaded H-bridge cells in a MISN module;
FIG. 5 is a circuit configuration diagram of a diode-commutated three-phase compatible MISN converter;
fig. 6 is a circuit configuration diagram of a diode-rectified single-phase compatible MISN converter circuit taking phase a conduction as an example;
FIG. 7 is a schematic circuit diagram of the diode mode of the MISN converter;
FIG. 8 is a schematic diagram of a MISN module charge-discharge balancing circuit of a diode rectification type MISN converter in a steady state;
FIG. 9 is a block diagram of a three-phase compatible MISN converter circuit for the controllable switches;
FIG. 10 is a block diagram of a single phase compatible MISN converter circuit for the controllable switch;
FIG. 11 is a graph of a controllable switch based rectifier bridge midpoint voltage waveform;
FIG. 12 is a schematic diagram of the operation of a circuit incorporating rectifier bridge phase angle chopper modulation;
fig. 13 is a schematic diagram of a charge-discharge balancing circuit of a MISN module of the controllable switch type MISN converter in a steady state;
FIG. 14 is a graph of converter voltage gain versus chopping angle.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The invention provides a three-single phase compatible MISN converter, as shown in figure 1, a three-phase alternating current power supply
Figure 610291DEST_PATH_IMAGE001
Connected with three-phase filter inductor L and MISN module, and three-phase AC power supply
Figure 221401DEST_PATH_IMAGE001
Switches S are respectively arranged between the three-phase filter inductor L and the three-phase filter inductor L a 、S b 、S c The middle point O and the three-phase AC power supply
Figure 371759DEST_PATH_IMAGE001
Connecting switch S o And is finally connected to switch S 1 、S 2 、S 3 、S 4 、S 5 、S 6 The middle point of the formed rectifier bridge; the circuit adopts three-phase four-wire system connection method when three-phase operation, and the three-phase neutral point is connected with the midpoint O of the direct current output bus.
Wherein the switch S 1 、S 2 、S 3 、S 4 、S 5 、S 6 Comprises a controllable switch or an uncontrollable switch, wherein the controllable switch comprises an IGBT, a MOSFET and the like; the uncontrolled switch comprises a diode.
When the switch S is turned on a 、S b 、S c 、S o When fully closed, the converter forms a three-phase compatible MISN converter, as shown in fig. 2; and gate the switch S a 、S b 、S c Any one of (1) and S o When closed, the converter forms a single phase compatible MISN converter as shown in fig. 3.
As shown in FIG. 4, the MISN module is composed of a plurality of cascaded cells, each having a capacitance voltage of
Figure 497847DEST_PATH_IMAGE004
. The MISN module topology of the present invention may use a cascade H-bridge (CHB) structure as shown in fig. 4 (a), or may use a Flying Capacitor (FC) structure as shown in fig. 4 (b).
The present invention provides a diode-rectified three-single phase compatible MISN converter, as shown in FIG. 5, wherein the controllable switch S in the three-single phase compatible MISN converter 1 、S 2 、S 3 、S 4 、S 5 、S 6 And replacing the rectifier diode to form a new converter circuit structure. The method comprises the following specific steps: three-phase AC power supply
Figure 493485DEST_PATH_IMAGE001
The three-phase filter inductor L and the MISN module are connected with each other and are finally connected to the middle point of a rectifier bridge formed by diodes; the circuit adopts three-phase four-wire system connection method when three-phase operation, and the three-phase neutral point is connected with the midpoint O of the direct current output bus.
The voltages of the middle point and the neutral point of the three-phase diode rectifier bridge are respectively
Figure 693522DEST_PATH_IMAGE016
Switch S when selected a 、S b 、S c 、S o When the converter is fully closed, the converter forms a diode rectification type three-phase compatible MISN converter; and gate the switch S a 、S b 、S c Any one of (1) and S o Closing is carried outThe converter then forms a diode-rectified single-phase compatible MISN converter, as shown in fig. 6, with phase a conducting.
In the single-phase operation mode, the a-phase equivalent circuit is as shown in fig. 7 (a), and the circuit principle of the diode rectification type MISN converter is analyzed based on this. As shown in fig. 7 (b) - (e), the voltage and current waveforms of the a-phase equivalent circuit are shown in the steady state of the circuit. From top to bottom are input voltages
Figure 17712DEST_PATH_IMAGE002
Input current of
Figure 834358DEST_PATH_IMAGE017
Mid-point voltage of diode rectifier bridge
Figure 492741DEST_PATH_IMAGE007
And MISN output voltage
Figure 812864DEST_PATH_IMAGE018
. Assuming that the converter can achieve power factor correction, the input current
Figure 305025DEST_PATH_IMAGE017
Tracking input voltage of
Figure 77809DEST_PATH_IMAGE002
. Therefore, the direction of the current can be judged, and the tube S is arranged on the A-phase rectifier bridge in the positive half period of the power frequency 1 On, the midpoint voltage of the bridge arm
Figure 415250DEST_PATH_IMAGE005
(ii) a And in the negative half period, the lower tube S of the A-phase rectifier bridge 2 Conducting, bridge arm midpoint voltage
Figure 118108DEST_PATH_IMAGE006
Therefore, it is possible to
Figure 374646DEST_PATH_IMAGE007
Is a square wave voltage, V o Is the output voltage.To reduce the voltage across the inductor L, the converter uses MISN modules to carry the input voltage
Figure 165884DEST_PATH_IMAGE002
And
Figure 307016DEST_PATH_IMAGE007
e.g. in (d) of FIG. 7
Figure 867310DEST_PATH_IMAGE019
The MISN module port voltage is shown as a multi-level voltage, and the black bold line is
Figure 170115DEST_PATH_IMAGE019
Approximately satisfies the average value of the switching period of
Figure 448650DEST_PATH_IMAGE020
. At this time, the inductor voltage
Figure 130823DEST_PATH_IMAGE021
The voltage amplitude is small. Therefore, the MISN converter effectively reduces the voltage second of the inductor, and is beneficial to reducing the volume of the inductor.
Since the three-phase operation mode adopts a three-phase four-wire connection method, the analysis result can be analogized to the three-phase operation mode.
The phase difference between the voltage and the current in the A-phase equivalent circuit is 120 degrees.
The C equivalent circuit working principle and waveform are the same as those of the A equivalent circuit, wherein the phase of the voltage and the current in the B equivalent circuit are different by 120 degrees.
In the three-phase operating mode, the output voltage of the MISN converter can be calculated from the MISN module energy balance.
As shown in fig. 8, in steady state, the charge and discharge of the MISN module are balanced, and the input power is transmitted to the load by the rectifier bridge, therefore
Figure 545623DEST_PATH_IMAGE007
Fundamental wave voltage of
Figure 550489DEST_PATH_IMAGE008
And an input voltage
Figure 785161DEST_PATH_IMAGE002
Equal, i.e.:
Figure 268095DEST_PATH_IMAGE022
wherein, the first and the second end of the pipe are connected with each other,
Figure 802981DEST_PATH_IMAGE010
is angular frequency time, U A Is the effective value of the input voltage.
Figure 713169DEST_PATH_IMAGE007
The fundamental voltage expression of (d) is:
Figure 580278DEST_PATH_IMAGE011
the expression for the output voltage can thus be found as:
Figure 601324DEST_PATH_IMAGE012
the fundamental voltage and output voltage of the B-phase circuit are calculated using the same calculation formula and method as the a-phase circuit described above.
The fundamental voltage and the output voltage of the C-phase circuit are calculated using the same calculation formula and method as those of the a-phase circuit described above.
It can be seen from the above formula that the midpoint voltage is due to
Figure 725138DEST_PATH_IMAGE007
Fundamental component of
Figure 71806DEST_PATH_IMAGE008
And an output voltage V o Since the ratio is constant, the output voltage of the diode-rectified MISN converter is uncontrollable and varies with the input voltage.
In order to control the output voltage, a control degree of freedom is added to control the midpoint voltage
Figure 546649DEST_PATH_IMAGE007
Fundamental component of
Figure 105807DEST_PATH_IMAGE008
And an output voltage V o The ratio relation of the output voltage and the input voltage can be controlled, and the output voltage regulation is further realized. To achieve this, the present invention also provides a three-single phase compatible MISN converter based on controllable switches, as shown in fig. 9, and the rectifier diodes in the diode-rectified three-single phase compatible MISN converter are modified into controllable switches, such as MOSFETs, IGBTs, etc. At this time, the MISN converter has two control variables, namely the duty ratio of the MISN module and the duty ratio of the rectifier bridge.
As shown in fig. 9, the converter specifically includes: three-phase AC power supply
Figure 208761DEST_PATH_IMAGE001
The three-phase bridge arm consists of a switch, a three-phase filter inductor L, MISN module, a controllable switch and a direct current output. Wherein, the three-phase AC power supply
Figure 729259DEST_PATH_IMAGE001
Each connected to a respective filter inductor L connected to the MISN module, and finally, a three-phase ac power supply
Figure 691399DEST_PATH_IMAGE001
Each corresponding MISN module is respectively connected with the middle points a, b and c of the controllable switches in the three-phase bridge arm. In addition, three-phase alternating currentPower supply
Figure 319827DEST_PATH_IMAGE001
Are connected to the midpoint O of the dc output bus.
When the switch S is turned on a 、S b 、S c 、S o When all closed, the converter forms a three-phase compatible MISN converter based on controllable switches, as shown in FIG. 10; and gate the switch S a 、S b 、S c Any one of (1) and S o After closing, the converter forms a single-phase compatible MISN converter based on controllable switches, as shown in fig. 10, for the case of a-phase conduction.
In order to reduce circuit loss, the MOSEFT frequency of the rectifier bridge is not too high, and the rectifier bridge is in a low-frequency switching state. The rectifier bridge adopts a phase angle chopping modulation method, the midpoint voltage waveform of a bridge arm is shown in figure 11, and symmetrical chopping angles are added on the basis of square wave voltage
Figure 152653DEST_PATH_IMAGE013
The modulation method reduces the switching frequency of the rectifier bridge to the limit, not only keeps the control capability of the midpoint voltage of the rectifier bridge, but also ensures that the rectifier bridge works at the lowest switching frequency.
In single-phase operation, the A-phase equivalent circuit diagram is shown in (a) of FIG. 12, and the input voltage is shown in (b) of FIG. 12
Figure 841124DEST_PATH_IMAGE002
And a midpoint voltage of the rectifier bridge
Figure 290560DEST_PATH_IMAGE007
The waveform of (a); to reduce volt-seconds on the ac side inductance, a MISN module is used to take up the input voltage
Figure 457099DEST_PATH_IMAGE002
And the midpoint voltage of the rectifier bridge
Figure 675590DEST_PATH_IMAGE007
The waveform of the difference of (b) is as shown in (c) in FIG. 12It is shown as a multilevel waveform, the black bold line is the average of its switching cycles, and its value approximately satisfies:
Figure 532032DEST_PATH_IMAGE023
(ii) a The inductor voltage is shown in (d) of fig. 12, and thus it can be seen that the MISN module can still effectively reduce the voltage across the inductor by adding a new driving scheme to the rectifier bridge.
Since the three-phase operation mode adopts a three-phase four-wire connection method, the analysis result can be analogized to the three-phase operation mode. At this time, the equivalent circuit diagram B, C and the equivalent circuit diagram a have the same structure and operation waveforms.
The invention adopts a phase angle chopping modulation driving scheme, the midpoint voltage of the rectifier bridge is shown in figure 13, and compared with figure 8, the midpoint voltage of the rectifier bridge increases a chopping angle
Figure 203185DEST_PATH_IMAGE013
Fundamental wave voltage thereof
Figure 438994DEST_PATH_IMAGE008
Becomes:
Figure 246413DEST_PATH_IMAGE014
at this time, according to the fact that the input voltage is equal to the fundamental component in a steady state, an output voltage expression after phase angle chopping modulation is added can be deduced:
Figure 276686DEST_PATH_IMAGE015
thus, the output voltage V o Is subject to a chopping angle
Figure 435135DEST_PATH_IMAGE013
The influence of (c). The chopping angle is plotted in FIG. 14
Figure 677898DEST_PATH_IMAGE013
And voltage gain
Figure 870982DEST_PATH_IMAGE024
In a transformation relation of where U s Is an input voltage effective value; chopping angle
Figure 75086DEST_PATH_IMAGE013
The larger the steady state voltage gain M, the larger the output voltage can be controlled by adjusting the chopping angle.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
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, any reference signs placed between parentheses shall not be construed as limiting the claim.

Claims (10)

1. A three-single phase compatible MISN converter, characterized by:three-phase AC power supply
Figure 76016DEST_PATH_IMAGE001
Connected with three-phase filter inductor L and MISN module, and the three-phase AC power supply
Figure 321052DEST_PATH_IMAGE001
Wherein, switches Sa and S are respectively arranged between one end of the three-phase filter inductor L b Sc, a midpoint O and the three-phase alternating current power supply
Figure 959844DEST_PATH_IMAGE001
Another end of the three-phase AC power supply is connected with a switch So
Figure 678356DEST_PATH_IMAGE001
After being connected with a three-phase filter inductor L and a MISN converter, the three-phase filter inductor L and the MISN converter are finally connected with a switch S 1 、S 2 、S 3 、S 4 、S 5 、S 6 The middle points of the three rectifier bridges; the circuit adopts three-phase four-wire connection method when three-phase operation is performed, and the three-phase neutral point is connected with the midpoint of the DC output bus
Figure DEST_PATH_IMAGE002
。
2. The converter of claim 1, wherein:
when the gate switch S a 、S b 、S c 、S o When all the converter are closed, the converter forms a three-phase compatible MISN converter; and gate the switch S a 、S b 、S c Any one of (1) and S o When closed, the converter forms a single phase compatible MISN converter.
3. A diode rectification type three-single phase compatible MISN converter is characterized in that: three-phase AC power supply
Figure 882942DEST_PATH_IMAGE001
Connected with three-phase filter inductor L and MISN module, and three-phase AC power supply
Figure 564459DEST_PATH_IMAGE001
Wherein, switches Sa and S are respectively arranged between one end of the three-phase filter inductor L b Sc, a midpoint O and the three-phase alternating current power supply
Figure 97071DEST_PATH_IMAGE001
Another end of the three-phase AC power supply is connected with a switch So
Figure 623868DEST_PATH_IMAGE001
The three-phase filter inductor L and the MISN converter are connected, and are finally connected to the middle points of three rectifier bridges formed by diodes; the circuit adopts three-phase four-wire connection method when three-phase operation is performed, and the three-phase neutral point is connected with the midpoint of the DC output bus
Figure 558325DEST_PATH_IMAGE002
。
4. The transducer of claim 3, wherein: AC power supply
Figure 614006DEST_PATH_IMAGE003
The filter inductor L and the MISN module are connected with the middle point of a bridge arm of the rectifier bridge; AC power supply
Figure 430652DEST_PATH_IMAGE004
The filter inductor L and the MISN module are connected with the middle point of a bridge arm of the rectifier bridge; AC power supply
Figure 495560DEST_PATH_IMAGE005
The filter inductor L and the MISN module are connected with the middle point of a bridge arm of the rectifier bridge.
5. A transducer as claimed in claim 3, characterized in thatIn the following steps: in the A phase equivalent circuit, the diode mode of the MISN converter is as follows: when the power frequency is in the positive half period, the A-phase rectifier bridge feeds the tube S 1 Conducting, bridge arm midpoint voltage
Figure 81263DEST_PATH_IMAGE006
(ii) a And in the negative half period, the lower tube S of the A-phase rectifier bridge 2 On, the midpoint voltage of the bridge arm
Figure DEST_PATH_IMAGE007
Therefore, it is
Figure 307845DEST_PATH_IMAGE008
Is a square wave voltage and Vo is the output voltage.
6. The converter of claim 5, wherein: the phase of the voltage current of the equivalent circuit B is different from the phase of the voltage current of the equivalent circuit A by 120 degrees; the phase of the voltage current of the C-equivalent circuit is different from the phase of the voltage current of the B-equivalent circuit by 120 degrees.
7. A steady-state voltage calculation method based on the diode-rectified three-single-phase compatible MISN converter of any one of claims 3 to 6, characterized in that:
Figure 877366DEST_PATH_IMAGE008
fundamental wave voltage of
Figure DEST_PATH_IMAGE009
And an input voltage
Figure 949227DEST_PATH_IMAGE003
Equal, i.e.:
Figure 920594DEST_PATH_IMAGE010
wherein the content of the first and second substances,
Figure DEST_PATH_IMAGE011
is angular frequency time, U A Is the effective value of the input voltage;
Figure 318078DEST_PATH_IMAGE008
fundamental wave voltage of
Figure 312578DEST_PATH_IMAGE009
The expression is as follows:
Figure 922551DEST_PATH_IMAGE012
the expression for the output voltage Vo thus obtained is:
Figure DEST_PATH_IMAGE013
。
8. a three-single phase compatible MISN converter with controllable switching, which replaces the diodes in the converter according to any of claims 3-6 with controllable switches, characterized in that it comprises: three-phase AC power supply
Figure 279583DEST_PATH_IMAGE001
The three-phase bridge arm consists of a switch, a three-phase filter inductor L, MISN module, a controllable switch and a direct current output;
wherein, the three-phase AC power supply
Figure 316810DEST_PATH_IMAGE001
Each of which is connected to a switch, each of which is connected to a respective identical filter inductor L, each filter inductor L being connected to a respective MISN module;
three-phase AC power supply
Figure 798606DEST_PATH_IMAGE001
Each corresponding MISN module is respectively connected with the middle points a, b and c of the controllable switches in the three-phase bridge arm, and the three-phase alternating current power supply
Figure 9008DEST_PATH_IMAGE001
Are connected to the midpoint of the DC output bus
Figure 892650DEST_PATH_IMAGE002
。
9. The transducer of claim 8, wherein: the MISN converter has two control variables, namely the duty cycle of the MISN module and the duty cycle of the rectifier bridge.
10. A steady-state voltage calculation method for a three-single-phase compatible MISN converter according to claim 8, characterized in that: the drive method of phase angle chopping modulation is adopted, and the chopping angle is increased by the midpoint voltage of the rectifier bridge
Figure 100778DEST_PATH_IMAGE014
Fundamental voltage thereof
Figure 69871DEST_PATH_IMAGE009
Becomes:
Figure DEST_PATH_IMAGE015
at the moment according to the input voltage in steady state
Figure 349542DEST_PATH_IMAGE003
Equal to fundamental component, deducing output voltage V after adding phase angle chopper modulation 0 Expression:
Figure 87691DEST_PATH_IMAGE016
output voltage V 0 Is subject to a chopping angle
Figure 732299DEST_PATH_IMAGE014
Influence of, angle of chopping
Figure 188688DEST_PATH_IMAGE014
The larger the output voltage V at steady state 0 The larger.
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