CN109586602B - Auxiliary resonant conversion pole T-type three-level soft switching inverter circuit and modulation method - Google Patents

Auxiliary resonant conversion pole T-type three-level soft switching inverter circuit and modulation method Download PDF

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CN109586602B
CN109586602B CN201811552549.6A CN201811552549A CN109586602B CN 109586602 B CN109586602 B CN 109586602B CN 201811552549 A CN201811552549 A CN 201811552549A CN 109586602 B CN109586602 B CN 109586602B
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auxiliary
switching
tube
switch tube
switching tube
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CN109586602A (en
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张兴
冯之健
王佳宁
荀元武
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Hefei University of Technology
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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
    • H02M7/42—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
    • 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
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention provides an auxiliary resonant conversion pole T-type three-level soft switching inverter circuit and a modulation method thereof. The circuit comprises a T-shaped main inverter circuit, an auxiliary resonance converter circuit, a filter circuit and a load. The T-shaped main inverter circuit comprises four switching tubes with anti-parallel diodes and two same supporting capacitors, and the auxiliary resonant converter circuit comprises two auxiliary switching tubes with anti-parallel diodes, four resonant capacitors and a resonant inductor. The filter circuit is an LC filter circuit. The modulation method provided by the invention can realize zero-voltage switching of the main switching tube and zero-current switching of the auxiliary switching tube. The invention can reduce the loss of the T-shaped three-level hard switch, improve the system efficiency and reduce the electromagnetic interference.

Description

Auxiliary resonant conversion pole T-type three-level soft switching inverter circuit and modulation method
Technical Field
The invention relates to the technical field of power electronics, in particular to an auxiliary resonant conversion pole T-type three-level soft switching inverter circuit and a modulation method.
Background
With the rapid development of power electronics technology, people have increasingly high demands for high-frequency, small-sized, light-weight, high-power and high-power-density inverters. However, as the switching frequency increases, the conventional pwm technique faces many problems, such as increased switching loss of the switching tube and external electromagnetic interference (EMI) generated by the system.
In order to solve the above problems, since the 80 s of the last century, the soft switching technology has been intensively studied, and various topologies and modulation strategies are continuously optimized and improved. The soft switching technology is to utilize the resonance principle to execute the switching action when the voltage or current resonance reaches zero, so as to reduce the voltage and current overlapping area when the switching tube is switched on and off. The soft switching inverter topology is mainly divided into a direct current side type and an alternating current side type, an auxiliary resonance circuit of the direct current side soft switching inverter is connected in series on a direct current bus, and an alternating current side soft switching inverter is divided into a zero voltage conversion type and a zero current conversion type. The zero-voltage conversion type auxiliary resonant transformation extremely-soft switching inverter is applied to high-power occasions with independent control and reliable performance.
Compared with a two-level converter, the multi-level converter has many advantages, and in order to reduce the number of switching tubes and reduce the cost, the T-type three-level converter is widely applied at present, and how to further reduce the switching loss, reduce the electromagnetic interference and improve the power density is a hotspot of research. "zero current switching soft switching technology of T-type neutral point clamped three-level inverter" published in "report of electrotechnical science" 2016 (yao cheng et al) realizes zero current commutation of switching tube by adding auxiliary switching tube and resonant circuit, and reduces the loss of switching tube, but this circuit has the following disadvantages:
1. in order to further improve the switching frequency, silicon carbide and other wide bandgap semiconductor devices are mostly power field effect transistors (MOSFET), and the MOSFET is more suitable for zero-voltage conversion due to large turn-on loss caused by the output capacitance of the MOSFET;
2. the resonant circuit is changed for four times in the current conversion process, so that the loss of the resonant circuit is increased, and the running reliability of the circuit is reduced;
3. the control of the auxiliary switching tube is completed through calculation, so that the difficulty is increased for a control part.
In the novel double-auxiliary resonant pole type three-phase soft switching inverter circuit and the modulation method thereof disclosed in 2018, 9, 21, the invention patent (CN201810448352.1) realizes zero-voltage switching of a switching tube by adding a double-auxiliary resonant inverter circuit, reduces the loss of the switching tube, can reduce system oscillation caused by coupling resonance of the inverter circuit, and has a controllable output voltage change rate, but the circuit has the following defects:
1. the added double-auxiliary resonant converter circuit has more auxiliary switching tubes, auxiliary diodes and the like, so that the hardware cost is increased;
2. the number of auxiliary switching tubes is large, so that the difficulty of a modulation method of the auxiliary switching tubes is increased;
3. the inverter circuit is a two-level circuit, and is difficult to be applied to a three-level circuit.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an auxiliary resonant conversion pole T-type three-level soft switching inverter circuit and a modulation method thereof with high efficiency and simple structure.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
The invention provides an auxiliary resonant conversion pole T-type three-level soft switching inverter circuit, which comprises a T-type main inverter circuit, an auxiliary resonant conversion circuit, a filter circuit and a load R;
the T-shaped main inverter circuit comprises a direct current positive bus P, a direct current negative bus N, a direct current bus midpoint O, four switching tubes with anti-parallel diodes and two same supporting capacitors; four switching tubes with antiparallel diodes are respectively marked as switching tube S1Switch tube S2Switch tube S3And a switching tube S4Four anti-parallel diodes are respectively marked as diode D1Diode D2Diode D3Diode D4The two support capacitors are respectively marked as the support capacitor C1And a support capacitor C2Wherein the DC bus voltage is VdcSupporting capacitor C1Connected between the positive DC bus P and the midpoint O of the DC bus, and supporting a capacitor C2The direct current bus neutral point O is connected with the direct current negative bus N; switch tube S1The input end of the switch tube is connected with a direct current positive bus P and a switch tube S1The output end of the switch tube S4Of the input terminal, switching tube S4The output end of the direct current negative bus is connected with a direct current negative bus N; switch tube S3Is connected with the switch tube S1Of the output terminal, switching tube S3The output end of the switch tube S2Of the output terminal, switching tube S2The input end of the direct current bus is connected with a midpoint O of the direct current bus;
the auxiliary resonance commutation circuit comprises two auxiliary switching tubes with anti-parallel diodes, four resonance capacitors and a resonance inductor LrTwo auxiliary switch tubes with anti-parallel diodes are respectively marked as an auxiliary switch tube Sa1And an auxiliary switching tube Sa2Two antiparallel diodes are respectively denoted as auxiliary diode Da1And an auxiliary diode Da2And four resonance capacitors are respectively marked as resonance capacitor Cr1Resonant capacitor Cr2Resonant capacitor Cr3Resonant capacitor Cr4Wherein an auxiliary switch tube Sa1The output end of the switch is connected with an auxiliary switch tube Sa2Output terminal of (2), auxiliary switch tube Sa2Is connected with the resonant inductor Lr(ii) a Resonant capacitor Cr1Switching tube S of T-shaped main inverter circuit1Parallel resonant capacitor Cr2Switching tube S of T-shaped main inverter circuit2Parallel resonant capacitor Cr3Switching tube S of T-shaped main inverter circuit3Parallel resonant capacitor Cr4Switching tube S of T-shaped main inverter circuit4Parallel connection;
the filter circuit is an LC filter circuit and is formed by connecting a filter inductor L and a filter capacitor C in series, and a resonance inductor LrAuxiliary switch tube Sa2And an auxiliary switching tube Sa1After being sequentially connected in series, the filter capacitor C is connected with a load R in parallel.
The invention also provides a modulation method of the auxiliary resonant transformation pole T-type three-level soft switching inverter circuit, which is characterized in that a switching tube in the auxiliary resonant transformation pole T-type three-level soft switching inverter circuit works in the following mode:
(1) four switching tubes in the T-shaped main inverter circuit work in the following mode:
when switching tube S1Switch tube S2In a conducting state, the switch tube S3Switch tube S4When the bridge arm is in a turn-off state, the bridge arm side outputs a positive level;
when switching tube S2Switch tube S3In a conducting state, the switch tube S1Switch tube S4When the bridge arm is in a turn-off state, the bridge arm side outputs zero level;
when switching tube S3Switch tube S4In a conducting state, the switch tube S1Switch tube S2When the bridge arm is in a turn-off state, the bridge arm side outputs a negative level;
when the output of the bridge arm side is switched between zero level and positive level, the switch tube S1And a switching tube S3Complementary conduction according to sine pulse width modulation, switching tube S1On-time ratio of switching tube S3Is delayed by a dead time td, switch S3On-time ratio of switching tube S1The turn-off time of (c) is delayed by a dead time td;
when the output of the bridge arm side is switched between zero level and negative level, the switch tube S2And a switching tube S4Complementary conduction according to sine pulse width modulation, switching tube S4On-time ratio of switching tube S2Is delayed by a dead time td, switch S2On-time ratio of switching tube S4The turn-off time of (c) is delayed by a dead time td;
(2) the two auxiliary switching tubes in the auxiliary resonant converter circuit work in the following way:
recording the voltage on the filter capacitor C as the voltage V of the filter capacitoroThe current on the filter inductor L is recorded as the filter inductor current IL；
At the filter capacitor voltage VoIs positive, filtering the inductive current ILWhen the output of the positive and bridge arm sides is switched between zero level and positive level, the auxiliary switch tube Sa1On-time ratio of switching tube S3The turn-off time of the auxiliary switch tube S is advanced, the advance time is td1a1Turn-off time ratio of the switching tube S1The switching-on time of (1) is delayed, the delay time is td2, and an auxiliary switch tube Sa2Constant turn-off;
at the filter capacitor voltage VoIs a negative, filtering inductor current ILWhen the output of the negative bridge arm side and the output of the bridge arm side are switched between zero level and negative level, the auxiliary switch tube Sa2On-time ratio of switching tube S2The turn-off time of the auxiliary switch tube S is advanced, the advance time is td1a2Turn-off time ratio of the switching tube S4The switching-on time of (1) is delayed, the delay time is td2, and an auxiliary switch tube Sa1Constant turn-off;
the advance time td1 and the delay time td2 respectively satisfy the following conditions:
Figure BDA0001910993700000041
Figure BDA0001910993700000042
wherein L isrIs the value of the resonant inductance, VdcIs the DC bus voltage ichIs a resonant inductor LrAt the maximum charging current value, which is recorded as charging current ich。
According to the technical scheme, compared with the prior art, the invention has the following advantages:
1. the auxiliary resonant conversion pole T-type three-level soft switching inverter circuit provided by the invention has the advantages of fewer auxiliary switching tubes and auxiliary resonant inductor capacitors, and simple structure.
2. The modulation strategy of the added auxiliary switching tube is simple, and the zero-voltage switching of the main switching tube and the zero-current switching of the auxiliary switching tube are realized.
3. The auxiliary resonant conversion pole T-type three-level soft switching inverter circuit and the modulation method thereof are suitable for medium-high power high-frequency high-voltage inverter circuits, effectively reduce switching loss and reduce electromagnetic interference.
Drawings
Fig. 1 is a diagram of an auxiliary resonant conversion pole T-type three-level soft switching inverter circuit of the present invention.
FIG. 2 shows the voltage V of the filter capacitor of the T-type main inverter circuit and the auxiliary resonant inverter circuit according to the embodiment of the present inventionoIs positive, filtering the inductive current ILAnd when the output voltage is positive, the bridge arm side outputs the driving state of each switching tube, the auxiliary resonant inductive current and the resonant capacitor voltage working waveform when the output voltage is switched between a zero level and a positive level.
FIG. 3 shows the voltage V at the filter capacitoroIs positive, filtering the inductive current ILAnd the output of the bridge arm side is positive, and the commutation stage 1 is schematic when the output of the bridge arm side is switched between a zero level and a positive level.
FIG. 4 shows the voltage V at the filter capacitoroIs positive, filtering the inductive current ILAnd when the output of the bridge arm side is positive, the commutation stage 2 is schematically shown when the output of the bridge arm side is switched between a zero level and a positive level.
FIG. 5 shows the voltage V at the filter capacitoroIs positive, filtering the inductive current ILWhen the output of the bridge arm side is positive, the commutation stage 3 is schematically shown when the output of the bridge arm side is switched between zero level and positive level。
FIG. 6 shows the voltage V at the filter capacitoroIs positive, filtering the inductive current ILAnd the output of the bridge arm side is positive, and the commutation stage 4 is schematic when the output of the bridge arm side is switched between a zero level and a positive level.
FIG. 7 shows the voltage V at the filter capacitoroIs positive, filtering the inductive current ILAnd the output of the bridge arm side is positive, and the commutation stage 5 is schematically shown when the output of the bridge arm side is switched between a zero level and a positive level.
FIG. 8 shows the voltage V at the filter capacitoroIs positive, filtering the inductive current ILAnd the output of the bridge arm side is positive, and the commutation stage 6 is schematically shown when the output of the bridge arm side is switched between a zero level and a positive level.
FIG. 9 shows the voltage V at the filter capacitoroIs positive, filtering the inductive current ILPositive, commutation phase 7 is shown with the bridge leg side output switching between zero and positive levels.
FIG. 10 shows the voltage V at the filter capacitoroIs positive, filtering the inductive current ILAnd the commutation stage 8 is schematic when the output of the bridge arm side is converted between a zero level and a positive level.
FIG. 11 shows the voltage V at the filter capacitoroIs positive, filtering the inductive current ILAnd the output of the bridge arm side is positive, and the commutation stage 9 is schematic when the output of the bridge arm side is switched between a zero level and a positive level.
FIG. 12 shows the voltage V of the filter capacitor of the T-type main inverter circuit and the auxiliary resonant inverter circuit according to the embodiment of the present inventionoIs a negative, filtering inductor current ILAnd when the output voltage of the bridge arm side is negative, the driving state of each switching tube, the auxiliary resonant inductive current and the voltage working waveform of the resonant capacitor are output when the output voltage is converted between a zero level and a negative level.
FIG. 13 shows the voltage V at the filter capacitoroIs a negative, filtering inductor current ILAnd when the output of the bridge arm side is negative, the commutation stage 1 is schematically shown when the output of the bridge arm side is switched between a zero level and a negative level.
FIG. 14 shows the voltage V at the filter capacitoroIs a negative, filtering inductor current ILAnd when the output of the bridge arm side is negative, the commutation stage 2 is schematically shown when the output of the bridge arm side is switched between a zero level and a negative level.
FIG. 15 is a schematic view of a filter capacitorVoltage VoIs a negative, filtering inductor current ILAnd when the output of the bridge arm side is negative, the commutation stage 3 is schematically shown when the output of the bridge arm side is switched between a zero level and a negative level.
FIG. 16 shows the voltage V at the filter capacitoroIs a negative, filtering inductor current ILAnd 4, the schematic diagram of the commutation stage when the output of the bridge arm side is switched between a zero level and a negative level is negative.
FIG. 17 shows the voltage V at the filter capacitoroIs a negative, filtering inductor current ILAnd when the output of the bridge arm side is negative, the commutation stage 5 is schematically shown when the output of the bridge arm side is switched between a zero level and a negative level.
FIG. 18 shows the voltage V at the filter capacitoroIs a negative, filtering inductor current ILAnd when the output of the bridge arm side is negative, the commutation stage 6 is schematically shown when the output of the bridge arm side is switched between a zero level and a negative level.
FIG. 19 shows the voltage V at the filter capacitoroIs a negative, filtering inductor current ILAnd the output of the bridge arm side is negative, and the commutation stage 7 is schematically shown when the output of the bridge arm side is switched between a zero level and a negative level.
FIG. 20 shows the voltage V at the filter capacitoroIs a negative, filtering inductor current ILAnd when the output of the bridge arm side is negative, the commutation stage 8 is schematically shown when the output of the bridge arm side is switched between a zero level and a negative level.
FIG. 21 shows the voltage V at the filter capacitoroIs a negative, filtering inductor current ILAnd when the output of the bridge arm side is negative, the commutation stage 9 is schematically shown when the output of the bridge arm side is switched between a zero level and a negative level.
Detailed Description
In order to make the purpose and technical solution of the present invention more clearly understood, the following detailed description of the embodiments of the present invention is made with reference to the accompanying drawings and examples.
Fig. 1 shows an auxiliary resonant conversion pole T-type three-level soft switching inverter circuit according to the present invention. The figure shows that the auxiliary resonant conversion pole T-type three-level soft switching inverter circuit comprises a T-type main inverter circuit, an auxiliary resonant conversion circuit, a filter circuit and a load R.
The T-shaped main inverter circuit comprises a direct current positive bus P, a direct current negative bus N, a direct current bus midpoint O and four bands in anti-parallel connectionA switch tube of the diode and two same supporting capacitors; four switching tubes with antiparallel diodes are respectively marked as switching tube S1Switch tube S2Switch tube S3And a switching tube S4Four anti-parallel diodes are respectively marked as diode D1Diode D2Diode D3Diode D4The two support capacitors are respectively marked as the support capacitor C1And a support capacitor C2Wherein the DC bus voltage is VdcSupporting capacitor C1Connected between the positive DC bus P and the midpoint O of the DC bus, and supporting a capacitor C2The direct current bus neutral point O is connected with the direct current negative bus N; switch tube S1The input end of the switch tube is connected with a direct current positive bus P and a switch tube S1The output end of the switch tube S4Of the input terminal, switching tube S4The output end of the direct current negative bus is connected with a direct current negative bus N; switch tube S3Is connected with the switch tube S1Of the output terminal, switching tube S3The output end of the switch tube S2Of the output terminal, switching tube S2The input end of the voltage regulator is connected with the midpoint O of the direct current bus.
The auxiliary resonance commutation circuit comprises two auxiliary switching tubes with anti-parallel diodes, four resonance capacitors and a resonance inductor LrTwo auxiliary switch tubes with anti-parallel diodes are respectively marked as an auxiliary switch tube Sa1And an auxiliary switching tube Sa2Two antiparallel diodes are respectively denoted as auxiliary diode Da1And an auxiliary diode Da2And four resonance capacitors are respectively marked as resonance capacitor Cr1Resonant capacitor Cr2Resonant capacitor Cr3Resonant capacitor Cr4Wherein an auxiliary switch tube Sa1The output end of the switch is connected with an auxiliary switch tube Sa2Output terminal of (2), auxiliary switch tube Sa2Is connected with the resonant inductor Lr(ii) a Resonant capacitor Cr1Switching tube S of T-shaped main inverter circuit1Parallel resonant capacitor Cr2Switching tube S of T-shaped main inverter circuit2Parallel resonant capacitor Cr3Switching tube S of T-shaped main inverter circuit3Parallel resonant capacitor Cr4Switching tube S of T-shaped main inverter circuit4And (4) connecting in parallel.
The filter circuit is an LC filter circuit and is formed by connecting a filter inductor L and a filter capacitor C in series, and a resonance inductor LrAuxiliary switch tube Sa2And an auxiliary switching tube Sa1After being sequentially connected in series, the filter capacitor C is connected with a load R in parallel.
The invention also provides a modulation method of the auxiliary resonant transformation pole T-type three-level soft switching inverter circuit, in the method, a switching tube in the auxiliary resonant transformation pole T-type three-level soft switching inverter circuit works in the following mode:
(1) four switching tubes in the T-shaped main inverter circuit work in the following mode:
when switching tube S1Switch tube S2In a conducting state, the switch tube S3Switch tube S4When the bridge arm is in a turn-off state, the bridge arm side outputs a positive level;
when switching tube S2Switch tube S3In a conducting state, the switch tube S1Switch tube S4When the bridge arm is in a turn-off state, the bridge arm side outputs zero level;
when switching tube S3Switch tube S4In a conducting state, the switch tube S1Switch tube S2When the bridge arm is in a turn-off state, the bridge arm side outputs a negative level;
when the output of the bridge arm side is switched between zero level and positive level, the switch tube S1And a switching tube S3Complementary conduction according to sine pulse width modulation, switching tube S1On-time ratio of switching tube S3Is delayed by a dead time td, switch S3On-time ratio of switching tube S1The turn-off time of (c) is delayed by a dead time td;
when the output of the bridge arm side is switched between zero level and negative level, the switch tube S2And a switching tube S4Complementary conduction according to sine pulse width modulation, switching tube S4On-time ratio of switching tube S2Is delayed by a dead time td, switch S2On-time ratio of switching tube S4Off time delay ofA dead time td.
(2) The two auxiliary switching tubes in the auxiliary resonant converter circuit work in the following way:
recording the voltage on the filter capacitor C as the voltage V of the filter capacitoroThe current on the filter inductor L is recorded as the filter inductor current IL；
At the filter capacitor voltage VoIs positive, filtering the inductive current ILWhen the output of the positive and bridge arm sides is switched between zero level and positive level, the auxiliary switch tube Sa1On-time ratio of switching tube S3The turn-off time of the auxiliary switch tube S is advanced, the advance time is td1a1Turn-off time ratio of the switching tube S1The switching-on time of (1) is delayed, the delay time is td2, and an auxiliary switch tube Sa2Constant turn-off;
at the filter capacitor voltage VoIs a negative, filtering inductor current ILWhen the output of the negative bridge arm side and the output of the bridge arm side are switched between zero level and negative level, the auxiliary switch tube Sa2On-time ratio of switching tube S2The turn-off time of the auxiliary switch tube S is advanced, the advance time is td1a2Turn-off time ratio of the switching tube S4The switching-on time of (1) is delayed, the delay time is td2, and an auxiliary switch tube Sa1And is constantly turned off.
The advance time td1 and the delay time td2 respectively satisfy the following conditions:
Figure BDA0001910993700000081
Figure BDA0001910993700000082
wherein L isrIs the value of the resonant inductance, VdcIs the DC bus voltage ichIs a resonant inductor LrAt the maximum charging current value, which is recorded as charging current ich。
Because one pulse width modulation period is very small compared with the output phase voltage period of the inverter, the output of the inverter can be considered as a current source when an inductive load and a power grid are connectedCharacteristically, for analytical convenience, the filter inductor current I is considered to be the filter inductor current during a switching cycleLConstant, filter capacitor voltage VoConstant and unchanged. By filtering the capacitor voltage VoThe upper positive and the lower negative are defined as positive to filter the inductive current ILThe in-filter inductance is defined as positive. Under different load conditions, the following three conditions occur for a short time: voltage V of filter capacitoroAnd the filter inductor current ILWhen having different polarities; voltage V of filter capacitoroIs positive, filtering the inductive current ILWhen the output of the bridge arm side is positive, the output of the bridge arm side is converted between zero level and negative level; voltage V of filter capacitoroIs a negative, filtering inductor current ILAnd the output of the bridge arm side is negative, and is converted between a zero level and a positive level. In these three cases, it is necessary to change the auxiliary switching tube Sa1Auxiliary switch tube Sa2To avoid this complexity and because of the short time that exists in these three cases, the auxiliary resonant commutation circuit is inactive for this short time.
The working principle and modulation method of the circuit topology of the present invention will be described below for two cases.
(1) Voltage V of filter capacitoroIs positive, filtering the inductive current ILPositive, the leg side output transitions between a zero level and a positive level.
The driving state of the switching tube, the resonant inductor current and the resonant capacitor voltage operating waveforms in the T-type main inverter circuit and the auxiliary resonant inverter circuit are shown in fig. 2. One switching cycle comprises nine commutation stages, which are respectively:
stage 1[ t 0-t 1]: as shown in fig. 3, the switch tube S at this stage2Switch tube S3In a conducting state, the switch tube S1Switch tube S4Auxiliary switch tube Sa1Auxiliary switch tube Sa2In the off state, filtering the inductor current ILFlows through the switch tube S2And a switching tube S3Providing energy to a load R.
Stage 2[ t 1-t 2]: as shown in fig. 4, the auxiliary switch tube S is turned on at time t1a1Filtration ofWave capacitor voltage VoAdded to the resonant inductor LrTwo ends, charged by an inductor, are allowed to flow through LrAuxiliary inductor current iLrLinearly increasing, auxiliary inductor current iLrSwitch tube S flowing through auxiliary tubea1And an auxiliary diode Da2。
Stage 3[ t 2-t 3]: as shown in fig. 5, the auxiliary inductor current iLrIs continuously charged to a charging current ich，ichGreater than the filter inductance current ILPart of the current of the switch tube S2And a switching tube S3And flows through.
Stage 4[ t 3-t 4]: as shown in fig. 6, the switching tube S is turned off at time t33Resonant capacitor Cr3Upper voltage uCr3From zero to DC bus voltage VdcOne half of (1), resonant capacitor Cr1Voltage u ofCr1From the DC bus voltage VdcIs reduced to zero, and the current flows through the resonant capacitor Cr1And a resonance capacitor Cr3Due to the switching tube S3Resonance capacitor C after switch-offr3Charging, switching tube S3The voltage of the switch will not rise immediately, and zero voltage turn-off is realized.
Stage 5[ t 4-t 5]: as shown in fig. 7, the resonant capacitor Cr1Upper voltage uCr1Resonant to zero, diode D1Naturally conducting, switching tube S1The upper voltage is zero, and the switching tube S is turned on at the stage1Realize the switch tube S1Zero voltage conduction, resonant inductance LrUpper auxiliary inductor current iLrLinearly down to the filter inductor current IL。
Stage 6[ t 5-t 6]: as shown in fig. 8, the auxiliary inductor current iLrLinear discharge to zero, switching tube S1Current at is linearly increased to the filter inductor current ILResonant inductor current iLrAfter the voltage drops to zero, the auxiliary switch tube Sa1The upper current is zero, and the auxiliary switch tube S is turned off after the time t6a1And zero current turn-off is realized.
Stage 7[ t 6-t 7]: as shown in fig. 9, the switching tube S1Switch tube S2In a conducting state, the switch tube S3Switch, and electronic device using the samePipe S4Auxiliary switch tube Sa1Auxiliary switch tube Sa2In the off state, filtering the inductor current ILFlows through the switch tube S1And providing energy for the load to reach a steady state stage.
Stage 8[ t 7-t 8]: as shown in fig. 10, the switching tube S is turned off at time t71Resonant capacitor Cr1Voltage uCr1From zero to DC bus voltage VdcOne half of (1), resonant capacitor Cr3Voltage u ofCr3From the DC bus voltage VdcOne half of (S) drops to zero due to the switching tube S1Resonance capacitor C after switch-offr1Charging, switching tube S1The voltage of the switch will not rise immediately, and zero voltage turn-off is realized.
Stage 9[ t 8-t 0]: as shown in FIG. 11, the resonant capacitor Cr3Upper voltage uCr3After dropping to zero, the diode D3Naturally conducting, switching tube S3The upper voltage is zero, and the switching tube S is turned on at the stage3Realize the switch tube S3Zero voltage conduction, filtering of the inductor current ILFlows through the switch tube S2And a diode D3Energy is provided for the load R, the commutation process is finished, and the loop returns to the initial stage 1 before commutation.
(2) Voltage V of filter capacitoroIs a negative, filtering inductor current ILNegative, the bridge arm side output transitions between a zero level and a negative level.
Voltage V of filter capacitoroAnd the filter inductor current ILThe filter capacitor voltage in this case will be indicated below as-V, contrary to the positive direction of definitionoThe filter inductor current is represented as-IL。
The driving state of the switching tube, the resonant inductor current and the resonant capacitor voltage in the T-type main inverter circuit and the auxiliary resonant inverter circuit are shown in fig. 12. Nine commutation stages are still included in one switching cycle, and the nine commutation stages are respectively:
stage 1[ t 0-t 1]: as shown in fig. 13, the switch tube S at this stage2Switch tube S3In a conducting state, the switch tube S1Switch tube S4Auxiliary materialsAuxiliary switch tube Sa1Auxiliary switch tube Sa2In the off state, filtering the inductor current-ILFlows through the switch tube S2And a switching tube S3Providing energy to a load R.
Stage 2[ t 1-t 2]: as shown in fig. 14, the auxiliary switch tube S is turned on at time t1a2Filter capacitor voltage-VoAdded to the resonant inductor LrTwo ends, charged by an inductor, are allowed to flow through LrAuxiliary inductor current iLrLinearly increasing, auxiliary inductor current iLrSwitch tube S flowing through auxiliary tubea2And an auxiliary diode Da1。
Stage 3[ t 2-t 3]: as shown in fig. 15, the auxiliary inductor current iLrIs continuously charged to a charging current ich，ichGreater than the filter inductance current ILPart of the current of the switch tube S2And a switching tube S3And flows through.
Stage 4[ t 3-t 4]: as shown in fig. 16, the switching tube S is turned off at time t32Resonant capacitor Cr2Upper voltage uCr2From zero to DC bus voltage VdcOne half of (1), resonant capacitor Cr4Voltage u ofCr4From the DC bus voltage VdcIs reduced to zero, and the current flows through the resonant capacitor Cr2And a resonance capacitor Cr4Due to the switching tube S2Resonance capacitor C after switch-offr2Charging, switching tube S2The voltage of the switch will not rise immediately, and zero voltage turn-off is realized.
Stage 5[ t 4-t 5]: as shown in FIG. 17, the resonant capacitor Cr4Upper voltage uCr4Resonant to zero, diode D4Naturally conducting, switching tube S4The upper voltage is zero, and the switching tube S is turned on at the stage4Realize the switch tube S4Zero voltage conduction, resonant inductance LrUpper auxiliary inductor current iLrLinearly down to the filter inductor current IL。
Stage 6[ t 5-t 6]: as shown in fig. 18, the auxiliary inductor current iLrLinear discharge to zero, switching tube S4Current at is linearly increased to the filter inductor current ILResonant inductor currentiLrAfter the voltage drops to zero, the auxiliary switch tube Sa2The upper current is zero, and the auxiliary switch tube S is turned off after the time t6a2And zero current turn-off is realized.
Stage 7[ t 6-t 7]: as shown in fig. 19, the switching tube S3Switch tube S4In a conducting state, the switch tube S1Switch tube S2Auxiliary switch tube Sa1Auxiliary switch tube Sa2In the off state, filtering the inductor current-ILFlows through the switch tube S4And providing energy for the load to reach a steady state stage.
Stage 8[ t 7-t 8]: as shown in FIG. 20, the switch tube S is turned off at time t74Resonant capacitor Cr4Voltage uCr4From zero to DC bus voltage VdcOne half of (1), resonant capacitor Cr2Voltage u ofCr2From the DC bus voltage VdcOne half of (S) drops to zero due to the switching tube S4Resonance capacitor C after switch-offr4Charging, switching tube S4The voltage on the switch will not rise immediately, and zero voltage turn-off is realized.
Stage 9[ t 8-t 0]: as shown in FIG. 21, resonant capacitor Cr2After the upper voltage drops to zero, the diode D2Naturally conducting, switching tube S2The upper voltage is zero, and the switching tube S is turned on at the stage2Realize the switch tube S2Zero voltage conduction, filtering of the inductor current-ILFlow-through diode D2And a switching tube S3Energy is provided for the load R, the commutation process is finished, and the loop returns to the initial stage 1 before commutation.

Claims (2)

1. The utility model provides an auxiliary resonance conversion utmost point T type three level soft switch inverter circuit which characterized in that: the three-phase inverter comprises a T-shaped main inverter circuit, an auxiliary resonant converter circuit, a filter circuit and a load R;
the T-shaped main inverter circuit comprises a direct current positive bus P, a direct current negative bus N, a direct current bus midpoint O, four switching tubes with anti-parallel diodes and two same supporting capacitors; four switching tubes with antiparallel diodes are respectively marked as switching tube S1Switch tube S2Switch tube S3And a switching tube S4Four anti-parallel diodes are respectively marked as diode D1Diode D2Diode D3Diode D4The two support capacitors are respectively marked as the support capacitor C1And a support capacitor C2Wherein the DC bus voltage is VdcSupporting capacitor C1Connected between the positive DC bus P and the midpoint O of the DC bus, and supporting a capacitor C2The direct current bus neutral point O is connected with the direct current negative bus N; switch tube S1The input end of the switch tube is connected with a direct current positive bus P and a switch tube S1The output end of the switch tube S4Of the input terminal, switching tube S4The output end of the direct current negative bus is connected with a direct current negative bus N; switch tube S3Is connected with the switch tube S1Of the output terminal, switching tube S3The output end of the switch tube S2Of the output terminal, switching tube S2The input end of the direct current bus is connected with a midpoint O of the direct current bus;
the auxiliary resonance commutation circuit comprises two auxiliary switching tubes with anti-parallel diodes, four resonance capacitors and a resonance inductor LrTwo auxiliary switch tubes with anti-parallel diodes are respectively marked as an auxiliary switch tube Sa1And an auxiliary switching tube Sa2Two antiparallel diodes are respectively denoted as auxiliary diode Da1And an auxiliary diode Da2And four resonance capacitors are respectively marked as resonance capacitor Cr1Resonant capacitor Cr2Resonant capacitor Cr3Resonant capacitor Cr4Wherein an auxiliary switch tube Sa1The output end of the switch is connected with an auxiliary switch tube Sa2Output terminal of (2), auxiliary switch tube Sa2Is connected with the resonant inductor LrOf the output terminal of the resonant inductor LrThe input end of the T-shaped main inverter circuit is connected with a switching tube S1An output terminal of (a); resonant capacitor Cr1Switching tube S of T-shaped main inverter circuit1Parallel resonant capacitor Cr2Switching tube S of T-shaped main inverter circuit2Parallel resonant capacitor Cr3Switching tube S of T-shaped main inverter circuit3Parallel resonant capacitor Cr4Switching tube S of T-shaped main inverter circuit4Parallel connection;
the filteringThe circuit is an LC filter circuit and is formed by connecting a filter inductor L and a filter capacitor C in series, wherein the input end of the filter inductor L is connected with a switching tube S of the T-shaped main inverter circuit1The output end of the filter inductor L is connected with the input end of the filter capacitor C, and the output end of the filter capacitor C is connected with the midpoint O of the direct current bus;
resonance inductance L of auxiliary resonance commutation circuitrAuxiliary switch tube Sa2And an auxiliary switching tube Sa1Sequentially connected in series and then connected in parallel with a filter inductor L in an LC filter circuit, wherein the resonance inductor LrIs connected with the input end of the filter inductor L and the auxiliary switch tube Sa1The input end of the filter capacitor C is connected with the output end of the filter inductor L, and the filter capacitor C is connected with the load R in parallel.
2. The modulation method of the auxiliary resonant transformation pole T-type three-level soft switching inverter circuit as claimed in claim 1, wherein the switching tube of the auxiliary resonant transformation pole T-type three-level soft switching inverter circuit works in the following way:
(1) four switching tubes in the T-shaped main inverter circuit work in the following mode:
when switching tube S1Switch tube S2In a conducting state, the switch tube S3Switch tube S4When the bridge arm is in a turn-off state, the bridge arm side outputs a positive level;
when switching tube S2Switch tube S3In a conducting state, the switch tube S1Switch tube S4When the bridge arm is in a turn-off state, the bridge arm side outputs zero level;
when switching tube S3Switch tube S4In a conducting state, the switch tube S1Switch tube S2When the bridge arm is in a turn-off state, the bridge arm side outputs a negative level;
when the output of the bridge arm side is switched between zero level and positive level, the switch tube S1And a switching tube S3Complementary conduction according to sine pulse width modulation, switching tube S1On-time ratio of switching tube S3Is delayed by a dead time td, switch S3On-time ratio of switching tube S1Off moment ofDelaying a dead time td;
when the output of the bridge arm side is switched between zero level and negative level, the switch tube S2And a switching tube S4Complementary conduction according to sine pulse width modulation, switching tube S4On-time ratio of switching tube S2Is delayed by a dead time td, switch S2On-time ratio of switching tube S4The turn-off time of (c) is delayed by a dead time td;
(2) the two auxiliary switching tubes in the auxiliary resonant converter circuit work in the following way:
recording the voltage on the filter capacitor C as the voltage V of the filter capacitoroThe current on the filter inductor L is recorded as the filter inductor current IL；
At the filter capacitor voltage VoIs positive, filtering the inductive current ILWhen the output of the positive and bridge arm sides is switched between zero level and positive level, the auxiliary switch tube Sa1On-time ratio of switching tube S3The turn-off time of the auxiliary switch tube S is advanced, the advance time is td1a1Turn-off time ratio of the switching tube S1The switching-on time of (1) is delayed, the delay time is td2, and an auxiliary switch tube Sa2Constant turn-off;
at the filter capacitor voltage VoIs a negative, filtering inductor current ILWhen the output of the negative bridge arm side and the output of the bridge arm side are switched between zero level and negative level, the auxiliary switch tube Sa2On-time ratio of switching tube S2The turn-off time of the auxiliary switch tube S is advanced, the advance time is td1a2Turn-off time ratio of the switching tube S4The switching-on time of (1) is delayed, the delay time is td2, and an auxiliary switch tube Sa1Constant turn-off;
the advance time td1 and the delay time td2 respectively satisfy the following conditions:
Figure FDA0002286803080000031
Figure FDA0002286803080000032
wherein L isrIs the value of the resonant inductance, VdcIs the DC bus voltage ichIs a resonant inductor LrAt the maximum charging current value, which is recorded as charging current ich。
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CN103997043A (en) * 2014-05-15 2014-08-20 南京工程学院 Uniform electricity quality regulator based on T-type three-level inverter and regulating method thereof
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