CN110768562A - Topological structure of single-phase inverter, modulation method and device, and storage medium - Google Patents

Topological structure of single-phase inverter, modulation method and device, and storage medium Download PDF

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Publication number
CN110768562A
CN110768562A CN201911075786.2A CN201911075786A CN110768562A CN 110768562 A CN110768562 A CN 110768562A CN 201911075786 A CN201911075786 A CN 201911075786A CN 110768562 A CN110768562 A CN 110768562A
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China
Prior art keywords
switching device
modulation signal
controllable switch
switch tube
phase inverter
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CN110768562B (en
Inventor
史尤杰
杨煜
许树楷
李岩
郑耀东
雷博
陈俊
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CSG Electric Power Research Institute
China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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China Southern Power Grid Co Ltd
Research Institute of Southern Power Grid Co Ltd
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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
    • H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • 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
    • 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

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

Abstract

The invention discloses a modulation method of a single-phase inverter, wherein when the single-phase inverter works under a preset first period, a first switching device and a second switching device are modulated according to an SPWM method, and fundamental wave frequency modulation is carried out on a third switching device and a fourth switching device; when the single-phase inverter works in a preset second period, fundamental wave frequency modulation is carried out on the first switching device and the second switching device, and the third switching device and the fourth switching device are modulated according to an SPWM method. The embodiment of the invention also discloses a topological structure of the single-phase inverter, and the loss of the switching device is effectively reduced by adopting a plurality of embodiments.

Description

Topological structure of single-phase inverter, modulation method and device, and storage medium
Technical Field
The invention relates to the technical field of inverters, in particular to a topological structure of a single-phase inverter, a modulation method, a modulation device and a storage medium.
Background
In the prior art, for a single-phase inverter with a power level of tens of kW, the switching frequency under the SPWM modulation mode is generally designed to be about 20kHz, and when the single-phase inverter is modulated, the operating frequency of each switching device is very high, and the loss of the switching device is very large, thereby reducing the operating efficiency of the power system.
Disclosure of Invention
The embodiment of the invention provides a topological structure of a single-phase inverter, a modulation method, a modulation device and a storage medium, which can effectively reduce the loss of a switching device.
An embodiment of the present invention provides a topology structure of a single-phase inverter, including: the direct-current bus capacitor comprises a direct-current voltage input end, a direct-current filter inductor, a direct-current bus capacitor, an alternating-current filter inductor, four same switching devices and an alternating-current voltage output end; wherein the first switching devices each include: first controllable switch tube and first diode, the second switching device all includes: second controllable switch tube and second diode, third switching device all includes: third controllable switch tube and third diode, fourth switching device all includes: a fourth controllable switch tube and a fourth diode;
the collector of the first controllable switch tube is connected with the cathode of the first diode, and the emitter of the first controllable switch tube is connected with the anode of the first diode; the collector of the second controllable switch tube is connected with the cathode of the second diode, and the emitter of the second controllable switch tube is connected with the anode of the second diode; the collector of the third controllable switch tube is connected with the cathode of the third diode, and the emitter of the third controllable switch tube is connected with the anode of the third diode; a collector of the fourth controllable switching tube is connected with a cathode of the fourth diode, and an emitter of the fourth controllable switching tube is connected with an anode of the fourth diode; the emitter of the second controllable switch tube is connected with the emitter of the fourth controllable switch tube, and the collector of the first controllable switch tube is connected with the collector of the third controllable switch tube;
a positive pin of the direct-current voltage input end is connected to a midpoint between an emitter of the first controllable switch tube and a collector of the second controllable switch tube through the direct-current filter inductor, and a negative pin of the direct-current voltage input end is connected to the emitter of the second controllable switch tube;
the first end of the direct current bus capacitor is connected with the collector of the first controllable switch tube, and the second end of the direct current bus capacitor is connected with the emitter of the second controllable switch tube;
the alternating voltage first output end is connected with a midpoint between an emitter of the third controllable switch tube and a collector of the fourth controllable switch tube through the alternating filter inductor, and the alternating voltage second output end is connected with a midpoint between the emitter of the first controllable switch tube and the collector of the second controllable switch tube.
Another embodiment of the present invention correspondingly provides a modulation method for a single-phase inverter, which is applied to a topology structure of the single-phase inverter, and includes:
when the single-phase inverter works in a preset first period, modulating the first switching device and the second switching device according to an SPWM method, wherein the first switching device adopts a first modulation signal, and the second switching device adopts a second modulation signal; wherein the second modulation signal is 1-the first modulation signal;
performing fundamental frequency modulation on the third switching device and the fourth switching device, wherein a third modulation signal adopted by the third switching device is 1, the third switching device is always in a closed state, and a fourth modulation signal adopted by the fourth switching device is 0, the fourth switching device is always in an open state; wherein the fourth modulation signal is 1 — the third modulation signal;
the preset first period is ω t ∈ ((2k-2) pi, (2k-1) pi ], k ═ 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
As an improvement of the above, the method further comprises:
when the single-phase inverter works in a preset second period, fundamental wave frequency modulation is performed on the first switching device and the second switching device, a fifth modulation signal adopted by the first switching device is 1, the first switching device is always in a closed state, and a sixth modulation signal adopted by the second switching device is 0, the second switching device is always in an open state; wherein the sixth modulation signal is 1-the fifth modulation signal;
modulating the third switching device and the fourth switching device according to an SPWM method, wherein the third switching device adopts a seventh modulation signal, and the fourth switching device adopts an eighth modulation signal; wherein the eighth modulation signal is 1 — the seventh modulation signal;
the preset second period is ω t ∈ ((2k-1) pi, 2k pi), k is 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
As an improvement of the above scheme, the first modulation signal is D1＝Uin/[Uin+Uabsin(ωt)](ii) a Wherein, UinIs the voltage at the DC voltage input, Uabsin (ω t) is the voltage difference between a first midpoint voltage between the emitter of the third controllable switch and the collector of the fourth controllable switch and a midpoint voltage between the emitter of the first controllable switch and the collector of the second controllable switch.
As an improvement of the above, the seventh modulation signal is D7＝1+Uabsin(ωt)/Uin(ii) a Wherein, UinVoltage at the DC voltage input, Uabsin (ω t) is the voltage difference between the second midpoint voltage between the emitter of the third controllable switch and the collector of the fourth controllable switch and the midpoint voltage between the emitter of the first controllable switch and the collector of the second controllable switch.
Another embodiment of the present invention correspondingly provides a modulation apparatus for a single-phase inverter, including:
the first control module is used for modulating the first switching device and the second switching device according to an SPWM method when the single-phase inverter works in a preset first period, wherein the first switching device adopts a first modulation signal, and the second switching device adopts a second modulation signal; wherein the second modulation signal is 1-the first modulation signal;
the second control module is used for performing fundamental frequency modulation on the third switching device and the fourth switching device, if a third modulation signal adopted by the third switching device is 1, the third switching device is always in a closed state, and if a fourth modulation signal adopted by the fourth switching device is 0, the fourth switching device is always in an open state; wherein the fourth modulation signal is 1 — the third modulation signal;
the preset first period is ω t ∈ ((2k-2) pi, (2k-1) pi ], k ═ 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
As an improvement of the above, the apparatus further comprises:
the third control module is configured to perform fundamental frequency modulation on the first switching device and the second switching device when the single-phase inverter operates in a preset second period, where a fifth modulation signal used by the first switching device is 1, the first switching device is always in a closed state, and a sixth modulation signal used by the second switching device is 0, the second switching device is always in an open state; wherein the sixth modulation signal is 1-the fifth modulation signal;
the fourth control module is used for modulating the third switching device and the fourth switching device according to an SPWM method, wherein the third switching device adopts a seventh modulation signal, and the fourth switching device adopts an eighth modulation signal; wherein the eighth modulation signal is 1 — the seventh modulation signal;
the preset second period is ω t ∈ ((2k-1) pi, 2k pi), k is 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
Another embodiment of the present invention correspondingly provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus in which the computer-readable storage medium is located is controlled to execute the modulation method for the single-phase inverter.
Compared with the prior art, the embodiment of the invention discloses a topological structure, a modulation method, a modulation device and a storage medium of a single-phase inverter, wherein when the single-phase inverter works under a preset first period, the first switching device and the second switching device are modulated according to an SPWM method, and fundamental wave frequency modulation is carried out on the third switching device and the fourth switching device; when the single-phase inverter works in a preset second period, fundamental wave frequency modulation is carried out on the first switching device and the second switching device, and the third switching device and the fourth switching device are modulated according to an SPWM method. Through the two modulation methods, the first switching device, the second switching device, the third switching device and the fourth switching device of the single-phase inverter respectively perform SPWM modulation in half of the time and perform fundamental frequency modulation in half of the time in one fundamental frequency period (for example, [0,2 π ]). Therefore, the action frequency of the switching device is reduced, the loss of the switching device is effectively reduced, the efficiency of the power system is improved, and the heat dissipation design is enhanced.
Drawings
Fig. 1 is a schematic structural diagram of a topology of a single-phase inverter according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a modulation method of a single-phase inverter according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a single-phase inverter according to an embodiment of the present invention, in which a controllable switching tube performs SPWM modulation according to a modulation method;
fig. 4 is a schematic diagram of main waveforms of a modulation method of a single-phase inverter according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a modulation method of a single-phase inverter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a topology structure of a single-phase inverter according to an embodiment of the present invention.
The embodiment of the invention provides a topological structure of a single-phase inverter, which comprises: DC voltage input end and DC filter inductor LinDC bus capacitor CbusAC filter inductor LoFour identical switching devices and an alternating voltage output end; wherein the first switching devices S1 each include: the first controllable switch tube and the first diode, the second switch device S2 includes: a second controllable switch tube, a second diode, and a third switching device S3 each including: a third controllable switch tube, a third diode, and a fourth switching device S4 each including: a fourth controllable switch tube and a fourth diode. In this embodiment, the controllable switch is an Insulated Gate Bipolar Transistor (IGBT).
The collector of the first controllable switch tube is connected with the cathode of the first diode, and the emitter of the first controllable switch tube is connected with the anode of the first diode; the collector of the second controllable switch tube is connected with the cathode of the second diode, and the emitter of the second controllable switch tube is connected with the anode of the second diode; the collector of the third controllable switch tube is connected with the cathode of the third diode, and the emitter of the third controllable switch tube is connected with the anode of the third diode; a collector of the fourth controllable switching tube is connected with a cathode of the fourth diode, and an emitter of the fourth controllable switching tube is connected with an anode of the fourth diode; and the emitter of the second controllable switch tube is connected with the emitter of the fourth controllable switch tube, and the collector of the first controllable switch tube is connected with the collector of the third controllable switch tube.
The positive pin of the DC voltage input end passes through the DC filter inductor LinAnd the negative pin of the direct current voltage input end is connected with the emitter of the second controllable switch tube.
The DC bus capacitor CbusIs connected with the collector of the first controllable switch tube, and the DC bus capacitor CbusIs connected with the emitter of the second controllable switching tube.
The first output end of the alternating voltage and the alternating current filter inductor LoThe second output end of the alternating voltage is connected to the midpoint between the emitter of the first controllable switch tube and the collector of the second controllable switch tube.
Specifically, the first switching device S1 and the second switching device S2 form a DC/DC bridge arm that can perform boost conversion of a DC input, UbThe bridge arm midpoint voltage is the midpoint voltage between the emitter of the first controllable switch tube and the collector of the second controllable switch tube (namely, the DC/DC bridge arm midpoint voltage). The third switching device S3 and the fourth switching device S4 form a DC/AC bridge arm, and the bridge arm realizes direct-to-alternating conversion under the coordination of the DC/DC bridge arm, and UaThe bridge arm midpoint voltage is the midpoint voltage between the emitter of the third controllable switch tube and the collector of the fourth controllable switch tube (namely, the DC/AC bridge arm midpoint voltage). U shapeabIs the difference between the midpoint voltages of the two bridge armsUab＝Ua-UbI.e. the output voltage at the ac voltage output.
Fig. 2 is a schematic flow chart of a modulation method of a single-phase inverter according to an embodiment of the present invention.
Another embodiment of the present invention correspondingly provides a modulation method for a single-phase inverter, which is applied to a topology structure of the single-phase inverter, and includes:
s10, when the single-phase inverter operates in a preset first period, modulating the first switching device and the second switching device according to an SPWM method, where the first switching device uses a first modulation signal, and the second switching device uses a second modulation signal; wherein the second modulation signal is 1-the first modulation signal.
In this embodiment, referring to fig. 3, SPWM modulation is performed on the DC/DC bridge arm, and the first modulation signal is D1＝Uin/[Uin+Uabsin(ωt)](ii) a Wherein D is1The waveform is shown in the 0-pi stage of FIG. 4 (a); u shapeinIs the voltage at the DC voltage input, Uabsin (ω t) corresponds to an output voltage command at the ac voltage output terminal. The second modulation signal is D2＝1-D1。
And due to the inductance LinHas a negligible voltage drop, so that the midpoint voltage U between the emitter of the first controllable switch tube and the collector of the second controllable switch tubebAbout the voltage U of the DC voltage input terminalin(ii) a Wherein, UbThe waveform is shown in the 0. about. pi. phase of FIG. 4 (e).
Therefore, the DC bus capacitor CbusHas a first voltage of UC＝Uin/D1＝Uin+Uabsin (ω t); wherein, UCThe waveform is shown in the 0. about. pi. stage, D, of FIG. 4(c)1For said first modulated signal, UinIs the voltage at the DC voltage input, Uabsin (ω t) corresponds to an output voltage command at the ac voltage output terminal.
S20, performing fundamental frequency modulation on the third switching device and the fourth switching device, where a third modulation signal adopted by the third switching device is 1, the third switching device is always in a closed state, and a fourth modulation signal adopted by the fourth switching device is 0, the fourth switching device is always in an open state; wherein the fourth modulation signal is 1 — the third modulation signal;
the preset first period is ω t ∈ ((2k-2) pi, (2k-1) pi ], k ═ 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
In particular, referring to fig. 4, the fundamental frequency modulation is performed for the DC/AC leg. The third modulation signal is D 31, i.e. the third switching device S3 is inactive and is always in a closed state, where D3The waveform is shown in the 0-pi stage of FIG. 4 (b); the fourth modulation signal is D4＝1-D3When the voltage is equal to 0, the fourth switching device S4 is not operated and is always in the off state.
In this embodiment, the fundamental frequency modulation is performed by a DC/AC bridge arm, and the DC/AC bridge arm midpoint voltage (i.e. the first midpoint voltage between the emitter of the third controllable switch tube and the collector of the fourth controllable switch tube) is Ua＝UC·D3＝Uin+Uabsin (ω t); wherein, UaThe waveform is shown in the 0. about. pi. phase of FIG. 4 (d).
The first output voltage of the alternating current voltage output end is a first midpoint voltage U between an emitter of the third controllable switch tube and a collector of the fourth controllable switch tubeaAnd a midpoint voltage U between the emitter of the first controllable switch tube and the collector of the second controllable switch tubebIf the voltage difference is greater than the first output voltage of the AC voltage output terminal, the first output voltage of the AC voltage output terminal is Uab＝Ua-Ub＝Uabsin (ω t), so that the voltage at the ac voltage output always follows its voltage command in the first predetermined period, UabThe waveform is shown in the 0. about. pi. phase of FIG. 4 (f).
As an improvement of the above solution, the method further comprises:
s30, when the single-phase inverter operates in a preset second period, performing fundamental frequency modulation on the first switching device and the second switching device, where a fifth modulation signal used by the first switching device is 1, the first switching device is always in a closed state, and a sixth modulation signal used by the second switching device is 0, the second switching device is always in an open state; wherein the sixth modulation signal is 1-the fifth modulation signal.
Specifically, fundamental frequency modulation is performed for the DC/DC bridge arm. The fifth modulation signal is D 51, namely the first switching device S1 does not act and is always in a closed state; the sixth modulation signal is D6＝1-D 50, that is, the second switching device S2 does not act and is always in the off state; wherein D is5The waveform is shown in the pi-2 pi stage of FIG. 4 (a). And due to the inductance LinHas a negligible voltage drop, so that the midpoint voltage U between the emitter of the first controllable switch tube and the collector of the second controllable switch tubebAbout the voltage U of the DC voltage input terminalin(ii) a Wherein, UbThe waveform is shown in the pi-2 pi phase of FIG. 4 (e).
In this embodiment, the fundamental frequency modulation is performed by a DC/DC bridge arm, and the DC bus capacitor CbusIs U 'of the second voltage'C＝Uin/D5＝Uin(ii) a Wherein, U'CThe waveform is shown in the pi-2 pi stage, D, of FIG. 4(c)5For the fifth modulation signal, UinIs the voltage at the dc voltage input.
S40, modulating the third switching device and the fourth switching device according to an SPWM method, wherein the seventh modulation signal is adopted by the third switching device, and the eighth modulation signal is adopted by the fourth switching device; wherein the eighth modulation signal is 1 — the seventh modulation signal; the preset second period is ω t ∈ ((2k-1) pi, 2k pi), k is 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
Concretely, SPWM method adjustment is carried out on a DC/AC bridge armAnd (5) preparing. The seventh modulation signal is D7＝1+Uabsin(ωt)/Uin(ii) a Wherein D is7The waveform is shown in the pi-2 pi stage, U, of FIG. 4(b)inIs the voltage at the DC voltage input, Uabsin (ω t) is an output voltage command at the ac voltage output. The eighth modulation signal is D8＝1-D7。
In this embodiment, the SPWM modulation is performed on the DC/AC bridge arm, and the second midpoint voltage between the emitter of the third controllable switching tube and the collector of the fourth controllable switching tube (i.e., the DC/AC bridge arm midpoint voltage) is U'a＝U’C·D7＝Uin+Uabsin (ω t); wherein, U'aThe waveform is shown in the pi-2 pi phase of FIG. 4 (d). And the second output voltage of the alternating current voltage output end is a second midpoint voltage U 'between the emitter of the third controllable switch tube and the collector of the fourth controllable switch tube'aAnd a midpoint voltage U between the emitter of the first controllable switch tube and the collector of the second controllable switch tubebIs U 'of the second output voltage of the AC voltage output terminal'ab＝U’a-Ub＝Uabsin (ω t), so that the voltage at the ac voltage output always follows its voltage command during the preset second period; wherein, UabThe waveform is shown in the pi-2 pi phase of FIG. 4 (f).
In summary, when the single-phase inverter operates in a preset first cycle, the first switching device S1 and the second switching device S2 are modulated according to the SPWM method, and the third switching device S3 and the fourth switching device S4 are fundamental frequency modulated; when the single-phase inverter operates in a preset second period, the first switching device S1 and the second switching device S2 are subjected to fundamental wave frequency modulation, and the third switching device S3 and the fourth switching device S4 are modulated according to the SPWM method. Through the above two modulation methods, the single-phase inverter performs SPWM modulation and fundamental frequency modulation half the time in one fundamental frequency cycle (e.g., [0,2 pi ]) for half the time of the first switching device S1, the second switching device S2, the third switching device S3 and the fourth switching device S4, respectively. Therefore, the action frequency of the switching device is reduced, the loss of the switching device is effectively reduced, the efficiency of the power system is improved, and the heat dissipation design is enhanced.
Fig. 5 is a schematic structural diagram of a modulation method of a single-phase inverter according to an embodiment of the present invention.
The embodiment of the invention correspondingly provides a modulation device of a single-phase inverter, which comprises:
the first control module 10 is configured to modulate the first switching device and the second switching device according to an SPWM method when the single-phase inverter operates in a preset first period, where the first switching device uses a first modulation signal and the second switching device uses a second modulation signal; wherein the second modulation signal is 1-the first modulation signal;
the second control module 20 is configured to perform fundamental frequency modulation on the third switching device and the fourth switching device, where a third modulation signal used by the third switching device is 1, the third switching device is always in a closed state, and a fourth modulation signal used by the fourth switching device is 0, the fourth switching device is always in an open state; wherein the fourth modulation signal is 1 — the third modulation signal;
the preset first period is ω t ∈ ((2k-2) pi, (2k-1) pi ], k ═ 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
As an improvement of the above, the apparatus further comprises:
the third control module is configured to perform fundamental frequency modulation on the first switching device and the second switching device when the single-phase inverter operates in a preset second period, where a fifth modulation signal used by the first switching device is 1, the first switching device is always in a closed state, and a sixth modulation signal used by the second switching device is 0, the second switching device is always in an open state; wherein the sixth modulation signal is 1-the fifth modulation signal;
the fourth control module is used for modulating the third switching device and the fourth switching device according to an SPWM method, wherein the third switching device adopts a seventh modulation signal, and the fourth switching device adopts an eighth modulation signal; wherein the eighth modulation signal is 1 — the seventh modulation signal;
the preset second period is ω t ∈ ((2k-1) pi, 2k pi), k is 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
In summary, when the single-phase inverter operates in a preset first cycle, the first switching device S1 and the second switching device S2 are modulated according to the SPWM method, and the third switching device S3 and the fourth switching device S4 are fundamental frequency modulated; when the single-phase inverter operates in a preset second period, the first switching device S1 and the second switching device S2 are subjected to fundamental wave frequency modulation, and the third switching device S3 and the fourth switching device S4 are modulated according to the SPWM method. Through the above two modulation methods, the single-phase inverter performs SPWM modulation and fundamental frequency modulation half the time in one fundamental frequency cycle (e.g., [0,2 pi ]) for half the time of the first switching device S1, the second switching device S2, the third switching device S3 and the fourth switching device S4, respectively. Therefore, the action frequency of the switching device is reduced, the loss of the switching device is effectively reduced, the efficiency of the power system is improved, and the heat dissipation design is enhanced.
The embodiment of the invention correspondingly provides a computer-readable storage medium, which comprises a stored computer program, wherein when the computer program runs, a device where the computer-readable storage medium is located is controlled to execute the modulation method of the single-phase inverter.
The memory may be used to store the computer programs and/or modules, and the processor may implement various functions of the modulation device of the single-phase inverter by executing or executing the computer programs and/or modules stored in the memory and calling up the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the module/unit integrated with the modulation device of the single-phase inverter can be stored in a computer readable storage medium if the module/unit is realized in the form of a software functional unit and sold or used as an independent product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (8)

1. A topology of a single-phase inverter, comprising: the direct-current bus capacitor comprises a direct-current voltage input end, a direct-current filter inductor, a direct-current bus capacitor, an alternating-current filter inductor, four same switching devices and an alternating-current voltage output end; wherein the first switching devices each include: first controllable switch tube and first diode, the second switching device all includes: second controllable switch tube and second diode, third switching device all includes: third controllable switch tube and third diode, fourth switching device all includes: a fourth controllable switch tube and a fourth diode;
the collector of the first controllable switch tube is connected with the cathode of the first diode, and the emitter of the first controllable switch tube is connected with the anode of the first diode; the collector of the second controllable switch tube is connected with the cathode of the second diode, and the emitter of the second controllable switch tube is connected with the anode of the second diode; the collector of the third controllable switch tube is connected with the cathode of the third diode, and the emitter of the third controllable switch tube is connected with the anode of the third diode; a collector of the fourth controllable switching tube is connected with a cathode of the fourth diode, and an emitter of the fourth controllable switching tube is connected with an anode of the fourth diode; the emitter of the second controllable switch tube is connected with the emitter of the fourth controllable switch tube, and the collector of the first controllable switch tube is connected with the collector of the third controllable switch tube;
a positive pin of the direct-current voltage input end is connected to a midpoint between an emitter of the first controllable switch tube and a collector of the second controllable switch tube through the direct-current filter inductor, and a negative pin of the direct-current voltage input end is connected to the emitter of the second controllable switch tube;
the first end of the direct current bus capacitor is connected with the collector of the first controllable switch tube, and the second end of the direct current bus capacitor is connected with the emitter of the second controllable switch tube;
the alternating voltage first output end is connected with a midpoint between an emitter of the third controllable switch tube and a collector of the fourth controllable switch tube through the alternating filter inductor, and the alternating voltage second output end is connected with a midpoint between the emitter of the first controllable switch tube and the collector of the second controllable switch tube.
2. A modulation method of a single-phase inverter, applied to the topology of a single-phase inverter according to claim 1, comprising:
when the single-phase inverter works in a preset first period, modulating the first switching device and the second switching device according to an SPWM method, wherein the first switching device adopts a first modulation signal, and the second switching device adopts a second modulation signal; wherein the second modulation signal is 1-the first modulation signal;
performing fundamental frequency modulation on the third switching device and the fourth switching device, wherein a third modulation signal adopted by the third switching device is 1, the third switching device is always in a closed state, and a fourth modulation signal adopted by the fourth switching device is 0, the fourth switching device is always in an open state; wherein the fourth modulation signal is 1 — the third modulation signal;
the preset first period is ω t ∈ ((2k-2) pi, (2k-1) pi ], k ═ 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
3. The method of modulating a single-phase inverter of claim 2, the method further comprising:
when the single-phase inverter works in a preset second period, fundamental wave frequency modulation is performed on the first switching device and the second switching device, a fifth modulation signal adopted by the first switching device is 1, the first switching device is always in a closed state, and a sixth modulation signal adopted by the second switching device is 0, the second switching device is always in an open state; wherein the sixth modulation signal is 1-the fifth modulation signal;
modulating the third switching device and the fourth switching device according to an SPWM method, wherein the third switching device adopts a seventh modulation signal, and the fourth switching device adopts an eighth modulation signal; wherein the eighth modulation signal is 1 — the seventh modulation signal;
the preset second period is ω t ∈ ((2k-1) pi, 2k pi), k is 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
4. The modulation method of the single-phase inverter according to claim 2, wherein the first modulation signal is D1＝Uin/[Uin+Uabsin(ωt)](ii) a Wherein, UinIs the voltage at the DC voltage input, Uabsin (ω t) is the voltage difference between a first midpoint voltage between the emitter of the third controllable switch and the collector of the fourth controllable switch and a midpoint voltage between the emitter of the first controllable switch and the collector of the second controllable switch.
5. The modulation method of the single-phase inverter according to claim 3, wherein the seventh modulation signal is D7＝1+Uabsin(ωt)/Uin(ii) a Wherein, UinVoltage at the DC voltage input, Uabsin (ω t) is said third controllable onAnd the voltage difference between a second midpoint voltage between the emitter of the switch-off tube and the collector of the fourth controllable switch tube and a midpoint voltage between the emitter of the first controllable switch tube and the collector of the second controllable switch tube.
6. A modulation apparatus of a single-phase inverter, comprising:
the first control module is used for modulating the first switching device and the second switching device according to an SPWM method when the single-phase inverter works in a preset first period, wherein the first switching device adopts a first modulation signal, and the second switching device adopts a second modulation signal; wherein the second modulation signal is 1-the first modulation signal;
the second control module is used for performing fundamental frequency modulation on the third switching device and the fourth switching device, if a third modulation signal adopted by the third switching device is 1, the third switching device is always in a closed state, and if a fourth modulation signal adopted by the fourth switching device is 0, the fourth switching device is always in an open state; wherein the fourth modulation signal is 1 — the third modulation signal;
the preset first period is ω t ∈ ((2k-2) pi, (2k-1) pi ], k ═ 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
7. The modulation apparatus of a single-phase inverter according to claim 6, wherein the apparatus further comprises:
the third control module is configured to perform fundamental frequency modulation on the first switching device and the second switching device when the single-phase inverter operates in a preset second period, where a fifth modulation signal used by the first switching device is 1, the first switching device is always in a closed state, and a sixth modulation signal used by the second switching device is 0, the second switching device is always in an open state; wherein the sixth modulation signal is 1-the fifth modulation signal;
the fourth control module is used for modulating the third switching device and the fourth switching device according to an SPWM method, wherein the seventh modulation signal is adopted by the third switching device, and the eighth modulation signal is adopted by the fourth switching device; wherein the eighth modulation signal is 1 — the seventh modulation signal;
the preset second period is ω t ∈ ((2k-1) pi, 2k pi), k is 1,2,3 …, ω is the ac output fundamental wave angular frequency of the single-phase inverter, and t is time.
8. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the modulation method of the single-phase inverter according to any one of claims 2 to 4.
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