CN108429478A - A kind of single-phase three level T-type inverter efficiency optimal control method - Google Patents

A kind of single-phase three level T-type inverter efficiency optimal control method Download PDF

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CN108429478A
CN108429478A CN201810246323.7A CN201810246323A CN108429478A CN 108429478 A CN108429478 A CN 108429478A CN 201810246323 A CN201810246323 A CN 201810246323A CN 108429478 A CN108429478 A CN 108429478A
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loss
phase
level
switching tube
vsc
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杨飏
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Nanjing Institute of Railway Technology
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Nanjing Institute of Railway 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
    • H02M1/0048—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

Abstract

The invention discloses a kind of single-phase three level T-type inverter efficiency optimal control methods, it is characterised in that comprises the steps of：Measure T-type DC side voltage of converter vdc, output voltage voWith inductive current iL；Regard inverter as single-phase two level half-bridges VSC, calculates the turn-on consumption of switching tube, the reverse recovery loss of turn-off power loss and body diode；Calculate the turn-on consumption of the calculating switching tube of single-phase three level T-type VSC, the reverse recovery loss of turn-off power loss and body diode；Calculate the conduction loss P of IGBT devicetrWith body diode conduction loss Pd；According to output voltage voWith inductive current iLDetermine inverter operation mode；Calculate the total-power loss P3 of single-phase three level T-type VSC；Regard inverter as single-phase two level half-bridges VSC, calculates its total-power loss P2；If P3 is more than P2, inverter work is single-phase two level half-bridges VSC, and otherwise inverter work is single-phase three level T-type VSC.The present invention improves the working efficiency of single-phase three level T-type VSC.

Description

A kind of single-phase three level T-type inverter efficiency optimal control method
Technical field
The present invention relates to a kind of inverter efficiency optimal control method, especially a kind of single-phase three level T-type inverter effect Rate optimal control method.
Background technology
Because its is simple, reliability is high etc., reasons have been widely applied in many equipment two level VSC.With two level phases Than, multi-level converter only has the half of DC bus-bar voltage because of its commutation voltage, can reduce switching loss and harmonic loss, Improve output voltage quality.Meanwhile multi-level converter also results in the increase of system device quantity, and need neutral point voltage Balance control.Three level T-type VSC have many advantages in low-voltage equipment compared to NPC, with low conduction loss and efficiently Rate only needs additional three isolation gate pole driving power compared with two level VSC.3 level VSC have had both two level and three level The advantage of VSC.
In addition to the neutral point switch pipe of three level T-type VSC, single-phase three level T-type VSC has and single-phase two level half-bridge The identical circuits of VSC, main circuit are all made of two capacitances and two switching tubes, therefore single-phase three level T-type VSC can make It works for single-phase two level half-bridges VSC.It is identical in switching frequency and DC bus-bar voltage, single-phase three level T-type VSC Efficiency determined by amplitude modulation ratio.When amplitude modulation is smaller, single-phase three level T-type VSC efficiency is due to conduction loss Increase and reduce, conduction loss is determined by the duty ratio of neutral point switch pipe.Therefore, single compared to single-phase three level T-type VSC Two level half-bridge VSC of phase has lower conduction loss when amplitude modulation is relatively low.Therefore single-phase in low amplitude value modulation ratio Three level T-type VSC are operated under single-phase two level half-bridges VSC patterns, and in amplitude modulation ratio, single-phase three level T-type VSC It has higher efficiency.It is controlled according to actual conditions, the total losses of inverter can be reduced, improve single-phase three level T-type The working efficiency of VSC.
Invention content
Technical problem to be solved by the invention is to provide a kind of single-phase three level T-type inverter efficiency optimal control sides Method, which raises the working efficiencies of single-phase three level T-type VSC.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of single-phase three level T-type inverter efficiency optimal control method, it is characterised in that comprise the steps of：
Step 1：Measure T-type DC side voltage of converter vdc, output voltage voWith inductive current iL；
Step 2：Ignore the switching tube S of single-phase three level T-type inverter2And S3, regard inverter as single-phase two level half Bridge VSC calculates the turn-on consumption of switching tube, the reverse recovery loss of turn-off power loss and body diode；
Step 3：Calculate turn-on consumption, turn-off power loss and the body diode of the calculating switching tube of single-phase three level T-type VSC Reverse recovery loss；
Step 4：Calculate the conduction loss P of IGBT devicetrWith body diode conduction loss Pd；
Step 5：According to output voltage voWith inductive current iLDetermine inverter operation mode；
Step 6：The switching loss and conduction loss for calculating single-phase three level T-type VSC, to obtain its total-power loss P3；Ignore neutral point switch pipe S2And S3, regard inverter as single-phase two level half-bridges VSC, calculate its switching loss and conducting is damaged Consumption, to obtain its total-power loss P2；
Step 7：Compare the size of P2 and P3；If P3 is more than P2, inverter work is single-phase two level half-bridges VSC, otherwise Inverter work is single-phase three level T-type VSC.
Further, the step 2 specifically, in all operation modes, lead by switching tube S1 and switching tube S4 complementations Logical, switching loss includes conduction loss Pon2With turn-off power loss Poff2, while also diode reverse recovery losses Prr2；
VdcIt is DC bus-bar voltage, VdataIt is reference switch voltage in databook, A, B and C are constants, are being switched A, B are obtained by the IGBT switching losses of collector current equation in pipe databook, and C is anti-by the diode of collector current equation It is obtained to energy loss is restored.Wherein, angleIt is output voltage voWith inductive current iLPhase delay；
The conduction loss P of IGBT devicetrWith anti-paralleled diode conduction loss PdIt can be expressed as：
Ptr=(Vc0+Rs|iL|)|iL|
Pd=(Vd0+Rd|iL|)|iL|
Wherein Vc0And Vd0It is the on-state saturation voltage of IGBT device, resistance RsAnd RdIt is on state resistance, it can be by IGBT device VA characteristic curve and the databook of anti-paralleled diode obtain.
Further, the step 3 specifically,
In the single-phase three level T-type VSC courses of work, switching tube S1 and S3 is that complementation is led as switching tube S2 and S4 It is logical；In one cycle, the output voltage v of single-phase three level T-type VSCoFrom 0 to Vdc/2, or from-Vdc/2 to 0；Due to opening It closes pipe switching tube both end voltage in turn-on and turn-off and is reduced to Vdc/2, therefore switching tube switching loss accordingly reduces；Therefore：
Further, the step 4 specifically,
Single-phase two level half-bridges VSC switching tubes are made of IGBT device and body diode, and the loss of inverter is mainly by opening Loss and conduction loss composition are closed, switching loss and conduction loss can be by DC voltage vdc, output voltage voWith inductance electricity Flow iLIt obtains, four kinds of operation modes can be divided into according to the direction of output voltage and output current.Work as vo>=0 and iLIt is work when >=0 Make mode 2-1；Work as vo>=0 and iLIt is operation mode 2-2 when≤0；Work as vo≤ 0 and iLIt is operation mode 2-3 when≤0；Work as vo≤ 0 and iLIt is operation mode 2-4 when >=0；
In single-phase three level T-type VSC, four kinds of Working moulds can be divided into according to the direction of output voltage and output current State.Work as vo>=0 and iLIt is operation mode 3-1 when >=0；Work as vo>=0 and iLIt is operation mode 3-2 when≤0；Work as vo≤ 0 and iLWhen≤0 For operation mode 3-3；Work as vo≤ 0 and iLIt is operation mode 3-4 when >=0；
Work as vo>=0 and iLIt is operation mode 3-2 when≤0, switching tube S1 and S3 are worked alternatively；Switching tube S2 conductings, switching tube S1 and S2 is there are diode current flow loss, and there are IGBT conduction losses by switching tube S3；
Work as vo>=0 and iLIt is mode 3-1 when >=0, switching tube state is identical as 3-2, and diode loss is happened at switching tube S3, IGBT conduction loss are happened at switching tube S 1 and S2；Work as vo≤ 0 and iLWhen >=0, mode 3-3, switching tube S2 and S4 replace work Make；Switching tube S3 conductings, diode current flow loss are happened at switching tube S3 and S4, and IGBT conduction losses are happened at S2；
Work as vo≤ 0 and iL≤ 0, mode 3-4 are identical as mode 3-3；Diode current flow loss is happened at switching tube S2, IGBT Conduction loss is happened at switching tube S3 and S4.
Further, the step 5 specifically,
The switching loss and conduction loss for calculating single-phase three level T-type VSC, to obtain its total-power loss P3；
In a controlling cycle, master switch loss is：
Psw2=Pon2+Poff2+Prr2
In a controlling cycle, conduction loss is determined by duty ratio, and the duty ratio of switching tube S1 can be expressed as：
Thus, duty ratio is determined by output voltage；Conduction loss is different in each operation mode, single-phase two In level half-bridge VSC, conduction loss is by electric current iLIt determines, as electric current iLWhen≤0, it is operated in mode 2-2 or mode 2-3, two Pole pipe conduction loss is happened at switching tube S1, IGBT conduction loss and is happened at switching tube S4, as electric current iLWhen >=0, then phase Instead, duty ratio is different from mode 2-2 and mode 2-3；
Pcon2=D2Pd+(1-D2)Ptr
Pcon2=D2Ptr+(1-D2)Pd
P2=Psw2+Pcon2
Ignore neutral point switch pipe S2And S3, regard inverter as single-phase two level half-bridges VSC, calculate its switching loss and Conduction loss, to obtain its total-power loss P2；
The duty ratio of single-phase three level T-type VSC can be expressed as：
Mode 3-1 and mode 3-3 formula：
Pcon3=D3Pd+(1-D3)Ptr+(1-D3)Pd
Mode 3-2 and mode 3-4 formula：
Pcon3=D3Ptr+(1-D3)Ptr+(1-D3)Pd
Therefore, total-power loss：
P3=Psw3+Pcon3。
Compared with prior art, the present invention haing the following advantages and effect：The present invention exists according to inverter total losses size Working condition switching, drop are carried out between single-phase three level T-type voltage source converter and single-phase two level half-bridges voltage source converter The low total losses of inverter, improve the working efficiency of single-phase three level T-type VSC.
Description of the drawings
Fig. 1 is the schematic diagram of the single-phase three level T-type inverter of the present invention.
Fig. 2 is the equivalent circuit diagram for ignoring intermediate switch pipe of the single-phase three level T-type inverter of the present invention.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following embodiment is to this hair Bright explanation and the invention is not limited in following embodiments.
As shown in Fig. 2, the equivalent circuit diagram for ignoring intermediate switch pipe of single-phase three level T-type inverter, as single-phase two Level half-bridge VSC.
Single-phase two level half-bridges VSC switching tubes are made of IGBT device and body diode, and the loss of inverter is mainly by opening Loss and conduction loss composition are closed, switching loss and conduction loss can be by DC voltage vdc, output voltage voWith inductance electricity Flow iLIt obtains, four kinds of operation modes can be divided into according to the direction of output voltage and output current.Work as vo>=0 and iLIt is work when >=0 Make mode 2-1；Work as vo>=0 and iLIt is operation mode 2-2 when≤0；Work as vo≤ 0 and iLIt is operation mode 2-3 when≤0；Work as vo≤ 0 and iLIt is operation mode 2-4 when >=0.
In all operation modes, switching tube S1 and switching tube S4 complementations conducting, switching loss includes conduction loss Pon2 With turn-off power loss Poff2, while also diode reverse recovery losses Prr2
VdcIt is DC bus-bar voltage, VdataIt is reference switch voltage in databook, A, B and C are constants, are being switched A, B are obtained by the IGBT switching losses of collector current equation in pipe databook, and C is anti-by the diode of collector current equation It is obtained to energy loss is restored.Wherein, angleIt is output voltage voWith inductive current iLPhase delay.Week is controlled at one Interim, master switch loss is：
Psw2=Pon2+Poff2+Prr2 (5)
The conduction loss P of IGBT devicetrWith anti-paralleled diode conduction loss PdIt can be expressed as：
Ptr=(Vc0+Rs|iL|)|iL| (6)
Pd=(Vd0+Rd|iL|)|iL| (7)
Wherein Vc0And Vd0It is the on-state saturation voltage of IGBT device, resistance RsAnd RdIt is on state resistance, it can be by IGBT device VA characteristic curve and the databook of anti-paralleled diode obtain.
In a controlling cycle, conduction loss is determined by duty ratio, and the duty ratio of switching tube S1 can be expressed as：
It can be obtained by formula (8), duty ratio is determined by output voltage.Conduction loss is different in each operation mode. In single-phase two level half-bridges VSC, conduction loss is by electric current iLIt determines, as electric current iLWhen≤0, it is operated in mode 2-2 or mode 2-3, diode current flow loss is happened at switching tube S1, IGBT conduction loss and is happened at switching tube S4, as electric current iL>=0 when It waits, then on the contrary, duty ratio is different from mode 2-2 and mode 2-3.
Pcon2=D2Pd+(1-D2)Ptr (9)
Pcon2=D2Ptr+(1-D2)Pd (10)
P2=Psw2+Pcon2 (11)
As shown in Figure 1, in the single-phase three level T-type VSC courses of work, switching tube S1 and S3 is as switching tube S2 and S4 All it is complementary conducting.In one cycle, the output voltage v of single-phase three level T-type VSCoFrom 0 to Vdc/2, or from-Vdc/2 To 0.Since in turn-on and turn-off, switching tube both end voltage is reduced to Vdc/2 to switching tube, switching tube switching loss is corresponding Reduce.Therefore：
The duty ratio of single-phase three level T-type VSC can be expressed as：
When electric current flows through switching tube S2 and S3, since the conduction loss of anti-paralleled diode and IGBT exist, conducting Loss is twice of single-phase two level half-bridges VSC.Therefore, if the conduction ratio of switching tube S2 and S3 are sufficiently high, single-phase three level T Type VSC is than single-phase two level half-bridges VSC highers.In single-phase three level T-type VSC, according to the side of output voltage and output current To four kinds of operation modes can be divided into.Work as vo>=0 and iLIt is operation mode 3-1 when >=0；Work as vo>=0 and iLIt is Working mould when≤0 State 3-2；Work as vo≤ 0 and iLIt is operation mode 3-3 when≤0；Work as vo≤ 0 and iLIt is operation mode 3-4 when >=0.
Work as vo>=0 and iLIt is operation mode 3-2 when≤0, switching tube S1 and S3 are worked alternatively.Switching tube S2 conductings, switching tube S1 and S2 is there are diode current flow loss, and there are IGBT conduction losses by switching tube S3.
Work as vo>=0 and iLIt is mode 3-1 when >=0, switching tube state is identical as 3-2, and diode loss is happened at switching tube S3, IGBT conduction loss are happened at switching tube S1 and S2.
Work as vo≤ 0 and iLWhen >=0, mode 3-3, switching tube S2 and S4 are worked alternatively.Switching tube S3 conductings, diode current flow Loss is happened at switching tube S3 and S4, and IGBT conduction losses are happened at S2.
Work as vo≤ 0 and iL≤ 0, mode 3-4 are identical as mode 3-3.Diode current flow loss is happened at switching tube S2, IGBT Conduction loss is happened at switching tube S3 and S4.Therefore：
Mode 3-1 and mode 3-3 formula：
Pcon3=D3Pd+(1-D3)Ptr+(1-D3)Pd
(16)
Mode 3-2 and mode 3-4 formula：
Pcon3=D3Ptr+(1-D3)Ptr+(1-D3)Pd
(17)
Therefore, total-power loss：
P3=Psw3+Pcon3
(18)
Strategy step proposed by the present invention：
(1) DC voltage v is measureddc, output voltage voWith inductive current iL；
(2) 1-4,6-7 of calculation formula and 12-14.Ignore neutral point switch pipe S2And S3, regard inverter as single-phase two electricity Flat half-bridge VSC calculates the turn-on consumption of switching tube, the reverse recovery loss of turn-off power loss and body diode.Calculate single-phase three electricity The turn-on consumption of the calculating switching tube of flat T-type VSC, the reverse recovery loss of turn-off power loss and body diode.Calculate IGBT device Conduction loss PtrWith body diode conduction loss Pd
(3) according to output voltage voWith inductive current iLDetermine inverter operation mode；
(4) calculation formula 5,8-11,15-18.The switching loss and conduction loss of single-phase three level T-type VSC are calculated, to Obtain its total-power loss P3.Ignore neutral point switch pipe S2And S3, regard inverter as single-phase two level half-bridges VSC, calculate it Switching loss and conduction loss, to obtain its total-power loss P2；
(5) compare the size of P2 and P3.If P3 is more than P2, inverter work is single-phase two level half-bridges VSC, otherwise inverse Become device work as single-phase three level T-type VSC.
Described in this specification above content is only illustrations made for the present invention.Technology belonging to the present invention The technical staff in field can do various modifications or supplement to described specific embodiment or substitute by a similar method, only The guarantor of the present invention should all be belonged to without departing from the content or beyond the scope defined by this claim of description of the invention Protect range.

Claims (5)

1. a kind of single-phase three level T-type inverter efficiency optimal control method, it is characterised in that comprise the steps of：
Step 1：Measure T-type DC side voltage of converter vdc, output voltage voWith inductive current iL；
Step 2：Ignore the switching tube S of single-phase three level T-type inverter2And S3, regard inverter as single-phase two level half-bridge VSC calculates the turn-on consumption of switching tube, the reverse recovery loss of turn-off power loss and body diode；
Step 3：Calculate the anti-of the calculating turn-on consumption of switching tube of single-phase three level T-type VSC, turn-off power loss and body diode It is lost to recovery；
Step 4：Calculate the conduction loss P of IGBT devicetrWith body diode conduction loss Pd；
Step 5：According to output voltage voWith inductive current iLDetermine inverter operation mode；
Step 6：The switching loss and conduction loss for calculating single-phase three level T-type VSC, to obtain its total-power loss P3；Suddenly Slightly neutral point switch pipe S2And S3, regard inverter as single-phase two level half-bridges VSC, calculates its switching loss and conduction loss, from And obtain its total-power loss P2；
Step 7：Compare the size of P2 and P3；If P3 is more than P2, inverter work is single-phase two level half-bridges VSC, otherwise inversion Device work is single-phase three level T-type VSC.
2. the single-phase three level T-type inverter efficiency optimal control method of one kind described in accordance with the claim 1, it is characterised in that： The step 2 is specifically, in all operation modes, and switching tube S1 and switching tube S4 complementations conducting, switching loss includes leading Logical loss Pon2With turn-off power loss Poff2, while also diode reverse recovery losses Prr2；
VdcIt is DC bus-bar voltage, VdataIt is reference switch voltage in databook, A, B and C are constants, in switching tube number It is obtained by the IGBT switching losses of collector current equation according to A, B in handbook, C is reversely extensive by the diode of collector current equation Multiple energy loss obtains.Wherein, angleIt is output voltage voWith inductive current iLPhase delay；
The conduction loss P of IGBT devicetrWith anti-paralleled diode conduction loss PdIt can be expressed as：
Ptr=(Vc0+Rs|iL|)|iL|
Pd=(Vd0+Rd|iL|)|iL|
Wherein Vc0And Vd0It is the on-state saturation voltage of IGBT device, resistance RsAnd RdIt is on state resistance, it can be by the volt of IGBT device The databook of peace characteristic curve and anti-paralleled diode obtains.
3. the single-phase three level T-type inverter efficiency optimal control method of one kind described in accordance with the claim 1, it is characterised in that： The step 3 specifically,
In the single-phase three level T-type VSC courses of work, switching tube S1 and S3 is complementary conducting as switching tube S2 and S4； In one cycle, the output voltage v of single-phase three level T-type VSCoFrom 0 to Vdc/2, or from-Vdc/2 to 0；Due to switch Pipe switching tube both end voltage in turn-on and turn-off is reduced to Vdc/2, therefore switching tube switching loss accordingly reduces；Therefore：
4. the single-phase three level T-type inverter efficiency optimal control method of one kind described in accordance with the claim 1, it is characterised in that： The step 4 specifically,
Single-phase two level half-bridges VSC switching tubes are made of IGBT device and body diode, and the loss of inverter is mainly damaged by switch Consumption and conduction loss composition, switching loss and conduction loss can be by DC voltage vdc, output voltage voWith inductive current iL It obtains, four kinds of operation modes can be divided into according to the direction of output voltage and output current.Work as vo>=0 and iLIt is Working mould when >=0 State 2-1；Work as vo>=0 and iLIt is operation mode 2-2 when≤0；Work as vo≤ 0 and iLIt is operation mode 2-3 when≤0；Work as vo≤ 0 and iL≥ It is operation mode 2-4 when 0；
In single-phase three level T-type VSC, four kinds of operation modes can be divided into according to the direction of output voltage and output current.Work as vo >=0 and iLIt is operation mode 3-1 when >=0；Work as vo>=0 and iLIt is operation mode 3-2 when≤0；Work as vo≤ 0 and iLIt is work when≤0 Mode 3-3；Work as vo≤ 0 and iLIt is operation mode 3-4 when >=0；
Work as vo>=0 and iLIt is operation mode 3-2 when≤0, switching tube S1 and S3 are worked alternatively；Switching tube S2 conducting, switching tube S1 and S2 is there are diode current flow loss, and there are IGBT conduction losses by switching tube S3；
Work as vo>=0 and iLIt is mode 3-1 when >=0, switching tube state is identical as 3-2, and diode loss is happened at switching tube S3, IGBT conduction losses are happened at switching tube S1 and S2；
Work as vo≤ 0 and iLWhen >=0, mode 3-3, switching tube S2 and S4 are worked alternatively；Switching tube S3 conductings, diode current flow loss It is happened at switching tube S3 and S4, IGBT conduction losses are happened at S2；
Work as vo≤ 0 and iL≤ 0, mode 3-4 are identical as mode 3-3；Diode current flow loss is happened at switching tube S2, IGBT conducting Loss is happened at switching tube S3 and S4.
5. the single-phase three level T-type inverter efficiency optimal control method of one kind described in accordance with the claim 1, it is characterised in that： The step 5 specifically,
The switching loss and conduction loss for calculating single-phase three level T-type VSC, to obtain its total-power loss P3；
In a controlling cycle, master switch loss is：
Psw2=Pon2+Poff2+Prr2
In a controlling cycle, conduction loss is determined by duty ratio, and the duty ratio of switching tube S1 can be expressed as：
Thus, duty ratio is determined by output voltage；Conduction loss is different in each operation mode, in single-phase two level In half-bridge VSC, conduction loss is by electric current iLIt determines, as electric current iLWhen≤0, it is operated in mode 2-2 or mode 2-3, diode Conduction loss is happened at switching tube S1, IGBT conduction loss and is happened at switching tube S4, as electric current iLWhen >=0, then on the contrary, accounting for Empty ratio is different from mode 2-2 and mode 2-3；
Pcon2=D2Pd+(1-D2)Ptr
Pcon2=D2Ptr+(1-D2)Pd
P2=Psw2+Pcon2
Ignore neutral point switch pipe S2And S3, regard inverter as single-phase two level half-bridges VSC, calculate its switching loss and conducting Loss, to obtain its total-power loss P2；The duty ratio of single-phase three level T-type VSC can be expressed as：
Mode 3-1 and mode 3-3 formula：
Pcon3=D3Pd+(1-D3)Ptr+(1-D3)Pd
Mode 3-2 and mode 3-4 formula：
Pcon3=D3Ptr+(1-D3)Ptr+(1-D3)Pd
Therefore, total-power loss：
P3=Psw3+Pcon3。
CN201810246323.7A 2018-03-23 2018-03-23 A kind of single-phase three level T-type inverter efficiency optimal control method Pending CN108429478A (en)

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CN109149986A (en) * 2018-10-11 2019-01-04 昆明理工大学 The hybrid Modular multilevel converter of one type, three level and its control method
CN110429822A (en) * 2019-08-07 2019-11-08 西北工业大学 A kind of T-type LLC resonant converter and its control method

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Application publication date: 20180821