CN104467436A - Three-port direct-current converter device and hybrid modulation method and closed loop control method thereof - Google Patents
Three-port direct-current converter device and hybrid modulation method and closed loop control method thereof Download PDFInfo
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- CN104467436A CN104467436A CN201410700892.6A CN201410700892A CN104467436A CN 104467436 A CN104467436 A CN 104467436A CN 201410700892 A CN201410700892 A CN 201410700892A CN 104467436 A CN104467436 A CN 104467436A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a three-port direct-current converter device and a hybrid modulation method and closed loop control method of the three-port direct-current converter device. The direct-current converter device comprises a main circuit and a control circuit, wherein the main circuit comprises a double-input full-bridge inverter, a high-frequency transformer, a half-bridge full-control rectifier and a voltage stabilization capacitor; the control circuit comprises a storage battery voltage sampling circuit, a storage battery current sampling circuit, a photovoltaic battery voltage sampling circuit, a photovoltaic battery current sampling circuit, a full-bridge inverter current sampling circuit and an output voltage sampling circuit, the output end of the storage battery voltage sampling circuit, the output end of the storage battery current sampling circuit, the output end of the photovoltaic battery voltage sampling circuit, the output end of the photovoltaic battery current sampling circuit, the output end of the full-bridge inverter current sampling circuit and the output end of the output voltage sampling circuit are connected to a digital signal processor, and the signal output end of the digital signal processor is connected with a first MOS transistor driving circuit, a second MOS transistor driving circuit, a third MOS transistor driving circuit, a fourth MOS transistor driving circuit, a fifth IGBT driving circuit and a sixth IGBT driving circuit. According to the three-port direct-current converter device, cost is saved, and the three-port direct-current converter device can be used in electrical equipment.
Description
Technical field
The present invention relates to a kind of DC converter, particularly a kind of multi-input direct current converter.
Background technology
Multi input power converter, new forms of energy, as a kind of novel Technics of Power Electronic Conversion device, are effectively combined with energy-storage travelling wave tube by it, improve inverter power density, reliability and transient response speed.Photovoltaic cell is as the more new forms of energy of Application and Development, there is supply power voltage instability, discontinuous, change with climate and weather condition, and maximum power output is directly by illumination intensity effect, take photovoltaic as input energy sources, be integrated with the multi input power converter of energy-storage travelling wave tube, utilize energy-storage travelling wave tube to carry out power adjustments when photovoltaic exporting change, realize proof load demand while photovoltaic cell works in best operating point.When realizing multiple-energy-source input electric power converter topology structure choice; in order to realize the energy transferring between different port; usually can increase power tube quantity to realize energy flow, thus cause transformer configuration complexity, cost, control complicated, reliability reduction.The multiplex analog circuit of phase-shift PWM coordinates DSP and FPGA to realize, and these methods exist the shortcomings such as realization is complicated, control precision finite sum controlling functions is single.
Summary of the invention
The object of this invention is to provide a kind of three-port DC converter device and hybrid modulation method thereof and closed loop control method, cost-saving, ensure to export voltage stabilizing and power flow controls.
The object of the present invention is achieved like this: a kind of three-port DC converter device and hybrid modulation method thereof and closed loop control method, and described DC converting apparatus comprises main circuit and control circuit:
Main circuit comprises double-input full bridge inverter, high frequency transformer, half-bridge full-controlled rectifier device and electric capacity of voltage regulation C
5;
Described double-input full bridge inverter comprises first input end mouth P-E, the second input port E-Q, output port A-B, the first filter capacitor C
1, the second filter capacitor C
2, the first inductance L
1, the first metal-oxide-semiconductor S
1, the second metal-oxide-semiconductor S
2, the 3rd metal-oxide-semiconductor S
3with the 4th metal-oxide-semiconductor S
4; First input end mouth P-E accesses storage battery, second input port E-Q accesses photovoltaic cell, battery positive voltage access electrode points P, battery terminal negative access electrode points E, photovoltaic cell positive pole access electrode points E, photovoltaic cell negative pole access electrode points Q, is connected in series the first filter capacitor C between electrode points P with electrode points E
1, between electrode points E and electrode points Q, be serially connected with the second filter capacitor C
2, between electrode points P and electrode points A, be connected in series the first metal-oxide-semiconductor S
1, between electrode points A and electrode points Q, be connected in series the second metal-oxide-semiconductor S
2, between electrode points P and electrode points B, be connected in series the 3rd metal-oxide-semiconductor S
3, between electrode points B and electrode points Q, be connected in series the 4th metal-oxide-semiconductor S
4, between electrode points A and electrode points E, be serially connected with the first inductance L
1;
Half-bridge full-controlled rectifier device comprises input port C-D, output port M-N, the 5th IGBT pipe S
5, the 6th IGBT pipe S
6, the 3rd filter capacitor C
3and the 4th filter capacitor C
4, between electrode points M and electrode points C, be connected in series the 5th IGBT pipe S
5, between electrode points C and electrode points N, be connected in series the 6th IGBT pipe S
6, serial capacitance C between electrode points M and electrode points D
3, serial capacitance C between electrode points D and electrode points N
4;
Electrode points A connects leakage inductance L
rbe connected to electrode points B afterwards on the former limit of high frequency transformer, on the secondary connecting electrode point C and electrode points D of high frequency transformer;
Described electric capacity of voltage regulation C
5be serially connected between electrode points M and electrode points N;
Described control circuit comprises output and is connected to battery tension sample circuit, battery current sample circuit, photovoltaic cell voltage sampling circuit, photovoltaic cell current sampling circuit, full-bridge inverter current sampling circuit, output voltage sampling circuit on digital signal processor, and the signal output part of described digital signal processor is connected with the first metal-oxide-semiconductor drive circuit, the second metal-oxide-semiconductor drive circuit, the 3rd metal-oxide-semiconductor drive circuit, the 4th metal-oxide-semiconductor drive circuit, the 5th IGBT tube drive circuit, the 6th IGBT tube drive circuit;
Described hybrid modulation method is as follows: by the first metal-oxide-semiconductor S
1with the second metal-oxide-semiconductor S
2drive singal be set to complementation, calculate the first metal-oxide-semiconductor S by maximum power tracing algorithm
1duty ratio, make the 3rd metal-oxide-semiconductor S
3with the 4th metal-oxide-semiconductor S
4complementary and the 3rd metal-oxide-semiconductor S of drive singal
3duty ratio and the first metal-oxide-semiconductor S
1identical, keep the first metal-oxide-semiconductor S
1with the 3rd metal-oxide-semiconductor S
3between phase shifting angle be 180 °, make the 5th IGBT pipe S
5with the 6th IGBT pipe S
6drive singal complementary and duty ratio is 0.5, keep the first metal-oxide-semiconductor S
1with the 5th IGBT pipe S
5rising edge between keep certain phase shifting angle
, and phase shifting angle
meet
, wherein
=
,
=
, δ is the first metal-oxide-semiconductor S
1the high level mid point of drive singal and the 5th metal-oxide-semiconductor S
5phase shifting angle between the high level mid point of drive singal,
be the first metal-oxide-semiconductor S
1duty ratio,
be the 5th IGBT pipe S
5duty ratio;
Described closed loop control method is as follows, by regulating the duty ratio of former limit dual input inverter, realizes the input maximum power tracing of photovoltaic and the function of dual input inversion simultaneously; By sampling to secondary half-bridge full-controlled rectifier device output voltage, compare with output voltage desired value after doing difference and give voltage controller, the output of voltage controller is given duty ratio/phase shifting angle modulator and is obtained the phase shifting angle of half-bridge full-controlled rectifier device square-wave modulation signal relative to former limit square-wave modulation signal after modulating, phase shifting angle scope is set to-90 ° ~ 90 °, by regulating phase shifting angle to control output voltage and power flow direction, two-wayly can transmitted power size can to control via voltage close loop output valve amplitude limit.
Compared with prior art, beneficial effect of the present invention is, the present invention uses the first metal-oxide-semiconductor, second metal-oxide-semiconductor coordinates the first inductance to can be used as a step-up/step-down circuit, first metal-oxide-semiconductor simultaneously, second metal-oxide-semiconductor, 3rd metal-oxide-semiconductor, reversion reaction is played in 4th metal-oxide-semiconductor cooperation, thus saved one group of metal-oxide-semiconductor, save cost, by regulating the duty ratio of former limit inverter, realize the maximum power tracing of photovoltaic, and ensure that inverter circuit normally works, simultaneously, sampled by secondary output voltage, regulate the phase shifting angle of former limit inverter and secondary rectifier, realize exporting voltage stabilizing and power flow control.The present invention can be used in photovoltaic generation.
As further restriction of the present invention, the input of described photovoltaic cell voltage sampling circuit is connected on main circuit photovoltaic cell input positive pole, the output of photovoltaic cell voltage sampling circuit is connected on digital signal processor, voltage signal by bleeder circuit dividing potential drop, then exports to digital signal processor after filter capacitor filtering; Described battery tension sample circuit is identical with photovoltaic cell voltage sampling circuit.
As further restriction of the present invention, the input of described battery current sample circuit is serially connected between main circuit storage battery input positive pole and storage battery, the output of described battery current sample circuit is connected on digital signal processor, current signal carries out filtering again through current sensor sampling after dividing potential drop, and filtered signal gives digital signal processor; Described photovoltaic cell current sampling circuit is identical with battery current sample circuit with full-bridge inverter current sampling circuit.
As further restriction of the present invention, the input of described output voltage sampling circuit is connected on main circuit electrode points M and electrode points N, the output of described output voltage sampling circuit is connected on digital signal processor, voltage signal is converted into electric current through sampling resistor, amplified after the conversion of Hall voltage transmitter, be converted into corresponding voltage through low-pressure side sampling resistor, then export to digital signal processor through low pass filter.
As further restriction of the present invention, described digital signal processor adopts dsPIC33FJ64GS606 chip.
Accompanying drawing explanation
Fig. 1 is main circuit schematic diagram of the present invention.
Fig. 2 is control circuit module map of the present invention.
Fig. 3 is photovoltaic cell voltage sampling circuit schematic diagram in the present invention.
Fig. 4 is battery current sample circuit schematic diagram in the present invention.
Fig. 5 is output voltage sampling circuit schematic diagram in the present invention.
Fig. 6 is Central Plains of the present invention limit duty ratio D
pthe waveform of each signal when being greater than 0.5.
Fig. 7 is Central Plains of the present invention limit duty ratio D
pthe waveform of each signal when being less than 0.5.
Output voltage control logic schematic diagram in Fig. 8 the present invention.
Embodiment
A kind of three-port DC converter device as shown in Figure 1-2, comprises main circuit and control circuit:
Main circuit comprises double-input full bridge inverter, high frequency transformer, half-bridge full-controlled rectifier device and electric capacity of voltage regulation C
5;
Described main circuit comprises double-input full bridge inverter, high frequency transformer, half-bridge full-controlled rectifier device and electric capacity of voltage regulation.Described double-input full bridge inverter comprises port P-E, port E-Q, port A-B, filter capacitor C
1, filter capacitor C
2, inductance L
1, the first metal-oxide-semiconductor S
1, the second metal-oxide-semiconductor S
2, the 3rd metal-oxide-semiconductor S
3with the 4th metal-oxide-semiconductor S
4; Double-input full bridge inverter double input end is respectively accumulator terminal P-E and photovoltaic cell end E-Q; battery positive voltage access electrode points P; battery terminal negative access electrode points E; photovoltaic cell positive pole forward accesses electrode points E after connecting one and protecting diode; photovoltaic cell negative pole access electrode points Q, is serially connected with filter capacitor C between storage battery input positive pole P and electrode points E
1, electrode points E and photovoltaic cell input between negative pole Q and are serially connected with filter capacitor C
2, between electrode points P and electrode points B, be connected in series the 3rd metal-oxide-semiconductor S
3, between electrode points B and electrode points Q, be connected in series the 4th metal-oxide-semiconductor S
4, between electrode points P and electrode points A, be connected in series the first metal-oxide-semiconductor S
1, between electrode points A and electrode points Q, be connected in series the second metal-oxide-semiconductor S
2, metal-oxide-semiconductor S
1with metal-oxide-semiconductor S
2between electrode points A and electrode points E between be serially connected with inductance L
1, wherein inductance L
1, the first metal-oxide-semiconductor S
1, the second metal-oxide-semiconductor S
2can be used as again a step-up/step-down circuit, half-bridge full-controlled rectifier device comprises port C-D, port M-N, the 5th IGBT pipe S
5, the 6th IGBT pipe S
6, electric capacity C
3and electric capacity C
4, between electrode points M and electrode points C, be connected in series the 5th IGBT pipe S
5, between electrode points C and electrode points N, be connected in series the 6th IGBT pipe S
6, serial capacitance C between electrode points M and electrode points D
3, serial capacitance C between electrode points D and electrode points N
4.Described high frequency transformer T
rformer limit and series connection leakage inductance L thereof
rbe connected on double-input full bridge inverter circuit electrode points A and electrode points B, described high frequency transformer T
rsecondary is connected on half-bridge full-controlled rectifier device circuit electrode point C and electrode points D.Described electric capacity of voltage regulation C
5be serially connected between electrode points M and electrode points N, described digital signal processor adopts dsPIC33FJ64GS606 chip; Half-bridge full-controlled rectifier device comprises input port C-D, output port M-N, the 5th IGBT pipe S
5, the 6th IGBT pipe S
6, the 3rd filter capacitor C
3and the 4th filter capacitor C
4, between electrode points M and electrode points C, be connected in series the 5th IGBT pipe S
5, between electrode points C and electrode points N, be connected in series the 6th IGBT pipe S
6, serial capacitance C between electrode points M and electrode points D
3, serial capacitance C between electrode points D and electrode points N
4;
Electrode points A connects leakage inductance L
rbe connected to electrode points B afterwards on the former limit of high frequency transformer, on the secondary connecting electrode point C and electrode points D of high frequency transformer;
Described electric capacity of voltage regulation C
5be serially connected between electrode points M and electrode points N;
Described control circuit comprises output and is connected to battery tension sample circuit, battery current sample circuit, photovoltaic cell voltage sampling circuit, photovoltaic cell current sampling circuit, full-bridge inverter current sampling circuit, output voltage sampling circuit on digital signal processor, and the signal output part of described digital signal processor is connected with the first metal-oxide-semiconductor drive circuit, the second metal-oxide-semiconductor drive circuit, the 3rd metal-oxide-semiconductor drive circuit, the 4th metal-oxide-semiconductor drive circuit, the 5th IGBT tube drive circuit, the 6th IGBT tube drive circuit; The input of described photovoltaic cell voltage sampling circuit is connected on main circuit photovoltaic cell input positive pole E, the output of photovoltaic cell voltage sampling circuit is connected on digital signal processor, voltage signal by bleeder circuit dividing potential drop, then exports to digital signal processor after filter capacitor filtering; Described battery tension sample circuit is identical with photovoltaic cell voltage sampling circuit; The input of described battery current sample circuit is serially connected between main circuit storage battery input positive pole P and storage battery, the output of described battery current sample circuit is connected on digital signal processor, current signal carries out filtering again through current sensor U10 sampling after dividing potential drop, filtered signal gives digital signal processor, and described photovoltaic cell current sampling circuit is identical with battery current sample circuit with full-bridge inverter current sampling circuit; The input of described output voltage sampling circuit is connected on main circuit electrode points M and electrode points N, the output of described output voltage sampling circuit is connected on digital signal processor, voltage signal is converted into through sampling resistor R15 the electric current that rated value is 25mA, 0.4 times is amplified after Hall voltage transmitter U8 converts, be converted into corresponding voltage through low-pressure side sampling resistor R17, then export to digital signal processor through the low pass filter that resistance R16 electric capacity C16 forms.
Main circuit operation principle proposed by the invention: adopt asymmetric hybrid modulation method, as shown in Figure 6 and Figure 7, its sets forth when former limit full-bridge duty ratio be greater than 0.5 with oscillogram when being less than 0.5.Wherein
v s1 ,
v s2 ,
v s3 ,
v s4 ,
v s1 ,
v s5 ,
v s6 be respectively the first metal-oxide-semiconductor S
1, the second metal-oxide-semiconductor S
2, the 3rd metal-oxide-semiconductor S
3, the 4th metal-oxide-semiconductor S
4, the 5th IGBT pipe S
5, the 6th IGBT pipe S
6gate pole and voltage waveform separately between grid, specify that upper and lower two the power tube drive waveforms of each brachium pontis are complementary relationship, namely
v s1 with
v s2 complementation,
v s3 with
v s4 complementation,
v s5 with
v s6 complementation, and
v s1 waveform high level mid point is advanced
v s3 waveform high level mid point half switch periods, i.e. phase shift half switch periods.
v s1 rising edge with
v s5 rising edge between there is phase shifting angle;
v aB ,
v cD be respectively former limit inverter leg mid-point voltage and secondary half-bridge full-controlled rectifier device brachium pontis mid-point voltage,
i r for flowing through the electric current of transformer, D
pbe the first metal-oxide-semiconductor S
1with the 3rd metal-oxide-semiconductor S
3duty ratio, D
sbe the 5th IGBT pipe S
5duty ratio, δ is
v s1 high level mid point with
v s5 high level mid point between phase shifting angle,
for
v s5 rising edge with
v s1 rising edge between phase shifting angle.
From waveform analysis, as duty ratio D
p>0.5 and D
pduring <0.5, D
p, D
s, δ,
and the pass between ε is:
D
p>0.5
D
p<0.5
Work as D
pwhen=0.5,
=δ;
Regulation:
Can be obtained by above formula:
；
By with co-relation, can according to current former limit duty ratio D
p, secondary duty ratio D
swith
v s1 high level mid point with
v s5 high level mid point between phase shifting angle δ, δ can it directly draws by the voltage controller in digital signal processor, goes out according to above-mentioned formulae discovery
v s5 rising edge with
v s1 rising edge between phase shifting angle
.
Output voltage control principle: as shown in Figure 8, G
vfor controlling phase shifting angle to output voltage V
mNtransfer function, H
vfor the transfer function of output voltage sampling circuit.At output voltage V
mNduring control, the output δ of voltage controller is
v s5 high level mid point with
v s1 high level mid point between phase shifting angle, the output of duty ratio/phase shifting angle modulator
for
v s5 rising edge with
v s1 rising edge between phase shifting angle, it can according to the duty ratio D of the output δ of current voltage controller and former limit full-bridge inverter
pwith secondary half-bridge full-controlled rectifier device duty ratio D
sdetermine.The output δ of voltage controller controls between-90 ° ~ 90 °, when normally powering to the load, the output δ of pressure controller is between 0 ~ 90 °, if because output port rear class has energy back, the output δ of pressure controller is between-90 ° ~ 0, namely change power flow direction, load is charged to battery.By regulating δ to control output voltage and power flow direction, two-wayly can transmitted power size can to control via voltage close loop output valve amplitude limit.
Described closed loop control method is as follows, by regulating the duty ratio of former limit dual input inverter, realizes the input maximum power tracing of photovoltaic and the function of dual input inversion simultaneously; By sampling to secondary half-bridge full-controlled rectifier device output voltage, compare with output voltage desired value after doing difference and give voltage controller, the output of voltage controller is given duty ratio/phase shifting angle modulator and is obtained the phase shifting angle of half-bridge full-controlled rectifier device square-wave modulation signal relative to former limit square-wave modulation signal after modulating, phase shifting angle scope is set to-90 ° ~ 90 °, by regulating phase shifting angle to control output voltage and power flow direction, two-wayly can transmitted power size can to control via voltage close loop output valve amplitude limit.
The present invention is not limited to above-described embodiment; on the basis of technical scheme disclosed by the invention; those skilled in the art is according to disclosed technology contents; do not need performing creative labour just can make some to some technical characteristics wherein to replace and distortion, these are replaced and are out of shape all in protection scope of the present invention.
Claims (7)
1. a three-port DC converter device, is characterized in that, comprises main circuit and control circuit:
Main circuit comprises double-input full bridge inverter, high frequency transformer, half-bridge full-controlled rectifier device and electric capacity of voltage regulation C
5;
Described double-input full bridge inverter comprises first input end mouth P-E, the second input port E-Q, output port A-B, the first filter capacitor C
1, the second filter capacitor C
2, the first inductance L
1, the first metal-oxide-semiconductor S
1, the second metal-oxide-semiconductor S
2, the 3rd metal-oxide-semiconductor S
3with the 4th metal-oxide-semiconductor S
4; First input end mouth P-E accesses storage battery, second input port E-Q accesses photovoltaic cell, battery positive voltage access electrode points P, battery terminal negative access electrode points E, photovoltaic cell positive pole access electrode points E, photovoltaic cell negative pole access electrode points Q, is connected in series the first filter capacitor C between electrode points P with electrode points E
1, between electrode points E and electrode points Q, be serially connected with the second filter capacitor C
2, between electrode points P and electrode points A, be connected in series the first metal-oxide-semiconductor S
1, between electrode points A and electrode points Q, be connected in series the second metal-oxide-semiconductor S
2, between electrode points P and electrode points B, be connected in series the 3rd metal-oxide-semiconductor S
3, between electrode points B and electrode points Q, be connected in series the 4th metal-oxide-semiconductor S
4, between electrode points A and electrode points E, be serially connected with the first inductance L
1;
Half-bridge full-controlled rectifier device comprises input port C-D, output port M-N, the 5th IGBT pipe S
5, the 6th IGBT pipe S
6, the 3rd filter capacitor C
3and the 4th filter capacitor C
4, between electrode points M and electrode points C, be connected in series the 5th IGBT pipe S
5, between electrode points C and electrode points N, be connected in series the 6th IGBT pipe S
6, serial capacitance C between electrode points M and electrode points D
3, serial capacitance C between electrode points D and electrode points N
4;
Electrode points A connects leakage inductance L
rbe connected to electrode points B afterwards on the former limit of high frequency transformer, on the secondary connecting electrode point C and electrode points D of high frequency transformer;
Described electric capacity of voltage regulation C
5be serially connected between electrode points M and electrode points N;
Described control circuit comprises output and is connected to battery tension sample circuit, battery current sample circuit, photovoltaic cell voltage sampling circuit, photovoltaic cell current sampling circuit, full-bridge inverter current sampling circuit, output voltage sampling circuit on digital signal processor, and the signal output part of described digital signal processor is connected with the first metal-oxide-semiconductor drive circuit, the second metal-oxide-semiconductor drive circuit, the 3rd metal-oxide-semiconductor drive circuit, the 4th metal-oxide-semiconductor drive circuit, the 5th IGBT tube drive circuit, the 6th IGBT tube drive circuit.
2. three-port DC converter device according to claim 1, it is characterized in that, the input of described photovoltaic cell voltage sampling circuit is connected on main circuit photovoltaic cell input positive pole, the output of photovoltaic cell voltage sampling circuit is connected on digital signal processor, voltage signal by bleeder circuit dividing potential drop, then exports to digital signal processor after filter capacitor filtering; Described battery tension sample circuit is identical with photovoltaic cell voltage sampling circuit.
3. three-port DC converter device according to claim 1 and 2, it is characterized in that, the input of described battery current sample circuit is serially connected between main circuit storage battery input positive pole and storage battery, the output of described battery current sample circuit is connected on digital signal processor, current signal carries out filtering again through current sensor sampling after dividing potential drop, and filtered signal gives digital signal processor; Described photovoltaic cell current sampling circuit is identical with battery current sample circuit with full-bridge inverter current sampling circuit.
4. three-port DC converter device according to claim 1 and 2, it is characterized in that, the input of described output voltage sampling circuit is connected on main circuit electrode points M and electrode points N, the output of described output voltage sampling circuit is connected on digital signal processor, voltage signal is converted into electric current through sampling resistor, amplified after the conversion of Hall voltage transmitter, be converted into corresponding voltage through low-pressure side sampling resistor, then export to digital signal processor through low pass filter.
5. three-port DC converter device according to claim 1 and 2, is characterized in that, described digital signal processor adopts dsPIC33FJ64GS606 chip.
6. a three-port DC converter device hybrid modulation method, is characterized in that, by the first metal-oxide-semiconductor S
1with the second metal-oxide-semiconductor S
2drive singal be set to complementation, calculate the first metal-oxide-semiconductor S by maximum power tracing algorithm
1duty ratio, make the 3rd metal-oxide-semiconductor S
3with the 4th metal-oxide-semiconductor S
4complementary and the 3rd metal-oxide-semiconductor S of drive singal
3duty ratio and the first metal-oxide-semiconductor S
1identical, keep the first metal-oxide-semiconductor S
1with the 3rd metal-oxide-semiconductor S
3between phase shifting angle be 180 °, make the 5th IGBT pipe S
5with the 6th IGBT pipe S
6drive singal complementary and duty ratio is 0.5, keep the first metal-oxide-semiconductor S
1with the 5th IGBT pipe S
5rising edge between keep certain phase shifting angle φ, and phase shifting angle φ meet
, wherein
=
,
=
, δ is the first metal-oxide-semiconductor S
1the high level mid point of drive singal and the 5th metal-oxide-semiconductor S
5phase shifting angle between the high level mid point of drive singal,
be the first metal-oxide-semiconductor S
1duty ratio,
be the 5th IGBT pipe S
5duty ratio.
7. a three-port DC converter device closed loop control method, is characterized in that, by regulating the duty ratio of former limit dual input inverter, realizes the input maximum power tracing of photovoltaic and the function of dual input inversion simultaneously; By sampling to secondary half-bridge full-controlled rectifier device output voltage, compare with output voltage desired value after doing difference and give voltage controller, the output of voltage controller is given duty ratio/phase shifting angle modulator and is modulated, the phase shifting angle of half-bridge full-controlled rectifier device square-wave modulation signal relative to former limit square-wave modulation signal is obtained after modulation, phase shifting angle scope is set to-90 ° ~ 90 °, by regulating phase shifting angle to control output voltage and power flow direction, two-wayly can transmitted power size can to control via voltage close loop output valve amplitude limit.
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