CN113890356B - Novel high-gain double-input DC-DC converter - Google Patents
Novel high-gain double-input DC-DC converter Download PDFInfo
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- CN113890356B CN113890356B CN202111062587.5A CN202111062587A CN113890356B CN 113890356 B CN113890356 B CN 113890356B CN 202111062587 A CN202111062587 A CN 202111062587A CN 113890356 B CN113890356 B CN 113890356B
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- 239000003990 capacitor Substances 0.000 claims abstract description 117
- 238000004146 energy storage Methods 0.000 claims description 23
- 238000010248 power generation Methods 0.000 claims description 16
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- 230000009977 dual effect Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 10
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000004088 simulation Methods 0.000 description 3
- 238000003915 air pollution Methods 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 230000010354 integration Effects 0.000 description 1
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Classifications
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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
- H02M3/158—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 including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
-
- 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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
-
- 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
-
- 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)
- Dc-Dc Converters (AREA)
Abstract
A novel high-gain dual-input DC-DC converter comprises an input unit, a first boost unit, a second boost unit and a load unit, wherein the input unit comprises three inductors L 1 、L 3 、L 4 Four capacitors C 3 、C 5 、C 7 、C 8 Three power switch tubes S 1 、S 2 、S 3 Four diodes D 1 、D 2 、D 3 、D 4 The method comprises the steps of carrying out a first treatment on the surface of the The first boost unit comprises an inductor L 2 A capacitor C 4 And a diode D 5 The second boost unit comprises an inductor L 5 A capacitor C 6 And a diode D 6 . Compared with the existing scheme, the converter can obviously reduce the frequency of electric energy conversion among a micro power supply, a storage battery and a load, improve the electric energy conversion efficiency, has the advantages of wide input and output voltage regulation range, low voltage stress of a switching device and the like, and can realize N-way boosting expansion.
Description
Technical Field
The invention relates to a DC-DC converter, in particular to a novel high-gain double-input DC-DC converter.
Background
With the increasing severity of global problems such as energy crisis, greenhouse effect, air pollution and the like, new energy power generation technologies such as photovoltaic power generation, fuel cell power generation and the like are widely focused and rapidly developed, and the new energy power generation system containing the energy storage unit can smooth the power generation output of the new energy micro power supply and improve the power supply stability of the system.
In a conventional hybrid multi-port converter scheme, a new energy micro-power supply and an energy storage unit are typically connected in parallel with a DC bus through respective DC/DC converters. Although the structure can solve the problems of balancing the micro-power generation output of the energy storage unit and improving the power supply stability of the system, the parallel structure can also increase the design cost of the system and the design complexity of the controller because the parallel structure of the DC/DC converter and the DC bus is adopted to ensure that the energy storage system needs to perform electric energy conversion twice when charged and discharged each time, thereby causing the problems of electric energy waste, low electric energy utilization rate and the like.
In addition, most of the current multiport converters are based on the traditional Boost converter, and high gain can be rarely realized, and the high gain realized by using the coupling inductor causes larger voltage and current stress of the power switch tube due to leakage inductance. Therefore, the improvement of the existing parallel structure has important significance for reducing the energy conversion times of the energy storage system, improving the energy utilization rate of the system, reducing the design cost of the system, optimizing the design of the controller and realizing the high gain and the low stress of the power switch tube.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the problems of more energy conversion times, low energy utilization rate, improvement of input and output voltage gain and the like caused by the parallel structure of the energy storage units. The novel high-gain double-input DC-DC converter is provided, the integration of the multi-port DC/DC converter and the high-gain DC/DC converter is realized, the generation redundancy of the new energy micro-power supply can be directly stored through the storage battery energy storage unit, and the storage battery can release the stored electric energy for load use when the generation power of the photovoltaic battery is insufficient. Compared with the existing scheme, the converter can remarkably reduce the frequency of electric energy conversion among the micro power supply, the storage battery and the load, and improves the electric energy conversion efficiency; and meanwhile, 2N-way boosting expansion can be realized.
The technical scheme adopted by the invention is as follows:
a novel high gain dual input DC-DC converter, the converter comprising:
the device comprises an input unit, a first boosting unit, a second boosting unit and a load unit;
the input unit includes: inductance L 1 、L 3 、L 4 Capacitance C 3 、C 5 、C 7 、C 8 Power switch tube S 1 、S 2 、S 3 Diode D 1 、D 2 、D 3 、D 4 ；
Diode D 1 The anode is connected with the anode of the PV module and the diode D 1 The cathodes are respectively connected with an inductance L 1 One end, power switch tube S 2 A source electrode; inductance L 1 One end is respectively connected with a power switch tube S 1 Drain, power switch tube S 3 Drain electrode, capacitor C 3 One end; capacitor C 3 The other end is connected with an inductor L 3 One end of diode D 2 Anode, diode D 2 Cathode connection capacitor C 7 One end;
capacitor C 7 The other ends are respectively connected with a capacitor C 8 One end, inductance L 3 Another end, diode D 4 Cathode, power switch tube S 1 A source, a PV module cathode;
power switch tube S 2 The drain electrodes are respectively connected with the anode and the diode D of the energy storage unit 3 Cathode, energy storage unit negative pole connects PV module negative pole, diode D 3 Anode connection power switch tube S 3 Source electrode, power switch tube S 3 Drain electrode connection capacitor C 5 One end of the capacitor C 5 The other ends are respectively connected with a diode D 4 Anode, inductance L 4 One end of the inductor L 4 The other end is connected with a capacitor C 8 The other end;
the first boost unit B includes: inductance L 2 Capacitance C 4 Capacitance C 1 Diode D 5 ；
Capacitor C 4 One end is connected with a capacitor C 3 Another end, capacitor C 4 The other end is connected with an inductor L 2 One end of diode D 5 Anode, diode D 5 Cathode connection capacitor C 1 Is one end of the inductance L 2 The other end is connected with a capacitor C 7 One end;
the second boosting unit C includes: inductance L 5 Capacitance C 6 Capacitance C 2 Diode D 6 ；
Diode D 6 Cathode connection capacitor C 8 Another end, diode D 6 The anodes are respectively connected with a capacitor C 6 Another end, inductance L 5 One end of the inductor L 5 The other end is connected with a capacitor C 2 One end of the capacitor C 6 One end is connected with a capacitor C 5 The other end;
the conventional SEPIC and Cuk converters are respectively added with switches S2 and S3 and a diode D 3 A bidirectional power flow port is formed. Therefore, three-port converters of two unipolar direct-current micro-grids are constructed and combined into an input unit a through device multiplexing. When one input end fails, the other input end can work normally.
Capacitor C in1 、C in2 Is connected in parallel to the PV module and the energy storage unit to reduce photovoltaic voltage ripple and battery charge-discharge current ripple.
Diode D 1 Preventing reverse flow to the photovoltaic module. V (V) pv For the voltage of the PV module, V b The voltage of the energy storage equipment connected with the bidirectional port meets the requirement of V b ＞V pv 。
Input unit A, S 2 For battery discharge branch switch S 3 And D 3 Is a battery discharge branch. When the photovoltaic cell generates electricity with redundancy, V pv Through diode D 1 Inductance L 1 Switch S 3 And diode D 3 Charging the accumulator, at this time the power switch tube S 3 Conduction, S 1 And S is 2 And (5) switching off. When the photovoltaic battery is insufficient in power generation or the load power is high, the storage battery passes through the power switch tube S 2 Inductance L 1 And power switchTube S 1 Give electric capacity C 1 And C 2 Charging and supplying power to the load at the same time, and at the moment, the power switch tube S 1 、S 2 Conduction, S 3 And (5) switching off.
The converter works in three different states, namely:
(1) Single input dual output state: when the photovoltaic cell power generation is redundant, the photovoltaic power generation simultaneously supplies power to the load and the storage battery. In SIDO mode, switch S 2 Always closed. Switch S 1 、S 3 Adopts an interleaving control mode, and a power switch tube S 3 Control the charging voltage of the accumulator, power switch tube S 3 At S only 1 On when off, and S 1 、S 3 The sum of the duty cycles of (2) is less than 1. The cells absorb the excess energy of the PV module as output, corresponding to a boost converter from the PV port to the cell port, so V b ＞V pv It is necessary.
(2) Dual input single output state: when the load power requirement is larger than the generated energy of the photovoltaic cell, the photovoltaic cell and the storage battery supply power to the load simultaneously. In the DISO mode, the photovoltaic module and the battery are used as input power sources of a dc load, and the switch S 3 And diode D 3 Always closed. Power switch tube S 1 、S 2 Adopts an interleaving control mode, and S 1 、S 2 The sum of the duty cycles of (2) is less than 1. And V is b ＞V pv Must be satisfied to ensure that when the switch S 2 Diode D when it is closed 1 Is reverse cut-off.
(3) Single input single output state: when the photovoltaic cell cannot generate electricity, the storage battery independently supplies power to the load, and S is in SISO mode 3 The switch is kept off, S 2 The switch remains closed; when the storage battery cannot generate electricity, the photovoltaic battery independently supplies power to the load, and in the SISO mode, S 2 And S is 3 The switch is kept off, S 1 The switch controls the output voltage.
The novel high-gain double-input DC-DC converter has the following beneficial effects:
1) According to the invention, through improving the structures of the traditional Sepic and Cuk converters, the connection of the energy storage unit is realized, and the photovoltaic power generation, the battery charge and discharge and the high-gain output are realized by only comprising three switches. The switching of a plurality of working states of SIDO, DISO, SIS0 can be realized simultaneously, one-time electric energy conversion is realized among all ports, the energy conversion times are reduced, and the energy utilization rate is improved.
2) The novel high-gain double-input DC/DC converter provided by the invention has the advantages that the port voltage limit is loose, the load voltage level can be flexibly set, and the application range of the novel high-gain double-input DC/DC converter is greatly expanded. In addition, the efficiency of the converter is greatly improved due to the single stage power conversion between the power source and the load. The diode capacitor boosting unit is used for simultaneously realizing high gain of input and output voltage, and reducing the voltage and current stress of the main power switch tube.
Drawings
Fig. 1 is a schematic diagram of a novel high gain dual input DC-DC converter of the present invention.
Fig. 2 is a schematic diagram of a novel 2N-way boost expansion of a high-gain dual-input DC-DC converter according to the present invention.
FIG. 3 (a) shows the input voltage V under the SISO condition of the photovoltaic panel of the present invention pv 40, an inductance current waveform diagram when the number of the boosting units is 1;
FIG. 3 (b) shows the input voltage V under the SISO condition of the photovoltaic panel of the present invention pv 40, a waveform chart of capacitor voltage and output voltage when the number of the boosting units is 1;
FIG. 3 (c) shows the input voltage V under the SISO condition of the photovoltaic panel of the present invention pv 40, a power switch tube voltage waveform diagram when the number of the boosting units is 1;
FIG. 3 (d) shows the input voltage V under the SISO condition of the photovoltaic panel of the present invention pv 40, the power switch tube input signal and input voltage waveform chart when the number of the boosting units is 1.
FIG. 4 (a) shows the input voltage V under the SISO condition of the storage battery pv 50, an inductance current waveform diagram when the number of the boosting units is 1;
FIG. 4 (b) shows the input voltage V under the SISO condition of the storage battery pv 50, capacitor voltage and output voltage wave when the number of the boosting units is 1A shape drawing;
FIG. 4 (c) shows the input voltage V under the SISO condition of the storage battery pv 50, a power switch tube voltage waveform diagram when the number of the boosting units is 1;
FIG. 4 (d) shows the input voltage V under the SISO condition of the storage battery pv 50, a power switch tube input signal and input voltage waveform chart when the number of the boosting units is 1.
FIG. 5 (a) shows the input voltage V under DISO conditions pv 40, battery voltage V b 50, an inductance current waveform diagram when the number of the boosting units is 1;
FIG. 5 (b) shows the input voltage V under DISO conditions pv 40, battery voltage V b 50, a waveform diagram of capacitor voltage and output voltage when the number of the boosting units is 1;
FIG. 5 (c) shows the input voltage V under DISO conditions pv 40, battery voltage V b 50, a power switch tube voltage waveform diagram when the number of the boosting units is 1;
FIG. 5 (d) shows the input voltage V under DISO conditions pv 40, battery voltage V b 50, a power switch tube input signal and input voltage waveform chart when the number of the boosting units is 1.
FIG. 6 (a) shows the input voltage V under SIDO conditions pv 40, an inductance current waveform diagram when the number of the boosting units is 1;
FIG. 6 (b) shows the input voltage V under SIDO conditions pv 40, a waveform chart of capacitor voltage and output voltage when the number of the boosting units is 1;
FIG. 6 (c) shows the input voltage V under SIDO conditions pv 40, a power switch tube voltage waveform diagram when the number of the boosting units is 1;
FIG. 6 (d) shows the input voltage V under SIDO conditions pv 40, the power switch tube input signal and input voltage waveform chart when the number of the boosting units is 1.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, a novel high-gain dual-input DC-DC converter is composed of an input unit a, boost units B and C, and a load unit D, and the internal connection relationships are as follows:
the input unit comprises a basic Sepic circuit and a basic Cuk circuit, and comprises three inductors L 1 、L 3 、L 4 Four capacitors C 3 、C 5 、C 7 、C 8 Three power switch tubes S 1 、S 2 、S 3 Four diodes D 1 、D 2 、D 3 、D 4 The method comprises the steps of carrying out a first treatment on the surface of the The connection form is as follows: diode D 1 Is connected with the anode of the photovoltaic input and the cathode is connected with the inductor L 1 And pass through the power switch tube S 2 Connected to the positive pole of the energy storage unit, inductance L 1 The other end of (2) passes through a power switch tube S 1 A negative electrode connected to the photovoltaic input, a capacitor C 3 And L is at one end of 1 And S at the other end of (2) 3 Connected with capacitor C 3 Is connected to L at the other end 3 And diode D 2 Anode of D 2 Cathode connection C of (2) 7 To the negative pole of the photovoltaic input, L 3 And diode D 4 Is connected with the cathode of C 8 And C is at one end of (2) 7 Is connected to the other end of diode D 4 Anode and L of (2) 4 And C is at one end of (2) 5 Is connected to the other end of diode D 3 Anode and S of (2) 3 The cathode is connected to the positive electrode of the energy storage unit;
the boost unit B comprises an inductor L 2 A capacitor C 4 A capacitor C 1 And a diode D 5 The boost unit C comprises an inductor L 5 A capacitor C 6 A capacitor C 2 And a diode D 6 The method comprises the steps of carrying out a first treatment on the surface of the The connection form is as follows: capacitor C in boost unit B 4 And diode D 2 Anode of (C) is connected to capacitor C 4 And the other end of (2) is connected with inductance L 2 And diode D 5 Is connected with the anode of diode D 5 Is connected with a load; capacitor C in boost unit C 6 One of (2)Terminal and inductance L 4 Is connected to one end of capacitor C 6 And the other end of (2) is connected with inductance L 5 And diode D 6 Anode of (C) is connected with inductance L 5 The other end of the (B) is connected with a load;
input unit A, S 2 For battery discharge branch switch S 3 And D 3 Is a battery discharge branch. When the photovoltaic cell generates electricity with redundancy, V pv Through diode D 1 Inductance L 1 Switch S 3 And diode D 3 Charging the accumulator, at this time the power switch tube S 3 Conduction, S 1 And S is 2 And (5) switching off. When the photovoltaic battery is insufficient in power generation or the load power is high, the storage battery passes through the power switch tube S 2 Inductance L 1 And a power switch tube S 1 Give electric capacity C 1 And C 2 Charging and supplying power to the load at the same time, and at the moment, the power switch tube S 1 、S 2 Conduction, S 3 And (5) switching off.
The converter works in three different states, namely:
(1) Single input dual output state: when the photovoltaic cell power generation is redundant, the photovoltaic power generation simultaneously supplies power to the load and the storage battery. In SIDO mode, switch S 2 Always closed. Switch S 1 、S 3 Adopts an interleaving control mode, and a power switch tube S 3 Control the charging voltage of the accumulator, power switch tube S 3 At S only 1 On when off, and S 1 、S 3 The sum of the duty cycles of (2) is less than 1. The cells absorb the excess energy of the PV module as output, corresponding to a boost converter from the PV port to the cell port, so V b ＞V pv It is necessary.
(2) Dual input single output state: when the load power requirement is larger than the generated energy of the photovoltaic cell, the photovoltaic cell and the storage battery supply power to the load simultaneously. In the DISO mode, the photovoltaic module and the battery are used as input power sources of a dc load, and the switch S 3 And diode D 3 Always closed. Power switch tube S 1 、S 2 Adopts an interleaving control mode, and S 1 、S 2 The sum of the duty cycles of (2) is less than 1. And V is b ＞V pv Must be satisfied to ensure that when the switch S 2 Diode D when it is closed 1 Is reverse cut-off.
(3) Single input single output state: when the photovoltaic cell cannot generate electricity, the storage battery independently supplies power to the load, and S is in SISO mode 3 The switch is kept off, S 2 The switch remains closed; when the storage battery cannot generate electricity, the photovoltaic battery independently supplies power to the load, and in the SISO mode, S 2 And S is 3 The switch is kept off, S 1 The switch controls the output voltage.
From FIG. 3 (a), it can be seen that the inductance L is under the SISO condition of the photovoltaic cell 1 、L 2 、L 3 、L 4 、L 5 The current is continuous, and fig. 3 (b) to 3 (C) show the capacitance C 3 、C 4 、C 5 、C 6 And a power switch tube S 1 、S 2 、S 3 The voltage stress experienced is low and fig. 3 (d) shows how the panel voltage and the drive between the individual power switching tubes is controlled. Obviously, the simulation results are consistent with the previous theoretical analysis.
From fig. 4 (a), it can be seen that the inductance L is under the SISO operating condition of the battery 1 、L 2 、L 3 、L 4 、L 5 The current is continuous, and fig. 4 (b) to 4 (C) show the capacitance C 3 、C 4 、C 5 、C 6 And a power switch tube S 1 、S 2 、S 3 The voltage stress experienced is low and fig. 4 (d) shows how the battery voltage and the drive between the individual power switching transistors is controlled. Obviously, the simulation results are consistent with the previous theoretical analysis.
From FIG. 5 (a), it can be seen that the inductance L is under DISO conditions 1 、L 2 、L 3 、L 4 、L 5 The current is continuous, and fig. 5 (b) to 5 (C) show the capacitance C 3 、C 4 、C 5 、C 6 And a power switch tube S 1 、S 2 、S 3 The voltage stress experienced is low and fig. 5 (d) shows how the panel voltage of the photovoltaic cell, the battery voltage and the drive between the individual power switching tubes are controlled. Obviously, simulationThe results are consistent with previous theoretical analysis.
From FIG. 6 (a), it can be seen that the inductance L is under SIDO conditions 1 、L 2 、L 3 、L 4 、L 5 The current is continuous, and fig. 6 (b) to 6 (C) show the capacitance C 3 、C 4 、C 5 、C 6 And a power switch tube S 1 、S 2 、S 3 The voltage stress experienced is low and fig. 6 (d) shows how the photovoltaic panel voltage, battery charging current and drive between individual power switching tubes are controlled. Obviously, the simulation results are consistent with the previous theoretical analysis.
The invention can realize N-path boost expansion at the same time, as shown in figure 2:
a novel high gain dual input DC-DC converter, the converter comprising:
an input unit A, N first boosting units B, N second boosting units C and a load unit D;
the input unit a includes: inductance L 1 、L 3 、L 4 Capacitance C 3 、C 5 、C 7 、C 8 Power switch tube S 1 、S 2 、S 3 Diode D 1 、D 2 、D 3 、D 4 ；
Diode D 1 The anode is connected with the anode of the PV module and the diode D 1 The cathodes are respectively connected with an inductance L 1 One end, power switch tube S 2 A source electrode; inductance L 1 One end is respectively connected with a power switch tube S 1 Drain, power switch tube S 3 Drain electrode, capacitor C 3 One end; capacitor C 3 The other end is connected with an inductor L 3 One end of diode D 2 Anode, diode D 2 Cathode connection capacitor C 7 One end;
capacitor C 7 The other ends are respectively connected with a capacitor C 8 One end, inductance L 3 Another end, diode D 4 Cathode, power switch tube S 1 A source, a PV module cathode;
power switch tube S 2 The drain electrodes are respectively connected with the anode and the diode of the energy storage unitD 3 Cathode, energy storage unit negative pole connects PV module negative pole, diode D 3 Anode connection power switch tube S 3 Source electrode, power switch tube S 3 Drain electrode connection capacitor C 5 One end of the capacitor C 5 The other ends are respectively connected with a diode D 4 Anode, inductance L 4 One end of the inductor L 4 The other end is connected with a capacitor C 8 The other end;
the first boost unit B includes N boost modules:
the 1 st step-up module comprises an inductor L 21 A capacitor C 41 A capacitor C 11 One diode D 51 ；
The 2 nd step-up module comprises an inductor L 22 A capacitor C 42 A capacitor C 12 One diode D 52 ；
The 3 rd step-up module includes an inductor L 23 A capacitor C 43 A capacitor C 13 One diode D 53 ；
...
The Nth step-up module includes an inductor L 2N A capacitor C 4N A capacitor C 1N One diode D 5N ；
The connection relationship is as follows:
capacitor C 41 One end is connected with a capacitor C in the input unit A 3 Another end, capacitor C 41 The other end is connected with an inductor L 21 One end of diode D 51 Anode, diode D 51 Cathode connection capacitor C 11 One end of the inductor L 21 The other end is connected with a diode D in the input unit (A) 2 A cathode;
between the N boost modules:
capacitor C in the 2 nd boost module 42 One end is connected with the capacitor C in the 1 st boost module 41 Another end, capacitor C 42 The other ends are respectively connected with a diode D 52 Anode, inductance L 22 One end of diode D 52 Cathode connection capacitor C 12 One end of the inductor L 22 The other end is connected with a diode D in the 1 st step-up module 51 A cathode;
capacitor C in the 3 rd boost module 43 One end is connected with a capacitor C in the 2 nd step-up module 42 Another end, capacitor C 43 The other ends are respectively connected with a diode D 53 Anode, inductance L 23 One end of diode D 53 Cathode connection capacitor C 13 One end of the inductor L 23 The other end is connected with a diode D in the 2 nd step-up module 52 A cathode;
...
Capacitor C in the Nth boost module 4N One end is connected with a capacitor C in the N-1 boost module 4(N-1) Another end, capacitor C 4N The other ends are respectively connected with a diode D 5N Anode, inductance L 2N One end of diode D 5N Cathode connection capacitor C 1N One end of the inductor L 2N The other end is connected with a diode D in the N-1 boost module 5(N-1) A cathode;
the second boosting unit C includes N boosting sections:
the 1 st step-up section includes an inductor L 51 A capacitor C 61 A capacitor C 21 One diode D 61 ；
The 2 nd step-up section includes an inductor L 52 A capacitor C 62 A capacitor C 22 One diode D 62 ；
...
The Nth step-up section includes an inductor L 5N A capacitor C 6N A capacitor C 2N One diode D 6N ；
The connection relationship is as follows:
capacitor C 61 One end is connected with a capacitor C in the input unit (A) 5 Another end, capacitor C 61 The other end is connected with an inductor L 51 One end of diode D 61 Anode, diode D 61 Cathode connection capacitor C 8 One end of the inductor L 51 The other end is connected with a capacitor C 21 One end;
between the N boost sections:
capacitor C in the 2 nd boost module 62 One end is connected with the capacitor C in the 1 st boost module 61 Another end, capacitor C 62 The other end is connected with an inductor L 52 One end of diode D 62 Anode, diode D 62 Cathode connection capacitor C 21 One end of the inductor L 52 The other end is connected with a capacitor C 22 One end;
capacitor C in the 3 rd boost module 63 One end is connected with a capacitor C in the 2 nd step-up module 62 Another end, capacitor C 63 The other end is connected with an inductor L 53 One end of diode D 63 Anode, diode D 63 Cathode connection capacitor C 22 One end of the inductor L 53 The other end is connected with a capacitor C 23 One end;
.. analogize to;
capacitor C in the Nth boost module 6N One end is connected with a capacitor C in the N-1 boost module 6(N-1) Another end, capacitor C 6N The other end is connected with an inductor L 5N One end of diode D 6N Anode, diode D 6N Cathode connection capacitor C 2(N-1) One end of the inductor L 5N The other end is connected with a capacitor C 2N One end;
load R L One end is connected with a capacitor C in the Nth boosting module 1N One end of the load R L The other end is connected with the capacitor C in the N-th boosting part 2N And the other end.
In summary, the novel high-gain dual-input DC-DC converter provided by the invention realizes the connection of the energy storage unit, the coordination work between the energy storage unit and the photovoltaic cell and the high gain of output voltage. The integrated multiport DC/DC converter solves the problems of low energy utilization rate, high design and the like of the traditional parallel structure, realizes high input and output gain through the diode capacitance inductance multiplication unit, and reduces voltage and current stress on the main power switch tube. The invention is suitable for the new energy power generation system with the energy storage unit, the above embodiment example is only a multi-working-mode high-gain DC/DC converter which is constructed for simple explanation of the working principle, and in practical application, the scheme can be slightly improved according to practical conditions, so as to achieve the purposes of optimizing efficiency and saving cost.
Claims (3)
1. A novel high gain dual input DC-DC converter, the converter comprising:
an input unit (A), a first boosting unit (B), a second boosting unit (C), and a load unit (D);
the input unit (A) includes: inductance L 1 、L 3 、L 4 Capacitance C 3 、C 5 、C 7 、C 8 Power switch tube S 1 、S 2 、S 3 Diode D 1 、D 2 、D 3 、D 4 ；
Diode D 1 The anode is connected with the anode of the PV module and the diode D 1 The cathodes are respectively connected with an inductance L 1 One end, power switch tube S 2 A source electrode; inductance L 1 One end is respectively connected with a power switch tube S 1 Drain, power switch tube S 3 Drain electrode, capacitor C 3 One end; capacitor C 3 The other end is connected with an inductor L 3 One end of diode D 2 Anode, diode D 2 Cathode connection capacitor C 7 One end;
capacitor C 7 The other ends are respectively connected with a capacitor C 8 One end, inductance L 3 Another end, diode D 4 Cathode, power switch tube S 1 A source, a PV module cathode;
power switch tube S 2 The drain electrodes are respectively connected with the anode and the diode D of the energy storage unit 3 Cathode, energy storage unit negative pole connects PV module negative pole, diode D 3 Anode connection power switch tube S 3 Source electrode, power switch tube S 3 Drain electrode connection capacitor C 5 One end of the capacitor C 5 The other ends are respectively connected with a diode D 4 Anode, inductance L 4 One end of the inductor L 4 The other end is connected with a capacitor C 8 The other end;
the first boosting unit (B) includes: inductance L 2 Capacitance C 4 Capacitance C 1 Diode D 5 ；
Capacitor C 4 One end is connected with a capacitor C 3 Another end, capacitor C 4 The other end is connected with an inductor L 2 One end of diode D 5 Anode, diode D 5 Cathode connection capacitor C 1 Is one end of the inductance L 2 The other end is connected with a capacitor C 7 One end;
the second boosting unit (C) includes: inductance L 5 Capacitance C 6 Capacitance C 2 Diode D 6 ；
Diode D 6 Cathode connection capacitor C 8 Another end, diode D 6 The anodes are respectively connected with a capacitor C 6 Another end, inductance L 5 One end of the inductor L 5 The other end is connected with a capacitor C 2 One end of the capacitor C 6 One end is connected with a capacitor C 5 The other end;
diode D 1 Preventing current from flowing in the photovoltaic module in the reverse direction; v (V) pv For the voltage of the PV module, V b The voltage of the energy storage equipment connected with the bidirectional port meets the requirement of V b ＞V pv ；
In the input unit (A), S 2 For battery discharge branch switch S 3 And D 3 A discharge branch for the battery; when the photovoltaic cell generates electricity with redundancy, V pv Through diode D 1 Inductance L 1 Power switch tube S 3 And diode D 3 Charging the accumulator, at this time the power switch tube S 3 Conduction and power switch tube S 1 And S is 2 Turning off; when the photovoltaic battery is insufficient in power generation or the load power is high, the storage battery passes through the power switch tube S 2 Inductance L 1 And a power switch tube S 1 Give electric capacity C 1 And C 2 Charging and supplying power to the load at the same time, and at the moment, the power switch tube S 1 、S 2 Conduction and power switch tube S 3 Turning off;
the converter works in three different states, namely:
(1) Single input dual output state: when there is redundancy in the generation of electricity by the photovoltaic cells,photovoltaic power generation supplies power to a load and a storage battery at the same time; in SIDO mode, power switch S 2 Always off; power switch tube S 1 、S 3 Adopts an interleaving control mode, and a power switch tube S 3 Control the charging voltage of the accumulator, power switch tube S 3 At S only 1 On when off, and power switch tube S 1 、S 3 The sum of the duty cycles of (2) is less than 1; the cells absorb the excess energy of the PV module as output, corresponding to a boost converter from the PV port to the cell port, so V b ＞V pv It is necessary;
(2) Dual input single output state: when the load power requirement is larger than the generated energy of the photovoltaic cell, the photovoltaic cell and the storage battery supply power to the load simultaneously; in the DISO mode, the photovoltaic module and the battery are used as an input power supply of a direct current load, and the power switch tube S 3 And diode D 3 Always closed; power switch tube S 1 、S 2 Adopts an interleaving control mode and a power switch tube S 1 、S 2 The sum of the duty cycles of (2) is less than 1; and V is b ＞V pv Must be satisfied to ensure that when the power switch tube S 2 Diode D when it is closed 1 Is reverse cut-off;
(3) Single input single output state: when the photovoltaic cell cannot generate electricity, the storage battery independently supplies power to the load, and in the SISO mode, the power switch tube S 3 Keep off, power switch tube S 2 Keep closed; when the storage battery can not generate electricity, the photovoltaic battery independently supplies power to the load, and in the SISO mode, the power switch tube S 2 And S is 3 Keep off, power switch tube S 1 The output voltage is controlled.
2. The novel high-gain dual-input DC-DC converter of claim 1, wherein: by power switching tubes S2, S3 and diode D 3 A bidirectional power flow port is formed; and constructing three-port converters of two unipolar direct current micro-grids, and combining the three-port converters into an input unit (A) through device multiplexing, wherein when one input end fails, the other input end can work normally.
3. The novel high-gain dual-input DC-DC converter of claim 1, wherein: capacitor C in1 、C in2 Are respectively connected in parallel to the PV module and the energy storage unit.
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| WO2014123173A1 (en) * | 2013-02-08 | 2014-08-14 | 株式会社村田製作所 | Dc-dc converter |
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