CN113890356A - Novel high-gain dual-input DC-DC converter - Google Patents

Novel high-gain dual-input DC-DC converter Download PDF

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Publication number
CN113890356A
CN113890356A CN202111062587.5A CN202111062587A CN113890356A CN 113890356 A CN113890356 A CN 113890356A CN 202111062587 A CN202111062587 A CN 202111062587A CN 113890356 A CN113890356 A CN 113890356A
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China
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capacitor
diode
inductor
terminal
boosting
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CN202111062587.5A
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CN113890356B (en
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邾玢鑫
戴俊平
支树播
赵宇辉
李振华
杨楠
王凯宏
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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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
    • 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

Abstract

A novel high-gain dual-input DC-DC converter comprises an input unit, a first boosting unit, a second boosting unit and a load unit, wherein the input unit comprises three inductors L1、L3、L4Four capacitors C3、C5、C7、C8Three power switches S1、S2、S3Four diodes D1、D2、D3、D4(ii) a The first voltage boosting unit comprisesAn inductor L2A capacitor C4And a diode D5The second boosting unit comprises an inductor L5A capacitor C6And a diode D6. Compared with the existing scheme, the converter can obviously reduce the electric energy conversion times among the micro power supply, the storage battery and the load, improves 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-path boosting expansion.

Description

Novel high-gain dual-input DC-DC converter
Technical Field
The invention relates to a DC-DC converter, in particular to a novel high-gain dual-input DC-DC converter.
Background
With the increasing severity of global problems such as energy crisis, greenhouse effect and atmospheric pollution, new energy power generation technologies such as photovoltaic power generation and fuel cell power generation are widely concerned and rapidly developed, and a new energy power generation system comprising an energy storage unit can smooth the power generation output of a 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 source and an energy storage unit are generally connected in parallel with a direct current bus through respective DC/DC converters. Although the structure can solve the problems of the balance micro-power supply generated output of the energy storage unit and the improvement of the power supply stability of the system, the problems of electric energy waste, low electric energy utilization rate and the like are caused because the respective DC/DC converter and direct current bus parallel structure are adopted to ensure that the energy storage system needs to perform two times of electric energy conversion when charging and discharging electricity at each time, and the parallel structure can also increase the design cost of the system and the complexity of the design of the controller.
In addition, most of the conventional multi-port converters are based on the conventional Boost converter variable structure, high gain can be rarely realized, and the high gain realized by using the coupling inductor has larger voltage and current stress of a switching 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 high gain and low stress of the switch tube.
Disclosure of Invention
Aiming at the defects of the prior art, the invention mainly solves 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 power generation redundancy of a 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 practicality when the power generation power of the photovoltaic battery is insufficient. Compared with the existing scheme, the converter can obviously reduce the times of electric energy conversion among the micro power supply, the storage battery and the load, and improve the electric energy conversion efficiency; and meanwhile, the 2N-path 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 input unit, the first boost unit, the second boost unit and the load unit;
the input unit includes: inductor L1、L3、L4Capacitor C3、C5、C7、C8Power switch S1、S2、S3Diode D1、D2、D3、D4；
Diode D1Anode connected to the positive pole of PV module, diode D1The cathodes are respectively connected with an inductor L1One terminal, power switch S2A source electrode; inductor L1One end is respectively connected with a power switch S1Drain electrode, power switch S3Drain electrode, capacitor C3One end; capacitor C3The other ends are respectively connected with an inductor L3One terminal, diode D2Anode, diode D2Cathode connection capacitor C7One end;
capacitor C7The other end is divided intoRespectively connected with a capacitor C8One terminal, inductor L3Another terminal, diode D4Cathode, power switch S1A source electrode, a PV module cathode;
power switch S2The drain electrode is respectively connected with the anode of the energy storage unit and a diode D3The cathode and the cathode of the energy storage unit are connected with the cathode of the PV module and a diode D3Anode connected to power switch S3Source, power switch S3Drain electrode connecting capacitor C5One terminal, capacitor C5The other ends are respectively connected with a diode D4Anode, inductor L4One terminal, inductor L4The other end is connected with a capacitor C8The other end;
the first boosting unit B includes: inductor L2Capacitor C4Capacitor C1Diode D5；
Capacitor C4One end is connected with a capacitor C3The other end, a capacitor C4The other ends are respectively connected with an inductor L2One terminal, diode D5Anode, diode D5Cathode connection capacitor C1One terminal of (1), inductance L2The other end is connected with a capacitor C7One end;
the second boosting unit C includes: inductor L5Capacitor C6Capacitor C2Diode D6；
Diode D6Cathode connection capacitor C8The other end, diode D6The anodes are respectively connected with a capacitor C6Another terminal, an inductance L5One terminal, inductor L5The other end is connected with a capacitor C2One terminal, capacitor C6One end is connected with a capacitor C5The other end;
a series of switches S2, S3 and a diode D are added to the conventional SEPIC and Cuk converters respectively3A constituent bidirectional power flow port. 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 is in fault, the other input end can work normally.
Capacitor Cin1、Cin2Parallel connection to PV modules and energy storageAnd a unit to reduce photovoltaic voltage ripple and battery charge-discharge current ripple.
Diode D1Preventing reverse flow to the photovoltaic module. VpvIs the voltage of the PV module, VbThe voltage of the energy storage device connected with the bidirectional port satisfies Vb＞Vpv。
In the input unit A, S2By-pass switching for discharging the battery, S3And D3A battery discharge branch. When the photovoltaic cell generates power with redundancy, VpvThrough diode D1Inductor L1Switch S3And a diode D3Charging the accumulator, at this time, switching tube S3Conduction, S1And S2And (6) turning off. When the photovoltaic cell generates insufficient power or the load power is larger, the storage battery passes through the switch tube S2Inductor L1And a switching tube S1Capacitor C1And C2Charging while supplying power to the load, at which time the switch tube S1、S2Conduction, S3And (6) turning off. The converter operates in three different states, respectively:
(1) single input and double output states: when the photovoltaic cell generates power with redundancy, the photovoltaic power generation supplies power to the load and the storage battery at the same time. In SIDO mode, switch S2Is always off. Switch S1、S3By adopting a staggered control mode, the power switch tube S3Controlling the charging voltage of the accumulator, power switching tube S3At only S1Is turned on when turned off, and S1、S3Is less than 1. The cell absorbs the excess energy of the PV module as output, corresponding to a boost converter from the PV port to the cell port, so Vb＞VpvIs necessary.
(2) Dual input single output state: when the power requirement of the load is larger than the power generation amount of the photovoltaic cell, the photovoltaic cell and the storage battery supply power to the load at the same time. In DISO mode, the photovoltaic module and the battery are used as input power sources of the direct current load, and the switch S3And a diode D3Is always off. Power switch tube S1、S2Adopts a staggered control mode, and S1、S2Is less than 1. And Vb＞VpvMust be satisfied to ensure that when switch S is on2When closed, diode D1Is the reverse cutoff.
(3) Single input single output state: when the photovoltaic cell can not generate electricity, the storage battery supplies power to the load independently, and in the SISO mode, S3Switch remains off, S2The switch remains closed; when the storage battery can not generate electricity, the photovoltaic cell solely supplies power to the load, and in the SISO mode, S2And S3Switch remains off, S1The switch controls the output voltage.
The invention discloses a novel high-gain dual-input DC-DC converter, which has the following beneficial effects:
1) the invention realizes the access of the energy storage unit by improving the structure of the traditional Sepic and Cuk converters, and only comprises three switches, thereby realizing photovoltaic power generation, battery charging and discharging and high-gain output. The switching of various working states of the SIDO, DISO and 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 dual-input DC/DC converter provided by the invention can flexibly set the load voltage level due to the loose limitation of the port voltage, thereby greatly expanding the application range. In addition, the efficiency of the converter is greatly improved due to the single stage power conversion between the power supply and the load. The high gain of input and output voltage is realized through the diode capacitor boosting unit, and the voltage and current stress of the main power switch tube is reduced.
Drawings
Fig. 1 is a schematic diagram of a novel high-gain dual-input DC-DC converter according to the present invention.
Fig. 2 is a schematic diagram of the novel high-gain dual-input DC-DC converter 2N-path boost expansion.
FIG. 3(a) shows the input voltage V under SISO operating conditions of the photovoltaic panel pv40, the number of the boosting units is 1;
FIG. 3(b) shows the input voltage V under SISO condition of the photovoltaic panelpvIs 40 litersA graph of the voltage of the capacitor and the voltage of the output voltage when the number of the voltage units is 1;
FIG. 3(c) shows the input voltage V under SISO condition of the photovoltaic panel pv40, the voltage waveform diagram of the switching tube when the number of the boosting units is 1;
FIG. 3(d) is the input voltage V of the present invention under the SISO condition of the photovoltaic panel pv40, the switching tube input signal and the input voltage waveform when the number of boosting units is 1.
FIG. 4(a) is a diagram showing an input voltage V of the present invention under a SISO condition of a storage battery pv50, the number of the boosting units is 1;
FIG. 4(b) is a diagram showing the input voltage V of the present invention under the SISO condition of the storage batterypvA graph of the capacitor voltage and the output voltage waveform for a number of booster cells of 50, 1;
FIG. 4(c) is a diagram of the input voltage V of the present invention under the SISO condition of the storage battery pv50, voltage waveform diagram of switching tube when the number of boosting units is 1;
FIG. 4(d) is a diagram of the input voltage V of the present invention under the SISO condition of the storage batterypvThe voltage waveform of the input voltage and the input signal of the switching tube when the number of the boosting units is 1 is 50.
FIG. 5(a) shows the input voltage V under DISO operation condition according to the present inventionpvAt 40, the battery voltage V b50, the number of the boosting units is 1;
FIG. 5(b) shows the input voltage V under DISO operation condition according to the present inventionpvAt 40, the battery voltage VbA graph of the capacitor voltage and the output voltage waveform for a number of booster cells of 50, 1;
FIG. 5(c) is the input voltage V under DISO operation condition of the present inventionpvAt 40, the battery voltage V b50, voltage waveform diagram of switching tube when the number of boosting units is 1;
FIG. 5(d) is the input voltage V under DISO operation condition of the present inventionpvAt 40, the battery voltage VbThe voltage waveform of the input voltage and the input signal of the switching tube when the number of the boosting units is 1 is 50.
FIG. 6(a) is the input voltage V under the SIDO condition of the present inventionpvIs the number of 40, and the weight of the product,the inductor current oscillogram when the number of the boosting units is 1;
FIG. 6(b) is the input voltage V under the SIDO condition of the present invention pv40, a graph of the capacitor voltage and the output voltage waveform when the number of the booster cells is 1;
FIG. 6(c) is the input voltage V under the SIDO condition of the present invention pv40, the voltage waveform diagram of the switching tube when the number of the boosting units is 1;
FIG. 6(d) is the input voltage V under the SIDO condition of the present invention pv40, the switching tube input signal and the input voltage waveform when the number of boosting units is 1.
Detailed Description
The present invention will be described in further detail 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 its internal connection relationship is:
the input unit consists of a basic Sepic circuit and a basic Cuk circuit and comprises three inductors L1、L3、L4Four capacitors C3、C5、C7、C8Three power switches S1、S2、S3Four diodes D1、D2、D3、D4(ii) a The connection form is as follows: diode D1Is connected with the anode of the photovoltaic input, and the cathode is connected with the inductor L1And through a power switch S2Connected to the positive pole of the energy storage unit, inductor L1The other end of which passes through a power switch S1Negative electrode connected to photovoltaic input, capacitor C3And one end of (A) and L1And the other end of (1) and S3Connected to a capacitor C3Is connected at the other end to L3And a diode D2Anode of (D)2Cathode of (2) is connected to7Negative pole to photovoltaic input, L3Another terminal of (1) and a diode D4Is connected with the cathode of C8And C and7is connected at the other end, diode D4And L and4and C and5in addition toOne end connected to a diode D3With S3The cathode is connected with the anode of the energy storage unit;
the boosting unit B comprises an inductor L2A capacitor C4A capacitor C1And a diode D5The boosting unit C comprises an inductor L5A capacitor C6A capacitor C2And a diode D6(ii) a The connection form is as follows: capacitor C in booster unit B4And a diode D2Is connected to the anode of a capacitor C4Another end of (1) and an inductor L2And a diode D5Is connected to the anode of a diode D5The cathode of the anode is connected with a load; capacitor C in booster unit C6One end of (1) and an inductor L4Is connected to one terminal of a capacitor C6Another end of (1) and an inductor L5And a diode D6Is connected with the anode of the inductor L5The other end of the first switch is connected with a load;
in the input unit A, S2By-pass switching for discharging the battery, S3And D3A battery discharge branch. When the photovoltaic cell generates power with redundancy, VpvThrough diode D1Inductor L1Switch S3And a diode D3Charging the accumulator, at this time, switching tube S3Conduction, S1And S2And (6) turning off. When the photovoltaic cell generates insufficient power or the load power is larger, the storage battery passes through the switch tube S2Inductor L1And a switching tube S1Capacitor C1And C2Charging while supplying power to the load, at which time the switch tube S1、S2Conduction, S3And (6) turning off. The converter operates in three different states, respectively:
(1) single input and double output states: when the photovoltaic cell generates power with redundancy, the photovoltaic power generation supplies power to the load and the storage battery at the same time. In SIDO mode, switch S2Is always off. Switch S1、S3By adopting a staggered control mode, the power switch tube S3Controlling the charging voltage of the accumulator, power switching tube S3At only S1Is turned on when turned off, and S1、S3Is less than 1. The cell absorbs the excess energy of the PV module as output, corresponding to a boost converter from the PV port to the cell port, so Vb＞VpvIs necessary.
(2) Dual input single output state: when the power requirement of the load is larger than the power generation amount of the photovoltaic cell, the photovoltaic cell and the storage battery supply power to the load at the same time. In DISO mode, the photovoltaic module and the battery are used as input power sources of the direct current load, and the switch S3And a diode D3Is always off. Power switch tube S1、S2Adopts a staggered control mode, and S1、S2Is less than 1. And Vb＞VpvMust be satisfied to ensure that when switch S is on2When closed, diode D1Is the reverse cutoff.
(3) Single input single output state: when the photovoltaic cell can not generate electricity, the storage battery supplies power to the load independently, and in the SISO mode, S3Switch remains off, S2The switch remains closed; when the storage battery can not generate electricity, the photovoltaic cell solely supplies power to the load, and in the SISO mode, S2And S3Switch remains off, S1The 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 cell1、L2、L3、L4、L5The current is continuous, and FIG. 3(b) to FIG. 3(C) show the capacitance C3、C4、C5、C6And a power switch S1、S2、S3The voltage stress experienced is low and fig. 3(d) shows how the photovoltaic cell panel voltage and the drive between the individual switching tubes is controlled. Obviously, the simulation results are consistent with previous theoretical analysis.
It can be seen from FIG. 4(a) that the inductance L is in the SISO condition of the storage battery1、L2、L3、L4、L5The current is continuous, and FIG. 4(b) to FIG. 4(C) show the capacitance C3、C4、C5、C6And a power switch S1、S2、S3Voltage stress to whichLower, fig. 4(d) shows how the battery voltage and the drive between the individual switching tubes are controlled. Obviously, the simulation results are consistent with previous theoretical analysis.
It can be seen from FIG. 5(a) that the inductance L is in DISO operation1、L2、L3、L4、L5The current is continuous, and FIG. 5(b) to FIG. 5(C) show the capacitance C3、C4、C5、C6And a power switch S1、S2、S3The voltage stress experienced is low and fig. 5(d) shows how the photovoltaic panel voltage, the battery voltage and the drive between the individual switching tubes are controlled. Obviously, the simulation results are consistent with previous theoretical analysis.
From FIG. 6(a), it can be seen that the inductance L is under the SIDO condition1、L2、L3、L4、L5The current is continuous, and FIG. 6(b) to FIG. 6(C) show the capacitance C3、C4、C5、C6And a power switch S1、S2、S3The voltage stress experienced is low and fig. 6(d) shows how the photovoltaic cell panel voltage, the battery charging current and the drive between the individual switching tubes are controlled. Obviously, the simulation results are consistent with previous theoretical analysis.
The invention can also realize N-path boosting expansion at the same time, as shown in FIG. 2:
a novel high-gain dual-input DC-DC converter, the converter comprising:
the device comprises an input unit A, N first boosting units B, N second boosting units C and a load unit D;
the input unit a includes: inductor L1、L3、L4Capacitor C3、C5、C7、C8Power switch S1、S2、S3Diode D1、D2、D3、D4；
Diode D1Anode connected to the positive pole of PV module, diode D1The cathodes are respectively connected with an inductor L1One terminal, power switch S2A source electrode; inductor L1One end is respectively connected with a power switch S1Drain electrode, power switch S3Drain electrode, capacitor C3One end; capacitor C3The other ends are respectively connected with an inductor L3One terminal, diode D2Anode, diode D2Cathode connection capacitor C7One end;
capacitor C7The other ends are respectively connected with a capacitor C8One terminal, inductor L3Another terminal, diode D4Cathode, power switch S1A source electrode, a PV module cathode;
power switch S2The drain electrode is respectively connected with the anode of the energy storage unit and a diode D3The cathode and the cathode of the energy storage unit are connected with the cathode of the PV module and a diode D3Anode connected to power switch S3Source, power switch S3Drain electrode connecting capacitor C5One terminal, capacitor C5The other ends are respectively connected with a diode D4Anode, inductor L4One terminal, inductor L4The other end is connected with a capacitor C8The other end;
the first boosting unit B includes N boosting modules:
the 1 st boost module comprises an inductor L21A capacitor C41A capacitor C11A diode D51；
The 2 nd boosting module comprises an inductor L22A capacitor C42A capacitor C12A diode D52；
The 3 rd boosting module comprises an inductor L23A capacitor C43A capacitor C13A diode D53；
.... analogized in turn;
the Nth boosting module comprises an inductor L2NA capacitor C4NA capacitor C1NA diode D5N；
The connection relationship is as follows:
capacitor C41One end of the capacitor is connected with the capacitor C in the input unit A3The other end, a capacitor C41The other ends are respectively connected with an inductor L21One terminal, diode D51Anode, diode D51Cathode connection capacitor C11One terminal, inductor L21The other end is connected with a diode D in the input unit (A)2A cathode;
among N boost module:
capacitor C in 2 nd boosting module42One end of the capacitor C is connected with the 1 st boosting module41The other end, a capacitor C42The other ends are respectively connected with a diode D52Anode, inductor L22One terminal, diode D52Cathode connection capacitor C12One terminal, inductor L22The other end is connected with a diode D in the 1 st boosting module51A cathode;
capacitor C in No. 3 boost Module43One end of the capacitor C is connected with the 2 nd boosting module42The other end, a capacitor C43The other ends are respectively connected with a diode D53Anode, inductor L23One terminal, diode D53Cathode connection capacitor C13One terminal, inductor L23The other end is connected with a diode D in the 2 nd boosting module52A cathode;
.... analogized in turn;
capacitor C in Nth boosting module4NOne end of the capacitor C is connected with the N-1 th boosting module4(N-1)The other end, a capacitor C4NThe other ends are respectively connected with a diode D5NAnode, inductor L2NOne terminal, diode D5NCathode connection capacitor C1NOne terminal, inductor L2NThe other end is connected with a diode D in the (N-1) th boosting module5(N-1)A cathode;
the second boosting unit C includes N boosting sections:
the 1 st boosting part comprises an inductor L51A capacitor C61A capacitor C21A diode D61；
The 2 nd boosting part comprises an inductor L52A capacitor C62A capacitor C22A diode D62；
.... analogized in turn;
the Nth boosting part comprises an inductor L5NA capacitor C6NA capacitor C2NA diode D6N；
The connection relationship is as follows:
capacitor C61One end of the capacitor C is connected with the input unit (A)5The other end, a capacitor C61The other ends are respectively connected with an inductor L51One terminal, diode D61Anode, diode D61Cathode connection capacitor C8One terminal, inductor L51The other end is connected with a capacitor C21One end;
between the N boosting parts:
capacitor C in 2 nd boosting module62One end of the capacitor C is connected with the 1 st boosting module61The other end, a capacitor C62The other ends are respectively connected with an inductor L52One terminal, diode D62Anode, diode D62Cathode connection capacitor C21One terminal, inductor L52The other end is connected with a capacitor C22One end;
capacitor C in No. 3 boost Module63One end of the capacitor C is connected with the 2 nd boosting module62The other end, a capacitor C63The other ends are respectively connected with an inductor L53One terminal, diode D63Anode, diode D63Cathode connection capacitor C22One terminal, inductor L53The other end is connected with a capacitor C23One end;
.... analogize in turn;
capacitor C in Nth boosting module6NOne end of the capacitor C is connected with the N-1 th boosting module6(N-1)The other end, a capacitor C6NThe other ends are respectively connected with an inductor L5NOne terminal, diode D6NAnode, diode D6NCathode connection capacitor C2(N-1)One terminal, inductor L5NThe other end is connected with a capacitor C2NOne end;
load RLOne end of the capacitor C is connected with the Nth boosting module1NOne end, load RLThe other end is connected with the capacitor in the Nth boosting partC2NAnd the other end.
In summary, the novel high-gain dual-input DC-DC converter provided by the invention realizes the access of the energy storage unit, the coordination work between the energy storage unit and the photovoltaic cell, and the high gain of the output voltage. The problems of low energy utilization rate, high design cost and the like of a traditional parallel structure are solved through the integrated multi-port DC/DC converter, input and output high gains are realized through the diode capacitance inductance multiplication unit, and the voltage and current stress on the main power switch tube is reduced. The invention is suitable for a new energy power generation system containing an energy storage unit, the implementation example is a multi-working-condition high-gain DC/DC converter which is simply constructed for explaining the working principle, and in practical application, the scheme can be slightly improved according to the practical situation, so that the aims of optimizing efficiency and saving cost are fulfilled.

Claims (6)

1. A novel high-gain dual-input DC-DC converter, characterized in that the converter comprises:
an input unit (A), a first boosting unit (B), a second boosting unit (C), and a load unit (D);
the input unit (A) includes: inductor L1、L3、L4Capacitor C3、C5、C7、C8Power switch S1、S2、S3Diode D1、D2、D3、D4；
Diode D1Anode connected to the positive pole of PV module, diode D1The cathodes are respectively connected with an inductor L1One terminal, power switch S2A source electrode; inductor L1One end is respectively connected with a power switch S1Drain electrode, power switch S3Drain electrode, capacitor C3One end; capacitor C3The other ends are respectively connected with an inductor L3One terminal, diode D2Anode, diode D2Cathode connection capacitor C7One end;
capacitor C7The other ends are respectively connected with a capacitor C8One terminal, inductor L3Another terminal, diode D4Cathode, power switch S1A source electrode, a PV module cathode;
power switch S2The drain electrode is respectively connected with the anode of the energy storage unit and a diode D3The cathode and the cathode of the energy storage unit are connected with the cathode of the PV module and a diode D3Anode connected to power switch S3Source, power switch S3Drain electrode connecting capacitor C5One terminal, capacitor C5The other ends are respectively connected with a diode D4Anode, inductor L4One terminal, inductor L4The other end is connected with a capacitor C8The other end;
the first boosting unit (B) includes: inductor L2Capacitor C4Capacitor C1Diode D5；
Capacitor C4One end is connected with a capacitor C3The other end, a capacitor C4The other ends are respectively connected with an inductor L2One terminal, diode D5Anode, diode D5Cathode connection capacitor C1One terminal of (1), inductance L2The other end is connected with a capacitor C7One end;
the second boosting unit (C) includes: inductor L5Capacitor C6Capacitor C2Diode D6；
Diode D6Cathode connection capacitor C8The other end, diode D6The anodes are respectively connected with a capacitor C6Another terminal, an inductance L5One terminal, inductor L5The other end is connected with a capacitor C2One terminal, capacitor C6One end is connected with a capacitor C5And the other end.
2. The novel high-gain dual-input DC-DC converter according to claim 1, characterized in that: composed of switches S2, S3 and diode D3A constituent bidirectional power flow port; the three-port converters of the two unipolar direct-current micro-grids are constructed and combined into an input unit (A) through device multiplexing, and when one input end fails, the other input end can work normally.
3. The novel high-gain dual-input DC-D of claim 1A C converter, characterized by: capacitor Cin1、Cin2Are respectively connected in parallel to the PV module and the energy storage unit.
4. The novel high-gain dual-input DC-DC converter according to claim 1, characterized in that: diode D1Preventing reverse flow to the photovoltaic module; vpvIs the voltage of the PV module, VbThe voltage of the energy storage device connected with the bidirectional port satisfies Vb＞Vpv；
In the input unit (A), S2By-pass switching for discharging the battery, S3And D3A discharging branch circuit for the battery; when the photovoltaic cell generates power with redundancy, VpvThrough diode D1Inductor L1Switch S3And a diode D3Charging the accumulator, at this time, switching tube S3Conduction, S1And S2Turning off; when the photovoltaic cell generates insufficient power or the load power is larger, the storage battery passes through the switch tube S2Inductor L1And a switching tube S1Capacitor C1And C2Charging while supplying power to the load, at which time the switch tube S1、S2Conduction, S3And (6) turning off.
5. The novel high-gain dual-input DC-DC converter according to claim 1, characterized in that: the converter operates in three different states, respectively:
(1) single input and double output states: when the photovoltaic cell generates power with redundancy, the photovoltaic power generation supplies power to the load and the storage battery at the same time; in SIDO mode, switch S2Is always off; switch S1、S3By adopting a staggered control mode, the power switch tube S3Controlling the charging voltage of the accumulator, power switching tube S3At only S1Is turned on when turned off, and S1、S3The sum of the duty cycles of (a) is less than 1; the cell absorbs the excess energy of the PV module as output, corresponding to a boost converter from the PV port to the cell port, so Vb＞VpvIs necessary;
(2) dual input single output state: when the load power requirement is larger than the power generation capacity of the photovoltaic cell, the photovoltaic cell and the storage battery supply power to the load at the same time; in DISO mode, the photovoltaic module and the battery are used as input power sources of the direct current load, and the switch S3And a diode D3Is always off; power switch tube S1、S2Adopts a staggered control mode, and S1、S2The sum of the duty cycles of (a) is less than 1; and Vb＞VpvMust be satisfied to ensure that when switch S is on2When closed, diode D1Is a reverse cutoff;
(3) single input single output state: when the photovoltaic cell can not generate electricity, the storage battery supplies power to the load independently, and in the SISO mode, S3Switch remains off, S2The switch remains closed; when the storage battery can not generate electricity, the photovoltaic cell solely supplies power to the load, and in the SISO mode, S2And S3Switch remains off, S1The switch controls the output voltage.
6. A novel high-gain dual-input DC-DC converter, the converter comprising:
the device comprises an input unit (A), N first boosting units (B), N second boosting units (C) and a load unit (D);
the input unit (A) includes: inductor L1、L3、L4Capacitor C3、C5、C7、C8Power switch S1、S2、S3Diode D1、D2、D3、D4；
Diode D1Anode connected to the positive pole of PV module, diode D1The cathodes are respectively connected with an inductor L1One terminal, power switch S2A source electrode; inductor L1One end is respectively connected with a power switch S1Drain electrode, power switch S3Drain electrode, capacitor C3One end; capacitor C3The other ends are respectively connected with an inductor L3One terminal, diode D2Anode, diode D2Cathode connection capacitor C7One end;
capacitor C7The other ends are respectively connected with a capacitor C8One terminal, inductor L3Another terminal, diode D4Cathode, power switch S1A source electrode, a PV module cathode;
power switch S2The drain electrode is respectively connected with the anode of the energy storage unit and a diode D3The cathode and the cathode of the energy storage unit are connected with the cathode of the PV module and a diode D3Anode connected to power switch S3Source, power switch S3Drain electrode connecting capacitor C5One terminal, capacitor C5The other ends are respectively connected with a diode D4Anode, inductor L4One terminal, inductor L4The other end is connected with a capacitor C8The other end;
the first boosting unit (B) includes N boosting modules:
the 1 st boost module comprises an inductor L21A capacitor C41A capacitor C11A diode D51；
The 2 nd boosting module comprises an inductor L22A capacitor C42A capacitor C12A diode D52；
The 3 rd boosting module comprises an inductor L23A capacitor C43A capacitor C13A diode D53；
.... analogized in turn;
the Nth boosting module comprises an inductor L2NA capacitor C4NA capacitor C1NA diode D5N；
The connection relationship is as follows:
capacitor C41One end of the capacitor is connected with the capacitor C in the input unit A3The other end, a capacitor C41The other ends are respectively connected with an inductor L21One terminal, diode D51Anode, diode D51Cathode connection capacitor C11One terminal, inductor L21The other end is connected with a diode D in the input unit (A)2A cathode;
among N boost module:
2 nd (2)Capacitor C in the boost module42One end of the capacitor C is connected with the 1 st boosting module41The other end, a capacitor C42The other ends are respectively connected with a diode D52Anode, inductor L22One terminal, diode D52Cathode connection capacitor C12One terminal, inductor L22The other end is connected with a diode D in the 1 st boosting module51A cathode;
capacitor C in No. 3 boost Module43One end of the capacitor C is connected with the 2 nd boosting module42The other end, a capacitor C43The other ends are respectively connected with a diode D53Anode, inductor L23One terminal, diode D53Cathode connection capacitor C13One terminal, inductor L23The other end is connected with a diode D in the 2 nd boosting module52A cathode;
.... analogized in turn;
capacitor C in Nth boosting module4NOne end of the capacitor C is connected with the N-1 th boosting module4(N-1)The other end, a capacitor C4NThe other ends are respectively connected with a diode D5NAnode, inductor L2NOne terminal, diode D5NCathode connection capacitor C1NOne terminal, inductor L2NThe other end is connected with a diode D in the (N-1) th boosting module5(N-1)A cathode;
the second boosting unit (C) includes N boosting sections:
the 1 st boosting part comprises an inductor L51A capacitor C61A capacitor C21A diode D61；
The 2 nd boosting part comprises an inductor L52A capacitor C62A capacitor C22A diode D62；
.... analogized in turn;
the Nth boosting part comprises an inductor L5NA capacitor C6NA capacitor C2NA diode D6N；
The connection relationship is as follows:
capacitor C61One end is connected with the input unit(A) Capacitor C in5The other end, a capacitor C61The other ends are respectively connected with an inductor L51One terminal, diode D61Anode, diode D61Cathode connection capacitor C8One terminal, inductor L51The other end is connected with a capacitor C21One end;
between the N boosting parts:
capacitor C in 2 nd boosting module62One end of the capacitor C is connected with the 1 st boosting module61The other end, a capacitor C62The other ends are respectively connected with an inductor L52One terminal, diode D62Anode, diode D62Cathode connection capacitor C21One terminal, inductor L52The other end is connected with a capacitor C22One end;
capacitor C in No. 3 boost Module63One end of the capacitor C is connected with the 2 nd boosting module62The other end, a capacitor C63The other ends are respectively connected with an inductor L53One terminal, diode D63Anode, diode D63Cathode connection capacitor C22One terminal, inductor L53The other end is connected with a capacitor C23One end;
.... analogize in turn;
capacitor C in Nth boosting module6NOne end of the capacitor C is connected with the N-1 th boosting module6(N-1)The other end, a capacitor C6NThe other ends are respectively connected with an inductor L5NOne terminal, diode D6NAnode, diode D6NCathode connection capacitor C2(N-1)One terminal, inductor L5NThe other end is connected with a capacitor C2NOne end;
load RLOne end of the capacitor C is connected with the Nth boosting module1NOne end, load RLThe other end is connected with a capacitor C in the Nth boosting part2NAnd the other end.
CN202111062587.5A 2021-09-10 2021-09-10 Novel high-gain double-input DC-DC converter Active CN113890356B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014123173A1 (en) * 2013-02-08 2014-08-14 株式会社村田製作所 Dc-dc converter
CN106849681A (en) * 2017-04-11 2017-06-13 厦门大学 A kind of high-gain isolated active clamping Sofe Switch DC DC converters
CN108092512A (en) * 2017-12-11 2018-05-29 三峡大学 A kind of multi-state high-gain multiport DC/DC converters
CN109474183A (en) * 2018-12-25 2019-03-15 福州大学 A kind of dual input high-gain DC/DC converter
CN112737328A (en) * 2020-12-18 2021-04-30 福州大学 Non-isolated high-gain three-port converter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014123173A1 (en) * 2013-02-08 2014-08-14 株式会社村田製作所 Dc-dc converter
CN106849681A (en) * 2017-04-11 2017-06-13 厦门大学 A kind of high-gain isolated active clamping Sofe Switch DC DC converters
CN108092512A (en) * 2017-12-11 2018-05-29 三峡大学 A kind of multi-state high-gain multiport DC/DC converters
CN109474183A (en) * 2018-12-25 2019-03-15 福州大学 A kind of dual input high-gain DC/DC converter
CN112737328A (en) * 2020-12-18 2021-04-30 福州大学 Non-isolated high-gain three-port converter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
王辉;陈耀;张文博;: "一种三端口高增益DC/DC变换器", 电力科学与工程, no. 08 *

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