CN113890357B - Multi-working-condition high-gain three-port DC-DC converter based on Sepic - Google Patents

Multi-working-condition high-gain three-port DC-DC converter based on Sepic Download PDF

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Publication number
CN113890357B
CN113890357B CN202111063966.6A CN202111063966A CN113890357B CN 113890357 B CN113890357 B CN 113890357B CN 202111063966 A CN202111063966 A CN 202111063966A CN 113890357 B CN113890357 B CN 113890357B
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power switch
diode
switch tube
power
capacitor
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CN113890357A (en
Inventor
邾玢鑫
吕洋
赵宇辉
支树播
李振华
杨楠
马辉
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
    • 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
    • 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 multi-working condition high-gain three-port DC-DC converter based on Sepic comprises a basic Sepic converter, a boost unit and a load unit, wherein the basic Sepic converter comprises two inductors L 1 、L 2 Two capacitors C 1 、C 2 Three power switches S 1 ，S 2 ，S 3 Three diodes D 1 ，D 2 ，D 3 The method comprises the steps of carrying out a first treatment on the surface of the The boost unit comprises an inductor L 11 Diode D 11 Capacitance C 11 Capacitor C 12 The method comprises the steps of carrying out a first treatment on the surface of the The load unit comprises an output load R L . 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, improves the electric energy conversion efficiency, and has the advantages of wide input and output voltage regulation range, low voltage stress of a switching device and the like; and meanwhile, N times of boosting expansion can be realized on the boosting unit according to the requirement.

Description

Multi-working-condition high-gain three-port DC-DC converter based on Sepic
Technical Field
The invention relates to a DC-DC converter, in particular to a multi-working-condition high-gain three-port DC-DC converter based on Sepic.
Background
With the increasing severity of global problems such as energy crisis, greenhouse effect, atmospheric 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. The new energy power generation system containing the energy storage unit can stabilize the power generation output of the new energy micro power supply and improve the power supply stability of the system. In the traditional scheme of the hybrid multi-port converter, a new energy micro-power supply and an energy storage unit are generally connected with a direct current bus in parallel through respective DC/DC converters, and the problems of power generation output of the energy storage unit balance micro-power supply and power supply stability improvement of a system can be solved by adopting the structure, namely, the parallel structure of the respective DC/DC converters and the direct current bus, so that the energy storage system needs to perform electric energy conversion twice when charged and discharged each time, the problems of electric energy waste, low electric energy utilization rate and the like are caused, and the parallel structure also increases the design cost of the system and the design complexity of a controller.
In addition, most of the current multiport converters are based on the conventional converter structure such as boost, cuk, zeta, and are limited by low boosting capability, and the high gain achieved by the coupling inductance causes large voltage and current stress of the switching tube due to leakage inductance. Therefore, the improvement based on the existing basic DC/DC converter 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 switching 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 multi-working-condition high-gain three-port DC-DC converter based on Sepic is provided, the converter realizes the integration of the three-port DC/DC converter and the high-gain DC/DC converter, 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 prior art, 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.
The technical scheme adopted by the invention is as follows:
a Sepic-based multi-condition high-gain three-port DC-DC converter, the converter comprising:
a basic Sepic converter, a boosting unit B and a load unit C;
the basic Sepic converter comprises: inductance L 1 、L 2 Capacitance C 1 、C 2 Power switch S 1 ，S 2 ，S 3 Diode D 1 ，D 2 ，D 3 ；
Inductance L 1 One end is respectively connected with a diode D 2 Cathode, power switch S 2 Source, diode D 2 Anode connection unidirectional output port u PV Positive pole, power switch S 2 The drains are respectively connected with the energy storage unit u B Positive electrode, power switch S 3 A source electrode;
inductance L 1 The other ends are respectively connected with a diode D 3 Anode, capacitor C 1 One-end power switch S 1 Drain, diode D 3 Cathode connection power switch S 3 A drain electrode;
capacitor C 1 The other end is connected with an inductor L 2 One end of diode D 1 Anode, diode D 1 Cathode connection capacitor C 2 One end; capacitor C 2 Another end, inductance L 2 Another end, power switch S 1 Source electrode, energy storage unit u B The cathodes are all connected with a unidirectional output port u PV A negative electrode;
the boosting unit B includes: inductance L 11 Diode D 11 Capacitance C 11 Capacitance C 12 ；
Capacitor C 11 One end is connected with a capacitor C 1 Another end, capacitor C 11 The other end is connected with an inductor L 11 One end of diode D 11 Anode, inductance L 11 The other end is connected with a capacitor C 2 One end of diode D 11 Cathode and capacitor C 12 One end is connected with a capacitor C 12 The other end and the capacitor C 2 The other end is connected with the other end;
the load unit C loads R L ；
Load R L One end is respectively connected with a diode D 11 Cathode, capacitor C 12 One end of the load R L The other end and the capacitor C 12 The other end is connected.
In the basic Sepic converter, an energy storage unit u B Unidirectional output port u PV Diode D 2 、D 3 Power switch S 2 ，、S 3 And an energy storage unit u B An input unit a is constituted and is provided,
in the input unit A, a power switch tube S 2 、S 3 Diode D 3 Respectively form an energy storage unit u B A discharge branch and a charge branch of (a);
when the micro power supply has redundancy in power generation, the unidirectional output port u PV Through diode D 2 Inductance L 1 Diode D 3 And a power switch tube S 3 To the energy-storage unit u B Charging, at this time, power switch tube S 2 Turning off;
when the micro power supply is insufficient in power generation or the load R L When the power is larger, the energy storage unit u B Through power switch tube S 2 Inductance L 1 Capacitance C 1 Diode D 1 Inductance L 3 And diode D 4 For the load R L Power supply, at this time, power switch tube S 2 Conduction, S 3 And (5) switching off.
The invention discloses a multi-working condition high-gain three-port DC-DC converter based on Sepic, which has the following technical effects:
1) The invention realizes the connection of the energy storage unit by improving the structure of the traditional Sepic converter, and only comprises three switches to realize photovoltaic power generation, battery charge and discharge and high-gain output. 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 three-port 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 three-port 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 boost unit B 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 circuit diagram of the present invention.
FIG. 2 is a schematic diagram of an extended N boost unit circuit of the present invention.
Fig. 3 is a schematic diagram of a conventional Sepic converter.
FIG. 4 (1) shows the input voltage u under the SISO condition of the photovoltaic panel pv 30, inductance L when the number of the boosting units is 1 1 Inductance L 2 Inductance L 11 A current waveform diagram;
FIG. 4 (2) shows the input voltage u under the SISO condition of the photovoltaic panel pv 30, capacitance C when the number of boosting units is 1 1 、C 2 、C 11 Voltage and output voltage U 0 A waveform diagram;
FIG. 4 (3) shows the input voltage u under the SISO condition of the photovoltaic panel pv 30, power switch S when the number of boosting units is 1 1 、S 2 、S 3 A waveform diagram of the reverse voltage born by the power supply;
FIG. 4 (4) shows the input voltage u under the SISO condition of the photovoltaic panel pv 30, photovoltaic panel voltage and power switch S when the number of boosting units is 1 1 、S 2 、S 3 A driving waveform diagram.
FIG. 5 (1) shows the battery voltage u under the battery SISO condition of the present invention B 40, inductance L when the number of the boosting units is 1 1 Inductance L 2 Inductance L 11 A current waveform diagram;
FIG. 5 (2) shows the battery voltage u under the battery SISO condition of the present invention B 40, capacitance C when the number of boosting units is 1 1 、C 2 、C 11 Voltage and output voltage U 0 A waveform diagram;
FIG. 5 (3) shows the battery voltage u under the battery SISO condition of the present invention B 40, power switch S when the number of boosting units is 1 1 、S 2 、S 3 A waveform diagram of the reverse voltage born by the power supply;
FIG. 5 (4) shows the battery voltage u under the battery SISO condition of the present invention B 40, the battery voltage and the power switch S when the number of the boosting units is 1 1 、S 2 、S 3 A driving waveform diagram.
FIG. 6 (1) shows the input voltage u under DISO conditions pv 30, battery voltage u B 40, inductance L when the number of the boosting units is 1 1 Inductance L 2 Inductance L 11 A waveform diagram;
FIG. 6 (2) shows the input voltage u under DISO conditions pv 30, battery voltage u B 40, capacitance C when the number of boosting units is 1 1 、C 2 、C 11 Voltage and output voltage U 0 A waveform diagram;
FIG. 6 (3) shows the input voltage u under DISO conditions pv 30, battery voltage u B 40, power switch S when the number of boosting units is 1 1 、S 2 、S 3 A waveform diagram of the reverse voltage born by the power supply;
FIG. 6 (4) shows the input voltage u under DISO conditions pv 30, battery voltage u B 40, the battery voltage, the photovoltaic panel voltage and the power switch S when the number of the boosting units is 1 1 、S 2 、S 3 A driving waveform diagram.
FIG. 7 (1) shows the input voltage u under SIDO conditions pv 30, inductance L when the number of the boosting units is 1 1 Inductance L 2 Inductance L 11 A waveform diagram;
FIG. 7 (2) shows the input voltage u under SIDO conditions pv 30, capacitance C when the number of boosting units is 1 1 、C 2 、C 11 Voltage and output voltage U 0 A waveform diagram;
FIG. 7 (3) shows the input voltage u under SIDO conditions pv 30, power switch S when the number of boosting units is 1 1 、S 2 、S 3 Is born byReverse voltage waveform diagram;
FIG. 7 (4) shows the input voltage u under SIDO conditions pv 30, photovoltaic panel voltage, battery charging current and power switch S when the number of the boosting units is 1 1 、S 2 、S 3 A driving waveform diagram.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, a multi-working condition high-gain three-port DC-DC converter based on Sepic is composed of a basic Sepic converter, an input unit a, a boost unit B, and a load unit C, and the internal connection relationship is as follows:
the basic Sepic converter and the input unit a comprise two inductances L 1 、L 2 Two capacitors C 1 、C 2 Three power switches S 1 ，S 2 ，S 3 Three diodes D 1 ，D 2 ，D 3 The method comprises the steps of carrying out a first treatment on the surface of the The connection form is as follows: inductance L 1 One end of (a) is respectively connected with the power switch S 2 Source of (D) and diode D 2 Is connected with the cathode of the inductor L 1 Respectively with diode D 3 Anode, power switch S of (2) 1 Drain of (d) and capacitor C 1 Is connected to one end of the inductor L 2 One end of (a) is respectively connected with the capacitor C 1 Is connected to the other end of the diode D 1 Anode of (C) is connected with inductance L 2 Respectively with the other end of the capacitor C 2 Another end of (a) power switch S 1 Source electrode of (a) energy storage unit u B Negative electrode of (a) and unidirectional output port u PV Is connected with the negative electrode of the capacitor C 2 And diode D 1 Is connected with the cathode of diode D 2 Is provided with an anode unidirectional output port u PV The positive electrode of diode D is connected with 3 Cathode and power switch S of (2) 3 Is connected with the drain electrode of the power switch S 2 Drain-to-drain power switch S 3 Source of (a) and energy storage unit u B Is connected with the positive electrode of the battery;
the boost unit B comprises an inductor L 11 Diode D 11 Capacitance C 11 Capacitance C 12 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the method comprises the steps ofCapacitor C 11 One end of (a) is respectively connected with the capacitor C 1 Is connected with the other end of diode D 1 Anode of (d) and inductance L 2 Is connected to one end of capacitor C 11 Respectively with the other end of the inductor L 11 Is connected to the other end of the diode D 11 Anode of (C) is connected with inductance L 11 One end of (a) is respectively connected with the capacitor C 2 Is connected to one end of diode D 1 Is connected with the cathode of diode D 11 Cathode and capacitor C of (2) 12 One end is connected with a capacitor C 12 The other end and the capacitor C 2 The other end is connected with the other end;
the load unit C outputs a load R L The method comprises the steps of carrying out a first treatment on the surface of the Wherein the load R L One end is respectively connected with a diode D 11 Cathode, capacitor C 12 One end of the load R L The other end is respectively connected with the capacitor C 12 Another end, capacitor C 2 Is the other end of (L) inductance 2 Another end of (a) power switch S 1 Source electrode of (a) energy storage unit u B Negative electrode of (a) and unidirectional output port u PV Is connected with the negative electrode of the battery;
in the input unit A, a power switch tube S 2 、S 3 Diode D 3 Respectively forming a discharging branch and a charging branch of the storage battery, and when the micro power supply generates electricity with redundancy, u PV Through diode D 2 Inductance L 1 Diode D 3 And a power switch tube S 3 Charging the accumulator, at this time the power switch tube S 2 Turning off; when the micro power supply is insufficient in power generation or the load power is large, the storage battery passes through the power switch tube S 2 Inductance L 1 Capacitance C 1 Diode D 1 Inductance L 3 And diode D 4 Power is supplied to the load, and at this time, the power switch tube S 2 Conduction, S 3 And (5) switching off.
The converter works in four different states, namely:
(1) Single input dual output state: when the photovoltaic cell is redundant in power generation, the photovoltaic power generation supplies power to the load and the storage battery at the same time, and in this state: power switch tube S 2 Always turn off, power switch S 1 、S 3 Adopts a staggered control mode, and the power switchTube 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.
(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 at the same time, and in the state: power switch S 3 Always turn off, first power by photovoltaic cell: at this time, power switch tube S 2 Closing, given power switching tube S 1 The photovoltaic panel outputs the maximum power, and then the storage battery supplies power: at this time, power switch tube S 2 Always closed by adjusting the power switch tube S 1 To adjust the output power.
(3) Single input single output state: when the photovoltaic cell is unable to generate electricity, the battery alone powers the load. In this state, the power switching tube S 2 Is always on, S 3 Is always turned off by adjusting the power switch tube S 1 To regulate the output voltage.
(4) Single input single output state: when the battery is fully charged, the photovoltaic cell alone supplies the load, in this state: power switch tube S 2 ，S 3 Is always turned off by adjusting the power switch tube S 1 To regulate the output voltage.
From FIG. 4 (1), it can be seen that the inductance L is under the SISO condition of the photovoltaic cell 1 Inductance L 2 Inductance L 11 The current is continuous, and fig. 4 (2) to 4 (3) show the capacitance C 1 、C 2 、C 11 And a power switch S 1 、S 2 、S 3 The voltage stress experienced is low and fig. 4 (4) shows how the panel voltage and the drive between the individual switching tubes is controlled.
From FIG. 5 (1), it can be seen that the inductance L is under the SISO condition of the battery 1 Inductance L 2 Inductance L 11 The current is continuous, and fig. 5 (2) to 5 (3) show the capacitance C 1 、C 2 、C 11 And a power switch S 1 、S 2 、S 3 The voltage stress is low, and FIG. 5 (4) showsThe battery voltage and how the drive between the individual switching tubes is controlled.
From FIG. 6 (1), it can be seen that the inductance L is under DISO conditions 1 Inductance L 2 Inductance L 11 The current is continuous, and fig. 6 (2) to 6 (3) show the capacitance C 1 、C 2 、C 11 And a power switch S 1 、S 2 、S 3 The voltage stress experienced is low and fig. 6 (4) shows how the panel voltage of the photovoltaic cell, the battery voltage and the drive between the individual switching tubes are controlled.
From FIG. 7 (1), it can be seen that the inductance L is under SIDO conditions 1 Inductance L 2 Inductance L 11 The current is continuous, and fig. 7 (2) to 7 (3) show the capacitance C 1 、C 2 、C 11 And a power switch S 1 、S 2 、S 3 The voltage stress experienced is low and fig. 7 (4) shows how the photovoltaic panel voltage, battery charging current and driving between individual switching tubes are controlled.
The invention adopts the following expansion scheme: n boost units B may also be included:
a Sepic-based multi-condition high-gain three-port DC-DC converter, the converter comprising:
the device comprises a basic Sepic converter, N boosting units B and a load unit C;
the basic Sepic converter comprises: inductance L 1 、L 2 Capacitance C 1 、C 2 Power switch S 1 ，S 2 ，S 3 Diode D 1 ，D 2 ，D 3 ；
Inductance L 1 One end is respectively connected with a diode D 2 Cathode, power switch S 2 Source, diode D 2 Anode connection unidirectional output port u PV Positive pole, power switch S 2 The drains are respectively connected with the energy storage unit u B Positive electrode, power switch S 3 A source electrode;
inductance L 1 The other ends are respectively connected with a diode D 3 Anode, capacitor C 1 One-end power switch S 1 Drain, diode D 3 Cathode connectionPower switch S 3 A drain electrode;
capacitor C 1 The other end is connected with an inductor L 2 One end of diode D 1 Anode, diode D 1 Cathode connection capacitor C 2 One end; capacitor C 2 Another end, inductance L 2 Another end, power switch S 1 Source electrode, energy storage unit u B The cathodes are all connected with a unidirectional output port u PV A negative electrode;
among the N boosting units B:
the first boosting unit includes: inductance L 11 Diode D 11 Capacitance C 11 Capacitance C 12 The method comprises the steps of carrying out a first treatment on the surface of the Wherein:
capacitor C 11 One end of the capacitor C is connected with the capacitor C in the basic Sepic converter 1 Another end, capacitor C 11 The other end is connected with an inductor L 11 One end of diode D 11 Anode, inductance L 11 The other end is connected with a capacitor C 2 One end of the capacitor C 12 One end of diode D 11 Cathode is connected with capacitor C 12 The other end and the capacitor C 2 The other end is connected with the other end;
the second boosting unit includes: inductance L 21 Diode D 21 Capacitance C 21 Capacitance C 22 The method comprises the steps of carrying out a first treatment on the surface of the Wherein:
capacitor C 21 One end is respectively connected with a capacitor C 11 Another end, capacitor C 21 The other ends are respectively connected with a diode D 21 Anode, inductance L 21 One end of the inductor L 21 The other end is connected with a capacitor C 12 One end of the capacitor C 22 One end of diode D 21 Cathode is connected with capacitor C 22 The other end and the capacitor C 12 The other end is connected with the other end;
the third boosting unit includes: inductance L 31 Diode D 31 Capacitance C 31 Capacitance C 32 The method comprises the steps of carrying out a first treatment on the surface of the Wherein:
capacitor C 31 One end is respectively connected with a capacitor C 21 Another end, capacitor C 31 The other ends are respectively connected with a diode D 31 Anode, inductance L 31 One end of the inductor L 31 The other end is provided withConnection capacitor C 22 One end of the capacitor C 32 One end of diode D 31 Cathode is connected with capacitor C 32 The other end and the capacitor C 22 The other end is connected with the other end;
… … and so on:
the (N-1) th booster cell includes: inductance L (N-1)1 Diode D (N-1)1 Capacitance C (N-1)1 Capacitance C (N-1)2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein:
capacitor C (N-1)1 One end is respectively connected with a capacitor C (N-2)1 Another end, capacitor C (N-1)1 The other ends are respectively connected with a diode D (N-1)1 Anode, inductance L (N-1)1 One end of the inductor L (N-1)1 The other end is connected with a capacitor C (N-2)2 One end of the capacitor C (N-1)2 One end of diode D (N-1)1 Cathode is connected with capacitor C (N-1)2 The other end and the capacitor C (N-2)2 The other end is connected with the other end;
the nth boosting unit includes: inductance L N1 Diode D N1 Capacitance C N1 Capacitance C N2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein:
capacitor C N1 One end is respectively connected with a capacitor C (N-1)1 Another end, capacitor C N1 The other ends are respectively connected with a diode D N1 Anode, inductance L N1 One end of the inductor L N1 The other end is connected with a capacitor C (N-1)2 One end of the capacitor C N2 One end of diode D N1 Cathode is connected with capacitor C N2 The other end and the capacitor C (N-1)2 The other end is connected with the other end;
the load unit (C) comprises a load R L The method comprises the steps of carrying out a first treatment on the surface of the Load R L One end is respectively connected with a diode D N1 Cathode, capacitor C N2 One end of the load R L The other end and the capacitor C N2 The other end is connected.
In summary, the multi-working condition high-gain three-port DC-DC converter based on Sepic 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 three-port 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 boosting multiplication unit, and reduces the 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 (2)

1. A multi-working condition high-gain three-port DC-DC converter based on Sepic is characterized in that the converter comprises:
a basic Sepic converter, a boost unit (B), a load unit (C);
the basic Sepic converter comprises: inductance L 1 、L 2 Capacitance C 1 、C 2 Power switch tube S 1 ，S 2 ，S 3 Diode D 1 ，D 2 ，D 3 ；
Inductance L 1 One end is respectively connected with a diode D 2 Cathode, power switch tube S 2 Source, diode D 2 Anode connection unidirectional output port u PV Positive electrode, power switch tube S 2 The drains are respectively connected with the energy storage unit u B Positive electrode, power switch tube S 3 A source electrode;
inductance L 1 The other ends are respectively connected with a diode D 3 Anode, capacitor C 1 One end, power switch tube S 1 Drain, diode D 3 Cathode connection power switch tube S 3 A drain electrode;
capacitor C 1 The other end is connected with an inductor L 2 One end of diode D 1 Anode, diode D 1 Cathode connection capacitor C 2 One end; capacitor C 2 Another end, inductance L 2 Another end, power switch tube S 1 Source electrode, energy storage unit u B The cathodes are all connected with a unidirectional output port u PV A negative electrode;
the boosting unit (B) includes: inductance L 11 Diode D 11 Capacitance C 11 Capacitance C 12 ；
Capacitor C 11 One end is connected with a capacitor C 1 Another end, capacitor C 11 The other end is connected with an inductor L 11 One end of diode D 11 Anode, inductance L 11 The other end is connected with a capacitor C 2 One end of diode D 11 Cathode and capacitor C 12 One end is connected with a capacitor C 12 The other end and the capacitor C 2 The other end is connected with the other end;
the load unit (C) loads R L ；
Load R L One end is respectively connected with a diode D 11 Cathode, capacitor C 12 One end of the load R L The other end and the capacitor C 12 The other end is connected with the other end; the converter works in four different states, namely:
(1) Single input dual output state: when the photovoltaic cell is redundant in power generation, the photovoltaic power generation supplies power to the load and the storage battery at the same time, and in this state: power switch tube S 2 Always turn off, power 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 Only in power switch tube S 1 On when off, and power switch tube S 1 、S 3 The sum of the duty cycles of (2) is less than 1;
(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 at the same time, and in the state: power switch tube S 3 Always turn off, first power by photovoltaic cell: at this time, power switch tube S 2 Closing, given power switching tube S 1 The photovoltaic panel outputs the maximum power, and then the storage battery supplies power: at this time, power switch tube S 2 Always closed by adjusting the power switch tube S 1 To adjust the output power;
(3) Single input single output state: when the photovoltaic cell cannot generate electricity, the storage battery independently supplies power to the load; in this state, the power switching tube S 2 Always on, power switch tube S 3 Is always turned off by adjusting the power switch tube S 1 Duty cycle of (a) to adjustOutputting a voltage;
(4) Single input single output state: when the battery is fully charged, the photovoltaic cell alone supplies the load, in this state: power switch tube S 2 ，S 3 Is always turned off by adjusting the power switch tube S 1 To regulate the output voltage.
2. The multi-operating high-gain three-port DC-DC converter according to claim 1, wherein: in the basic Sepic converter, an energy storage unit u B Unidirectional output port u PV Diode D 2 、D 3 Power switch tube S 2 、S 3 And an energy storage unit u B An input unit (A) is formed;
in the input unit (A), a power switch tube S 2 、S 3 Diode D 3 Respectively form an energy storage unit u B A discharge branch and a charge branch of (a);
when the micro power supply has redundancy in power generation, the unidirectional output port u PV Through diode D 2 Inductance L 1 Diode D 3 And a power switch tube S 3 To the energy-storage unit u B Charging, at this time, power switch tube S 2 Turning off;
when the micro power supply is insufficient in power generation or the load R L When the power is larger, the energy storage unit u B Through power switch tube S 2 Inductance L 1 Capacitance C 1 Diode D 1 Inductance L 3 And diode D 4 For the load R L Power supply, at this time, power switch tube S 2 Conduction and power switching tube S 3 And (5) switching off.
CN202111063966.6A 2021-09-10 2021-09-10 Multi-working-condition high-gain three-port DC-DC converter based on Sepic Active CN113890357B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013163776A1 (en) * 2012-05-02 2013-11-07 上海康威特吉能源技术有限公司 Dual-input step-up/step-down converter of wide input voltage range
CN108092512A (en) * 2017-12-11 2018-05-29 三峡大学 A kind of multi-state high-gain multiport DC/DC converters
CN111464023A (en) * 2020-04-30 2020-07-28 三峡大学 High-gain boosting and voltage-reducing Sepic DC-DC converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013163776A1 (en) * 2012-05-02 2013-11-07 上海康威特吉能源技术有限公司 Dual-input step-up/step-down converter of wide input voltage range
CN108092512A (en) * 2017-12-11 2018-05-29 三峡大学 A kind of multi-state high-gain multiport DC/DC converters
CN111464023A (en) * 2020-04-30 2020-07-28 三峡大学 High-gain boosting and voltage-reducing Sepic DC-DC converter

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