CN110912245B - Three-port integrated photovoltaic energy storage converter - Google Patents
Three-port integrated photovoltaic energy storage converter Download PDFInfo
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- CN110912245B CN110912245B CN201911151912.8A CN201911151912A CN110912245B CN 110912245 B CN110912245 B CN 110912245B CN 201911151912 A CN201911151912 A CN 201911151912A CN 110912245 B CN110912245 B CN 110912245B
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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
- 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
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses a three-port integrated photovoltaic energy storage converter, which comprises two switching tubes, three capacitors, two diodes and two inductors, wherein the two switching tubes are connected with the three capacitors; the three capacitors are respectively connected with the storage battery, the photovoltaic module and the load in parallel; the first switch tube and the second switch tube are conducted complementarily. A PWM + PFM modulation strategy is adopted to control the first inductor to work in a DCM, and frequency conversion control is adopted to realize maximum power point tracking control of the photovoltaic module; and controlling the second inductor to work in a CCM mode, and realizing constant voltage control of the load by adopting a variable duty ratio. The invention realizes the integration of the power switch by multiplexing the switch tube, reduces one switch tube and a driving module thereof, improves the integration level of the converter and reduces the cost.
Description
Technical Field
The invention belongs to the technical field of converter control, and particularly relates to a three-port integrated photovoltaic energy storage converter.
Background
With the increasing energy crisis and environmental pollution, photovoltaic power generation technology is receiving wide attention from governments and enterprises of various countries. Because solar energy has volatility and randomness, a photovoltaic power generation system needs to be provided with a storage battery to store and adjust electric energy, and continuous and stable power supply to loads (such as a direct current converter, an inverter, a direct current micro-grid and the like) is ensured. Therefore, the photovoltaic energy storage power generation system has three ports, namely a photovoltaic port, a storage battery and a load, and usually adopts two converters, namely a Boost photovoltaic interface and a Buck/Boost bidirectional energy storage interface, to respectively realize Maximum Power Point Tracking (MPPT) control of a photovoltaic array and charge and discharge control of the storage battery, as shown in fig. 1. The structure can effectively realize energy management and control of the photovoltaic energy storage system, but has the defects of large number of components, large volume and weight, low overall efficiency and the like.
Disclosure of Invention
In view of this, the invention provides a three-port integrated photovoltaic energy storage converter, which reduces switching tubes and driving modules thereof and improves the integration level of the converter.
The invention provides a three-port integrated photovoltaic energy storage converter, which comprises: the circuit comprises a first switch tube, a second switch tube, a first capacitor, a second capacitor, a third capacitor, a first diode, a second diode, a first inductor and a second inductor; the first switch tube and the second switch tube are conducted in a complementary mode, and the first inductor and the second inductor work in a DCM mode and a CCM mode respectively; the positive electrode of the photovoltaic array is connected with the first end of the first inductor and the first end of the first capacitor, and the negative electrode of the photovoltaic array is connected with the second end of the first capacitor, the negative electrode of the storage battery, the second end of the second capacitor, the source electrode of the first switching tube, the second end of the third capacitor and the negative electrode of the load; the positive electrode of the storage battery is connected with the first end of the second capacitor and the first end of the second inductor; the second end of the first inductor is connected with the anode of the first diode and the anode of the second diode; the cathode of the first diode is connected with the second end of the second inductor, the drain of the first switch tube and the source of the second switch tube; and the cathode of the second diode is connected with the drain of the second switching tube, the first end of the third capacitor and the anode of the load.
Preferably, the first switch tube and the second switch tube are both MOS tubes.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, through multiplexing of the switching tube, a Buck/Boost bidirectional energy storage interface converter and a Boost photovoltaic interface converter in a traditional photovoltaic energy storage system are integrated together, and through a mixed modulation strategy of PWM and PFM, flexible control of power flow among three ports is realized. Compared with the traditional converter for the photovoltaic energy storage system, the three-port integrated converter reduces one switching tube and a driving module thereof, improves the integration level of the system and reduces the cost. In addition, the three-port integrated converter provided by the invention can adapt to extreme conditions such as photovoltaic power sudden change, load power sudden change and the like in a photovoltaic energy storage system, and the reliability and stable operation of the system are ensured.
Drawings
Fig. 1 is a schematic diagram of a converter circuit structure for a photovoltaic energy storage system.
Fig. 2 is a schematic circuit diagram of a three-port integrated photovoltaic energy storage converter according to an embodiment of the present application.
Fig. 3(a) to 3(c) are equivalent circuit diagrams of different modes of a three-port integrated converter according to an embodiment of the present application.
Fig. 4(a) is an operation waveform diagram of the three-port integrated converter according to the embodiment of the present application when the three-port integrated converter operates in a photovoltaic and storage battery combined power supply mode.
Fig. 4(b) is an operation waveform diagram of the three-port integrated converter according to the embodiment of the present application when the three-port integrated converter operates in a photovoltaic simultaneous power supply mode to the battery and the load.
Fig. 5(a) and 5(b) are control block diagrams of a three-port integrated converter system according to an embodiment of the present application.
Fig. 6(a) is a simulation waveform of the three-port integrated converter according to the embodiment of the present application, in which the operation mode is switched from the photovoltaic and battery combined power supply mode to the photovoltaic and battery and load power supply mode due to the reduction of load power.
Fig. 6(b) is a simulation waveform of the three-port integrated converter according to the embodiment of the present application, in which the operation mode is switched from the photovoltaic and battery combined power supply mode to the photovoltaic simultaneous power supply mode to the battery and the load due to the increase of the output power of the photovoltaic array.
Fig. 7(a) is a simulation waveform of the three-port integrated converter according to the embodiment of the present application, in which the operation mode is switched from the photovoltaic power supply mode to the photovoltaic power supply mode and the battery power supply mode simultaneously due to the increase of the load power.
Fig. 7(b) is a simulation waveform of the three-port integrated converter according to the embodiment of the present application, in which the operation mode is switched from the photovoltaic power supply mode to the photovoltaic power supply mode and the battery and battery combined power supply mode simultaneously due to the reduction of the output power of the photovoltaic array.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, in an embodiment of the present invention, a three-port integrated photovoltaic energy storage converter is provided, where three ports of the converter are respectively connected to a photovoltaic array PV, a storage battery and a load, and the converter includes a first switch tube S1A second switch tube S2A first capacitor C1A second capacitor C2A third capacitor C3A first diode D1A second diode D2A first inductor L1And a second inductance L2(ii) a First switch tube S1And a second switch tube S2Complementary conduction, first inductance L1And a second inductance L2Respectively working in a DCM mode and a CCM mode; positive pole and first inductance L of photovoltaic array PV1First terminal and first capacitor C1Is connected with the first end of the photovoltaic array PV, the negative pole of the photovoltaic array PV and the first capacitor C1Second terminal, negative pole of the accumulator, second capacitor C2Second terminal, first switch tube S1Source electrode of, and third capacitor C3The second end of the load is connected with the negative pole of the load; positive pole of accumulator and second capacitor C2First terminal, second inductance L2Is connected with the first end of the first connecting pipe; first inductance L1Second terminal and first diode D1Anode of (2), second diode D2The anode of (2) is connected; first diode D1Cathode and second inductor L2Second terminal, first switch tube S1And a second switching tube S2Is connected to the source of (a); second diode D2Cathode and second switch tube S2Drain electrode of (1), third capacitor C3Is connected to the positive pole of the load.
In this embodiment, MOS transistors are used for the first switch transistor S1 and the second switch transistor S2.
The three-port integrated photovoltaic energy storage converter in the embodiment of the application has two working modes during normal working: photovoltaic and storage battery combined power supply mode and photovoltaic simultaneous power storagePool and load powered modes. The basic operating principle of the converter in these two operating modes is next analyzed. To simplify the analysis, it is first assumed that the system operation has reached steady state and the following conditions are met: (i) besides considering the internal resistance of the power tube, not considering the influence of other parameters of the power tube; (ii) the energy storage elements are ideal elements, all the capacitance capacities are large enough, the voltage ripple is ignored, namely the voltage U of the storage batteryBVoltage U of the photovoltaic arraypvAnd a load voltage UoConstant; (iii) first inductance L1Operating in DCM with a second inductor L2Operating in CCM mode.
(1) Mode 1: photovoltaic and storage battery combined power supply mode
When the power generated by the photovoltaic array cannot meet the load power, the converter works in a photovoltaic and storage battery combined power supply mode. The operation of the converter in one switching cycle can be divided into 3 modes, and the equivalent circuit corresponding to each operating mode is shown in fig. 3(a) -3 (c), wherein the solid arrows indicate the current direction of each mode. The main waveforms are shown in FIG. 4(a), and are analyzed below.
Mode 1: [ t ] of0-t1](the equivalent circuit is shown in FIG. 3 (a))
t0Before the moment, the first switch tube S1Off, the second switching tube S2Conducting the first diode D1A second diode D2Are all in an off state. First inductance L1Current of 0, second inductance L2Through a second switch tube S2And (4) linear discharging. At t0At the moment, the first switch tube S is switched on1Turning off the second switch tube S2Modality 1 begins. At this time, the first diode D1On, the second diode D2And (6) turning off. First inductance L1And a second inductance L2Respectively bear forward voltage UpvAnd UBSo that the first inductor current iL1(t) second inductor current iL2(t) are linearly increased, and the expressions are respectively:
mode 2: [ t ] of1-t2](the equivalent circuit is shown in FIG. 3 (b))
t1At any moment, the first switch tube S is turned off1Turning on the second switch tube S2Mode 1 ends and mode 2 begins. At this time, the first diode D1A second diode D2Are all turned on. First inductance L1Subject to reverse voltage Uo-UpvFirst inductor current i thereofL1(t) decreases linearly, expressed as:
first inductor current iL1(t) simultaneously through a second diode D2Branch and first diode D1And a second switch tube S2The two branches of the series branch follow currents. Flows through the first diode D1And a second diode D2The currents of (a) are:
second inductance L2Subject to reverse voltage Uo-UBSecond inductance L2Current i ofL2(t) via a second switching tube S2Follow current, whose expression is:
modality 3: [ t ] of2-t3](the equivalent circuit is shown in FIG. 3 (c))
t2At all times, the first inductance L1Current i ofL1(t) falls to 0, modality 2 ends, and modality 3 begins. At this time, the second switch S2Continuing to open the first switch tube S1A first diode D1And a second diode D2Are all in an off state. Second inductance L2Current i ofL2(t) still passes through the second switch tube S2The follow current has an expression similar to that of the formula (6), and is not described again. To t3At the moment, the first switch tube S is switched on1Turning off the second switch tube S2Mode 3 ends and the next switching cycle begins, and the process repeats.
(2) Mode 2: photovoltaic simultaneous supply mode to storage battery and load
When the power emitted by the photovoltaic array is larger than the load power, the system works in a photovoltaic simultaneous power supply mode for the storage battery and the load. The converter also has 3 modes in each switching period, and the equivalent circuit corresponding to each working mode is shown in fig. 3(a) -3 (c), wherein the dotted arrows indicate the current directions of the modes. The main waveforms are shown in FIG. 4(b), and are analyzed below.
Mode 1: [ t ] of0-t1](the equivalent circuit is shown in FIG. 3 (a))
t0Before the moment, the first switch tube S1Turning off the second switch tube S2Conducting the first diode D1A second diode D2Are all in an off state, the first inductor L1Is 0, the second inductance L2Through a second switch tube S2Is discharged linearly and the second inductor current iL2The direction of (t) is opposite to the reference direction. At t0At the moment, the first switch tube S is switched on1Turning off the second switch tube S2First diode D1Conducting, second diode D2And (6) turning off. First inductance L1And a second inductance L2Are all subjected to forward voltage and are respectively UpvAnd UB. So that the first inductor current iL1(t) linear growth, second inductanceCurrent iL2(t) is inversely linearly decreased, and the expressions are respectively formula (1) and formula (2).
Mode 2: [ t ] of1-t2](the equivalent circuit is shown in FIG. 3 (b))
t1At all times, the first switch tube S is turned off1Turning on the second switch tube S2Mode 1 ends and mode 2 begins. At this time, the first diode D1A second diode D2Are all turned on. First inductance L1Subject to reverse voltage, its first inductor current iL1(t) decreases linearly, and the expression is formula (3). First inductor current i thereofL1(t) simultaneously through a second diode D2Branch and first diode D1And a second switch tube S2The two branches of the series branch follow currents. Flows through the first diode D1And a second diode D2Current of (I)D1(M2)And ID2(M2)The same as in the formulas (4) and (5), and will not be described in detail. Second inductance L2Subject to reverse voltage, second inductance L2Current i ofL2(t) increases in inverse linearity, and its expression is formula (6).
Modality 3: [ t ] of2-t3](the equivalent circuit is shown in FIG. 3 (c))
t2At all times, the first inductance L1Current i ofL2(t) drops to 0, mode 2 ends and mode 3 begins. A second switch tube S2Continuing to switch on the first switch tube S1A first diode D1And a second diode D2Are all in an off state. Second inductance L2Current i ofL2(t) still passes through the second switch tube S2The slope continues to increase in an inverse linear manner before the holding, and the expression is similar to the expression (6) and is not described in detail. To t3At the moment, the first switch tube S is switched on1Turning off the second switch tube S2Mode 3 ends and the next switching cycle begins and the process repeats.
The converter needs to supply the photovoltaic array voltage U under normal conditionspvAdjusting to realize MPPT control of the photovoltaic array; to output voltage UoAnd (5) adjusting to realize output constant voltage control. To achieve MPPT control and negativity of photovoltaic arraysThe converter needs to carry out closed-loop control on the voltage of the photovoltaic array and the output voltage at the same time, and two control quantities are needed. However, the first switch S of the two switches in the converter1And a second switching tube S2The complementary conduction is necessary, and the duty ratio cannot be respectively adjusted to realize the closed-loop control of two output variables. Therefore, the invention adopts a PWM + PFM mixed modulation strategy and simultaneously adjusts the frequency fsAnd duty cycle D controls converter photovoltaic array voltage and output voltage. The control strategy requires a first inductance L1Working in a Discontinuous Conduction Mode (DCM), the second inductor L2The method works in an inductive current discontinuous Mode (CCM), PFM closed-loop control is adopted for the voltage of the photovoltaic array, and PWM closed-loop control is adopted for the output voltage.
The implementation methods of MPPT control and output constant voltage control were analyzed according to the inverter system control block diagrams shown in fig. 5(a) -5 (b).
Neglecting the influence of loss and other parasitic parameters of the converter and the voltage U at the photovoltaic arraypvAnd frequency fsThe relationship of (A) is as follows:
under MPPT control, the other quantities are considered to be approximately constant. Then follows UpvIncrease of (2), frequency fsAnd gradually increases. The PFM control block diagram for this mode is shown in fig. 5 (a). In the figure, PFM is a frequency modulation circuit which can change the triangular carrier frequency f of a PWM modulatorsAnd f is asFollowing the input voltage u of the PFM circuitc1Is increased and gradually decreased.
Neglecting the influence of the losses and other parasitic parameters of the converter, outputting the voltage UoThe relationship with duty cycle D is as follows:
under the control of output constant voltage, approximately consider UBAnd is not changed. Then follows UoThe duty ratio D is gradually increased. The PWM control block diagram of this mode is shown in fig. 5 (b). In the figure d represents the instantaneous value of the duty cycle.
In order to verify the working principle of the converter and the correctness of a control strategy, Saber simulation software is utilized to build a three-port photovoltaic energy storage converter model. The energy storage element in the model is an ideal device, and the influence of other parasitic parameters is neglected except for considering the internal resistance of the power tube. The parameters of each port are shown in table 1.
TABLE 1 parameters of the ports
Two conditions exist when the mode 1 (photovoltaic and storage battery combined power supply) is switched to the mode 2 (photovoltaic simultaneously supplies power to the storage battery and the load), and simulation results are shown in fig. 6(a) to 6 (b):
(1) photovoltaic array output power Ppv1kW, load power PoMutation from 1.3kW to 0.7 kW.
As shown in FIG. 6(a), before the time of 100ms, the battery current iBA value of 2.29A indicates that the battery is in a discharged state; and the photovoltaic array outputs power Ppv1kW (10A is multiplied by 100V), and the power P required by the loado1.3kW (3.25 A.times.400V), PpvLess than PoAnd the system is in a photovoltaic and storage battery combined power supply mode. Power P required by load at 100msoWhen mutation occurs, the system reaches steady state when mutation is changed from 1.3kW to 0.7kW (1.75A multiplied by 400V) and 107 ms. At this time, the photovoltaic array outputs power PpvStill 1kW, PpvGreater than PoAnd battery current iBChanging from 2.29A to-1.89A, the storage battery is in a charging state, and the system is in a photovoltaic simultaneous power supply mode for the storage battery and the load.
(2) Load power Po1kW, photovoltaic array output power PpvThe mutation from 0.7kW to 1.3 kW.
As shown in FIG. 6(b)Shown, before time 100ms, is battery current iBA value of 2.22A indicates that the battery is in a discharged state; and the photovoltaic array outputs power Ppv0.7kW (7A is multiplied by 100V), the power P required by the loado1kW (2.5 A.times.400V), PpvLess than Po(ii) a The system is in a photovoltaic and storage battery combined power supply mode. Photovoltaic array output power P at 100mspvThe mutation is generated, the mutation is from 0.7kW to 1.3kW (13A multiplied by 100V), and the system reaches a steady state at 111 ms. At this time, the load required power PoStill 1kW, PpvGreater than PoAnd battery current iBChanging from 2.22A to-1.85A shows that the storage battery is in a charging state, and the system is in a photovoltaic simultaneous power supply mode for the storage battery and the load.
The time for switching from the mode 1 to the mode 2 is only less than 11ms, and the voltage U of the photovoltaic array terminal is in the switching processpvThe overshoot of (2) is very low, which shows that the system has very good rapidity and smoothness.
There are two cases of switching from mode 2 to mode 1, and the simulation results are shown in fig. 7(a) to 7 (b):
(1) photovoltaic array output power Ppv1kW, load power PoMutation from 0.7kW to 1.3 kW.
As shown in FIG. 7(a), before the time of 100ms, the battery current iBA value of-1.89A indicates that the battery is in a charged state; and the photovoltaic array outputs power Ppv1kW (10A is multiplied by 100V), and the power P required by the loado0.7kW (1.75 A.times.400V), PpvGreater than PoThe system is in photovoltaic simultaneous supply mode to the battery and the load. 100ms, the power P required by the loadoThe mutation is generated, the mutation is from 0.7kW to 1.3kW (3.25A multiplied by 400V), and the system reaches a steady state at 106 ms. At this time, the photovoltaic array outputs power PpvStill 1kW, PpvLess than PoAnd battery current iBThe change from-1.89A to 2.29A shows that the storage battery is in a discharging state, and the system is in a photovoltaic and storage battery combined power supply mode.
(2) Load power Po1kW, photovoltaic array output power PpvThe mutation from 1.3kW to 0.7 kW.
As shown in FIG. 7(b), before the time of 100ms, the battery current iBA value of-1.85A indicates that the battery is in a charged state; and the photovoltaic array outputs power Ppv1.3kW (13A is multiplied by 100V), and the power P required by the loado1kW (2.5 A.times.400V), PpvGreater than PoThe system is in photovoltaic simultaneous supply mode to the battery and the load. Photovoltaic array output power P at 100mspvThe mutation is generated, the mutation is from 1.3kW to 0.7kW (7A multiplied by 100V), and the system reaches a steady state at 110 ms. At this time, the load required power PoStill 1kW, PpvLess than PoAnd battery current iBThe change from-1.85A to 2.22A shows that the storage battery is in a discharging state, and the system is in a photovoltaic and storage battery combined power supply mode.
The time for switching from the mode 2 to the mode 1 is only less than 10ms, and the voltage U of the photovoltaic array terminal is in the switching processpvThe overshoot of (2) is very low, which shows that the system has very good rapidity and smoothness.
From the simulation results, the three-port integrated photovoltaic energy storage converter provided by the invention can realize the maximum power output and the constant load voltage of the photovoltaic array by adopting a PWM + PFM hybrid modulation strategy, and the converter can reasonably distribute the power among the ports when the power of the photovoltaic array and the load changes, so that the mode switching is flexibly realized, and the stable and efficient operation of the system is ensured.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A three-port integrated photovoltaic energy storage converter having three ports connected to a photovoltaic array, a battery and a load, respectively, the converter comprising:
the first switch tube and the second switch tube are conducted complementarily, and the first inductor and the second inductor work in a DCM mode and a CCM mode respectively;
the positive electrode of the photovoltaic array is connected with the first end of the first inductor and the first end of the first capacitor, and the negative electrode of the photovoltaic array is connected with the second end of the first capacitor, the negative electrode of the storage battery, the second end of the second capacitor, the source electrode of the first switching tube, the second end of the third capacitor and the negative electrode of the load;
the positive electrode of the storage battery is connected with the first end of the second capacitor and the first end of the second inductor;
the second end of the first inductor is connected with the anode of the first diode and the anode of the second diode;
the cathode of the first diode is connected with the second end of the second inductor, the drain of the first switch tube and the source of the second switch tube;
the cathode of the second diode is connected with the drain of the second switching tube, the first end of the third capacitor and the anode of the load;
when the three-port integrated photovoltaic energy storage converter works in a photovoltaic and storage battery combined power supply mode, the three-port integrated photovoltaic energy storage converter works in three modes in one switching period:
mode 1: [t 0-t 1]
In thatt 0At the moment, the first switch tube is turned on, the second switch tube is turned off, the mode 1 starts, at the moment, the first diode is turned on, the second diode is turned off, the current of the first inductor starts to linearly increase from zero, and the current of the second inductor linearly increases;
mode 2: [t 1-t 2]
t 1At the moment, the first switch tube is turned off, the second switch tube is turned on, the mode 1 is ended, the mode 2 is started, at the moment, the first diode and the second diode are both conducted, and the current of the first inductor and the current of the second inductor are both linearly reduced;
modality 3: [t 2-t 3]
t 2At the moment, the current of the first inductor decreases to 0, the mode 2 ends, the mode 3 begins, at the moment, the second switch tube continues to be switched on, the first switch tube, the first diode and the second diode are all in a switch-off state, and the current of the second inductor continues to linearly decrease until the current reaches the point that the first switch tube, the first diode and the second diode are all in a switch-off statet 3At the moment, the first switching tube is switched on, the second switching tube is switched off, the mode 3 is finished, the next switching period begins, and the process is repeated;
when the three-port integrated photovoltaic energy storage converter works in a mode that the photovoltaic power supply is simultaneously used for supplying power to the storage battery and the load, the three-port integrated photovoltaic energy storage converter works in three modes in one switching period:
mode 1: [t 0-t 1]
In thatt 0At the moment, the first switch tube is switched on, the second switch tube is switched off, the first diode is switched on, the second diode is switched off, the current of the first inductor is linearly increased from zero, and the current of the second inductor is linearly decreased in a reverse direction;
mode 2: [t 1-t 2]
t 1At the moment, the first switch tube is turned off, the second switch tube is turned on, the mode 1 is ended, the mode 2 is started, at the moment, the first diode and the second diode are both conducted, the current of the first inductor is linearly reduced, and the current of the second inductor is linearly increased in a reverse direction;
modality 3: [t 2-t 3]
t 2At the moment, the current of the first inductor is reduced to 0, the mode 2 is ended, the mode 3 is started, and the second switch tubeThe first switch tube, the first diode and the second diode are in the off state, the current of the second inductor continuously increases in a reverse linear mode until the current reaches the end pointt 3And at the moment, the first switching tube is switched on, the second switching tube is switched off, the mode 3 is ended, the next switching period begins, and the process is repeated.
2. The three-port integrated photovoltaic energy storage converter of claim 1, wherein the first switching transistor and the second switching transistor are both MOS transistors.
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