CN210297273U - Household multi-micro-source integrated energy conversion device - Google Patents

Household multi-micro-source integrated energy conversion device Download PDF

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Publication number
CN210297273U
CN210297273U CN201921416286.6U CN201921416286U CN210297273U CN 210297273 U CN210297273 U CN 210297273U CN 201921416286 U CN201921416286 U CN 201921416286U CN 210297273 U CN210297273 U CN 210297273U
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energy conversion
switch tube
capacitor
switching tube
conversion unit
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劳志军
孙向东
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Xi'an Bowei New Energy Technology Co Ltd
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Xi'an Bowei New Energy Technology Co Ltd
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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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/10—Photovoltaic [PV]
    • 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
    • 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 utility model relates to a many little source integration energy conversion equipment of family formula, including centralized control ware, public DC bus and four energy conversion units. The energy conversion units are respectively a photovoltaic energy conversion unit, a retired battery energy conversion unit, a charging gun energy conversion unit and a single-phase alternating current power grid energy conversion unit. The photovoltaic energy conversion unit, the retired battery energy conversion unit, the charging gun energy conversion unit and the single-phase alternating-current power grid energy conversion unit are all connected with the public direct-current bus in parallel, and the centralized controller is electrically connected with the photovoltaic energy conversion unit, the retired battery energy conversion unit, the charging gun energy conversion unit and the single-phase alternating-current power grid energy conversion unit.

Description

Household multi-micro-source integrated energy conversion device
Technical Field
The utility model belongs to the technical field of power electronics, especially, relate to a many little source integration energy conversion device of family formula.
Background
With the development of green energy technology, a micro-grid system taking families as a unit and taking green renewable energy as a main body has a great deal of development. Since the photovoltaic array, the energy storage battery, the power battery of the electric vehicle and the like all output direct current, and household appliances such as an air conditioner, a washing machine, a refrigerator, an induction cooker, a television, a computer and the like can also be supplied with direct current, the direct current micro-grid system is certainly favored in the future.
The common direct current bus is used as a link, photovoltaic power generation, energy storage, an electric vehicle, an alternating current power grid and the like are organically combined through a power electronic converter to form a household multi-micro-source direct current micro-power grid, and the supply of direct current to user loads is one of key development directions in the future. At present, a household energy router is mostly composed of photovoltaic power generation, energy storage and an alternating current power grid, interaction between an electric automobile and a direct current micro-power grid is not considered, the electric automobile is a necessary vehicle for a household in the future, the interaction between the electric automobile and the direct current micro-power grid is significant for providing power supply reliability of the household direct current micro-power grid, and meanwhile, a special charging pile does not need to be installed, so that cost is reduced. With the gradual popularization of electric automobiles, a large number of power batteries can be retired in the future, and the echelon utilization of the retired power batteries is one of the best paths for reducing the cost of the energy storage system, so that the retired power batteries used in the energy storage system have good market prospects. The utility model discloses consider electric automobile and direct current little interdynamic and energy storage system between the electric wire netting and adopt retired power battery for the entire system function is various and hardware cost is controllable.
SUMMERY OF THE UTILITY MODEL
The utility model provides a technical problem be that electric automobile retired battery can't utilize, need not the special use fill electric pile to electric automobile direct current charge and the electric wire netting has a power failure family with load power supply can not use electric automobile power battery.
The utility model discloses a realize through following technical scheme:
a household multi-micro-source integrated energy conversion device is characterized in that: the system comprises an integrated controller, a common direct current bus and four energy conversion units.
The energy conversion units are respectively a photovoltaic energy conversion unit, a retired battery energy conversion unit, a charging gun energy conversion unit and a single-phase alternating current power grid energy conversion unit;
the photovoltaic energy conversion unit, the retired battery energy conversion unit, the charging gun energy conversion unit and the single-phase alternating-current power grid energy conversion unit are all connected with a common direct-current bus in parallel, and the centralized controller is electrically connected with the photovoltaic energy conversion unit, the retired battery energy conversion unit, the charging gun energy conversion unit and the single-phase alternating-current power grid energy conversion unit;
the photovoltaic energy conversion unit is formed by connecting a PV + wiring terminal, a PV-wiring terminal and a Buck-Boost combined Buck-Boost converter; the ex-service battery energy conversion unit is formed by connecting a BAT + wiring terminal and a BAT-wiring terminal with a Buck-Boost bidirectional half-bridge converter; the charging gun energy conversion unit is formed by connecting an EV + wiring terminal and an EV-wiring terminal with a double-active full-bridge converter; the single-phase alternating current power grid energy conversion unit is formed by connecting an A wiring terminal and an N wiring terminal with a high-frequency isolation type bidirectional AC-DC converter through a normally open contact JCQ;
as a further explanation of the utility model: Buck-Boost combination Buck-Boost converter includes fuse1, and fuse1 input is connected with PV + binding post, and fuse1 output electric energy stores in condenser C1In the capacitor C1The output passes through a switch tube S1And diode D1Parallel connected, diode D1The output passes through the inductor L1And a switching tube S2Parallel connection, switch tube S2The output passes through a diode D2And a capacitor C2Parallel connected, capacitor C2Electrically connected to a common dc bus.
As a further explanation of the utility model: the Buck-Boost bidirectional half-bridge converter comprises a capacitor C3Switch tube S3Switch tube S4Inductor L2Inductor L3Capacitor C4Capacitor C5And fuse 2; the capacitor C3Through a switching tube S3And a switching tube S4Parallel connection, switch tube S4Via an inductor L2And a capacitor C4Parallel connected, capacitor C4Via an inductor L3And fuse2 and capacitor C5Parallel connected, capacitor C5Connected with the BAT + connecting terminal and the connecting terminal BAT-.
As a further explanation of the utility model: the dual-active full-bridge converter comprises a capacitor C8Inductor L5Fuse3, capacitor C7Inductor L4Switch tube S5Switch tube S6Switch tube S7Switch tube S8Switch tube S9Switch tube S10Switch tube S11Switch tube S12High frequency transformer T1And a capacitor C6(ii) a The capacitor C6Is connected in parallel to the switching tube S5And a switching tube S6A series circuit; switch tube S5And a switching tube S6The series circuit formed is connected in parallel with the switch tube S7And a switching tube S8Forming a series circuit, switching tube S5And a switching tube S7The output end of the high-frequency transformer T1 is electrically connected with one end of the high-frequency transformer T1; the capacitor C8Via an inductor L4And fuse3 and capacitor C7Parallel connected, capacitor C7Via an inductor L4And a switching tube S12And a switching tube S11The formed series circuits are connected in parallel; switch tube S12And a switching tube S11The series circuit formed is connected in parallel with the switch tube S9And a switching tube S10A series circuit; switch tube S11And a switching tube S9The output terminals of the first and second switches are electrically connected.
As a further explanation of the utility model: the high-frequency isolation type bidirectional AC-DC converter consists of a front-stage AC-DC converter and a rear-stage double-active-bridge converter two-stage circuit; the front-stage AC-DC converter is electrically connected with the rear-stage double-active-bridge converter.
As a further explanation of the utility model: the front-stage AC-DC converter is composed of an input filter capacitor C9Filter inductor L6Switch tube S13Switch tube S14Switch tube S15Switch tube S16And a capacitor C10Composition of(ii) a The switch tube S13And a switching tube S14The series circuit formed is connected in parallel with the switch tube S15And a switching tube S16A series circuit; switch tube S13Output end passes through L6And a capacitor C9One end is electrically connected, S15Output terminal and capacitor C9The other end is electrically connected.
As a further explanation of the utility model: : the rear-stage double-active-bridge converter comprises a switch tube S17Switch tube S18Switch tube S19Switch tube S20High frequency transformer T2Switch tube S21Switch tube S22Switch tube S23Switch tube S24And a filter inductance L7And a capacitor C11A DC terminal + and a DC terminal-are provided; the capacitor C10Is connected in parallel to the switching tube S17And a switching tube S18A series circuit; switch tube S17And a switching tube S18The series circuit formed is connected in parallel with the switch tube S19And a switching tube S20Forming a series circuit, switching tube S17And a switching tube S19Output terminal and high-frequency transformer T2One end is electrically connected; the capacitor C11Through a filter inductor L7And a switching tube S23And a switching tube S24The formed series circuits are connected in parallel; switch tube S23And a switching tube S24The series circuit formed is connected in parallel with the switch tube S21And a switching tube S22A series circuit; switch tube S21And a switching tube S23Output terminal and high-frequency transformer T2And (6) electrically connecting.
As a further explanation of the utility model: the centralized controller has three control modes, including a normal power supply mode of a single-phase alternating-current power grid, a power failure mode of the single-phase alternating-current power grid and a smooth switching mode between the normal power supply mode of the single-phase alternating-current power grid and the power failure mode of the single-phase alternating-current power grid.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses can carry out photovoltaic energy conversion, retired battery energy conversion, rifle energy conversion and the single phase AC electric wire netting energy conversion that charges and utilize through public DC bus and centralized control ware management and control. And has a variation of three switching modes. The efficient organic comprehensive utilization of multiple micro sources can be realized, and the echelon utilization of the retired battery of the electric automobile can also be realized; a special charging pile is not required to be installed, direct current charging of the electric automobile is achieved, and meanwhile, a power battery of the electric automobile can be used for supplying power to a household load when a power grid is powered off; and grid-connected or off-grid switching operation can be realized. The interaction between the electric automobile and the direct-current micro-grid is considered, the use of retired power batteries and various working modes during grid connection and grid disconnection are considered, and therefore the whole system is diversified in functions and controllable in hardware cost.
Drawings
Fig. 1 is a schematic structural view of a household multi-micro-source integrated energy conversion device of the present invention;
fig. 2 is a circuit diagram of a buck-boost DC-DC converter for photovoltaic power generation according to the present invention;
fig. 3 is a circuit diagram of a Buck-Boost bidirectional half-bridge converter for interaction between a retired power battery and a common dc bus according to the present invention;
fig. 4 is a control block diagram of the present invention for charging the retired power battery by the mode-time Buck-Boost bidirectional half-bridge converter;
fig. 5 is a control block diagram of the present invention for realizing energy interaction between the retired power battery and the common dc bus based on the Buck-Boost bidirectional half-bridge converter in the second mode;
fig. 6 is a circuit diagram of a high frequency isolated dual active bridge converter for docking an electric vehicle according to the present invention;
fig. 7 is a control block diagram of the dual active bridge converter for mode-time high frequency isolation to charge the power battery of the electric vehicle of the present invention;
fig. 8 is a control block diagram of the present invention for implementing energy interaction between the power battery of the electric vehicle and the common dc bus by using the dual active bridge converter based on high frequency isolation in the mode two;
fig. 9 is a circuit diagram of a high frequency isolated single phase two stage AC-DC bidirectional converter for interfacing a single phase AC power grid to an AC load according to the present invention;
fig. 10 is a control block diagram of the present invention for a mode-time preceding stage AC-DC converter;
fig. 11 is a control block diagram for a mode-time post-stage dual active bridge converter of the present invention;
fig. 12 is a control block diagram of the pre-stage AC-DC converter for mode two of the present invention;
fig. 13 is a control block diagram for the mode two time post stage dual active bridge converter of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a household multi-micro-source integrated energy conversion device, which comprises an integrated controller, a common direct-current bus and four energy conversion units. The external terminal of the common direct current bus is DC + or DC-. In the implementation of the photovoltaic energy conversion unit, the external photovoltaic array is connected to the buck-boost DC-DC converter through the connecting terminals PV + and PV-, and is connected to the positive pole and the negative pole of the common direct current bus through the buck-boost DC-DC converter. The retired battery energy conversion unit is used for connecting a lead-acid storage battery or a lithium battery retired from the electric automobile to the Buck-Boost bidirectional half-bridge converter through the wiring terminals BAT + and BAT-, and is connected to the positive pole and the negative pole of the public direct-current bus through the Buck-Boost bidirectional half-bridge converter; the charging gun energy conversion unit needs the electric automobile to be connected to a high-frequency isolated double-active-bridge converter through EV + and EV-terminals of a direct-current charging gun and to be connected to a common direct-current bus plus and minus poles through the double-active-bridge converter. The single-phase alternating current power grid is connected with the high-frequency isolation single-phase two-stage AC-DC bidirectional converter through a wiring terminal A, N through a normally open contact JCQ of the contactor, and is connected to the positive and negative poles of the public direct current bus through the high-frequency isolation single-phase two-stage AC-DC bidirectional converter. The household direct current load is directly connected with the + and-poles of the common direct current bus through the DC + and DC-terminals; the household alternating current load is connected to the high-frequency isolation single-phase two-stage AC-DC bidirectional converter through the wiring terminals A1 and N1. The whole system realizes centralized control of various converters by one centralized controller, and assumes that the reference voltage Udc-ref of the common direct current bus is 375V, the upper limit of the reference voltage is 400V, and the lower limit of the reference voltage is 350V. There are three modes of operation:
the first implementation mode is as follows: and (5) normal power supply mode of the single-phase alternating current power grid.
The public direct current bus is connected with a direct current load through a wiring terminal DC + and a DC-to supply power for the direct current load; the centralized controller controls the normally open contact JCQ of the contactor to be sucked, so that the single-phase alternating current power grid supplies power for the alternating current load. The external photovoltaic array realizes maximum power point tracking through the buck-boost DC-DC converter and injects current into the common direct current bus. The retired power battery (such as a lead-acid storage battery or a lithium battery) obtains energy from a common direct-current bus through the Buck-Boost bidirectional half-bridge converter for charging, and if the retired power battery is fully charged, the Buck-Boost bidirectional half-bridge converter stops working. And if the electric automobile is connected to the high-frequency isolated double-active-bridge converter through the charging gun, charging the power battery of the electric automobile, and when the electric automobile is fully charged, stopping the high-frequency isolated double-active-bridge converter. The stable control of the voltage of the public direct current bus is realized by a high-frequency isolation single-phase two-stage AC-DC bidirectional converter. When the voltage of the public direct-current bus is greater than the upper limit of the reference voltage, the high-frequency isolation single-phase two-stage AC-DC bidirectional converter works in an inversion state, and redundant energy of the public direct-current bus is fed back to a power grid; when the voltage of the public direct-current bus is smaller than the lower limit of the reference voltage, the high-frequency isolation single-phase two-stage AC-DC bidirectional converter works in a rectification state, energy is injected into the public direct-current bus through a power grid, and the voltage of the public direct-current bus is in a specified range.
The second implementation mode is as follows: single phase ac grid power down mode.
The public direct current bus is connected with a direct current load through a DC + and DC-wiring terminal to supply power to the direct current load; the centralized controller controls the normally open contact JCQ of the contactor to be released and disconnected, the high-frequency isolation single-phase two-stage AC-DC bidirectional converter works in an inversion state, and sinusoidal alternating voltage (for example, alternating voltage with effective value of 198V-220V/frequency of 50 Hz) meeting the power quality requirement is provided for an alternating current load. The external photovoltaic array realizes maximum power point tracking through the buck-boost DC-DC converter and injects current into the common direct current bus. The retired power battery is preferentially used for charging and discharging through the Buck-Boost bidirectional half-bridge converter to achieve stable control of the voltage of the public direct current bus, and when the voltage of the public direct current bus exceeds the upper limit of the reference voltage, if the electric automobile is connected to the system, the electric automobile is charged, so that the voltage of the public direct current bus returns to the specified range. If the power battery of the electric automobile is fully charged or no electric automobile is connected, the external photovoltaic array limits power output through the buck-boost DC-DC converter, so that the voltage of the public direct current bus returns to a specified range. When the voltage of the public direct current bus is lower than the lower limit of the reference voltage, if the electric automobile is connected to the system, the power battery of the electric automobile discharges through the Buck-Boost bidirectional half-bridge converter, and the voltage of the public direct current bus returns to the specified range. If the electric quantity of the power battery of the electric automobile is insufficient, the high-frequency isolation single-phase two-stage AC-DC bidirectional converter is stopped to work, the AC load is cut off, and if the voltage of the public DC bus is still lower than the lower limit of the reference voltage, the whole system stops running.
The third implementation mode: and a smooth switching mode between the normal power supply mode of the single-phase alternating-current power grid and the power failure mode of the single-phase alternating-current power grid.
When the centralized controller detects that the voltage of the single-phase alternating current power grid disappears, the normally open contact JCQ of the contactor is immediately controlled to be released and disconnected, the connection with the alternating current power grid is cut off, the high-frequency isolation single-phase two-stage AC-DC bidirectional converter is converted into an inversion working state, and sine alternating current load voltage meeting the power quality requirement is output to supply power to the alternating current load; and simultaneously, the retired power battery is immediately discharged through the Buck-Boost bidirectional half-bridge converter to stabilize the voltage of the common direct-current bus. And after the processing is finished, switching to a single-phase alternating current power grid power-off mode.
When the integrated controller detects that the single-phase alternating current power grid recovers normal power supply, the high-frequency isolation single-phase two-stage AC-DC bidirectional converter stops working immediately, and the integrated controller controls the normally open contact JCQ of the contactor to be attracted, so that the single-phase alternating current power grid supplies power for the alternating current load. And after the processing is finished, switching to a normal power supply mode of the single-phase alternating-current power grid.
Fig. 2 is a circuit diagram of the buck-boost DC-DC converter for photovoltaic power generation of the present invention. As an embodiment technical scheme, the buck-boost DC-DC converter comprises a connecting terminal PV +, a PV-, a fuse1 and an input capacitor C1Switch tube S1Diode D1Inductor L1Switch tube S2Diode D2And a capacitor C2And (4) forming. The Buck-Boost combined Buck-Boost converter is characterized in that the input end of the fuse1 is connected with a PV + wiring terminal, and the fuse1 outputs electric energy to be stored in a capacitor C1In the capacitor C1The output passes through a switch tube S1And diode D1Parallel connected, diode D1The output passes through the inductor L1And a switching tube S2Parallel connection, switch tube S2The output passes through a diode D2And a capacitor C2Parallel connected, capacitor C2Electrically connected to a common dc bus. In the implementation, the input voltage is set as a photovoltaic array voltage UPV, the output voltage is a common direct current bus voltage Udc-bus, the duty ratio of the switching tube is duty1, and according to the formula (1), if the switching tube S is controlled at the same time1And a switching tube S2And switching on and off, the voltage boosting and reducing capacity can be obtained. When 0.5<duty1<1, boosting by the DC-DC converter; when 0 is present<duty1<The DC-DC converter performs voltage reduction at 0.5 hour; when duty1 is 0.5, the output voltage of the DC-DC converter is equal to the input voltage. The control system collects the voltage UPV and the current IPV of the photovoltaic array through classical disturbanceThe duty1 is obtained by the observation method, so that the photovoltaic array is controlled to work in the maximum power point tracking state.
Figure 3 is the utility model discloses a two-way half-bridge converter circuit diagram of Buck-Boost that is used for between retired power battery and public DC bus interactive. As the technical scheme of the embodiment, the Buck-Boost bidirectional half-bridge converter is composed of wiring terminals BAT +, BAT-and a capacitor C3Switch tube S3、S4Inductor L2、L3Capacitor C4、C5And fuse 2. Capacitor C3Through a switching tube S3And a switching tube S4Parallel connection, switch tube S4Via an inductor L2And a capacitor C4Parallel connected, capacitor C4Via an inductor L3And fuse2 and capacitor C5Parallel connected, capacitor C5Connected with the BAT + connecting terminal and the connecting terminal BAT-.
To under the implementation mode state, figure 4 is the utility model discloses a control block diagram that is used for two-way half-bridge converter of Buck-Boost to retired power battery charging for one time of mode, its working process: estimating the state of charge of the retired power battery by the centralized controller to obtain a reference current Ibat-ref, subtracting the actual current Ibat of the retired power battery from the reference current Ibat-ref, regulating the difference by the PI regulator 1, comparing the obtained output with a triangular carrier by a comparator to obtain a switching tube S3Control signal BAT-PWM, switching tube S4And the work is forbidden, and the retired power battery is charged.
To the implementation mode two, fig. 5 is a control block diagram for realizing energy interaction between a retired power battery and a public direct current bus based on a Buck-Boost bidirectional half-bridge converter in the mode two, and the working process is as follows: the power battery (such as lead-acid battery or lithium battery) retired from the electric automobile is connected to BAT +, BAT-terminal, and the capacitor C3Connected in parallel with a common dc bus. The reference voltage of the public direct current bus is set as Udc-ref, the difference value of the actual voltage Udc-bus of the public direct current bus minus Udc-ref is acted by the PI regulator 2 to obtain the reference current Ibat-ref of the retired power battery, the actual current Ibat of the retired power battery is subtracted from the Ibat-ref, and the difference isAnd regulating by a PI regulator 3, and comparing the obtained output with a triangular carrier by a comparator to obtain a switching tube control signal BAT-PWM. The charge and discharge judgment module judges the working state of the Buck-Boost bidirectional half-bridge converter according to the difference value obtained by subtracting the Udc-ref from the Udc-bus, when the difference value is larger than zero, the Buck-Boost bidirectional half-bridge converter works in a charging state, and the BAT-PWM signal controls the switching tube S3Switching tube S4Forbidding work; when the difference value is less than zero, the Buck-Boost bidirectional half-bridge converter works in a discharging state, and the BAT-PWM signal controls the switch tube S4Switching tube S3Forbidding work; and when the difference value is equal to zero, the Buck-Boost bidirectional half-bridge converter stops working.
For the third implementation mode, the working process is as follows: when the centralized controller detects that the voltage of the single-phase alternating-current power grid disappears, the retired power battery enters the working process of a mode two through the action of the Buck-Boost bidirectional half-bridge converter; and when the integrated controller detects that the single-phase alternating-current power grid recovers normal power supply, the retired power battery enters the working process of the first mode through the action of the Buck-Boost bidirectional half-bridge converter.
Fig. 6 is a circuit diagram of the high frequency isolated dual active bridge converter for docking an electric vehicle according to the present invention. As an embodiment technical scheme, the high-frequency isolated double-active-bridge converter is composed of terminals EV +, EV and a capacitor C8Inductor L5Fuse3, capacitor C7Inductor L4Switch tube S5Switch tube S6Switch tube S7Switch tube S8Switch tube S9Switch tube S10Switch tube S11Switch tube S12High frequency transformer T1And a capacitor C6And (4) forming. The circuit structure is as follows; capacitor C6Is connected in parallel to the switching tube S5And a switching tube S6A series circuit; switch tube S5And a switching tube S6The series circuit formed is connected in parallel with the switch tube S7And a switching tube S8Forming a series circuit, switching tube S5And a switching tube S7Output terminal and high-frequency transformer T1One end is electrically connected; capacitor C8Via an inductor L4And fuse3 and capacitor C7Parallel connected, capacitor C7Via an inductor L4And a switching tube S12And a switching tube S11The formed series circuits are connected in parallel; switch tube S12And a switching tube S11The series circuit formed is connected in parallel with the switch tube S9And a switching tube S10A series circuit; switch tube S11And a switching tube S9The output terminals of the first and second switches are electrically connected. Wherein S is5To S12The control signals of the eight power switching tubes are all 50% duty ratio, and the switching tube S5And S8Are the same, switch tube S6And S7Are the same, switch tube S9And S12Are the same, switch tube S10And a switching tube S11The control signals of (3) are the same. Switch tube S5And S8Control signal and switch tube S6And S7The control signal logic of (1) is opposite, the switch tube S9And S12Is identical with the switching tube S10And S11The control signals of (1) are opposite in logic.
To the implementation mode one, fig. 7 is a control block diagram of the utility model for the mode is one time the control block diagram that two active bridge converters of high frequency isolation charge electric automobile power battery, its working process: the method comprises the steps that a power battery reference current IEV-ref is given by an electric vehicle battery management system BMS, the IEV-ref is different from a power battery actual current IEV, the difference is adjusted by a PI (proportional-integral) regulator 4 to obtain a phase shift coefficient d1 of a high-frequency isolated double-active-bridge converter, a single-phase shift control mode is adopted, and a switching tube S is obtained by multiplying a d1 switching period Ts with a 1/2 switching period Ts5And S8Leading switch tube S9And S12Thereby controlling the phase shift time of S5To S12And the eight switching tubes act to charge the power battery of the electric automobile. When the electric automobile is fully charged, the high-frequency isolated double-active-bridge converter stops working.
For the second embodiment, fig. 8 is a control block diagram of the present invention for realizing energy interaction between the power battery of the electric vehicle and the common dc bus by using the dual active bridge converter based on high frequency isolation in the second embodiment,the working process is as follows: the difference value of the actual voltage Udc-bus of the public direct current bus minus Udc-ref is acted by a PI regulator 5 to obtain the reference current IEV-ref of the power battery of the electric automobile, the difference is made between the IEV-ref and the actual current IEV of the power battery, the phase shift coefficient d2 of the high-frequency isolated double-active-bridge converter is obtained by regulating by the PI regulator 6, a single-phase shift control mode is adopted, and the switching tube S is obtained by multiplying the switching period Ts of d2 and 1/25And S8Lead (in this case Udc-bus)>Udc-ref, charging electric vehicles) or hysteresis (in which case Udc-bus<Udc-ref, electric car discharging to common dc bus) switching tube S9And S12Thereby controlling the phase shift time of S5To S12And the eight switching tubes act to charge or discharge the power battery of the electric automobile. This is the process by which the electric vehicle interacts with the common dc bus.
For the third implementation mode, the working process is as follows: and whether the centralized controller detects that the voltage of the single-phase alternating-current power grid disappears or the normal power supply is recovered, the high-frequency isolated double-active-bridge converter stops working firstly, and after the transition process is finished, the converter enters a corresponding mode I or mode II according to the current system working mode.
Fig. 9 is a circuit diagram of a high-frequency isolated single-phase two-stage AC-DC bidirectional converter for interfacing a single-phase AC power grid with an AC load according to the present invention. As the technical scheme of the embodiment, the high-frequency isolation single-phase two-stage AC-DC bidirectional converter consists of a front-stage AC-DC converter and a rear-stage double-active-bridge converter two-stage circuit. The front-stage AC-DC converter consists of AC terminals A1 and N1, and input filter capacitor C9Filter inductor L6Full-bridge converter switch tube S13、S14、S15、S16And a capacitor C10Composition, Upn-bus is a capacitor C10The voltage across. Switch tube S13And a switching tube S14The series circuit formed is connected in parallel with the switch tube S15And a switching tube S16A series circuit; switch tube S13Output end passes through L6And a capacitor C9One end is electrically connected, S15Output terminal and capacitor C9The other end is electrically connected.
The rear-stage double-active-bridge converter is composed of a switch tube S17、S18、S19、S20High frequency transformer T2Switch tube S21Switch tube S22Switch tube S23Switch tube S24And a filter inductor L7, a capacitor C11, and a DC terminal +, -are formed. Capacitor C10Is connected in parallel to the switching tube S17And a switching tube S18A series circuit; switch tube S17And a switching tube S18The series circuit formed is connected in parallel with the switch tube S19And a switching tube S20Forming a series circuit, switching tube S17And a switching tube S19Output terminal and high-frequency transformer T2One end is electrically connected; the capacitor C11Through a filter inductor L7And a switching tube S23And a switching tube S24The formed series circuits are connected in parallel; switch tube S23And a switching tube S24The series circuit formed is connected in parallel with the switch tube S21And a switching tube S22A series circuit; switch tube S21And a switching tube S23Output terminal and high-frequency transformer T2And (6) electrically connecting.
Wherein S is17To S24The control signals of the eight power switching tubes are all 50% duty ratio, and the switching tube S17And S20Are the same, switch tube S18And S19Are the same, switch tube S21And S24Are the same, switch tube S22And S23The control signals of (3) are the same. Switch tube S17And S18Control signal and switch tube S18And S19The control signal logic of (1) is opposite, the switch tube S21And S24Is identical with the switching tube S22And S23The control signals of (1) are opposite in logic. Suppose a capacitance C10The DC reference voltage Upn-ref of the transformer is 400V.
As for the first implementation mode, fig. 10 is a control block diagram of the AC-DC converter of the first preceding stage in mode of the present invention, and its working process: for the preceding-stage AC-DC converter, collecting a power grid voltage UAN signal, and performing digital phase-locked loop processing on the acquired power grid voltage UAN signal to obtain an AC-DC converterThe power grid voltage UAN is synchronized with the phase signal theta to obtain the sine signal sin theta. The acquired capacitor C is subtracted from the set capacitor C10 voltage reference signal Upn-ref10The difference between the two ends of the direct current voltage Upn-bus signals is multiplied by an output signal obtained after the difference is processed by the PI regulator 7 and sin theta is multiplied to obtain a grid side current reference signal iAN1-ref, a iAN1-ref current reference signal and a subtracted collected inductor L6The difference between the current signals iAN1 is compared with the triangular carrier signal to obtain the switch tube S13And S16The switching signal is subjected to logic negation operation to obtain a switching tube S14And S15The switching signal of (2). When Upn-bus<Upn-ref, single-phase AC network directional capacitor C10Supplementing energy; when Upn-bus>Upn-ref, capacitance C10Energy is injected into the single-phase alternating current power grid, so that the single-phase alternating current power grid and the capacitor C are realized10Exchange energy between the two.
Fig. 11 is a control block diagram for a mode-time post-stage dual active bridge converter according to the present invention. For the rear-stage double-active-bridge converter, the collected direct-current bus voltage Udc-bus subtracts the set direct-current bus reference voltage Udc-ref, and the difference is processed by the PI regulator 8 to obtain the inductance L7Current reference signal idc-ref, idc-ref minus the picked inductance L7After the current idc and the difference thereof pass through the PI regulator 9, the phase shift coefficient d3 of the high-frequency isolated double-active-bridge converter is obtained, and the switching tube S is obtained by multiplying the switching period Ts of d3 and 1/2 in a single-phase-shift control mode17And S20Lead (in this case Udc-bus)<Udc-ref, capacitance C10Injecting power into the common dc bus) or hysteresis (in which case Udc-bus>Udc-ref, common dc bus directional capacitance C10Injected with electrical energy) switching tube S21And S24Thereby controlling the phase shift time of S17To S24Eight switching tubes are operated to realize a capacitor C10And energy is transmitted between the bus and the common direct current bus.
For the second embodiment, fig. 12 is a control block diagram of the preceding stage AC-DC converter in the second embodiment, and its working process: for preceding stage AC-DC converters, rootSetting AC load voltage reference signal UAN1-ref, UAN1-ref signal minus collected AC load voltage UAN1 signal according to power frequency grid voltage amplitude and frequency requirement, and obtaining inductance L by the difference through proportional resonance controller6The reference signal iAN1-ref, iAN1-ref of the current minus the picked-up inductance L6The difference between the current signals iAN1 is compared with the output signal obtained by the proportional regulator 2 to obtain the switch tube S13And S16The switching signal is subjected to logic negation operation to obtain a switching tube S14And S15To realize the capacitor C10And in the inversion process of the AC load, the sinusoidal AC load voltage meeting the power quality requirement is obtained.
Fig. 13 is a control block diagram for a mode two time post stage dual active bridge converter of the present invention. For the post-stage double-active bridge converter, the set capacitance C10Subtracting the collected capacitance C from the reference voltage Upn-ref10The difference between the two end voltages Upn-bus is processed by the PI regulator 10 to obtain the inductance L7Current reference signal idc-ref, idc-ref signal minus inductance L7The difference of the currents idc is subjected to PI regulator 11 to obtain a phase shift coefficient d4 of the high-frequency isolated double-active-bridge converter, and a switching tube S is obtained by multiplying a switching period Ts of d4 and 1/2 in a single-phase-shift control mode17And S20Hysteresis switch tube S21And S24Thereby controlling the phase shift time of S17To S24Eight switching tubes act to realize a common DC bus directional capacitor C10Energy is injected so that the capacitance C10The voltage Upn-bus reaches the reference voltage Upn-ref.
For the third implementation mode, the working process is as follows: when the centralized controller detects that the voltage of the single-phase alternating current power grid disappears, the normally open contact JCQ of the contactor is immediately controlled to be released and disconnected, the contactor is cut off and connected with the alternating current power grid, the high-frequency isolation single-phase two-stage AC-DC bidirectional converter is converted into an inversion working state according to the working mode of the mode II, the sinusoidal alternating current load voltage meeting the power quality requirement is output, and power is supplied to the alternating current load.
When the integrated controller detects that the single-phase alternating-current power grid recovers normal power supply, the high-frequency isolation single-phase two-stage AC-DC bidirectional converter stops working immediately, the integrated controller controls the normally-open contact JCQ of the contactor to be sucked, the single-phase alternating-current power grid supplies power for an alternating-current load, and then the high-frequency isolation single-phase two-stage AC-DC bidirectional converter works according to the working mode of the mode one.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The embodiments given above are preferred examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical features of the technical solution of the present invention by those skilled in the art all belong to the protection scope of the present invention.

Claims (8)

1. A household multi-micro-source integrated energy conversion device is characterized in that: the system comprises an integrated controller, a common direct current bus and four energy conversion units;
the energy conversion units are respectively a photovoltaic energy conversion unit, a retired battery energy conversion unit, a charging gun energy conversion unit and a single-phase alternating current power grid energy conversion unit;
the photovoltaic energy conversion unit, the retired battery energy conversion unit, the charging gun energy conversion unit and the single-phase alternating-current power grid energy conversion unit are all connected with a common direct-current bus in parallel, and the centralized controller is electrically connected with the photovoltaic energy conversion unit, the retired battery energy conversion unit, the charging gun energy conversion unit and the single-phase alternating-current power grid energy conversion unit;
the photovoltaic energy conversion unit is formed by connecting a PV + wiring terminal, a PV-wiring terminal and a Buck-Boost combined Buck-Boost converter; the ex-service battery energy conversion unit is formed by connecting a BAT + wiring terminal and a BAT-wiring terminal with a Buck-Boost bidirectional half-bridge converter; the charging gun energy conversion unit is formed by connecting an EV + wiring terminal and an EV-wiring terminal with a double-active full-bridge converter; the single-phase alternating current power grid energy conversion unit is formed by connecting an A wiring terminal and an N wiring terminal with a high-frequency isolation type bidirectional AC-DC converter through a normally open contact JCQ.
2. The household multi-micro-source integrated energy conversion device according to claim 1, characterized in that: Buck-Boost combination Buck-Boost converter includes fuse1, and fuse1 input is connected with PV + binding post, and fuse1 output electric energy stores in condenser C1In the capacitor C1The output passes through a switch tube S1And diode D1Parallel connected, diode D1The output passes through the inductor L1And a switching tube S2Parallel connection, switch tube S2The output passes through a diode D2And a capacitor C2Parallel connected, capacitor C2Electrically connected to a common dc bus.
3. The household multi-micro-source integrated energy conversion device according to claim 1, characterized in that: the Buck-Boost bidirectional half-bridge converter comprises a capacitor C3Switch tube S3Switch tube S4Inductor L2Inductor L3Capacitor C4Capacitor C5And fuse 2; the capacitor C3Through a switching tube S3And a switching tube S4Parallel connection, switch tube S4Via an inductor L2And a capacitor C4Parallel connected, capacitor C4Via an inductor L3And fuse2 and capacitor C5Parallel connected, capacitor C5Connected with the BAT + connecting terminal and the connecting terminal BAT-.
4. The household multi-micro-source integrated energy conversion device according to claim 1, characterized in that: the dual-active full-bridge converter comprises a capacitor C8Inductor L5Fuse3, capacitor C7Inductor L4Switch tube S5Switch tube S6Switch tube S7And openerClosing pipe S8Switch tube S9Switch tube S10Switch tube S11Switch tube S12High frequency transformer T1And a capacitor C6(ii) a The capacitor C6Is connected in parallel to the switching tube S5And a switching tube S6A series circuit; switch tube S5And a switching tube S6The series circuit formed is connected in parallel with the switch tube S7And a switching tube S8Forming a series circuit, switching tube S5And a switching tube S7Output terminal and high-frequency transformer T1One end is electrically connected; the capacitor C8Via an inductor L4And fuse3 and capacitor C7Parallel connected, capacitor C7Via an inductor L4And a switching tube S12And a switching tube S11The formed series circuits are connected in parallel; switch tube S12And a switching tube S11The series circuit formed is connected in parallel with the switch tube S9And a switching tube S10A series circuit; switch tube S11And a switching tube S9The output terminals of the first and second switches are electrically connected.
5. The household multi-micro-source integrated energy conversion device according to claim 1, characterized in that: the high-frequency isolation type bidirectional AC-DC converter consists of a front-stage AC-DC converter and a rear-stage double-active-bridge converter two-stage circuit; the front-stage AC-DC converter is electrically connected with the rear-stage double-active-bridge converter.
6. The household multi-micro-source integrated energy conversion device according to claim 5, characterized in that: the front-stage AC-DC converter is composed of an input filter capacitor C9Filter inductor L6Switch tube S13Switch tube S14Switch tube S15Switch tube S16And a capacitor C10Composition is carried out; the switch tube S13And a switching tube S14The series circuit formed is connected in parallel with the switch tube S15And a switching tube S16A series circuit; switch tube S13Output end passes through L6And a capacitor C9One end is electrically connected, S15Output terminal and capacitor C9The other end is electrically connected.
7. The household multi-micro-source integrated energy conversion device according to claim 5, characterized in that: the rear-stage double-active-bridge converter comprises a switch tube S17Switch tube S18Switch tube S19Switch tube S20High frequency transformer T2Switch tube S21Switch tube S22Switch tube S23Switch tube S24And a filter inductance L7And a capacitor C11A DC terminal + and a DC terminal-are provided; the capacitor C10Is connected in parallel to the switching tube S17And a switching tube S18A series circuit; switch tube S17And a switching tube S18The series circuit formed is connected in parallel with the switch tube S19And a switching tube S20Forming a series circuit, switching tube S17And a switching tube S19Output terminal and high-frequency transformer T2One end is electrically connected; the capacitor C11Through a filter inductor L7And a switching tube S23And a switching tube S24The formed series circuits are connected in parallel; switch tube S23And a switching tube S24The series circuit formed is connected in parallel with the switch tube S21And a switching tube S22A series circuit; switch tube S21And a switching tube S23Output terminal and high-frequency transformer T2And (6) electrically connecting.
8. The household multi-micro-source integrated energy conversion device according to claim 1, characterized in that: the centralized controller has three control modes, including a normal power supply mode of a single-phase alternating-current power grid, a power failure mode of the single-phase alternating-current power grid and a smooth switching mode between the normal power supply mode of the single-phase alternating-current power grid and the power failure mode of the single-phase alternating-current power grid.
CN201921416286.6U 2019-08-28 2019-08-28 Household multi-micro-source integrated energy conversion device Active CN210297273U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113890035A (en) * 2021-09-28 2022-01-04 燕山大学 Multi-mode unified control method based on series-parallel electric energy router
CN117936965A (en) * 2024-03-22 2024-04-26 深圳市杰成镍钴新能源科技有限公司 Energy control method and device for retired lithium battery discharging system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113890035A (en) * 2021-09-28 2022-01-04 燕山大学 Multi-mode unified control method based on series-parallel electric energy router
CN117936965A (en) * 2024-03-22 2024-04-26 深圳市杰成镍钴新能源科技有限公司 Energy control method and device for retired lithium battery discharging system

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