CN113725928B - Household alternating current-direct current hybrid bidirectional electric energy interaction energy router and energy scheduling method - Google Patents

Household alternating current-direct current hybrid bidirectional electric energy interaction energy router and energy scheduling method Download PDF

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CN113725928B
CN113725928B CN202111002330.0A CN202111002330A CN113725928B CN 113725928 B CN113725928 B CN 113725928B CN 202111002330 A CN202111002330 A CN 202111002330A CN 113725928 B CN113725928 B CN 113725928B
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full
voltage
conversion unit
energy
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CN113725928A (en
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孙秋野
孙城皓
王睿
马大中
孙振奥
段子豪
王鹏程
曹星辰
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东北大学
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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
    • H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/242—Home appliances

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a household alternating current-direct current hybrid bidirectional electric energy interaction energy router and an energy scheduling method, and belongs to the technical field of power electronics and intelligent power consumption management. The energy router comprises a single-phase full-bridge bidirectional interconnection conversion unit, a full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, a full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit, a full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, a first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit, a single-phase full-bridge inversion unit and a low-voltage direct current bus, has a bidirectional electric energy interaction function, can be simultaneously connected with various distributed energy sources, a single-phase alternating current power grid and household loads, and can provide low-voltage direct current and alternating current ports with various different safety voltage levels for household users; the energy scheduling method can adaptively adjust the working mode of the energy router according to the distributed energy power generation state and the household power demand, and can realize intelligent coordination distribution of household power based on the energy routing algorithm with the minimum cost.

Description

Household alternating current-direct current hybrid bidirectional electric energy interaction energy router and energy scheduling method
Technical Field
The invention belongs to the technical field of power electronics and intelligent power consumption management, and particularly relates to a household alternating current-direct current hybrid bidirectional electric energy interaction energy router and an energy scheduling method.
Background
Because of randomness and uncertainty of renewable energy power generation, one of the main problems faced by the energy internet at present is stability and absorption caused by high-permeability distributed renewable energy access, and an energy router is used as a core power electronic device for supporting the energy internet, and can control and coordinate energy, energy storage and load managed by the energy router.
The efficient utilization mode of the distributed renewable energy sources in the families is 'on-site collection, on-site storage and on-site use', the main utilization mode of the current distributed energy sources is still to access a power grid through various grid-connected converters, the energy conversion efficiency is low, the on-site consumption is difficult to realize, the electric energy quality of the power grid can be influenced, and the energy router taking the traditional solid-state transformer as a core is not attractive in the aspect of the consumption problem of the current highly distributed household energy sources; the household appliances are forward-direct-current and miniaturized, and due to the hardware topology limitation of the traditional energy router, the household appliances cannot provide alternating-current and direct-current mixed ports with various voltage levels for household users so as to meet the household electricity demand, and the bidirectional interaction of electric energy is difficult to realize; and because the traditional solid-state transformer has a single control mode, the problems that the optimal distribution of household electricity cannot be realized, the household electricity plan is difficult to meet and the electricity cost is reduced exist.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a household alternating current-direct current hybrid bidirectional electric energy interaction energy router and an energy scheduling method, wherein the energy router has the capability of being connected with various distributed energy sources and a single-phase alternating current power grid, has a bidirectional electric energy interaction function, can provide low-voltage direct current ports and alternating current ports with various safety voltage levels for household users, has electrical isolation among all ports, and can bypass a fault port when a single port fails to ensure that other ports are normally used; the energy router can also adaptively adjust the working mode of the energy router according to the distributed energy power generation state and the household demand, so that intelligent coordination and optimization distribution of household electricity consumption is realized, and the electricity consumption cost is reduced while the household electricity consumption plan is met.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention provides a household alternating current-direct current hybrid bidirectional electric energy interaction energy router, which comprises a single-phase full-bridge bidirectional interconnection conversion unit, a full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, a full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit, a full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, a first full-bridge SRC resonance soft switch Guan Shanxiang DC/DC conversion unit, a single-phase full-bridge inversion unit and a low-voltage direct current bus;
The input end of the single-phase full-bridge bidirectional interconnection conversion unit is connected with a household single-phase alternating current power grid, and the output end of the single-phase full-bridge bidirectional interconnection conversion unit is connected with the input end of the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit; the output end of the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus; the input end of the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit is connected with a photovoltaic assembly, and the output end of the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus; the input end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus, the first output end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit is connected with the energy storage module, and the second output end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit is connected with the direct-current load 1 with safe working voltage and the input end of the first full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit; the output end of the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit is connected with a direct-current load 2 with working voltage being safe voltage; the input end of the single-phase full-bridge inversion unit is connected with the low-voltage direct-current bus, and the output end of the single-phase full-bridge inversion unit is connected with an alternating-current load of single-phase alternating-current voltage for users; the working voltage of the direct current load 1 is larger than the working voltage of the direct current load 2;
The single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit cooperatively realize bidirectional electric energy interaction between a household single-phase alternating current power grid and a low-voltage direct current bus;
the full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit is used for realizing power conversion of converting direct-current voltage output by the photovoltaic assembly into low-voltage direct-current bus voltage;
the third full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit is used for realizing the mutual conversion among the low-voltage DC bus voltage, the energy storage module voltage and the voltage required by the DC load 1 with the working voltage being the safety voltage, and providing the required DC voltage for the energy storage module or the DC load 1 with the working voltage being the safety voltage;
the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit converts direct current required by a direct current load 1 with the working voltage being the safety voltage into power conversion of direct current required by a direct current load 2 with the working voltage being the safety voltage, and provides the required direct current voltage for the direct current load 2 with the working voltage being the safety voltage;
the single-phase full-bridge inversion unit is used for converting the low-voltage direct-current bus voltage into power conversion of household single-phase alternating current, and providing the required alternating current voltage for the household single-phase alternating current load.
Further, according to the household ac/DC hybrid bidirectional electric energy interaction energy router, the router further comprises a single-phase full-bridge rectifying unit and a second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit, wherein the input end of the single-phase full-bridge rectifying unit is connected with the wind driven generator, and the output end of the single-phase full-bridge rectifying unit is connected with the input end of the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit; the output end of the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus; and
the single-phase full-bridge rectification unit is used for realizing the power conversion of alternating current output by the wind driven generator into low-voltage direct current;
the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit is used for realizing power conversion from low-voltage direct-current voltage at the output end of the single-phase full-bridge rectification unit to low-voltage direct-current bus voltage.
Further, according to the household ac/DC hybrid bidirectional electric energy interaction energy router, the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit, the first full-bridge SRC resonant soft switch unidirectional DC/DC conversion unit and the single-phase full-bridge inverter unit all have a conducting mode and a non-conducting mode, wherein the conducting mode is a power/active power flowing from an input end to an output end, and the non-conducting mode is a non-power flowing;
The full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit and the single-phase full-bridge bidirectional interconnection conversion unit are provided with a forward conduction mode, a reverse conduction mode and a non-conduction mode, wherein the forward conduction mode is that energy flows from an input end to an output end; the reverse conduction mode is that energy flows from an output end to an input end; the non-conductive mode is no energy flow;
the full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit is provided with a first conduction mode, a second conduction mode, a third conduction mode, a fourth conduction mode, a fifth conduction mode and a non-conduction mode, wherein the first conduction mode is that energy flows from an input end to a first output end and a second output end at the same time, the second conduction mode is that energy flows from the input end to the second output end, the third conduction mode is that energy flows from the input end to the first output end to the second output end, the fourth conduction mode is that energy flows from the first output end to the input end to the second output end, the fifth conduction mode is that energy flows from the input end to the first output end, and the non-conduction mode is that no energy flows.
Further, according to the household ac/DC hybrid bidirectional power interactive energy router, the single-phase full-bridge rectifying unit and the second full-bridge SRC resonant soft-switching unidirectional DC/DC converting unit each have a conducting mode and a non-conducting mode, where the conducting mode is that power/active power flows from an input end to an output end, and the non-conducting mode is that no power flows.
Further, according to the household ac-DC hybrid bi-directional power interactive energy router, the full-bridge LCLL resonant soft-switching three-port bi-directional DC/DC conversion unit includes: the full-bridge LCLL resonance module, the high-frequency transformer T3, the full-bridge rectification module, the full-wave rectification module and the buck-boost circuit module; the high-frequency transformer T3 is provided with a primary inductor, a first secondary inductor and a second secondary inductor;
the input end of the full-bridge LCLL resonance module is connected with the low-voltage direct-current bus, and the output end of the full-bridge LCLL resonance module is connected with the primary inductor of the high-frequency transformer T3; the input end of the full-bridge rectifier module is connected with the first secondary inductor of the high-frequency transformer T3, and the output end of the full-bridge rectifier module is used as the first output end of the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit to be connected with the energy storage module; the input end of the full-wave rectifying module is connected with the second secondary inductor of the high-frequency transformer T3, and the output end of the full-wave rectifying module is used as the second output end of the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit and is connected with the input end of the buck-boost circuit module; and the output end of the buck-boost circuit module is connected with a direct current load 1 with the working voltage being a safe voltage.
Further, according to the household ac/dc hybrid bidirectional electric energy interaction energy router, the full-bridge LCLL resonance module includes a MOS transistor Q21, a MOS transistor Q22, a MOS transistor Q23, a MOS transistor Q24, an additional inductance La, a resonance inductance Lr3, a resonance capacitance Cr3, and an excitation inductance Lm3; the drain electrode of the Q21 is connected with the drain electrode of the Q23 and the positive electrode of the low-voltage direct current bus, the source electrode of the Q21 is connected with the drain electrode of the Q22, one end of the Lr3 and one end of the La, the source electrode of the Q22 is connected with the source electrode of the Q24 and the negative electrode of the low-voltage direct current bus, the other end of the Lr3 is connected with one end of the Cr3, the other end of the Cr3 is connected with one end of the Lm3, the other end of the Lm3 is connected with the other end of the La, the source electrode of the Q23 and the drain electrode of the Q24, and the Lm3 is connected with the primary inductor of the high-frequency transformer T3 in parallel;
the full-wave rectification module comprises a synchronous rectifying tube SR3, a synchronous rectifying tube SR4 and a capacitor C5; the buck-boost circuit module comprises a MOS tube Q29, an inductor L3, a diode D2 and a capacitor C7; the center tap of the second secondary inductor of the high-frequency transformer T3 is connected with the positive electrode of the C5 and the drain electrode of the Q29, one end of the second secondary inductor of the high-frequency transformer T3 is connected with the drain electrode of the SR3, the other end of the second secondary inductor of the high-frequency transformer T3 is connected with the drain electrode of the SR4, the source electrode of the SR3 is connected with the source electrode of the SR4, the negative electrode of the C5, one end of the L3 and the positive electrode of the C7, the source electrode of the Q29 is connected with the other end of the L3 and the negative electrode of the D2, the positive electrode of the D2 is connected with the negative electrode of the C7, and the capacitor C7 is connected with the direct-current load 1 with the working voltage being a safe voltage and the first full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit in parallel;
The full-bridge rectification module comprises a MOS tube Q25, a MOS tube Q26, a MOS tube Q27, a MOS tube Q28 and a capacitor C6; the source electrode of the Q25 is connected with the drain electrode of the Q26 and one end of the first secondary inductor of the high-frequency transformer T3; the source electrode of the Q27 is connected with the drain electrode of the Q28 and the other end of the first secondary inductor of the high-frequency transformer T3; the drain electrode of the Q25 is connected with the drain electrode of the Q27 and the anode of the C6, the source electrode of the Q26 is connected with the source electrode of the Q28 and the cathode of the C6, and the C6 is connected with the energy storage module in parallel; the control signals of Q21, Q22, Q23, Q24, Q25, Q26, Q27 and Q28 are modulated by PFM; the control signal of Q29 adopts PWM modulation.
The invention provides an energy scheduling method based on the household alternating current-direct current hybrid bidirectional electric energy interaction energy router, which can dynamically adjust the working mode of the energy router according to the power generation state of the distributed renewable energy source and the household electricity demand, wherein the working mode of the energy router comprises a normal mode, a power grid fault mode and an active power failure mode; under the normal electricity utilization condition of the household, when the voltage of the household single-phase alternating-current power grid is larger than a fault voltage threshold value and the duration time is larger than an anti-shake time threshold value, the energy router is controlled to work in a normal mode, and when the voltage of the household single-phase alternating-current power grid is smaller than or equal to the fault voltage threshold value and the duration time is larger than or equal to the anti-shake time threshold value, the energy router is controlled to work in a power grid fault mode; under the home active power down condition, the energy router is controlled to work in an active power down mode.
Further, according to the energy scheduling method based on the user ac/dc hybrid bidirectional electric energy interaction energy router, the method is characterized in that: controlling the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit, the first full-bridge SRC resonant soft switch unidirectional DC/DC conversion unit and the single-phase full-bridge inversion unit to be in a conduction mode; if the energy storage module is full, controlling the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit to be in a second conduction mode, otherwise, in a first conduction mode; if the output power of the distributed energy source is larger than the total power required by the household load and the energy storage module, the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switching bidirectional DC/DC conversion unit are controlled to be in a reverse conduction mode, if the output power of the distributed energy source is equal to the total power required by the household load and the energy storage module, the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switching bidirectional DC/DC conversion unit are controlled to be in a non-conduction mode, and if the output power of the distributed energy source is smaller than the total power required by the household load and the energy storage module, the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switching bidirectional DC/DC conversion unit are controlled to be in a forward conduction mode;
The grid fault mode: controlling the running state of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a constant-voltage mode so as to maintain the voltage stability of a direct-current bus; controlling the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit, the first full-bridge SRC resonant soft switch unidirectional DC/DC conversion unit and the single-phase full-bridge inversion unit to be in a conduction mode; controlling the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit to be in a non-conduction mode; if the output power of the distributed energy source is smaller than the power required by the user alternating current load, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a fourth conduction mode, if the output power of the user renewable energy source is larger than or equal to the power required by the user single-phase alternating current load and smaller than the total power required by the user load, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a third conduction mode, if the output power of the user renewable energy source is equal to the total power required by the user load or the output power of the user renewable energy source is larger than the total power required by the user load and the energy storage is full, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a second conduction mode, and if the output power of the user renewable energy source is larger than the total power required by the user load and the energy storage module is not full, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in the first conduction mode;
The active power down mode: the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, the full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit, the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, the first full-bridge SRC resonance soft switch Guan Shanxiang DC/DC conversion unit, the single-phase full-bridge bidirectional interconnection conversion unit and the single-phase full-bridge inversion unit are controlled to be in a non-conductive mode.
Further, according to the energy scheduling method based on the user ac/dc hybrid bidirectional electric energy interaction energy router, in the grid fault mode, if P G (k)-P Y (k)+F C (k)P C (k) < 0, then the current customer load is cut off and the following expression is satisfied:
if P G (k)-P Y (k)+F C (k)P C (k) And (3) if the energy output is more than 0, controlling the distributed energy output to meet the following expression:
P G (k)-P Y (k)+F C (k)P C (k)＝0
if P G (k)-P Y (k)+F C (k)P C (k) > 0 and P C (k) =0, then normal power supply of all load interfaces is restored;
in the above, U 220V (k)、I 220V (k)、U 12V (k)、I 12V (k)、U 36V (k)、I 36V (k) In turn, on the single-phase alternating current load sideThe method comprises the steps of voltage sampling value, current sampling value at the side of a household single-phase alternating-current load, voltage sampling value at the side of a direct-current load 1 with working voltage being safe voltage, current sampling value at the side of a direct-current load 1 with working voltage being safe voltage, voltage sampling value at the side of a direct-current load 2 with working voltage being safe voltage and current sampling value at the side of a direct-current load 2 with working voltage being safe voltage; p (P) G (k)、P Y (k)、P C (k) The photovoltaic side input power, the user side output power and the energy storage side input power are sequentially provided; f (F) C (k) Is a mode switching function:
wherein Δp is a constant difference of the energy router, and the expression Δp (k) =p G (k)-P Y (k)；
The power grid fault mode adopts an operation state of an energy storage module to maintain the stability of the low-voltage direct-current bus voltage of the energy router, when the residual capacity SOC of a battery is larger than 0.6 when the energy storage module is charged, the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit adopts a constant-voltage mode, and when the SOC is lower than 0.6, the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit adopts a constant-current mode; meanwhile, the safety working range of the energy storage module is set to be 0.95> SOC >0.05 so as to ensure the service life of the energy storage module;
the constant voltage mode when the energy storage module charges is:
U Cref (k)＝U C * -mΔP(k-1)
in the above formula, m is a given constant voltage charging coefficient;U U 、U Cref 、U、K P 、K i respectively rated charging voltage value of the energy storage module and full-bridge LCLL resonance soft switchThe method comprises the steps of referring to a reference voltage value of a first output end of a three-port bidirectional DC/DC conversion unit, inputting voltage deviation of an input end of a full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, an actual voltage value of an energy storage module, a given voltage proportional coefficient and a given voltage integral coefficient;
The constant current mode when the energy storage module is charged is as follows:
I Cref (k)＝I C * -nΔP(k-1)
in the above formula, n is a given constant current charging coefficient;U I 、I Cref 、I、K P 、K i the method comprises the steps of respectively obtaining a rated current value of an energy storage module, a reference current value of a first output end of a full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, an input current difference of an input end of the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, an actual current value of the energy storage module, a given current proportional coefficient and a given current integral coefficient;
constant voltage mode when energy storage module discharges:
U ZCref (k)＝U ZC * -bΔP(k-1)
in the above formula, b is a given coefficient;U ZU 、U ZCref 、U Z 、K P 、K i the reference voltage value of the first output end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit, the input voltage deviation of the input end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit and the low voltage are respectively the rated value of the low-voltage direct current busThe actual voltage value of the direct current bus, a given voltage proportional coefficient and a given voltage integral coefficient;
when the energy storage module is in a cut-off working state, if the SOC is more than 0.95, the side voltage of the household single-phase alternating-current power grid is reduced, and if the SOC is less than 0.05, the side voltage of the household single-phase alternating-current power grid is increased to stabilize the voltage fluctuation of the low-voltage direct-current bus, as follows:
wherein U is Dref 、U Z 、U Zref The method comprises the steps of outputting a voltage reference value at the side of a household single-phase alternating-current power grid, and outputting a voltage actual value at the side of a low-voltage direct-current bus and a voltage reference value at the side of the low-voltage direct-current bus.
Further, according to the energy scheduling method based on the user alternating current-direct current hybrid bidirectional electric energy interaction energy router, the energy scheduling method realizes intelligent coordination distribution of household electricity based on the energy routing algorithm with the minimum cost in the normal mode and the power grid fault mode, and the energy flow path distributed based on the energy routing algorithm with the minimum cost meets the following conditions:
P Y (k)＝P Y_12DC (k)+P Y_36DC (k)+P Y_220AC (k)
P G (k)＝P G_12DC (k)+P G_36DC (k)+P G_220AC (k)+P G_C (k)
P C (k)＝P C_12DC (k)+P C_36DC (k)+P C_220AC (k)-P G_C (k)-P F_C (k)
P D (k)＝P D_12DC (k)+P D_36DC (k)+P D_220AC (k)+P D_C (k)
wherein min { P D (k)+P C (k) The energy distribution path corresponding to the energy distribution path is the energy routing path with the minimum cost; p (P) G (k)、P Y (k)、P D (k)、P C (k) The power input device comprises photovoltaic side input power, user side output power, power grid side input power and energy storage side input power in sequenceA rate; p (P) Y_12DC (k)、P Y_36DC (k)、P Y_220AC (k) The total power supply power required by the direct current load 2, the total power supply power required by the direct current load 1 and the total power supply power required by the household single-phase alternating current load are sequentially set; p (P) G_12DC (k)、P C_12DC (k)、P D_12DC (k) The photovoltaic power supply power, the energy storage power supply power and the power grid power supply power which are required by the direct current load 2 are respectively provided; p (P) G_36DC (k)、P C_36DC (k)、P D_36DC (k) The photovoltaic power supply power, the energy storage power supply power and the power grid power supply power which are required by the direct current load 1 are respectively provided; p (P) G_220AC (k)、P C_220AC (k)、P D_220AC (k) The photovoltaic power supply power, the energy storage power supply power and the power grid power supply power required by the household single-phase alternating current load are respectively provided; p (P) G_C (k)、P F_C (k)、P D_C (k) The photovoltaic power supply power required by the energy storage module, the wind power supply power required by the energy storage module and the household single-phase alternating current power grid power supply power required by the energy storage module are sequentially respectively provided; and
P Y_12DC (k)＝P G_12DC (k)η 2 η 3 η 4 +P C_12DC (k)η 3 η 4 +P D_12DC (k)η 1 η 3 η 4 η 7 ；
P Y_36DC (k)＝P G_36DC (k)η 2 η 3 +P C_36DC (k)η 3 +P D_36DC (k)η 1 η 3 η 7 ；
P Y_220AC (k)＝P G_220AC (k)η 1 η 2 η 8 +P C_220AC (k)η 3 η 8 +P D_220AC (k)η 1 η 7 η 8 ；
wherein eta 1 、η 2 、η 3 、η 4 、η 7 、η 8 The full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, the full-bridge LLC resonance soft switch Guan Shanxiang DC/DC conversion unit, the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit and the single-phase full-bridge double-port bidirectional DC/DC conversion unit are respectively adoptedAnd transmitting efficiency to the interconnection conversion unit and the single-phase full-bridge inversion unit.
The beneficial effects of the invention are as follows:
1. the household AC/DC hybrid bidirectional electric energy interaction energy router realizes AC/DC hybrid, power conversion with multiple voltage levels and bidirectional electric energy interaction through an advanced power electronic technology, can realize the on-site consumption of household renewable energy sources, can provide plug-and-play AC/DC hybrid ports with multiple voltage levels for household users, provides basic conditions for the development of various household appliances to DC and miniaturization, and realizes the safety of DC power consumption, wherein the voltage provided by the DC ports is less than or equal to 36V; the energy router has the advantages of high power density, high efficiency, low EMI and the like, has excellent soft switching performance under the full working condition, and also has various functions of overvoltage protection, overcurrent protection, electricity utilization power quality improvement and the like; the energy router provides reactive power for an alternating current load in a household through the capacitor of the direct current bus, so that reactive pressure brought by household electricity to a power distribution network is eliminated; the energy router has the capability of accessing various distributed energy sources and household single-phase power grids, and the stability problem caused by accessing a large amount of high-permeability distributed energy sources into the power grids is relieved; the topology structure of the energy router is highly modularized, so that function expansion and redundancy design are facilitated, electric isolation is arranged among ports, and when a port fault exists, the fault port can be bypassed to ensure that other ports work normally.
2. According to the energy dispatching method based on the energy router, the working mode of the energy router can be adaptively regulated according to the state of a single-phase power grid and the household demand, so that household intelligent electricity management is realized; under the normal mode, intelligent optimal dispatching of household electricity consumption can be realized, electricity consumption cost is reduced to the maximum extent on the premise of meeting a household electricity consumption plan, reactive power can be optimally output to the household power distribution network as required according to reactive dispatching instructions of the household single-phase power distribution network and instantaneous residual capacity of the single-phase full-bridge bidirectional interconnection conversion unit, and reactive compensation is provided; under the power grid fault mode, the island operation of the energy router can be realized, and when the power supply is needed to be larger than the power supply, the excess load can be cut off according to the power supply priority, so that the normal use of the user load is ensured to the greatest extent; under the normal mode and the power grid fault mode, intelligent coordination distribution of household electricity is realized through an energy routing algorithm based on minimum cost, and the energy utilization efficiency is improved; in the active power-off mode, all power supply ports of the energy router can be turned off, and the actual requirements of users are met.
Drawings
Fig. 1 is a schematic structural diagram of a household ac/dc hybrid bidirectional power interactive energy router according to the present embodiment;
FIG. 2 is a schematic circuit diagram of a hybrid AC/DC bi-directional power interactive energy router for a household in this embodiment;
fig. 3 is a schematic circuit diagram of a single-phase full-bridge bidirectional interconnection conversion unit according to the present embodiment;
fig. 4 is a schematic circuit diagram of a full-bridge SRC resonant soft-switching bidirectional DC/DC conversion unit according to this embodiment;
fig. 5 is a schematic circuit diagram of the full-bridge LLC resonant soft-switching unidirectional DC/DC conversion unit of this embodiment;
fig. 6 is a schematic circuit diagram of a full-bridge LCLL resonant soft-switching three-port bi-directional DC/DC conversion unit of the present embodiment;
fig. 7 is a schematic circuit diagram of a first full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit according to this embodiment;
fig. 8 is a schematic circuit diagram of the single-phase full-bridge inverter unit of the present embodiment;
fig. 9 is a schematic circuit diagram of a single-phase full-bridge rectifier unit according to the present embodiment;
fig. 10 is a schematic circuit diagram of a second full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit according to this embodiment;
fig. 11 is a schematic flow chart of an energy scheduling method based on a user ac/dc hybrid bidirectional power interactive energy router according to the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The specific embodiments described herein are to be considered in an illustrative sense only and are not intended to limit the invention.
Fig. 1 is a schematic structural diagram of a household ac-DC hybrid bidirectional electric energy interaction energy router according to this embodiment, as shown in fig. 1, where the household ac-DC hybrid bidirectional electric energy interaction energy router includes a single-phase full-bridge bidirectional interconnection conversion unit, a full-bridge SRC resonant soft-switching bidirectional DC/DC conversion unit, a full-bridge LLC resonant soft-switching unidirectional DC/DC conversion unit, a full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit, a first full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit, a single-phase full-bridge inversion unit, and a low-voltage DC bus.
The low-voltage dc bus voltage is a low-voltage dc, and in this embodiment, the low-voltage dc bus voltage is 400V.
Fig. 2 is a schematic circuit diagram of a household ac/dc hybrid bidirectional electric energy interaction energy router according to the present embodiment, as shown in fig. 2, an input end of the single-phase full-bridge bidirectional interconnection conversion unit is connected to a household single-phase ac power grid, and in the present embodiment, the input end is connected to a household 220V single-phase ac power grid; the output end of the single-phase full-bridge bidirectional interconnection conversion unit is connected with the input end of the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit; the output end of the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus; the input end of the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit is connected with a photovoltaic module with a maximum power point tracking (Maximum Power Point Tracking, MPPT) controller, and the output end of the full-bridge LLC resonant soft switch Guan Shanxiang DC/DC conversion unit is connected with a low-voltage DC bus; the input end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus, the first output end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit is connected with the energy storage module, and the energy storage capacity of the energy storage module in the embodiment is 40V; the second output end of the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit is connected with a direct-current load 1 with the working voltage being a safe voltage and the input end of the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit; the output end of the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit is connected with a direct-current load 2 with working voltage being safe voltage; in this embodiment, the operating voltage of the dc load 1 is 36V of the safety voltage, and the operating voltage of the dc load 2 is 12V of the safety voltage; the input end of the single-phase full-bridge inverter unit is connected with the low-voltage direct-current bus, and the output end of the single-phase full-bridge inverter unit is connected with the alternating-current load of the household single-phase alternating-current voltage, in the embodiment, the alternating-current load is 220V voltage class alternating-current load.
As shown in fig. 1, the router may further include an expandable unit formed by a single-phase full-bridge rectifying unit and a second full-bridge SRC resonance soft-switching unidirectional DC/DC conversion unit, where when a household user has a use requirement of the wind driven generator, the expandable unit may be used to realize access of wind power generation.
As shown in fig. 2, the input end of the single-phase full-bridge rectifying unit is connected with the wind driven generator, and the output end of the single-phase full-bridge rectifying unit is connected with the input end of the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit; and the output end of the second full-bridge SRC resonance soft switch Guan Shanxiang DC/DC conversion unit is connected with the low-voltage direct-current bus.
As shown in fig. 6, the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit includes a full-bridge LCLL resonant module, a high-frequency transformer T3, a full-bridge rectifying module, a full-wave rectifying module, and a buck-boost circuit module; wherein the high frequency transformer T3 has a primary inductance, a first secondary inductance and a second secondary inductance, and the second secondary inductance has a center tap; the input end of the full-bridge LCLL resonance module is connected with the low-voltage direct-current bus, and the output end of the full-bridge LCLL resonance module is connected with the primary inductor of the high-frequency transformer T3; the input end of the full-bridge rectifying module is connected with a first secondary inductor of the high-frequency transformer T3, and the output end of the full-bridge rectifying module, namely the first output end of the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit, is connected with the energy storage module; the input end of the full-wave rectifying module is connected with the second secondary inductor of the high-frequency transformer T3, and the output end of the full-wave rectifying module, namely the second output end of the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit, is connected with the input end of the buck-boost circuit module; the output end of the buck-boost circuit module is connected with a direct current load 1 with working voltage being safe voltage.
The single-phase full-bridge bidirectional interconnection conversion unit is used for realizing mutual power conversion between a household single-phase alternating current power grid (220V single-phase alternating current in the embodiment) and low-voltage direct current, and realizing that the single-phase full-bridge bidirectional interconnection conversion unit works in a rectification working mode or an inversion working mode according to different control modes; the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit is used for realizing the mutual power conversion between the low-voltage direct current and the low-voltage direct current bus at the output end of the single-phase full-bridge bidirectional interconnection conversion unit; the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switch bidirectional DC/DC conversion unit cooperatively realize bidirectional electric energy interaction between a household single-phase alternating-current power grid and a low-voltage direct-current bus, namely when the single-phase full-bridge bidirectional interconnection conversion unit works in a rectification working mode, the full-bridge SRC resonance soft-switch bidirectional DC/DC conversion unit transmits power to the low-voltage direct-current bus, and when the single-phase full-bridge bidirectional interconnection conversion unit works in an inversion working mode, the full-bridge SRC resonance soft-switch bidirectional DC/DC conversion unit transmits power to the single-phase full-bridge bidirectional interconnection conversion unit.
The full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit is used for realizing power conversion from direct-current voltage output by the photovoltaic assembly to low-voltage direct-current bus voltage;
The full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit is used for realizing the mutual conversion among the low-voltage direct-current bus voltage, the direct-current voltage of the energy storage module and the voltage required by the direct-current load 1 with the working voltage being the safety voltage, and realizing that the full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit works in a boosting working mode or a reducing working mode according to different control modes, so as to realize that the energy storage module or the direct-current load 1 with the working voltage being the safety voltage provides the required direct-current voltage;
the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit is used for realizing the power conversion of converting the direct current required by the direct current load 1 with the working voltage being the safety voltage into the direct current required by the direct current load 2 with the working voltage being the safety voltage, and supplying the required direct current voltage to the direct current load 2 with the working voltage being the safety voltage;
the single-phase full-bridge inversion unit is used for converting the low-voltage direct-current bus voltage into power conversion of household single-phase alternating current (220V and 50Hz in the embodiment) so as to provide the required alternating voltage for the household single-phase alternating current load;
the single-phase full-bridge rectification unit is used for realizing the power conversion of alternating current output by the wind driven generator into low-voltage direct current;
The second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit is used for realizing power conversion from low-voltage direct current at the output end of the single-phase full-bridge rectification unit to low-voltage direct current bus voltage;
the low-voltage direct-current bus is used for stabilizing the output voltage of the full-bridge SRC resonant soft switch bidirectional DC/DC conversion unit, the output voltage of the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit, the input voltage of the single-phase full-bridge inversion unit, the output voltage of the second full-bridge SRC resonant soft switch unidirectional DC/DC conversion unit and the input voltage of the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit; and completing electric energy flow between the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, the full-bridge LLC resonance soft switch Guan Shanxiang DC/DC conversion unit, the single-phase full-bridge inversion unit, the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit and the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit.
The full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit, the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit, the single-phase full-bridge inversion unit, the single-phase full-bridge rectification unit and the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit all have a conduction mode and a non-conduction mode, wherein the conduction mode is that power/active power flows from an input end to an output end, and the non-conduction mode is that no power flows; the method specifically comprises the following steps: 1) The full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit and the single-phase full-bridge bidirectional interconnection conversion unit are provided with three power flow working modes, namely a forward conduction mode, a reverse conduction mode and a non-conduction mode, wherein the forward conduction mode is that power/active power flows from an input end to an output end, the reverse conduction mode is that power/active power flows from the output end to the input end, and the non-conduction mode is that no power/active power flows; 2) The full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit is provided with six power flow working modes, namely a first conduction mode, a second conduction mode, a third conduction mode, a fourth conduction mode, a fifth conduction mode and a non-conduction mode, wherein the first conduction mode is that power flows from an input end to a first output end and a second output end at the same time, the second conduction mode is that power flows from the input end to the second output end, the third conduction mode is that power flows from the input end and the first output end to the second output end, the fourth conduction mode is that power flows from the first output end to the input end and the second output end at the same time, the fifth conduction mode is that power flows from the input end to the first output end, and the non-conduction mode is that no power flows;
The full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, the full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit, the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit, the single-phase full-bridge inversion unit, the single-phase full-bridge rectification unit and the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit all have overvoltage protection and overcurrent protection functions;
fig. 3 is a schematic circuit diagram of the single-phase full-bridge bidirectional interconnection conversion unit, as shown in fig. 3, where the single-phase full-bridge bidirectional interconnection conversion unit includes a Metal-Oxide-semiconductor field effect transistor (MOSFET) Q1, a Metal-Oxide-semiconductor field effect transistor Q2, a Metal-Oxide-semiconductor field effect transistor Q3, a Metal-Oxide-semiconductor field effect transistor Q4, a grid-connected inductor L1, and a capacitor C1; the source electrode of the metal oxide semiconductor field effect transistor Q1 is connected with one end of the grid-connected inductor L1 and the drain electrode of the metal oxide semiconductor field effect transistor Q2, the drain electrode of the metal oxide semiconductor field effect transistor Q1 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q3 and the positive electrode of the capacitor C1, the source electrode of the metal oxide semiconductor field effect transistor Q2 is connected with the source electrode of the metal oxide semiconductor field effect transistor Q4 and the negative electrode of the capacitor C1, the other end of the grid-connected inductor L1 is connected with a household single-phase alternating-current power grid, the source electrode of the metal oxide semiconductor field effect transistor Q3 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q4 and the other end of the household single-phase alternating-current power grid, and the capacitor C1 is connected with the full-bridge SRC resonant soft-switching bidirectional DC/DC conversion unit in parallel; the control signal of the single-phase full-bridge bidirectional interconnection conversion unit adopts SPWM modulation;
Fig. 4 is a schematic circuit diagram of the full-bridge SRC resonant soft-switching bidirectional DC/DC conversion unit, as shown in fig. 4, where the full-bridge SRC resonant soft-switching bidirectional DC/DC conversion unit includes a metal oxide semiconductor field-effect transistor Q5, a metal oxide semiconductor field-effect transistor Q6, a metal oxide semiconductor field-effect transistor Q7, a metal oxide semiconductor field-effect transistor Q8, a metal oxide semiconductor field-effect transistor Q9, a metal oxide semiconductor field-effect transistor Q10, a metal oxide semiconductor field-effect transistor Q11, a metal oxide semiconductor field-effect transistor Q12, a resonant inductor Lr1, a resonant capacitor Cr1, a high-frequency transformer T1 and a capacitor C2; the drain electrode of the metal oxide semiconductor field effect transistor Q5 and the source electrode of the metal oxide semiconductor field effect transistor Q6 are respectively connected with the positive electrode and the negative electrode of the output end of the single-phase full-bridge bidirectional interconnection conversion unit, the drain electrode of the metal oxide semiconductor field effect transistor Q5 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q7, the source electrode of the metal oxide semiconductor field effect transistor Q6 is connected with the source electrode of the metal oxide semiconductor field effect transistor Q8, the source electrode of the metal oxide semiconductor field effect transistor Q5 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q6 and one end of a resonant inductor Lr1, the other end of the resonant inductor Lr1 is connected with one end of a resonant capacitor Cr1, the other end of the resonant capacitor Cr1 is connected with one end of a primary inductor of a high-frequency transformer T1, the source electrode of the metal oxide semiconductor field effect transistor Q7 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q8 and the other end of the primary inductor of the high-frequency transformer T1, the source electrode of the metal oxide semiconductor field effect transistor Q9 is connected with the source electrode of the metal oxide semiconductor field effect transistor Q8, the source electrode of the metal oxide semiconductor field effect transistor Q10 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q10 and the other end of the primary inductor of the high-frequency transformer T1, the metal oxide semiconductor field effect transistor Q2 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q2 is connected with the other end of the drain electrode of the high-frequency transformer Q2, the other end of the metal oxide semiconductor field effect transistor Q2 is connected with the primary inductor of the high-level inductor Q2 is connected with the metal electrode of the high-level electrode of the high-frequency transformer T2; the control signal of the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit adopts PFM modulation;
Fig. 5 is a schematic circuit diagram of the full-bridge LLC resonant soft-switching unidirectional DC/DC conversion unit, which includes, as shown in fig. 5, a metal oxide semiconductor field effect transistor Q13, a metal oxide semiconductor field effect transistor Q14, a metal oxide semiconductor field effect transistor Q15, a metal oxide semiconductor field effect transistor Q16, a capacitor C3, a capacitor C4, a diode D1, a resonant capacitor Cr2, a resonant inductor Lr2, an excitation inductor Lm2, a synchronous rectifier SR1, a synchronous rectifier SR2, and a high-frequency transformer T2 with a center tap; the anode of the diode D1 is connected with the anode of the output end of the photovoltaic component, the cathode of the diode D1 is connected with the anode of the capacitor C3, the drain of the metal oxide semiconductor field effect transistor Q13 and the drain of the metal oxide semiconductor field effect transistor Q15, the cathode of the output end of the photovoltaic component is connected with the cathode of the capacitor C3, the source of the metal oxide semiconductor field effect transistor Q14 and the source of the metal oxide semiconductor field effect transistor Q16, the source of the metal oxide semiconductor field effect transistor Q15 is connected with the drain of the metal oxide semiconductor field effect transistor Q16 and one end of the resonant capacitor Cr2, the other end of the resonant capacitor Cr2 is connected with one end of the resonant inductor Lr2, the other end of the resonant inductor Lr2 is connected with one end of the exciting inductor Lm2, the other end of the exciting inductor Lm2 is connected with the source of the metal oxide semiconductor field effect transistor Q14, the source of the exciting inductor Lm2 is connected with the primary inductor of the high frequency transformer T2 in parallel, the center tap of the high frequency transformer T2 is connected with the drain of the capacitor C4, the positive frequency transformer T2 is connected with the drain of the exciting current tube, and the other end of the exciting current tube T2 is connected with the cathode of the high frequency rectifier tube is connected with the cathode of the exciting current tube, the cathode of the exciting current tube is connected with the cathode of the capacitor C2 is connected with the cathode of the exciting current tube 1, the exciting current tube is connected with the cathode of the exciting tube 1; the control signal of the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit adopts PFM modulation;
Fig. 6 is a schematic circuit diagram of the full-bridge LCLL resonant soft-switching triac bidirectional DC/DC conversion unit, as shown in fig. 6, which includes a metal oxide semiconductor field effect transistor Q21, a metal oxide semiconductor field effect transistor Q22, a metal oxide semiconductor field effect transistor Q23, a metal oxide semiconductor field effect transistor Q24, a metal oxide semiconductor field effect transistor Q25, a metal oxide semiconductor field effect transistor Q26, a metal oxide semiconductor field effect transistor Q27, a metal oxide semiconductor field effect transistor Q28, a metal oxide semiconductor field effect transistor Q29, a synchronous rectifier SR3, a synchronous rectifier SR4, a resonant inductor Lr3, a resonant capacitor Cr3, an inductor Lm3, an additional inductor La, a capacitor C5, a capacitor C6, a capacitor C7, a diode D2, an inductor L3, and a high-frequency transformer T3; the high frequency transformer T3 has a primary inductance, a first secondary inductance and a second secondary inductance with a center tap. As shown in fig. 6, the full-bridge LCLL resonant module includes a MOS transistor Q21, a MOS transistor Q22, a MOS transistor Q23, a MOS transistor Q24, an additional inductor La, a resonant inductor Lr3, a resonant capacitor Cr3, and an excitation inductor Lm3, where a drain of the metal oxide semiconductor field effect transistor Q21 is connected to a drain of the metal oxide semiconductor field effect transistor Q23 and an anode of the low-voltage dc bus, a source of the metal oxide semiconductor field effect transistor Q22 is connected to a source of the metal oxide semiconductor field effect transistor Q24 and a cathode of the low-voltage dc bus, a source of the metal oxide semiconductor field effect transistor Q21 is connected to a drain of the metal oxide semiconductor field effect transistor Q22, one end of the resonant inductor Lr3 and one end of the additional inductor La, another end of the resonant inductor Lr3 is connected to one end of the resonant capacitor Cr3, another end of the resonant capacitor Cr3 is connected to one end of the excitation inductor Lm3, another end of the excitation inductor Lm3 is connected to another end of the additional inductor La, a source of the metal oxide semiconductor field effect transistor Q23 and the metal oxide semiconductor field effect transistor Lm 24 are connected to a drain of the high-frequency transformer inductance Lm 3; the full-wave rectification module comprises a synchronous rectifying tube SR3, a synchronous rectifying tube SR4 and a capacitor C5; the buck-boost circuit module comprises a MOS tube Q29, an inductor L3, a diode D2 and a capacitor C7; the center tap of the second secondary inductor of the high-frequency transformer T3 is connected with the positive electrode of the capacitor C5 and the drain electrode of the metal oxide semiconductor field effect transistor Q29, one end of the second secondary inductor is connected with the drain electrode of the synchronous rectifying tube SR3, the other end of the second secondary inductor is connected with the drain electrode of the synchronous rectifying tube SR4, the source electrode of the synchronous rectifying tube SR3 is connected with the source electrode of the synchronous rectifying tube SR4, the negative electrode of the capacitor C5, one end of the inductor L3 and the positive electrode of the capacitor C7, the source electrode of the metal oxide semiconductor field effect transistor Q29 is connected with the other end of the inductor L3 and the negative electrode of the diode D2, the anode of the diode D2 is connected with the negative electrode of the capacitor C7, and the capacitor C7 is connected with the direct current load 1 with the working voltage being the safe voltage and the first full bridge SRC resonant soft switch unidirectional DC/DC conversion unit in parallel; as shown in fig. 6, the full-bridge rectifier module includes a MOS transistor Q25, a MOS transistor Q26, a MOS transistor Q27, a MOS transistor Q28, and a capacitor C6, where a source of the MOS transistor Q25 is connected to a drain of the MOS transistor Q26 and one end of the first secondary inductor of the high-frequency transformer T3, a source of the MOS transistor Q27 is connected to a drain of the MOS transistor Q28 and the other end of the first secondary inductor of the high-frequency transformer T3, a drain of the MOS transistor Q25 is connected to a drain of the MOS transistor Q27 and an anode of the capacitor C6, a source of the MOS transistor Q26 is connected to a source of the MOS transistor Q28 and a cathode of the capacitor C6, and the capacitor C6 is connected in parallel to the energy storage module; the control signals of the metal oxide semiconductor field effect transistor Q21, the metal oxide semiconductor field effect transistor Q22, the metal oxide semiconductor field effect transistor Q23, the metal oxide semiconductor field effect transistor Q24, the metal oxide semiconductor field effect transistor Q25, the metal oxide semiconductor field effect transistor Q26, the metal oxide semiconductor field effect transistor Q27 and the metal oxide semiconductor field effect transistor Q28 in the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit are modulated by PFM, and the control signal of the metal oxide semiconductor field effect transistor Q29 is modulated by PWM;
Fig. 7 is a schematic circuit diagram of the first full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit, as shown in fig. 7, where the first full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit includes a metal oxide semiconductor field effect transistor Q30, a metal oxide semiconductor field effect transistor Q31, a metal oxide semiconductor field effect transistor Q32, a metal oxide semiconductor field effect transistor Q33, a resonant capacitor Cr4, a resonant inductor Lr4, a high-frequency transformer T4 with a center tap, a synchronous rectifier SR5, a synchronous rectifier SR6, and a capacitor C8; the drain electrode of the metal oxide semiconductor field effect transistor Q30 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q32 and the positive electrode of the second output end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit, the source electrode of the metal oxide semiconductor field effect transistor Q31 is connected with the source electrode of the metal oxide semiconductor field effect transistor Q33 and the negative electrode of the second output end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit, the source electrode of the metal oxide semiconductor field effect transistor Q32 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q33 and one end of a resonant capacitor Cr4, the other end of the resonant capacitor Cr4 is connected with one end of a resonant inductor Lr4, the other end of the resonant inductor Lr4 is connected with one end of a primary inductor of a high-frequency transformer T4, the other end of the primary inductor of the high-frequency transformer T4 is connected with the source electrode of the metal oxide semiconductor field effect transistor Q33, the center tap of the secondary inductor of the high-frequency transformer T4 is connected with the positive electrode of a capacitor C8, the secondary inductor of the high-frequency transformer T4 is connected with the positive electrode of the capacitor C8, the secondary inductor of the high-frequency transformer T4 is connected with the secondary inductor of the high-frequency transformer is connected with the negative electrode of the capacitor C6 of the capacitor, the secondary capacitor is connected with the positive electrode of the capacitor 6 of the high-frequency capacitor is connected with the secondary capacitor 6, and the secondary capacitor is connected with the positive electrode of the secondary capacitor 6 of the secondary capacitor is connected with the secondary capacitor of the secondary capacitor; the control signal of the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit adopts PFM modulation;
Fig. 8 is a schematic circuit diagram of the single-phase full-bridge inverter unit, as shown in fig. 8, including a metal oxide semiconductor field effect transistor Q17, a metal oxide semiconductor field effect transistor Q18, a metal oxide semiconductor field effect transistor Q19, a metal oxide semiconductor field effect transistor Q20, and an inductance L2; the drain electrode of the metal oxide semiconductor field effect transistor Q17 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q19 and the positive electrode of the low-voltage direct current bus, the source electrode of the metal oxide semiconductor field effect transistor Q18 is connected with the source electrode of the metal oxide semiconductor field effect transistor Q20 and the negative electrode of the low-voltage direct current bus, the source electrode of the metal oxide semiconductor field effect transistor Q17 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q18 and one end of an inductor L2, the other end of the inductor L2 is connected with a household single-phase alternating current load, and the source electrode of the metal oxide semiconductor field effect transistor Q19 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q20 and the other end of the household single-phase alternating current load; the control signal of the single-phase full-bridge inversion unit adopts SPWM modulation;
fig. 9 is a schematic circuit diagram of the single-phase full-bridge rectifier unit, as shown in fig. 9, including a metal oxide semiconductor field effect transistor Q34, a metal oxide semiconductor field effect transistor Q35, a metal oxide semiconductor field effect transistor Q36, a metal oxide semiconductor field effect transistor Q37, an inductor L4, and a capacitor C9; the drain electrode of the metal oxide semiconductor field effect transistor Q34 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q36 and the anode of the capacitor C9, the source electrode of the metal oxide semiconductor field effect transistor Q35 is connected with the source electrode of the metal oxide semiconductor field effect transistor Q37 and the cathode of the capacitor C9, the source electrode of the metal oxide semiconductor field effect transistor Q34 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q35 and one end of the inductor L4, the other end of the inductor L4 is connected with the wind driven generator, the source electrode of the metal oxide semiconductor field effect transistor Q36 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q37 and the other end of the wind driven generator, and the capacitor C9 is connected with the second full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit in parallel; the control signal of the single-phase full-bridge rectifying unit adopts SPWM modulation;
Fig. 10 is a schematic circuit diagram of the second full-bridge SRC resonant soft-switched unidirectional DC/DC conversion unit, as shown in fig. 10, where the second full-bridge SRC resonant soft-switched unidirectional DC/DC conversion unit includes a metal oxide semiconductor field effect transistor Q38, a metal oxide semiconductor field effect transistor Q39, a metal oxide semiconductor field effect transistor Q40, a metal oxide semiconductor field effect transistor Q41, a capacitor C10, a resonant capacitor Cr5, a resonant inductor Lr5, a synchronous rectifier SR7, a synchronous rectifier SR8, and a high-frequency transformer T5 with a center tap; the drain electrode of the metal oxide semiconductor field effect transistor Q38 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q40 and the positive electrode of the output end of the single-phase full-bridge unidirectional rectification unit, the source electrode of the metal oxide semiconductor field effect transistor Q39 is connected with the source electrode of the metal oxide semiconductor field effect transistor Q41 and the negative electrode of the output end of the single-phase full-bridge unidirectional rectification unit, the source electrode of the metal oxide semiconductor field effect transistor Q40 is connected with the drain electrode of the metal oxide semiconductor field effect transistor Q41 and one end of a resonance capacitor Cr5, the other end of the resonance capacitor Cr5 is connected with one end of a resonance inductor Lr5, the other end of the resonance inductor Lr5 is connected with one end of a primary inductor of a high-frequency transformer T5, the other end of the primary inductor of the high-frequency transformer T5 is connected with the source electrode of the metal oxide semiconductor field effect transistor Q39, the center tap of a secondary inductor of the high-frequency transformer T5 is connected with the positive electrode of a capacitor C10, one end of the secondary inductor of the high-frequency transformer T5 is connected with the drain electrode of a synchronous rectifying tube SR7, the other end of the synchronous rectifying capacitor SR7 is connected with the drain electrode of the synchronous rectifier 10 of the high-frequency transformer C8, and the other end of the synchronous rectifier 10 is connected with the drain electrode of the synchronous rectifier 10 of the high-frequency transformer C8; the control signal of the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit adopts PFM modulation;
Fig. 11 is a schematic flow diagram of an energy scheduling method based on the above-mentioned hybrid bidirectional ac/DC electric energy interaction energy router including the expandable unit, in fig. 11, for drawing convenience, a single-phase full-bridge bidirectional interconnection conversion unit, a full-bridge SRC resonant soft-switch bidirectional DC/DC conversion unit, a full-bridge LLC resonant soft-switch unidirectional DC/DC conversion unit, a full-bridge LCLL resonant soft-switch three-port bidirectional DC/DC conversion unit, a first full-bridge SRC resonant soft-switch unidirectional DC/DC conversion unit, a single-phase full-bridge inverter unit, a single-phase full-bridge rectifier unit, and a second full-bridge SRC resonant soft-switch unidirectional DC/DC conversion unit are simply referred to as modules 1, 2, 3, 4, 5, 6, 7, 8, and as shown in fig. 11, the energy scheduling method can dynamically adjust the operation modes of the energy router according to the power generation status of distributed renewable energy sources and the household power consumption requirements, and the operation modes of the energy router include a normal mode, a power grid failure mode, and an active power failure mode; under the normal electricity utilization condition of a household, when the voltage of the household single-phase alternating-current power grid is larger than a fault voltage threshold value and the duration time is larger than an anti-shake time threshold value, the energy router works in a normal mode, and when the voltage of the household single-phase alternating-current power grid is smaller than or equal to the fault voltage threshold value and the duration time is larger than or equal to the anti-shake time threshold value, the energy router is controlled to work in a power grid fault mode; under the home active power down condition, the energy router is controlled to work in an active power down mode. The energy scheduling method can realize intelligent coordination and distribution of household electricity based on the energy routing algorithm with the minimum cost in the normal mode and the power grid fault mode, and can reduce electricity cost while meeting a household electricity plan.
The normal mode controls the full-bridge LLC resonant soft-switching unidirectional DC/DC conversion unit, the first full-bridge SRC resonant soft-switching Guan Shanxiang DC/DC conversion unit, and the single-phase full-bridge inverter unit to be in a conducting mode, and as will be readily understood by those skilled in the art, when the energy router further includes the expandable unit, that is, the single-phase full-bridge rectifying unit and the second full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit, the normal mode also needs to control the single-phase full-bridge rectifying unit and the second full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit to be in a conducting mode; if the energy storage module is full, controlling the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit to be in a second conduction mode, otherwise, controlling the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit to be in a first conduction mode; if the output power of the distributed energy source is larger than the total power required by the household load and the energy storage module, the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switching bidirectional DC/DC conversion unit are controlled to be in a reverse conduction mode, if the output power of the distributed energy source is equal to the total power required by the household load and the energy storage module, the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switching bidirectional DC/DC conversion unit are controlled to be in a non-conduction mode, and if the output power of the distributed energy source is smaller than the total power required by the household load and the energy storage module, the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switching bidirectional DC/DC conversion unit are controlled to be in a forward conduction mode; the operation state of the energy router needs to satisfy the following formula:
P G (k)-P Y (k)+F D (k)P D (k)+F C (k)P C (k)＝0
And when wind power generation is connected, the running state of the energy router needs to meet the following formula:
P G (k)+P F (k)-P Y (k)+F D (k)P D (k)+F C (k)P C (k)＝0
where k represents the kth sampling period of the energy router; p (P) G (k)，P F (k)、P Y (k)、P D (k)、P C (k) The power supply system sequentially comprises photovoltaic side input power, wind power side input power, user side output power, power grid side input power and energy storage side input power, and the specific expression forms of the power supply system are as follows:
P G (k)＝U G (k)I G (k)
P F (k)＝U F (k)I F (k)
P D (k)＝U D (k)I D (k)
P C (k)＝U C (k)I C (k)
P Y (k)＝U 220V (k)I 220V (k)+U 12V (k)I 12V (k)+U 36V (k)I 36V (k)
wherein U is G (k)、I G (k)、U F (k)、I F (k)、U D (k)、I D (k)、U C (k)、I C (k)、U 220V (k)、I 220V (k)、U 12V (k)、 I 12V (k)、U 36V (k)、I 36V (k) The system comprises a photovoltaic side voltage sampling value, a photovoltaic side current sampling value, a wind power side voltage sampling value, a wind power side current sampling value, a power grid side voltage sampling value, a power grid side current sampling value, an energy storage side voltage sampling value, an energy storage side current sampling value, a household single-phase alternating-current load side voltage sampling value, a household single-phase alternating-current load side current sampling value, a direct-current load 1 side voltage sampling value with working voltage being safe voltage, a direct-current load 1 side current sampling value with working voltage being safe voltage, a direct-current load 2 side voltage sampling value with working voltage being safe voltage and a direct-current load 2 side current sampling value with working voltage being safe voltage. The normal mode uses grid voltage to maintain the stability of the low voltage dc bus voltage in the energy router.
F as described above C (k)、F D (k) The energy storage module is respectively a mode switching function, the working state of the energy storage module is the power supply state for the energy router when the value is larger than 0, and the energy storage module is in the charging state when the value is smaller than 0, namely the energy router charges the energy storage module, F C (k)、F D (k) The specific expression form is as follows:
the delta P is a constant difference value of the energy router, and the specific expression form is as follows when the wind power generation is not connected:
ΔP(k)＝P G (k)-P Y (k)
the concrete expression form when the wind power generation is connected is as follows:
ΔP(k)＝P G (k)+P F (k)-P Y (k)
the power grid fault mode is used for controlling the running state of the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit to be in a constant voltage mode so as to maintain the voltage stability of a direct current bus, and controlling the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit, the first full-bridge SRC resonant soft switch unidirectional DC/DC conversion unit and the single-phase full-bridge inversion unit to be in a conduction mode; as will be readily understood by those skilled in the art, when the energy router of the present invention further includes a scalable unit, that is, further includes the single-phase full-bridge rectifying unit and the second full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit, the power grid fault mode also needs to control the single-phase full-bridge rectifying unit and the second full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit to be in a conducting mode; controlling the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit to be in a non-conduction mode; if the output power of the distributed energy source is smaller than the power required by the user alternating current load, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a fourth conduction mode, if the output power of the user renewable energy source is larger than or equal to the power required by the user single-phase alternating current load and smaller than the total power required by the user load, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a third conduction mode, if the output power of the user renewable energy source is equal to the total power required by the user load or the output power of the user renewable energy source is larger than the total power required by the user load and the energy storage module is full, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a second conduction mode, and if the output power of the user renewable energy source is larger than the total power required by the user load and the energy storage module is not full-full, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in the first conduction mode;
If P is not connected with wind power generation G (k)-P Y (k)+F C (k)P C (k) < 0 or if P in the event of power generation by an access force G (k)+P F (k)-P Y (k)+F C (k)P C (k) < 0, cut off the current customer load and fullThe following expressions are used:
if P is not connected with wind power generation G (k)-P Y (k)+F C (k)P C (k) And (3) if the energy output is more than 0, controlling the distributed energy output to meet the following expression: p (P) G (k)-P Y (k)+F C (k)P C (k)＝0
Or if P is in the condition of power generation by the connection force G (k)+P F (k)-P Y (k)+F C (k)P C (k) And (3) if the energy output is more than 0, controlling the distributed energy output to meet the following expression:
P G (k)+P F (k)-P Y (k)+F C (k)P C (k)＝0
if P is not connected with wind power generation G (k)-P Y (k)+F C (k)P C (k) >0 and P C (k) If P in case of=0 or power generation G (k)+P F (k)-P Y (k)+F C (k)P C (k) >0 and P C (k) And (4) restoring normal power supply of all load interfaces.
The power grid fault mode adopts the operation state of an energy storage module to maintain the stability of the low-voltage direct-current bus voltage of the energy router, the low-voltage direct-current bus voltage can change when a load is connected or disconnected, the energy storage module is charged according to the comparison of the residual capacity (SOC) of the energy storage module and 0.6, when the SOC is larger than 0.6, the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit adopts a constant-voltage mode, and when the SOC is lower than 0.6, the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit adopts a constant-current mode. Meanwhile, in order to ensure the safety of the energy storage module, the safety working range of the energy storage module is set to be 0.95> SOC >0.05 so as to ensure the service life of the energy storage module. The constant voltage mode and the constant current mode during charging are specifically as follows:
Charge constant voltage mode (SOC > 0.6):
U Cref (k)＝U C * -mΔP(k-1)
m in the above formula is a given constant voltage charging coefficient,U U 、U Cref 、U、K P 、K i the method comprises the steps of respectively obtaining a rated charging voltage value of an energy storage module (depending on the working state of the energy storage module), a reference voltage value of a first output end of a full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit, input voltage deviation of an input end of the full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit, an actual voltage value of the energy storage module, a given voltage proportional coefficient and a given voltage integral coefficient.
Charging constant current mode (SOC < 0.6):
I Cref (k)＝I C * -nΔP(k-1)
n in the above formula is a given constant current charging coefficient,U I 、I Cref 、I、K P 、K i the reference current value of the first output end of the full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit, the input current difference of the input end of the full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit, the actual current value of the energy storage module, the given current proportional coefficient and the given current integral coefficient are respectively obtained.
Discharge constant voltage mode:
U ZCref (k)＝U ZC * -bΔP(k-1)
b in the above formula is a given coefficient,U ZU 、U ZCref 、U Z 、K P 、K i the method comprises the steps of respectively obtaining a rated value of a low-voltage direct-current bus, a reference voltage value of a first output end of a full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit, input voltage deviation of an input end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit, an actual voltage value of the low-voltage direct-current bus, a given voltage proportional coefficient and a given voltage integral coefficient.
When the energy storage module is in a cut-off working state, if the state of SOC is more than 0.95, the side voltage of the household single-phase alternating-current power grid is reduced, and if the state of SOC is less than 0.05, the side voltage of the household single-phase alternating-current power grid is increased to stabilize the voltage fluctuation of the low-voltage direct-current bus. The following is shown:
wherein U is Dref 、U Z 、U Zref The method comprises the steps of outputting a voltage reference value at the side of a household single-phase alternating-current power grid, and outputting a voltage actual value at the side of a low-voltage direct-current bus and a voltage reference value at the side of the low-voltage direct-current bus.
The active power-off mode controls the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, the full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit, the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, the first full-bridge SRC resonance soft switch Guan Shanxiang DC/DC conversion unit, the single-phase full-bridge bidirectional interconnection conversion unit and the single-phase full-bridge inversion unit to be in a non-conduction mode. As will be readily understood by those skilled in the art, when the energy router of the present invention further includes an expandable unit, that is, further includes the single-phase full-bridge rectifying unit and the second full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit, the active power-off mode also needs to control the single-phase full-bridge rectifying unit and the second full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit to be in a non-conductive mode;
The energy router energy flow path allocated based on the energy routing algorithm with minimum cost should satisfy the following conditions:
P Y (k)＝P Y_12DC (k)+P Y_36DC (k)+P Y_220AC (k)；
P G (k)＝P G_12DC (k)+P G_36DC (k)+P G_220AC (k)+P G_C (k)；
P C (k)＝P C_12DC (k)+P C_36DC (k)+P C_220AC (k)-P G_C (k)；
P D (k)＝P D_12DC (k)+P D_36DC (k)+P D_220AC (k)+P D_C (k) The method comprises the steps of carrying out a first treatment on the surface of the And
when the wind power generation is switched in,
P F (k)＝P F_12DC (k)+P F_36DC (k)+P F_220AC (k)+P F_C (k)，
P C (k)＝P C_12DC (k)+P C_36DC (k)+P C_220AC (k)-P G_C (k)-P F_C (k)；
wherein P is Y_12DC (k)、P Y_36DC (k)、P Y_220AC (k) The total power supply required by the dc load 2 with the working voltage being the safe voltage, that is, the 12V dc load of the present embodiment, the total power supply required by the dc load 1 with the working voltage being the safe voltage, that is, the 36V dc load of the present embodiment, and the total power supply required by the household single-phase ac load, that is, the 220V ac load of the present embodiment are sequentially set; p (P) G_12DC (k)、P C_12DC (k)、P F_12DC (k)、P D_12DC (k) The photovoltaic power supply power required by the direct current load 2 with the working voltage being the safety voltage, namely the 12V direct current load of the embodiment, the energy storage power supply power required by the direct current load 2 with the working voltage being the safety voltage, the wind power supply power required by the direct current load 2 with the working voltage being the safety voltage and the power grid power supply power required by the direct current load 2 with the working voltage being the safety voltage are respectively provided; p (P) G_36DC (k)、P C_36DC (k)、P F_36DC (k)、P D_36DC (k) Respectively the working voltages are safeThe voltage direct current load 1 is photovoltaic power supply power required by the 36V direct current load, energy storage power supply power required by the direct current load 1 with the working voltage being the safety voltage, wind power supply power required by the direct current load 1 with the working voltage being the safety voltage, and power grid power supply power required by the direct current load 1 with the working voltage being the safety voltage; p (P) G_220AC (k)、P C_220AC (k)、P F_220AC (k)、P D_220AC (k) The photovoltaic power supply power required by the household single-phase alternating-current load, namely the 220V alternating-current load in the embodiment, the energy storage power supply power required by the household single-phase alternating-current load, the wind power supply power required by the household single-phase alternating-current load and the power grid power supply power required by the household single-phase alternating-current load are respectively adopted; p (P) G_C (k)、P F_C (k)、P D_C (k) The photovoltaic power supply power required by the energy storage module, the wind power supply power required by the energy storage module and the household single-phase alternating current power grid power supply power required by the energy storage module are sequentially respectively provided; and
P Y_12DC (k)＝P G_12DC (k)η 2 η 3 η 4 +P C_12DC (k)η 3 η 4 +P D_12DC (k)η 1 η 3 η 4 η 7
P Y_36DC (k)＝P G_36DC (k)η 2 η 3 +P C_36DC (k)η 3 +P D_36DC (k)η 1 η 3 η 7
P Y_220AC (k)＝P G_220AC (k)η 1 η 2 η 8 +P C_220AC (k)η 3 η 8 +P D_220AC (k)η 1 η 7 η 8
when wind power generation is connected, the following steps are performed:
P Y_12DC (k)＝P G_12DC (k)η 2 η 3 η 4 +P C_12DC (k)η 3 η 4 +P F_12DC (k)η 3 η 4 η 5 η 6 +P D_12DC (k)η 1 η 3 η 4 η 7
P Y_36DC (k)＝P G_36DC (k)η 2 η 3 +P C_36DC (k)η 3 +P F_36DC (k)η 3 η 5 η 6 +P D_36DC (k)η 1 η 3 η 7
P Y_220AC (k)＝P G_220AC (k)η 1 η 2 η 8 +P C_220AC (k)η 3 η 8 +P F_220AC (k)η 5 η 7 η 8 +P D_220AC (k)η 1 η 7 η 8
wherein eta 1 、η 2 、η 3 、η 4 、η 5 、η 6 、η 7 、η 8 The full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, the full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit, the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit, the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit, the single-phase full-bridge rectification unit, the single-phase full-bridge bidirectional interconnection conversion unit and the single-phase full-bridge inversion unit respectively.
min{P D (k)+P C (k) The energy distribution path corresponding to the energy distribution path is the energy routing path with the minimum cost.
It should be understood that the foregoing in the description of the invention is only illustrative of the invention. Various modifications and substitutions of the described embodiments may be made by those skilled in the art without departing from the spirit of the invention, and the scope of the invention is defined by the appended claims.

Claims (10)

1. The household alternating current-direct current hybrid bidirectional electric energy interaction energy router is characterized by comprising a single-phase full-bridge bidirectional interconnection conversion unit, a full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, a full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit, a full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, a first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit, a single-phase full-bridge inversion unit and a low-voltage direct current bus;
the input end of the single-phase full-bridge bidirectional interconnection conversion unit is connected with a household single-phase alternating current power grid, and the output end of the single-phase full-bridge bidirectional interconnection conversion unit is connected with the input end of the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit; the output end of the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus; the input end of the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit is connected with a photovoltaic assembly, and the output end of the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus; the input end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus, the first output end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit is connected with the energy storage module, and the second output end of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit is connected with the direct-current load 1 with safe working voltage and the input end of the first full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit; the output end of the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit is connected with a direct-current load 2 with working voltage being safe voltage; the input end of the single-phase full-bridge inversion unit is connected with the low-voltage direct-current bus, and the output end of the single-phase full-bridge inversion unit is connected with an alternating-current load of single-phase alternating-current voltage for users; the working voltage of the direct current load 1 is larger than the working voltage of the direct current load 2;
The single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit cooperatively realize bidirectional electric energy interaction between a household single-phase alternating current power grid and a low-voltage direct current bus;
the full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit is used for realizing power conversion of converting direct-current voltage output by the photovoltaic assembly into low-voltage direct-current bus voltage;
the full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit is used for realizing the mutual conversion among the low-voltage DC bus voltage, the energy storage module voltage and the voltage required by the DC load 1 with the working voltage being the safety voltage, and providing the required DC voltage for the energy storage module or the DC load 1 with the working voltage being the safety voltage;
the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit converts direct current required by the direct current load 1 with the working voltage being the safety voltage into power conversion of direct current required by the direct current load 2 with the working voltage being the safety voltage, and provides the required direct current voltage for the direct current load 2 with the working voltage being the safety voltage;
the single-phase full-bridge inversion unit is used for converting the low-voltage direct-current bus voltage into power conversion of household single-phase alternating current, and providing the required alternating current voltage for the household single-phase alternating current load.
2. The household alternating current-direct current hybrid bidirectional electric energy interaction energy router according to claim 1, further comprising a single-phase full-bridge rectifying unit and a second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit, wherein the input end of the single-phase full-bridge rectifying unit is connected with a wind driven generator, and the output end of the single-phase full-bridge rectifying unit is connected with the input end of the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit; the output end of the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit is connected with the low-voltage direct-current bus; and
the single-phase full-bridge rectification unit is used for realizing the power conversion of alternating current output by the wind driven generator into low-voltage direct current;
the second full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit is used for realizing power conversion from low-voltage direct-current voltage at the output end of the single-phase full-bridge rectification unit to low-voltage direct-current bus voltage.
3. The household ac/DC hybrid bidirectional power interactive energy router of claim 1, wherein the full-bridge LLC resonant soft-switching unidirectional DC/DC conversion unit, the first full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit, and the single-phase full-bridge inverter unit all have a conducting mode and a non-conducting mode, wherein the conducting mode is a power/active power flow from an input end to an output end, and the non-conducting mode is a no-power flow;
The full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit and the single-phase full-bridge bidirectional interconnection conversion unit are provided with a forward conduction mode, a reverse conduction mode and a non-conduction mode, wherein the forward conduction mode is that energy flows from an input end to an output end; the reverse conduction mode is that energy flows from an output end to an input end; the non-conductive mode is no energy flow;
the full-bridge LCLL resonance soft-switching three-port bidirectional DC/DC conversion unit is provided with a first conduction mode, a second conduction mode, a third conduction mode, a fourth conduction mode, a fifth conduction mode and a non-conduction mode, wherein the first conduction mode is that energy flows from an input end to a first output end and a second output end at the same time, the second conduction mode is that energy flows from the input end to the second output end, the third conduction mode is that energy flows from the input end to the first output end to the second output end, the fourth conduction mode is that energy flows from the first output end to the input end to the second output end, the fifth conduction mode is that energy flows from the input end to the first output end, and the non-conduction mode is that no energy flows.
4. The household ac/DC hybrid bi-directional power interactive energy router of claim 2, wherein the single-phase full-bridge rectifier unit and the second full-bridge SRC resonant soft-switching unidirectional DC/DC converter unit each have a conducting mode and a non-conducting mode, wherein the conducting mode is a power/active power flow from an input terminal to an output terminal, and the non-conducting mode is a no-power flow.
5. A consumer ac-DC hybrid bi-directional power interactive energy router according to claim 3, wherein said full-bridge LCLL resonant soft-switching three-port bi-directional DC/DC conversion unit comprises: the full-bridge LCLL resonance module, the high-frequency transformer T3, the full-bridge rectification module, the full-wave rectification module and the buck-boost circuit module; the high-frequency transformer T3 is provided with a primary inductor, a first secondary inductor and a second secondary inductor;
the input end of the full-bridge LCLL resonance module is connected with the low-voltage direct-current bus, and the output end of the full-bridge LCLL resonance module is connected with the primary inductor of the high-frequency transformer T3; the input end of the full-bridge rectifier module is connected with the first secondary inductor of the high-frequency transformer T3, and the output end of the full-bridge rectifier module is used as the first output end of the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit to be connected with the energy storage module; the input end of the full-wave rectifying module is connected with the second secondary inductor of the high-frequency transformer T3, and the output end of the full-wave rectifying module is used as the second output end of the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit and is connected with the input end of the buck-boost circuit module; and the output end of the buck-boost circuit module is connected with a direct current load 1 with the working voltage being a safe voltage.
6. The household ac/dc hybrid bidirectional power interactive energy router according to claim 5, wherein the full-bridge LCLL resonance module comprises a MOS transistor Q21, a MOS transistor Q22, a MOS transistor Q23, a MOS transistor Q24, an additional inductance La, a resonance inductance Lr3, a resonance capacitance Cr3, and an excitation inductance Lm3; the drain electrode of the Q21 is connected with the drain electrode of the Q23 and the positive electrode of the low-voltage direct current bus, the source electrode of the Q21 is connected with the drain electrode of the Q22, one end of the Lr3 and one end of the La, the source electrode of the Q22 is connected with the source electrode of the Q24 and the negative electrode of the low-voltage direct current bus, the other end of the Lr3 is connected with one end of the Cr3, the other end of the Cr3 is connected with one end of the Lm3, the other end of the Lm3 is connected with the other end of the La, the source electrode of the Q23 and the drain electrode of the Q24, and the Lm3 is connected with the primary inductor of the high-frequency transformer T3 in parallel;
the full-wave rectification module comprises a synchronous rectifying tube SR3, a synchronous rectifying tube SR4 and a capacitor C5; the buck-boost circuit module comprises a MOS tube Q29, an inductor L3, a diode D2 and a capacitor C7; the center tap of the second secondary inductor of the high-frequency transformer T3 is connected with the positive electrode of the C5 and the drain electrode of the Q29, one end of the second secondary inductor of the high-frequency transformer T3 is connected with the drain electrode of the SR3, the other end of the second secondary inductor of the high-frequency transformer T3 is connected with the drain electrode of the SR4, the source electrode of the SR3 is connected with the source electrode of the SR4, the negative electrode of the C5, one end of the L3 and the positive electrode of the C7, the source electrode of the Q29 is connected with the other end of the L3 and the negative electrode of the D2, the positive electrode of the D2 is connected with the negative electrode of the C7, and the capacitor C7 is connected with the direct-current load 1 with the working voltage being a safe voltage and the first full-bridge SRC resonant soft-switching unidirectional DC/DC conversion unit in parallel;
The full-bridge rectification module comprises a MOS tube Q25, a MOS tube Q26, a MOS tube Q27, a MOS tube Q28 and a capacitor C6; the source electrode of the Q25 is connected with the drain electrode of the Q26 and one end of the first secondary inductor of the high-frequency transformer T3; the source electrode of the Q27 is connected with the drain electrode of the Q28 and the other end of the first secondary inductor of the high-frequency transformer T3; the drain electrode of the Q25 is connected with the drain electrode of the Q27 and the anode of the C6, the source electrode of the Q26 is connected with the source electrode of the Q28 and the cathode of the C6, and the C6 is connected with the energy storage module in parallel; the control signals of Q21, Q22, Q23, Q24, Q25, Q26, Q27 and Q28 are modulated by PFM; the control signal of Q29 adopts PWM modulation.
7. The energy scheduling method based on the household alternating current-direct current hybrid bidirectional electric energy interaction energy router is characterized by dynamically adjusting the working mode of the energy router according to the distributed renewable energy power generation state and the household electricity consumption demand, wherein the working mode of the energy router comprises a normal mode, a power grid fault mode and an active power failure mode; under the normal electricity utilization condition of the household, when the voltage of the household single-phase alternating-current power grid is larger than a fault voltage threshold value and the duration time is larger than an anti-shake time threshold value, the energy router is controlled to work in a normal mode, and when the voltage of the household single-phase alternating-current power grid is smaller than or equal to the fault voltage threshold value and the duration time is larger than or equal to the anti-shake time threshold value, the energy router is controlled to work in a power grid fault mode; under the home active power down condition, the energy router is controlled to work in an active power down mode.
8. The energy scheduling method based on the user ac/dc hybrid bidirectional electric energy interaction energy router according to claim 7, wherein the normal mode: controlling the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit, the first full-bridge SRC resonant soft switch unidirectional DC/DC conversion unit and the single-phase full-bridge inversion unit to be in a conduction mode; if the energy storage module is full, controlling the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit to be in a second conduction mode, otherwise, in a first conduction mode; if the output power of the distributed energy source is larger than the total power required by the household load and the energy storage module, the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switching bidirectional DC/DC conversion unit are controlled to be in a reverse conduction mode, if the output power of the distributed energy source is equal to the total power required by the household load and the energy storage module, the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switching bidirectional DC/DC conversion unit are controlled to be in a non-conduction mode, and if the output power of the distributed energy source is smaller than the total power required by the household load and the energy storage module, the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft-switching bidirectional DC/DC conversion unit are controlled to be in a forward conduction mode;
The grid fault mode: controlling the running state of the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a constant-voltage mode so as to maintain the voltage stability of a direct-current bus; controlling the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit, the first full-bridge SRC resonant soft switch unidirectional DC/DC conversion unit and the single-phase full-bridge inversion unit to be in a conduction mode; controlling the single-phase full-bridge bidirectional interconnection conversion unit and the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit to be in a non-conduction mode; if the output power of the distributed energy source is smaller than the power required by the user alternating current load, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a fourth conduction mode, if the output power of the user renewable energy source is larger than or equal to the power required by the user single-phase alternating current load and smaller than the total power required by the user load, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a third conduction mode, if the output power of the user renewable energy source is equal to the total power required by the user load or the output power of the user renewable energy source is larger than the total power required by the user load and the energy storage is full, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in a second conduction mode, and if the output power of the user renewable energy source is larger than the total power required by the user load and the energy storage module is not full, controlling the full-bridge LCLL resonant soft-switching three-port bidirectional DC/DC conversion unit to be in the first conduction mode;
The active power down mode: the full-bridge SRC resonance soft switch bidirectional DC/DC conversion unit, the full-bridge LLC resonance soft switch unidirectional DC/DC conversion unit, the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, the first full-bridge SRC resonance soft switch unidirectional DC/DC conversion unit, the single-phase full-bridge bidirectional interconnection conversion unit and the single-phase full-bridge inversion unit are controlled to be in a non-conductive mode.
9. The energy scheduling method based on the user ac/dc hybrid bi-directional power interactive energy router according to claim 8, wherein in the grid fault mode, if P G (k)-P Y (k)+F C (k)P C (k) < 0, then the current customer load is cut off and the following expression is satisfied:
if P G (k)-P Y (k)+F C (k)P C (k) And (3) if the energy output is more than 0, controlling the distributed energy output to meet the following expression:
P G (k)-P Y (k)+F C (k)P C (k)＝0
if P G (k)-P Y (k)+F C (k)P C (k) > 0 and P C (k) =0, then normal power supply of all load interfaces is restored;
in the above, U 220V (k)、I 220V (k)、U 12V (k)、I 12V (k)、U 36V (k)、I 36V (k) The method comprises the steps of sequentially sampling a voltage value at a single-phase alternating-current load side, sampling a current value at a household single-phase alternating-current load side, sampling a voltage value at a direct-current load 1 side, sampling a current value at a direct-current load 1 side, sampling a voltage value at a direct-current load 2 side, and sampling a current value at a direct-current load 2 side, wherein the working voltage of the voltage value is safe; p (P) G (k)、P Y (k)、P C (k) In turn, photovoltaic side input power, user side output powerAnd energy storage side input power; f (F) C (k) Is a mode switching function:
wherein Δp is a constant difference of the energy router, and the expression Δp (k) =p G (k)-P Y (k)；
The power grid fault mode adopts an operation state of an energy storage module to maintain the stability of the low-voltage direct-current bus voltage of the energy router, when the residual capacity SOC of a battery is larger than 0.6 when the energy storage module is charged, the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit adopts a constant-voltage mode, and when the SOC is lower than 0.6, the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit adopts a constant-current mode; meanwhile, the safety working range of the energy storage module is set to be 0.95> SOC >0.05 so as to ensure the service life of the energy storage module;
the constant voltage mode when the energy storage module charges is:
U Cref (k)＝U C * -mΔP(k-1)
in the above formula, m is a given constant voltage charging coefficient;U U 、U Cref 、U、K P 、K i the method comprises the steps of respectively obtaining a rated charging voltage value of an energy storage module, a reference voltage value of a first output end of a full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, input voltage deviation of an input end of the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, an actual voltage value of the energy storage module, a given voltage proportional coefficient and a given voltage integral coefficient;
The constant current mode when the energy storage module is charged is as follows:
I Cref (k)＝I C * -nΔP(k-1)
in the above formula, n is a given constant current charging coefficient;U I 、I Cref 、I、K P 、K i the method comprises the steps of respectively obtaining a rated current value of an energy storage module, a reference current value of a first output end of a full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, an input current difference of an input end of the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, an actual current value of the energy storage module, a given current proportional coefficient and a given current integral coefficient;
constant voltage mode when energy storage module discharges:
U ZCref (k)＝U ZC * -bΔP(k-1)
in the above formula, b is a given coefficient;U ZU 、U ZCref 、U Z 、K P 、K i the method comprises the steps of respectively obtaining a rated value of a low-voltage direct-current bus, a reference voltage value of a first output end of a full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, input voltage deviation of an input end of the full-bridge LCLL resonance soft switch three-port bidirectional DC/DC conversion unit, an actual voltage value of the low-voltage direct-current bus, a given voltage proportional coefficient and a given voltage integral coefficient;
when the energy storage module is in a cut-off working state, if the SOC is more than 0.95, the side voltage of the household single-phase alternating-current power grid is reduced, and if the SOC is less than 0.05, the side voltage of the household single-phase alternating-current power grid is increased to stabilize the voltage fluctuation of the low-voltage direct-current bus, as follows:
wherein U is Dref 、U Z 、U Zref The method comprises the steps of outputting a voltage reference value at the side of a household single-phase alternating-current power grid, and outputting a voltage actual value at the side of a low-voltage direct-current bus and a voltage reference value at the side of the low-voltage direct-current bus.
10. The energy scheduling method based on the household alternating current-direct current hybrid bidirectional electric energy interaction energy router according to claim 9, wherein the energy scheduling method is used for realizing intelligent coordination distribution of household electricity based on an energy routing algorithm with minimum cost in the normal mode and the power grid fault mode, and the energy flow path distributed based on the energy routing algorithm with minimum cost meets the following conditions:
P Y (k)＝P Y_12DC (k)+P Y_36DC (k)+P Y_220AC (k)
P G (k)＝P G_12DC (k)+P G_36DC (k)+P G_220AC (k)+P G_C (k)
P C (k)＝P C_12DC (k)+P C_36DC (k)+P C_220AC (k)-P G_C (k)-P F_C (k)
P D (k)＝P D_12DC (k)+P D_36DC (k)+P D_220AC (k)+P D_C (k)
wherein min { P D (k)+P C (k) The energy distribution path corresponding to the energy distribution path is the energy routing path with the minimum cost; p (P) G (k)、P Y (k)、P D (k)、P C (k) The power supply system comprises photovoltaic side input power, user side output power, grid side input power and energy storage side input power in sequence; p (P) Y_12DC (k)、P Y_36DC (k)、P Y_220AC (k) The total power supply power required by the direct current load 2, the total power supply power required by the direct current load 1 and the total power supply power required by the household single-phase alternating current load are sequentially set; p (P) G_12DC (k)、P C_12DC (k)、P D_12DC (k) The photovoltaic power supply power, the energy storage power supply power and the power grid power supply power which are required by the direct current load 2 are respectively provided; p (P) G_36DC (k)、P C_36DC (k)、P D_36DC (k) The photovoltaic power supply power, the energy storage power supply power and the power grid power supply power which are required by the direct current load 1 are respectively provided; p (P) G_220AC (k)、P C_220AC (k)、P D_220AC (k) The photovoltaic power supply power, the energy storage power supply power and the power grid power supply power required by the household single-phase alternating current load are respectively provided; p (P) G_C (k)、P F_C (k)、P D_C (k) The photovoltaic power supply power required by the energy storage module, the wind power supply power required by the energy storage module and the household single-phase alternating current power grid power supply power required by the energy storage module are sequentially respectively provided; and
P Y_12DC (k)＝P G_12DC (k)η 2 η 3 η 4 +P C_12DC (k)η 3 η 4 +P D_12DC (k)η 1 η 3 η 4 η 7 ；
P Y_36DC (k)＝P G_36DC (k)η 2 η 3 +P C_36DC (k)η 3 +P D_36DC (k)η 1 η 3 η 7 ；
P Y_220AC (k)＝P G_220AC (k)η 1 η 2 η 8 +P C_220AC (k)η 3 η 8 +P D_220AC (k)η 1 η 7 η 8 ；
wherein eta 1 、η 2 、η 3 、η 4 、η 7 、η 8 The full-bridge SRC resonant soft switch bidirectional DC/DC conversion unit, the full-bridge LLC resonant soft switch unidirectional DC/DC conversion unit, the full-bridge LCLL resonant soft switch three-port bidirectional DC/DC conversion unit, the first full-bridge SRC resonant soft switch unidirectional DC/DC conversion unit, the single-phase full-bridge bidirectional interconnection conversion unit and the single-phase full-bridge inversion unit respectively.
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CN110912187A (en) * 2019-11-27 2020-03-24 西安理工大学 Transmission power-based coordination control method for user side electric energy router
CN111817566A (en) * 2020-06-10 2020-10-23 天津大学 LLCT resonant bidirectional DC converter

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