CN111509830B - Topological structure of miniature photovoltaic/energy storage intelligent power station - Google Patents

Topological structure of miniature photovoltaic/energy storage intelligent power station Download PDF

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CN111509830B
CN111509830B CN202010358297.4A CN202010358297A CN111509830B CN 111509830 B CN111509830 B CN 111509830B CN 202010358297 A CN202010358297 A CN 202010358297A CN 111509830 B CN111509830 B CN 111509830B
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switch tube
source
electrode
tube
switching tube
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CN111509830A (en
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汪诚
彭合
李磊
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/10—The network having a local or delimited stationary reach
    • H02J2310/18—The network being internal to a power source or plant
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a topological structure of a miniature photovoltaic/energy storage intelligent power station, which comprises a hybrid power unit and a secondary power conversion unit, and provides a three-phase 380V-10 kV adjustable power frequency (50Hz/60Hz) alternating current high-voltage port, a 400V-1 kV direct current high-voltage port, a 0-400V direct current low-voltage port and a single-phase 0-240V power frequency (50Hz/60Hz) alternating current low-voltage port. The hybrid power unit comprises a photovoltaic power generation subunit, a battery energy storage subunit and a power compensation subunit. The micro photovoltaic/energy storage intelligent power station can assist the frequency modulation and voltage regulation of the power distribution network, can provide high-quality voltage sources for various alternating current and direct current loads which are not more than 50kW at most, can realize high-level output, can be connected to a medium-voltage power distribution network without a power frequency transformer, and can ensure the quality of grid-connected current by using smaller filter inductance. The hybrid power unit provided by the invention is easy to modularly expand, so that the hybrid power unit can be suitable for occasions with higher voltage level and higher power.

Description

Topological structure of miniature photovoltaic/energy storage intelligent power station
Technical Field
The invention belongs to the fields of distributed comprehensive power systems and energy management strategies thereof, new energy power generation, power electronic converters and advanced control thereof, and particularly relates to a topological structure of a miniature photovoltaic/energy storage intelligent power station.
Background
A distributed comprehensive energy system is an energy system which effectively and reliably associates power generation, energy storage and power utilization through a specific topological network and terminal power equipment. With the introduction of the concept of global energy internet, distributed integrated energy systems of various types, various forms, and various scales are rapidly developing. The power electronic converter modularization technology not only enriches the circuit form of each type of distributed energy sources merged into the power grid, but also improves the power density and the operation efficiency of a distributed energy source interconnection/grid-connected system. The patent provides a miniature photovoltaic/energy storage intelligent power station topological structure based on a power electronic converter, and provides a topological relation with high power density among distributed photovoltaic power generation, battery energy storage, various low-voltage load power supplies and medium-voltage power distribution networks. This patent has also provided an alternating current-direct current linkage energy management strategy, has guaranteed that each unit distributes independently operation, has improved operating efficiency and nimble degree.
Disclosure of Invention
The invention aims to provide a topological structure of a miniature photovoltaic/energy storage intelligent power station.
The technical solution for realizing the purpose of the invention is as follows: a topological structure of a miniature photovoltaic/energy storage intelligent power station is characterized by comprising three phases a, b and c with the same structure, wherein each phase comprises N mixed power units, a direct current bus and a DAB output filter;
the N mixed power units are sequentially connected through the compensation switch, the direct-current output end of each mixed power unit is connected with a direct-current bus, the direct-current bus is respectively connected with a DAB output filter a10, the DAB output filter is connected with the input end of an output DC/AC structure, the alternating-current voltage output end of each phase of mixed power unit is connected with a high-voltage alternating-current side, and the alternating-current voltage neutral point output end of each phase of mixed power unit is connected with a point O.
Preferably, each hybrid power unit comprises a photovoltaic power generation subunit, a power compensation subunit, a battery energy storage subunit and a compensation switch;
the positive electrode and the negative electrode of the direct current output side of the photovoltaic power generation electronic unit are respectively connected with the positive electrode and the negative electrode of the direct current input side of the power compensation subunit, the positive electrode of the direct current output side of the photovoltaic power generation electronic unit is connected with the positive electrode of the direct current output side of the battery energy storage subunit through a compensation switch, and one end of the alternating current output side of the photovoltaic power generation electronic unit is connected with one end of the alternating current output side of the battery energy storage subunit.
Preferably, the photovoltaic power generation subunit comprises an H bridge and an electrolytic capacitor Cp1Double active bridge, electrolytic capacitor Cp2And a solar photovoltaic panel;
the positive and negative poles of the H bridge are respectively connected with the electrolytic capacitor Cp1The positive and negative electrodes of the electrolytic capacitor C are connectedp1The positive and negative poles of the double-active bridge are respectively connected with the positive and negative poles of the direct current output side of the double-active bridge, and the positive and negative poles of the direct current input side of the double-active bridge are respectively connected with the electrolytic capacitor Cp2The positive and negative electrodes of the electrolytic capacitor C are connectedp2The positive and negative poles of the solar photovoltaic panel are respectively connected with the port voltage of the solar photovoltaic panelThe positive and negative electrodes of the anode and the cathode are connected.
Preferably, the dual active bridge comprises 8 switching tubes Sp5～Sp12High frequency inductor Lp1Primary winding Lp2And a secondary winding Lp3；
The switch tube Sp5Source and switch tube Sp6Connection of drain, switching tube Sp7Source and switching tube Sp8Drain electrode connection, the high-frequency inductor Lp1One end of and a switch tube Sp5Source electrode connection, the high-frequency inductor Lp1The other end of (2) and the primary coil Lp2Is connected to the primary winding Lp2The other end of the switch tube Sp7Source electrode connection, switching tube Sp9Source and switching tube Sp10Drain electrode connection, switching tube Sp11Source and switching tube Sp12Drain electrode connected to the secondary winding Lp3One end of and a switch tube Sp9Source electrode connection, the secondary winding Lp3The other end of the switch tube Sp11Source electrode connection, switching tube Sp9Drain electrode of (1) and switching tube Sp11Is connected to the drain of the switching tube Sp10Source electrode of (1) and switching tube Sp12Is connected to the source of the switching tube Sp5Drain and switch tube Sp6The source electrodes are respectively used as double active bridges, the switch tube Sp11Drain and switch tube Sp12And the source electrodes are respectively used as the positive electrode and the negative electrode of the direct current input side of the double active bridges.
Preferably, the power compensation subunit comprises a dual active bridge and an electrolytic capacitor Cd1The positive electrode and the negative electrode of the direct current output side of the double active bridges are respectively connected with the electrolytic capacitor Cd1The positive and negative electrodes of the anode and the cathode are connected.
Preferably, the battery energy storage subunit comprises an H bridge and an electrolytic capacitor Cb1Double active bridge, electrolytic capacitor Cb2And a battery;
the positive and negative poles of the H bridge are respectively connected with the electrolytic capacitor Cb1The positive and negative electrodes of the electrolytic capacitor C are connectedb1The positive and negative poles of the double-active bridge direct current input side are respectively connected with the positive and negative poles of the double-active bridge direct current output side, and the positive and negative poles of the double-active bridge direct current input side are respectively connected with the electricityCapacitor Cb2The positive and negative electrodes of the electrolytic capacitor C are connectedb2The positive and negative poles of the battery are respectively connected with the positive and negative poles of the voltage of the battery port.
Preferably, the DAB output filter is a double active bridge including a switching tube Si1～Si8High frequency inductor Li1Primary winding Li2And a secondary winding Li3；
The switch tube Si1Source electrode and switch tube Si2Is connected to the drain of the switching tube Si2Source electrode and switch tube Si4Is connected to the source of the switching tube Si4Drain electrode of and switch tube Si3Is connected to the source of the switching tube Si3Drain electrode of and switch tube Si1Is connected to the drain of the switching tube Si5Source electrode and switch tube Si6Is connected to the drain of the switching tube Si6Source electrode and switch tube Si8Is connected to the source of the switching tube Si8Drain electrode of and switch tube Si7Is connected to the source of the switching tube Si7Drain electrode of and switch tube Si5Is connected to the drain of the switching tube Si1Source and switch tube Si2Connection point of drain electrode and high-frequency inductor Li1Is connected to the high-frequency inductor Li1The other end of (2) and the primary coil Li2Is connected to the primary winding Li2Is connected with a switch tube S at the other endi3Source and switch tube Si4The connection point of the drain electrode is connected with the secondary coil Li3One end of and a switch tube Si5Source and switch tube Si6The connection point of the drain electrode is connected with the secondary coil Li3The other end of the switch tube Si7Source and switch tube Si8The connection point of the drain electrode is connected with the switching tube S of the switching tubei1The drain electrode of the switching tube is connected with the positive electrode of the direct current bus, and the switching tube Si2Is connected to the negative pole of the dc bus.
Preferably, the DAB output filter is a double active bridge including a switching tube Sk1～Sk8High frequency inductor Lk1Primary winding Lk2And a secondary winding Lk3；
The switch tube Sk1Source electrode and switch tube Sk2Is connected to the drain of the switching tube Sk2Source electrode and switch tube Sk4Is connected to the source of the switching tube Sk4Drain electrode of and switch tube Sk3Is connected to the source of the switching tube Sk3Drain electrode of and switch tube Sk1Is connected to the drain of the switching tube Sk5Source electrode and switch tube Sk6Is connected to the drain of the switching tube Sk6Source electrode and switch tube Sk8Is connected to the source of the switching tube Sk8Drain electrode of and switch tube Sk7Is connected to the source of the switching tube Sk7Drain electrode of and switch tube Sk5Is connected to the drain of the switching tube Sk1Source and switch tube Sk2Connection point of drain electrode and high-frequency inductor Lk1Is connected to the high-frequency inductor Lk1The other end of (2) and the primary coil Lk2Is connected to the primary winding Lk2Is connected with a switch tube S at the other endk3Source and switch tube Sk4The connection point of the drain electrode is connected with the secondary coil Lk3One end of and a switch tube Sk5Source and switch tube Sk6The connection point of the drain electrode is connected with the secondary coil Lk3The other end of the switch tube Sk7Source and switch tube Sk8The connection point of the drain electrode is connected with the switching tube S of the switching tubek1The drain electrode of the switching tube is connected with the positive electrode of the direct current bus, and the switching tube Sk2Is connected to the negative pole of the dc bus.
Preferably, the output DC/AC structure comprises n H-bridges, n-1 compensation switches and n electrolytic capacitors C1～Cn；
The positive and negative poles of the n H bridges are respectively connected with the n electrolytic capacitors C1～CnThe anode and the cathode of the Nth electrolytic capacitor are connected, the anode of the Nth electrolytic capacitor is connected with the cathode of the (N-1) th electrolytic capacitor through the compensation switch, and one alternating current output end of the Nth H bridge is connected with the other output end of the (N-1) th H bridge.
Preferably, the compensation switch is implemented as a bidirectional switch formed by two MOSFETs or IGBTs connected in series.
Compared with the prior art, the invention has the following remarkable advantages: the micro photovoltaic/energy storage intelligent power station can assist in frequency and voltage regulation of the power distribution network and can provide high-quality voltage sources for various alternating current and direct current loads. The miniature photovoltaic/energy storage intelligent power station can realize high-level output, can be connected to a medium-voltage distribution network without a power frequency transformer, and can ensure the quality of grid-connected current by using smaller filter inductance. The hybrid power unit provided by the invention is easy to modularly expand, so that the hybrid power unit can be suitable for occasions with higher voltage level and higher power.
The present invention is described in further detail below with reference to the attached drawing figures.
Drawings
FIG. 1 is a miniature photovoltaic/energy storage intelligent power station topology.
FIG. 2 is a block diagram of photovoltaic power generation unit control of a topological structure of a miniature photovoltaic/energy storage intelligent power station.
FIG. 3 is a block diagram of a micro photovoltaic/energy storage intelligent power station topology battery energy storage subunit control.
FIG. 4 is a block diagram of a micro photovoltaic/energy storage intelligent power station topology compensation switch control.
FIG. 5 is a block diagram of a micro photovoltaic/energy storage intelligent power station topology power compensation subunit control.
Fig. 6 is a block diagram of a miniature photovoltaic/energy storage intelligent power station topology H-bridge a1 and H-bridge a6 control.
FIG. 7 is a schematic diagram of a photovoltaic power generation subunit of a micro photovoltaic/energy storage smart power station topology.
Fig. 8 is a schematic diagram of a power compensation subunit of a micro photovoltaic/energy storage smart power station topology.
Fig. 9 is a schematic diagram of a battery energy storage subunit of a micro photovoltaic/energy storage smart power station topology.
Fig. 10 is a schematic diagram of a compensation switch of a micro photovoltaic/energy storage smart power station topology.
Fig. 11 is a schematic diagram of an output DC/AC configuration a12 of a miniature photovoltaic/energy storage smart power station topology.
Detailed Description
In order to more clearly describe the idea, technical solution and advantages of the present invention, the detailed description is shown by the examples and the accompanying drawings. It is to be understood that the embodiments described are only some of the embodiments of the invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, a miniature photovoltaic/energy storage intelligent power station topology comprises three phases a, b and c with identical structures, each phase comprising N hybrid power units (1,..., N), a DC bus (a9), a DAB output filter (a10, a11) and an output DC/AC structure (a 12);
the N hybrid power units (1, 1., N) are connected in sequence through compensation switches, the direct current output end of each hybrid power unit (1, 1., N) is connected with a direct current bus (a9), the direct current bus is respectively connected with the input ends of a DAB output filter a10, a DAB output filter (a11) and an output DC/AC structure (a12), and the alternating current voltage neutral point output end of each phase of hybrid power unit (1) is connected with one point O.
In a further embodiment, as shown in fig. 1, each hybrid power unit comprises a photovoltaic power generation subunit, a power compensation subunit, a battery energy storage subunit, and a compensation switch (a 4);
the positive electrode and the negative electrode of the direct current output side of the photovoltaic power generation electronic unit are respectively connected with the positive electrode and the negative electrode of the direct current input side of the power compensation subunit, the positive electrode of the direct current output side of the photovoltaic power generation electronic unit is connected with the positive electrode of the direct current output side of the battery energy storage subunit through a compensation switch (a4), and one end of the alternating current output side of the photovoltaic power generation electronic unit is connected with one end of the alternating current output side of the battery energy storage subunit.
In a further embodiment, as shown in fig. 7, the photovoltaic power generation subunit comprises an H-bridge (a1), an electrolytic capacitor Cp1A double active bridge (a2) and an electrolytic capacitor Cp2And a solar photovoltaic panel (a 3);
positive of the H bridge (a1)The negative electrode is respectively connected with an electrolytic capacitor Cp1The positive and negative electrodes of the electrolytic capacitor C are connectedp1Respectively connected with the positive and negative poles of the DC output side of the double active bridge (a2), and the positive and negative poles of the DC input side of the double active bridge (a2) are respectively connected with the electrolytic capacitor Cp2The positive and negative electrodes of the electrolytic capacitor C are connectedp2The anode and the cathode of the solar photovoltaic panel (a3) are respectively connected with the anode and the cathode of the port voltage of the solar photovoltaic panel (a 3).
In a further embodiment, as shown in fig. 7, the dual active bridge (a2) includes 8 switching tubes Sp5～Sp12High frequency inductor Lp1Primary winding Lp2And a secondary winding Lp3；
The switch tube Sp5Source and switch tube Sp6Connection of drain, switching tube Sp7Source and switching tube Sp8Drain electrode connection, the high-frequency inductor Lp1One end of and a switch tube Sp5Source electrode connection, the high-frequency inductor Lp1The other end of (2) and the primary coil Lp2Is connected to the primary winding Lp2The other end of the switch tube Sp7Source electrode connection, switching tube Sp9Source and switching tube Sp10Drain electrode connection, switching tube Sp11Source and switching tube Sp12Drain electrode connected to the secondary winding Lp3One end of and a switch tube Sp9Source electrode connection, the secondary winding Lp3The other end of the switch tube Sp11Source electrode connection, switching tube Sp9Drain electrode of (1) and switching tube Sp11Is connected to the drain of the switching tube Sp10Source electrode of (1) and switching tube Sp12Is connected to the source of the switching tube Sp5Drain and switch tube Sp6The sources are respectively used as a double active bridge (a2), and the switch tube Sp11Drain and switch tube Sp12The sources are respectively used as the positive and negative poles of the direct current input side of the double active bridge (a 2).
In a further embodiment, as shown in fig. 8, the power compensation subunit comprises a dual active bridge (a5) and an electrolytic capacitor Cd1The positive electrode and the negative electrode of the direct current output side of the double active bridge (a5) are respectively connected with the electrolytic capacitor Cd1The positive and negative electrodes of the anode and the cathode are connected.
In a further embodiment, as shown in fig. 9, the battery energy storage subunit comprises an H-bridge (a6), an electrolytic capacitor Cb1A double active bridge (a7) and an electrolytic capacitor Cb2And a battery (a 8);
the anode and the cathode of the H bridge (a6) are respectively connected with the electrolytic capacitor Cb1The positive and negative electrodes of the electrolytic capacitor C are connectedb1Respectively connected with the positive and negative poles of the DC output side of the double active bridge (a7), and the positive and negative poles of the DC input side of the double active bridge (a7) are respectively connected with the electrolytic capacitor Cb2The positive and negative electrodes of the electrolytic capacitor C are connectedb2The positive and negative poles of (b) are connected to the positive and negative poles of the port voltage of the battery (a8), respectively.
In a further embodiment, the DAB output filter (a10) is a dual active bridge comprising a switch tube Si1～Si8High frequency inductor Li1Primary winding Li2And a secondary winding Li3；
The switch tube Si1Source electrode and switch tube Si2Is connected to the drain of the switching tube Si2Source electrode and switch tube Si4Is connected to the source of the switching tube Si4Drain electrode of and switch tube Si3Is connected to the source of the switching tube Si3Drain electrode of and switch tube Si1Is connected to the drain of the switching tube Si5Source electrode and switch tube Si6Is connected to the drain of the switching tube Si6Source electrode and switch tube Si8Is connected to the source of the switching tube Si8Drain electrode of and switch tube Si7Is connected to the source of the switching tube Si7Drain electrode of and switch tube Si5Is connected to the drain of the switching tube Si1Source and switch tube Si2Connection point of drain electrode and high-frequency inductor Li1Is connected to the high-frequency inductor Li1The other end of (2) and the primary coil Li2Is connected to the primary winding Li2Is connected with a switch tube S at the other endi3Source and switch tube Si4The connection point of the drain electrode is connected with the secondary coil Li3One end of and a switch tube Si5Source and switch tube Si6Drain electrodeIs connected to the connection point of the secondary winding Li3The other end of the switch tube Si7Source and switch tube Si8The connection point of the drain electrode is connected with the switching tube S of the switching tubei1Is connected with the positive electrode of a direct current bus (a9), and the switching tube Si2Is connected to the negative electrode of the dc bus (a 9).
In a further embodiment, the DAB output filter (a11) is a dual active bridge comprising a switch tube Sk1～Sk8High frequency inductor Lk1Primary winding Lk2And a secondary winding Lk3；
The switch tube Sk1Source electrode and switch tube Sk2Is connected to the drain of the switching tube Sk2Source electrode and switch tube Sk4Is connected to the source of the switching tube Sk4Drain electrode of and switch tube Sk3Is connected to the source of the switching tube Sk3Drain electrode of and switch tube Sk1Is connected to the drain of the switching tube Sk5Source electrode and switch tube Sk6Is connected to the drain of the switching tube Sk6Source electrode and switch tube Sk8Is connected to the source of the switching tube Sk8Drain electrode of and switch tube Sk7Is connected to the source of the switching tube Sk7Drain electrode of and switch tube Sk5Is connected to the drain of the switching tube Sk1Source and switch tube Sk2Connection point of drain electrode and high-frequency inductor Lk1Is connected to the high-frequency inductor Lk1The other end of (2) and the primary coil Lk2Is connected to the primary winding Lk2Is connected with a switch tube S at the other endk3Source and switch tube Sk4The connection point of the drain electrode is connected with the secondary coil Lk3One end of and a switch tube Sk5Source and switch tube Sk6The connection point of the drain electrode is connected with the secondary coil Lk3The other end of the switch tube Sk7Source and switch tube Sk8The connection point of the drain electrode is connected with the switching tube S of the switching tubek1Is connected with the positive electrode of a direct current bus (a9), and the switching tube Sk2Is connected to the negative electrode of the dc bus (a 9).
In a further embodiment, as shown in FIG. 11, the output DC/AC configuration (a12) includes n H-bridges, n-1 compensation switches, and n electrolytic capacitors C1～Cn；
The positive and negative poles of the n H bridges are respectively connected with the n electrolytic capacitors C1～CnIs connected with the positive and negative poles of N (N is belonged to [1, N ]]) The positive electrode of the electrolytic capacitor is connected with the negative electrode of the (N-1) th electrolytic capacitor through a compensation switch, and the N (N is the element of [1, N)]) One AC output terminal of the H-bridge is connected with the other output terminal of the (N-1) th H-bridge.
Preferably, as shown in fig. 10, the compensation switch is implemented as a bidirectional switch formed by two MOSFETs or IGBTs connected in series.
The working process of the invention specifically comprises the following steps:
as shown in fig. 6, the control method of the H-bridge a1 and H-bridge a6 switching tube of each hybrid power unit is as follows: an active power command value P to be outputted to a high voltage AC side a13grefWith the actual value of active power PgSubtracting the difference value, and sending the difference value to a power controller to obtain an output signal vdA reactive power command value Q to be outputted to the high voltage AC side a13grefAnd the actual value Q of the reactive powergSubtracting the difference value, and sending the difference value to a power controller to obtain an output signal vq，vd、vqAnd carrying out dq-ab coordinate transformation to obtain modulation wave signals of the H bridge a1 and the H bridge a6 of each hybrid power unit, and carrying out high-frequency modulation on the signals to obtain driving pulse signals of switching tubes of the H bridge a1 and the H bridge a 6. As shown in fig. 3, the control method of the switching tube of the battery energy storage subunit includes: an electrolytic capacitor Cp1Voltage v ofdc1And Cb1Voltage v ofdc2Average value command value V ofdcrefWith the actual value of the mean (V)dc1+Vdc2) A/2 difference is made, the difference being related to the battery port current iBAnd obtaining a modulation wave signal of the battery energy storage subunit through a voltage controller, and obtaining a driving pulse signal of a switching tube of the battery energy storage subunit after the signal is subjected to high-frequency modulation. As shown in fig. 2, the control method of the photovoltaic power generation electronic unit includes: obtaining charging power P of the battery according to the state of charge (SOC) of the battery and the charging curve of the batterychCharging the batteryElectric power PchAnd the actual power PBCalculating difference, and obtaining the optimal voltage increment delta v at two ends of the solar photovoltaic panel after the difference value passes through a proportional-integral controllermpptAccording to the terminal voltage v of the solar photovoltaic panelpvAnd an end current ipvAnd lockout logic LG3(ΔvmpptWhen the content is more than or equal to 0, LG3＝1，Δvmppt<At 0 time, LG3If LG is equal to 13If 0, MPPT is enabled, if LG3Maximum Power Point Tracking (MPPT) is forbidden if the Maximum Power Point Tracking (MPPT) is not set to 1) on the solar photovoltaic panel, and then the optimal voltage v at the two ends of the solar photovoltaic panel is obtainedmpptIncreasing the optimal voltage delta v at two ends of the solar photovoltaic panelmpptAnd an optimum voltage vmpptAdding the voltage values to obtain a terminal voltage instruction value v of the solar photovoltaic panelpvrefThe terminal voltage instruction value v of the solar photovoltaic panelpvrefAnd the actual value vpvCalculating the difference between the current and the current i at the solar photovoltaic panel endpvAnd obtaining a modulation wave signal of the photovoltaic power generation electronic unit after the voltage controller, and obtaining a driving pulse signal of a switching tube of the photovoltaic power generation electronic unit after the signal is subjected to high-frequency modulation. As shown in fig. 4, the control method of each compensation switch is as follows: an electrolytic capacitor Cp1And Cb1Voltage v ofdc1And vdc2And (4) obtaining a difference, sending the difference value to a voltage controller to obtain a modulation wave signal of each compensation switch, and obtaining a driving pulse signal of each compensation switch switching tube after the signal is subjected to high-frequency modulation. As shown in fig. 5, the control method of the power compensation subunit includes: the voltage command value V of the direct current bus a9O *With the actual value VOSending the difference into a voltage controller to obtain a modulation wave signal component v of the power compensation subunitr1The power command value P of the DC bus a9 is setO *And the actual value POSending the difference into a power controller to obtain a modulation wave signal component v of a power compensation subunitr2Compensating the power of the modulated wave signal component v of the subunitr1And vr2And after summing, carrying out high-frequency modulation to obtain a driving pulse signal of a switching tube of a compensation subunit of each hybrid power unit.
Examples
A miniature photovoltaic/energy storage smart power station topology comprising three phases a, b and c of identical structure, each phase containing N hybrid power cells (1,... N), a DC bus (a9), a DAB output filter (a10, a11) and an output DC/AC structure (a 12);
the N hybrid power units (1, 1., N) are connected in sequence through compensation switches, the direct current output end of each hybrid power unit (1, 1., N) is connected with a direct current bus (a9), the direct current bus is respectively connected with an input end of a DAB output filter a10, a DAB output filter (a11) and an output DC/AC structure (a12), the alternating current voltage output end of each phase of hybrid power unit (N) is connected with a high-voltage alternating current grid (a13), and the alternating current voltage neutral point output end of each phase of hybrid power unit (1) is connected with one point O.
Each hybrid power unit comprises a photovoltaic power generation subunit, a power compensation subunit, a battery energy storage subunit and a compensation switch (a 4).
The photovoltaic power generation subunit comprises an H bridge (a1) and an electrolytic capacitor Cp1A dual active bridge (a2) and a solar photovoltaic panel (a 3).
The H bridge (a1) comprises 4 switching tubes Sp1～Sp4The double active bridge (a2) comprises 8 switch tubes Sp5～Sp12High frequency inductor Lp1Primary winding Lp2Secondary winding Lp3And an electrolytic capacitor Cp2；
The switch tube Sp1Source electrode and switch tube Sp2The drain electrode connecting point of the switching tube S is an alternating voltage neutral point output end of an a, b and c three-phase each-phase hybrid power unitp2Source electrode and switch tube Sp4Is connected to the source of the switching tube Sp4Drain electrode of and switch tube Sp3Is connected to the source of the switching tube Sp3Drain electrode of and switch tube Sp1Is connected to the drain of the switching tube Sp3Drain electrode of and electrolytic capacitor Cp1Is connected to the positive pole of the switching tube Sp4Source electrode and electrolytic capacitor Cp1The negative electrode of the electrolytic capacitor Cp1Anode and switch tube Sp5And a switching tube Sp7Of the drain electrode ofCapacitor Cp1Negative electrode of (2) and switching tube Sp6And a switching tube Sp8Is connected to the source of the switching tube Sp5Source and switch tube Sp6Connection point of drain electrode and high-frequency inductor Lp1Is connected to the high-frequency inductor Lp1The other end of (2) and the primary coil Lp2Is connected to the primary winding Lp2The other end of the switch tube Sp7Source and switching tube Sp8The connection point of the drain electrode is connected with the secondary coil Lp3One end of and a switch tube Sp9Source and switching tube Sp10The connection point of the drain electrode is connected with the secondary coil Lp3The other end of the switch tube Sp11Source and switching tube Sp12The connection point of the drain electrode is connected with the electrolytic capacitor Cp2Anode and switch tube Sp9And a switching tube Sp11The drain electrode of the electrolytic capacitor Cp2Negative electrode of (2) and switching tube Sp10And a switching tube Sp12The electrolytic capacitor Cp2The anode of the electrolytic capacitor C is connected with the anode of the solar photovoltaic panelp2The negative electrode of the solar photovoltaic panel is connected with the negative electrode of the solar photovoltaic panel;
the power compensation subunit is a dual active bridge (a 5);
the double active bridge (a5) comprises 8 switching tubes Sd1～Sd8High frequency inductor Ld1Primary winding Ld2Secondary winding Ld3And an electrolytic capacitor Cd1；
The switch tube Sd1Drain electrode of and electrolytic capacitor Cp1Is connected to the positive pole of the switching tube Sd2Source electrode and electrolytic capacitor Cp1Is connected to the negative pole of the switching tube Sd1Source electrode and switch tube Sd2Is connected to the drain of the switching tube Sd2Source electrode and switch tube Sd4Is connected to the source of the switching tube Sd4Drain electrode of and switch tube Sd3Is connected to the source of the switching tube Sd3Drain electrode of and switch tube Sd1Is connected to the drain of the switching tube Sd5Source electrode and switch tube Sd6Is connected to the drain of the switching tube Sd6Source electrode and switch tube Sd8Is connected to the source of the switching tube Sd8Drain electrode of and switch tube Sd7Is connected to the source of the switching tube Sd7Drain electrode of and switch tube Sd5Is connected to the drain of the switching tube Sd1Source and switch tube Sd2Connection point of drain electrode and high-frequency inductor Ld1Is connected to the high-frequency inductor Ld1The other end of (2) and the primary coil Ld2Is connected to the primary winding Ld2Is connected with a switch tube S at the other endd3Source and switch tube Sd4The connection point of the drain electrode is connected with the secondary coil Ld3One end of and a switch tube Sd5Source and switch tube Sd6The connection point of the drain electrode is connected with the secondary coil Ld3The other end of the switch tube Sd7Source and switch tube Sd8The connection point of the drain electrode is connected with the electrolytic capacitor Cd1Respectively with the switching tube Sd5And a switching tube Sd7Is connected to the positive electrode of a DC bus (a9), and the electrolytic capacitor Cd1Negative electrode of (2) and switching tube Sd6And a switching tube Sd8Is connected to the negative electrode of the dc bus (a 9);
the battery energy storage subunit comprises an H bridge (a6) and an electrolytic capacitor Cb1A dual active bridge (a7) and a solar photovoltaic panel (a 8);
the H bridge (a6) comprises four switching tubes Sb1～Sb4The double active bridge (a7) comprises 8 switch tubes Sb5～Sb12High frequency inductor Lb1Primary winding Lb2Secondary winding Lb3And an electrolytic capacitor Cb2；
The switch tube Sb1Source electrode and switch tube Sb2Is connected to the drain of the switching tube Sb2Source electrode and switch tube Sb4Is connected to the source of the switching tube Sb4Drain electrode of and switch tube Sb3Is connected to the source of the switching tube Sb3Drain electrode of and switch tube Sb1Is connected to the drain of the switching tube Sb3Drain electrode of and electrolytic capacitor Cb1Is connected to the positive pole of the switching tube Sb4Source electrode of andelectrolytic capacitor Cb1The negative electrode of the electrolytic capacitor Cb1Anode and switch tube Sb5And a switching tube Sb7The drain electrode of the electrolytic capacitor Cb1Negative electrode of (2) and switching tube Sb6And a switching tube Sb8Is connected to the source of the switching tube Sb5Source and switch tube Sb6Connection point of drain electrode and high-frequency inductor Lb1Is connected to the high-frequency inductor Lb1The other end of (2) and the primary coil Lb2Is connected to the primary winding Lb2Is connected with a switch tube S at the other endb7Source and switching tube Sb8The connection point of the drain electrode is connected with the secondary coil Lb3One end of and a switch tube Sb9Source and switching tube Sb10The connection point of the drain electrode is connected with the secondary coil Lb3The other end of the switch tube Sb11Source and switching tube Sb12The connection point of the drain electrode is connected with the electrolytic capacitor Cb2Anode and switch tube Sb9And a switching tube Sb11The drain electrode of the electrolytic capacitor Cb2Negative electrode of (2) and switching tube Sb10And a switching tube Sb12The electrolytic capacitor Cb2The anode of the electrolytic capacitor C is connected with the anode of the solar photovoltaic panelb2The negative electrode of the switch tube S is connected with the negative electrode of the solar photovoltaic panelb1Source electrode of (1) and switching tube Sb2And a switching tube Sp3Source electrode of (1) and switching tube Sp4Is connected to the drain of the electrolytic capacitor Cp1Through the compensation switch (a4) and the electrolytic capacitor Cb1Is connected to the positive pole of the switching tube Sb3Source electrode and switch tube Sb4The drain electrode connecting point of the power unit is an alternating voltage output end of each phase of the a, b and c three-phase mixed power unit;
the compensation switch (a4) comprises a switch tube Sm1And Sm2；
The switch tube Sm1Source electrode of (1) and switching tube Sm2Is connected with the drain electrode of the transistor;
a switching tube S of the three-phase a, b and c hybrid power unit (1)p6Drain and switch tube Sp8The connection point of the source electrode is connected to the point O;
the switch tube Sp3Drain and switching tube Sp4Connecting point of source electrode and switch tube Sb3Drain and switching tube Sb4Connection point of source electrode, electrolytic capacitor Cp1Through the compensation switch (a4) and the electrolytic capacitor Cb1The positive electrode of (1) is connected;
n mixed power inter-unit switching tubes Sp1Source and switching tube Sp2The connection point of the drain electrode and the switch tube Sb3Source and switching tube Sb4The connection point of the drain electrode is connected, and the electrolytic capacitors C among the N mixed power unitsp1The anode of the capacitor is connected with the electrolytic capacitor C through the compensation switchb2Is connected to the positive electrode.
The DAB output filter (a10) is a double active bridge comprising a switch tube Si1～Si8High frequency inductor Li1Primary winding Li2Secondary winding Li3And an electrolytic capacitor Ci1；
The switch tube Si1Source electrode and switch tube Si2Is connected to the drain of the switching tube Si2Source electrode and switch tube Si4Is connected to the source of the switching tube Si4Drain electrode of and switch tube Si3Is connected to the source of the switching tube Si3Drain electrode of and switch tube Si1Is connected to the drain of the switching tube Si5Source electrode and switch tube Si6Is connected to the drain of the switching tube Si6Source electrode and switch tube Si8Is connected to the source of the switching tube Si8Drain electrode of and switch tube Si7Is connected to the source of the switching tube Si7Drain electrode of and switch tube Si5Is connected to the drain of the switching tube Si1Source and switch tube Si2Connection point of drain electrode and high-frequency inductor Li1Is connected to the high-frequency inductor Li1The other end of (2) and the primary coil Li2Is connected to the primary winding Li2Is connected with a switch tube S at the other endi3Source and switch tube Si4The connection point of the drain electrode is connected with the secondary coil Li3And a switchPipe Si5Source and switch tube Si6The connection point of the drain electrode is connected with the secondary coil Li3The other end of the switch tube Si7Source and switch tube Si8The connection point of the drain electrode is connected with the switching tube S of the switching tubei1Is connected with the positive electrode of a direct current bus (a9), and the switching tube Si2Is connected to the negative electrode of the dc bus (a 9);
the DAB output filter (a10) is a double active bridge comprising a switch tube Sk1～Sk8High frequency inductor Lk1Primary winding Lk2Secondary winding Lk3And an electrolytic capacitor Ck1；
The switch tube Sk1Source electrode and switch tube Sk2Is connected to the drain of the switching tube Sk2Source electrode and switch tube Sk4Is connected to the source of the switching tube Sk4Drain electrode of and switch tube Sk3Is connected to the source of the switching tube Sk3Drain electrode of and switch tube Sk1Is connected to the drain of the switching tube Sk5Source electrode and switch tube Sk6Is connected to the drain of the switching tube Sk6Source electrode and switch tube Sk8Is connected to the source of the switching tube Sk8Drain electrode of and switch tube Sk7Is connected to the source of the switching tube Sk7Drain electrode of and switch tube Sk5Is connected to the drain of the switching tube Sk1Source and switch tube Sk2Connection point of drain electrode and high-frequency inductor Lk1Is connected to the high-frequency inductor Lk1The other end of (2) and the primary coil Lk2Is connected to the primary winding Lk2Is connected with a switch tube S at the other endk3Source and switch tube Sk4The connection point of the drain electrode is connected with the secondary coil Lk3One end of and a switch tube Sk5Source and switch tube Sk6The connection point of the drain electrode is connected with the secondary coil Lk3The other end of the switch tube Sk7Source and switch tube Sk8The connection point of the drain electrode is connected with the switching tube S of the switching tubek1Is connected with the positive electrode of a direct current bus (a9), and the switching tube Sk2OfThe pole is connected with the negative pole of the direct current bus (a 9);
the output DC/AC structure (a12) comprises n (n ═ 1, 2., + ∞) H bridges and n-1 compensation switches, the nth H bridge comprising four switching tubes S4n-3～S4nSaid switch tube S1Source electrode and switch tube S2Is connected to the drain of the switching tube S2Source electrode and switch tube S4Is connected to the source of the switching tube S4Drain electrode of and switch tube S3Is connected to the source of the switching tube S3Drain electrode of and switch tube S1Is connected to the drain of the switching tube S4n-3Source electrode and switch tube S4n-2Is connected to the drain of the switching tube S4n-2Source electrode and switch tube S4nIs connected to the source of the switching tube S4nDrain switch tube S4n-1Is connected to the source of the switching tube S4n-1Drain electrode of and switch tube S4n-3Is connected to the drain of the switching tube S1Drain electrode of and electrolytic capacitor C1Is connected to the positive pole of the switching tube S2Source electrode and electrolytic capacitor C2Is connected to the negative pole of the switching tube S4n-3Drain electrode of and electrolytic capacitor CnIs connected to the positive pole of the switching tube S4n-2Source electrode and electrolytic capacitor CnThe negative electrode of the electrolytic capacitor C1Is connected to the positive electrode of a DC bus (a9), and the electrolytic capacitor CnIs connected to the negative electrode of the DC bus (a9), and the nth electrolytic capacitor CnThe positive pole of the capacitor is connected with the (n-1) th electrolytic capacitor C through a compensation switchn-1Is connected to the negative pole of the switching tube S4nDrain electrode and S4n-1The connection point of the source electrode passes through the compensation switch and the switch tube S4n-6Drain electrode and S4n-7The connection point of the source is connected.

Claims (8)

1. The topological structure of the miniature photovoltaic/energy storage intelligent power station is characterized by comprising three phases a, b and c with the same structure, wherein each phase comprises N mixed power units, a direct current bus a9, double active bridge output filters a10 and a11, an output DC/AC structure a12 and a high voltage alternating current side a 13;
the N hybrid power units are sequentially connected through compensation switches, a direct-current output end of each hybrid power unit is connected with a direct-current bus a9, the direct-current bus is respectively connected with a double-active-bridge output filter a10, a double-active-bridge output filter a11 and an input end of an output DC/AC structure a12, an alternating-current voltage output end of each phase of hybrid power unit is connected with a high-voltage alternating-current side a13, and an alternating-current voltage neutral point output end of each phase of hybrid power unit is connected with one point O;
each hybrid power unit comprises a photovoltaic power generation subunit, a power compensation subunit, a battery energy storage subunit and a compensation switch a 4;
the positive electrode and the negative electrode of the direct current output side of the photovoltaic power generation electronic unit are respectively connected with the positive electrode and the negative electrode of the direct current input side of the power compensation subunit, the positive electrode of the direct current output side of the photovoltaic power generation electronic unit is connected with the positive electrode of the direct current output side of the battery energy storage subunit through a compensation switch a4, and one end of the alternating current output side of the photovoltaic power generation electronic unit is connected with one end of the alternating current output side of the battery energy storage subunit;
the photovoltaic power generation subunit comprises an H bridge a1 and an electrolytic capacitor Cp1A double active bridge a2, an electrolytic capacitor Cp2And a solar photovoltaic panel a 3;
the anode and the cathode of the H bridge a1 are respectively connected with the electrolytic capacitor Cp1The positive and negative electrodes of the electrolytic capacitor C are connectedp1Respectively connected with the positive and negative poles of the DC output side of the double active bridge a2, and the positive and negative poles of the DC input side of the double active bridge a2 are respectively connected with the electrolytic capacitor Cp2The positive and negative electrodes of the electrolytic capacitor C are connectedp2The anode and the cathode of the solar photovoltaic panel a3 are respectively connected with the anode and the cathode of the port voltage of the solar photovoltaic panel a 3.
2. The miniature photovoltaic/energy storage intelligent power station topology of claim 1, wherein: the double active bridge a2 comprises 8 switching tubes Sp5～Sp12High frequency inductor Lp1Primary winding Lp2And a secondary winding Lp3；
The switch tube Sp5Source and switch tube Sp6Connection of drain electrode, switching tubeSp7Source and switch tube Sp8Drain electrode connection, the high-frequency inductor Lp1One end of and a switch tube Sp5Source electrode connection, the high-frequency inductor Lp1The other end of (2) and the primary coil Lp2Is connected to the primary winding Lp2The other end of the switch tube Sp7Source electrode connection, switching tube Sp9Source and switching tube Sp10Drain electrode connection, switching tube Sp11Source and switching tube Sp12Drain electrode connected to the secondary winding Lp3One end of and a switch tube Sp9Source electrode connection, the secondary winding Lp3The other end of the switch tube Sp11Source electrode connection, switching tube Sp9Drain electrode of (1) and switching tube Sp11Is connected to the drain of the switching tube Sp10Source electrode of (1) and switching tube Sp12Is connected to the source of the switching tube Sp5Drain and switch tube Sp6The sources of the two active bridges a2, the switch tube Sp11Drain and switch tube Sp12The sources are respectively the positive and negative poles of the direct current input side of the double active bridge a 2.
3. The miniature photovoltaic/energy-storage smart power station topology of claim 1, wherein said power compensation subunit comprises a dual active bridge a5 and an electrolytic capacitor Cd1The positive electrode and the negative electrode of the direct current output side of the double-active bridge a5 are respectively connected with the electrolytic capacitor Cd1The positive and negative electrodes of the anode and the cathode are connected.
4. The miniature photovoltaic/energy-storage smart power station topology of claim 1, wherein said battery energy storage sub-unit comprises an H-bridge a6, an electrolytic capacitor Cb1A double active bridge a7, an electrolytic capacitor Cb2And a battery a 8;
the anode and the cathode of the H bridge a6 are respectively connected with the electrolytic capacitor Cb1The positive and negative electrodes of the electrolytic capacitor C are connectedb1The anode and the cathode of the capacitor are respectively connected with the anode and the cathode of the direct current output side of the double active bridge a7, and the anode and the cathode of the direct current input side of the double active bridge a7 are respectively connected with the electrolytic capacitor Cb2The positive and negative electrodes of the electrolytic capacitor C are connectedb2Positive and negative electrodes ofRespectively connected with the positive electrode and the negative electrode of the port voltage of the battery a 8.
5. The miniature photovoltaic/energy storage intelligent power station topology structure of claim 1, wherein the dual-active-bridge output filter a10 is a dual-active bridge comprising a switch tube Si1～Si8High frequency inductor Li1Primary winding Li2And a secondary winding Li3；
The switch tube Si1Source electrode and switch tube Si2Is connected to the drain of the switching tube Si2Source electrode and switch tube Si4Is connected to the source of the switching tube Si4Drain electrode of and switch tube Si3Is connected to the source of the switching tube Si3Drain electrode of and switch tube Si1Is connected to the drain of the switching tube Si5Source electrode and switch tube Si6Is connected to the drain of the switching tube Si6Source electrode and switch tube Si8Is connected to the source of the switching tube Si8Drain electrode of and switch tube Si7Is connected to the source of the switching tube Si7Drain electrode of and switch tube Si5Is connected to the drain of the switching tube Si1Source and switch tube Si2Connection point of drain electrode and high-frequency inductor Li1Is connected to the high-frequency inductor Li1The other end of (2) and the primary coil Li2Is connected to the primary winding Li2Is connected with a switch tube S at the other endi3Source and switch tube Si4The connection point of the drain electrode is connected with the secondary coil Li3One end of and a switch tube Si5Source and switch tube Si6The connection point of the drain electrode is connected with the secondary coil Li3The other end of the switch tube Si7Source and switch tube Si8The connection point of the drain electrode is connected with the switch tube Si1Is connected with the positive pole of a direct current bus a9, and the switch tube Si2Is connected to the negative electrode of dc bus a 9.
6. The miniature photovoltaic/energy storage smart power station topology of claim 1, wherein said power station topology is characterized byThe double-active-bridge output filter a11 is a double-active bridge comprising a switch tube Sk1～Sk8High frequency inductor Lk1Primary winding Lk2And a secondary winding Lk3；
The switch tube Sk1Source electrode and switch tube Sk2Is connected to the drain of the switching tube Sk2Source electrode and switch tube Sk4Is connected to the source of the switching tube Sk4Drain electrode of and switch tube Sk3Is connected to the source of the switching tube Sk3Drain electrode of and switch tube Sk1Is connected to the drain of the switching tube Sk5Source electrode and switch tube Sk6Is connected to the drain of the switching tube Sk6Source electrode and switch tube Sk8Is connected to the source of the switching tube Sk8Drain electrode of and switch tube Sk7Is connected to the source of the switching tube Sk7Drain electrode of and switch tube Sk5Is connected to the drain of the switching tube Sk1Source and switch tube Sk2Connection point of drain electrode and high-frequency inductor Lk1Is connected to the high-frequency inductor Lk1The other end of (2) and the primary coil Lk2Is connected to the primary winding Lk2Is connected with a switch tube S at the other endk3Source and switch tube Sk4The connection point of the drain electrode is connected with the secondary coil Lk3One end of and a switch tube Sk5Source and switch tube Sk6The connection point of the drain electrode is connected with the secondary coil Lk3The other end of the switch tube Sk7Source and switch tube Sk8The connection point of the drain electrode is connected with the switch tube Sk1Is connected with the positive pole of a direct current bus a9, and the switch tube Sk2Is connected to the negative electrode of dc bus a 9.
7. The miniature photovoltaic/energy storage smart power station topology of claim 1, wherein said output DC/AC structure a12 comprises n H-bridges, n-1 compensation switches and n electrolytic capacitors C1～Cn；
The positive and negative poles of the n H bridges are respectively connected with the n electrolytic capacitors C1～CnPositive and negative electrodes ofThe positive pole of the Nth electrolytic capacitor is connected with the negative pole of the (N-1) th electrolytic capacitor through a compensation switch, and one alternating current output end of the Nth H bridge is connected with the other output end of the (N-1) th H bridge; wherein N is equal to [2, N ]]。
8. The miniature photovoltaic/energy storage smart power station topology of claim 7, wherein said compensation switch is implemented as a bi-directional switch formed by two MOSFETs or IGBTs connected in series.
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