CN110336320B - New energy grid-connected or on-site consumption system based on electric energy router - Google Patents
New energy grid-connected or on-site consumption system based on electric energy router Download PDFInfo
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- CN110336320B CN110336320B CN201910619085.4A CN201910619085A CN110336320B CN 110336320 B CN110336320 B CN 110336320B CN 201910619085 A CN201910619085 A CN 201910619085A CN 110336320 B CN110336320 B CN 110336320B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—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
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Abstract
The invention discloses a new energy grid-connected or on-site consumption system based on an electric energy router. The system comprises: the system comprises an alternating current power grid, an electric energy router and a plurality of electric power equipment; the electric energy router comprises an inductor, a cascade H-bridge bidirectional converter and a plurality of resonant isolated bidirectional DC/DC converters; the alternating current sides of a plurality of H-bridge topologies of the cascaded H-bridge bidirectional converter are cascaded and are connected to an alternating current power grid through an inductor; the plurality of H-bridge topologies are connected with the plurality of resonant type isolation bidirectional DC/DC converters in a one-to-one correspondence manner, and the direct current side of the H-bridge topology is connected with the primary side direct current side of the resonant type isolation bidirectional DC/DC converter; a secondary side direct current side of the resonant isolation bidirectional DC/DC converter forms a direct current bus, and power equipment is connected to the direct current bus; the power equipment comprises new energy equipment, energy storage battery equipment and load equipment. The invention has the advantages of high efficiency, high reliability, wide gain, bidirectional energy transmission, dynamic power quality adjustment and the like.
Description
Technical Field
The invention relates to the field of electric automation equipment, in particular to a new energy grid-connected or on-site consumption system based on an electric energy router.
Background
With the gradual decrease of fossil energy, renewable energy sources such as wind power generation and photovoltaic power generation will be applied in large quantities in the future. In order to meet the challenges brought to safe and stable operation of a power grid by wind power, photovoltaic and the like, a high-capacity battery energy storage system is also needed to stabilize power fluctuation, peak regulation and frequency modulation of new energy and improve the quality of electric energy.
Firstly, as the new energy power generation has the characteristics of high uncertainty, high uncontrollable performance, wide distribution, remote places, severe operation environment, low equipment reliability, large operation and maintenance workload and the like, with the increase of the number of new energy in the future, the scheme adopted by the current monitoring and operation and maintenance of the new energy needs to have the conditions for communicating and scheduling with all new energy or a field central controller no matter information is uploaded through a monitoring system or a special grid-connected interface device. The control difficulty of a superior power grid on new energy is increased, and meanwhile, the real-time performance and the reliability of scheduling are also seriously influenced by the limitations of technologies such as bandwidth, communication data compression and the like.
Secondly, distributed voltage capacity is little, but voltage or frequency volatility are great, have alternating current-direct current concurrently, can't direct access electric power system, therefore different new forms of energy power generation system access distribution network need different types of electric energy conversion equipment, for example: the photovoltaic power generation conversion circuit may adopt a direct DC/AC topology or a DC/DC-DC/AC two-stage topology, and the wind power generation conversion circuit generally adopts an AC/DC-DC/AC two-stage topology. Since these conversion devices are often designed specifically according to different application scenarios, the following problems may arise: (1) external interfaces are not unified and standard, and equipment manufacturers define the interface form of the product by themselves, so that the variety is various, the engineering application is complex, and the subsequent maintenance is difficult; (2) the difference of the alternating voltage connected to the primary side of the boosting transformer of the power grid is large, and a unified standard does not exist; (3) in actual engineering, the electric energy conversion device cannot cover all power sections, and the power mismatching phenomenon of engineering model selection can possibly influence the electric energy quality of the power distribution network.
Disclosure of Invention
The invention aims to provide a new energy grid-connected or on-site consumption system based on an electric energy router, and aims to solve the problems of high topological cost and low efficiency of the new energy grid-connected or on-site consumption system in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
a new energy grid-connected or on-site consumption system based on an electric energy router comprises: the system comprises an alternating current power grid, an electric energy router and a plurality of electric power equipment;
the electric energy router comprises a first inductor, a cascade H-bridge bidirectional converter and a plurality of resonant isolated bidirectional DC/DC converters;
the cascade H-bridge bidirectional converter comprises a plurality of H-bridge topologies, and alternating current sides of the H-bridge topologies are cascaded and connected to the alternating current power grid through the first inductor; the plurality of H-bridge topologies are connected with the plurality of resonant type isolation bidirectional DC/DC converters in a one-to-one correspondence manner, and the direct current side of the H-bridge topology is connected with the primary side direct current side of the resonant type isolation bidirectional DC/DC converter;
a secondary side direct current side of the resonant isolated bidirectional DC/DC converter forms a direct current bus, and the power equipment is connected to the direct current bus; the power equipment comprises new energy equipment, energy storage battery equipment and load equipment.
Optionally, the power router further includes a plurality of power conversion topology modules; the power equipment is connected to the direct current bus through the electric energy conversion topology module.
Optionally, the plurality of electric energy conversion topology modules are respectively a new energy access electric energy conversion topology module, an energy storage battery access electric energy conversion topology module, an alternating current load access electric energy conversion topology module and a direct current load access electric energy conversion topology module;
the new energy equipment is connected to the direct current bus through the new energy access electric energy conversion topology module;
the energy storage battery access electric energy conversion topological module is a two-quadrant DC/DC conversion circuit, and the energy storage battery equipment is connected to the direct current bus through the two-quadrant DC/DC conversion circuit;
the alternating current load access electric energy conversion topology module is a DC/AC inverter, and alternating current load equipment in the load equipment is connected to the direct current bus through the DC/AC inverter;
the direct current load access electric energy conversion topology module is a DC/DC converter, and direct current load equipment in the load equipment is connected to the direct current bus through the DC/DC converter.
Optionally, the new energy access electric energy conversion topology module includes a wind power generation access electric energy conversion topology submodule and a photovoltaic power generation access electric energy conversion topology submodule;
the wind power generation access electric energy conversion topological submodule is a three-phase bridge type full-control rectifying circuit, and wind power generation equipment in the new energy equipment is connected to the direct-current bus through the three-phase bridge type full-control rectifying circuit;
the photovoltaic power generation access electric energy conversion topological submodule is a Boost DC/DC converter, and photovoltaic power generation equipment in the new energy equipment is connected to the direct current bus through the Boost DC/DC converter.
Optionally, the two-quadrant DC/DC conversion circuit specifically includes: the first full-control type switch device, the second full-control type switch device and the second inductor;
the first end of the second inductor is connected with the energy storage battery, and the emitter of the first fully-controlled switching device and the collector of the second fully-controlled switching device are both connected with the second end of the second inductor; and the collector of the first fully-controlled switching device and the emitter of the second fully-controlled switching device are respectively connected with the positive end and the negative end of the direct-current bus.
Optionally, the DC/DC converter is a Buck DC/DC converter, a Boost DC/DC converter, a Cuk DC/DC converter, or a two-quadrant DC/DC converter.
Optionally, the cascaded H-bridge bidirectional converter specifically includes: a plurality of H-bridge topologies and a plurality of capacitors;
the alternating current side of a plurality of H-bridge topologies is cascaded to form a multi-level output;
the plurality of H-bridge topologies correspond to the plurality of direct current side capacitors one by one, and the direct current sides of the H-bridge topologies are connected with the capacitors in parallel and used for filtering alternating current components.
Optionally, the resonant isolated bidirectional DC/DC converter specifically includes: the high-frequency transformer comprises a first H-bridge bidirectional converter, a first resonant element, a high-frequency transformer, a second resonant element and a second H-bridge bidirectional converter;
the direct current side of the first H-bridge bidirectional converter is connected with the direct current side of the H-bridge topology, the alternating current side of the first H-bridge bidirectional converter is connected with the first end of the first resonance element, the second end of the first resonance element is connected with the primary side of the high-frequency transformer, the secondary side of the high-frequency transformer is connected with the first end of the second resonance element, the second end of the second resonance element is connected with the alternating current side of the second H-bridge bidirectional converter, and the direct current side of the second H-bridge bidirectional converter forms the direct current bus.
Optionally, the first resonant element includes a first resonant inductor, a first resonant capacitor, and a third resonant inductor; the first resonant inductor and the first resonant capacitor are connected in series between the alternating current side of the first H-bridge bidirectional converter and the primary side of the high-frequency transformer; the third resonant inductor is connected in parallel to the primary side of the high-frequency transformer;
the second resonant element comprises a second resonant capacitor and a second resonant inductor; the second resonant capacitor and the second resonant inductor are connected in series between the secondary side of the high-frequency transformer and the alternating current side of the second H-bridge bidirectional converter.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the electric energy router is applied to a new energy grid-connected or on-site consumption system, the defects of high cost and large volume of a traditional grid-connected inverter power frequency transformer are overcome, and the quality of electric energy in a grid-connected mode can be ensured without additional voltage regulation and frequency modulation equipment; on the other hand, the power energy router comprises a direct current link, so that the input and output voltages can be flexibly controlled, and the local consumption of the distributed power supply is facilitated.
The cascade H-bridge bidirectional converter has the advantages of easy modularization, high reliability, low harmonic wave and the like, and can realize electric energy conversion with high power and high voltage level.
The resonant isolation bidirectional DC/DC converter can work in a boosting mode and a reducing mode, can effectively eliminate circulating energy, reduces turn-off loss, enlarges the soft switching range and further improves the efficiency of the converter.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a new energy grid-connected or on-site consumption system based on an electric energy router according to the present invention;
FIG. 2 is a schematic diagram of a cascaded H-bridge bidirectional converter according to the present invention;
FIG. 3 is a schematic diagram of a resonant isolated bidirectional DC/DC converter according to the present invention;
FIG. 4 is a schematic structural diagram of a wind power generation access electric energy conversion topology submodule according to the present invention;
FIG. 5 is a schematic structural diagram of a photovoltaic power generation access electric energy conversion topology sub-module according to the present invention;
fig. 6 is a schematic structural diagram of an energy storage battery accessing to an electric energy conversion topology module according to the present invention;
FIG. 7 is a schematic structural diagram of a DC load access power conversion topology module according to the present invention;
fig. 8 is a schematic structural diagram of an ac load access power conversion topology module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a new energy grid-connected or on-site consumption system based on an electric energy router. As shown in fig. 1, the new energy grid-connected or on-site consumption system based on the electric energy router comprises the following structures: an alternating current power grid, an electrical energy router and a plurality of electrical devices. The power equipment comprises new energy equipment, energy storage battery equipment and load equipment, the new energy equipment comprises wind power generation equipment and photovoltaic power generation equipment, and the load equipment comprises direct current load equipment and alternating current load equipment.
The electric energy router comprises a first inductor LsThe system comprises a cascade H-bridge bidirectional converter and a plurality of resonant isolated bidirectional DC/DC converters. The first inductor LsOne end of the cascade H-bridge bidirectional converter is connected with an alternating current power grid, and the other end of the cascade H-bridge bidirectional converter is connected with an alternating current side of the cascade H-bridge bidirectional converter and used for filtering high-frequency components. And a plurality of H-bridge topologies of the cascaded H-bridge bidirectional converter are connected with a plurality of resonant type isolation bidirectional DC/DC converters in a one-to-one correspondence manner, and the direct current side of the H-bridge topology is connected with the primary side direct current side of the resonant type isolation bidirectional DC/DC converter. The secondary side direct current side of the resonant isolated bidirectional DC/DC converterForming a direct current bus to which the power device is connected. The alternating current power grid, the new energy device, the energy storage battery device and the alternating current/direct current load device can be directly connected with the electric energy router, wherein the alternating current power grid and the energy storage battery device can be used as input sources of electric energy in the electric energy router and can also be used as output sources of the electric energy; the new energy equipment is generally used as an input source of a power supply; ac and dc load devices are generally used as an output source of electrical energy.
The electric energy router of this embodiment further includes a plurality of electric energy conversion topology modules, and the power device is connected to the dc bus through the electric energy conversion topology modules. According to different types of power equipment, the types of the power conversion topology modules are different. Corresponding to the type of the power equipment, the plurality of electric energy conversion topology modules are respectively a new energy access electric energy conversion topology module, an energy storage battery access electric energy conversion topology module, an alternating current load access electric energy conversion topology module and a direct current load access electric energy conversion topology module.
The direct current output end of the new energy access electric energy conversion topology module is connected with a direct current bus, the input end of the new energy access electric energy conversion topology module is connected with new energy equipment, and the new energy access electric energy conversion topology module can convert electric energy generated by the new energy equipment into direct current with the same voltage grade as the direct current bus; the energy storage battery access electric energy conversion topological module can convert electric energy emitted by the energy storage battery equipment into direct current with the same voltage grade as the direct current bus and also can convert the direct current with the same voltage grade as the direct current bus into electric energy required by charging the energy storage battery equipment; the AC load access electric energy conversion topology module is connected with a DC input end of the AC load access electric energy conversion topology module and a DC bus, an AC output end of the AC load access electric energy conversion topology module is connected with AC load equipment in the load equipment, and the AC load access electric energy conversion topology module can convert DC with the same voltage level as the DC bus into AC power required by the AC load; the direct current load access electric energy conversion topology module is connected with a direct current input end of the direct current load access electric energy conversion topology module and a direct current bus, a direct current output end of the direct current load access electric energy conversion topology module is connected with direct current load equipment in the load equipment, and the direct current load access electric energy conversion topology module can convert direct current with the same voltage level as the direct current bus into direct current required by the direct current load.
In the embodiment, the cascade H-bridge bidirectional converter is connected with an alternating current power grid, so that high-voltage high-power rectification or inversion can be realized; the resonant isolation bidirectional DC/DC converter is respectively connected with each H-bridge topology in the cascade H-bridge bidirectional converter, can realize ZVS soft switching of a primary side switching tube in the full range, and can realize ZCS soft switching, electrical isolation and voltage conversion of a secondary side diode in the range of under-resonance and resonance points. And the direct current bus is connected with the electric energy conversion topology module. After the new energy equipment, the energy storage battery equipment and the load equipment are connected, various distributed electric energy with different frequencies and different voltage levels can be converted into power frequency alternating current to be incorporated into a power grid, or the voltage-adjustable direct current directly supplies power to a local load, and the high-capacity energy storage battery can stabilize the power fluctuation and peak and frequency modulation of the new energy and improve the electric energy quality so as to achieve efficient and reliable utilization of the new energy. The invention has the advantages of high efficiency, wide gain, bidirectional energy transmission, dynamic power quality adjustment and the like.
As another embodiment, fig. 2 is a schematic structural diagram of a cascaded H-bridge bidirectional converter according to the present invention, and as shown in fig. 2, the cascaded H-bridge bidirectional converter specifically includes: multiple H-bridge topologies and multiple capacitors Ci(i ═ 1,2, …, n), the ac side of multiple H-bridge topologies being cascaded in sequence for forming multi-level outputs; the plurality of H-bridge topologies correspond to the plurality of direct current side capacitors one by one, and the direct current sides of the H-bridge topologies are connected with the capacitors in parallel and used for filtering alternating current components.
As another embodiment, fig. 3 is a schematic structural diagram of a resonant isolated bidirectional DC/DC converter according to the present invention, and as shown in fig. 3, the resonant isolated bidirectional DC/DC converter specifically includes: the high-frequency transformer comprises a first H-bridge bidirectional converter, a first resonant element, a high-frequency transformer, a second resonant element and a second H-bridge bidirectional converter; the direct current side of the first H-bridge bidirectional converter is connected with the direct current side of the H-bridge topology, the alternating current side of the first H-bridge bidirectional converter is connected with the first end of the first resonance element, the second end of the first resonance element is connected with the primary side of the high-frequency transformer, the secondary side of the high-frequency transformer is connected with the first end of the second resonance element, the second end of the second resonance element is connected with the alternating current side of the second H-bridge bidirectional converter, and the direct current side of the second H-bridge bidirectional converter forms the direct current bus.
The first resonant element comprises a first resonant inductance Lr1A first resonant capacitor Cr1And a third resonant inductor LmSaid second resonant element comprising a second resonant capacitor Cr2And a second resonant inductor Lr2；
The first resonant inductor Lr1And a first resonant capacitor Cr1The first H-bridge bidirectional converter is connected in series with the primary side of the high-frequency transformer and is connected with the alternating current side of the first H-bridge bidirectional converter; third resonant inductor LmIs connected with a high-frequency transformer in parallel; second resonant inductor Lr2And a second resonant capacitor Cr2The secondary side of the high-frequency transformer is connected in series and is connected with the alternating current side of the second H-bridge bidirectional converter; the direct current sides of the second H-bridge bidirectional converters are connected in parallel to form a direct current bus; the direct current side capacitor C is connected with the direct current bus in parallel and can filter alternating current components.
First resonant inductor Lr1And a first resonant capacitor Cr1Can form a first resonant frequency and a second resonant inductor Lr2And a second resonant capacitor Cr2A second resonant frequency, a third resonant inductance LmCan be connected with the first resonant inductor Lr1A first resonant capacitor Cr1Forming a third resonant frequency, a third resonant inductance LmCan be connected with a second resonant inductor Lr2A second resonant capacitor Cr2Forming a fourth resonant frequency. The high-frequency transformer has a transformation ratio of N:1, comprises a winding, an iron core and an insulation/heat dissipation structure, and is used for realizing electrical isolation and voltage grade transformation.
The new energy equipment comprises wind power generation equipment and photovoltaic power generation equipment, and the corresponding new energy access electric energy conversion topology module comprises a wind power generation access electric energy conversion topology submodule and a photovoltaic power generation access electric energy conversion topology submodule. Wind power generation equipment in the new energy equipment is connected to the direct current bus through the wind power generation access electric energy conversion topology submodule, and photovoltaic power generation equipment in the new energy equipment is connected to the direct current bus through the photovoltaic power generation access electric energy conversion topology submodule.
As another embodiment, fig. 4 is a schematic structural diagram of a topology submodule for connecting wind power generation to electric energy conversion according to the present invention, and as shown in fig. 4, the topology submodule for connecting wind power generation to electric energy conversion is a three-phase bridge type fully-controlled rectification circuit, and the three-phase bridge type fully-controlled rectification circuit includes a three-phase H-bridge topology and a first filter inductor Lf1A second filter inductor Lf2A third filter inductor Lf3(ii) a The first ends of the three filter inductors are connected with the wind power generation equipment, the second ends of the three filter inductors are respectively connected with the three-phase H-bridge topology alternating current side, and the three-phase H-bridge topology direct current side is connected with the direct current bus.
As another embodiment, fig. 5 is a schematic structural diagram of a photovoltaic power generation access electric energy conversion topology submodule according to the present invention, and as shown in fig. 5, the photovoltaic power generation access electric energy conversion topology submodule is a Boost DC/DC converter, and includes a fully-controlled switching device S, a freewheeling diode D, and an inductor L; one end of the inductor L is connected with the photovoltaic power generation equipment, and the other end of the inductor L is connected with the collector electrode of the fully-controlled switching device S; the emitter of the full-control type switching device S is respectively connected with the negative terminals of the photovoltaic power generation and the direct-current bus; and the anode of the fly-wheel diode D is connected with the collector of the full-control type switching device S, and the cathode of the fly-wheel diode D is connected with the positive end of the direct-current bus.
As another embodiment, fig. 6 is a schematic structural diagram of an energy storage battery accessing power conversion topology module according to the present invention, and as shown in fig. 6, the energy storage battery accessing power conversion topology module is a two-quadrant DC/DC conversion circuit, and the two-quadrant DC/DC conversion circuit includes a first fully-controlled switching device SaA second full-control type switch device SbAnd an inductance L; one end of the inductor L is connected with the energy storage battery equipment, and the other end of the inductor L is connected with the first full-control type switching device SaEmitter and second full-control type switching device SbThe collector electrodes are connected; first full-control type switching device SaCollector and second full-control type switch device SbThe emitter electrodes are respectively connected withThe positive end and the negative end of the direct current bus are connected. Wherein a first full-control type switching device S is controlledaThe on-off of the energy storage battery can realize that the direct current bus charges the energy storage battery equipment; controlling a second fully-controlled switching device SbThe on-off of the energy storage battery device can realize the discharge of the energy storage battery device to the direct current bus.
As another embodiment, fig. 7 is a schematic structural diagram of a DC load access power conversion topology module according to the present invention, and as shown in fig. 7, the DC load access power conversion topology module is a DC/DC converter, a DC input end of the DC/DC converter is connected to a DC bus, and a DC output end of the DC/DC converter is connected to a DC load. The DC/DC converter may be a Buck DC/DC converter shown in part (a), a Boost DC/DC converter shown in part (b), a Cuk DC/DC converter shown in part (c), or a two-quadrant DC/DC converter shown in part (d).
As another embodiment, fig. 8 is a schematic structural diagram of an AC load access power conversion topology module according to the present invention, and as shown in fig. 8, the AC load access power conversion topology module is a DC/AC inverter, a DC input end of the DC/AC inverter is connected to a DC bus, and an AC output end of the DC/AC inverter is connected to an AC load, where the DC/AC inverter may adopt a three-level T-type inverter shown in part (a), a single-phase full-bridge inverter shown in part (b), a three-level flying capacitor-type inverter shown in part (c), or a three-level midpoint clamp-type inverter shown in part (d).
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. A new energy grid-connected or on-site consumption system based on an electric energy router is characterized by comprising: the system comprises an alternating current power grid, an electric energy router and a plurality of electric power equipment;
the electric energy router comprises a first inductor, a cascade H-bridge bidirectional converter and a plurality of resonant isolated bidirectional DC/DC converters;
the cascade H-bridge bidirectional converter comprises a plurality of H-bridge topologies, and alternating current sides of the H-bridge topologies are cascaded and connected to the alternating current power grid through the first inductor; the plurality of H-bridge topologies are connected with the plurality of resonant type isolation bidirectional DC/DC converters in a one-to-one correspondence manner, and the direct current side of the H-bridge topology is connected with the primary side direct current side of the resonant type isolation bidirectional DC/DC converter;
the resonance type isolation bidirectional DC/DC converter comprises: the high-frequency transformer comprises a first H-bridge bidirectional converter, a first resonant element, a high-frequency transformer, a second resonant element and a second H-bridge bidirectional converter; the direct current side of the first H-bridge bidirectional converter is connected with the direct current side of the H-bridge topology, the alternating current side of the first H-bridge bidirectional converter is connected with the first end of the first resonance element, the second end of the first resonance element is connected with the primary side of the high-frequency transformer, the secondary side of the high-frequency transformer is connected with the first end of the second resonance element, the second end of the second resonance element is connected with the alternating current side of the second H-bridge bidirectional converter, the direct current side of the second H-bridge bidirectional converter, namely the secondary side direct current side of the resonance type isolation bidirectional DC/DC converter, forms a direct current bus, and the power equipment is connected to the direct current bus; the power equipment comprises new energy equipment, energy storage battery equipment and load equipment;
the first resonant element comprises a first resonant inductor, a first resonant capacitor and a third resonant inductor; the first resonant inductor and the first resonant capacitor are connected in series between the alternating current side of the first H-bridge bidirectional converter and the primary side of the high-frequency transformer; the third resonant inductor is connected in parallel to the primary side of the high-frequency transformer; the second resonant element comprises a second resonant capacitor and a second resonant inductor; the second resonant capacitor and the second resonant inductor are connected in series between the secondary side of the high-frequency transformer and the alternating current side of the second H-bridge bidirectional converter;
the first resonance inductor and the first resonance capacitor form a first resonance frequency, the second resonance inductor and the second resonance capacitor form a second resonance frequency, the third resonance inductor, the first resonance inductor and the first resonance capacitor form a third resonance frequency, and the third resonance inductor, the second resonance inductor and the second resonance capacitor form a fourth resonance frequency.
2. The new energy grid-connected or on-site consumption system based on an electric energy router according to claim 1, wherein the electric energy router further comprises a plurality of electric energy conversion topology modules; the power equipment is connected to the direct current bus through the electric energy conversion topology module.
3. The new energy grid-connected or on-site consumption system based on the electric energy router according to claim 2, wherein the plurality of electric energy conversion topology modules are respectively a new energy access electric energy conversion topology module, an energy storage battery access electric energy conversion topology module, an alternating current load access electric energy conversion topology module and a direct current load access electric energy conversion topology module;
the new energy equipment is connected to the direct current bus through the new energy access electric energy conversion topology module;
the energy storage battery access electric energy conversion topological module is a two-quadrant DC/DC conversion circuit, and the energy storage battery equipment is connected to the direct current bus through the two-quadrant DC/DC conversion circuit;
the alternating current load access electric energy conversion topology module is a DC/AC inverter, and alternating current load equipment in the load equipment is connected to the direct current bus through the DC/AC inverter;
the direct current load access electric energy conversion topology module is a DC/DC converter, and direct current load equipment in the load equipment is connected to the direct current bus through the DC/DC converter.
4. The new energy grid-connected or on-site consumption system based on the electric energy router of claim 3, wherein the new energy access electric energy conversion topology module comprises a wind power generation access electric energy conversion topology submodule and a photovoltaic power generation access electric energy conversion topology submodule;
the wind power generation access electric energy conversion topological submodule is a three-phase bridge type full-control rectifying circuit, and wind power generation equipment in the new energy equipment is connected to the direct-current bus through the three-phase bridge type full-control rectifying circuit;
the photovoltaic power generation access electric energy conversion topological submodule is a Boost DC/DC converter, and photovoltaic power generation equipment in the new energy equipment is connected to the direct current bus through the Boost DC/DC converter.
5. The new energy grid-connected or on-site consumption system based on the electric energy router as claimed in claim 3, wherein the two-quadrant DC/DC conversion circuit specifically comprises: the first full-control type switch device, the second full-control type switch device and the second inductor;
the first end of the second inductor is connected with the energy storage battery, and the emitter of the first fully-controlled switching device and the collector of the second fully-controlled switching device are both connected with the second end of the second inductor; and the collector of the first fully-controlled switching device and the emitter of the second fully-controlled switching device are respectively connected with the positive end and the negative end of the direct-current bus.
6. The electric energy router-based new energy grid-connected or on-site consumption system according to claim 3, wherein the DC/DC converter is a Buck DC/DC converter, a Boost DC/DC converter, a Cuk DC/DC converter or a two-quadrant DC/DC converter.
7. The new energy grid-connected or on-site consumption system based on the electric energy router as claimed in claim 1, wherein the cascaded H-bridge bidirectional converter specifically comprises: a plurality of H-bridge topologies and a plurality of capacitors;
the alternating current side of a plurality of H-bridge topologies is cascaded to form a multi-level output;
the plurality of H-bridge topologies correspond to the plurality of direct current side capacitors one by one, and the direct current sides of the H-bridge topologies are connected with the capacitors in parallel and used for filtering alternating current components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910619085.4A CN110336320B (en) | 2019-07-10 | 2019-07-10 | New energy grid-connected or on-site consumption system based on electric energy router |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910619085.4A CN110336320B (en) | 2019-07-10 | 2019-07-10 | New energy grid-connected or on-site consumption system based on electric energy router |
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| CN111600487B (en) * | 2020-03-14 | 2022-09-13 | 青岛鼎信通讯股份有限公司 | Control method for improving DCDC efficiency of charging station energy router system |
| CN113726136B (en) * | 2020-05-26 | 2023-11-03 | 台达电子企业管理（上海）有限公司 | conversion device |
| CN112260543B (en) * | 2020-09-19 | 2022-06-24 | 许继电源有限公司 | High-gain high-frequency isolation bidirectional cascade DC/DC converter and control method thereof |
| CN112350609A (en) * | 2020-12-07 | 2021-02-09 | 哈尔滨理工大学 | Delta rectifier design related to energy router topological structure |
| CN115037120B (en) * | 2022-06-09 | 2024-04-30 | 合肥工业大学 | Two-stage energy router system and method based on modularized multiport converter |
| CN117155157A (en) * | 2023-08-15 | 2023-12-01 | 江苏科曜能源科技有限公司 | Energy storage device and system with bidirectional high-frequency isolation |
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