CN113904377A - Multifunctional multi-port modular energy router device - Google Patents
Multifunctional multi-port modular energy router device Download PDFInfo
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- CN113904377A CN113904377A CN202111088307.8A CN202111088307A CN113904377A CN 113904377 A CN113904377 A CN 113904377A CN 202111088307 A CN202111088307 A CN 202111088307A CN 113904377 A CN113904377 A CN 113904377A
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- 239000003990 capacitor Substances 0.000 claims description 12
- 238000013461 design Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 4
- 238000011217 control strategy Methods 0.000 description 6
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- 238000007599 discharging Methods 0.000 description 5
- 230000002457 bidirectional effect Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Inverter Devices (AREA)
Abstract
The invention discloses a multifunctional multiport modular energy router device, which solves the problem that a finished device does not exist in the multifunctional multiport modular energy router device which is used for an alternating current-direct current hybrid micro-grid and flexibly interacts with a grid in the prior art. Each port adopts the modularized design, is convenient for system capacity expansion and installation and debugging, and the device has the functions of energy coordination, voltage unbalance treatment, harmonic treatment and the like simultaneously, and can effectively improve the poor electric energy quality of the regional power distribution network.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a multifunctional multi-port modular energy router device.
Background
The energy router takes electric energy as a core, collects and manages electricity, gas, cold, heat and other forms of energy, realizes the fusion of an energy system and an information system, and is a core device for supporting an energy internet. Compared with a centralized energy form, electric energy is the most easily controlled and converted energy type, so the research on energy routers is mostly limited to the field of electric energy at present, and the researched energy routers are essentially electric energy routers.
The uniflex.pm project proposed in europe proposes a single-phase structure for a back-to-back multilevel converter with a switching frequency of 2 kHz. The system can realize the functions of power multidirectional flow, electric energy quality adjustment and the like, but does not provide a direct current bus, has poor flexibility and is not beneficial to the access of direct current load, photovoltaic and energy storage.
Domestic scholars also research the topological structure, performance characteristics and control mode of the energy router. The importance of the energy router for building an energy internet is elucidated, the electric energy router is briefly analyzed in the aspects of routing protocols, energy flow modes, standardized plug and play interfaces, expandability and the like, and the device has the functions of energy coordination, voltage unbalance management, harmonic management and the like and can realize flexible capacity expansion. For example, the patent office in china, published as CN107516893A, 12/26/2017, discloses an invention named as an energy router and a power generation control method based on the energy router. The invention not only can ensure the stability of the system when various ports work cooperatively, but also makes reasonable design on the working mode. The invention provides a seven-interface direct-current bus energy router model which comprises wind energy, photovoltaic power generation, energy storage, alternating current and direct current loads, a power grid and other energy router interfaces, and designs an energy router overall control strategy aiming at the framework, wherein the energy router overall control strategy comprises two working modes of power generation according to needs and power generation to the maximum extent, and energy can be reasonably transmitted. However, at present, a multifunctional multi-port modular energy router device which is used for an alternating current-direct current hybrid micro-grid and flexibly interacts with the grid does not have a finished device at present.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a multifunctional multi-port modular energy router device which mainly comprises a grid-connected port, a distributed photovoltaic port and an energy storage port, wherein each port adopts a modular design, so that the system expansion and installation and debugging are facilitated, the device has the functions of energy coordination, voltage unbalance treatment, harmonic treatment and the like, and the poor electric energy quality of a regional power distribution network can be effectively improved.
In order to achieve the purpose, the invention adopts the following technical scheme: the device comprises a device body, inside direct current circuit breaker, DCDC power module, DCAC power module and the interchange circuit breaker of being equipped with of device body, direct current circuit breaker is connected with DCDC power module, DCDC power module is connected with DCAC power module, DCAC power module is connected with interchange circuit breaker, still be equipped with on the device body and be incorporated into the power networks port, distributed photovoltaic port and energy storage port. In order to facilitate system capacity expansion and installation and debugging, each port adopts a modular design. The multi-port router system based on modularization mainly comprises a grid-connected port, a distributed photovoltaic port and an energy storage port, can be connected to a power distribution network upwards, can receive energy storage and distributed photovoltaic downwards, and a middle direct current bus can be connected with a local load.
Preferably, the plurality of DCDC power modules are connected with each other; the DCAC power modules are connected with each other. Each power module has the functions of voltage and current acquisition and operation processing, operates independently, and realizes current sharing of each module in the system through the external characteristic droop mode and the communication mode.
Preferably, the energy storage converter further comprises a control unit, and the control unit and the DCAC power module form the energy storage converter. The energy storage converter can control the charging and discharging processes of the storage battery, carry out alternating current-direct current conversion, directly supply power for alternating current loads under the condition of no power grid, and also can realize the adjustment of active power and reactive power of the power grid.
Preferably, the DCDC power module is of a three-level Buck-Boost topology structure. The DCDC power module needs to adapt to the bidirectional flow of power, needs to be designed into a bidirectional DCDC converter, and adopts a three-level Buck-Boost topological structure due to the diversity of loads. The three-level Buck-Boost topological structure is adopted, and the three-level Buck-Boost topological structure has the following advantages: the voltage resistance of the power device is only half of that of the conventional Buck-Boost, so that the power device is suitable for high-power occasions and is convenient for device type selection; the voltage and current ripples are small, the power device can realize soft switching, and the system loss is small; the three-level output can meet the voltage requirements of more loads and can form a true bipolar structure.
Preferably, the DCAC power module adopts a three-phase I-type three-level topology structure. In order to match the three-level output characteristics of the DCDC power module, the DCAC power module adopts a three-phase I-type three-level topology.
Preferably, the DCAC power module includes an ac-side EMI filter, an ac-side LCL filter, a three-phase I-type three-level inverter circuit, a support capacitor, a dc-side EMI filter, and an ac/dc pre-charge circuit, where the dc-side EMI filter is connected to the support capacitor and the ac/dc pre-charge circuit, the support capacitor is connected to the ac/dc pre-charge circuit and the three-phase I-type three-level inverter circuit, the three-phase I-type three-level inverter circuit is connected to the ac/dc pre-charge circuit and the ac-side LCL filter, and the ac-side LCL filter is connected to the ac-side EMI filter. And the direct current side EMI filter and the alternating current side EMI filter are both connected with hot plug terminals. The alternating current side EMI filter is used for filtering high-frequency components in the inversion voltage, reducing the content of higher harmonics in the output current and improving the quality of electric energy; the three-phase I-type three-level inverter circuit is used for realizing the conversion of energy at the AC side and the DC side; the supporting capacitor is used for supporting direct-current voltage when the energy storage converter works normally; the direct current side EMI filter is used for filtering high-frequency ripples in the input voltage and stabilizing the input voltage. Each power module has the functions of voltage and current acquisition and operation processing, operates independently, and realizes current sharing of each module in the system through the external characteristic droop mode and the communication mode.
Preferably, the alternating current/direct current pre-charging circuit comprises a direct current pre-charging circuit and an alternating current pre-charging circuit, the alternating current pre-charging circuit comprises a direct current discharging circuit, the direct current pre-charging circuit is connected with the direct current side EMI filter and the direct current discharging circuit, and the alternating current pre-charging circuit is connected with the hot plug terminal. The pre-charging function is completed when the energy storage converter is started, the pre-charging loop is usually connected with a pre-charging resistor in series to limit the current during pre-charging, and the pre-charging loop is cut off after pre-charging is completed.
Preferably, the DCAC power module further includes a grid-connected relay, and the grid-connected relay is connected to the ac-side EMI filter and the ac-side LCL filter. The grid-connected relay is a relay coil drive applied to grid connection and grid disconnection.
Preferably, the DCDC power module includes a direct current EMI filter and an IGBT module, the direct current EMI filter is connected to the IGBT module, and the IGBT module is further connected to a hot plug terminal.
Therefore, the invention has the following beneficial effects: 1. the energy storage converter is provided, the accurate adjustment of the VSG control on the active power in a grid-connected mode is realized, the seamless switching transient process of grid connection and grid disconnection is realized, and the daily operation and the capacity amplification are facilitated; 2. the device has the functions of energy coordination, voltage unbalance treatment, harmonic treatment and the like, and can effectively improve the poor electric energy quality of the regional power distribution network; 3. each port adopts a modular design, so that system expansion and installation and debugging are facilitated.
Drawings
FIG. 1 is a schematic diagram of the power distribution network of the present invention;
FIG. 2 is a block diagram of the DCDC power module topology of the present invention;
FIG. 3 is a block diagram of the DCAC power module topology of the present invention;
FIG. 4 is a simulation waveform of the virtual synchronous generator control grid connection of the energy storage converter of the present invention;
FIG. 5 is a VSG control strategy steady state waveform of the present invention;
figure 6 is a VSG control strategy and off-grid seamless handover waveform of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
this embodiment is a multi-functional multiport modularization energy router device, its distribution network structure is shown in fig. 1, including a plurality of direct current circuit breaker, a plurality of DCDC power module, a plurality of DCAC power module and a plurality of interchange circuit breaker, direct current circuit breaker is connected with DCDC power module, DCDC power module is connected with DCAC power module, DCAC power module is connected with interchange circuit breaker, interconnect between the DCDC power module. The direct current circuit breaker is combined with power electronic devices, is used for breaking a direct current loop, realizes the direct current breaking moment as a current zero crossing point, can accurately protect the electric power storage function, and prevents faults of overload, short circuit and the like of the electric quantity of the automatic device. The direct current breaker has the advantages of current limiting and arc extinguishing capabilities, and can quickly break fault current in direct current distribution, so that differential matching is greatly improved. The DCDC power module is used for carrying out direct current conversion and converting different voltages into required voltages; the DCAC power module is used for alternating current-direct current conversion. The alternating current circuit breaker adopts a three-phase strut type structure, and has the characteristics of stable and reliable switching-off performance, no combustion and explosion hazard, maintenance-free, small volume, light weight, long service life and the like. The AC high-voltage circuit breaker is the main power control equipment of the substation, and can cut off and connect the no-load and load current of lines and various electrical equipment when the system normally operates; when the system has a fault, the relay protection circuit can be matched with relay protection to quickly cut off the fault current so as to prevent the accident range from being enlarged.
As shown in fig. 2, the DCDC power module needs to be designed as a bidirectional DCDC converter in order to accommodate the bidirectional flow of power. Most classical is the Buck-Boost circuit topology with Buck-Boost capability. In consideration of the diversity of loads, the invention adopts a three-level Buck-Boost topology, which comprises the following steps: the direct current EMI filter is connected with the IGBT module, and the IGBT module is further connected with a hot plug terminal.
The voltage resistance of the three-level Buck-Boost topological structure power device is only half of that of the traditional Buck-Boost, so that the three-level Buck-Boost topological structure power device is suitable for high-power occasions and is convenient for device type selection; the voltage and current ripples are small, the power device can realize soft switching, and the system loss is small; the three-level output can meet the voltage requirements of more loads and can form a true bipolar structure.
In order to match the three-level output characteristics of the DCDC power module, the DCAC power module adopts a three-phase I-type three-level topology. As shown in fig. 3, the DCAC power module includes an AC-side EMI filter, an AC-side LCL filter, a three-phase I-type three-level inverter circuit (DC/AC), a supporting capacitor, a DC-side EMI filter, and an AC/DC pre-charging circuit, where the DC-side EMI filter is connected to the supporting capacitor and the AC/DC pre-charging circuit, the supporting capacitor is connected to the AC/DC pre-charging circuit and the three-phase I-type three-level inverter circuit, the three-phase I-type three-level inverter circuit is connected to the AC/DC pre-charging circuit and the AC-side LCL filter, and the AC-side LCL filter is connected to the AC-side EMI filter. The alternating current-direct current pre-charging circuit comprises a direct current pre-charging circuit and an alternating current pre-charging circuit, the alternating current pre-charging circuit comprises a direct current discharging circuit, the direct current pre-charging circuit is connected with the direct current side EMI filter and the direct current discharging circuit, and the alternating current pre-charging circuit is connected with the hot plug terminal. The three-phase I-type three-level inverter circuit (DC/AC) is composed of a plurality of IGBT elements.
The alternating current side LCL filter is used for filtering high-frequency components in the inversion voltage, reducing the content of higher harmonics in the output current and improving the quality of electric energy; the network side reactor can be designed independently or equivalent to the leakage reactance of a power frequency isolation transformer. The three-phase full-bridge inverter circuit (DC/AC) realizes the conversion of the energy at the AC side and the DC side; the support capacitor plays a role in supporting direct-current voltage when the energy storage converter works normally; the direct current side EMI filter is used for filtering high-frequency ripples in the input voltage and stabilizing the input voltage; the alternating current and direct current pre-charging loops complete the pre-charging function when the converter is started, the pre-charging loops are usually connected with pre-charging resistors in series to limit the current during pre-charging, and the pre-charging loops are cut off after pre-charging is completed.
In order to verify the performance of the device, a simulation platform of a matlab-based modular energy storage converter (the number of power modules is 2) is built. The modularized energy storage converter adopts an I-type three-level full-bridge topology, the filter adopts an LCL filter, and the rated power is 50 kva. The local controller is composed of a current loop, a voltage loop and a PQ power loop, and the VSG virtual output impedance is set to be 2 mH. The system parameters of the simulation platform are shown in the following table:
| rated output | 2*50kW |
| Rated voltage | 380V |
| Switching frequency | 20kHz |
| Current transformer L1 filter inductor | 600uH |
| Current transformer L2 filter inductor | 40uH |
| Filter capacitor of converter | 20uF |
| Short circuit capacity of transformer | 2500kVA |
| X/R ratio of transformer | 7 |
Fig. 4 shows a control grid-connected simulation waveform of the virtual synchronous generator of the modular energy storage converter. At 0.1s, the modular energy storage converter is connected to the grid in a VSG working mode, and the output active power is increased to 20 kW. As can be seen from FIG. 5, the energy storage converter has the advantages of stable start, good waveform quality and stable operation.
The built experimental platform is located at the tail end of a regional power grid distribution network, the frequency fluctuation is slightly large, the electric energy quality such as harmonic waves is poor, and the storage battery energy storage converter adopting a virtual synchronous generator VSG control strategy operates in a stable state. The experimental waveform is shown in fig. 5, wherein the power instruction is 20kW, the frequency standard is 50Hz, and the actual output is 20 kW. C1 and C2 are respectively a grid voltage waveform and grid-connected output current of the storage battery energy storage converter, and Z1 and Z2 are respectively partial enlarged views of C1 and C2. As can be seen from fig. 5, the grid voltage frequency measured by the oscilloscope is 50.026Hz, the output current of the storage battery energy storage converter with the C2 channel hardly fluctuates within 20s, and the energy storage converter realizes the accurate regulation of active power controlled by the VSG in the grid-connected mode, and can be well adapted to the poor power quality of the regional power distribution network.
The waveform of the grid-connected and off-grid seamless switching experiment adopting the virtual synchronous generator VSG control strategy is shown in FIG. 6, and the grid-connected power instruction is 20kW, the frequency reference is 50Hz, and the actual output is 20kW before the time t 1. C1 and C2 are respectively a grid voltage waveform and output current of the storage battery energy storage converter, and Z1 and Z2 are respectively partial enlarged views of C1 and C2. the grid-connected switch is disconnected at the time of t1, the energy storage converter working in a VSG mode carries a local load, and as can be seen from Z1 and Z2, the output voltage of the energy storage converter does not have sudden change at the time of t1, the seamless switching transient process of grid connection and grid disconnection is perfectly realized, and the load is changed from the simultaneous power supply of the power grid and the energy storage converter into the independent power supply of the energy storage converter.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (9)
1. The utility model provides a multi-functional multiport modularization energy router device, its characterized in that, includes the device body, inside direct current circuit breaker, DCDC power module, DCAC power module and the alternating current circuit breaker of being equipped with of device body, direct current circuit breaker is connected with DCDC power module, DCDC power module is connected with DCAC power module, DCAC power module is connected with the alternating current circuit breaker, still be equipped with on the device body and be incorporated into the power networks port, distributed photovoltaic port and energy storage port.
2. The multi-function, multi-port modular energy router device of claim 1, wherein a plurality of said DCDC power modules are interconnected; the DCAC power modules are connected with each other.
3. The multi-function, multi-port modular energy router device of claim 1, further comprising a control unit, wherein the control unit and the DCAC power module form an energy storage converter.
4. The multi-function, multi-port, modular energy router device of claim 1, wherein the DCDC power module is a three-level Buck-Boost topology.
5. The multi-function, multi-port modular energy router device of claim 4, wherein said DCAC power module employs a three-phase type I three-level topology.
6. The multi-functional multi-port modular energy router device of claim 1, 3 or 5, wherein the DCAC power module comprises an AC-side EMI filter, an AC-side LCL filter, a three-phase I-type three-level inverter circuit, a support capacitor, a DC-side EMI filter and a DC/AC pre-charge circuit, the DC-side EMI filter is connected with the support capacitor and the DC/AC pre-charge circuit, the support capacitor is connected with the DC/AC pre-charge circuit and the three-phase I-type three-level inverter circuit, the three-phase I-type three-level inverter circuit is connected with the DC/AC pre-charge circuit and the AC-side LCL filter, and the AC-side LCL filter is connected with the AC-side EMI filter.
7. The multi-function multi-port modular energy router device as claimed in claim 6, wherein the AC/DC pre-charge circuit comprises a DC pre-charge circuit and an AC pre-charge circuit, the AC pre-charge circuit comprises a DC discharge circuit, the DC pre-charge circuit is connected with the DC side EMI filter and the DC discharge circuit, and the AC pre-charge circuit is connected with the hot swap terminal.
8. The multi-functional multi-port modular energy router device of claim 6, wherein said DCAC power module further comprises a grid-tie relay, said grid-tie relay being connected to said AC side EMI filter and said AC side LCL filter.
9. The multi-function multi-port modular energy router device of claim 1 or 4, wherein the DCDC power module comprises a DC EMI filter and an IGBT module, the DC EMI filter is connected with the IGBT module, and the IGBT module is further connected with a hot swap terminal.
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| CN202111088307.8A CN113904377A (en) | 2021-09-16 | 2021-09-16 | Multifunctional multi-port modular energy router device |
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| CN202111088307.8A CN113904377A (en) | 2021-09-16 | 2021-09-16 | Multifunctional multi-port modular energy router device |
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|---|---|---|---|---|
| CN116488134A (en) * | 2023-05-10 | 2023-07-25 | 北京索英电气技术股份有限公司 | Energy router |
| CN116488134B (en) * | 2023-05-10 | 2024-05-10 | 北京索英电气技术股份有限公司 | Energy router |
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Application publication date: 20220107 |
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