CN112886818A - Five-port energy router control system - Google Patents
Five-port energy router control system Download PDFInfo
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- CN112886818A CN112886818A CN202110388126.0A CN202110388126A CN112886818A CN 112886818 A CN112886818 A CN 112886818A CN 202110388126 A CN202110388126 A CN 202110388126A CN 112886818 A CN112886818 A CN 112886818A
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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
- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/007—Regulation of charging or discharging current or voltage
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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
- H02M3/1584—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 with a plurality of power processing stages connected in parallel
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a five-port energy router control system, relates to the technical field of energy routers, and aims to solve the problems that electric energy in a conventional power system is transmitted in a high-voltage alternating current or low-voltage alternating current mode, electric energy of a power supply, an energy storage device and a load related to renewable energy is often transmitted in a low-voltage direct current mode, large-scale devices can be transmitted in a high-voltage direct current mode in a centralized mode, and the conventional energy router cannot meet the use requirement. The high-voltage direct-current energy storage device is characterized in that a modularized multi-level converter is arranged between the high-voltage alternating-current port and the high-voltage direct-current port, a DAB converter is arranged between the high-voltage direct-current port and the low-voltage direct-current port, a low-voltage inverter is arranged between the low-voltage direct-current port and the low-voltage alternating-current port, the low-voltage inverter is composed of six IGBTs and an output filter, and a Buck-Boost converter is arranged between the low-voltage direct.
Description
Technical Field
The invention relates to the technical field of energy routers, in particular to a five-port energy router control system.
Background
The core device of the energy internet is an energy router based on the power electronic technology, can provide flexible and diversified electrical interfaces for different renewable energy devices and different loads, and can realize multidirectional flow of energy and management of power flow. The energy internet is a network which integrates a power electronic technology, an information communication technology and an artificial intelligence technology, and a large number of distributed and discretized power supplies, energy storage systems and loads are interconnected to realize the intercommunication and multi-level flow of various types of energy and various types of loads.
At present, electric energy in a conventional power system is transmitted in a high-voltage alternating current or low-voltage alternating current mode, electric energy of a power supply, an energy storage device and a load related to renewable energy is often transmitted in a low-voltage direct current mode, large-scale devices can be also transmitted in a high-voltage direct current mode in a centralized mode, and a conventional energy router cannot meet the use requirement. Therefore, a five-port energy router control system is urgently needed in the market to solve the problems.
Disclosure of Invention
The invention aims to provide a five-port energy router control system, which aims to solve the problems that electric energy in a conventional power system is provided to be transmitted in a high-voltage alternating current or low-voltage alternating current mode, electric energy of a power supply, an energy storage device and a load related to renewable energy is often transmitted in a low-voltage direct current mode, large-scale devices can be transmitted in a high-voltage direct current mode in a centralized mode, and a conventional energy router cannot meet the use requirement.
In order to achieve the purpose, the invention provides the following technical scheme: a five-port energy router control system comprises an energy router, a high-voltage alternating current port, a high-voltage direct current port, a low-voltage alternating current port and an energy storage device port, wherein a modularized multi-level converter is arranged between the high-voltage alternating current port and the high-voltage direct current port, two ends of the modularized multi-level converter are respectively electrically connected with the high-voltage alternating current port and the high-voltage direct current port, the modularized multi-level converter is used as a high-voltage AC/DC level, a DAB converter is arranged between the high-voltage direct current port and the low-voltage direct current port, two ends of the DAB converter are respectively electrically connected with the high-voltage direct current port and the low-voltage direct current port, the DAB converter adopts a plurality of DC/DC converters with bidirectional energy flow capacity and is, the low-voltage direct current energy storage device is characterized in that a low-voltage inverter is arranged between the low-voltage direct current port and the low-voltage alternating current port, two ends of the low-voltage inverter are electrically connected with the low-voltage direct current port and the low-voltage alternating current port respectively, the low-voltage inverter is composed of six IGBTs and an output filter, the low-voltage inverter serves as a low-voltage DC/AC level, a Buck-Boost converter is arranged between the low-voltage direct current port and the energy storage device port, two ends of the Buck-Boost converter are electrically connected with the low-voltage direct current port and the energy storage device port respectively, and the other end of the energy storage.
Preferably, the MMC converter is composed of six bridge arms, and the six bridge arms are formed by connecting a plurality of submodules in series, the submodules are single-phase inverters in a half-bridge structure, and the submodules are controlled by adopting PWM.
Preferably, the output voltage of the bridge arm is a superposition of a direct-current voltage and an alternating-current voltage, the alternating-current circuit determines the power exchanged between the MMC and an alternating-current external circuit, the direct-current circuit can enable the MMC to output the high-voltage direct-current voltage, a fine adjustment quantity is arranged in the submodule of the MMC to adjust the power input by each submodule from the direct-current circuit, the actual voltage of the submodule is compared with the rated voltage, and the direct-current voltage instruction adjustment quantity of each submodule is obtained through a proportional-integral controller.
Preferably, the DC/DC stage is connected to the high-voltage DC bus and the low-voltage DC bus, the DAB converter is composed of two H-bridge converters and a high-frequency transformer, the high-frequency transformer has an additional external inductor, and the external inductor is set when the leakage inductance of the high-frequency transformer is not satisfactory, the adjustment of the power direction and the size is controlled by the phase difference of the square wave voltage output by the primary side H-bridge and the secondary side H-bridge of DAB, the DC/DC stage is provided with a voltage closed loop, and the voltage closed loop is electrically connected to the DC port.
Preferably, the low-voltage inverter is formed by a three-phase two-level inverter and an LC filter, and the MMC converter is also a three-phase AC inverter in nature, and a current loop and a voltage loop for eliminating coupling are provided in the low-voltage DC/AC stage.
Preferably, the Buck-Boost converter adopts a half-bridge bidirectional DC/DC converter, the half-bridge bidirectional DC/DC converter forms an energy storage converter, the Buck-Boost converter is divided into a Buck converter and a Boost converter, the Buck converter is used for charging a storage battery through a low-voltage direct-current bus, the Boost converter is used for discharging the storage battery, the energy storage converter is provided with a hysteresis controller, and the required design quantity in the hysteresis controller is hysteresis width and inductance.
Preferably, the low-voltage direct current port and the storage battery are both used as voltage sources, the storage battery is provided with a charge state, the storage battery is limited to be charged when the electric quantity of the storage battery is close to a full charge state, and the storage battery is limited to be discharged when the electric quantity of the storage battery is close to a depletion state of charge.
Preferably, the inside of energy router is provided with load power feedback, and load power feedback inserts between high voltage direct current port and the low pressure direct current port, high pressure, low pressure direct current generating line in the energy router are as the direct current source of converter, low pressure load power is adjusted the phase shift angle instruction of DC/DC level through the feedforward link, low pressure load power and high voltage direct current load power pass through the feedforward link, adjust two instructions of MMC simultaneously.
Compared with the prior art, the invention has the beneficial effects that:
1. the device of the invention feeds forward the load power to the input power of a power supply through the setting of load power feedback, the high-voltage DC level, the low-voltage DC level and the low-voltage AC level of an energy router are in a voltage source mode, the energy storage level is in a specified power source mode, the high-voltage AC level is in an adjustable mode, and the phase shifting angle instruction of the DC/DC level is adjusted through a feed-forward link to reduce the fluctuation of a low-voltage DC port; the low-voltage load power and the high-voltage direct-current load power are used for simultaneously adjusting two instructions of the MMC through a feedforward link, and the fluctuation of a high-voltage direct-current port is reduced. The problem of power supply power temporarily not keep up with load power, the current transformer load power can fluctuate when changing, influences the use of energy router is solved.
2. The device can adjust the power input by each submodule from the direct current loop by setting the fine adjustment quantity in the submodule, thereby realizing the voltage balance control of the submodule and realizing the voltage balance control of the high-voltage AC/DC level capacitor. The problem of the high voltage AC/DC level electric capacity voltage regulation in-process appear undulant, reduce the result of use is solved.
3. The device of the invention connects a plurality of DC/DC converters into a structure with input, series and output in parallel through the arrangement of the plurality of DC/DC converters and the voltage closed loop, thereby removing the limitation of the withstand voltage grade of a semiconductor, maintaining the voltage of a voltage direct current port through the voltage closed loop and improving the voltage regulation effect of the DC/DC level. The problem of poor voltage regulation stability of the DC/DC level is solved.
4. The device of the invention has the advantages that through the arrangement of the power balancing loop, the parameters of the DAB converters are completely consistent, and the transmission power of each DAB converter is the same under the same phase angle instruction. In practice, however, there are slight parameter differences between the DAB converters, and therefore there are also differences in transmission power for the same phase angle command. In order to achieve the equalization of the transmission power of each converter, a power equalization loop is needed to be adopted, the output current of each DAB is compared with the average current of all DAB outputs, a small phase angle fine adjustment instruction is generated, the transmission power of each DAB is subjected to fine adjustment, and therefore the voltage equalization of each capacitor is achieved. The problem of transmission power change caused by voltage fluctuation is solved.
Drawings
FIG. 1 is a schematic diagram of an energy router of the present invention;
FIG. 2 is a schematic diagram of the input series output parallel DC/DC stage of the present invention;
FIG. 3 is a schematic diagram of the low voltage DC/AC stage circuit of the present invention;
FIG. 4 is a circuit diagram of the energy storage stage of the present invention;
fig. 5 is a control schematic of the energy storage stage of 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.
Referring to fig. 1-5, an embodiment of the present invention is shown: a five-port energy router control system comprises an energy router, a high-voltage alternating current port, a high-voltage direct current port, a low-voltage alternating current port and an energy storage device port, wherein a modularized multi-level converter is arranged between the high-voltage alternating current port and the high-voltage direct current port, two ends of the modularized multi-level converter are respectively electrically connected with the high-voltage alternating current port and the high-voltage direct current port, the modularized multi-level converter is used as a high-voltage AC/DC level, a DAB converter is arranged between the high-voltage direct current port and the low-voltage direct current port, two ends of the DAB converter are respectively electrically connected with the high-voltage direct current port and the low-voltage direct current port, the DAB converter adopts a plurality of DC/DC converters with bidirectional energy flow capacity and is connected into a structure with input, series and output, and two ends of the low-voltage inverter are respectively electrically connected with the low-voltage direct current port and the low-voltage alternating current port, the low-voltage inverter is composed of six IGBTs and an output filter, the low-voltage inverter is used as a low-voltage DC/AC level, a Buck-Boost converter is arranged between the low-voltage direct current port and the energy storage device port, two ends of the Buck-Boost converter are respectively electrically connected with the low-voltage direct current port and the energy storage device port, and the other end of the energy storage device port is connected with a storage battery.
Further, the MMC converter is composed of six bridge arms, a plurality of submodules are connected in series on the six bridge arms, the submodules are single-phase inverters in a half-bridge structure, and the submodules are controlled by PWM. The voltage balance can be realized through six bridge arms, the direct current voltages of the upper bridge arm and the lower bridge arm of the same phase are the same, and the alternating current voltages are in opposite phases.
Furthermore, the output voltage of the bridge arm is the superposition of a direct current voltage and an alternating current voltage, an alternating current circuit determines the power exchanged between the MMC and an alternating current external circuit, the direct current circuit can enable the MMC to output a high-voltage direct current voltage, a fine adjustment quantity is arranged in the submodule of the MMC to adjust the power input by each submodule from the direct current circuit, the actual voltage of the submodule is compared with the rated voltage, and the direct current voltage instruction adjustment quantity of each module is obtained through a proportional-integral controller.
Further, the DC/DC stage is connected with the high-voltage direct-current bus and the low-voltage direct-current bus, the DAB converter is composed of two H-bridge converters and a high-frequency transformer, the high-frequency transformer is provided with an additional external inductor, the external inductor is arranged under the condition that the leakage inductance of the high-frequency transformer is not required, the adjustment of the power direction and the size is controlled through the phase difference of square wave voltages output by the primary side H-bridge and the secondary side H-bridge of the DAB, the DC/DC stage is provided with a voltage closed loop, and the voltage closed loop is electrically connected with the. The limitation of the semiconductor voltage-resistant grade can be relieved by connecting a plurality of DC/DC converters into a structure with input connected in series and output connected in parallel, and the DC/DC converters have the advantages of symmetrical structure, simple control and quick dynamic response and are suitable for being used as the DC/DC grade of the energy router.
Further, the low-voltage inverter is composed of a three-phase two-level inverter and an LC filter, the MMC converter is also a three-phase alternating-current inverter in nature, and a current loop and a voltage loop for eliminating coupling are arranged in the low-voltage DC/AC level. 750V direct current voltage of a low-voltage direct current bus can be converted into 380V three-phase alternating current voltage through the low-voltage inverter, and coupling quantity can be introduced into a current loop and a voltage loop, so that a coupling link in an inverter model is offset.
Further, the Buck-Boost converter adopts a half-bridge bidirectional DC/DC converter, the half-bridge bidirectional DC/DC converter forms an energy storage converter, the Buck-Boost converter is divided into the Buck converter and the Boost converter, the Buck converter is used for charging a storage battery through a low-voltage direct-current bus, the Boost converter is used for discharging the storage battery, the energy storage converter is provided with a hysteresis controller, and the required design amount in the hysteresis controller is hysteresis width and inductance. The Buck-Boost converter can realize charging and discharging regulation of energy sources, so that charging and discharging are realized.
Furthermore, the low-voltage direct current port and the storage battery are both used as voltage sources, the storage battery is provided with a charge state, the storage battery is limited to be charged when the electric quantity of the storage battery is close to a full charge state, and the storage battery is limited to be discharged when the electric quantity of the storage battery is close to a depletion charge state. The electric quantity storage state of the storage battery can be detected through the charge state, so that the charge and discharge of the storage battery are judged.
Furthermore, a load power feedback is arranged inside the energy router and is connected between the high-voltage direct-current port and the low-voltage direct-current port, a high-voltage direct-current bus and a low-voltage direct-current bus in the energy router are used as direct-current sources of the converter, the low-voltage load power adjusts a phase shift angle instruction of a DC/DC level through a feedforward link, and the low-voltage load power and the high-voltage direct-current load power adjust two instructions of the MMC simultaneously through the feedforward link. The voltage fluctuation caused by load disturbance can be restrained through load power feedback, and the using effect of the converter is improved.
The working principle is as follows: when the charging state is lower than the charging threshold value, the Buck-Boost converter is in a Buck working state and is charged, an external high-voltage alternating current power supply can be converted into a high-voltage direct current power supply by virtue of the MMC converter, the converted high-voltage direct current power supply can be converted into a low-voltage direct current power supply again by virtue of the DAB converter, the low-voltage direct current power supply is injected into a storage battery in a Buck working mode in the Buck-Boost converter, S1 serves as a switching tube at the moment, and S2 only utilizes a freewheeling diode; when the charge state is higher than the discharge threshold value, the Buck-Boost converter is in a Boost working state to discharge, the electric energy in the storage battery is output by means of a Boost working mode in the Buck-Boost converter, and then the low-voltage direct-current power supply is converted into a high-voltage direct-current power supply by means of the low-voltage inverter, so that power can be supplied to the electric equipment.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. The utility model provides a five port energy router control system, includes energy router, high-pressure interchange port, high voltage direct current port, low pressure interchange port and energy storage equipment port, its characterized in that: the high-voltage DC/DC converter is characterized in that a modularized multi-level converter is arranged between the high-voltage AC port and the high-voltage DC port, two ends of the modularized multi-level converter are respectively electrically connected with the high-voltage AC port and the high-voltage DC port, the modularized multi-level converter is used as a high-voltage AC/DC level, a DAB converter is arranged between the high-voltage DC port and the low-voltage DC port, two ends of the DAB converter are respectively electrically connected with the high-voltage DC port and the low-voltage DC port, the DAB converter adopts a plurality of DC/DC converters with bidirectional energy flow capacity and is connected into a structure with input series connection and output parallel connection, the DAB converter is used as a DC/DC level, a low-voltage inverter is arranged between the low-voltage DC port and the low-voltage AC port, two ends of the low-voltage inverter are respectively, and the low-voltage inverter is used as a low-voltage DC/AC level, a Buck-Boost converter is arranged between the low-voltage DC port and the energy storage device port, two ends of the Buck-Boost converter are respectively electrically connected with the low-voltage DC port and the energy storage device port, and the other end of the energy storage device port is connected with a storage battery.
2. The five-port energy router control system of claim 1, wherein: the MMC converter comprises six bridge arms, wherein the six bridge arms are formed by connecting a plurality of sub-modules in series, the sub-modules adopt single-phase inverters of half-bridge structures, and the sub-modules adopt PWM control.
3. The five-port energy router control system of claim 2, wherein: the output voltage of the bridge arm is the superposition of a direct current voltage and an alternating current voltage, the alternating current circuit determines the power exchanged between the MMC and an alternating current external circuit, the direct current circuit can enable the MMC to output a high-voltage direct current voltage, fine adjustment quantities are arranged in submodules of the MMC to adjust the power input by the submodules from the direct current circuit, the actual voltage of the submodules is compared with the rated voltage, and the direct current voltage instruction adjustment quantities of the submodules are obtained through a proportional-integral controller.
4. The five-port energy router control system of claim 1, wherein: the DAB converter is composed of two H-bridge converters and a high-frequency transformer, the high-frequency transformer is provided with an additional external inductor, the external inductor is arranged under the condition that the leakage inductance of the high-frequency transformer is not required, the adjustment of the power direction and the size is controlled by the phase difference of square wave voltage output by the primary side H bridge and the secondary side H bridge of the DAB, the DC/DC stage is provided with a voltage closed loop, and the voltage closed loop is electrically connected with a direct current port.
5. The five-port energy router control system of claim 1, wherein: the low-voltage inverter is composed of a three-phase two-level inverter and an LC filter, the MMC converter is also a three-phase alternating-current inverter essentially, and a current loop and a voltage loop for eliminating coupling are arranged in the low-voltage DC/AC level.
6. The five-port energy router control system of claim 1, wherein: the Buck-Boost converter adopts a half-bridge bidirectional DC/DC converter, the half-bridge bidirectional DC/DC converter forms an energy storage converter, the Buck-Boost converter is divided into a Buck converter and a Boost converter, the Buck converter is used for charging a storage battery through a low-voltage direct-current bus, the Boost converter is used for discharging the storage battery, the energy storage converter is provided with a hysteresis controller, and the required design quantity in the hysteresis controller is hysteresis width and inductance.
7. The five-port energy router control system of claim 1, wherein: the low-voltage direct current port and the storage battery are both used as voltage sources, the storage battery is provided with a charge state, the storage battery is limited to be charged when the electric quantity of the storage battery is close to a full charge state, and the storage battery is limited to be discharged when the electric quantity of the storage battery is close to a depletion charge state.
8. The five-port energy router control system of claim 1, wherein: the inside of energy router is provided with load power feedback, and load power feedback inserts between high voltage direct current port and the low pressure direct current port, high pressure, low pressure direct current generating line in the energy router are as the direct current source of converter, low pressure load power adjusts the phase shift angle instruction of DC/DC level through the feedforward link, low pressure load power and high voltage direct current load power pass through the feedforward link, adjust two instructions of MMC simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110388126.0A CN112886818A (en) | 2021-04-12 | 2021-04-12 | Five-port energy router control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110388126.0A CN112886818A (en) | 2021-04-12 | 2021-04-12 | Five-port energy router control system |
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| CN112886818A true CN112886818A (en) | 2021-06-01 |
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| CN202110388126.0A Withdrawn CN112886818A (en) | 2021-04-12 | 2021-04-12 | Five-port energy router control system |
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| CN (1) | CN112886818A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123283A (en) * | 2021-11-19 | 2022-03-01 | 深圳供电局有限公司 | Direct current transformer and control method thereof |
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2021
- 2021-04-12 CN CN202110388126.0A patent/CN112886818A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123283A (en) * | 2021-11-19 | 2022-03-01 | 深圳供电局有限公司 | Direct current transformer and control method thereof |
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