CN110556833A - Multi-port microgrid energy router - Google Patents

Multi-port microgrid energy router Download PDF

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Publication number
CN110556833A
CN110556833A CN201910839487.5A CN201910839487A CN110556833A CN 110556833 A CN110556833 A CN 110556833A CN 201910839487 A CN201910839487 A CN 201910839487A CN 110556833 A CN110556833 A CN 110556833A
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CN
China
Prior art keywords
voltage
port
converter
low
direct
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Pending
Application number
CN201910839487.5A
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Chinese (zh)
Inventor
魏合民
魏合宇
王俊
蔡华
苏亚东
李志波
马强
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Electric Light Space Mechanical & Electronic Equipment Corp Ltd Of Beijing State
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Electric Light Space Mechanical & Electronic Equipment Corp Ltd Of Beijing State
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Priority to CN201910839487.5A priority Critical patent/CN110556833A/en
Publication of CN110556833A publication Critical patent/CN110556833A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
    • 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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
    • 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
    • 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
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage

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

Abstract

The invention provides a multiport microgrid energy router which comprises a high-voltage network side converter port, a low-voltage alternating-current load port, a low-voltage direct-current load port and an alternating-current power distribution network, wherein the low-voltage alternating-current load port and the low-voltage direct-current load port are connected to a direct-current bus through the high-voltage network side converter port, the direct-current bus is connected with the alternating-current power distribution network through the high-voltage network side converter port, the high-voltage network side converter is used for realizing stable control of direct-current bus voltage, the whole router is cut off when the direct-current bus voltage exceeds a set range so as to protect the safety of the energy router and low-voltage side electrical equipment, the direct-current bus is used for connecting a distributed power supply and energy storage equipment, and the power flow and real-time. The invention can realize interconnection and bidirectional energy transfer among different alternating current and direct current systems and different voltage classes, provides a standardized interface for electrical equipment, and realizes bidirectional transmission of electric energy in a system.

Description

Multi-port microgrid energy router
Technical Field
The invention relates to the technical field of direct-current micro-grids and energy Internet, in particular to a multi-port micro-grid energy router.
Background
The electric energy router is essentially a multi-port converter system with intelligent energy management, and by using the idea and function of the information router for reference, new energy sources such as power generation, energy storage and load can be conveniently accessed for reasonable allocation, so that sufficient supply of energy is realized. The micro-grid is converted from a customization and construction system into a shaping and installation product, so that the micro-grid is very favorable for rapid industrialization, and the functions and intellectualization of the micro-grid are hot spots of current research.
The energy router is a key technology of an energy internet, is an intelligent power device which provides flexible and diverse electrical interfaces based on an advanced power electronic technology and an information network technology on the basis of the existing power grid, realizes access of a large number of distributed renewable energy power generation devices, energy storage devices and various power loads to the power grid, has communication and intelligent decision-making capabilities, and realizes active management of power network energy flow and information flow. In the future, the energy Internet is in a form of coexistence of an alternating current power grid, a direct current power grid and an alternating current-direct current hybrid power grid, and the energy router needs to realize direct current synchronization of alternating current and different voltage levels in different power grid networks.
The lower switching frequency not only limits the dynamic performance of the system, but also causes the system to be too large in size and weight and huge in operation noise; in addition, because the system does not provide a direct current bus, the access of a distributed power supply and an energy storage device is not facilitated, and because the voltage class of an energy router is far away, and the power requirement is large (generally, the voltage is 10kV or more, and the megawatt capacity), for the energy router, a high-power and off-voltage converter is a main problem, the high-power and off-voltage converter often needs high-voltage and high-current switching devices, and the voltage class of the existing commercial high-power switching devices such as IGBTs, IGBTs and the like is not yet sufficient to be supported by the voltage-resistant value.
Disclosure of Invention
In view of the above, the present invention provides a multi-port microgrid energy router.
In order to solve the technical problems, the invention adopts the technical scheme that: a multi-port microgrid energy router comprises a high-voltage network side converter port, a low-voltage alternating current load port, a low-voltage direct current load port and an alternating current power distribution network, wherein the low-voltage alternating current load port and the low-voltage direct current load port are connected to a direct current bus through the high-voltage network side converter port, the direct current bus is connected with the alternating current power distribution network through the high-voltage network side converter port, the high-voltage network side converter is used for realizing stable control of direct current bus voltage, the whole router is cut off when the direct current bus voltage exceeds a set range so as to protect safety of the energy router and low-voltage side electrical equipment, the direct current bus is used for connecting a distributed power supply and energy storage equipment, and power flowing and real-time energy balance of a system are reflected through the change condition of the direct current bus voltage.
In the present invention, preferably, the high-voltage network side converter port includes a three-phase cascaded H-bridge converter and a DC/DC converter, the three-phase cascaded H-bridge converter is used for high-low voltage conversion and is directly connected to a high-voltage system, the low-voltage side of the DC/DC converter is connected in parallel to obtain a DC bus, and the DC bus is respectively connected to the low-voltage ac load port and the low-voltage DC load port.
In the present invention, preferably, the DC/DC converter is configured as an isolated bidirectional DC/DC converter, and the isolated bidirectional DC/DC converter is responsible for electrical isolation from the low voltage side and bidirectional power control.
In the present invention, preferably, the low-voltage ac load port provides a standardized interface of 380V power frequency ac, and the low-voltage ac load port is used for supplying power to an ac load in the port.
In the present invention, preferably, the low voltage dc load port provides a standardized interface for 400V dc, and the low voltage dc load port is used for supplying power to dc loads in the port.
In the invention, preferably, the three-phase cascaded H-bridge converter includes a filter inductor, an n-level full-bridge converter and a filter capacitor, the filter inductor, the n-level full-bridge converter and the filter capacitor form a high-voltage direct-current bus, the full-bridge converter realizes conversion of electric energy between alternating current and direct current by controlling on and off of four switching tubes on two bridge arms, and controls the magnitude of capacitance voltage of the high-voltage direct-current bus by controlling the duty ratio of a PWM signal.
In the present invention, preferably, the DC/DC converter adopts an isolated half-bridge DC/DC converter with a single serial/parallel number, and the DC/DC converter is composed of a boost half-bridge circuit, a high-frequency transformer, and a voltage type half-bridge circuit, so that the DC/DC converter realizes two operation modes of boost and buck.
In the invention, preferably, the three-phase cascaded H-bridge converters are connected in a Y shape, and the number of the three-phase cascaded H-bridge converters in cascade is 10.
In the present invention, preferably, the low-voltage ac load port is connected to the distributed power supply through the three-phase cascaded H-bridge converter, and when the output power of the distributed power supply exceeds the load, excess power is sent back to other ports through the three-phase cascaded H-bridge converter capable of bidirectional power transmission, and the distributed power supply is a photovoltaic distributed power supply.
In the present invention, preferably, the low-voltage dc load port is further externally connected with a distributed power supply, an energy storage device, and other dc devices, so as to implement bidirectional power transmission.
The invention has the advantages and positive effects that:
The high-voltage network side converter port is used for providing stable direct-current bus voltage to realize bidirectional power transmission, and the control comprises direct current decoupling and direct-current voltage stabilization control on the cascaded H-bridge converter and phase-shifting control on the bidirectional DC/DC converter. And constant voltage control is adopted for the low-voltage alternating current load port and the low-voltage direct current load port, so that a reliable standardized interface is provided for the router. The ports of the energy router do not need to be communicated with each other and a central controller, automatic power distribution and bidirectional transmission can be realized only according to the local information of the port and the voltage of the direct-current bus, the reliability and the availability of the whole router are improved, plug and play are realized, and the operation is convenient.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
Fig. 1 is an overall block diagram of a multi-port microgrid energy router of the present invention;
Fig. 2 is a circuit schematic diagram of a three-phase cascaded H-bridge converter of the multi-port microgrid energy router of the present invention;
Fig. 3 is a circuit schematic topology diagram of a DC/DC converter of the multi-port microgrid energy router of the present invention;
Fig. 4 is a circuit schematic topology diagram of the DC/DC converter of the multi-port microgrid energy router 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. 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.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
as shown in fig. 1 to 4, the invention provides a multi-port microgrid energy router, which comprises a high-voltage grid-side converter port, a low-voltage alternating-current load port, a low-voltage direct-current load port and an alternating-current distribution grid, the low voltage ac load port and the low voltage dc load port are connected to a dc bus through the high voltage grid side converter port, is connected with the alternating current distribution network through the high voltage network side converter port via the direct current bus, the high-voltage network side converter is used for realizing the stable control of the direct-current bus voltage, cutting off the whole router when the direct-current bus voltage exceeds a set range, so as to protect the safety of the energy router and the low-voltage side electrical equipment, the direct current bus is used for connecting the distributed power supply and the energy storage equipment, and the power flow and real-time balance of the system are reflected by the change condition of the DC bus voltage.
In this embodiment, further, the high-voltage network side converter port includes a three-phase cascaded H-bridge converter and a DC/DC converter, the three-phase cascaded H-bridge converter is used for high-low voltage conversion and is directly connected to a high-voltage system, the low-voltage side of the DC/DC converter is connected in parallel to obtain a DC bus, and the DC bus is respectively connected to the low-voltage ac load port and the low-voltage DC load port.
In this embodiment, further, the DC/DC converter is configured as an isolated bidirectional DC/DC converter, and the isolated bidirectional DC/DC converter is responsible for electrical isolation and bidirectional power control from the low-voltage side. For the operation safety of the system, the high-voltage side and the low-voltage side must be electrically isolated, and the non-isolated topology cannot meet the requirementtherefore, an isolated DC/DC converter is selected. The structure has the advantages of flexibility and changeability, and the number of the voltage multiplication circuit and the output power branch circuit can be changed according to the system requirement, so that the structure is expanded into various topological structures, and the expansion performance of the system is improved conveniently. The DC/DC converter selects an isolated half-bridge DC/DC converter structure. The two ends of the bidirectional isolation type half-bridge DC/DC converter are respectively a low-voltage side and a high-voltage side, and when the converter is in a boosting working mode, power in the system is transmitted from left to right, namely from the low-voltage side to the high-voltage side; on the contrary, when the converter is in a step-down operation mode, the power is transmitted from right to left, so that the system has the characteristic of bidirectional power flow. In boost mode, when S2When conducting, the inductance LiCharging, S2At turn-off time LiDischarge, S2The control law of the control circuit is the same as that of the Boost circuit. S1And S2Complementary conduction, the primary voltage of the transformer is a high-frequency alternating-current square wave with the amplitude of V1and-V2. High pressure side S3and S4Complementary conducting, their anti-parallel diodes common D3、D4Rectifying the high-frequency AC square wave voltage on the transformer into DC, and applying the DC to a capacitor C3、C4And charging is carried out, so that the electric energy transmission from the low-voltage side to the high-voltage side is realized. In the buck mode of operation, the circuit behaves as a combination of a buck half-bridge circuit and a current mode half-bridge circuit, with power transferred from the high-voltage side to the low-voltage side.
in this embodiment, further, the low-voltage ac load port provides a standardized interface for 380V power frequency ac, and the low-voltage ac load port is used for supplying power to an ac load in the port.
In this embodiment, further, the low-voltage dc load port provides a standardized interface for 400V dc, and the low-voltage dc load port is used for supplying power to a dc load in the port.
In this embodiment, further, the three-phase cascade H-bridge converter includes filter inductor, n-level full-bridge converter and filter capacitor, filter inductor, n-level full-bridge converter and filter capacitor constitute high voltage direct current bus, the full-bridge converter realizes the conversion of electric energy between alternating current and direct current through controlling the conduction and the disconnection of four switch tubes on two bridge arms, and through controlling the duty cycle of PWM signal, the size of the capacitance voltage of control high voltage direct current bus.
In this embodiment, the DC/DC converter further adopts an isolated half-bridge DC/DC converter with a single serial/parallel number, and the DC/DC converter is composed of a boost half-bridge circuit, a high-frequency transformer and a voltage type half-bridge circuit, so that the DC/DC converter realizes two operation modes of boost and buck. The circuit element comprises S1、S2、S3、S4Four switches, C1、C2、C3、C4Four supporting capacitors, filter inductor LiEnergy storage inductor Lpwherein L ispThe sum of the external inductance at the primary side and the leakage inductance of the transformer is represented, and V is takenLAnd VHRespectively representing the voltages at the low and high pressure sides, ignoring the voltage ripple of the capacitors, taking the voltages corresponding to each capacitor as V in turn, assuming that the support capacitor is large enough1、V2、V3、V4. When the magnitudes of leakage inductance and switching frequency are selected, the output power of the DC/DC converter is only related to terminal voltage, phase shift angle and duty ratio, the DC/DC converter is used as an intermediate stage of a system, the voltage of the high-voltage side end of the DC/DC converter is controlled by a front-stage H bridge and can be regarded as constant, the control purpose of the DC/DC converter is to output constant low-voltage direct current, and therefore, when the transmission power is constant, the duty ratio and the phase shift angle phi can be adjusted1the magnitude and phase relationship of the voltage and the current to the inverter.
In this embodiment, further, the three-phase cascaded H-bridge converters are connected in a Y shape, and the number of cascades of the three-phase cascaded H-bridge converters is 10. The cascade number of the three-phase cascade H-bridge converter is determined according to the voltage class requirement, a multi-port energy router high-voltage alternating current side is connected with a 10kV power distribution network, the cost factor when the multi-port energy router is put into practical application is considered, the higher the voltage class is, the higher the price of components is, and therefore a main switching device IGBT with a more common voltage class is selected as much as possible. Comprehensively considering the cost performance and the safety margin of the IGBT, selecting the stageThe rated voltage grade of the H-bridge direct-current side capacitor is 1KV, and the maximum effective value of the alternating voltage which can be output by each H-bridge unit is as follows:Therefore, under the condition that the three-phase cascade H-bridge converter adopts Y-shaped connection, the minimum cascade number is as follows:The number of cascades n is selected to be 10 in consideration of the operating margin.
In this embodiment, further, the low-voltage ac load port is connected to the distributed power supply through the three-phase cascaded H-bridge converter, and when the output power of the distributed power supply exceeds the load, excess power is reversely supplied to other ports through the three-phase cascaded H-bridge converter capable of bidirectional power transmission, where the distributed power supply is a photovoltaic distributed power supply.
In this embodiment, further, the low-voltage dc load port is further externally connected with a distributed power supply, an energy storage device, and other dc devices, so as to implement bidirectional power transmission.
The working principle and the working process of the invention are as follows: the DC/DC converter adopts an isolated half-bridge DC/DC converter with one serial-parallel number, the DC/DC converter consists of a boosting half-bridge circuit, a high-frequency transformer and a voltage type half-bridge circuit, and the circuit elements comprise S1、S2、S3、S4Four switches, C1、C2、C3、C4Four supporting capacitors, filter inductor LiEnergy storage inductor LpWherein L ispThe sum of the external inductance at the primary side and the leakage inductance of the transformer is represented, and V is takenLAnd VHRespectively representing the voltages at the low and high pressure sides, ignoring the voltage ripple of the capacitors, taking the voltages corresponding to each capacitor as V in turn, assuming that the support capacitor is large enough1、V2、V3、V4。
Because two ends of the bidirectional isolation type half-bridge DC/DC converter are respectively a low-voltage side and a high-voltage side, when the converter is in a boosting working mode, power in the system is from left to rightTo the right, i.e. from the low pressure side to the high pressure side; on the contrary, when the converter is in a step-down operation mode, the power is transmitted from right to left, so that the system has the characteristic of bidirectional power flow. In boost mode, when S2When conducting, the inductance LiCharging, S2At turn-off time LiDischarge, S2The control law of the control circuit is the same as that of the Boost circuit. S1And S2Complementary conduction, the primary voltage of the transformer is a high-frequency alternating-current square wave with the amplitude of V1and-V2. High pressure side S3And S4Complementary conducting, their anti-parallel diodes common D3、D4Rectifying the high-frequency AC square wave voltage on the transformer into DC, and applying the DC to a capacitor C3、C4And charging is carried out, so that the electric energy transmission from the low-voltage side to the high-voltage side is realized. Under the working mode of step-down, the circuit is equivalent to the combination of a step-down half-bridge circuit and a current type half-bridge circuit, power is transmitted from a high-voltage side to a low-voltage side, and the working principle and the working process are similar to those of a step-up mode.
The isolated half-bridge DC/DC converter adopts phase shift control, controls the direction and the size of power transmission by controlling the phase angle difference of bridge arm driving signals at two sides of the high-frequency transformer, and can better control the degree of freedom of a phase shift angle by the phase shift control so as to realize flexible control of transmission power.
The power transmission direction of the bidirectional isolation type half-bridge DC/DC converter is related to the lead-lag relationship of the voltage phases at two sides of the high-frequency transformer, and the magnitude of the transmission power is related to the magnitude of the phase difference. Therefore, the transmission power can be changed by changing the phase shift angle of the trigger signals of the bridge arms at two sides of the high-frequency transformer, and the power transmission direction of the system can be changed by changing the phase relation of the lead and the lag of the trigger signals.
The control quantity of direct current control is the current on the side of a power grid, the current of the method is closed-loop control, the lead-solving control of active current and reactive current can be realized, the method is also called vector control, an? energy router with better dynamic performance not only needs the capability of steady-state operation, but also needs to ensure safe and reliable operation under the conditions of load jump, access to a distributed power generation device and the like, and needs better dynamic response, so a control strategy of direct current solving is adopted.
The three-phase cascade H-bridge converter is controlled by direct current decoupling, three-phase alternating current voltage and current on the power grid side are converted into two-phase direct current quantity, active current and reactive current are decoupled, the three-phase cascade H-bridge converter specifically comprises outer ring voltage control and inner ring current control, and the three-phase cascade H-bridge converter has better internal current limiting capacity under the condition of high voltage and high power. The inner loop current control is used for ensuring that the current on the alternating current side of the converter is strictly sinusoidal and keeps the same phase with the voltage on the network side, wherein the PLL is a phase-locked loop and is used for tracking and locking the voltage of the power network and dynamically acquiring the phase information of the voltage.
The invention is characterized in that: the high-voltage network side converter port is used for providing stable direct-current bus voltage and realizing bidirectional transmission of power, and the control comprises direct current decoupling and direct-current voltage stabilization control on the cascaded H-bridge converter and phase-shifting control on the bidirectional DC/DC converter. And constant voltage control is adopted for the low-voltage alternating current load port and the low-voltage direct current load port, so that a reliable standardized interface is provided for the router. The ports of the energy router do not need to be communicated with each other and a central controller, automatic power distribution and bidirectional transmission can be realized only according to the local information of the port and the voltage of the direct-current bus, the reliability and the availability of the whole router are improved, plug and play are realized, and the use is convenient.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.

Claims (10)

1. The multi-port microgrid energy router is characterized by comprising a high-voltage network side converter port, a low-voltage alternating current load port, a low-voltage direct current load port and an alternating current power distribution network, wherein the low-voltage alternating current load port and the low-voltage direct current load port are connected to a direct current bus through the high-voltage network side converter port, the direct current bus is connected with the alternating current power distribution network through the high-voltage network side converter port, the high-voltage network side converter is used for realizing stable control of direct current bus voltage, the whole router is cut off when the direct current bus voltage exceeds a set range so as to protect the safety of the energy router and low-voltage side electrical equipment, the direct current bus is used for connecting a distributed power supply and energy storage equipment, and the power flow and real-time energy balance of a system are reflected through the change condition of the direct current bus voltage.
2. The multi-port microgrid energy router of claim 1, wherein the high-voltage grid-side converter port comprises a three-phase cascaded H-bridge converter and a DC/DC converter, the three-phase cascaded H-bridge converter is used for high-voltage and low-voltage conversion and is directly connected into a high-voltage system, the low-voltage sides of the DC/DC converters are connected in parallel to obtain a direct-current bus, and the direct-current bus is respectively connected with the low-voltage alternating-current load port and the low-voltage direct-current load port.
3. The multi-port microgrid energy router of claim 2, wherein the DC/DC converter is configured as an isolated bidirectional DC/DC converter, and the isolated bidirectional DC/DC converter is responsible for electrical isolation and bidirectional power control from the low-voltage side.
4. The multi-port microgrid energy router of claim 1, wherein the low-voltage ac load port provides a standardized interface for 380V power frequency ac power, and the low-voltage ac load port is used for supplying power to ac loads within the port.
5. The multi-port microgrid energy router of claim 1, wherein the low-voltage direct-current load port provides a standardized interface for 400 vdc power, the low-voltage direct-current load port being used to power direct-current loads within the port.
6. The multi-port microgrid energy router of claim 2, wherein the three-phase cascaded H-bridge converter comprises a filter inductor, an n-level full-bridge converter and a filter capacitor, the filter inductor, the n-level full-bridge converter and the filter capacitor form a high-voltage direct-current bus, the full-bridge converter realizes conversion of electric energy between alternating current and direct current by controlling on and off of four switching tubes on two bridge arms, and the magnitude of capacitance voltage of the high-voltage direct-current bus is controlled by controlling duty ratio of PWM signals.
7. The multi-port microgrid energy router of claim 2, wherein the DC/DC converter adopts an isolated half-bridge DC/DC converter with a single serial-parallel number, and the DC/DC converter is composed of a boost half-bridge circuit, a high-frequency transformer and a voltage type half-bridge circuit, so that the DC/DC converter realizes two operation modes of boost and buck.
8. The multi-port microgrid energy router of claim 2, wherein the three-phase cascaded H-bridge transformers are connected in a Y shape, and the number of the three-phase cascaded H-bridge transformers in cascade is 10.
9. The multi-port microgrid energy router of claim 2, wherein the low-voltage alternating-current load port is connected to a distributed power source through the three-phase cascaded H-bridge converter, when output power of the distributed power source exceeds a load, surplus power is sent back to other ports through the three-phase cascaded H-bridge converter capable of bidirectional power transmission, and the distributed power source is a photovoltaic distributed power source.
10. The multi-port microgrid energy router of claim 1, wherein the low-voltage direct-current load port is further externally connected with direct-current equipment such as a distributed power supply and an energy storage device, so that bidirectional power transmission is realized.
CN201910839487.5A 2019-09-05 2019-09-05 Multi-port microgrid energy router Pending CN110556833A (en)

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CN111600308A (en) * 2020-03-21 2020-08-28 青岛鼎信通讯股份有限公司 Control scheme applied to three-phase and two-phase switching operation of energy router
CN111600308B (en) * 2020-03-21 2023-08-08 青岛鼎信通讯股份有限公司 Control method applied to switching operation of three phases and two phases of energy router
CN111953021A (en) * 2020-08-21 2020-11-17 华翔翔能科技股份有限公司 Little grid system that possesses safety protection function
CN112165509A (en) * 2020-08-31 2021-01-01 上海交通大学 Energy internet network architecture based on virtual energy router and design method thereof
CN112165509B (en) * 2020-08-31 2022-02-01 上海交通大学 Energy internet network architecture based on virtual energy router and design method thereof
CN112186771A (en) * 2020-10-09 2021-01-05 北京航空航天大学 Electric energy router based on matrix converter and electric energy routing method
CN115566679A (en) * 2022-11-15 2023-01-03 浙江大学 Micro-grid energy control method and system based on energy router

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Application publication date: 20191210