CN109614700B - Energy Internet simulation system based on digital-analog hybrid simulation technology - Google Patents
Energy Internet simulation system based on digital-analog hybrid simulation technology Download PDFInfo
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Abstract
The application discloses an energy Internet simulation system based on a digital-analog hybrid simulation technology, which comprises a physical simulation unit, a movable interface unit, a digital simulation unit and a master monitoring unit. The physical simulation unit and the digital simulation unit are connected through the movable interface unit; the physical simulation unit is used for dynamically simulating the energy internet based on the intelligent AC/DC hybrid power distribution network; the movable interface unit is used for carrying out analog-to-digital conversion, digital-to-analog conversion, data exchange and power exchange between the physical analog unit and the digital analog unit; the digital simulation unit is used for modeling and simulating a power distribution network, a micro-grid and a comprehensive energy system in the energy internet; the total monitoring unit is used for monitoring and displaying the physical analog unit, the movable interface unit and the digital simulation unit. The system can effectively improve the accuracy of the digital simulation model, thereby realizing panoramic accurate simulation and analysis of regional energy Internet.
Description
Technical Field
The application relates to the technical field of energy Internet simulation, in particular to an energy Internet simulation system based on a digital-analog hybrid simulation technology.
Background
The power distribution network is an important foundation of the energy internet and is also a key link for influencing the power supply service level. Along with the rapid development of distributed energy and energy internet technology, the power distribution network has the advantages of diversification of the internal charges, complexity of a grid structure, individuation of user power supply demands and comprehensive energy service demands, and the power distribution network faces huge technical and service challenges.
In order to adapt to the rapid development of the energy internet technology and realize the safe, stable and reliable operation of the power distribution network, there is a great need to develop the regional energy internet panoramic simulation and analysis technical research based on the medium-low voltage power distribution network, namely the regional energy internet panoramic simulation and analysis technical research taking electricity as a core, and construct an omnibearing, multi-scene and multi-angle energy internet comprehensive simulation system containing various energy sources such as cold, heat, electricity, gas and the like, develop the comprehensive energy optimal operation control and efficient utilization research, and have important significance for the formulation of the comprehensive energy transaction and service mode of the future regional energy internet.
At present, a method or a system for simulating the energy internet is generally realized by adopting pure energy internet simulation software, namely: and the regional energy Internet of the medium-low voltage distribution network is researched only by a mathematical modeling simulation method.
However, the existing energy internet simulation software adopts pure mathematical modeling to perform simulation, so that the simulation method and system cannot reflect the running mechanism of the multi-element distributed energy and the extremely rapid dynamic response process of the power electronic device and the like, and cannot accurately reflect the physical characteristics of the device, thereby resulting in insufficient simulation precision.
Disclosure of Invention
The application provides an energy Internet simulation system based on a digital-analog hybrid simulation technology, which aims to solve the problem of low simulation precision of energy Internet simulation software in the prior art.
In order to solve the technical problems, the embodiment of the application discloses the following technical scheme:
an energy internet simulation system based on digital-analog hybrid simulation technology, the system comprising:
the system comprises a physical simulation unit, a movable interface unit, a digital simulation unit and a main monitoring unit, wherein the physical simulation unit and the digital simulation unit are connected through the movable interface unit, and the main monitoring unit is respectively connected with the physical simulation unit, the movable interface unit and the digital simulation unit;
the physical simulation unit is used for dynamically simulating the energy Internet based on the intelligent AC/DC hybrid power distribution network;
the movable interface unit is used for performing analog-to-digital conversion, digital-to-analog conversion, data exchange and power exchange between the physical analog unit and the digital analog unit;
the digital simulation unit is used for modeling and simulating a power distribution network, a micro-grid and a comprehensive energy system in the energy internet;
the main monitoring unit is used for monitoring and displaying the physical simulation unit, the movable interface unit and the digital simulation unit.
Optionally, the physical simulation unit includes: the intelligent AC/DC hybrid power distribution network comprises an intelligent AC/DC hybrid power distribution network rack, an electric energy conversion transmission module and an electric and signal centralized wiring screen cabinet, wherein the electric and signal centralized wiring screen cabinet is connected with a movable interface unit;
the intelligent AC/DC hybrid power distribution network rack is used for simulating a power distribution network substation with a medium-low voltage level and an AC/DC hybrid power distribution network thereof;
the electric energy conversion transmission module is used for carrying out distributed storage and transmission of renewable energy sources by utilizing an electric energy conversion technology;
the electric and signal centralized wiring screen cabinet is used for integrating an electric interface accessible by the physical simulation unit and an output interface acquired by the physical simulation unit.
Optionally, the intelligent ac/dc hybrid power distribution network rack includes: the system comprises a first end module, a second end module, a third end module, a fourth end module and a fifth end module, wherein any two modules from the first end module to the fifth end module can exchange bidirectional energy;
the first end module includes: the first infinite system, the first alternating current line parameter unit and the first full-control bidirectional AC/DC converter are sequentially connected and are used for constructing a direct current bus of the direct current distribution network;
the second end module includes: the second infinite system, the second alternating current line parameter unit, the third alternating current parameter unit and the second full-control bidirectional AC/DC converter are sequentially connected and are used for dynamic power exchange and serve as a standby power interface to construct a direct current bus of the direct current power distribution network;
the third terminal module includes: the miniature gas turbine and the third full-control bidirectional AC/DC converter are connected in sequence and are used for being connected into a direct current bus of the power distribution network and simulating comprehensive utilization and output of gas, electricity, cold and heat;
the fourth end module includes: the system comprises an alternating-current micro-grid, a fourth full-control type bidirectional AC/DC converter and/or a regional alternating-current power distribution network and a fourth full-control type bidirectional AC/DC converter which are sequentially connected, wherein the regional alternating-current power distribution network and the fourth full-control type bidirectional AC/DC converter are used for simulating flexible direct-current interconnection structures of alternating-current power distribution networks in different regions;
the fifth end module includes: the battery energy storage power station and the bidirectional DC/DC converter which are sequentially connected are used for simulating the access of an energy storage system, simulating the interconnection structures of the DC power distribution networks with different voltage levels or simulating the interconnection structures of the DC micro power grids.
Optionally, the first infinite system and the second infinite system are used for simulating different substations or different outgoing lines of the same substation.
Optionally, the removable interface unit includes: a physical interface and a digital interface;
the physical interface is used for transmitting the data of the digital simulation unit to the physical simulation unit through digital-to-analog conversion;
the digital interface is used for transmitting the data of the physical analog unit to the digital simulation unit through analog-to-digital conversion.
Optionally, the physical interface includes: a power amplifier or four-quadrant power amplifier with digital-to-analog conversion function, the digital interface comprising: a sensor or a data collector with an analog-to-digital conversion function.
Alternatively, the digital simulation unit may perform electromagnetic transient simulation, electromechanical transient simulation, and electromechanical-electromagnetic transient simulation.
Optionally, the general monitoring unit includes: the device comprises a data acquisition subunit, a controller and a display subunit;
the data acquisition subunit is used for monitoring and acquiring the data of the physical simulation unit, the movable interface unit and the digital simulation unit in real time and transmitting the data to the controller;
the controller is used for analyzing the actual operation data of the physical simulation unit and the calculation result data of the digital simulation unit, obtaining an analysis result and transmitting the data of the data acquisition subunit to the display subunit;
the display subunit is used for uniformly displaying the data of the physical simulation unit, the movable interface unit and the digital simulation unit.
The technical scheme provided by the embodiment of the application can comprise the following beneficial effects:
the application provides an energy Internet simulation system based on a digital-analog hybrid simulation technology, which mainly comprises a physical simulation unit, a movable interface unit, a digital simulation unit and a general monitoring unit. The physical simulation unit can dynamically simulate the energy Internet based on the intelligent AC/DC hybrid power distribution network, the connection mode of the intelligent AC/DC hybrid power distribution network can be flexibly changed through the on-off of the remote control switch, and the regional energy Internet physical simulation system architecture based on the AC/DC hybrid power distribution network is constructed. The digital simulation unit can be used for setting corresponding parameters and interface parameters of the digital-analog connection nodes for the digital simulation model of the power distribution network, the micro-grid and the comprehensive energy system in the energy internet, and uploading wiring topology and simulation calculation results of the digital simulation model to the general monitoring unit. The physical simulation unit and the digital simulation unit can be connected through the movable interface unit, so that data exchange and power exchange between the physical simulation unit and the digital simulation unit are realized. The physical simulation unit, the digital simulation unit and the movable interface unit can be monitored and displayed according to the interface parameters of the digital-analog connection node through the total monitoring unit, so that a worker can acquire the dynamic state of the energy Internet in the whole area in time. According to the method and the device, dynamic physical simulation of the energy Internet is realized through the physical simulation unit, digital simulation can be carried out on the energy Internet through the digital simulation unit, digital simulation and real physical simulation are integrated by utilizing a digital-analog hybrid simulation technology, and the accuracy of a digital simulation model can be effectively improved, so that panoramic accurate simulation and analysis on the regional energy Internet are realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a block diagram of an energy internet simulation system based on a digital-analog hybrid simulation technology according to an embodiment of the present application;
fig. 2 is a schematic diagram of a circuit connection relationship of an energy internet simulation system based on a digital-analog hybrid simulation technology according to an embodiment of the present application.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
For a better understanding of the present application, embodiments of the present application are explained in detail below with reference to the drawings.
Referring to fig. 1, fig. 1 is a block diagram of an energy internet simulation system based on a digital-analog hybrid simulation technology according to an embodiment of the present application. As can be seen from fig. 1, the energy internet simulation system based on the digital-analog hybrid simulation technology in this embodiment mainly includes: the system comprises a physical simulation unit, a movable interface unit, a digital simulation unit and a main monitoring unit, wherein the physical simulation unit and the digital simulation unit are connected through the movable interface unit, and the main monitoring unit is respectively connected with the physical simulation unit, the movable interface unit and the digital simulation unit.
The physical simulation unit is used for dynamically simulating the energy Internet based on the intelligent AC/DC hybrid power distribution network. The physical simulation unit in this embodiment mainly includes: the intelligent AC/DC hybrid power distribution network rack, the electric energy conversion transmission module and the electric and signal centralized wiring screen cabinet are connected with the movable interface unit.
The intelligent AC/DC hybrid power distribution network rack is used for simulating a power distribution network substation with a medium-low voltage level and an AC/DC hybrid power distribution network with a voltage level mainly comprising 10kV, 400V or 380V and the like. For example: the main grid frame adopts a multi-section and multi-connection grid frame, so that a 10kV transformer substation and a power distribution network system thereof can be simulated, and a 380V low-voltage power distribution network or a 400V low-voltage power distribution network can be simulated.
Further, in this embodiment, the intelligent ac/dc hybrid power distribution network rack at least includes five ends: the first end module, the second end module, the third end module, the fourth end module and the fifth end module, wherein, the first end module can all carry out two-way energy exchange to the fifth end module, namely: two-way energy exchange can be performed between any two modules from the first end module to the fifth end module.
The first end module includes: the first infinite system, the first alternating current line parameter unit and the first full-control bidirectional AC/DC converter are sequentially connected and are used for constructing a direct current bus of the direct current distribution network. The second end module includes: the second end module adopts active or reactive power independent decoupling for dynamic power exchange and is used as a standby power interface for constructing a direct current bus of the direct current distribution network. The first infinite system and the second infinite system are both power sources taken from a main power grid, and are used for simulating different substations or different outgoing lines of the same substation, and are equivalent to one end in the embodiment and are used for energy exchange. The third terminal module includes: the miniature gas turbine and the third full-control bidirectional AC/DC converter are connected in sequence and are used for being connected into a direct current bus of the power distribution network and simulating comprehensive utilization and output of gas, electricity, cold and heat. The fourth end module includes: and the area alternating current power distribution network and the fourth full-control type bidirectional AC/DC converter are sequentially connected and are used for simulating flexible direct current interconnection structures of alternating current power distribution networks in different areas. Namely: there are three situations for the fourth terminal module: the first type is that an alternating-current micro-grid and a fourth full-control bidirectional AC/DC converter which are sequentially connected form a fourth terminal module; the second type is that the area alternating current distribution network and the fourth full-control bidirectional AC/DC converter which are connected in sequence form a fourth terminal module, and the third type is that: and after the alternating-current micro-grid and the regional alternating-current power distribution network are connected in parallel, the alternating-current micro-grid and the regional alternating-current power distribution network are connected in series with a fourth full-control bidirectional AC/DC converter to form a fourth terminal module. The fifth end module includes: the battery energy storage power station and the bidirectional DC/DC converter which are sequentially connected are used for simulating the access of an energy storage system, simulating the interconnection structures of the DC power distribution networks with different voltage levels or simulating the interconnection structures of the DC micro power grids. Namely: the fifth end module includes six scenarios: the first is a battery energy storage power station and a bidirectional DC/DC converter which are connected in sequence; the second type is a direct current micro-grid and a bidirectional DC/DC converter which are sequentially connected; the third is a direct-current power distribution network and a bidirectional DC/DC converter which are sequentially connected, and the fourth is that a battery energy storage power station and a direct-current micro-grid are connected in parallel and then connected in series with the bidirectional DC/DC converter; the fifth is that after the direct-current micro-grid and the direct-current distribution network are connected in parallel, the direct-current micro-grid and the direct-current distribution network are connected in series with a bidirectional DC/DC converter; the sixth is that after the battery energy storage power station and the direct current power distribution network are connected in parallel, the battery energy storage power station and the direct current power distribution network are connected in series with the bidirectional DC/DC converter; and the seventh is to connect the battery energy storage power station, the direct-current micro-grid and the direct-current power distribution network in parallel and then connect the battery energy storage power station, the direct-current micro-grid and the direct-current power distribution network in series with the bidirectional DC/DC converter.
According to the embodiment, the intelligent AC/DC hybrid power distribution network rack is adopted, the on-off of the switch is controlled remotely through the monitoring platform of the physical simulation unit, so that the wiring mode of the physical simulation unit is changed flexibly, the required regional energy Internet physical simulation system architecture is constructed, the actual operation result is output, and finally the actual operation result is transmitted to the main monitoring unit through the monitoring platform of the physical simulation unit. Therefore, the intelligent AC/DC hybrid power distribution network rack is adopted in the embodiment, the structure is high in flexibility, and the multi-section and multi-contact network rack is adopted, so that the flexibility of the whole energy Internet simulation system can be greatly improved, and the simulation precision is improved due to the fact that the operation mechanism and physical characteristics of various devices can be simulated.
The electric energy conversion transmission module is used for carrying out distributed storage and transmission of renewable energy sources by utilizing an electric energy conversion technology. The electric and signal centralized wiring screen cabinet is used for integrating an electric interface accessible by the physical simulation unit and an output interface acquired by the physical simulation unit. The electric and signal centralized wiring screen cabinet can carry out block and partition modularized configuration on the access position of the key electric node and the secondary signals collected by the physical simulation unit, is easy to distinguish and convenient to wire, and is favorable for improving the operability of the device.
According to the structure of the physical simulation unit, the physical simulation unit is arranged, so that elements included in the energy Internet simulation system are more abundant and diversified, and the net rack is flexible and convenient to control.
The movable interface unit is used for carrying out analog-to-digital conversion, digital-to-analog conversion, data exchange and power exchange between the physical analog unit and the digital analog unit.
The removable interface unit in this embodiment mainly includes a physical interface and a digital interface. The physical interface is used for transmitting the data of the digital simulation unit to the physical simulation unit through digital-to-analog conversion; the digital interface is used for transmitting the data of the physical analog unit to the digital simulation unit through analog-to-digital conversion.
Further, the physical interface includes a power amplifier with digital-to-analog conversion function or a four-quadrant power amplifier, and the digital interface includes: a sensor or a data collector with an analog-to-digital conversion function.
The movable interface unit in the embodiment can flexibly move and can flexibly move in front of the electric and signal centralized wiring screen cabinet, so that different nodes of the physical simulation unit can be accessed, and data of the physical simulation unit can be conveniently and timely acquired. In addition, the movable interface unit can flexibly move, so that complex wiring operation caused by overlong wiring can be avoided, and the whole energy Internet simulation system is simple and convenient to operate and easy to popularize.
With continued reference to fig. 1, the energy internet simulation system of the present embodiment further includes a digital simulation unit, which is configured to model and simulate a power distribution network, a micro-grid, and a comprehensive energy system in the energy internet. The digital simulation unit can perform electromagnetic transient simulation, electromechanical transient simulation and electromechanical-electromagnetic transient simulation. The digital simulation unit in this embodiment may be implemented by using commercial digital simulation software, for example: ADPSS simulation software or RT-LAB simulation software.
The setting of the digital simulation unit in the embodiment can realize the real-time simulation of the power in the loop, can meet the requirement of accurate simulation in multiple time scales of the power distribution network, and is beneficial to improving the simulation accuracy of the energy Internet simulation system. And the digital simulation unit is connected with the physical simulation unit through the movable interface unit, and can provide support for the physical simulation unit through the physical interface in the movable interface unit, so that the expandability and flexibility of the energy Internet simulation system are improved, and the maximum simulation scale and economy of the energy Internet simulation system are further improved.
The total monitoring unit is used for monitoring and displaying the physical analog unit, the movable interface unit and the digital simulation unit.
The general monitoring unit in this embodiment mainly includes: the device comprises a data acquisition subunit, a controller and a display subunit. The data acquisition subunit is used for monitoring and acquiring the data of the physical simulation unit, the movable interface unit and the digital simulation unit in real time and transmitting the data to the controller; the controller is used for analyzing the actual operation data of the physical simulation unit and the calculation result data of the digital simulation unit, obtaining an analysis result and transmitting the data of the data acquisition subunit to the display subunit; and the display subunit is used for uniformly displaying the data of the physical simulation unit, the movable interface unit and the digital simulation unit.
The working principle of the energy internet simulation system based on the digital-analog hybrid simulation technology in the embodiment of the application is described in detail from the viewpoint of circuit connection relation.
Referring to fig. 2, fig. 2 is a schematic diagram of a circuit connection relationship of an energy internet simulation system based on a digital-analog hybrid simulation technology according to an embodiment of the present application. In fig. 2, 1 is a physical simulation unit, 2 is an electric and signal centralized wiring screen cabinet, 3 is a movable interface unit, 4 is a digital simulation unit, and 5 is a general monitoring unit.
Wherein the physical simulation unit 1 comprises: all parts numbered 6-25. The system 6 is a first infinite system, the system 7 is a second infinite system, the system 8 is a diesel generator, and the system 8 is also used as one of alternating current power sources of the power distribution network, is a form of energy utilization and alternating current power output, and can be used for research of black start and isolated network operation modes of the power distribution network. 9 is a miniature gas turbine, has the function of CCHP (Combined Cool ing Heating and Power, combined heat and power supply system, also called cogeneration system), is a form of comprehensive utilization of energy and power output, and is an important device for reflecting comprehensive utilization and output of gas, electricity, cold and heat. And 10 is a direct current distribution network or a direct current micro-grid or a centralized battery energy storage power station, which is required to be accessed through a direct current converter, is used for simulating equipment with direct current source characteristics in the distribution network, and can be used for simulating bidirectional energy flow between direct current grids or equipment with different types and different voltage levels. And 11 is an alternating-current micro-grid or a regional alternating-current power distribution network, and is used for simulating flexible direct-current interconnection of alternating-current power distribution networks in different regions. 12-1 to 12-4 are adjustable transformers, which can flexibly adjust the voltage transformation ratio and simulate power distribution networks with different voltage classes according to similar principles. And 13 is an intelligent platform area simulation system which is provided with an intelligent distribution transformer terminal and the like based on the internet of things technology, and can simulate various operation characteristics of an intelligent platform area, including three-phase unbalance, harmonic waves, platform area energy efficiency monitoring and the like. 14 is an alternating current grid-connected photovoltaic power generation system, 15 is an alternating current grid-connected vertical axis direct drive wind power generation system, and can be used for researching and analyzing the operation characteristics of alternating current grid-connected distributed photovoltaic and wind power, so that distributed energy sources can be well received.
And 16 is a #1 direct current micro-grid system connected with a direct current bus, and comprises energy storage devices with different types, different characteristics, such as super capacitors, batteries and the like, and distributed photovoltaics, electric automobile charging, direct current loads and the like. 17 is a #2 direct current micro-grid system connected with a direct current bus, which comprises a water electrolysis cell stack except a distributed photovoltaic, a direct current load and a fuel cell, and is used for producing hydrogen by electrolysis, wherein the required energy is derived from redundant energy such as the distributed photovoltaic or energy with low grid connection quality, and the specific reaction formula is as follows: 2H (H) 2 O→2H 2 ↑+O 2 And ∈r, the hydrogen generated by the chemical reaction can be supplied to a fuel cell for power generation or a methanation system for methane production. And 18 is a carbon dioxide capturing device and a methanation system. The methanation reaction is mainly utilized, namely, under the condition of a catalyst and a certain condition, the hydrogen is used for reducing the carbon dioxide to generate methane and water, and the specific reaction formula is as follows: CO 2 +4H 2 →CH 4 ↑+2H 2 And O, the generated methane is used for providing fuel for the micro gas turbine, and the function of combined cooling, heating and power is realized. The two chemical formulas are the basis and core principles of electric conversion to gas, gas conversion to electricity or gas conversion to electricity, cold and hot, and comprehensive and efficient utilization of electricity, gas, cold and hot can be realized through the direct-current micro-grid system, the carbon dioxide capturing device and the methanation system, and the utilization efficiency of energy sources is improved.
19-1 is a first full-control type bidirectional AC/DC converter, 19-2 is a second full-control type bidirectional AC/DC converter, 19-3 is a third full-control type bidirectional AC/DC converter, 19-4 is a fourth full-control type bidirectional AC/DC converter, 20 is a bidirectional DC/DC converter, 21 is a movable grounding short-circuit fault generating unit, and the device can flexibly move, is connected with different electric nodes, and simulates single-phase short-circuit faults or three-phase short-circuit faults at different positions or voltage drop characteristics at different degrees. 22-1 to 22-14 are ac line parameter units, where 22-1 is a first ac line parameter unit, 22-2 is a second ac line parameter unit, and 22-3 is a third ac line parameter unit. The ac line parameter units can be flexibly combined to simulate ac lines of different lengths and different types, such as overhead lines, cabling or hybrid overhead-cabling. 23-1 to 23-5 are DC line parameter units, and can be flexibly combined to simulate DC lines with different lengths and different types. 24-1 to 24-11 are dc circuit breakers for controlling, protecting and switching the operating state of the dc lines. 25-1 to 25-17 are ac breaker switches, 25-18 to 25-29 are ac load switches for controlling, protecting and switching the operating state of the ac line, and disconnection faults of the distribution line can be simulated by remote control of different types of switches. 26-1 to 26-8 are adjustable load units, which can flexibly simulate resistive loads, inductive loads, capacitive loads, resistive inductive loads, resistive capacitive loads, three-phase unbalanced loads and the like with different capacities, and meet the requirements of simulating different load running conditions.
As can be seen from fig. 2, in this embodiment, the physical simulation unit includes an ac/dc hybrid power distribution network topology, a dc micro-grid, a distributed photovoltaic and wind power generation system, a micro gas turbine, a CCHP cogeneration system, a water electrolysis hydrogen production system, a carbon dioxide capturing and methanation system, and the like, which can provide a rich element foundation for simulating the energy internet based on the power distribution network.
With continued reference to fig. 2, one outgoing line of the first infinite system 6 is connected to the first fully-controlled bidirectional AC/DC converter 19-1 via the first AC line parameter unit 22-1 to construct a DC bus of the DC power distribution network, which is the first end module. One outgoing line of the second infinity system 7 is connected with the second full-control bidirectional AC/DC converter 19-2 sequentially through the second AC line parameter unit 22-2 and the third AC line parameter unit 22-3 to form a second end module. The fully-controlled bidirectional AC/DC converter 19-1 and the fully-controlled bidirectional AC/DC converter 19-2 can be used as two ends in a multi-end AC/DC hybrid power distribution network, and can perform bidirectional energy exchange. The micro gas turbine 9 is connected into a DC bus of the power distribution network through a third full-control bidirectional AC/DC converter 19-3 to form a third end module which is also used as one end of the multi-end AC/DC hybrid power distribution network. The AC micro-grid or regional AC distribution network 11 is connected into a DC bus of the distribution network through a fourth full-control bidirectional AC/DC converter 19-4 to form a fourth terminal module, and the fourth terminal module is also used as one end of a multi-terminal AC/DC hybrid distribution network, so that AC interconnection of the AC distribution networks of different regions can be realized, DC interconnection of the AC distribution networks of different regions can be realized, and meanwhile, the method is a flexible and effective mode for flexibly connecting the micro-grid into the distribution network. The direct-current distribution network, the direct-current micro-grid or the centralized battery energy storage power station 10 is connected into a direct-current bus of the distribution network through the bidirectional DC/DC converter 20 to form a fifth end module, and the fifth end module is also used as one end of the multi-end alternating-current and direct-current hybrid distribution network and used for simulating the connection of an energy storage system or the interconnection of the direct-current distribution networks or the direct-current micro-grids with different voltage levels.
In summary, the first fully-controlled bidirectional AC/DC converter 19-1, the second fully-controlled bidirectional AC/DC converter 19-2, the third fully-controlled bidirectional AC/DC converter 19-3, the fourth fully-controlled bidirectional AC/DC converter 19-4 and the bidirectional DC/DC converter 20 form five ends of the AC/DC hybrid power distribution network, which are important interfaces for flexible energy flow, so that the five ends of the AC/DC hybrid power distribution network can be simulated, a grid foundation of an energy internet simulation system is formed, and research on regional energy internet operation modes, boundary characteristics of an AC/DC hybrid system, mathematical description methods of the boundary characteristics of the AC/DC hybrid system, interface power exchange mechanism between the DC system and the AC system, interactive influence dynamic characteristics of faults of the AC/DC hybrid system, micro-grid and micro-grid group flexible access power distribution network and the like are facilitated.
In summary, the physical simulation unit can construct an regional energy internet physical simulation system architecture based on the ac-dc hybrid power distribution network, output a real operation result, and upload an actual wiring topology and an actual operation result of the physical simulation unit to the general monitoring unit; the digital simulation unit can establish a required digital simulation model, set corresponding parameters and interface parameters of the digital-analog connection nodes, and upload wiring topology and simulation calculation results of the digital simulation model to the general monitoring unit. Dynamic data and power exchange is possible by the movable interface unit establishing a connection between the physical analog unit and the digital analog unit. The general monitoring unit can flexibly integrate the wiring topology of the physical simulation unit and the digital simulation unit according to the node connection information, display the simulation model of the whole energy Internet simulation system, divide the physical simulation unit part and the digital simulation unit part through a network, and display the results of the physical simulation unit and the digital simulation unit.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An energy internet simulation system based on a digital-analog hybrid simulation technology, which is characterized by comprising: the system comprises a physical simulation unit, a movable interface unit, a digital simulation unit and a main monitoring unit, wherein the physical simulation unit and the digital simulation unit are connected through the movable interface unit, and the main monitoring unit is respectively connected with the physical simulation unit, the movable interface unit and the digital simulation unit;
the physical simulation unit is used for dynamically simulating the energy Internet based on the intelligent AC/DC hybrid power distribution network;
the movable interface unit is used for performing analog-to-digital conversion, digital-to-analog conversion, data exchange and power exchange between the physical analog unit and the digital analog unit;
the digital simulation unit is used for modeling and simulating a power distribution network, a micro-grid and a comprehensive energy system in the energy internet;
the main monitoring unit is used for monitoring and displaying the physical simulation unit, the movable interface unit and the digital simulation unit;
wherein the physical simulation unit includes: the intelligent AC/DC hybrid power distribution network comprises an intelligent AC/DC hybrid power distribution network rack, an electric energy conversion transmission module and an electric and signal centralized wiring screen cabinet, wherein the electric and signal centralized wiring screen cabinet is connected with a movable interface unit;
the intelligent AC/DC hybrid power distribution network rack is used for simulating a power distribution network substation with a medium-low voltage level and an AC/DC hybrid power distribution network thereof; the electric energy conversion transmission module is used for carrying out distributed storage and transmission of renewable energy sources by utilizing an electric energy conversion technology; the electric and signal centralized wiring screen cabinet is used for integrating an electric interface which can be accessed by the physical simulation unit and an output interface acquired by the physical simulation unit;
the intelligent AC/DC hybrid power distribution network rack comprises: the system comprises a first end module, a second end module, a third end module, a fourth end module and a fifth end module, wherein any two modules from the first end module to the fifth end module can exchange bidirectional energy;
the first end module includes: the first infinite system, the first alternating current line parameter unit and the first full-control bidirectional AC/DC converter are sequentially connected and are used for constructing a direct current bus of the direct current distribution network;
the second end module includes: the second infinite system, the second alternating current line parameter unit, the third alternating current parameter unit and the second full-control bidirectional AC/DC converter are sequentially connected and are used for dynamic power exchange and serve as a standby power interface to construct a direct current bus of the direct current power distribution network;
the third terminal module includes: the miniature gas turbine and the third full-control bidirectional AC/DC converter are connected in sequence and are used for being connected into a direct current bus of the power distribution network and simulating comprehensive utilization and output of gas, electricity, cold and heat;
the fourth end module includes: the system comprises an alternating-current micro-grid, a fourth full-control type bidirectional AC/DC converter and/or a regional alternating-current power distribution network and a fourth full-control type bidirectional AC/DC converter which are sequentially connected, wherein the regional alternating-current power distribution network and the fourth full-control type bidirectional AC/DC converter are used for simulating flexible direct-current interconnection structures of alternating-current power distribution networks in different regions;
the fifth end module includes: the battery energy storage power station and the bidirectional DC/DC converter which are sequentially connected are used for simulating the access of an energy storage system, simulating the interconnection structures of the DC power distribution networks with different voltage levels or simulating the interconnection structures of the DC micro power grids.
2. The energy internet simulation system based on the digital-analog hybrid simulation technology according to claim 1, wherein the first infinity system and the second infinity system are used for simulating different substations or different outgoing lines of the same substation.
3. The energy internet simulation system based on the digital-analog hybrid simulation technology according to claim 1, wherein the movable interface unit comprises: a physical interface and a digital interface;
the physical interface is used for transmitting the data of the digital simulation unit to the physical simulation unit through digital-to-analog conversion;
the digital interface is used for transmitting the data of the physical analog unit to the digital simulation unit through analog-to-digital conversion.
4. The energy internet simulation system based on the digital-analog hybrid simulation technology according to claim 3, wherein the physical interface comprises: a power amplifier or four-quadrant power amplifier with digital-to-analog conversion function, the digital interface comprising: a sensor or a data collector with an analog-to-digital conversion function.
5. The energy internet simulation system based on the digital-analog hybrid simulation technology according to claim 1, wherein the digital simulation unit can perform electromagnetic transient simulation, electromechanical transient simulation and electromechanical-electromagnetic transient simulation.
6. The energy internet simulation system based on the digital-analog hybrid simulation technology according to any one of claims 1 to 5, wherein the general monitoring unit comprises: the device comprises a data acquisition subunit, a controller and a display subunit;
the data acquisition subunit is used for monitoring and acquiring the data of the physical simulation unit, the movable interface unit and the digital simulation unit in real time and transmitting the data to the controller;
the controller is used for analyzing the actual operation data of the physical simulation unit and the calculation result data of the digital simulation unit, obtaining an analysis result and transmitting the data of the data acquisition subunit to the display subunit;
the display subunit is used for uniformly displaying the data of the physical simulation unit, the movable interface unit and the digital simulation unit.
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