CN109814403B - Digital-analog hybrid simulation system for high-density distributed inversion grid connection - Google Patents
Digital-analog hybrid simulation system for high-density distributed inversion grid connection Download PDFInfo
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Abstract
The application relates to a high-density distributed inversion grid-connected digital-analog hybrid simulation system, which comprises: the system comprises a digital simulation subsystem, a physical subsystem, an upper computer monitoring unit and a signal interface unit; the digital simulation subsystem is connected with the physical subsystem through a signal interface unit; the upper computer monitoring unit is used for being connected with the digital simulation subsystem and the physical subsystem through an Ethernet; the signal interface unit is used for realizing control and energy exchange between the digital simulation subsystem and the physical subsystem by controlling the physical subsystem and the digital simulation subsystem.
Description
Technical Field
The application belongs to the key technical field of high-density distributed power inversion, and particularly relates to a digital-analog hybrid simulation system of high-density distributed inversion grid connection.
Background
The distributed renewable energy grid-connected unit has the characteristics of small installed capacity, huge quantity and free and flexible control, but as a large number of distributed power supplies are connected into a power distribution network in a micro-grid mode, a high-density distributed inversion system is formed, and a series of problems such as electric energy quality problems, micro-grid parallel-to-grid switching problems, harmonic resonance problems and the like occur in the micro/power distribution network, so that the access of the high-density distributed inversion system brings new challenges to the operation and control of the power grid. How to construct a real-time simulation system which is suitable for high-density distributed inversion access and has accuracy, effectiveness and flexibility is a necessary premise for researching operation control and fault protection.
The existing real-time simulation system based on the distributed power inversion control technology is mostly in a loop of controllers and a loop of power. The controller is in a loop and is interconnected with a simulation system which is built in a real-time simulation platform and consists of a primary main loop, power hardware and the like by adopting a real physical controller through an IO interface unit, namely, a hardware device of the simulation system is controlled by the real controller, so that the purpose of testing and verifying the functional performance of the real controller is achieved; the power ring is connected to the power grid environment of the simulation system through a four-quadrant power amplifier by adopting a real power whole device. The power amplifier requires high linearity, resolution and accuracy and is expensive, on the other hand, the device for carrying out the power in the loop has smaller power due to the power limitation of the four-quadrant power amplifier.
Disclosure of Invention
In order to solve the problems, the application provides a digital-analog hybrid simulation system for high-density distributed inversion grid connection, which reasonably fuses and controls the digital system and the physical system to realize interactive control of the digital system and the physical system, not only satisfies the functional performance test of a single controller and a single power device, but also satisfies the system operation control research of the high-density distributed inversion grid connection of multi-node access.
The application aims at adopting the following technical scheme:
a high density distributed inversion grid-tie digital-analog hybrid simulation system, the system comprising: the system comprises a digital simulation subsystem, a physical subsystem, an upper computer monitoring unit and a signal interface unit;
the digital simulation subsystem is connected with the physical subsystem through a signal interface unit;
the upper computer monitoring unit is used for being connected with the digital simulation subsystem and the physical subsystem through an Ethernet;
the signal interface unit is used for realizing control and energy exchange between the digital simulation subsystem and the physical subsystem by controlling the physical subsystem and the digital simulation subsystem.
Preferably, the digital simulation subsystem comprises a simulation system controller, a distributed inversion model and a system fault simulation model.
Further, the physical subsystem includes a physical system controller, a single inverter controller, and a plurality of distributed inverter devices.
Further, the signal interface unit includes: a simulation side interface and a physical side interface; wherein,
the simulation side interface is used for converting according to functions contained in the distributed inversion model and the system fault simulation model of the digital simulation subsystem so as to realize control and energy exchange of the physical subsystem to the simulation subsystem;
the physical side interface is used for converting the virtual digital quantity acquired by the simulation side interface into a command for controlling the power component of the physical subsystem so as to realize the control and energy exchange of the digital simulation subsystem to the physical subsystem.
Preferably, the upper computer monitoring unit is composed of a high-performance computer.
Further, an operable human-computer interface module is built in the upper computer monitoring unit and is used for completing the functions of operation mode switching, fault injection setting and experimental data management through the human-computer interface module.
Further, the upper computer monitoring unit further comprises: the system comprises an operation mode switching unit, an experimental data management unit and a fault injection setting unit.
Further, the operation mode switching unit is respectively connected with the simulation system controller and the physical system controller to acquire communication data received and transmitted by the signal interface unit, and is also used for switching based on the selected operation mode and transmitting the communication data to the digital simulation subsystem and the physical subsystem in a mode of operation mode switching instructions;
the experimental data management unit is used for managing the data received by the signal interface unit;
the fault injection setting unit is used for providing fault injection selection, carrying out fault injection based on user selection, and sending the fault injection setting to a system fault simulation model of the digital simulation subsystem in a control instruction mode to carry out corresponding system fault simulation.
Further, user setting of operation mode switching, fault injection and test data management is completed through the human-computer interface module, a control instruction is sent to the real-time simulation unit based on the signal interface unit, and the real-time simulation unit performs operation mode switching, fault injection and test data management based on the control instruction.
Further, the control instruction comprises an operation mode state bit, and when the operation mode state bit is set to 0, the physical subsystem is controlled by a simulation system controller of the digital simulation subsystem;
when the physical subsystem is controlled by a simulation system controller of the digital simulation subsystem, the simulation system controller of the digital simulation subsystem is connected with the physical subsystem through a simulation side interface of the signal interface unit and a physical side interface, and the control of the distributed inversion model of the physical subsystem is executed;
when the running mode status bit is set to 1, the digital simulation subsystem is controlled by a physical system controller of the physical subsystem; when the digital simulation subsystem is controlled by a physical system controller of a physical subsystem, the physical system controller of the physical subsystem is connected with the digital simulation subsystem through a physical side interface of a signal interface unit and a simulation side interface, and the control of a single inverter controller and a plurality of distributed inverter devices of the digital simulation subsystem is executed
Compared with the closest prior art, the application has the following beneficial effects:
the application aims to provide a digital-analog hybrid simulation system for high-density distributed inversion grid connection, which is used for researching a multi-distributed power grid connection inversion system and verifying an operation control strategy of the multi-distributed inversion system. The system comprises: the system comprises a digital simulation subsystem, a physical subsystem, an upper computer monitoring unit and a signal interface unit, wherein the digital simulation subsystem is connected with the physical subsystem through the signal interface unit; the upper computer monitoring unit is connected with the digital simulation subsystem and the physical subsystem through Ethernet; the simulation system comprising the mutual control of the digital system and the physical system is constructed, so that the data sharing and the mixed control of the physical system and the simulation system of the distributed power generation/distributed power generation grid-connected unit can be realized, and the synchronous operation of the physical system and the simulation system can be realized, thereby greatly improving the accuracy and the effectiveness of the real-time simulation system.
The upper computer monitoring unit is used for being connected with the digital simulation subsystem and the physical subsystem through an Ethernet; and the signal interface unit is used for realizing control and energy exchange between the digital simulation subsystem and the physical subsystem by controlling the physical subsystem and the digital simulation subsystem. And the system control protection strategy and hardware are comprehensively, accurately and effectively verified and tested by taking the advantages of the two systems into consideration. When the simulation subsystem controls the physical subsystem, the optimization of the control strategy and the protection principle can be performed; when the physical subsystem controls the simulation subsystem, the functional performance of the hardware controller can be verified, and meanwhile, the control of the high-density distributed inversion system can be realized.
Drawings
FIG. 1 is a schematic diagram of a digital-analog hybrid simulation system for high-density distributed inversion grid connection provided in an embodiment of the present application;
fig. 2 is a schematic diagram of the high-density distributed inversion system provided in an embodiment of the present application.
Detailed Description
The present application will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and the description are for the purpose of illustrating the application only and are not to be construed as limiting the application.
The application aims to provide a digital-analog hybrid simulation system for high-density distributed inversion grid connection, which is used for researching a multi-distributed power grid connection inversion system and verifying an operation control strategy of the multi-distributed inversion system, and is used for constructing a real-time simulation system which can mutually control a digital system and a physical system, realizing data sharing and hybrid control of the physical system and the simulation system of a distributed power generation/distributed power generation grid connection unit and synchronous operation of the physical system and the simulation system, and greatly improving the accuracy and the effectiveness of the real-time simulation system.
As shown in fig. 1, the system includes: the system comprises a digital simulation subsystem, a physical subsystem, an upper computer monitoring unit and a signal interface unit, wherein the digital simulation subsystem is connected with the physical subsystem through the signal interface unit; the upper computer monitoring unit is connected with the digital simulation subsystem and the physical subsystem through Ethernet; wherein,
the digital simulation subsystem is connected with the physical subsystem through a signal interface unit;
the upper computer monitoring unit is used for being connected with the digital simulation subsystem and the physical subsystem through an Ethernet;
and the signal interface unit is used for realizing control and energy exchange between the digital simulation subsystem and the physical subsystem by controlling the physical subsystem and the digital simulation subsystem.
In addition, the digital simulation subsystem includes a simulation system controller, a distributed inversion model, and a system fault simulation model. The physical subsystem includes a physical system controller, a single inverter controller, and a plurality of distributed inverter devices. Based on the upper computer monitoring unit, system faults (short circuit, open phase and grounding) are set from the system fault simulation model, the control behavior of the high-density distributed inverter system controller in an abnormal state of the power grid system is verified, and the effectiveness and flexibility of the digital-analog hybrid real-time simulation system are enhanced.
The signal interface unit includes: a simulation side interface and a physical side interface; wherein,
the simulation side interface is used for receiving physical side interface signals (analog quantity, digital quantity and communication data), and converting according to functions contained in a distributed inversion model and a system fault simulation model of the digital simulation subsystem so as to realize control and energy exchange of the physical subsystem to the simulation subsystem;
the physical interface is used for receiving information of the simulation side interface, and converting virtual digital quantity acquired by the simulation side interface into a command for controlling a power component of the physical subsystem so as to realize control and energy exchange of the digital simulation subsystem to the physical subsystem.
Further, an operable human-computer interface module is built in the upper computer monitoring unit and is used for completing the functions of operation mode switching, fault injection setting and experimental data management through the human-computer interface module. In addition, the upper computer monitoring unit further comprises: the system comprises an operation mode switching unit, an experimental data management unit and a fault injection setting unit.
The operation mode switching unit is respectively connected with the simulation system controller and the physical system controller to acquire communication data received and transmitted by the signal interface unit, and is also used for switching based on the selected operation mode and transmitting the communication data to the digital simulation subsystem and the physical subsystem in a mode of an operation mode switching instruction;
the experimental data management unit is used for managing the data received by the signal interface unit;
the fault injection setting unit is used for providing fault injection selection, carrying out fault injection based on user selection, and sending the fault injection setting to a system fault simulation model of the digital simulation subsystem in a control instruction mode to carry out corresponding system fault simulation.
User setting of operation mode switching, fault injection and test data management is completed through the human-computer interface module, a control instruction is sent to the real-time simulation unit based on the signal interface unit, and the real-time simulation unit performs operation mode switching, fault injection and test data management based on the control instruction.
The control instruction comprises an operation mode state bit, and when the operation mode state bit is set to 0, the physical subsystem is controlled by a simulation system controller of the digital simulation subsystem;
when the physical subsystem is controlled by a simulation system controller of the digital simulation subsystem, the simulation system controller of the digital simulation subsystem is connected with the physical subsystem through a simulation side interface of the signal interface unit and a physical side interface, and the control of the distributed inversion model of the physical subsystem is executed;
when the running mode status bit is set to 1, the digital simulation subsystem is controlled by a physical system controller of the physical subsystem; when the digital simulation subsystem is controlled by a physical system controller of the physical subsystem, the physical system controller of the physical subsystem is connected with the digital simulation subsystem through a physical side interface of the signal interface unit and a simulation side interface, and the control of a single inverter controller and a plurality of distributed inverter devices of the digital simulation subsystem is executed.
The fault injection setting function is realized by monitoring the downstream communication from the upper computer unit to the simulation subsystem. The fault injection setting function completes the power grid fault enabling function of the digital real-time simulation system, and the power grid of the real-time simulation unit has no related fault before related fault enabling. The related fault enabling list is as follows, each fault is designed as a command module in the upper computer monitoring unit, and can be converted into a 16-bit command word Contrlword by setting the numerical value enabling of '1' or '0', and the 16-bit command word Contrlword is sent to the real-time simulation unit through Ethernet communication.
| Fault type | Enable settings | Prohibition of the set value |
| Single phase via resistance ground fault | 1 | 0 |
| Near end two-phase short circuit fault | 1 | 0 |
| Remote two-phase short circuit fault | 1 | 0 |
| Three-phase system voltage unbalance degree setting (%) | 0～64 | 0 |
| Grid voltage harmonic distortion rate setting (%) | 0～64 | 0 |
Meaning table for each bit of 16-bit command word Contrlword
Examples:
as shown in fig. 2, the present embodiment includes: the system comprises four parts, namely a simulation subsystem, a physical subsystem, a signal interface unit and an upper computer monitoring unit. The simulation subsystem and the physical subsystem are connected through a signal interface unit, and three modes of digital I/O, analog I/O and communication are adopted.
And setting control modes of the two systems through an operation mode switching module of the upper computer monitoring unit. When the simulation system is set to be 0, a system controller (called a simulation system controller for short) of the simulation subsystem is connected with the physical subsystem through a simulation side interface of the signal interface unit and a physical side interface to control the physical subsystem; when the system is set to be 1, a system controller (called a physical system controller for short) of the physical subsystem is connected with the simulation subsystem through a simulation side interface of the signal interface unit to control the simulation subsystem.
The simulation subsystem and the physical subsystem perform data interaction through a communication component of the signal interface unit, and all data of the two systems are transmitted to the upper computer monitoring system through the Ethernet.
The upper computer monitoring system can set fault injection setting, so that the corresponding system fault simulation of the simulation subsystem is enabled.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application and not for limiting the scope of protection thereof, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: various alterations, modifications, and equivalents may occur to others skilled in the art upon reading the present disclosure, and are within the scope of the appended claims.
Claims (5)
1. A high-density distributed inversion grid-connected digital-analog hybrid simulation system, the system comprising: the system comprises a digital simulation subsystem, a physical subsystem, an upper computer monitoring unit and a signal interface unit;
the digital simulation subsystem is connected with the physical subsystem through a signal interface unit;
the upper computer monitoring unit is used for being connected with the digital simulation subsystem and the physical subsystem through an Ethernet;
the signal interface unit is used for realizing control and energy exchange between the digital simulation subsystem and the physical subsystem by controlling the physical subsystem and the digital simulation subsystem;
an operable human-computer interface module is arranged in the upper computer monitoring unit and is used for completing the functions of operation mode switching, fault injection setting and experimental data management through the human-computer interface module;
the upper computer monitoring unit further comprises: the system comprises an operation mode switching unit, an experimental data management unit and a fault injection setting unit;
the operation mode switching unit is respectively connected with the simulation system controller and the physical system controller to acquire communication data received and transmitted by the signal interface unit, is also used for switching based on the selected operation mode and transmitting the communication data to the digital simulation subsystem and the physical subsystem in a mode of operation mode switching instructions;
the experimental data management unit is used for managing the data received by the signal interface unit;
the fault injection setting unit is used for providing fault injection selection, carrying out fault injection based on user selection, and sending the fault injection setting to a system fault simulation model of the digital simulation subsystem in a control instruction mode to carry out corresponding system fault simulation;
user setting of operation mode switching, fault injection and test data management is completed through the human-computer interface module, a control instruction is sent to the real-time simulation unit based on the signal interface unit, and the real-time simulation unit performs operation mode switching, fault injection and test data management based on the control instruction;
the control instruction comprises an operation mode state bit, and when the operation mode state bit is set to 0, the physical subsystem is controlled by a simulation system controller of the digital simulation subsystem;
when the physical subsystem is controlled by a simulation system controller of the digital simulation subsystem, the simulation system controller of the digital simulation subsystem is connected with the physical subsystem through a simulation side interface of the signal interface unit and a physical side interface, and the control of the distributed inversion model of the physical subsystem is executed;
when the running mode status bit is set to 1, the digital simulation subsystem is controlled by a physical system controller of the physical subsystem; when the digital simulation subsystem is controlled by a physical system controller of the physical subsystem, the physical system controller of the physical subsystem is connected with the digital simulation subsystem through a physical side interface of the signal interface unit and a simulation side interface, and the control of a single inverter controller and a plurality of distributed inverter devices of the digital simulation subsystem is executed.
2. The system of claim 1, wherein the digital simulation subsystem comprises a simulation system controller, a distributed inversion model, and a system fault simulation model.
3. The system of claim 1, wherein the physical subsystem comprises a physical system controller, a single inverter controller, and a plurality of distributed inverters.
4. A system according to claim 3, wherein the signal interface unit comprises: a simulation side interface and a physical side interface; wherein,
the simulation side interface is used for converting according to functions contained in the distributed inversion model and the system fault simulation model of the digital simulation subsystem so as to realize control and energy exchange of the physical subsystem to the simulation subsystem;
the physical side interface is used for converting the virtual digital quantity acquired by the simulation side interface into a command for controlling the power component of the physical subsystem so as to realize the control and energy exchange of the digital simulation subsystem to the physical subsystem.
5. The system of claim 1, wherein the upper computer monitor unit is comprised of a high performance computer.
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