A distributed inverter real-time simulation system with mirror detection

Abstract

The present invention relates to a distributed inverter real-time simulation system with mirror detection, the system comprising: a real distributed inverter system, a mirror distributed inverter simulation system, and a signal interface unit; the real distributed inverter system and the mirror distributed inverter simulation system are connected in communication via the signal interface unit; the present invention adopts a mirror detection method to transmit the data of a real power device with unlimited capacity to a corresponding device of the simulation system to perform real operation data fitting; the power grid system of the simulation system can simulate common faults and abnormal states of the real power grid as required, and simultaneously control the distributed inverter system of the simulation system and the real distributed inverter system of the physical environment through a real controller. It has the advantages of data mirroring, data replication, and synchronous operation between physical equipment and simulation system, and has very important application value and good development prospects.

Description

[Technical field]

[0001] The invention belongs to the technical field of distributed power supply inverter control, and in particular relates to a distributed inverter real-time simulation system with mirror detection. [Background technology]

[0002] Distributed renewable energy grid-connected units have the characteristics of small single installed capacity, large number, and free and flexible control. However, as distributed power generation access to smart grids has entered a new development stage in my country, distributed inverter systems have brought new challenges to the operation and control of power grids. How to ensure that distributed power generation is connected to the grid in an orderly, flexible and friendly manner, and to achieve friendly coordination and efficient consumption of distributed energy and power grids has become a major scientific proposition in the field of energy and power grids. At present, in the research related to distributed energy access to the grid, simulation technology is an essential means for the research and verification of operation control and fault protection strategies. In view of the characteristics of small capacity, large number and flexible control of distributed power sources, there is a large deviation between the existing simulation research and the actual experimental research. In order to better improve the scientificity, accuracy and effectiveness of the existing simulation system, it is closely combined with the control method and strategy. Therefore, a new distributed inverter real-time simulation system with mirror detection is urgently needed. The present invention adopts a mirror detection method to transmit the data of the real power device with unlimited capacity to the corresponding device of the simulation system to fit the real operation data; the power grid system of the simulation system can simulate the common faults and abnormal conditions of the real power grid as required, and control the distributed inverter system of the simulation system and the real distributed inverter system of the physical environment through the real controller at the same time. It has the advantages of data mirroring, data replication, and synchronous operation between physical equipment and simulation systems, and has very important application value and good development prospects. [Summary of the invention]

[0003] In order to solve the above problems in the prior art, the present invention proposes a distributed inverter real-time simulation system with mirror detection, which includes: a real distributed inverter system, a mirror distributed inverter simulation system, and a signal interface unit; the real distributed inverter system and the mirror distributed inverter simulation system are communicatively connected via the signal interface unit;

[0004] It also includes a measured control protection device, which is arranged as a controller between the real distributed inverter system and the signal interface unit; so that the real distributed inverter system and the mirror distributed inverter simulation system share a set of controllers; the measured control protection device obtains the control instructions sent by the mirror distributed inverter simulation system to control the real distributed inverter system; and is also used to collect data of the real distributed inverter system for the synchronization setting of the mirror distributed inverter simulation system.

[0005] Furthermore, the communication connection is performed through digital I / O or analog I / O.

[0006] Furthermore, the control instruction is an operation mode switching instruction and a fault injection instruction.

[0007] Furthermore, the control and protection device under test is also used to send measurement instructions to the real distributed inverter system and the mirror distributed inverter simulation system to collect operating status data of the real distributed inverter system and the mirror distributed inverter simulation system, and perform synchronous operation between the two based on the operating status data.

[0008] Furthermore, the synchronization setting is specifically: voltage synchronization and current synchronization between the real distributed inverter system and the mirror distributed inverter simulation system.

[0009] Furthermore, the voltage synchronization between the real distributed inverter system and the mirror distributed inverter simulation system is specifically as follows: the measured control protection device collects the operating data of the real distributed inverter system and the mirror distributed inverter simulation system based on the measurement instruction, and verifies the operating data; if the absolute value of the difference between the operating data of the two at the same time point is greater than the rated voltage and rated current of the real distributed inverter system by more than the first percentage threshold, the operating data at the same time point in the mirror distributed inverter simulation system is replaced by the corresponding operating data at the same time point in the real distributed inverter system, so that the operating data in the mirror distributed inverter simulation system is closer to the data of the real distributed inverter system; the mirror distributed inverter simulation system performs real-time verification according to the operating data fed back by the real distributed inverter system, so that the operating data of the equipment in the simulation system is closer to the real distributed inverter system.

[0010] Furthermore, the first percentage threshold is 3%.

[0011] Furthermore, the mirror distributed inverter simulation system can run independently or synchronously with the real distributed inverter system.

[0012] Furthermore, when operating independently, the mirror distributed inverter simulation system executes a first predetermined time period based on current data, and after the first predetermined time period ends, the operating data of the mirror distributed inverter simulation system and the operating data of the real distributed inverter system are verified to align the simulation model of the mirror distributed inverter simulation system.

[0013] Furthermore, the first predetermined time period is greater than the time interval of the real-time verification.

[0014] The beneficial effects of the present invention include: using the mirror detection method, the data of the real power device with unlimited capacity is transmitted to the corresponding device of the simulation system to fit the real operation data; the power grid system of the simulation system can simulate the common faults and abnormal conditions of the real power grid according to the requirements, and control the distributed inverter system of the simulation system and the real distributed inverter system of the physical environment through the real controller at the same time. It has the advantages of data mirroring, data replication and synchronous operation of physical equipment and simulation system, and has very important application value and good development prospects.

Brief Description of the Drawings

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application, but do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 It is a structural schematic diagram of the distributed inverter real-time simulation system for mirror detection of the present invention.

[0017] Figure 2 It is a structural diagram of a distributed inverter real-time simulation system for mirror detection according to an embodiment of the present invention. [Specific implementation method]

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, wherein the illustrative embodiments and descriptions are only used to explain the present invention but are not intended to limit the present invention.

[0019] like Figure 1 As shown, a distributed inverter real-time simulation system for mirror detection used in the present invention is described in detail, the system comprises: a real distributed inverter system, a mirror distributed inverter simulation system, and a signal interface unit; the real distributed inverter system and the mirror distributed inverter simulation system are communicatively connected via the signal interface unit;

[0020] Preferably: the communication connection is carried out through digital I / O or analog I / O;

[0021] It also includes a control protection device under test, which is arranged as a controller between the real distributed inverter system and the signal interface unit; so that the real distributed inverter system and the mirror distributed inverter simulation system share a set of controllers; the control protection device under test obtains the control instructions sent by the mirror distributed inverter simulation system to control the real distributed inverter system; and is also used to collect data of the real distributed inverter system for synchronization setting of the mirror distributed inverter simulation system;

[0022] Preferably: the control instruction is an operation mode switching instruction and a fault injection instruction;

[0023] Preferably: the control protection device under test is also used to send measurement instructions to the real distributed inverter system and the mirror distributed inverter simulation system to collect operating status data of the real distributed inverter system and the mirror distributed inverter simulation system, and perform synchronous operation between the two based on the operating status data;

[0024] The synchronization setting specifically includes: voltage synchronization and current synchronization between the real distributed inverter system and the mirror distributed inverter simulation system;

[0025] The voltage synchronization between the real distributed inverter system and the mirror distributed inverter simulation system is specifically as follows: the measured control protection device collects the operating data of the real distributed inverter system and the mirror distributed inverter simulation system based on the measurement instruction, and verifies the operating data; if the absolute value of the difference between the operating data of the two at the same time point is greater than the rated voltage and rated current of the real distributed inverter system by more than the first percentage threshold, the operating data at the same time point in the mirror distributed inverter simulation system is replaced by the operating data at the same time point corresponding to the real distributed inverter system, so that the operating data in the mirror distributed inverter simulation system is closer to the data of the real distributed inverter system; the mirror distributed inverter simulation system performs real-time verification according to the operating data fed back by the real distributed inverter system, so that the operating data of the equipment in the simulation system is closer to the real distributed inverter system;

[0026] Preferably: the first percentage threshold is 3%;

[0027] Preferably: the mirror distributed inverter simulation system can run independently or synchronously with the real distributed inverter system; when running independently, the mirror distributed inverter simulation system executes a first predetermined time period based on current data, and after the first predetermined time period ends, the operating data of the mirror distributed inverter simulation system and the operating data of the real distributed inverter system are checked to align the simulation model of the mirror distributed inverter simulation system;

[0028] Preferably, the first predetermined time period is greater than the time interval of the real-time verification; through long-term simulation operation, it is easy to find the substantial gap between the simulation system and the real system, which is convenient for verifying the simulation system model, thereby ensuring the stability of the model in the long term;

[0029] Preferably: the mirror distributed inverter simulation system can perform fault (short circuit, phase loss, grounding) injection, thereby verifying the control behavior of the tested control protection device under abnormal conditions of the power grid system, and then obtaining the real operation data of the real physical system, and then fitting the operation data of the mirror distributed inverter simulation system, and finally making the simulation environment system closer to the real physical environment system, and enhancing the effectiveness and accuracy of the real-time simulation data;

[0030] The control protection device under test is used to collect voltage, current and switch signals of the real distributed inverter system and the mirror distributed inverter simulation system, and simultaneously control the primary equipment in the real distributed inverter system and the mirror distributed inverter simulation system based on the collected data;

[0031] Preferably: the primary equipment is a converter, an inverter, an isolating switch, etc.;

[0032] Preferably: the mirror distributed inverter simulation system can actively initiate fault correction control; specifically: after the mirror distributed inverter simulation system sets a "fault injection" signal, after the tested control protection device receives the "fault injection" signal, fault correction control is performed on the devices in the real distributed inverter system and the mirror distributed inverter simulation system at the same time;

[0033] Preferably: the voltage, current and other operating data in the real distributed inverter simulation system are transmitted to the mirror distributed inverter simulation system through digital I / O or analog I / O communication;

[0034] like Figure 2 As shown, a distributed inverter real-time simulation system for mirror detection according to another embodiment of the present invention is described in detail, the system comprising: a distributed inverter real-time simulation system and a real physical system, the distributed inverter real-time simulation system and the real physical system are communicated and interconnected; wherein: the distributed inverter real-time simulation system comprises a monitoring host computer unit, a signal interface unit, and a real-time simulation unit;

[0035] The real physical system includes a real controller and a distributed real-time inverter system; the distributed real-time inverter system realizes synchronous operation with the real physical system through the real controller.

[0036] Preferably: the distributed inverter real-time simulation system is a mirror simulation system corresponding to the real physical system; the configuration of the distributed inverter real-time simulation system is exactly the same as that of the real physical system; wherein: the real physical system is a distributed photovoltaic / distributed energy storage grid-connected real system;

[0037] The monitoring host computer unit is composed of a high-performance computer; an operable human-machine interface module is built in the monitoring host computer unit, and the user completes the operation mode switching, fault injection setting, and experimental data management functions through the human-machine interface module; the monitoring host computer unit is connected to the real-time simulation unit via Ethernet;

[0038] The monitoring host computer unit includes an interface configuration unit, an experimental data management unit and a fault injection setting unit; the interface configuration unit is connected to the signal interface unit to directly obtain the data obtained and sent by the signal interface unit; the experimental data management unit is used to manage the data received by the signal interface unit; the fault injection setting is used to provide fault injection selection, and perform fault injection based on user selection, send the fault injection setting to the real-time simulation unit by means of control instructions, and also to switch the operation mode based on user selection, and send it to the real-time simulation unit by means of operation mode switching instructions;

[0039] Preferably: the user completes the user settings of the operation mode switching and fault injection through the human-machine interface module, sends the control instruction to the real-time simulation unit based on the user settings, and the real-time simulation unit performs the operation mode switching and fault injection based on the control instruction;

[0040] Preferably: the control instruction includes an operation mode status bit, when the operation mode status bit is set to 0, the system of the real-time simulation unit is controlled by the real-time simulation controller of the real-time simulation unit; when it is set to 1, the system of the real-time simulation unit is controlled by the real controller of the real physical unit;

[0041] Preferably: the fault injection setting function completes the power grid fault enabling function of the real-time simulation unit, and before the relevant fault is enabled, the power grid of the real-time simulation unit has no relevant fault;

[0042] Preferably: the control instruction includes a fault enable status bit, which is enabled by setting the fault enable status bit to "1" or other "non-0" values; the fault enable status bit is 1 or more bits;

[0043] The fault types include single-phase resistance grounding fault, near-end two-phase short-circuit fault, far-end two-phase short-circuit fault, three-phase system voltage imbalance, etc.

[0044] The signal interface unit communicates with the distributed inverter real-time simulation system and the real physical system through optical fiber / communication cable in serial / parallel communication mode, completes the input, output and collection of operating data of the two systems, and realizes data interaction between the distributed inverter real-time simulation system and the real physical system;

[0045] Preferably: the control pulse synchronization signal is transmitted through the real controller and the simulation controller, so that the distributed inverter real-time simulation system and the real physical system run synchronously;

[0046] The real-time simulation unit is a lower computer system, which is implemented by a real-time simulation machine (for example, RTDS / RTlab / Typhoon, etc.) to provide a real-time simulation running environment; by building a simulation system with the same configuration as the real physical system, the real-time simulation system can be mirrored with the real physical system;

[0047] The real-time simulation system comprises a simulation controller and a hardware interface driver; the simulation controller simulates the real physical system by the same configuration and simulation operation; the hardware interface driver is used to receive data sent from the signal interface unit and send data to the signal interface unit;

[0048] The signal interface unit includes a digital IO interface, an analog IO interface and a communication interface; the digital IO interface, the analog IO interface and the communication interface are all connected to the hardware interface driver; the digital IO interface, the analog IO interface and the communication interface in the signal interface unit are respectively connected to the digital IO interface, the analog IO interface and the communication interface in the real physical system for data communication; all data from the real physical system enters the real-time simulation unit after passing through the signal access unit; the real-time signal interface unit is provided with a hardware security defense mechanism, which can perform security defense on the data from the real physical system;

[0049] Preferably: when the operation data of the real physical system is abnormal, the real controller sends the abnormal information to the monitoring host computer unit for abnormal reporting;

[0050] In the several embodiments provided by the present invention, it should be understood that the disclosed methods and terminals can be implemented in other ways. For example, the device embodiments described above are only illustrative, for example, the division of the modules is only a logical function division, and there may be other division methods in actual implementation.

[0051] In addition, the technical solutions in the above embodiments may be combined and replaced with each other without any contradiction.

[0052] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0053] In addition, each functional module in each embodiment of the present invention may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional modules.

[0054] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any accompanying figure mark in the claims should not be regarded as limiting the claims involved. In addition, it is obvious that the word "comprising" does not exclude other units or steps, and the singular does not exclude the plural. Multiple modules or devices stated in the system claim can also be implemented by one module or device through software or hardware. The words first, second, etc. are used to indicate names, and do not indicate any particular order.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A distributed inverter real-time simulation system with mirror detection, characterized in that: The system comprises: a real distributed inverter system, a mirror image distributed inverter simulation system, and a signal interface unit; the real distributed inverter system and the mirror image distributed inverter simulation system are communicatively connected via the signal interface unit; The system also includes a control protection device under test, which is arranged as a controller between the real distributed inverter system and the signal interface unit, so that the real distributed inverter system and the mirror distributed inverter simulation system share a set of controllers; the control protection device under test obtains the control instructions sent by the mirror distributed inverter simulation system to control the real distributed inverter system; and is also used to collect data of the real distributed inverter system for synchronization setting of the mirror distributed inverter simulation system; The control instructions are operation mode switching instructions and fault injection instructions; The synchronization setting specifically includes: voltage synchronization and current synchronization between the real distributed inverter system and the mirror distributed inverter simulation system; The voltage synchronization between the real distributed inverter system and the mirror distributed inverter simulation system is specifically as follows: the measured control protection device collects the operating data of the real distributed inverter system and the mirror distributed inverter simulation system based on the measurement instruction, and verifies the operating data; if the absolute value of the difference between the operating data of the two at the same time point is greater than the first percentage threshold of the rated voltage or the first percentage threshold of the rated current of the real distributed inverter system, the operating data at the same time point in the mirror distributed inverter simulation system is replaced by the corresponding operating data at the same time point in the real distributed inverter system, so that the operating data in the mirror distributed inverter simulation system is closer to the data of the real distributed inverter system; the mirror distributed inverter simulation system performs real-time verification according to the operating data fed back by the real distributed inverter system, so that the operating data of the equipment in the simulation system is closer to the real distributed inverter system.

2. The distributed inverter real-time simulation system for mirror detection according to claim 1 is characterized in that: The communication connection is performed through digital I / O or analog I / O.

3. The distributed inverter real-time simulation system for mirror detection according to claim 1 is characterized in that: The control protection device under test is also used to send measurement instructions to the real distributed inverter system and the mirror distributed inverter simulation system to collect operating status data of the real distributed inverter system and the mirror distributed inverter simulation system, and perform synchronous operation between the two based on the operating status data.

4. The distributed inverter real-time simulation system for mirror detection according to claim 1, characterized in that: The first percentage threshold is 3%.

5. The distributed inverter real-time simulation system for mirror detection according to claim 4 is characterized in that: The mirror image distributed inverter simulation system can run independently or synchronously with the real distributed inverter system.

6. The distributed inverter real-time simulation system for mirror detection according to claim 5, characterized in that: When operating independently, the mirror distributed inverter simulation system executes measurement instructions based on current data in a first predetermined time period, and after the first predetermined time period ends, the operating data of the mirror distributed inverter simulation system and the operating data of the real distributed inverter system are calibrated to adjust the simulation model of the mirror distributed inverter simulation system.

7. The distributed inverter real-time simulation system for mirror detection according to claim 6, characterized in that: The first predetermined time period is greater than the time interval of the real-time verification.

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