A simulation test platform for a DC transformer

Abstract

The present application discloses a simulation test platform for a DC transformer, comprising: a real-time simulator, a data acquisition device, a control and protection device, and an interface conversion device; the control and protection device is configured to output a control instruction to the interface conversion device; the real-time simulator is configured to obtain the control instruction from the interface conversion device and, according to the control instruction, run the built DC transformer simulation model; the data acquisition device is configured to obtain the output signal when running the control instruction from the real-time simulator through the interface conversion device and send the output signal to the control and protection device; the control and protection device is further configured to generate a new control instruction based on the output signal. It solves the technical problems that when performing real-time simulation tests on existing DC transformers, a large amount of input and output interface resources are required, and a large amount of hard wiring work easily leads to wiring chaos and errors, and it is not easy to detect.

Description

Technical Field

[0001] This application relates to the field of real-time simulation technology, and particularly to a simulation test platform for a DC transformer. Background Art

[0002] With the development of simulation technology, real-time simulation technology has been widely applied in the manufacturing industry, the aerospace field, and the energy and power industry. In the initial stage of power system construction, it is necessary to simulate and model the equipment and control logic in the power system to simulate various operating conditions after the power system is put into operation, so as to find manufacturing and design defects in advance to avoid major safety accidents caused by various defects after completion. Therefore, real-time simulation technology is particularly important.

[0003] When conducting real-time simulation tests on DC transformers, a large number of analog signals and digital output interfaces are required, and a large amount of hard wiring is used to upload a huge amount of analog signals and digital quantities from the real-time simulator. In this way, a large amount of input and output interface resources are required, and a large amount of hard wiring work is prone to wiring chaos and errors, and it is not easy to detect. Summary of the Invention

[0004] In view of this, this application provides a simulation test platform for a DC transformer, which solves the technical problems that when conducting real-time simulation tests on existing DC transformers, a large amount of input and output interface resources are required, and a large amount of hard wiring work is prone to wiring chaos and errors, and it is not easy to detect.

[0005] The first aspect of this application provides a simulation test platform for a DC transformer, including: a real-time simulator, a data acquisition device, a control and protection device, and an interface conversion device;

[0006] The control and protection device is used to output a control instruction to the interface conversion device;

[0007] The real-time simulator is used to obtain the control instruction from the interface conversion device and run the built DC transformer simulation model according to the control instruction;

[0008] The data acquisition device is used to obtain the output signal when running the control instruction from the real-time simulator through the interface conversion device and send the output signal to the control and protection device;

[0009] The control and protection device is further used to generate a new control instruction based on the output signal.

[0010] Optionally, the interface conversion device includes: a first interface, a second interface, and a third interface;

[0011] The first interface is the communication interface between the interface conversion device and the real-time simulator;

[0012] The second interface is the communication interface between the interface conversion device and the data acquisition device;

[0013] The third interface is the communication interface between the interface conversion device and the control and protection device.

[0014] Optionally, the first interface is an optical fiber interface;

[0015] The output signals include analog signals and digital signals.

[0016] Optionally, the communication protocol corresponding to the optical fiber interface is the aurora protocol.

[0017] Optionally, the second interface is an FT3 interface;

[0018] The FT3 interface is used to transmit the analog signals in the output signals.

[0019] Optionally, the third interface includes: an intranet interface 1, an intranet interface 2, and a GOOSE network interface;

[0020] The intranet interface 1 is used to send the digital signals in the output signals to the intranet interface 2;

[0021] The intranet interface 2 is used to send the digital signals to the GOOSE network interface;

[0022] The GOOSE network interface is used to send the digital signals to the control and protection device; it is also used to receive the control commands sent by the control and protection device;

[0023] The intranet interface 2 is also used to send the control commands to the intranet interface 1;

[0024] The intranet interface 1 is also used to send the control commands to the real-time simulator through the first interface.

[0025] Optionally, the data acquisition device includes: an all-optical fiber current transformer.

[0026] Optionally, it further includes: a waveform recording subsystem;

[0027] The waveform recording subsystem is connected to the data acquisition device and is used to record the analog signals in the output signals.

[0028] It can be seen from the above technical solutions that the present application has the following advantages:

[0029] The present application provides a simulation test platform for a DC transformer, including: a real-time simulator, a data acquisition device, a control and protection device, and an interface conversion device; the control and protection device is used to output a control instruction to the interface conversion device; the real-time simulator is used to obtain the control instruction from the interface conversion device and, according to the control instruction, run the built DC transformer simulation model; the data acquisition device is used to obtain the output signal when running the control instruction from the real-time simulator through the interface conversion device and send the output signal to the control and protection device; the control and protection device is further used to generate a new control instruction based on the output signal.

[0030] In the present application, an interface conversion device is designed, and then data transfer is realized among the control and protection device, the real-time simulator, and the data acquisition device by using this interface conversion device. By using the interface conversion device, a large number of hard wires are avoided to send the analog signals and digital signals of the DC transformer model, solving the technical problems that when the existing DC transformer conducts real-time simulation tests, a large number of input and output interface resources are required, and a large amount of hard wiring work easily leads to wiring chaos and errors, and it is not easy to detect. Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 It is a schematic structural diagram of an embodiment of a simulation test platform for a DC transformer in an embodiment of the present application. Detailed Embodiments

[0033] The embodiment of the present application provides a simulation test platform for a DC transformer, solving the technical problems that when the existing DC transformer conducts real-time simulation tests, a large number of input and output interface resources are required, and a large amount of hard wiring work easily leads to wiring chaos and errors, and it is not easy to detect.

[0034] In order to enable those skilled in the art to better understand the solution of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0035] The first aspect of the embodiment of the present application provides an embodiment of a simulation test platform for a DC transformer.

[0036] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of a simulation test platform for a DC transformer in an embodiment of this application.

[0037] The simulation test platform for the DC transformer in this embodiment includes: a real-time simulator, a data acquisition device, a control and protection device, and an interface conversion device; the control and protection device is used to output control instructions to the interface conversion device; the real-time simulator is used to obtain control instructions from the interface conversion device and run the built DC transformer simulation model according to the control instructions; the data acquisition device is used to obtain the output signal when running the control instruction from the real-time simulator through the interface conversion device and send the output signal to the control and protection device; the control and protection device is further used to generate new control instructions based on the output signal.

[0038] The control and protection device in this embodiment communicates with the SCADA through an electric Ethernet dual-network link, is connected to the data acquisition device through a gigabit Ethernet, and receives the data volume sent by the data acquisition device. At the same time, through the connection of the interface conversion device, it collects the valve control upstream analog signal and switch status digital signal sent by the real-time simulator, and issues digital signals such as frequency modulation signals, so as to realize the corresponding control of the AC series switch and disconnecting switch. The main functions of the control and protection device are realized by the DSP program and the visualization program. The calculation period of the DSP program can be as low as 100 us, and it mainly completes functions such as active power control, reactive power control, DC voltage control, phase-locked loop control, and inner-loop current control; the calculation period of the visualization program is at least 1 ms, with an intuitive interface, convenient debugging, and easy monitoring, and it mainly realizes the sequential control and corresponding protection functions of the flexible DC unit.

[0039] The data acquisition device in this embodiment is used as a slave to be used in supporting the control and protection device host to realize the acquisition and upload of analog signals. This unit is equipped with a high-speed and reliable electric Ethernet interface to realize the interface with the substation automation system and the protection information management system. The analog signal acquisition unit supports the mixed sampling of up to 48 channels of conventional analog signals and 48 channels of MU analog signals, and uploads the original sampling data to the control host through the gigabit optical ports 1 and 2 of the CPU board.

[0040] The real-time simulator in this embodiment is a computer installed with real-time simulation software. Through this computer, a DC transformer simulation model can be built in real time and the DC transformer simulation model can be run. When specifically building, a corresponding DC transformer simulation model is built according to the specifications and working scenarios of the DC transformer.

[0041] In this embodiment, the interface conversion device interacts with the data acquisition device and the control and protection device to exchange analog signals, digital signals, and control commands upward, and can interact with the real-time simulator to exchange analog signals, digital signals, valve control signals, etc. through a communication protocol downward.

[0042] In this embodiment, an interface conversion device is designed, and then data transfer is realized among the control and protection device, the real-time simulator, and the data acquisition device by using this interface conversion device. By using the interface conversion device, a large number of hard wires are avoided to send the analog signals and digital signals of the DC transformer model, solving the technical problems that a large number of input and output interface resources are required for the existing DC transformer to conduct real-time simulation tests, and a large number of hard wiring works easily lead to wiring chaos and errors, and are not easy to be discovered.

[0043] The above is Embodiment 1 of a simulation test platform for a DC transformer provided by this application. The following is Embodiment 2 of a simulation test platform for a DC transformer provided by this application.

[0044] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of a simulation test platform for a DC transformer in this application.

[0045] The simulation test platform for the DC transformer in this embodiment includes: a real-time simulator, a data acquisition device, a control and protection device, and an interface conversion device; the control and protection device is used to output a control command to the interface conversion device; the real-time simulator is used to obtain the control command from the interface conversion device and run the built DC transformer simulation model according to the control command; the data acquisition device is used to obtain the output signal when running the control command from the real-time simulator through the interface conversion device and send the output signal to the control and protection device; the control and protection device is further used to generate a new control command based on the output signal.

[0046] Specifically, the interface conversion device includes: a first interface, a second interface, and a third interface; the first interface is the communication interface between the interface conversion device and the real-time simulator; the second interface is the communication interface between the interface conversion device and the data acquisition device; the third interface is the communication interface between the interface conversion device and the control and protection device.

[0047] It can be understood that the first interface is an optical fiber interface; the output signal includes an analog signal and a digital signal.

[0048] The communication protocol corresponding to the optical fiber interface in this embodiment is the aurora protocol.

[0049] Optionally, the second interface is an FT3 interface; the FT3 interface is used to transmit the analog signal in the output signal.

[0050] In this embodiment, the third interface includes: an intranet interface 1, an intranet interface 2, and a GOOSE network interface; the intranet interface 1 is used to send the discrete signals in the output signals to the intranet interface 2; the intranet interface 2 is used to send the discrete signals to the GOOSE network interface; the GOOSE network interface is used to send the discrete signals to the control and protection device; it is also used to receive the control instructions sent by the control and protection device; the intranet interface 2 is also used to send the control instructions to the intranet interface 1; the intranet interface 1 is also used to send the control instructions to the real-time simulator through the first interface.

[0051] The interface conversion device in this embodiment includes: a CPU plug-in interface and a GOOSE plug-in interface.

[0052] The CPU plug-in interface is divided into three parts: the first part is an optical fiber interface (i.e., the first interface) for communicating with the real-time simulator, and the interface protocol is the aurora protocol; the second part is an FT3 interface (i.e., the second interface, specifically a full-optical fiber current transformer data communication protocol interface), and the output is an analog signal in the FT3 form; the third part is the intranet interface 1, which is responsible for communicating with the GOOSE plug-in interface.

[0053] The entire signal flow is as follows: receive the analog signals and discrete signals from the real-time simulator, the analog signals are output through the FT3 interface, and the discrete signals are sent to the GOOSE plug-in interface through the intranet interface 1. Receive the discrete signals sent by the GOOSE plug-in interface through the intranet interface 1, and send them to the real-time simulator through the optical fiber channel corresponding to the first interface.

[0054] The GOOSE plug-in interface is divided into two parts: the first part is the intranet interface 2, which is responsible for communicating with the intranet interface 1 of the CPU plug-in interface; the second part is the GOOSE network interface, which is responsible for communicating with the control and protection device. The entire signal flow is as follows: use the GOOSE network interface to receive the GOOSE information sent by the control and protection device, and forward it to the intranet interface 1 of the CPU plug-in interface through the intranet interface 2. Receive the discrete signals of the CPU plug-in interface through the intranet interface 2, and then use the GOOSE network interface to forward them to the control and protection device.

[0055] It can be understood that the data acquisition device includes: a full-optical fiber current transformer. The acquisition of current data in the analog signals is realized through this transformer.

[0056] The signal conversion device in this embodiment interacts with the data acquisition device and the control and protection device to exchange analog signals, discrete signals, and control instructions through the GOOSE (Generic Object Oriented Substation Event) mechanism upward, and can interact with the real-time simulator through the communication protocol to exchange analog signals, discrete signals, valve control signals, etc. through optical fiber communication downward.

[0057] In this embodiment, the communication protocol of the signal conversion device is designed as follows:

[0058] First, a communication cycle of 50 us is specified (which can be modified according to simulation requirements, such as 100 us, 20 us, etc.). Each time the real-time simulation software calculates, the real-time simulator sends a complete frame. The data part of each frame is 128 32-bit words, including: 100 analog signals and 28 digital signals. The digital signals start from the 101st one (e.g., if there are only 5 analog signals and 3 digital signals, then 1 - 5 are analog signals and 101 - 103 are digital signals). Both the upstream and downstream channels follow this convention.

[0059] As shown in Table 1 below, each frame of data for both upstream and downstream is 130 32-bit words. The first 32-bit word is 0xAAAAAAAA, the 2nd to the 129th are the data part, and the 130th is CRC32. The CRC check bit is not actually used, and the CRC bit can be any 32-bit number.

[0060] Table 1

[0061] Name MSG FC CRC Bit width 32 bits 128 * 32 bits 32 bits Function Frame header Actual valid data Check bit Remarks AAAAAAAA Transmission volume No use

[0062] The protocol for the signal conversion device to send signals is shown in Table 2 below:

[0063] Table 2

[0064]

[0065]

[0066] The protocol for the signal conversion device to receive signals is shown in Table 3 below:

[0067] Table 3

[0068]

[0069] Furthermore, the simulation test platform of the DC transformer in this embodiment further includes: a waveform recording subsystem; the waveform recording subsystem is connected to the data acquisition device and is used to record the analog signals in the output signals. It can be understood that the data acquisition device in this embodiment also has the function of the waveform recording subsystem (specifically, a waveform recording board). The waveform recording board in the data acquisition device is an independent functional board, which can access the conventional sampling results and MU original messages sent from the gigabit optical port of the local CPU board through the gigabit optical port, as well as access the intermediate quantities and switch signals sent from the control host and the protection host through the FT3 interface. The recorded signals in the data acquisition device are sent to the waveform recording platform in the background for observation and recording through the waveform recording platform.

[0070] In this embodiment, a signal conversion device is provided in the simulation test platform of the DC transformer. The signal conversion device uses fiber optic signals to transfer data between the real-time simulator and the data acquisition device, thereby avoiding the use of a large number of hard wires to send the analog and digital signals of the DC transformer model by taking advantage of the characteristic of large data transmission volume of fiber optic data. This can save a large amount of input / output board (I / O board) resources, eliminate the need for a large number of hard wires, greatly reduce the number of wiring for data transmission, avoid complex wiring work, and prevent wiring errors caused by a huge number of wirings. The transmission path of signals is pre-allocated in the DC transformer simulation model, and the huge data transmission capacity of fiber optic is fully utilized. The sending and receiving of data volumes are only carried out through the fiber optic of the fiber optic communication protocol. This solves the technical problems that when conducting real-time simulation tests on existing DC transformers, a large amount of input and output interface resources are required, and a large amount of hard wiring work easily leads to wiring chaos and errors, which are not easy to detect.

[0071] In several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another power grid network to be installed, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical or other forms.

[0072] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0073] In addition, in each embodiment of the present application, the functional units can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0074] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A simulation test platform for a DC transformer, characterized in that, Including: A real-time simulator, a data acquisition device, a control and protection device, and an interface conversion device; The control and protection device is used to output a control instruction to the interface conversion device; The real-time simulator is used to obtain the control instruction from the interface conversion device and run the built DC transformer simulation model according to the control instruction; The data acquisition device is used to obtain the output signal when running the control instruction from the real-time simulator through the interface conversion device and send the output signal to the control and protection device; The control and protection device is further used to generate a new control instruction based on the output signal; The interface conversion device includes: a first interface, a second interface, and a third interface; The first interface is the communication interface between the interface conversion device and the real-time simulator; The second interface is the communication interface between the interface conversion device and the data acquisition device; The third interface is the communication interface between the interface conversion device and the control and protection device.

2. The simulation test platform of the DC transformer according to claim 1, characterized in that, The first interface is an optical fiber interface; The output signal includes an analog signal and a digital signal.

3. The simulation test platform of the DC transformer according to claim 2, characterized in that, The communication protocol corresponding to the optical fiber interface is the aurora protocol.

4. The simulation test platform of the DC transformer according to claim 1, characterized in that, The second interface is an FT3 interface; The FT3 interface is used to transmit the analog signal in the output signal.

5. The simulation test platform of the DC transformer according to claim 1, wherein, The third interface includes: a first internal network interface, a second internal network interface, and a GOOSE network interface; The first internal network interface is used to send the digital signal in the output signal to the second internal network interface; The second internal network interface is used to send the digital signal to the GOOSE network interface; The GOOSE network interface is used to send the digital signal to the control and protection device; and is also used to receive the control instruction sent by the control and protection device; The second internal network interface is further used to send the control instruction to the first internal network interface; The first internal network interface is further used to send the control instruction to the real-time simulator through the first interface.

6. The simulation test platform of the DC transformer according to claim 1, characterized in that The data acquisition device includes: an all-optical fiber current transformer.

7. The simulation test platform of the DC transformer according to claim 1, characterized in that, It further includes: A waveform recording subsystem; The waveform recording subsystem is connected to the data acquisition device and is used to record the analog signal in the output signal.

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