A source network coordination simulation device data interface device

Abstract

A kind of source network coordination simulation device data interface device, including rack cabinet, the rack cabinet is fixedly installed with scalable backplane, the scalable backplane is electrically connected with power module, at least one bidirectional signal conversion module and dynamic calibration module respectively;The bidirectional signal conversion module and dynamic calibration module are electrically connected by scalable backplane;The power supply circuit is formed by the power supply line of scalable backplate with bidirectional signal conversion module, dynamic calibration module respectively with power module.This utility model solves the problems of signal system mismatch, lack of bidirectional interaction capability, low conversion accuracy, insufficient expansion capability and poor anti-interference in prior art, provides a kind of modularization, scalable, high-precision source network coordination simulation device data interface device.

Description

Technical Field

[0001] This utility model relates to the field of power system simulation technology, specifically to a data interface device for realizing signal conversion and real-time data interaction between a hydropower unit simulation device (source end) and a power grid simulation device (grid end) in a source-grid coordination simulation scenario. Background Technology

[0002] With the rapid development of smart grids and distributed energy systems, the proportion of new energy grid connection continues to increase, making source-grid coordination simulation a key means to ensure the stability of the power system. However, the output signal of the hydropower unit simulation device (source end) is a 4-20mA current signal, while the input and output signals of the grid simulation device (grid end, such as ADPSS) are ±10V voltage signals. This signal mismatch leads to difficulties in real-time data interaction.

[0003] The existing technology has the following drawbacks: 1. Limitations in transmission direction: Traditional conversion devices only support unidirectional signal transmission, which cannot meet the bidirectional interaction requirements of source-network coordination simulation; 2. Insufficient conversion accuracy: Using a fixed proportional conversion method, the measurement error exceeds 1.5% under nonlinear conditions such as the vibration zone of hydropower units, making it difficult to accurately respond to sudden signals; 3. Limited scalability: Existing modular designs mostly use fixed backplane buses, with a maximum of only 64 channels per rack, which cannot meet the multi-channel requirements of multi-unit collaborative simulation; 4. Weak anti-interference capability: Commercial converters lack effective electromagnetic isolation measures, resulting in high signal distortion rates in the strong electromagnetic environment of power systems, which seriously affects the reliability of data acquisition. Utility Model Content

[0004] This invention aims to solve the problems of signal format mismatch, lack of bidirectional interaction capability, low conversion accuracy, insufficient scalability, and poor anti-interference in existing source-network simulation devices, and provides a modular, scalable, and high-precision source-network coordination simulation device data interface device.

[0005] To solve the above problems, the technical solution of this utility model is as follows: A source-network coordination simulation device data interface includes a chassis. The chassis houses an expandable backplane, a power module, a dynamic calibration module, and multiple bidirectional signal conversion modules. The expandable backplane is electrically connected to the power module, the bidirectional signal conversion modules, and the dynamic calibration modules. The bidirectional signal conversion modules are electrically connected to the dynamic calibration modules via the expandable backplane. The power module forms a power supply circuit with the bidirectional signal conversion modules and the dynamic calibration modules via the power supply lines of the expandable backplane.

[0006] Furthermore, the bidirectional signal conversion module includes a forward channel circuit board and a reverse channel circuit board, which are connected in parallel via copper busbars. The signal input and output terminals of both circuit boards are connected to external devices via signal interfaces on an expandable backplane.

[0007] Furthermore, the forward channel circuit board is connected in series with a sampling resistor, a differential compensation circuit, an instrumentation amplifier, and a first isolator; the reverse channel circuit board is connected in series with a voltage attenuation circuit, an integral compensation circuit, a DAC chip, and a second isolator.

[0008] Furthermore, the dynamic calibration module is electrically connected to the calibration signal input terminal of the bidirectional signal conversion module through the calibration signal output terminal, and forms a bidirectional data transmission channel with the calibration bus of the expandable backplane through the data feedback terminal.

[0009] Furthermore, the expandable backplane adopts a multi-layer PCB structure, on which: The main bus is connected to the main interfaces of the power module, bidirectional signal conversion module, and dynamic calibration module, respectively. The expansion interfaces are evenly distributed along the length of the backplane for plugging in new bidirectional signal conversion modules; The grounding copper foil is connected to the metal frame of the rack-mount chassis via conductive bolts.

[0010] Furthermore, the power module includes an independent isolated power supply unit and a timing control unit. The isolated power supply unit is plugged into the power interface of the expandable backplane via a power supply plug, and the timing control unit is connected to the power control terminals of the bidirectional signal conversion module and the dynamic calibration module via control signal lines.

[0011] Furthermore, the rack-mount chassis is equipped with guide rails, and the bidirectional signal conversion module and dynamic calibration module are slidably connected to the chassis via the rails. The back of the module is provided with a floating connector adapted to an expandable backplane. A signal holding circuit is correspondingly provided on the expandable backplane, and the signal holding circuit and the floating connector form a separable electrical connection.

[0012] The beneficial effects of this utility model are as follows: 1. Achieve reliable bidirectional signal interaction: The bidirectional signal conversion module adopts an independent parallel structure of forward and reverse channels, and with the signal transmission path design of the expandable backplane, it can simultaneously complete the bidirectional conversion and transmission of signals of different standards on the source side and the network side, which solves the limitation of unidirectional transmission of traditional devices and meets the bidirectional data interaction requirements of source-network coordinated simulation.

[0013] 2. Improve signal conversion stability: The dynamic calibration module is directly connected to the bidirectional signal conversion module through a dedicated calibration signal line, forming a real-time feedback adjustment loop. It can dynamically adjust the conversion parameters according to the signal conversion status, effectively improving the conversion consistency under nonlinear conditions and reducing signal distortion.

[0014] 3. Enhanced anti-interference capability: The power module is connected to the independent power supply line of the expandable backplane through the isolation unit. Together with the isolation components in the signal channel and the grounding structure of the backplane, it forms a multi-layer electrical isolation and electromagnetic shielding system, which reduces the interference of strong electromagnetic environment on signal transmission and improves the reliability of data interaction.

[0015] 4. Flexible expansion capability: The expandable backplane adopts a multi-layer wiring and distributed expansion interface design, combined with the sliding rail connection structure between the module and the chassis, which allows the bidirectional signal conversion module to be cascaded and expanded as needed to meet the channel quantity requirements of different scale source network simulation scenarios, and the expansion process does not affect the normal operation of the original module.

[0016] 5. Ensuring operational continuity: The rack-mount chassis's guide rails and floating connectors, combined with the signal holding circuit structure of the expandable backplane, enable hot-swapping of each functional module. This allows for uninterrupted simulation processes during module maintenance or replacement, improving the device's operational stability and maintenance convenience.

[0017] 6. Optimize overall structural integration: Each module achieves centralized electrical connection through an expandable backplane, replacing the traditional distributed wiring method, reducing line loss and signal interference points. At the same time, the compact layout of the rack-mount chassis improves space utilization and facilitates the integration and installation of the device in the simulation system. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings: Figure 1 A schematic diagram of the structure of the present invention.

[0019] In the diagram: 1. Chassis; 2. Conductive bolt; 3. Grounding copper foil; 4. Expandable backplane; 5. Forward channel circuit board; 6. Reverse channel circuit board; 7. Guide rail; 8. Dynamic calibration module; 9. Voltage attenuation circuit; 10. Integral compensation circuit; 11. DAC chip; 12. Second isolator; 13. Isolated power supply unit; 14. Timing control unit; 15. Power interface; 16. Data feedback terminal; 17. Signal holding circuit; 18. Floating connector; 19. First isolator; 20. Instrumentation amplifier; 21. Differential compensation circuit; 22. Sampling resistor; 23. Expansion interface. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 As shown, a data interface device for a source-grid coordination simulation device includes a chassis 1. The chassis 1 houses an expandable backplane 4, a power supply module, a dynamic calibration module 8, and multiple bidirectional signal conversion modules. The expandable backplane 4 is electrically connected to the power supply module, at least one bidirectional signal conversion module, and the dynamic calibration module 8. The bidirectional signal conversion module and the dynamic calibration module 8 are electrically connected via the expandable backplane 4. The bidirectional signal conversion module is used to perform bidirectional conversion between the 4-20mA current signal of the hydropower unit simulation device and the ±10V voltage signal of the grid simulation device ADPSS. The dynamic calibration module 8 is used to calibrate the conversion accuracy of the bidirectional signal conversion module in real time. The expandable backplane 4 is used to achieve multi-module cascading expansion. The power supply module supplies power to each module and provides electrical isolation, and forms a power supply loop with the bidirectional signal conversion module and the dynamic calibration module 8 via the power supply lines of the expandable backplane 4.

[0022] The power supply module, bidirectional signal conversion module, and dynamic calibration module 8 are centrally electrically connected via an expandable backplane 4 fixed within the rack-mount chassis 1. The power supply module provides power to other modules through the backplane's power supply lines, while the bidirectional signal conversion module and dynamic calibration module 8 exchange data through the backplane. This forms a closed-loop connection system of "power supply-signal conversion-calibration." This connection structure, with the expandable backplane 4 at its core, enables integrated collaborative work among the modules, avoiding signal interference and connection chaos caused by scattered wiring. It provides fundamental hardware support for the device's bidirectional signal conversion and dynamic calibration functions, while simplifying the overall assembly process.

[0023] Furthermore, the bidirectional signal conversion module includes a forward channel circuit board 5 and a reverse channel circuit board 6. The forward channel circuit board 5 and the reverse channel circuit board 6 are connected in parallel via copper busbars, and their signal input and output terminals are connected to external devices through the signal interfaces of the expandable backplane 4. The forward channel (source side → grid side) and the reverse channel (grid side → source side) of the bidirectional signal conversion module are connected in parallel via copper busbars, forming independent and parallel signal transmission paths. The signal input and output terminals of the two channels are connected to external devices (hydropower unit simulation device, power grid simulation device) through the signal interfaces of the expandable backplane 4, realizing the physical isolation transmission of bidirectional signals. The parallel channel structure avoids mutual interference between forward and reverse signals, and the copper busbar connection ensures low impedance characteristics of signal transmission. The unified connection to external devices through the backplane interface simplifies the connection complexity between the device and the external system, realizing simultaneous and independent bidirectional signal transmission, breaking through the limitations of traditional unidirectional transmission.

[0024] Furthermore, the forward channel is connected in series with a 250Ω ±0.01% precision sampling resistor 22, a differential compensation circuit 21, a TI INA188 instrumentation amplifier 20, and a first isolator 19 (ADI ADuM3151 isolator). The forward channel converts the 4-20mA current signal into a 1-5V voltage signal through the precision sampling resistor 22, and outputs a ±10V voltage signal after processing by the differential compensation circuit 21, the instrumentation amplifier 20, and the first isolator 19. The reverse channel of the bidirectional signal conversion module is connected in series with a voltage attenuation circuit 9, an integral compensation circuit 10, a DAC chip 11 (ADI AD5755 16bit DAC), and a second isolator 12 (Mornsun B0505XT-2WR3 isolation module). The reverse channel conditions the ±10V voltage signal through the voltage attenuation circuit 9, and outputs a 4-20mA current signal after processing by the integral compensation circuit 10, the DAC chip 11, and the isolation module. The forward path connects the sampling resistor 22, the differential compensation circuit 21, the instrumentation amplifier 20, and the isolator in series via circuit board wiring, forming a signal processing link of "current → voltage → compensation → amplification → isolation". The reverse path connects the voltage attenuation circuit 9, the integral compensation circuit 10, the DAC chip, and the isolator in series via circuit board wiring, forming a signal processing link of "voltage → attenuation → compensation → current reconstruction → isolation". The orderly series structure ensures that the signal is processed step by step according to the preset logic, reducing signal distortion.

[0025] Furthermore, the dynamic calibration module 8 is electrically connected to the calibration signal input terminal of the bidirectional signal conversion module through the calibration signal output terminal, and forms a bidirectional data transmission channel with the calibration bus of the expandable backplane 4 through the data feedback terminal 16. The calibration cycle of the dynamic calibration module 8 is 5ms (the typical simulation step size of ADPSS is 5ms, ensuring that calibration and simulation are synchronized), which matches the simulation step size of the power grid simulation device ADPSS, and has a built-in transfer function based on the characteristics of the turbine (parameters include: water flow inertia time constant 0.5-2.5s, guide vane response time 0.1-0.3s, damping adjustment coefficient 0.6-1.2). The calibration process of the dynamic calibration module 8 includes: injecting a 4 / 12 / 20mA standard test signal, measuring the output deviation of the bidirectional signal conversion module, and automatically adjusting the differential compensation coefficient or integral compensation coefficient. The dynamic calibration module 8 sends a standard test signal to the bidirectional signal conversion module through a dedicated calibration signal output terminal. At the same time, it receives real-time output data from the conversion module through the calibration bus of the expandable backplane 4 via the data feedback terminal, forming a closed-loop control link of "calibration signal injection → feedback data acquisition → parameter adjustment". This ensures the real-time performance and accuracy of the calibration signal and feedback data, enabling the dynamic calibration module 8 to adjust the working parameters of the conversion module in a targeted manner, effectively improving the conversion consistency under nonlinear conditions and enhancing the signal conversion accuracy.

[0026] Furthermore, the expandable backplane 4 adopts a multi-layer PCB structure and an improved daisy-chain topology. The backplane bus bandwidth satisfies the formula "BW=N×2.5MHz", where N is the number of active channels. The expandable backplane 4 supports single-rack cascading expansion to 256 channels and is equipped with: The main bus is connected to the main interfaces of the power module, bidirectional signal conversion module, and dynamic calibration module 8, respectively. Expansion interfaces 23 are evenly distributed along the length of the backplane and are used to plug in newly added bidirectional signal conversion modules to increase the number of channels; The grounding copper foil 3 is connected to the metal frame of the rack-mount chassis 1 via conductive bolts 2. The conductive connection between the grounding copper foil 3 and the metal frame of the chassis 1 forms an overall grounding grid, reducing electromagnetic interference.

[0027] The distributed expansion interface 23 allows the device to expand the number of channels as needed to adapt to simulation scenarios of different scales; the overall grounding grid effectively shields external electromagnetic interference and ensures the stability of signal transmission.

[0028] Furthermore, the power module includes an independent isolated power supply unit 13 and a timing control unit 14. The isolated power supply unit 13 is plugged into the power interface 15 of the expandable backplane 4 via a power supply plug. The timing control unit 14 is connected to the power control terminals of the bidirectional signal conversion module and the dynamic calibration module 8 via control signal lines. The power-on sequence of the power module is "isolated power supply → digital circuit → analog circuit", with a power-on interval of 50ms ± 5ms between adjacent components. The power module uses a Mornsun B0505XT-2WR3 isolation module, providing 1500VAC electrical isolation. The isolated power supply unit 13 reduces power interference through physical isolation, protecting sensitive electronic components; the timing control avoids current surges caused by multiple modules being powered on simultaneously, improving the power supply safety and service life of the device.

[0029] Furthermore, the rack-mount chassis 1 is equipped with guide rails 7. The bidirectional signal conversion module and dynamic calibration module 8 are slidably connected to the chassis 1 via the guide rails, and a floating connector adapted to the expandable backplane 4 is provided on the back of the module. A signal holding circuit is correspondingly provided on the expandable backplane 4, and the signal holding circuit and the floating connector form a separable electrical connection. The guide rails 7 and the floating connectors ensure convenient module installation and removal and reliable connection. The signal holding circuit, in conjunction with the hot-swappable structure, enables uninterrupted operation during module maintenance or replacement, improving the availability and maintenance efficiency of the device.

[0030] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this utility model should not be considered as limited to the specific forms described in the embodiments. The scope of protection of this utility model also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A data interface device for a source-network coordination simulation device, characterized in that, The device includes a chassis, within which are installed an expandable backplane, a power module, a dynamic calibration module, and multiple bidirectional signal conversion modules. The expandable backplane is electrically connected to the power module, the bidirectional signal conversion module, and the dynamic calibration module, respectively. The bidirectional signal conversion module and the dynamic calibration module are electrically connected through the expandable backplane. The power module forms a power supply circuit with the bidirectional signal conversion module and the dynamic calibration module through the power supply lines of the expandable backplane.

2. The data interface device of the source-network coordination simulation device according to claim 1, characterized in that, The bidirectional signal conversion module includes a forward channel circuit board and a reverse channel circuit board. The forward channel circuit board and the reverse channel circuit board are connected in parallel via copper busbars, and their signal input and output terminals are respectively connected to external devices through the signal interface of the expandable backplane.

3. The data interface device of the source-network coordination simulation device according to claim 2, characterized in that, The forward channel circuit board is connected in series with a sampling resistor, a differential compensation circuit, an instrumentation amplifier, and a first isolator; the reverse channel circuit board is connected in series with a voltage attenuation circuit, an integral compensation circuit, a DAC chip, and a second isolator.

4. The data interface device of the source-network coordination simulation device according to claim 1, characterized in that, The dynamic calibration module is electrically connected to the calibration signal input terminal of the bidirectional signal conversion module through the calibration signal output terminal, and forms a bidirectional data transmission channel with the calibration bus of the expandable backplane through the data feedback terminal.

5. The data interface device of the source-network coordination simulation device according to claim 1, characterized in that, The expandable backplane adopts a multi-layer PCB structure, on which: The main bus is connected to the main interfaces of the power module, bidirectional signal conversion module, and dynamic calibration module, respectively. The expansion interfaces are evenly distributed along the length of the backplane for plugging in new bidirectional signal conversion modules; The grounding copper foil is connected to the metal frame of the chassis via conductive bolts.

6. The data interface device of the source-network coordination simulation device according to claim 1, characterized in that, The power module includes an independent isolated power supply unit and a timing control unit. The isolated power supply unit is plugged into the power interface of the expandable backplane via a power supply plug. The timing control unit is connected to the power control terminals of the bidirectional signal conversion module and the dynamic calibration module via control signal lines.

7. The data interface device for the source-network coordination simulation device according to claim 1, characterized in that, The chassis is equipped with guide rails, and the bidirectional signal conversion module and dynamic calibration module are slidably connected to the chassis via the rails. The back of the module is provided with a floating connector adapted to an expandable backplane. A signal holding circuit is correspondingly provided on the expandable backplane, and the signal holding circuit and the floating connector form a separable electrical connection.

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