CN113295917A - Protection device sampling unit based on combination of Rogowski coil and LPCT - Google Patents
Protection device sampling unit based on combination of Rogowski coil and LPCT Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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Abstract
The invention discloses a Rogowski coil and LPCT (low power current transformer) combined protection device sampling unit, which consists of a Rogowski coil and LPCT combined current sensor input module, a signal conditioning circuit, an A/D (analog/digital) conversion circuit, a CPU (central processing unit) chip circuit, a post-processing circuit, a current output module, a power supply module and a communication module, wherein the Rogowski coil and LPCT combined current sensor input module is connected with the signal conditioning circuit; the Rogowski coil and LPCT combined current sensor input module is connected with a signal conditioning circuit; the signal conditioning circuit is connected with the A/D conversion circuit; the A/D conversion circuit, the power supply module and the communication module are connected with the CPU chip circuit; the CPU chip circuit is connected with the post-processing circuit; the post-processing circuit is connected with the current output module. The sampling requirement of 512 points/cycle is met, the sampling accuracy reaches 0.1 level, no information packet is lost in the circuit data processing and transmission process, information can be completely acquired, the digitization and edge calculation functions of a protection device are met, and the defects of insufficient precision, accuracy and stability of signals output by sampling in the prior art are solved.
Description
Technical Field
The application relates to the technical field of circuit design, in particular to a protection device sampling unit based on a Rogowski coil and LPCT combination.
Background
At present, a new round of scientific and technological revolution and industrial change accelerate the evolution, the digital economy is promoted to develop vigorously, and the digital transformation of the world economy is trended greatly. At present, the traditional transformer substation is gradually eliminated and gradually develops towards a digital and intelligent transformer substation. The digital transformer substation serves as a key node and a basic link of the intelligent power grid and has the functions of connecting circuits, transmitting electric energy, changing voltage levels, controlling electric energy flow and the like. Meanwhile, the electronic transformer is used as basic measuring equipment of the intelligent power grid. However, the sampling frequency of the electronic transformer, merging unit and other devices in the market is low, and fixed sampling is used in the sampling process without frequency tracking, which all result in insufficient signal precision, accuracy and stability of the sampling output of the sensor.
Disclosure of Invention
In order to solve the above problems, the present application provides a protection device sampling unit based on a combination of a rogowski coil and an LPCT, which is composed of a rogowski coil and LPCT combined current sensor input module, a signal conditioning circuit, an a/D conversion circuit, a CPU chip circuit, a post-processing circuit, a current output module, a power supply module, and a communication module;
the Rogowski coil and LPCT combined current sensor input module is connected with a signal conditioning circuit; the signal conditioning circuit is connected with the A/D conversion circuit; the A/D conversion circuit, the power supply module and the communication module are connected with the CPU chip circuit; the CPU chip circuit is connected with the post-processing circuit; the post-processing circuit is connected with the current output module.
Preferably, the rogowski coil and the LPCT are combined with a current sensor input module, the rogowski coil in the module provides protective sampling current of a protective device, and the LPCT provides measuring and metering sampling current of the protective device;
the signal conditioning circuit is used for amplifying, isolating and filtering the differential signal output by the Rogowski coil when the differential signal is restored;
the A/D conversion circuit converts the analog signal output by the signal conditioning circuit into a digital signal for processing by a CPU chip circuit;
CPU chip circuit, process the digital signal that A/D converter circuit outputs;
the post-processing circuit converts the digital signal output by the CPU chip circuit into analog quantity;
the current output module outputs the current which meets the sampling requirement of the sampling unit;
the power supply module supplies power to the electronic transformer on the sampling unit equipment side in a mode of switching energy supply of laser and the energy-taking coil;
and the communication module is used for communicating the CPU chip circuit with the interior of the protection device or the merging unit.
Preferably, the input module of the current sensor combining the rogowski coil and the LPCT can adopt a combination of a PCB type rogowski coil and a 0.1-level LPCT coil electronic current transformer.
Preferably, the signal conditioning circuit includes: the current sensing equivalent circuit, the filter circuit, the integrating circuit and the phase-shifting circuit; wherein the content of the first and second substances,
the equivalent circuit of current sensing is used for converting the current output by the input module of the Rogowski coil and LPCT combined current sensor into weak voltage and current signals;
the filter circuit is used for eliminating higher harmonic noise;
the integrating circuit is used for restoring a differential signal output by the Rogowski coil;
and a phase shift circuit for eliminating or reducing time delay generated in signal processing.
Preferably, the A/D conversion circuit can adopt a high-precision chip with the performance not lower than AD 7685.
Preferably, the CPU chip circuit may be a multi-core processor chip with performance not lower than OMAP 5910.
The protection device sampling unit based on combination of Rogowski coil and LPCT provided by the application satisfies the sampling requirement of 512 points/cycle, the sampling accuracy reaches 0.1 level, and has good temperature characteristic, no information packet loss is caused in the circuit data processing and transmission process, information can be completely acquired, the ratio difference and the phase difference both meet the requirement of 0.1 level sampling accuracy, and the digitization and edge calculation functions of the protection device are satisfied.
Drawings
Fig. 1 is a schematic structural diagram of a protection device sampling unit based on a combination of a rogowski coil and an LPCT provided by the present application;
fig. 2 is a schematic diagram of a signal conditioning circuit provided in the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The application provides a protection device sampling unit based on a Rogowski coil and LPCT combination, which is structurally shown in figure 1, a multi-core processor design is carried out on a data sampling unit of a combined electronic transformer, and the sampling unit consists of a Rogowski coil and LPCT combined current sensor input module, a signal conditioning circuit, an A/D conversion circuit, a CPU chip circuit, a post-processing circuit, a current output module, a power supply module and a communication module; the A/D conversion circuit and the CPU chip are mainly subjected to type selection analysis, and the signal acquisition requirement of high precision and high stability is met.
The Rogowski coil and LPCT combined current sensor input module is connected with a signal conditioning circuit; the signal conditioning circuit is connected with the A/D conversion circuit; the A/D conversion circuit, the power supply module and the communication module are connected with the CPU chip circuit; the CPU chip circuit is connected with the post-processing circuit; the post-processing circuit is connected with the current output module.
For a better understanding of the present application, the contents of the present application will be further described below with reference to the drawings and examples of the specification.
As shown in figure 1, the protection device sampling unit based on the combination of the Rogowski coil and the LPCT is provided, a multi-core processor design is carried out on a data sampling unit of a combined electronic transformer, the sampling unit comprises a signal conditioning circuit, an A/D conversion module, a CPU module, a power module and the like, the A/D conversion circuit and the CPU chip are mainly subjected to model selection analysis, and the requirements of high-precision and high-stability signal acquisition are met.
The input module of the Rogowski coil and the LPCT combined current sensor is connected with a signal conditioning circuit; the signal conditioning circuit is connected with the A/D conversion circuit; the A/D conversion circuit, the power supply module and the communication module are connected with the CPU chip circuit; the CPU chip circuit is connected with the post-processing circuit; the post-processing circuit is connected with the current output module.
The Rogowski coil and LPCT combined current sensor input module can adopt a combination of a PCB type Rogowski coil and a 0.1-grade LPCT coil electronic current transformer, and guarantees the precision of the measurement or metering of the sampling current and the real-time performance of the protection of the sampling current by a protection device in a mode of combining a hardware integration technology and a digital software integration technology. When the primary current exceeds a rated value under the condition of overload or short circuit of the system, restoring the primary measured protection current in real time without distortion by using the transient characteristic of the Rogowski coil; when the primary current is below the rated value, the accuracy error requirement of the measuring or metering current can be met by utilizing the steady-state characteristic of the LPCT.
The signal conditioning circuit is used for amplifying, isolating and filtering the differential signal output by the Rogowski coil when the differential signal is restored; the signal conditioning circuit includes: the current sensing equivalent circuit, the filter circuit, the integrating circuit and the phase-shifting circuit; the equivalent circuit of the current sensing is used for converting the current output by the input module of the Rogowski coil and LPCT combined current sensor into weak voltage and current signals, namely converting large current signals into small voltage and current signals which are easy to measure; the filter circuit is used for eliminating higher harmonic noise to smooth the waveform, and the effect is in direct proportion to the order; the integrating circuit is used for restoring a differential signal output by the Rogowski coil; and a phase shift circuit for eliminating or reducing time delay generated in signal processing.
The A/D conversion circuit converts the analog signal output by the signal conditioning circuit into a digital signal for processing by a CPU chip circuit to realize high-precision signal acquisition;
the CPU chip circuit is used for processing the digital signal output by the A/D conversion circuit and improving the efficiency of digital signal processing;
the post-processing circuit converts the digital signal output by the CPU chip circuit into analog quantity so as to adapt to the output of the analog port;
the current output module outputs the current which meets the sampling requirement of the sampling unit;
the power supply module supplies power to the electronic transformer on the sampling unit equipment side in a mode of switching energy supply of laser and the energy-taking coil, and the energy supply mode can effectively reduce power consumption and failure rate and ensure continuous and stable work of a system;
and the communication module is used for communicating the CPU chip circuit with the interior of the protection device or the merging unit, and has high communication speed and strong anti-interference capability.
As a further optimization scheme of the application, the chip of the CPU chip circuit adopts an OMAP5910 multi-core processor. The DSP processor and the ARM processor are integrated in the chip, the DSP processor provides 2 multiply-accumulate (MAC) units, 1 arithmetic logic unit with 40 bits and 1 arithmetic logic unit with 16 bits based on a TMS320C55X core, and most instructions can run in parallel due to the fact that the DSP adopts a double-ALU structure, the working frequency of the DSP processor reaches 150MHz, and the power consumption is lower. The ARM processor is a TI925T processor based on an ARM9 core, and comprises 1 instruction cache of 16KByte and a data cache of 8 KByte; l coprocessors, the instruction length may be 16 bits or 32 bits. The OMAP5910 has the advantages of high integration level, strong hardware reliability and stability, strong data processing capability, low power consumption and the like.
As a further optimization scheme of the application, the high-precision AD7685 is adopted by the chip of the A/D conversion circuit. The main function is to realize the conversion from analog quantity to digital quantity, the quality performance of the system directly affects the sampling stability and accuracy of the whole collector system, and the real-time property of the collected current is required. AD7685 is a 16-bit successive approximation type digital-to-analog converter with high precision and charge redistribution; 6 channels, which ensures that 16-bit conversion has no code loss, and the throughput rate of each channel is higher and is 250 ksps; 2.3V-5.5V single power supply is adopted for supplying power, and the voltage of a logic interface is 1.8V-5V; when the power supply voltage is 5V and the throughput rate is 100ksps, the power consumption is only 1.35mW, and the power consumption is low; the digital-to-analog converters are connected in a daisy chain mode without pipeline delay and have a busy and idle indication function; a 10-pin MSOP package or QFN package is adopted; a low-noise, broadband and short-aperture delay sampling circuit is integrated inside; can adapt to the ambient temperature of-40 ℃ to +85 ℃. The strong signal acquisition function of the A/D conversion chip can be seen in the characteristics, and the requirements of 16-bit precision and 25600Hz sampling rate of the sampling result of the electronic transformer are completely met.
As shown in comparison 2, the signal conditioning circuit related to the application mainly comprises four parts, namely a current sensing equivalent circuit, a filter circuit, an integrating circuit and a phase-shifting circuit.
The design designs an improved composite integrator by improving circuits of an analog integrator and a digital integrator. The composite integrator has a better frequency effect, effectively inhibits the amplification of the low-frequency signal in the aspect of the low-frequency signal, ensures the measurement precision of the low-frequency signal, and simultaneously ensures the measurement result of the high-frequency signal in the aspect of the high-frequency signal. The in-phase integrator and the reverse-phase integrator act simultaneously, the phase frequency characteristic of the in-phase integrator is a horizontal segment of minus 90 degrees at 10-20kHz, the broadband response is achieved, the integration effect is better, and the reduction of signals is more accurate.
The phase shift circuit has the advantages of both the all-pass filter and the constant-delay filter, can ensure stable amplitude-frequency characteristic and meet the standard of constant delay, and has good phase shift effect.
Matlab modeling simulation analysis is carried out on the Rogowski coil and LPCT combined current transformer, a novel second-order low-pass filter circuit is provided and designed, the requirement on cut-off frequency is met, and simulation results show that the designed current combined electronic transformer meets the requirement on high sampling frequency of 512 points/cycle waves, the cut-off frequency of 2.6kHz is achieved, 50-order harmonics can be restored, and the transient transmission and transformation characteristics are good.
Matlab modeling simulation analysis is carried out on analog integration and digital integration in an integrating circuit, amplitude-frequency and phase-frequency characteristics of the analog integration and the digital integration are compared, and an improved composite integrator is designed to enable the composite integrator to restore differential signals more accurately.
According to the embodiment, the protection device sampling unit based on the combination of the Rogowski coil and the LPCT meets the sampling requirement of 512 points/cycles, the sampling accuracy reaches 0.1 level, the protection device has good temperature characteristics, no information packet is lost in the circuit data processing and transmission process, information can be completely acquired, the ratio difference and the phase difference both meet the requirement of 0.1 level sampling accuracy, and the protection device digitization and edge calculation functions are met.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (6)
1. A protection device sampling unit based on the combination of a Rogowski coil and an LPCT (low power current transformer) is composed of a Rogowski coil and LPCT combined current sensor input module, a signal conditioning circuit, an A/D (analog/digital) conversion circuit, a CPU (central processing unit) chip circuit, a post-processing circuit, a current output module, a power supply module and a communication module;
the Rogowski coil and LPCT combined current sensor input module is connected with a signal conditioning circuit; the signal conditioning circuit is connected with the A/D conversion circuit; the A/D conversion circuit, the power supply module and the communication module are connected with the CPU chip circuit; the CPU chip circuit is connected with the post-processing circuit; the post-processing circuit is connected with the current output module.
2. The sampling unit of claim 1, wherein the rogowski coil and LPCT combine a current sensor input module in which the rogowski coil provides a protective sampling current for a protective device, and the LPCT provides a measurement and metering sampling current for the protective device;
the signal conditioning circuit is used for amplifying, isolating and filtering the differential signal output by the Rogowski coil when the differential signal is restored;
the A/D conversion circuit converts the analog signal output by the signal conditioning circuit into a digital signal for processing by a CPU chip circuit;
CPU chip circuit, process the digital signal that A/D converter circuit outputs;
the post-processing circuit converts the digital signal output by the CPU chip circuit into analog quantity;
the current output module outputs the current which meets the sampling requirement of the sampling unit;
the power supply module supplies power to the electronic transformer on the sampling unit equipment side in a mode of switching energy supply of laser and the energy-taking coil;
and the communication module is used for communicating the CPU chip circuit with the interior of the protection device or the merging unit.
3. The acquisition unit of claim 2, wherein the Rogowski coil and LPCT combined current sensor input module can adopt a combination of a PCB Rogowski coil and a 0.1-level LPCT coil electronic current transformer.
4. The acquisition unit of claim 1 or 2, wherein the signal conditioning circuit comprises: the current sensing equivalent circuit, the filter circuit, the integrating circuit and the phase-shifting circuit; wherein the content of the first and second substances,
the equivalent circuit of current sensing is used for converting the current output by the input module of the Rogowski coil and LPCT combined current sensor into weak voltage and current signals;
the filter circuit is used for eliminating higher harmonic noise;
the integrating circuit is used for restoring a differential signal output by the Rogowski coil;
and a phase shift circuit for eliminating or reducing time delay generated in signal processing.
5. The acquisition unit of claim 1, the a/D conversion circuit being implemented using a high precision chip with performance no lower than AD 7685.
6. The acquisition unit of claim 1, the CPU chip circuitry being implemented using a multi-core processor chip having a performance no lower than OMAP 5910.
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| CN202110378960.1A CN113295917A (en) | 2021-04-08 | 2021-04-08 | Protection device sampling unit based on combination of Rogowski coil and LPCT |
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Cited By (1)
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