CN114966310A - An experimental platform for fault current limiting device in DC system - Google Patents

Abstract

The invention relates to an experimental platform for a DC system fault current limiting device in the technical field of electrical engineering, comprising a signal acquisition module, a signal conditioning module, a signal processing module, and a measurement and control center. The fault signal, the signal conditioning module is used to condition the fault signal collected by the signal acquisition module, the signal processing module is used to record the conditioned fault signal, and the measurement and control center is used to monitor each module, Simultaneously analyze the data in real time. Compared with the prior art, the present invention has the beneficial effects that the system meets the experimental requirements of rapid response under high voltage, large current and strong magnetic field environment.

Description

An experimental platform for fault current limiting device in DC system

technical field

The invention relates to the technical field of electrical engineering, in particular to an experimental platform for a DC system fault current limiting device.

Background technique

Hybrid DC circuit breakers have become the focus of research on DC circuit breakers at this stage. They can be divided into two types: natural commutation type and forced commutation type. The natural commutation type uses the arc voltage to complete the first transfer of the fault current. The conduction loss is small, but the voltage level of the application is limited by the magnitude of the arc voltage; the forced commutation type uses the auxiliary switch to complete the first current transfer, and its conduction loss is higher than the natural commutation type during normal operation, and can be applied to more high voltage class.

As the voltage level of the DC system increases, the rise rate and amplitude of the fault current will also be larger, resulting in an increase in the breaking pressure of the circuit breaker, resulting in the arrester needing to absorb more energy during the breaking process, and excessive faults The current increases the initial energy storage of the line energy storage element, so that the arrester energy absorption continues to rise after the DC circuit breaker interrupts the fault current, which increases the manufacturing difficulty of the arrester.

To sum up, the problems existing in the prior art are that the experimental environment of the DC circuit breaker has a high voltage level, a large fault current, and the on-site measurement and control equipment often fails. In order to complete the DC circuit breaker experiment in the environment of high voltage, high current and strong magnetic field, the DC fault current limiting device is used in the test platform to cooperate with the DC circuit breaker to break the short-circuit current, which can effectively suppress the peak value of the short-circuit current.

In order to meet the above requirements, the present invention realizes the cooperation experiment of the DC circuit breaker and the current limiting device under the environment of high voltage, high current and strong magnetic field, and performs performance test and analysis.

Based on this, the present invention designs an experimental platform for a DC system fault current limiting device to solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an experimental platform for a DC system fault current limiting device, so as to solve the problems raised in the above background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: an experimental platform for a fault current limiting device of a DC system, comprising a signal acquisition module, a signal conditioning module, a signal processing module, and a measurement and control center, and the signal acquisition module is used for collecting The fault signals of current and voltage, the signal conditioning module is used to condition the fault signals collected by the signal acquisition module, the signal processing module is used to record the conditioned fault signals, and the measurement and control center is used to The module monitors and analyzes the data in real time.

In the above-mentioned experimental platform for a DC system fault current limiting device, the signal acquisition module includes a DC fault current limiter, an energy absorption branch, and voltage and current signal acquisition, and the DC fault current limiter is used for The DC fault current of the system is limited, the energy absorption branch is used for absorbing the energy of the fault current, and the voltage and current signal acquisition is used for acquisition of current and voltage signals.

In the above-mentioned experimental platform for the fault current limiting device of the DC system, the signal conditioning module includes an operational amplifier module, an A\D conversion module, an IGBT switch, and an IGBT drive module, and the operational amplifier module is used for The voltage and analog-digital are adjusted to match with the A\D conversion module, the A\D conversion module converts the analog signal into a digital signal, the IGBT switch is used to charge and discharge the signal conditioning module, and the IGBT drives The module is used to drive the IGBT module to start.

In the above-mentioned experimental platform for the fault current limiting device of the DC system, the signal processing module includes a digital signal processing module, an optical fiber module, an optical fiber converter, and a single-chip microcomputer module, and the digital signal processing module is used to The digital signal converted by the signal conditioning module is processed, and the optical fiber module and the optical fiber converter are used for transmitting the digital signal processed by the signal conditioning module to the single-chip microcomputer module, and the single-chip microcomputer module is used for processing the digital signal.

In the above-mentioned experimental platform for a DC system fault current limiting device, the measurement and control center includes a signal acquisition module, a serial port control module, a measurement analysis module, and a data display storage module, and the signal acquisition module is used to The signals in the system are collected, the serial port control module is used to control the serial port data of each module, the measurement analysis module is used to measure and analyze the data in each module, and the data display storage module is used to analyze the data. display and store.

The present invention is realized in the following way: in the experimental platform of the DC system fault current limiting device, the DC fault current limiting device cooperates with the DC circuit breaker to break the short-circuit current, which can effectively suppress the peak value of the short-circuit current and realize the high-voltage and high-current environment. Conduct performance test and analysis on the cooperation experiment of DC circuit breaker and current limiting device.

Another object of the present invention is to provide experiments and performance tests of the device in an environment with a strong magnetic field. The optical signal is not affected by the electromagnetic field, and the signal is transmitted by the optical fiber. At the same time, it is packaged in a shielded aluminum box to enhance the anti-interference ability of the system, and to improve the stability and reliability of the experimental system in a strong magnetic field environment.

Another object of the present invention is to provide a faster system response speed with a high clock frequency single-chip microcomputer; at the same time, based on the virtual instrument LabVIEW software platform to complete the real-time acquisition, digital storage, digital display and analysis and processing of fault signals.

The advantages and positive effects of the present invention are that the system meets the experimental requirements of the above-mentioned device for rapid response in the environment of high voltage, large current and strong magnetic field.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic diagram of the frame structure of an experimental platform for a DC system fault current limiting device of the present invention;

FIG. 2 is a schematic work flow diagram of an experimental platform for a fault current limiting device in a DC system according to the present invention.

In the accompanying drawings, the list of components represented by each number is as follows:

1-Signal acquisition module, 2-Signal conditioning module, 3-Signal processing module, 4-Measurement and control center.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to FIGS. 1 to 2 , the present invention provides a technical solution: an experimental platform for a DC system fault current limiting device, comprising a signal acquisition module 1 , a signal conditioning module 2 , a signal processing module 3 , and a measurement and control center 4 , the signal acquisition module 1 is used to collect fault signals of current and voltage, the signal acquisition module 1 includes a DC fault current limiter, an energy absorption branch, and voltage and current signal acquisition, and the DC fault current limiter is used for the system The DC fault current is limited, the energy absorption branch is used to absorb the energy of the fault current, the voltage and current signal collection is used to collect the current and voltage signals, and the signal conditioning module 2 is used to collect the signal The fault signal collected by the acquisition module 1 is conditioned, and the signal conditioning module 2 includes an operational amplifier module, an A\D conversion module, an IGBT switch, and an IGBT drive module, and the operational amplifier module is used to adjust the voltage and modulus, It can be matched with the A\D conversion module, the A\D conversion module converts the analog signal into a digital signal, the IGBT switch is used to charge and discharge the signal conditioning module 2, and the IGBT drive module is used to drive the IGBT module. Start, the signal processing module 3 is used to record the conditioned fault signal, the signal processing module 3 includes a digital signal processing module, an optical fiber module, an optical fiber converter, and a single-chip microcomputer module, and the digital signal processing module is used for The digital signal converted by the signal conditioning module 2 is processed, and the optical fiber module and the optical fiber converter are used to transmit the digital signal processed by the signal conditioning module 2 to the single-chip microcomputer module, and the single-chip microcomputer module is used to process the digital signal. The measurement and control center 4 is used to monitor each module and analyze the data in real time. The measurement and control center 4 includes a signal acquisition module, a serial port control module, a measurement analysis module, and a data display storage module. The signal acquisition module is used for The signals in the whole system are collected, the serial port control module is used to control the serial port data of each module, the measurement analysis module is used to measure and analyze the data in each module, and the data display storage module is used to The data is displayed and stored, and the DC fault current limiting device cooperates with the DC circuit breaker to break the short-circuit current. The DC fault current limiter (DC-FCLD) uses ferromagnetic materials, and uses the principle of eddy current and hysteresis to suppress the short-circuit fault current and consume the fault energy. When no fault occurs, the DC-FCLD has no effect on the DC system and remains in a low resistance state; when a short-circuit fault occurs, the DC-FCLD inductor will suppress the peak value of the short-circuit current and consume part of the fault energy on the resistance , to reduce the size of the fault current, and use the transfer circuit to dissipate the remaining energy in the absorption branch. Due to the increase of the voltage level of the DC system, the rise rate and amplitude of the fault current will also be larger. In order to make the signal entering the conditioning channel within the normal working range of the electronic components, a passive attenuation circuit is designed as the first part of the fault signal acquisition circuit. level one. The design adopts various compensation methods and computer simulation debugging to change the amplitude and conditions of the self-excited oscillation of the passive attenuation circuit to avoid the occurrence of the self-excited oscillation. The LabVIEW software platform on the PC side completes the real-time acquisition, digital storage, digital display and analysis and processing of fault signals. The system design integrates the digital oscilloscope module on the LabVIEW software platform, which is composed of four parts: vertical system module, horizontal system module, trigger system module, and display system module, so as to meet the requirements of automatic measurement in the environment of high voltage, high current and strong magnetic field. , automatic storage, high degree of anti-interference experimental requirements.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense, for example, "connected" may be a fixed connection It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations. In the description of this specification, description with reference to the terms "one embodiment", "example", "specific example", etc. means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one of the present invention examples or examples. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. The above-disclosed preferred embodiments of the present invention are provided only to help illustrate the present invention. The preferred embodiments do not exhaust all the details, nor do they limit the invention to only the described embodiments. Obviously, many modifications and variations are possible in light of the content of this specification. The present specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is to be limited only by the claims and their full scope and equivalents.

Claims (5)

1. The utility model provides an experiment platform for direct current system fault current limiting device, a serial communication port, including signal acquisition module (1), signal conditioning module (2), signal processing module (3), observe and control center (4), signal acquisition module (1) is used for gathering the fault signal of electric current and voltage, signal conditioning module (2) are used for conditioning the fault signal that signal acquisition module (1) gathered, signal processing module (3) are used for taking notes the fault signal after conditioning, observe and control center (4) and be used for monitoring each module, carry out real-time analysis to data simultaneously.

2. The experimental platform for the fault current limiting device of the direct current system according to claim 1, wherein the signal acquisition module (1) comprises a direct current fault current limiter, an energy absorption branch and a voltage and current signal acquisition, wherein the direct current fault current limiter is used for limiting the direct current fault current of the system, the energy absorption branch is used for absorbing the energy of the fault current, and the voltage and current signal acquisition is used for acquiring signals of current and voltage.

3. The experimental platform for the direct-current system fault current limiting device as claimed in claim 1, wherein the signal conditioning module (2) comprises an operational amplifier module, an A \ D conversion module, an IGBT switch and an IGBT driving module, the operational amplifier module is used for adjusting voltage and analog to digital, so that the operational amplifier module can be matched with the A \ D conversion module, the A \ D conversion module converts an analog signal into a digital signal, the IGBT switch is used for charging and discharging the signal conditioning module (2), and the IGBT driving module is used for driving the IGBT module to start.

4. The experiment platform for the dc system fault current limiting device according to claim 1, wherein the signal processing module (3) comprises a digital signal processing module, an optical fiber converter and a single chip microcomputer module, the digital signal processing module is configured to process the digital signal converted by the signal conditioning module (2), the optical fiber module and the optical fiber converter are configured to transmit the digital signal processed by the signal conditioning module (2) to the single chip microcomputer module, and the single chip microcomputer module is configured to process the digital signal.

5. The experimental platform for the direct-current system fault current limiting device according to claim 1, wherein the measurement and control center (4) comprises a signal acquisition module, a serial port control module, a measurement and analysis module and a data display and storage module, the signal acquisition module is used for acquiring signals in the whole system, the serial port control module is used for controlling serial port data of each module, the measurement and analysis module is used for measuring and analyzing data in each module, and the data display and storage module is used for displaying and storing the data.

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