CN113267686A - Method for detecting performance of low-voltage complete reactive power compensation device - Google Patents
Method for detecting performance of low-voltage complete reactive power compensation device Download PDFInfo
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- CN113267686A CN113267686A CN202011402594.0A CN202011402594A CN113267686A CN 113267686 A CN113267686 A CN 113267686A CN 202011402594 A CN202011402594 A CN 202011402594A CN 113267686 A CN113267686 A CN 113267686A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a method for detecting the performance of a low-voltage complete reactive power compensation device, which relates to the technical field of reactive power compensation of power distribution networks and comprises a control center, a network switch, a line signal acquisition module and a reactive signal generation standard source, wherein the network switch is connected with the reactive signal generation standard source, the line signal acquisition module, a switch switching signal acquisition module, a detection module and a secondary false alarm prevention module through network cables, the network switch is connected with the reactive signal generation standard source, the line signal acquisition module, the switch switching signal acquisition module, the detection module and the secondary false alarm prevention module through the network cables, a detection signal is extracted from a circuit to be detected through a signal extraction module of a detection module, the normal work of the circuit to be detected cannot be influenced, and in order to reduce the load effect of the test circuit on the device, the detection circuit adopts a high-impedance isolation design.
Description
Technical Field
The invention relates to the technical field of reactive power compensation of power distribution networks, in particular to a method for detecting the performance of a low-voltage complete reactive power compensation device.
Background
Maintaining the balance of reactive power in the power system is a necessary condition for ensuring the power quality and the voltage quality of the power system, reducing the loss of the power grid and safely and stably operating the system, and the reactive power compensation is an important measure for realizing the reactive power balance of the power grid. The reactive power compensation device has the functions of improving the power factor of a user, increasing the load capacity of a power grid, reducing the line loss, stabilizing the voltage level of a system and improving the quality of electric energy, and is generally used in an electric power system. However, the low-voltage reactive power compensation devices suitable for the power distribution network in the existing market are various in types and mixed in fish and dragon, functional performances of products are different, and the low-voltage reactive power compensation devices are mostly installed outdoors, so that the working environment is severe and faults are easy to occur.
In order to ensure that the low-voltage reactive power compensation device runs safely, reliably and stably, judgment needs to be made on the functions and performances of the compensation device such as switching accuracy, switching mode, dynamic response and switching precision and whether the actual influence of the device on a power grid can reach an expected target after the device is put into the power grid, the device can be retested due to errors in machine detection in the running process, field detection work cannot be carried out according to the actual condition of the power distribution network and related technical requirements, and the use efficiency of the whole compensation device is greatly reduced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for detecting the performance of a complete low-voltage reactive power compensation device, which solves the problems that the low-voltage reactive power compensation devices suitable for a power distribution network in the existing market are various in types, mixed in fish and dragon, uneven in functional performance of products, and the low-voltage reactive power compensation devices are mostly installed outdoors, so that the working environment is severe and faults are easy to occur. In order to ensure that the low-voltage reactive power compensation device runs safely, reliably and stably, the switching accuracy, switching mode, dynamic response, switching precision and other functions and performances of the compensation device and whether the actual influence of the device on the power grid can reach the expected target after the device is put into the power grid need to be judged, and the device may need to be retested due to errors in machine detection in the running process, and the problem of field detection work needs to be carried out according to the actual situation of the power distribution network and related technical requirements.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a method for detecting the performance of a low-voltage complete reactive power compensation device comprises the following steps:
s1, generating a signal by the reactive signal generation standard source, acquiring the signal by the line signal acquisition module by the reactive signal generation standard source, and transmitting the acquired electric signal to the control center through the network switch;
s2, the control center transmits the signals to the line signal acquisition module, and the line signal acquisition module detects the signals;
the signal process in S3 and S2 can realize the detection of various functions of the reactive power compensation device to be detected by a switch switching signal acquisition module and observing the state and switching sequence of a capacitor switching switch, wherein the various functions comprise a switching function, an overvoltage protection function, a voltage loss protection function, a phase loss protection function, a harmonic protection function, a zero-crossing switching function, a control mode, a cyclic switching function, a display function, a self-checking reset function and the like;
signals in S4 and S3 are secondarily detected through a secondary false alarm prevention module, so that detection errors of a line signal acquisition module are prevented;
s5, detecting the passing signal by the secondary false alarm prevention module to obtain data, and if the passing signal does not pass the secondary false alarm prevention module, returning to S2 for re-detection;
the control center is in telecommunication connection with the network switch through a network cable, the network switch is in telecommunication connection with the reactive signal generation standard source, the line signal acquisition module, the switch switching signal acquisition module, the detection module, the secondary false alarm prevention module and other modules through the network cable, and the control center is in telecommunication connection with the printer through a serial port line.
Preferably, the following components: the reactive signal generation standard source comprises a current signal output module, a wave recording module, a voltage signal output module and a communication module.
Preferably, the current signal output module and the voltage signal output module are respectively connected with a line current signal acquisition module and a line voltage signal acquisition module of the tested low-voltage complete reactive power compensation device by adopting copper wires, and the switch switching signal acquisition module is connected with a capacitor switching switch of the tested low-voltage complete reactive power compensation device by adopting copper wires.
Preferably, the detection module comprises a signal extraction module, a signal analysis module and a fault display module.
Preferably, the line signal acquisition module is connected with a sensor installed on an operation line by a copper wire.
Preferably, the secondary false alarm prevention module is connected with the detection module through a copper wire.
Preferably, the sensor is a power sensor, the power sensor adopts a special power conversion circuit to convert an alternating current power signal into a standard direct current voltage signal in a linear relation with the alternating current power signal, and the standard direct current voltage signal is linearly amplified by active filtering to output a constant current or constant voltage analog quantity, so that the transmitter has the characteristics of high precision, stable work and the like and outputs a constant current or constant signal. And the power signal can be output in pulses.
Preferably, the display screen of the fault display module is a 5-inch liquid crystal display screen.
Preferably, the secondary false alarm prevention module is provided with an alarm warning lamp.
(III) advantageous effects
The invention provides a method for detecting the performance of a low-voltage complete reactive power compensation device. The method has the following beneficial effects:
(1) according to the method for detecting the performance of the low-voltage complete reactive power compensation device, the detection signal is extracted from the circuit to be detected through the signal extraction module of the detection module, the normal work of the circuit to be detected cannot be influenced, and the detection circuit adopts a high-impedance isolation design for reducing the load effect of the test circuit on the device.
(2) According to the detection method for the performance of the low-voltage complete reactive power compensation device, the secondary false alarm prevention module is used for preventing errors caused by circuit detection when the device is detected, and then the detection module is restarted to perform secondary detection on the device.
Detailed Description
All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention provides a technical scheme that: a method for detecting the performance of a low-voltage complete reactive power compensation device comprises the following steps:
s1, generating a signal by the reactive signal generation standard source, acquiring the signal by the line signal acquisition module by the reactive signal generation standard source, and transmitting the acquired electric signal to the control center through the network switch;
s2, the control center transmits the signals to the line signal acquisition module, and the line signal acquisition module detects the signals;
the signal process in S3 and S2 can realize the detection of various functions of the reactive power compensation device to be detected by a switch switching signal acquisition module and observing the state and switching sequence of a capacitor switching switch, wherein the various functions comprise a switching function, an overvoltage protection function, a voltage loss protection function, a phase loss protection function, a harmonic protection function, a zero-crossing switching function, a control mode, a cyclic switching function, a display function, a self-checking reset function and the like;
signals in S4 and S3 are secondarily detected through a secondary false alarm prevention module, so that detection errors of a line signal acquisition module are prevented;
s5, detecting the passing signal by the secondary false alarm prevention module to obtain data, and if the passing signal does not pass the secondary false alarm prevention module, returning to S2 for re-detection;
the control center is in telecommunication connection with the network switch through a network cable, the network switch is in telecommunication connection with the reactive signal generation standard source, the line signal acquisition module, the switch switching signal acquisition module, the detection module, the secondary false alarm prevention module and other modules through the network cable, and the control center is in telecommunication connection with the printer through a serial port cable.
Further, the reactive signal generation standard source comprises a current signal output module, a wave recording module, a voltage signal output module and a communication module.
Furthermore, the current signal output module and the voltage signal output module are respectively connected with a line current signal acquisition module and a line voltage signal acquisition module of the tested low-voltage complete reactive power compensation device by adopting copper wires, and the switch switching signal acquisition module is connected with a capacitor switching switch of the tested low-voltage complete reactive power compensation device by adopting copper wires.
Further, the detection module comprises a signal extraction module, a signal analysis module and a fault display module.
Furthermore, the line signal acquisition module is connected with a sensor arranged on the running line by a copper wire.
Further, the secondary false alarm prevention module is connected with the detection module through a copper wire.
Furthermore, the sensor is a power sensor, the power sensor adopts a special power conversion circuit to convert an alternating current power signal into a standard direct current voltage signal in a linear relation with the alternating current power signal, and then the standard direct current voltage signal is linearly amplified by active filtering to output a constant current or constant voltage analog quantity, so that the transmitter has the characteristics of high precision, stable work and the like and outputs a constant current or constant signal. And the power signal can be output in pulses.
Furthermore, the display screen of the fault display module is a 5-inch liquid crystal display screen.
Further, the secondary false alarm prevention module is provided with an alarm warning lamp.
During testing, according to the control physical quantity (reactive power, reactive current, power factor or the combination of two or more physical quantities) selected by the tested low-voltage complete reactive power compensation device and the preset threshold value of the reactive power compensation device, the server sets different test schemes, controls the reactive signal generation standard source to generate various characteristic waveforms of the distribution line in an analog mode through issuing various instructions, simultaneously records the waveforms generated in the analog mode by the wave recording module of the standard source, the current and voltage signal outputs of the standard source are respectively connected with the current and voltage acquisition module of the tested reactive power compensation device, and various functions (switching function, overvoltage protection function, voltage loss protection function, open-phase protection function, harmonic protection function and switching sequence) of the tested reactive power compensation device are realized through observing the state and switching sequence of the switching switch of the capacitor, Zero-crossing switching function, control mode, cyclic switching function, display function, self-checking reset function and the like). Meanwhile, the reactive signal generation standard source can output various high-precision input analog quantities (current and voltage signal quantities) for detecting the sampling precision of the reactive compensation device to be detected; when the characteristic quantity of the reactive signal generation standard source analog distribution line reaches the input threshold or the cut-off threshold of the reactive compensation device controller, the switching switch acts, the action result is sent to the server through the switch switching signal acquisition module, and the action result is combined with the characteristic waveform of the analog output recorded by the wave recording module of the standard source for analysis so as to detect the performance of the reactive compensation device to be detected, such as dynamic response time, action error, sensitivity and the like. Through the line condition fed back by the line signal acquisition module, the improvement condition of the reactive compensation device capacitor bank on the power factor, the electric energy quality and the like of the actual power distribution network after the reactive compensation device capacitor bank is put into or cut off can be analyzed, and the secondary false alarm prevention module starts the device to prevent the situation that the deviation is irradiated to generate errors on the device detection during the secondary detection.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method for detecting the performance of a low-voltage complete reactive power compensation device is characterized by comprising the following steps: the method for detecting the performance of the low-voltage complete reactive power compensation device comprises the following steps of:
s1, generating a signal by the reactive signal generation standard source, acquiring the signal by the line signal acquisition module by the reactive signal generation standard source, and transmitting the acquired electric signal to the control center through the network switch;
s2, the control center transmits the signals to the line signal acquisition module, and the line signal acquisition module detects the signals;
the signal process in S3 and S2 can be detected by a switch switching signal acquisition module by observing the state and switching sequence of a capacitor switching switch, and the various functions of the detected reactive power compensation device are detected, wherein the various functions comprise a switching function, an overvoltage protection function, a voltage loss protection function, a phase loss protection function, a harmonic protection function, a zero-crossing switching function, a control mode, a cyclic switching function, a display function, a self-checking resetting function and the like;
signals in S4 and S3 are secondarily detected through a secondary false alarm prevention module, so that detection errors of a line signal acquisition module are prevented;
s5, detecting the passing signal by the secondary false alarm prevention module to obtain data, and returning to S2 to detect again if the passing signal does not pass;
the control center is in telecommunication connection with the network switch through a network cable, the network switch is in telecommunication connection with modules such as a reactive signal generation standard source, a line signal acquisition module, a switch switching signal acquisition module, a detection module and a secondary false alarm prevention module through the network cable, and the control center is in telecommunication connection with the printer through a serial port line.
2. The method for detecting the performance of the low-voltage complete reactive power compensation device according to claim 1, wherein the method comprises the following steps: the reactive signal generation standard source comprises a current signal output module, a wave recording module, a voltage signal output module and a communication module.
3. The method for detecting the performance of the low-voltage complete reactive power compensation device according to claim 2, wherein the method comprises the following steps: the current signal output module and the voltage signal output module are respectively connected with a line current signal acquisition module and a line voltage signal acquisition module of the tested low-voltage complete reactive power compensation device through copper wires, and the switch switching signal acquisition module is connected with a capacitor switching switch of the tested low-voltage complete reactive power compensation device through copper wires.
4. The method for detecting the performance of the low-voltage complete reactive power compensation device according to claim 1, wherein the method comprises the following steps: the detection module comprises a signal extraction module, a signal analysis module and a fault display module.
5. The method for detecting the performance of the low-voltage complete reactive power compensation device according to claim 3, wherein the method comprises the following steps: and the line signal acquisition module is connected with a sensor arranged on an operation line by adopting a copper wire.
6. The method for detecting the performance of the low-voltage complete reactive power compensation device according to claim 1, wherein the method comprises the following steps: and the secondary false alarm prevention module is connected with the detection module through a copper wire.
7. The method for detecting the performance of the low-voltage complete reactive power compensation device according to claim 5, wherein the method comprises the following steps: the sensor is a power sensor, the power sensor adopts a special power conversion circuit to convert an alternating current power signal into a standard direct current voltage signal in linear relation with the alternating current power signal, and then the standard direct current voltage signal is linearly amplified through active filtering to output a constant current or constant voltage analog quantity, so that the transmitter has the characteristics of high precision, stable work and the like, outputs a constant current or constant signal, and can output the power signal in a pulse mode.
8. The method for detecting the performance of the low-voltage complete reactive power compensation device according to claim 4, wherein the method comprises the following steps: the display screen of trouble display module is 5 cun liquid crystal display.
9. The method for detecting the performance of the low-voltage complete reactive power compensation device according to claim 1, wherein the method comprises the following steps: and the secondary false alarm prevention module is provided with an alarm warning lamp.
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