CN112834835B - Line sequence detection method for impact-free grid connection of generator - Google Patents
Line sequence detection method for impact-free grid connection of generator Download PDFInfo
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- CN112834835B CN112834835B CN201911155861.6A CN201911155861A CN112834835B CN 112834835 B CN112834835 B CN 112834835B CN 201911155861 A CN201911155861 A CN 201911155861A CN 112834835 B CN112834835 B CN 112834835B
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- G01—MEASURING; TESTING
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- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
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Abstract
The invention relates to a line sequence detection method for impact-free grid connection of a generator, which comprises the following steps: a generator to be connected to the grid and a primary nuclear phase of a system; performing primary and secondary synchronization phase checking on the generator to be connected to the grid and a synchronous voltage loop; testing and analyzing the synchronous process. The generator non-impact grid-connected line sequence detection method provided by the invention utilizes the synchronous display and storage functions of the two ports of the dual-trace oscilloscope, so that the nuclear phase is more visual, the data is more accurate and the archiving and storage are convenient. Meanwhile, the condition that the nuclear phase is judged by mistake due to the fact that the nuclear phase precision cannot be mastered because the transmission is uniform and the secondary synchronous nuclear phase is connected by an interphone is avoided.
Description
Technical Field
The invention relates to a line sequence detection method for impact-free grid connection of a generator, and belongs to the technical field of detection and debugging of power systems.
Background
The primary side voltage and the secondary side voltage of the generator have the correct phase sequence at the same time, and the primary condition of the safe grid connection of the generator is that. Therefore, the problem of phase checking of a voltage loop after starting of the generator can be involved before the new generator (or generator transformer set) is put into operation, after primary or secondary equipment related to the generator (or generator transformer set) is modified and after the automatic quasi-synchronization device is replaced and modified. The nuclear phase generally comprises two methods, the first method is a zero-lifting-voltage secondary side nuclear phase with an empty bus of a generator in the same system, but the method is limited by the structure and the operation mode of a primary system and cannot be implemented, even if the method is available, a large amount of switching operation is required, and the risks of switching operation errors and single-bus operation power loss exist. The second method is that the primary side and the secondary side of different systems simultaneously carry out nuclear phase checking, but the method cannot be carried out due to the limitation of a field environment space or the fact that the primary voltage is more than 35KV, even if the method is feasible, the risk of electric shock exists due to the fact that a person touches the primary voltage, in addition, whether a primary nuclear phase instrument and a secondary synchronous meter synchronously rotate to a high point and a low point or not needs to be confirmed through an interphone during the nuclear phase checking, and the possibility of erroneous judgment of the nuclear phase exists because the interphone cannot be synchronously connected, and the nuclear phase precision cannot be mastered.
After the primary side voltage and the secondary side voltage of the generator are correct in phase, the generator can not be guaranteed to be connected to the grid without impact, and a non-synchronous grid-connection accident can be caused seriously, so that the system and the generator to be connected to the grid generate very large current impact at the moment of parallel connection, the generator, a circuit breaker and other equipment are easily damaged, and the stability of the whole system is greatly influenced. Three conditions, namely the pressure difference and the frequency difference between the system side voltage and the generator side voltage are in an allowable range, and the phase angle difference is 0, are required to be met for realizing the impact-free grid connection of the generator. Therefore, in order to ensure the reasonability and the accuracy of the setting value of the automatic quasi-synchronization device and the accuracy of synchronous closing, the minimum impact current of the generator during synchronous closing is realized, and a pseudo-synchronization test is required. In China, a special multi-channel wave recording device is generally used for collecting and analyzing data in the synchronization process, and the detection wiring is complex and the cost performance is low. In addition, the method for measuring more than two electric quantities by the dual-trace oscilloscope is realized by utilizing the precedence relationship of current waveforms of all loops in the synchronization process and the principle that the current quantities can be superposed in a current clamp, an important setting value 'switch-on time' required in a synchronization device can be accurately obtained by recording and storing the waveforms, and whether a generator grid-connected switch is switched on in place at the moment that the phase angle difference is 0 can be judged through the recorded waveforms.
Disclosure of Invention
The invention aims to solve the technical problems that: the method overcomes the defects of the technology, and provides a simple, economical, safe and effective detection method for performing primary and secondary nuclear phases by using a dual-trace oscilloscope without adjusting the operation mode of a primary system.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a line sequence detection method for impact-free grid connection of a generator comprises the following steps:
(1) connecting a probe A of an oscilloscope input port A with the output of a generator U-phase voltage sensor, connecting a probe B with the output of a system side U-phase voltage sensor, connecting a probe C of the oscilloscope input port B with the output of a generator V-phase voltage sensor, connecting a probe D with the output of the system side V-phase voltage sensor, checking whether two waveforms displayed by the oscilloscope are the same or not, and recording and storing a waveform diagram;
(2) connecting a probe A of an oscilloscope input port A with the output of a generator U-phase voltage sensor, connecting a probe B with the output of a system side U-phase voltage sensor, connecting a probe C of the oscilloscope input port B with the output of a generator W-phase voltage sensor, connecting a probe D with the output of the system side W-phase voltage sensor, checking whether two waveforms displayed by the oscilloscope are the same or not, and recording and storing a waveform diagram;
(3) connecting a probe A of an input port A of the oscilloscope with the output of a V-phase voltage sensor of the generator, connecting a probe B with the output of a V-phase voltage sensor at the system side, connecting a probe C of an input port B of the oscilloscope with the output of a W-phase voltage sensor of the generator, connecting a probe D with the output of the W-phase voltage sensor at the system side, checking whether two waveforms displayed by the oscilloscope are the same or not, and recording and storing a waveform diagram;
(4) if the two waveforms displayed by the oscillograph in the steps (1), (2) and (3) are inconsistent and have a difference of 120 degrees, the outlet bus voltage sequence of the generator is not correct, namely the primary wiring is wrong;
(5) the voltage loop of the synchronous device is respectively connected with any one phase and the other phase of the secondary voltage of the motor and the system side: the input end 1 of the voltage conversion device is connected to one phase of the secondary voltage of the generator collected by the voltage loop of the synchronous device, and the input end 2 of the voltage conversion device is connected to the other phase of the secondary voltage of the generator collected by the voltage loop of the synchronous device; connecting an input end 3 of a voltage conversion device to one phase of the system side secondary voltage collected by a voltage loop of the synchronous device, and connecting an input end 4 of the voltage conversion device to the other phase of the system side secondary voltage collected by the voltage loop of the synchronous device; connecting a probe C of an input port B of the oscilloscope with an output end 5 of the voltage conversion device, and connecting a probe D with an output end 6 of the voltage conversion device; connecting a probe A of an input port A of the oscilloscope with the output of a voltage sensor of a secondary voltage phase of the generator, and connecting a probe B with the output of a voltage sensor of a system side phase; checking whether the two waveform phases displayed by the oscilloscope are consistent or not, and recording and storing a waveform diagram; if the two waveform phases displayed by the oscilloscope are not consistent, the wiring error of the voltage loop of the synchronous device and the secondary voltage of the generator or the external loop of the secondary voltage of the system is indicated;
(6) connecting an input end 1 of a voltage conversion device to a secondary voltage U phase of the generator collected by a synchronous device; connecting an input end 2 of the voltage conversion device to a secondary voltage W phase of the generator collected by the synchronous device; connecting an input end 3 of the voltage conversion device to a system side secondary voltage U phase acquired by a synchronization device; connecting an input end 4 of the voltage conversion device to a system side secondary voltage W phase acquired by a synchronous device; connecting a probe A of an input port A of the oscilloscope with an output end 5 of the voltage conversion device, and connecting a probe B with an output end 6 of the voltage conversion device; measuring the current of a synchronous closing loop and a grid-connected switch auxiliary contact signal acquisition loop by using a current clamp, and connecting an output port of the current clamp into an input port B end of an oscilloscope; and then performing a false synchronous switching-on test of the generator, recording and storing the waveform by an oscilloscope, judging whether the grid-connected switch of the generator is switched on at the time when the phase angle difference is 0 or not from the waveform, and if the grid-connected switch of the generator is switched on at the time when the phase angle difference is 0, passing the synchronous test.
The scheme is further improved in that: in the step (6), the oscilloscope input port a records slip voltage waveforms, the lowest point of the waveforms is the time when the phase angle difference is 0, the point where one of the slip voltage waveforms is the lowest point and the grid-connected switch should be switched on in place is defined as time T3, the second waveform appearing in the current waveforms recorded by the oscilloscope input port B is the current waveform in the grid-connected switch auxiliary contact signal acquisition loop, the time when the waveform reaches the maximum value after appearing is defined as time T4 when the main contact of the grid-connected switch is switched on in place, and if T3 is consistent with T4, it can be determined that the generator grid-connected switch is switched on in place at the time when the phase angle difference is 0.
The generator non-impact grid-connected line sequence detection method provided by the invention utilizes the synchronous display and storage functions of the two ports of the dual-trace oscilloscope, so that the nuclear phase is more visual, the data is more accurate and the archiving and storage are convenient. Meanwhile, the condition that the nuclear phase is judged by mistake due to the fact that the nuclear phase precision cannot be mastered because the transmission is uniform and the secondary synchronous nuclear phase is connected by an interphone is avoided. In addition, the method for measuring more than two electric quantities by the dual-trace oscilloscope is realized by utilizing the precedence relationship of current waveforms of all loops in the synchronization process and the principle that the current quantities can be superposed in a current clamp, an important setting value 'switch-on time' required in a synchronization device can be accurately obtained by recording and storing the waveforms, and whether a generator grid-connected switch is switched on in place at the moment that the phase angle difference is 0 can be judged through the recorded waveforms.
Drawings
The invention will be further explained with reference to the drawings.
Fig. 1 is a schematic diagram of primary nuclear phase connection of a generator to be grid-connected and a system in a preferred embodiment of the invention.
Fig. 2 is a schematic structural diagram of a voltage conversion device.
Fig. 3 is a schematic diagram of primary and secondary synchronous nuclear phase wiring of a generator to be connected to the grid and a synchronous voltage loop in a preferred embodiment of the invention.
Fig. 4 is a waveform diagram of a test of a pseudo-simultaneous closing test process in a preferred embodiment of the present invention.
Detailed Description
Examples
The line sequence detection method for the impact-free grid connection of the generator comprises the following steps:
firstly, a generator to be connected to a grid and a primary nuclear phase of a system. The nuclear phase test wiring is shown in fig. 1, 1) a probe A of an input port A of an oscilloscope is connected with the output of a U-phase voltage sensor of a generator, a probe B is connected with the output of the U-phase voltage sensor at the system side, a probe C of the input port B of the oscilloscope is connected with the output of a V-phase voltage sensor of the generator, and a probe D is connected with the output of the V-phase voltage sensor at the system side. And checking that the two waveforms displayed by the oscilloscope are the same, and recording and storing the oscillogram. 2) The probe A of the oscilloscope input port A is connected with the output of the generator U phase voltage sensor, the probe B is connected with the output of the system side U phase voltage sensor, the probe C of the oscilloscope input port B is connected with the output of the generator W phase voltage sensor, and the probe D is connected with the output of the system side W phase voltage sensor. And checking that the two waveforms displayed by the oscilloscope are the same, and recording and storing the oscillogram. 3) The probe A of the input port A of the oscilloscope is connected with the output of the generator V-phase voltage sensor, the probe B is connected with the output of the system side V-phase voltage sensor, the probe C of the input port B of the oscilloscope is connected with the output of the generator W-phase voltage sensor, and the probe D is connected with the output of the system side W-phase voltage sensor. And checking that the two waveforms displayed by the oscilloscope are the same, and recording and storing the oscillogram. In the above test, if two waveforms displayed by the oscilloscope are not consistent and have a phase difference of 120 °, it indicates that the outlet bus voltage sequence of the generator is not correct, i.e. the primary side wiring is incorrect.
And secondly, performing primary and secondary synchronous phase checking on the generator to be connected to the grid and the synchronous voltage loop. For the convenience of description, it is assumed that the voltage loop connections of the contemporaneous devices are both U-phase and W-phase, and the actual test connections should be determined based on the voltage loop of the contemporaneous device in the field. The nuclear phase test wiring is as shown in fig. 3, and an input end 1 of the voltage conversion device is connected in parallel with a secondary voltage U phase of the generator collected by the synchronous device; connecting the input end 2 of the voltage conversion device with the secondary voltage W of the generator collected by the synchronous device in parallel; connecting an input end 3 of the voltage conversion device with a system side secondary voltage U collected by a synchronization device in parallel; connecting an input end 4 of the voltage conversion device with a system side secondary voltage W acquired by the synchronization device in parallel; connecting a probe C of an input port B of the oscilloscope with an output end 5 of the voltage conversion device, and connecting a probe D with an output end 6 of the voltage conversion device; and connecting a probe A of an input port A of the oscilloscope with the output of a U-phase voltage sensor of the generator, and connecting a probe B with the output of the U-phase voltage sensor at the system side. And checking that the two waveforms displayed by the oscilloscope enter a valley point and a peak point at the same time, and recording and storing the oscillogram. If the two waveform phases displayed by the oscillograph are not consistent, the wiring errors of the external circuits of the secondary voltage of the generator and the secondary voltage of the system side collected by the synchronous device are shown, and the wiring needs to be checked and adjusted. The structure of the voltage conversion device is shown in fig. 2.
And thirdly, testing and analyzing the synchronous process. Connecting an input end 1 of a voltage conversion device with a secondary voltage U of the generator collected by a synchronous device in parallel; connecting the input end 2 of the voltage conversion device with the secondary voltage W of the generator collected by the synchronous device in parallel; connecting an input end 3 of the voltage conversion device with a system side secondary voltage U collected by a synchronous device in parallel; converting voltageThe device input end 4 is connected in parallel with the system side secondary voltage W collected by the synchronous device. And connecting a probe A of an input port A of the oscilloscope with an output end 5 of the voltage conversion device, and connecting a probe B with an output end 6 of the voltage conversion device. And simultaneously measuring the current magnitude of a synchronous closing circuit and a grid-connected switch auxiliary contact signal acquisition circuit in the false synchronization process of the generator by using a current clamp jaw, and connecting an output port of the current clamp to an input port B end of an oscilloscope. Firstly, a generator is subjected to a false synchronization closing test, and an oscilloscope records and stores a waveform. Second, the recorded waveform is analyzed. Now the following analysis is made in conjunction with FIG. 4: the method comprises the steps that a sliding voltage waveform is recorded at an input port A of an oscilloscope, the lowest point of the waveform is the time when the phase angle difference is 0, the point where the lowest point of one sliding voltage waveform and a grid-connected switch are required to be switched on in place is determined as time T3, the second waveform appearing in the current waveform recorded at the input port B of the oscilloscope is the current waveform in a signal acquisition loop of an auxiliary contact of the grid-connected switch, the time when the waveform reaches the maximum value after appearing is the time T4 when a main contact of the grid-connected switch is switched on in place, and if the T3 is very close to the T4, the fact that the grid-connected switch of the generator is switched on in place at the time when the phase angle difference is 0 can be judged. If the deviation between T3 and T4 is large, the setting error of the 'switch closing time' which is a very important and key setting value in the synchronous device is possible, and the accurate switch closing time Tk can be obtained through two current waveforms recorded by the input port B of the oscilloscope, and the 'switch closing time' setting value in the synchronous device is corrected according to the accurate switch closing time Tk. The first waveform appearing in the current waveform recorded by the input port B of the oscilloscope is the current waveform in a 'synchronous closing loop', the moment when the waveform begins to appear is the moment T2 when a synchronous device sends a synchronous closing instruction, and according to the moment T4 when the main contact of the grid-connected switch is closed in place, the accurate switch closing time Tk can be obtained,
。
in conclusion, the invention does not need to adjust the operation mode of a primary system, uses a wide range of dual-trace oscilloscopes to carry out primary and secondary nuclear phases of the generator and the system, and also uses the dual-trace oscilloscopes to carry out acquisition and analysis of multi-electric quantity data in the synchronous process of the generator so as to achieve the aims of simple, economical, safe and effective debugging and testing, thereby really ensuring no impact grid connection of the generator, fully ensuring stable production and being worthy of popularization and application.
The present invention is not limited to the above-described embodiments. All technical solutions formed by adopting equivalent substitutions fall into the protection scope claimed by the invention.
Claims (2)
1. A line sequence detection method for impact-free grid connection of a generator is characterized by comprising the following steps:
(1) connecting a probe A of an oscilloscope input port A with the output of a generator U-phase voltage sensor, connecting a probe B with the output of a system side U-phase voltage sensor, connecting a probe C of the oscilloscope input port B with the output of a generator V-phase voltage sensor, connecting a probe D with the output of the system side V-phase voltage sensor, checking whether two waveforms displayed by the oscilloscope are the same or not, and recording and storing a waveform diagram;
(2) connecting a probe A of an oscilloscope input port A with the output of a generator U-phase voltage sensor, connecting a probe B with the output of a system side U-phase voltage sensor, connecting a probe C of the oscilloscope input port B with the output of a generator W-phase voltage sensor, connecting a probe D with the output of the system side W-phase voltage sensor, checking whether two waveforms displayed by the oscilloscope are the same or not, and recording and storing a waveform diagram;
(3) connecting a probe A of an input port A of the oscilloscope with the output of a V-phase voltage sensor of the generator, connecting a probe B with the output of a V-phase voltage sensor at the system side, connecting a probe C of an input port B of the oscilloscope with the output of a W-phase voltage sensor of the generator, connecting a probe D with the output of the W-phase voltage sensor at the system side, checking whether two waveforms displayed by the oscilloscope are the same or not, and recording and storing a waveform diagram;
(4) if the two waveforms displayed by the oscillograph in the steps (1), (2) and (3) are inconsistent and have a difference of 120 degrees, the outlet bus voltage sequence of the generator is incorrect, namely the first wiring is wrong;
(5) the voltage loop of the synchronous device is respectively connected with any one phase and the other phase of the secondary voltage of the generator and the system side: the input end 1 of the voltage conversion device is connected to one phase of the secondary voltage of the generator collected by the voltage loop of the synchronous device, and the input end 2 of the voltage conversion device is connected to the other phase of the secondary voltage of the generator collected by the voltage loop of the synchronous device; connecting an input end 3 of a voltage conversion device to one phase of the system side secondary voltage collected by a voltage loop of the synchronous device, and connecting an input end 4 of the voltage conversion device to the other phase of the system side secondary voltage collected by the voltage loop of the synchronous device; connecting a probe C of an input port B of the oscilloscope with an output end 5 of the voltage conversion device, and connecting a probe D with an output end 6 of the voltage conversion device; connecting a probe A of an input port A of the oscilloscope with the output of a voltage sensor of a secondary voltage phase of the generator, and connecting a probe B with the output of a voltage sensor of a system side phase; checking whether the two waveform phases displayed by the oscilloscope are consistent or not, and recording and storing a waveform diagram; if the two waveform phases displayed by the oscilloscope are not consistent, the connection error of the voltage loop of the synchronous device and the secondary voltage of the generator or the external loop of the secondary voltage at the system side is indicated;
(6) connecting an input end 1 of a voltage conversion device to a secondary voltage U phase of the generator collected by a synchronous device; connecting an input end 2 of the voltage conversion device to a secondary voltage W phase of the generator collected by the synchronous device; connecting an input end 3 of the voltage conversion device to a system side secondary voltage U phase acquired by a synchronization device; connecting an input end 4 of the voltage conversion device to a system side secondary voltage W phase acquired by a synchronous device; connecting a probe A of an input port A of the oscilloscope with an output end 5 of the voltage conversion device, and connecting a probe B with an output end 6 of the voltage conversion device; measuring the current of a synchronous closing loop and a grid-connected switch auxiliary contact signal acquisition loop by using a current clamp, and connecting an output port of the current clamp into an input port B end of an oscilloscope; and then performing a false synchronous switching-on test of the generator, recording and storing the waveform by an oscilloscope, judging whether the grid-connected switch of the generator is switched on at the time when the phase angle difference is 0 or not from the waveform, and if the grid-connected switch of the generator is switched on at the time when the phase angle difference is 0, passing the synchronous test.
2. The generator no-impact grid connection line sequence detection method according to claim 1, characterized by comprising the following steps: in the step (6), the oscilloscope input port a records slip voltage waveforms, the lowest point of the waveforms is the time when the phase angle difference is 0, the point where one of the slip voltage waveforms is the lowest point and the grid-connected switch should be switched on in place is defined as time T3, the second waveform appearing in the current waveforms recorded by the oscilloscope input port B is the current waveform in the grid-connected switch auxiliary contact signal acquisition loop, the time when the waveform reaches the maximum value after appearing is defined as time T4 when the main contact of the grid-connected switch is switched on in place, and if T3 is consistent with T4, it can be determined that the generator grid-connected switch is switched on in place at the time when the phase angle difference is 0.
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