CN211206623U - System for realizing phase synchronization detection of power frequency signals between discrete nodes - Google Patents

Abstract

The utility model discloses a realize power frequency signal phase synchronization detecting system between discrete node. Belonging to the technical field of phase synchronization detection of power frequency signals between discrete nodes. The wireless communication technology is used for realizing the phase synchronization monitoring of the discrete signals to improve the current situation that the existing monitoring method and system are difficult to sample and analyze, so that the distributed nodal installation is convenient to realize, the centralized control is convenient, and the maintenance is more convenient. The device comprises a current signal generator A, a current signal generator B, a current signal acquisition device and a current signal processing device; the current signal processing device comprises a controller, a data analysis host, a first wireless module and a voice prompter, wherein the data analysis host, the first wireless module and the voice prompter are respectively connected with the controller; the current signal acquisition device comprises a first signal change-over switch, a second signal change-over switch, a first current transformer, a second current transformer, a first current acquisition module, a second wireless module, a main control chip, a B1 node and a B2 node.

Description

System for realizing phase synchronization detection of power frequency signals between discrete nodes

Technical Field

The utility model relates to a power frequency signal phase synchronization detection technical field between the discrete node especially relates to a realize power frequency signal phase synchronization detection system and monitoring method between discrete node.

Background

At present, the electric power industry generally uses a wired communication technology or gives GPS synchronous second pulse to carry out phase synchronization detection, and the detection scheme of the wired communication has the defects that the measuring equipment is complex, the measurement and the diagnosis of the dielectric loss angle are difficult, whether the phase difference between different nodes meets the regulation or not can not be accurately judged, the influence degree of a GPS satellite is high, the material cost is high, and the like.

Monitoring devices on the market at present are based on leakage current monitoring, and collection system decentralized nodal installation, voltage, the difficult centralized detection of electric current signal.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a solve the not enough of unable accurate judgement phase difference between different nodes whether accord with the regulation when power frequency signal phase synchronization detects between the discrete node of present electric power industry, provide one kind and realize discrete signal phase synchronization monitoring through wireless communication technology and improve the current situation that current monitoring method and system sampling analysis are difficult, be convenient for realize the nodal installation of dispersion, be convenient for centralized control, it is more convenient to maintain, power frequency signal phase synchronization detecting system between the discrete node of a realization that system reliability is good.

The technical problem is solved by the following technical scheme:

a system for realizing the phase synchronization detection of power frequency signals among discrete nodes comprises a current signal generator A, a current signal generator B, a current signal acquisition device and a current signal processing device;

the current signal processing device comprises a controller, a data analysis host and a first wireless module, wherein the data analysis host and the first wireless module are respectively connected with the controller;

the current signal acquisition device comprises a first signal change-over switch, a second signal change-over switch, a first current transformer, a second current transformer, a first current acquisition module, a second wireless module, a main control chip, a node B1 and a node B2;

the control end of the current signal generator A, the control end of the current signal generator B, the control end of the first signal change-over switch, the control end of the second signal change-over switch, the first current acquisition module, the second current acquisition module and the second wireless module are respectively connected with a main control chip; the main control chip is in wireless connection with the controller through a second wireless module and a first wireless module;

the A1 node and the A2 node are arranged on the current loop A of the current signal generator A at intervals;

the node B1 and the node B2 are arranged on the current loop B of the current signal generator B at intervals;

the knife edge a of the first signal switch is electrically connected to the node A1 through a first lead;

the knife edge B of the first signal switch is electrically connected to the node B1 through a second lead;

the knife edge a of the second signal change-over switch is electrically connected to the node A2 through a third conducting wire;

the knife edge B of the second signal change-over switch is electrically connected to the node B2 through a fourth conducting wire;

the knife switch end of the first signal change-over switch is electrically connected with the knife switch end of the second signal change-over switch through a fifth wire;

a primary side winding end Z1 of the first current transformer is connected to the second wire, and a current collecting end of the first current collecting module is connected to a secondary side winding end Z2 of the first current transformer;

the primary side winding end Z1 of the second current transformer is connected to the fifth wire, and the current collecting end of the second current collecting module is connected to the secondary side winding end Z2 of the second current transformer.

The scheme improves the current situation that the existing monitoring method and system are difficult to sample and analyze by realizing the phase synchronous monitoring of the discrete signals through the wireless communication technology, is convenient to realize the dispersed node installation, is convenient to centrally control, is more convenient to maintain and has good system reliability.

Preferably, the first current transformer and the second current transformer are both composite transformers with identical circuit structures, each composite transformer comprises a primary winding end Z1, a secondary winding end Z2, a capacitor C1, a capacitor C2 and a ground end, one end of the capacitor C1 and one end of the capacitor C2 are both connected to the secondary winding end Z2, the other end of the capacitor C1 is connected to the primary winding end Z1, and the other end of the capacitor C2 and the secondary winding end Z2 are both connected to the ground end.

Preferably, the first signal change-over switch comprises a first shading box, a first motor, a first knife receiving edge a1, a knife receiving edge b1, a first knife switch, a first light source, a first light sensor, a second light sensor, a first reflector and a second reflector which are respectively arranged in the first shading box;

the base of the first motor is fixed on the inner cavity wall of the first shading box, the tool apron of the first knife switch is fixedly connected to the rotating shaft of the first motor in an insulating way, and the first knife switch can be independently and conductively connected to the knife receiving port a1 or the knife receiving port b1 respectively under the driving of the rotating shaft of the first motor;

the second signal change-over switch comprises a second shading box, a second motor, a receiving knife edge a2, a receiving knife edge b2, a second knife switch, a second light source, a third light sensor, a fourth light sensor, a third reflector and a fourth reflector which are respectively arranged in the second shading box;

the base of the second motor is fixed on the inner cavity wall of the second shading box, the tool apron of the second knife switch is fixedly connected to the rotating shaft of the second motor in an insulating way, and the second knife switch can be independently and conductively connected to the knife receiving opening a2 or the knife receiving opening b2 under the driving of the rotating shaft of the second motor;

the control end of the first motor and the control end of the second motor are respectively connected with the main control chip.

The structure of the first signal change-over switch and the second signal change-over switch is convenient for judging whether the first signal change-over switch and the second signal change-over switch are abnormal or not, and the reliability of the system is improved.

When the first optical sensor detects an optical signal, whether the third optical sensor detects the optical signal is judged, and if the first optical sensor detects the optical signal, the third optical sensor does not detect the optical signal, which indicates that the second signal change-over switch is abnormal.

Similarly, when the second optical sensor detects the optical signal, it is determined whether the fourth optical sensor detects the optical signal, and if the second optical sensor detects the optical signal, the fourth optical sensor does not detect the optical signal, which indicates that the fourth signal switch is abnormal. If the light signal is detected by the second light sensor and the light signal is also detected by the fourth light sensor, the second signal switch is normal, and the second knife switch is located at the switched knife edge b 2.

A monitoring method for realizing a phase synchronization detection system of a power frequency signal between discrete nodes comprises a wireless synchronization calibration realization process, wherein the wireless synchronization calibration realization process comprises the following steps:

firstly, connecting and transmitting the same signal between two current acquisition modules, and respectively sampling and calculating to obtain phase differences phi 1 'and phi 2' between the pulse rising edge of an asynchronous current waveform and the pulse rising edge of a synchronous asynchronous current waveform; the data analysis host receives the phase difference data, analyzes and calculates to obtain the phase difference delta phi between the two current acquisition modules caused by external factors, namely phi 1 '-phi 2', and obtains an average value as a calibration value after multiple synchronous calibrations;

then different signals are transmitted between the two current acquisition modules, phase difference data between the pulse rising edge of the asynchronous current waveform and the pulse rising edge of the synchronous current waveform are obtained through sampling and operation respectively, the phase difference data are sent to a data analysis host to be analyzed, the analysis result is compared with a calibration value, whether the phase difference data meet the requirements or not is judged, and therefore the problem of phase synchronization monitoring between nodes is achieved.

Preferably, the monitoring method further includes a discrete signal phase synchronization monitoring implementation process, where the discrete signal phase synchronization monitoring implementation process is as follows:

the data analysis host is connected with the current acquisition module through a Zigbee wireless communication technology, the data analysis host is used as a main node, and the current acquisition module is used as a slave node; an IRQ pin of the main node receives the rising edge jump of the square wave, the main node wirelessly broadcasts and sends information of a ready synchronization port number, and the slave node enters a ready receiving synchronization state; after delaying 40uS, the master node sends out a synchronization command in a wireless way and each slave node receives the synchronization command;

firstly, connecting two current acquisition modules with the same signal to perform waveform measurement, sending a wireless synchronous signal by a data analysis host in a broadcast mode, receiving a corresponding synchronous wave signal by each current acquisition module, and comparing the waveform of a current transformer with the rising edge of a synchronous wave pulse to obtain a phase; the current acquisition module sends the waveform data and the phase data to a data analysis host, and the data analysis host calculates a calibration phase difference delta phi between different current acquisition modules;

then connecting the two current acquisition modules with different signals respectively to perform waveform measurement, sending a wireless synchronous signal by the data analysis host in a broadcasting manner again, calculating the phase difference between the current waveform and the rising edge of the synchronous pulse by the current acquisition modules through sampling and operation, and transmitting the waveform data and the phase data back to the data analysis host; the data analysis host calculates to obtain the phase difference between the two current acquisition modules and compares the phase difference with a calibration value so as to realize the phase synchronous monitoring between the nodes;

each module of the data online acquisition system in the high-voltage 220kV transformer substation supplies 5V or 3.3V of power, the communication distance ensures 2km (38400bps), an external SMA antenna or a PCB antenna is adopted to realize the broadcast mode sending of data, master-slave communication is carried out according to a target address, the point-to-point data communication function is realized, an external micro control unit MCU sends a maximum data packet 1044Byte of a Zigbee module, and the data buffer of Zigbee is required to be more than 1044 bytes; the module can be flexibly arranged, can be conveniently configured into a main node or a slave node, and can be preferably configured into a routing node; the serial port speed is 9600-38400 bps, and the data bit is 8bit, the stop bit is 1bit, and the check bit is none;

the frequency range of Zigbee is 2.405 GHz-2.480 GHz, the wireless channel is 16, the receiving sensitivity is-94 dBm, the Zigbee power consumption is extremely low, the transmitting power is-27 dBm-25 dBm, the sleep power saving is controlled within 0.11mA, or the current is controlled within 1mA in a reset state for a long time, and the sleep can be controlled through an IO port or sleep and timed wake-up through a communication protocol.

The wireless synchronization function realized by the scheme is as follows:

1. the IO pin of the wireless transmitting node (master node) is set to be high level, and the IO pin of the corresponding receiving node (slave node) outputs a high level.

2. The time for transmitting the master node signal to the slave node signal is not required, the transmission response time can be mS level, the same pins of all the slave node modules simultaneously output square waves, and the time error between the square waves does not exceed 1 microsecond (the rising edge and the falling edge of the waveform).

3. If the master node sends out a high-level edge, three slave nodes A, B, C in 1mS synchronously output high levels, the mutual time errors of the rising edges of the three slave nodes outputting the high levels are controlled to be less than 0.25uS, 0.25uS corresponds to a 50Hz power frequency phase of 0.0045 degrees, the precision is high, and the performance is comparable to the GPS second pulse phase synchronization level.

4. The wireless transceiving module sends a question and answer instruction every other period under the control of the MCU controller, the acquisition module reports a measurement data packet every other period according to the instruction, the MCU controller analyzes the measurement data according to the format of the data packet after receiving the data packet, judges whether the measurement data is a rising edge measurement value at the same moment, and the analysis host processes and calculates the phase difference after the judgment.

The utility model discloses can reach following effect:

the utility model discloses a wireless communication technology realizes that discrete signal phase place synchronous monitoring improves the current situation that current monitoring method and system sampling analysis are difficult, is convenient for realize the nodal installation of dispersion, and the centralized control of being convenient for maintains more conveniently, and system reliability is good.

Drawings

Fig. 1 is a schematic diagram of a system circuit principle connection structure of the present invention.

Fig. 2 is the utility model discloses a user state connection structure sketch map when the light of a light source is reflected to a light sensor by a speculum on, the light of No. two light sources is reflected to No. three light sensors on by No. three speculums.

Fig. 3 is a schematic view of the utility model showing a connection structure of the first light source in a use state when the light is reflected by the second reflector to the second light sensor and the light of the second light source is reflected by the fourth reflector to the fourth light sensor.

Fig. 4 is a partially enlarged schematic view of the signal-to-signal switch in fig. 2.

Fig. 5 is a schematic diagram illustrating a level between level phase differences of a master node and a slave node implementing a wireless synchronization function.

Fig. 6 is a schematic block diagram of the connection between the first motor and the second motor and the main control chip.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

In an embodiment, a system for implementing phase synchronization detection of a power frequency signal between discrete nodes is shown in fig. 1 to 6. The device comprises a current signal generator A, a current signal generator B, a current signal acquisition device and a current signal processing device;

the current signal processing device comprises a controller, a data analysis host and a first wireless module, wherein the data analysis host and the first wireless module are respectively connected with the controller;

the current signal acquisition device comprises a first signal change-over switch, a second signal change-over switch, a first current transformer, a second current transformer, a first current acquisition module, a second wireless module, a main control chip, a node B1 and a node B2;

the control end of the current signal generator A, the control end of the current signal generator B, the control end of the first signal change-over switch, the control end of the second signal change-over switch, the first current acquisition module, the second current acquisition module and the second wireless module are respectively connected with a main control chip; the main control chip is in wireless connection with the controller through a second wireless module and a first wireless module;

the A1 node and the A2 node are arranged on the current loop A of the current signal generator A at intervals;

the node B1 and the node B2 are arranged on the current loop B of the current signal generator B at intervals;

the knife edge a of the first signal switch is electrically connected to the node A1 through a first lead;

the knife edge B of the first signal switch is electrically connected to the node B1 through a second lead;

the knife edge a of the second signal change-over switch is electrically connected to the node A2 through a third conducting wire;

the knife edge B of the second signal change-over switch is electrically connected to the node B2 through a fourth conducting wire;

the knife switch end of the first signal change-over switch is electrically connected with the knife switch end of the second signal change-over switch through a fifth wire;

a primary side winding end Z1 of the first current transformer is connected to the second wire, and a current collecting end of the first current collecting module is connected to a secondary side winding end Z2 of the first current transformer;

the primary side winding end Z1 of the second current transformer is connected to the fifth wire, and the current collecting end of the second current collecting module is connected to the secondary side winding end Z2 of the second current transformer.

The first current transformer and the second current transformer are composite transformers with completely identical circuit structures, each composite transformer comprises a primary winding end Z1, a secondary winding end Z2, a capacitor C1, a capacitor C2 and a grounding end, one end of the capacitor C1 and one end of the capacitor C2 are connected to the secondary winding end Z2, the other end of the capacitor C1 is connected to the primary winding end Z1, and the other end of the capacitor C2 and the secondary winding end Z2 are connected to the grounding end.

The first signal change-over switch comprises a first shading box, a first motor, a receiving knife edge a1, a receiving knife edge b1, a first switch blade, a first light source, a first light sensor, a second light sensor, a first reflector and a second reflector which are respectively arranged in the first shading box;

the base of the first motor is fixed on the inner cavity wall of the first shading box, the tool apron of the first knife switch is fixedly connected to the rotating shaft of the first motor in an insulating way, and the first knife switch can be independently and conductively connected to the knife receiving port a1 or the knife receiving port b1 respectively under the driving of the rotating shaft of the first motor;

the second signal change-over switch comprises a second shading box, a second motor, a receiving knife edge a2, a receiving knife edge b2, a second knife switch, a second light source, a third light sensor, a fourth light sensor, a third reflector and a fourth reflector which are respectively arranged in the second shading box;

the base of the second motor is fixed on the inner cavity wall of the second shading box, the tool apron of the second knife switch is fixedly connected to the rotating shaft of the second motor in an insulating way, and the second knife switch can be independently and conductively connected to the knife receiving opening a2 or the knife receiving opening b2 under the driving of the rotating shaft of the second motor;

the control end of the first motor and the control end of the second motor are respectively connected with the main control chip.

A monitoring method for realizing a phase synchronization detection system of a power frequency signal between discrete nodes comprises a wireless synchronization calibration realization process, wherein the wireless synchronization calibration realization process comprises the following steps:

firstly, connecting and transmitting the same signal between two current acquisition modules, and respectively sampling and calculating to obtain 1 'and phi 2' in the phase difference between the pulse rising edge of the asynchronous current waveform and the pulse rising edge of the synchronous asynchronous current waveform; the data analysis host receives the phase difference data, analyzes and calculates to obtain the phase difference delta phi between the two current acquisition modules caused by external factors, namely phi 1 '-phi 2', and obtains an average value as a calibration value after multiple synchronous calibrations;

then different signals are transmitted between the two current acquisition modules, phase difference data between the pulse rising edge of the asynchronous current waveform and the pulse rising edge of the synchronous current waveform are obtained through sampling and operation respectively, the phase difference data are sent to a data analysis host to be analyzed, the analysis result is compared with a calibration value, whether the phase difference data meet the requirements or not is judged, and therefore the problem of phase synchronization monitoring between nodes is achieved.

The monitoring method also comprises a discrete signal phase synchronization monitoring implementation process, wherein the discrete signal phase synchronization monitoring implementation process comprises the following steps:

the data analysis host is connected with the current acquisition module through a Zigbee wireless communication technology, the data analysis host is used as a main node, and the current acquisition module is used as a slave node; an IRQ pin of the main node receives the rising edge jump of the square wave, the main node wirelessly broadcasts and sends information of a ready synchronization port number, and the slave node enters a ready receiving synchronization state; after delaying 40uS, the master node sends out a synchronization command in a wireless way and each slave node receives the synchronization command;

firstly, connecting two current acquisition modules with the same signal to perform waveform measurement, sending a wireless synchronous signal by a data analysis host in a broadcast mode, receiving a corresponding synchronous wave signal by each current acquisition module, and comparing the waveform of a current transformer with the rising edge of a synchronous wave pulse to obtain a phase; the current acquisition module sends the waveform data and the phase data to a data analysis host, and the data analysis host calculates a calibration phase difference delta phi between different current acquisition modules;

then connecting the two current acquisition modules with different signals respectively to perform waveform measurement, sending a wireless synchronous signal by the data analysis host in a broadcasting manner again, calculating the phase difference between the current waveform and the rising edge of the synchronous pulse by the current acquisition modules through sampling and operation, and transmitting the waveform data and the phase data back to the data analysis host; the data analysis host calculates to obtain the phase difference between the two current acquisition modules and compares the phase difference with a calibration value so as to realize the phase synchronous monitoring between the nodes;

each module of the data online acquisition system in the high-voltage 220kV transformer substation supplies 5V or 3.3V of power, the communication distance ensures 2km (38400bps), an external SMA antenna or a PCB antenna is adopted to realize the broadcast mode sending of data, master-slave communication is carried out according to a target address, the point-to-point data communication function is realized, an external micro control unit MCU sends a maximum data packet 1044Byte of a Zigbee module, and the data buffer of Zigbee is required to be more than 1044 bytes; the module can be flexibly arranged, can be conveniently configured into a main node or a slave node, and can be preferably configured into a routing node; the serial port speed is 9600-38400 bps, and the data bit is 8bit, the stop bit is 1bit, and the check bit is none;

the frequency range of Zigbee is 2.405 GHz-2.480 GHz, the wireless channel is 16, the receiving sensitivity is-94 dBm, the Zigbee power consumption is extremely low, the transmitting power is-27 dBm-25 dBm, the sleep power saving is controlled within 0.11mA, or the current is controlled within 1mA in a reset state for a long time, and the sleep can be controlled through an IO port or sleep and timed wake-up through a communication protocol.

The wireless synchronization function is realized as follows:

1. the IO pin of the wireless transmitting node (master node) is set to be high level, and the IO pin of the corresponding receiving node (slave node) outputs a high level.

2. The time for transmitting the master node signal to the slave node signal is not required, the transmission response time can be mS level, the same pins of all the slave node modules simultaneously output square waves, and the time error between the square waves does not exceed 1 microsecond (the rising edge and the falling edge of the waveform).

3. If the master node sends out a high-level edge, three slave nodes A, B, C in 1mS synchronously output high levels, the mutual time errors of the rising edges of the three slave nodes outputting the high levels are controlled to be less than 0.25uS, 0.25uS corresponds to a 50Hz power frequency phase of 0.0045 degrees, the precision is high, and the performance is comparable to the GPS second pulse phase synchronization level.

4. The wireless transceiving module sends a question and answer instruction every other period under the control of the MCU controller, the acquisition module reports a measurement data packet every other period according to the instruction, the MCU controller analyzes the measurement data according to the format of the data packet after receiving the data packet, judges whether the measurement data is a rising edge measurement value at the same moment, and the analysis host processes and calculates the phase difference after the judgment.

The method for synchronously detecting the discrete signal phase of the wireless communication technology can monitor the current transformer through the sensor at high precision, has synchronous phase detection, and has the advantages of low time delay, low power consumption, reliable transmission, 1Mbps transmission rate and the like in the Zigbee wireless technology. The requirements of decentralized installation and centralized control are met.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and those skilled in the art can make various changes or modifications within the scope of the appended claims.

Claims (1)

1. A system for realizing the phase synchronization detection of power frequency signals among discrete nodes is characterized by comprising a current signal generator A, a current signal generator B, a current signal acquisition device and a current signal processing device;

the current signal processing device comprises a controller, a data analysis host and a first wireless module, wherein the data analysis host and the first wireless module are respectively connected with the controller;

the current signal acquisition device comprises a first signal change-over switch, a second signal change-over switch, a first current transformer, a second current transformer, a first current acquisition module, a second wireless module, a main control chip, a node B1 and a node B2;

the control end of the current signal generator A, the control end of the current signal generator B, the control end of the first signal change-over switch, the control end of the second signal change-over switch, the first current acquisition module, the second current acquisition module and the second wireless module are respectively connected with a main control chip; the main control chip is in wireless connection with the controller through a second wireless module and a first wireless module;

the A1 node and the A2 node are arranged on the current loop A of the current signal generator A at intervals;

the node B1 and the node B2 are arranged on the current loop B of the current signal generator B at intervals;

the knife edge a of the first signal switch is electrically connected to the node A1 through a first lead;

the knife edge B of the first signal switch is electrically connected to the node B1 through a second lead;

the knife edge a of the second signal change-over switch is electrically connected to the node A2 through a third conducting wire;

the knife edge B of the second signal change-over switch is electrically connected to the node B2 through a fourth conducting wire;

the knife switch end of the first signal change-over switch is electrically connected with the knife switch end of the second signal change-over switch through a fifth wire;

a primary side winding end Z1 of the first current transformer is connected to the second wire, and a current collecting end of the first current collecting module is connected to a secondary side winding end Z2 of the first current transformer;

the primary side winding end Z1 of the second current transformer is connected to the fifth wire, and the current collecting end of the second current collecting module is connected to the secondary side winding end Z2 of the second current transformer.

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