CN110907740A - Automatic commutation equipment detection device and method based on PWM converter - Google Patents
Automatic commutation equipment detection device and method based on PWM converter Download PDFInfo
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Abstract
The invention relates to a PWM converter-based automatic commutation equipment detection device and method, and belongs to the technical field of equipment detection. The detection device comprises a PWM converter, a field controller, a wireless handheld terminal and a three-phase symmetrical load; the field controller comprises a converter control module, a data analysis module, a phase selector receiving module, a control chip and a first radio frequency signal transceiving module; the wireless handheld terminal comprises a microprocessor, a touch liquid crystal display screen, a second radio frequency signal transceiving module and the like. The invention provides a detection approach for the performance of the current low-voltage automatic phase-changing equipment through the automatic phase-changing equipment detection device and method based on the PWM converter, and avoids the condition that the low-voltage automatic phase-changing equipment is put into use on the premise that the performance of the low-voltage automatic phase-changing equipment is unknown, thereby avoiding the loss caused by the need of cutting off the power supply of a user for the field test and maintenance of the equipment after the equipment is put into use and potential safety operation hidden dangers.
Description
Technical Field
The invention belongs to the technical field of equipment detection, and particularly relates to a PWM converter-based automatic commutation equipment detection device and method.
Background
Currently, the low-voltage distribution network in China mostly supplies power to users in a three-phase four-wire system mode through a 10kV/0.4kV transformer. However, almost all low voltage distribution networks suffer from three-phase imbalance due to user dispersion and load diversity and random cut-in. The three-phase imbalance problem can cause line loss in a power grid and copper loss and iron loss of a transformer to increase, and even can reduce the output of the transformer, thereby affecting the normal supply of electric energy, reducing the quality of the electric energy and damaging the safe operation of a system and the safe power utilization of users.
In order to solve the problem, the manual line changing load adjusting mode is really feasible, but is neither safe nor economical, so that the low-voltage automatic commutation load balancing equipment is applied to a power grid in a large scale to realize automatic adjustment and treatment of the three-phase imbalance problem. However, the low-voltage automatic commutation load balancing equipment which is put into use at present has the problems of insufficient regulation capacity, low accuracy, high failure rate and the like, and brings a lot of economic losses to power grids and power utilization enterprises. In addition, when the automatic commutation load balancing equipment is put into operation on site, the automatic commutation load balancing equipment is often required to be tested in the aspects of performance and the like in a power failure state, so that the power failure range of a user is expanded, and some electric shock risks are brought to field operators.
Therefore, it is highly desirable to invent a detection device for a low-voltage automatic commutation load balancing device, so that before the low-voltage automatic commutation load balancing device is put into use, the performance of the device can be tested, and a certain reference basis is provided for whether the device is put into use and for improving the performance of the device.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a device and a method for detecting automatic commutation equipment based on a PWM converter so as to realize the detection of the performance of the current low-voltage automatic commutation load balancing equipment.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an automatic commutation equipment detection device based on a PWM converter comprises a phase selector and a phase line switching box, wherein the phase selector and the phase line switching box are connected in parallel into an ABC three-phase circuit of a three-phase four-wire system; the phase selector is connected with the phase line switching box and is used for controlling the work of the phase line switching box;
the detection device comprises a PWM converter, a field controller, a wireless handheld terminal and a three-phase symmetrical load;
the PWM converter comprises an uncontrolled bridge rectifier, a direct current capacitor and a three-phase four-bridge arm inverter;
ABC three phases in a three-phase four-wire system of the low-voltage distribution network are used as the input of an uncontrolled bridge rectifier, the output of the uncontrolled bridge rectifier is connected with a direct current capacitor, and then alternating current is output through a three-phase four-leg inverter to supply three-phase symmetrical loads;
the field controller comprises a converter control module, a data analysis module, a phase selector receiving module, a control chip and a first radio frequency signal transceiving module;
the converter control module is connected with the PWM converter and used for controlling the action of a switching device in the three-phase four-bridge arm inverter;
the phase selector receiving module is connected with the phase selector and used for receiving the three-phase current real-time detection value sent by the phase selector;
the control chip is respectively connected with the converter control module, the data analysis module, the phase selector receiving module and the first radio frequency signal transceiving module, is used for controlling the converter control module, the data analysis module, the phase selector receiving module and the first radio frequency signal transceiving module to work, and is also used for controlling the real-time detection value of the three-phase current received by the phase selector receiving module to be sent to the data analysis module and controlling the analysis result of the data analysis module to be sent to the wireless handheld terminal through the first radio frequency signal transceiving module;
and the data analysis module is used for carrying out data processing analysis on the received three-phase current real-time detection value.
Further, preferably, the wireless handheld terminal comprises a microprocessor, a touch liquid crystal display screen and a second radio frequency signal transceiving module;
the second radio frequency signal transceiver module is wirelessly connected with the first radio frequency signal transceiver module;
the microprocessor is respectively connected with the touch liquid crystal display screen and the second radio frequency signal transceiver module and is used for controlling the touch liquid crystal display screen and the second radio frequency signal transceiver module to work;
the touch liquid crystal display screen is used for inputting the three-phase unbalanced voltage and the unbalanced degree threshold value, sending the three-phase unbalanced voltage and the unbalanced degree threshold value to the field controller through the second radio frequency signal receiving and sending module, and is also used for displaying an analysis result of the data analysis module.
Further, preferably, the wireless handheld terminal further comprises a buzzer and a signal lamp; the microprocessor is respectively connected with the buzzer and the signal lamp and is used for controlling the buzzer and the signal lamp to work.
The invention also provides a detection method of the automatic commutation equipment based on the PWM converter, and the detection device of the automatic commutation equipment based on the PWM converter comprises the following steps:
s1: inputting a three-phase current unbalance threshold:
inputting a three-phase current unbalance threshold to a field controller through a wireless handheld terminal;
s2: inputting preset three-phase unbalanced voltage and an unbalanced value to generate a three-phase current unbalanced value:
the wireless handheld terminal sends three-phase unbalanced voltage and an unbalanced degree threshold value to the field controller, the converter control module sends a three-phase unbalanced voltage control signal to the three-phase four-leg inverter according to a received instruction, a preset three-phase voltage unbalanced value can be any value which is larger than the threshold value and smaller than 100%, and the three-phase unbalanced voltage output by the three-phase four-leg inverter acts on a three-phase symmetrical load to generate three-phase unbalanced current and an unbalanced degree value;
s3: collecting three-phase current in real time, and carrying out imbalance value calculation and analysis:
the phase selector collects three-phase unbalanced current in real time, analyzes and generates a real-time adjustment scheme according to the three-phase unbalanced current, generates a phase line switching box switching adjustment instruction and transmits the phase line switching adjustment instruction to the phase line switching box;
s4: the phase line switching box receives the action signal and carries out load adjustment and switching:
the phase line change-over switch box receives a control signal from the phase selector, performs phase line change-over, accesses a load corresponding to a phase line, and adjusts a three-phase current unbalance value;
s5: acquiring the adjusted three-phase current, and carrying out imbalance value calculation analysis:
the phase selector is used for transmitting the adjusted three-phase current to the field controller, and a data analysis module of the field controller analyzes the collected three-phase unbalanced current and calculates the three-phase current unbalanced value;
s6: comparing the adjusted three-phase current imbalance value with a threshold value, and analyzing the detection result:
comparing the adjusted three-phase current unbalance value with a three-phase current unbalance threshold, if the three-phase current unbalance value adjusted by the automatic phase-changing equipment is smaller than a set threshold, judging that the detection result is qualified, otherwise, judging that the detection result is unqualified, and transmitting the detection result to a wireless handheld terminal by using a radio frequency signal;
further, it is preferable that the threshold value of the unbalance degree of the three-phase currents is 20%.
Further, preferably, the method further comprises a power-on self-test step, specifically as follows:
after the automatic commutation equipment and the detection device are powered on, checking whether the communication of each part of the equipment is normal; firstly, locking a phase line switching box, sending a three-phase symmetrical voltage control signal to a three-phase four-bridge arm inverter by a detection person through a wireless handheld terminal, observing whether three-phase current is symmetrical, and if so, indicating that the wireless handheld terminal and a PWM converter work normally; then manually giving a control signal to the phase selector, observing whether the phase line switching box acts according to a given instruction, and if so, ensuring that the phase selector and the phase line switching box work normally; the power-on self-test is passed; and then inputting a three-phase current unbalance threshold.
Further, preferably, the method further comprises a step of displaying the detection result by the wireless handheld terminal, which is specifically as follows:
the wireless handheld terminal receives a detection result from the field controller, three-phase current and three-phase current imbalance values are displayed on a touch liquid crystal display screen of the wireless handheld terminal, if the detection result is qualified, a green light of a signal indicator lamp is turned on, otherwise, a red light of the signal indicator lamp is turned on, and a buzzer gives out sound and gives an alarm.
The purpose of the uncontrolled bridge rectifier is to provide energy for a direct-current capacitor, the three-phase four-leg inverter is used for obtaining three-phase voltages with different amplitudes, when the obtained three-phase asymmetric voltages act on three symmetric loads, three-phase unbalanced currents can be generated, and meanwhile, the structure of the four legs ensures that the three-phase inverter can output the three-phase asymmetric voltages.
The phase selector is mainly used for acquiring ABC three-phase current in a line in real time and generating an automatic current imbalance value adjusting scheme according to the ABC three-phase current, so that an action instruction of the phase line switching box is generated and sent; the phase line switching box is used for switching the phase lines according to the received action instructions, so that the three-phase current imbalance value of the power distribution network can be automatically adjusted in real time.
When the automatic phase-changing equipment is detected, the wireless handheld terminal sends an instruction, the PWM converter acts, the automatic phase-changing equipment is adjusted in real time, the field controller collects information and judges, and the information interaction schematic diagram of the whole detection system is shown in figure 2.
The operation sequence of the device under test and the detection apparatus is shown in fig. 4.
In order to ensure that the detected equipment and the detection device can act orderly in the detection process, the action time sequence of each module is specified. The method comprises the steps of firstly, carrying out power-on self-test on equipment, detecting whether communication of each module of the equipment has a problem, and entering a subsequent device detection program if the communication of each module of the equipment has no problem. Firstly, operating a wireless handheld terminal and sending out a three-phase four-bridge arm inverter control instruction; then the three-phase four-bridge arm inverter acts and outputs three-phase unbalanced voltage according to a control instruction; the phase selector works, three-phase current of the line is collected, imbalance value calculation and analysis are carried out, and a phase line switching box action instruction is generated; the phase line change-over switch box acts according to the instruction to carry out load change-over adjustment; the field controller receives the ABC three-phase current which is transmitted from the phase selector and is automatically adjusted, calculates the unbalance value, and compares the unbalance value with the set current unbalance threshold value to obtain the detection result; the detection result is transmitted to the wireless handheld terminal, the liquid crystal display displays data information, the corresponding indicating lamp is turned on, the buzzer sounds, and the detector records the test result. Then, the next round of detection can be performed, and the respective portions of the device under test and the detection apparatus operate sequentially.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a detection approach for the performance of the current low-voltage automatic commutation equipment through a PWM converter-based automatic commutation equipment detection device and a PWM converter-based automatic commutation equipment detection method; the method avoids the condition that the device is put into use on the premise of unknown performance of the low-voltage automatic commutation device, and further avoids the loss caused by the fact that the power supply of a user is cut off when the device is subjected to field test and maintenance after the device is put into use, and potential safety operation hidden dangers.
The existing detection device and method for low-voltage automatic phase-changing equipment usually adopt a load switching mode to provide a three-phase current imbalance value for tested equipment, although the mode is feasible, frequent switching is required in the testing process, the workload is large, the preset range of the current imbalance value is limited, and certain potential safety hazards exist; the invention adopts the PWM converter, can easily adjust the output voltage of the inverter, can easily realize the preset requirement of the unbalance value of the three-phase current on the premise of unchanged three-phase symmetrical load, and has flexible and controllable output voltage of the inverter, thereby having wider regulation range of the preset value of the unbalance value of the current. On the other hand, the existing detection device and method usually rely on only using one detection control device to analyze the detection result, and because a communication/control line needs to be laid, the detection control device is generally required to be installed on a test site, which has certain potential safety hazard for the operation of detection personnel; the invention adopts a wireless hand-held terminal mode, can easily send a control instruction to the field controller through radio frequency signal receiving and sending, can display the electric information quantity in the detection process in real time through the liquid crystal display screen, and also utilizes peripheral devices such as an indicator light, a buzzer and the like to make the detection result visible and audible, thereby being very friendly to man-machine interaction, reliable in method, simple to implement and convenient to operate. Once the device is put into use, the detection cost and the potential safety hazard can be greatly reduced, and the detection flexibility and the working efficiency are improved.
The three-phase unbalanced current is constructed by adopting the PWM converter, compared with the traditional method of changing the current by switching the load and the like, the method saves a plurality of load switching links, and has simple operation and high reliability; meanwhile, the increase of the PWM converter can prevent the problem of unbalance of the power distribution network during testing.
Due to the controllable characteristic of the power electronic device, the output range of the three-phase unbalanced voltage is wider, compared with the traditional method, the preset values of the unbalanced current values are more various, and the requirement of multiple tests is met.
The invention utilizes the wireless handheld terminal to operate the whole testing process, compared with the traditional method of live testing on site, the testing process is safe and reliable;
the wireless handheld terminal modifies test parameters convenient and fast, is easy to carry out a plurality of times of tests, promotes the reliability of the detection result, and meanwhile, modules such as a wireless handheld terminal accessible liquid crystal display, an indicator light, a buzzer show the detection result in a diversified manner, the detection result is visible and audible, and the man-machine interaction is very friendly. And a wireless handheld terminal mode is adopted, so that field testing personnel can operate in a safe area, and the safety factor is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of an automatic commutation equipment detection device based on a PWM converter;
FIG. 2 is a diagram of information interaction of a detection apparatus according to the present invention;
FIG. 3 is a flow chart of the detection method of the present invention;
FIG. 4 is a timing diagram illustrating the operation of the device under test and the detection apparatus;
wherein, 1, PWM converter; 2. a field controller; 3. a wireless handheld terminal; 4. three-phase symmetrical load; 5. an uncontrolled bridge rectifier; 6. a direct current capacitor; 7. a three-phase four-leg inverter; 8. a phase selector; 9. a phase line switching box; 10. a converter control module; 11. a data analysis module; 12. a phase selector receiving module; 13. a control chip; 14. a first radio frequency signal transceiver module; 15. a microprocessor; 16. a touch liquid crystal display screen; 17. a second radio frequency signal transceiver module; 18. a buzzer; 19. a signal lamp.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
As shown in fig. 1-2, an automatic commutation equipment detection device based on a PWM converter includes a phase selector 8 and a phase switching box 9, where the phase selector 8 and the phase switching box 9 are connected in parallel to an ABC three-phase line of a three-phase four-wire system; the phase selector 8 is connected with the phase line switching box 9 and used for controlling the phase line switching box 9 to work;
the detection device comprises a PWM converter 1, a field controller 2, a wireless handheld terminal 3 and a three-phase symmetrical load 4;
the PWM converter 1 comprises an uncontrolled bridge rectifier 5, a direct current capacitor 6 and a three-phase four-leg inverter 7;
ABC three phases in a three-phase four-wire system of the low-voltage distribution network are used as the input of an uncontrolled bridge rectifier 5, the output of the uncontrolled bridge rectifier 5 is connected with a direct current capacitor 6, and then alternating current is output through a three-phase four-leg inverter 7 to be supplied to a three-phase symmetrical load 4;
the field controller 2 comprises a converter control module 10, a data analysis module 11, a phase selector receiving module 12, a control chip 13 and a first radio frequency signal transceiving module 14;
the converter control module 10 is connected with the PWM converter 1 and used for controlling the action of a switching device in the three-phase four-leg inverter;
the phase selector receiving module 12 is connected with the phase selector 8 and used for receiving the real-time detection value of the three-phase current sent by the phase selector;
the control chip 13 is respectively connected with the converter control module 10, the data analysis module 11, the phase selector receiving module 12 and the first radio frequency signal transceiving module 14, and is used for controlling the converter control module 10, the data analysis module 11, the phase selector receiving module 12 and the first radio frequency signal transceiving module 14 to work, controlling the three-phase current real-time detection value received by the phase selector receiving module 12 to be sent to the data analysis module 11, and controlling the analysis result of the data analysis module 11 to be sent to the wireless handheld terminal 3 through the first radio frequency signal transceiving module 14;
the data analysis module 11 is used for performing data processing analysis on the received three-phase current real-time detection value.
Preferably, the wireless handheld terminal 3 comprises a microprocessor 15, a touch liquid crystal display screen 16 and a second radio frequency signal transceiver module 17;
the second radio frequency signal transceiver module 17 is wirelessly connected with the first radio frequency signal transceiver module 14;
the microprocessor 15 is respectively connected with the touch liquid crystal display screen 16 and the second radio frequency signal transceiver module 17 and is used for controlling the touch liquid crystal display screen 16 and the second radio frequency signal transceiver module 17 to work;
the touch liquid crystal display screen 16 is used for inputting the three-phase unbalanced voltage and the unbalanced threshold value, sending the three-phase unbalanced voltage and the unbalanced threshold value to the field controller 2 through the second radio frequency signal transceiver module 17, and displaying an analysis result of the data analysis module 11.
Preferably, the wireless handheld terminal 3 further comprises a buzzer 18 and a signal lamp 19; the microprocessor 15 is respectively connected with the buzzer 18 and the signal lamp 19 and is used for controlling the work of the buzzer 18 and the signal lamp 19.
As shown in fig. 3, a method for detecting an automatic commutation equipment based on a PWM converter, which uses the above detection apparatus for an automatic commutation equipment based on a PWM converter, includes the following steps:
s1: inputting a three-phase current unbalance threshold:
inputting a three-phase current unbalance threshold to a field controller through a wireless handheld terminal;
s2: inputting preset three-phase unbalanced voltage and an unbalanced value to generate a three-phase current unbalanced value:
the wireless handheld terminal sends three-phase unbalanced voltage and an unbalanced degree threshold value to the field controller, the converter control module sends a three-phase unbalanced voltage control signal to the three-phase four-leg inverter according to a received instruction, a preset three-phase voltage unbalanced value can be any value which is larger than the threshold value and smaller than 100%, and the three-phase unbalanced voltage output by the three-phase four-leg inverter acts on a three-phase symmetrical load to generate three-phase unbalanced current and an unbalanced degree value;
s3: collecting three-phase current in real time, and carrying out imbalance value calculation and analysis:
the phase selector collects three-phase unbalanced current in real time, analyzes and generates a real-time adjustment scheme according to the three-phase unbalanced current, generates a phase line switching box switching adjustment instruction and transmits the phase line switching adjustment instruction to the phase line switching box;
s4: the phase line switching box receives the action signal and carries out load adjustment and switching:
the phase line change-over switch box receives a control signal from the phase selector, performs phase line change-over, accesses a load corresponding to a phase line, and adjusts a three-phase current unbalance value;
s5: acquiring the adjusted three-phase current, and carrying out imbalance value calculation analysis:
the phase selector is used for transmitting the adjusted three-phase current to the field controller, and a data analysis module of the field controller analyzes the collected three-phase unbalanced current and calculates the three-phase current unbalanced value;
s6: comparing the adjusted three-phase current imbalance value with a threshold value, and analyzing the detection result:
comparing the adjusted three-phase current unbalance value with a three-phase current unbalance threshold, if the three-phase current unbalance value adjusted by the automatic phase-changing equipment is smaller than a set threshold, judging that the detection result is qualified, otherwise, judging that the detection result is unqualified, and transmitting the detection result to a wireless handheld terminal by using a radio frequency signal;
preferably, the threshold value of the unbalance degree of the three-phase current is 20%.
Preferably, the method further comprises a power-on self-test step, which is as follows:
after the automatic commutation equipment and the detection device are powered on, checking whether the communication of each part of the equipment is normal; firstly, locking a phase line switching box, sending a three-phase symmetrical voltage control signal to a three-phase four-bridge arm inverter by a detection person through a wireless handheld terminal, observing whether three-phase current is symmetrical, and if so, indicating that the wireless handheld terminal and a PWM converter work normally; then manually giving a control signal to the phase selector, observing whether the phase line switching box acts according to a given instruction, and if so, ensuring that the phase selector and the phase line switching box work normally; the power-on self-test is passed; and then inputting a three-phase current unbalance threshold.
Preferably, the method further comprises the step of displaying the detection result by the wireless handheld terminal, which specifically comprises the following steps:
the wireless handheld terminal receives a detection result from the field controller, three-phase current and three-phase current imbalance values are displayed on a touch liquid crystal display screen of the wireless handheld terminal, if the detection result is qualified, a green light of a signal indicator lamp is turned on, otherwise, a red light of the signal indicator lamp is turned on, and a buzzer gives out sound and gives an alarm.
In order to ensure the reliability of the detection result and eliminate the error caused by one-time detection, a plurality of groups of three-phase unbalanced current preset values can be constructed by setting different three-phase unbalanced voltages, multiple detections are carried out, and the detection results are integrated to obtain whether the detected low-voltage automatic phase-changing equipment is qualified or not.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. An automatic commutation equipment detection device based on a PWM converter comprises a phase selector (8) and a phase line switching box (9), wherein the phase selector (8) and the phase line switching box (9) are connected in parallel into an ABC three-phase line of a three-phase four-wire system; the phase selector (8) is connected with the phase line switching box (9) and is used for controlling the phase line switching box (9) to work; the method is characterized in that:
the system comprises a PWM converter (1), a field controller (2), a wireless handheld terminal (3) and a three-phase symmetrical load (4);
the PWM converter (1) comprises an uncontrolled bridge rectifier (5), a direct current capacitor (6) and a three-phase four-leg inverter (7);
ABC three phases in a three-phase four-wire system of the low-voltage distribution network are used as the input of an uncontrolled bridge rectifier (5), the output of the uncontrolled bridge rectifier (5) is connected with a direct current capacitor (6), and alternating current is output through a three-phase four-leg inverter (7) to be supplied to a three-phase symmetrical load (4);
the field controller (2) comprises a converter control module (10), a data analysis module (11), a phase selector receiving module (12), a control chip (13) and a first radio frequency signal transceiving module (14);
the converter control module (10) is connected with the PWM converter (1) and is used for controlling the action of a switching device in the three-phase four-leg inverter;
the phase selector receiving module (12) is connected with the phase selector (8) and used for receiving the three-phase current real-time detection value sent by the phase selector;
the control chip (13) is respectively connected with the converter control module (10), the data analysis module (11), the phase selector receiving module (12) and the first radio frequency signal transceiving module (14) and is used for controlling the converter control module (10), the data analysis module (11), the phase selector receiving module (12) and the first radio frequency signal transceiving module (14) to work, controlling the three-phase current real-time detection value received by the phase selector receiving module (12) to be sent to the data analysis module (11) and controlling the analysis result of the data analysis module (11) to be sent to the wireless handheld terminal (3) through the first radio frequency signal transceiving module (14);
and the data analysis module (11) is used for carrying out data processing analysis on the received three-phase current real-time detection value.
2. The PWM converter-based automatic commutation apparatus detecting device according to claim 1, wherein: the wireless handheld terminal (3) comprises a microprocessor (15), a touch liquid crystal display screen (16) and a second radio frequency signal transceiving module (17);
the second radio frequency signal transceiving module (17) is wirelessly connected with the first radio frequency signal transceiving module (14);
the microprocessor (15) is respectively connected with the touch liquid crystal display screen (16) and the second radio frequency signal transceiver module (17) and is used for controlling the touch liquid crystal display screen (16) and the second radio frequency signal transceiver module (17) to work;
and the touch liquid crystal display screen (16) is used for inputting the three-phase unbalanced voltage and the unbalanced degree threshold value, sending the three-phase unbalanced voltage and the unbalanced degree threshold value to the field controller (2) through the second radio frequency signal transceiving module (17), and is also used for displaying an analysis result of the data analysis module (11).
3. The PWM converter-based automatic commutation apparatus detecting device according to claim 2, wherein: the wireless handheld terminal (3) also comprises a buzzer (18) and a signal lamp (19); the microprocessor (15) is respectively connected with the buzzer (18) and the signal lamp (19) and is used for controlling the work of the buzzer (18) and the signal lamp (19).
4. A detection method of automatic commutation equipment based on a PWM converter adopts the detection device of the automatic commutation equipment based on the PWM converter, which is characterized by comprising the following steps:
s1: inputting a three-phase current unbalance threshold:
inputting a three-phase current unbalance threshold to a field controller through a wireless handheld terminal;
s2: inputting preset three-phase unbalanced voltage and an unbalanced value to generate a three-phase current unbalanced value:
the wireless handheld terminal sends three-phase unbalanced voltage and an unbalanced degree threshold value to the field controller, the converter control module sends a three-phase unbalanced voltage control signal to the three-phase four-leg inverter according to a received instruction, a preset three-phase voltage unbalanced value can be any value which is larger than the threshold value and smaller than 100%, and the three-phase unbalanced voltage output by the three-phase four-leg inverter acts on a three-phase symmetrical load to generate three-phase unbalanced current and an unbalanced degree value;
s3: collecting three-phase current in real time, and carrying out imbalance value calculation and analysis:
the phase selector collects three-phase unbalanced current in real time, analyzes and generates a real-time adjustment scheme according to the three-phase unbalanced current, generates a phase line switching box switching adjustment instruction and transmits the phase line switching adjustment instruction to the phase line switching box;
s4: the phase line switching box receives the action signal and carries out load adjustment and switching:
the phase line change-over switch box receives a control signal from the phase selector, performs phase line change-over, accesses a load corresponding to a phase line, and adjusts a three-phase current unbalance value;
s5: acquiring the adjusted three-phase current, and carrying out imbalance value calculation analysis:
the phase selector is used for transmitting the adjusted three-phase current to the field controller, and a data analysis module of the field controller analyzes the collected three-phase unbalanced current and calculates the three-phase current unbalanced value;
s6: comparing the adjusted three-phase current imbalance value with a threshold value, and analyzing the detection result:
and comparing the adjusted three-phase current unbalance value with a three-phase current unbalance threshold, if the three-phase current unbalance value adjusted by the automatic phase-changing equipment is smaller than a set threshold, judging that the detection result is qualified, otherwise, judging that the detection result is unqualified, and transmitting the detection result to the wireless handheld terminal by using a radio frequency signal.
5. The PWM converter-based automatic commutation device detection method of claim 4, wherein a three-phase current unbalance threshold is 20%.
6. The PWM converter-based automatic commutation equipment detection method according to claim 4, further comprising a power-on self-test step, specifically as follows:
after the automatic commutation equipment and the detection device are powered on, checking whether the communication of each part of the equipment is normal; firstly, locking a phase line switching box, sending a three-phase symmetrical voltage control signal to a three-phase four-bridge arm inverter by a detection person through a wireless handheld terminal, observing whether three-phase current is symmetrical, and if so, indicating that the wireless handheld terminal and a PWM converter work normally; then manually giving a control signal to the phase selector, observing whether the phase line switching box acts according to a given instruction, and if so, ensuring that the phase selector and the phase line switching box work normally; the power-on self-test is passed; and then inputting a three-phase current unbalance threshold.
7. The PWM converter-based automatic commutation equipment detection method according to claim 4, further comprising a step of displaying a detection result by a wireless handheld terminal, specifically comprising the following steps:
the wireless handheld terminal receives a detection result from the field controller, three-phase current and three-phase current imbalance values are displayed on a touch liquid crystal display screen of the wireless handheld terminal, if the detection result is qualified, a green light of a signal indicator lamp is turned on, otherwise, a red light of the signal indicator lamp is turned on, and a buzzer gives out sound and gives an alarm.
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| CN201911277805.XA CN110907740A (en) | 2019-12-12 | 2019-12-12 | Automatic commutation equipment detection device and method based on PWM converter |
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