CN216356531U - Single-phase variable-speed constant-frequency constant-voltage system - Google Patents
Single-phase variable-speed constant-frequency constant-voltage system Download PDFInfo
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- CN216356531U CN216356531U CN202121434156.2U CN202121434156U CN216356531U CN 216356531 U CN216356531 U CN 216356531U CN 202121434156 U CN202121434156 U CN 202121434156U CN 216356531 U CN216356531 U CN 216356531U
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Abstract
The utility model discloses a single-phase variable-speed constant-frequency constant-voltage system which comprises a circuit breaker, a shaft generator, a frequency converter, a filter, an electric energy metering module, a controller, a first communication module, a second communication module, a man-machine module and a 24V direct-current power supply. The utility model can not only detect parameters such as system output voltage, current, power factor and the like, but also automatically adjust and control the output voltage of the shaft generator according to the bus voltage of the frequency converter so that the bus voltage is stabilized at a set value, thereby the system output voltage is always stabilized, the system can convert the three-phase alternating current of the shaft generator into single-phase alternating current for output, and the output voltage is detected to keep stable through closed-loop control, the system has the function of alarm shutdown protection, and alarm information can be displayed and processed through a human-computer interface to be checked by a user.
Description
Technical Field
The utility model relates to the field of ship shaft generators, in particular to a single-phase variable-speed constant-frequency constant-voltage system.
Background
The shaft generator is driven by a ship main engine, alternating current with voltage and frequency changing along with the rotating speed is output within a certain rotating speed range, and the alternating current is converted into constant voltage and constant frequency by the frequency converter and is output to a load for power supply after being filtered by the sine filter. The voltage of axle area generator is controlled by the voltage regulator, because generator speed range is wider, exciting current is bigger when the low speed, burns out the regulator easily, exciting current is very little when high speed, and generator voltage is difficult to control, burns out the converter easily, and when generator speed was undulant, generator voltage also can follow the fluctuation, leads to system output voltage unstable, can't satisfy the load power consumption demand. The single-phase frequency converter in the market has very low power and cannot meet the power requirement of a single-phase variable-speed constant-frequency constant-voltage power supply with higher power.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides the following technical scheme:
the utility model provides a single-phase variable-speed constant-frequency constant-voltage system,
the constant-frequency and constant-voltage system comprises a shaft generator, a circuit breaker, a frequency converter, a filter, an electric energy metering module, a DC24V power module, a man-machine module, a controller, a buzzer, a K1 relay, a fault indicator lamp, a button, a first communication module, a second communication module and a K2 relay;
the DC24V power supply module is respectively connected with the electric energy metering module, the man-machine module, the controller, the buzzer, the K1 relay, the fault indicator light and the button;
the shaft generator is connected with the circuit breaker, the circuit breaker is connected with the frequency converter, the frequency converter is connected with the filter, one phase of the output end of the filter penetrates through the current transformer, the current transformer is connected with the electric energy metering module, and the output end of the filter is connected with the electric energy metering module;
the frequency converter control loop is connected with an exciter stator and an output U, V, W of the shaft-driven generator, the frequency converter control loop is connected with a K2 relay, and a K2 relay is connected with an auxiliary contact of a circuit breaker;
the second communication module is connected with the first communication module, and the first communication module is connected with the controller;
the frequency converter control loop is in communication connection with the second communication module through ModBus, the electric energy metering module is in communication connection with the second communication module through ModBus, and the human-computer module is connected with the controller Ethernet;
the controller is connected with the button, the K1 relay and the buzzer, and the K1 relay is connected with the fault indicator lamp 11 and the DC24V power module.
Preferably, the shaft generator is a three-phase generator, and the frequency converter converts three-phase alternating current output by the three-phase generator into single-phase alternating current, and then converts the single-phase alternating current into pure sine wave through a single-phase filter and outputs the pure sine wave to supply power to a load.
Preferably, the frequency converter provides an excitation power supply for the shaft generator to enable the shaft generator to normally generate power, and the frequency converter automatically adjusts the excitation current according to the bus voltage, so that the output voltage of the generator is adjusted, and the bus voltage is always stabilized at a set value.
Preferably, the frequency converter can perform static self-learning on parameters of the shaft generator to obtain electromagnetic parameters, and when the motor voltage is unstable due to fluctuation of the rotating speed of the shaft generator, the frequency converter can perform operation matching on the self-learned parameters and keep the motor voltage stable through PID operation regulation.
Preferably, a user can perform excitation and demagnetization operation through the man-machine module or the button so as to control the output of the generator, and when the voltage of the generator reaches a set value, the frequency converter sends a closing signal to the circuit breaker to close the circuit breaker.
Preferably, when the voltage, the current, the frequency and the exciting current of the generator exceed set values, the frequency converter sends a brake-separating signal to the circuit breaker to separate the circuit breaker and generate alarm recording information.
Preferably, the electric energy metering module collects data such as system output voltage, current, frequency, power factor and the like, communicates with the first communication module MODBUS RS485, and transmits the data to the controller.
Preferably, the frequency converter collects the three-phase voltage and frequency of the shaft generator, collects the three-phase current of the generator through a built-in current transformer, communicates with the second communication module MODBUS RS485, and transmits the data of the voltage, the current, the power factor, the excitation voltage, the excitation current and the like of the generator to the controller.
Preferably, the human-computer module is connected with the controller through an ethernet network, and displays data and alarm record information sent to the controller by the frequency converter and the electric energy metering module for a user to check.
Preferably, the controller forms a closed loop by collecting the output voltage of the system, automatically adjusts the output voltage to be stable, and when the output voltage, the current and the frequency of the system are abnormal, the system automatically alarms, stops outputting to the outside and generates alarm record information.
The utility model has the beneficial effects
The utility model can not only detect parameters such as system output voltage, current, power factor and the like, but also automatically adjust and control the output voltage of the shaft generator according to the bus voltage of the frequency converter, so that the bus voltage is stabilized at a set value, and the system output voltage is always stable. The system can convert three-phase alternating current of the shaft generator into single-phase alternating current for output, and detects output voltage to keep the output voltage stable through closed-loop control. The system has the function of alarm shutdown protection, and can display and process alarm information for a user to check through a human-computer interface.
Drawings
Fig. 1 is a working principle diagram of the present invention.
Description of reference numerals: the system comprises a 1-shaft generator, a 2-circuit breaker, a 3-frequency converter, a 4-filter, a 5-electric energy metering module, a 6-DC24V power module, a 7-man-machine module, an 8-controller, a 9-buzzer, a 10-K1 relay, an 11-fault indicator lamp, a 12-button, a 13-first communication module, a 14-second communication module, a 15-K2 relay and a 16-current transformer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, the present invention provides an automatic protection controlled hair shaft system,
the constant-frequency and constant-voltage system comprises a shaft generator 1, a circuit breaker 2, a frequency converter 3, a filter 4, an electric energy metering module 5, a DC24V power module 6, a man-machine module 7, a controller 8, a buzzer 9, a K1 relay 10, a fault indicator lamp 11, a button 12, a first communication module 13, a second communication module 14 and a K2 relay 15.
The DC24V power module 6 is respectively connected with the electric energy metering module 5, the man-machine module 7, the controller 8, the buzzer 9, the K1 relay 10, the fault indicator light 11 and the button 12.
The shaft generator 1 is connected with the circuit breaker 2, the circuit breaker 2 is connected with the frequency converter 3, the frequency converter 3 is connected with the filter 4, the output end of the filter 4 penetrates through the current transformer 16, the current transformer 16 is connected with the electric energy metering module 5, and the output end of the filter 4 is connected with the electric energy metering module 5.
The control loop of the frequency converter 3 is connected with the exciter stator and the output U, V, W of the shaft generator 1, the control loop of the frequency converter 3 is connected with the K2 relay 15, and the K2 relay 15 is connected with the auxiliary contact of the breaker 2.
The second communication module 14 is connected with the first communication module 13, and the first communication module 13 is connected with the controller 8.
The control loop of the frequency converter 3 is in communication connection with the second communication module 14 through ModBus, the electric energy metering module 5 is in communication connection with the second communication module 13 through ModBus, and the man-machine module 7 is in Ethernet connection with the controller 8.
The controller 8 is connected with a button 12, a K1 relay 10 and a buzzer 9, and the K1 relay 10 is connected with a fault indicator lamp 11 and a DC24V power module 6.
When the shaft generator 1 is driven to the running speed range by a ship host, an excitation button on the button 2 is used or an excitation button on the man-machine module 7 is clicked, the frequency converter 3 controls a loop F + and F-terminal to output excitation current to an exciter of the shaft generator 1, the shaft generator 1 normally generates power and outputs three-phase alternating current, when the frequency converter 3 controls the loop to detect that the output voltage of the shaft generator 1 reaches a set value, signals are output to the K2 relay 15 through the control loop R01A and the RO1B, the K2 relay 15 closes an auxiliary contact loop of the circuit breaker 2 to enable the circuit breaker 2, the three-phase alternating current output by the generator enters the frequency converter 3, the three-phase alternating current is rectified into direct current by the frequency converter 3 and then is inverted into single-phase alternating current to be output, and finally is converted into pure sine wave through the closing filter 4 to be output to supply power to a ship load, and the shaft generator 1 still runs, when a constant-frequency constant-voltage system is not needed to supply power to a ship load, the de-excitation button on the button 2 or the de-excitation button on the man-machine module 7 is clicked, the frequency converter 3 controls the loop to turn off excitation output, and the generator stops outputting power outwards and does not generate power.
The frequency converter 3 controls a loop to detect three-phase voltage, frequency and exciting current of the shaft generator 1, detects three-phase current of the shaft generator 1 through an internal current transformer, and when the three-phase voltage, the three-phase current, the frequency and the exciting current exceed set values, the frequency converter 3 controls the loop to turn off exciting current output, so that the shaft generator 1 stops outputting externally, and the shaft generator 1 is protected.
After the frequency converter 3 is started, the frequency converter 3 adjusts the output voltage of the shaft generator 1 by adjusting the exciting current given by the control loop according to the bus voltage, so that the bus voltage of the frequency converter 3 is always stabilized at a set value.
The electric energy metering module 5 detects system output voltage, detects the magnitude of output current through the current transformer 16, calculates system output power, power factor and generated energy, and transmits the electric quantity data to the controller 8 through the ModBus communication with the first communication module.
The control loop of the frequency converter 3 also transmits the current data such as three-phase voltage, three-phase current, frequency, exciting current and the like of the shaft generator 1 to the controller 8 through the ModBus communication with the second communication module.
When the voltage, the current, the frequency and the exciting current of the shaft belt generator 1 are abnormal or the single-phase voltage, the current and the frequency output by the system are abnormal, the controller 8 outputs a signal to the buzzer 9 for alarming, the K1 relay 10 is connected with the DC24V power supply through the K1 relay 10, the fault indicator lamp 11 is on, and the controller 8 sends a stop signal to the frequency converter 3 to stop outputting to the outside.
The controller 8 is connected with the man-machine module 7 through Ethernet communication, the man-machine module 7 displays data transmitted by the electric energy metering module 5 and the control loop of the frequency converter 3 for a user to check, when alarm shutdown occurs, an alarm record can be generated and displayed for the user to check, and the user can conveniently analyze and search reasons.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (6)
1. A single-phase variable-speed constant-frequency constant-voltage system is characterized in that,
the constant-frequency and constant-voltage system comprises a shaft generator, a circuit breaker, a frequency converter, a filter, an electric energy metering module, a DC24V power module, a man-machine module, a controller, a buzzer, a K1 relay, a fault indicator lamp, a button, a first communication module, a second communication module and a K2 relay;
the DC24V power supply module is respectively connected with the electric energy metering module, the man-machine module, the controller, the buzzer, the K1 relay, the fault indicator light and the button;
the shaft generator is connected with the circuit breaker, the circuit breaker is connected with the frequency converter, the frequency converter is connected with the filter, one phase of the output end of the filter penetrates through the current transformer, the current transformer is connected with the electric energy metering module, and the output end of the filter is connected with the electric energy metering module;
the frequency converter control loop is connected with an exciter stator and an output U, V, W of the shaft-driven generator, the frequency converter control loop is connected with a K2 relay, and a K2 relay is connected with an auxiliary contact of a circuit breaker;
the second communication module is connected with the first communication module, and the first communication module is connected with the controller;
the frequency converter control loop is in communication connection with the second communication module through ModBus, the electric energy metering module is in communication connection with the second communication module through ModBus, and the human-computer module is connected with the controller Ethernet;
the controller is connected with the button, the K1 relay and the buzzer, and the K1 relay is connected with the fault indicator lamp (11) and the DC24V power module.
2. The single-phase variable-speed constant-frequency constant-voltage system as claimed in claim 1,
the shaft generator is a three-phase generator, the frequency converter converts three-phase alternating current output by the three-phase generator into single-phase alternating current, and the single-phase alternating current is converted into pure sine waves through the single-phase filter and then output to a load for power supply.
3. The single-phase variable-speed constant-frequency constant-voltage system as claimed in claim 2,
the frequency converter provides an excitation power supply for the shaft generator to enable the shaft generator to normally generate power, and automatically adjusts the excitation current according to the bus voltage, so that the output voltage of the generator is adjusted, and the bus voltage is always stabilized at a set value.
4. The single-phase variable-speed constant-frequency constant-voltage system as claimed in claim 1,
the electric energy metering module collects system output voltage, current, frequency, power and power factor data, communicates with the first communication module MODBUS RS485, and transmits the data to the controller.
5. The single-phase variable-speed constant-frequency constant-voltage system as claimed in claim 1,
the frequency converter collects the three-phase voltage and frequency of the shaft generator, collects the three-phase current of the generator through the built-in current transformer, communicates with the second communication module MODBUS RS485, and transmits the voltage, current, power factor, excitation voltage and excitation current data of the generator to the controller.
6. The single-phase variable-speed constant-frequency constant-voltage system as claimed in claim 1,
the man-machine module is connected with the controller through the Ethernet, and displays the data and the alarm record information of the frequency converter and the electric energy metering module, which are sent to the controller, for a user to check.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121434156.2U CN216356531U (en) | 2021-06-25 | 2021-06-25 | Single-phase variable-speed constant-frequency constant-voltage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121434156.2U CN216356531U (en) | 2021-06-25 | 2021-06-25 | Single-phase variable-speed constant-frequency constant-voltage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216356531U true CN216356531U (en) | 2022-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121434156.2U Active CN216356531U (en) | 2021-06-25 | 2021-06-25 | Single-phase variable-speed constant-frequency constant-voltage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216356531U (en) |
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2021
- 2021-06-25 CN CN202121434156.2U patent/CN216356531U/en active Active
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