CN215934756U - Generator control circuit and thermal power generation device - Google Patents
Generator control circuit and thermal power generation device Download PDFInfo
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- CN215934756U CN215934756U CN202121550700.XU CN202121550700U CN215934756U CN 215934756 U CN215934756 U CN 215934756U CN 202121550700 U CN202121550700 U CN 202121550700U CN 215934756 U CN215934756 U CN 215934756U
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Abstract
The utility model discloses a generator control circuit and a thermal power generation device, wherein the generator control circuit comprises: the device comprises an excitation system, a protection control circuit and a centralized control system. And the protection control circuit is used for outputting a program reverse power signal to the centralized control system when the generator is normally shut down or the generator is tripped due to non-electrical fault, and the centralized control system is used for outputting a demagnetization control signal to the driven end of the excitation system when receiving the program reverse power signal so as to control the excitation system to output an inversion excitation signal with the potential opposite to that of the excitation signal to the excitation winding and then disconnect the de-excitation switch. The embodiment reduces the loss of the field suppression switch when the generator is normally stopped/is tripped due to non-electrical faults.
Description
Technical Field
The utility model relates to the technical field of power generation, in particular to a generator control circuit and a thermal power generation device.
Background
The thermal power generation apparatus generally includes a boiler, a steam turbine, and a generator, wherein the boiler and the steam turbine can convert thermal energy into mechanical energy, and the generator can convert the mechanical energy into electrical energy and output the electrical energy.
When the generator is stopped, the current of the rotor of the generator needs to be rapidly reduced, which is also called field suppression. And the field suppression switch is a switch for connecting in series with the rotor of the generator and disconnecting when the generator is stopped to rapidly remove the current in the rotor of the generator.
However, when the demagnetization switch is turned off, a large current of several thousand amperes still exists at two ends (moving and static contacts) of the demagnetization switch, and at the moment of turning off the demagnetization switch, arcing occurs, which causes great damage to the moving and static contacts of the demagnetization switch, thereby shortening the service life of the demagnetization switch.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a generator control circuit, aiming at solving the problem that a field suppression switch is damaged when a generator is normally stopped or has no electrical fault.
To achieve the above object, the present invention provides a generator control circuit for controlling a generator including an excitation winding, the generator control circuit including:
the input end of the excitation system is used for being connected with an alternating current power supply, and the output end of the excitation system is used for being connected with an excitation winding of the generator;
the protection control circuit is used for outputting a program reverse power signal when the generator is normally stopped/is tripped due to non-electrical faults;
a centralized control system; the centralized control system outputs a field control signal to the driven end of the excitation system so as to control the excitation system to output an excitation signal to the excitation winding; and the excitation system is used for outputting an inverse excitation signal with the potential opposite to that of the excitation signal to the excitation winding when receiving the program inverse power signal.
In one embodiment, the generator control circuit further comprises: the input end and the output end of the field suppression switch are connected with the excitation winding in series, and the controlled end of the field suppression switch is connected with the centralized control system;
the centralized control system includes:
the timer starts timing when receiving the timing control signal and outputs an overflow signal after the timing overflows according to preset time;
the integrated controller is respectively connected with the de-excitation switch, the timer, the output end of the protection control circuit and the driven end of the excitation system; the centralized controller outputs a demagnetization control signal to a driven end of the excitation system, simultaneously sends the timing control signal to the timer, and controls the demagnetization switch to be switched off when receiving the overflow signal;
wherein the preset time is 8-12 seconds.
In an embodiment, the number of the protection control circuits is two, and both the two protection control circuits are connected to the centralized control system.
In one embodiment, the protection control circuit includes:
the input end of the first electronic switch is used for being connected with a direct-current power supply, and the output end of the first electronic switch is connected with a centralized control system;
and the protection controller is connected with the controlled end of the first electronic switch and is used for controlling the first electronic switch to be opened so as to output the program reverse power signal when the generator is normally stopped/is tripped due to non-electrical faults.
In one embodiment, the protection control circuit further comprises:
the input end of the second electronic switch is connected with a direct-current power supply, and the output end of the second electronic switch is connected with the controlled end of the demagnetization switch; and the controlled end of the second electronic switch is connected with the protection controller.
In one embodiment, the first electronic switch is one or more of a relay and a contactor;
the second electronic switch is one or a combination of a relay and a contactor.
In one embodiment, the second electronic switch is a time relay.
In one embodiment, the time delay of the time relay is 8 to 12 seconds.
The utility model also proposes a generator control circuit for controlling a generator comprising an excitation winding, the generator control circuit comprising:
the input end of the excitation system is used for being connected with an alternating current power supply, and the output end of the excitation system is used for being connected with an excitation winding of the generator;
the protection control circuit is used for outputting a program reverse power signal when the generator is normally stopped/is tripped due to non-electrical faults;
the opening detection circuit is connected with the outlet switch of the generator and outputs an opening detection signal when the opening of the outlet switch of the generator is detected;
a centralized control system; the centralized control system outputs a field control signal to the driven end of the excitation system so as to control the excitation system to output an excitation signal to the excitation winding; and the excitation system is used for outputting an inverse excitation signal with the potential opposite to that of the excitation signal to the excitation winding when receiving the opening detection signal and the program inverse power action signal at the same time.
The utility model also provides a thermal power generation device which comprises a boiler, a steam turbine, a generator and the generator control circuit.
According to the technical scheme, a control cable is laid to connect a protection control circuit and a centralized control system, and control words of the protection control circuit are modified, so that when a generator is normally shut down or has no electrical fault, the protection control circuit does not control a de-excitation switch to be directly disconnected, but outputs a program reverse power signal value centralized control system, and when a program reverse power signal is received, a demagnetization control signal is output to a driven end of an excitation system to control the excitation system to output an inverted excitation signal with the potential opposite to that of the excitation signal to the excitation winding, so that the excitation winding is rapidly demagnetized, and current between a movable contact and a fixed contact of the de-excitation switch connected with the excitation winding in series is eliminated. When the de-excitation switch is prevented from being directly disconnected and the de-excitation switch is disconnected, high current of thousands of amperes still exists at two ends (moving and static contacts) of the de-excitation switch, so that arc discharge can be generated at the moment of disconnection of the de-excitation switch, the moving and static contacts of the de-excitation switch are greatly damaged, and the service life of the de-excitation switch is shortened. The utility model prolongs the service life of the de-excitation switch and improves the safety of the generator.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a circuit diagram of an embodiment of a generator control circuit according to the present invention;
fig. 2 is a circuit diagram of another embodiment of the generator control circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
30 | |
| 20 | |
40 | Brake separating detection circuit |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a generator control circuit. The generator is used for controlling a generator/generator set, the generator comprises an excitation winding (namely a rotor of the generator) and a stator conductor, when the generator works, the excitation system 30 outputs a direct-current power supply to the excitation winding, the excitation winding and the stator conductor move relatively under the action of a steam turbine, namely, the stator conductor cuts magnetic lines of force, induced electromotive force is generated in the stator conductor, at the moment, the excitation winding of the generator has current up to thousands of amperes, a field suppression switch is directly switched off, arcing is generated at the moment of switching off of the field suppression switch, moving and static contacts of the field suppression switch are greatly damaged, and the service life of the field suppression switch is shortened.
In view of the above technical problem, in an embodiment of the present invention, the generator control circuit includes:
the input end of the excitation system 30 is used for connecting an alternating current power supply, and the output end of the excitation system 30 is used for connecting an excitation winding of the generator;
the protection control circuit 20 is used for outputting a program reverse power signal when the generator is normally stopped/is tripped due to non-electrical faults;
a centralized control system 10; the output end of the protection control circuit 20 and the driven end of the excitation system 30 are respectively connected, and the centralized control system 10 outputs a field control signal to the driven end of the excitation system 30 to control the excitation system 30 to output an excitation signal to the excitation winding; and the excitation system is used for outputting a demagnetization control signal to the driven end of the excitation system 30 when receiving the program reverse power signal so as to control the excitation system 30 to output an inversion excitation signal with the potential opposite to that of the excitation signal to the excitation winding.
The excitation system 30 may include a rectifier circuit and an excitation regulator, wherein an input end of the rectifier circuit is connected to an ac power supply, an output end of the rectifier circuit is connected to the excitation winding, a controlled end of the rectifier circuit is connected to the excitation regulator, and the excitation regulator outputs different PWM signals to the rectifier circuit according to the magnetization control signal and the demagnetization control signal, so as to control the rectifier circuit to be in a rectification state or an inversion rectification state, for example, when the magnetization control signal is received, and a control angle of the rectifier circuit is controlled to be 0 to 90 degrees, so that the rectifier circuit operates in the rectification state, and the ac power supply is converted into an excitation signal (dc signal). When the second control signal is received, the control angle of the rectification circuit is controlled to retreat to 90-180 degrees, so that the rectification circuit works in an inversion rectification state, an alternating current power supply is converted into an inversion excitation signal (direct current signal) with opposite polarity to the excitation signal, and after the inversion demagnetization control signal is applied to the excitation winding, a magnetic field opposite to the original magnetic field is generated, so that the magnetic field is offset and eliminated, and the rapid demagnetization is realized.
The centralized control system 10 may be a centralized control system 10(DCS) of a thermal power plant. When the generator is started, the centralized control system 10 needs to perform magnetic excitation, and at this time, the centralized control system 10 may output a magnetic excitation control signal to the driven end of the excitation system 30 to control the excitation system 30 to output an excitation signal to the excitation winding, so as to control the generator to convert mechanical energy into electrical energy. When receiving a program reverse power signal, outputting a demagnetization control signal to the driven end of the excitation system 30 to control the excitation system 30 to output an inversion excitation signal with a potential opposite to that of the excitation signal to the excitation winding.
In particular, in practical applications, the generator may comprise a protection control cabinet provided with a protection control circuit 20. In other embodiments, the protection control circuit 20 may be disposed in the generator or other places, which is not limited herein. In this embodiment, the protection control circuit 20 is disposed in the protection cabinet as an example. The protection control circuit 20 is provided with a main controller and a relay array, the relay array comprises a plurality of relays, a moving contact end of each relay is connected with a direct current power supply, a static contact end of each relay is used for outputting a control signal, and a controlled coil of each relay is connected with the main controller of the protection control circuit 20. The main controller outputs a set of control signals by controlling the on/off of the relays in the relay array.
This embodiment may take an example in which the relay group includes 12 relays. Each relay is respectively connected with different functional modules, so that the protection control cabinet controls and outputs control signals to different control modules. Referring to table 2, in the present embodiment, the trip relay 11 is defined as a start-up inverter relay, and the start-up inverter relay is turned on when receiving 1, that is, a high-potential signal, so as to output a program reverse power signal to the centralized control system 10, and does not output the program reverse power signal when receiving 0. The tripping relay 4 is defined as a de-excitation switch control relay, and the de-excitation switch control relay is turned on when receiving 1, namely a high potential signal, and is controlled to be turned on, and is controlled to be turned off when receiving 0.
Thus, the present embodiment can lay a control cable, the output terminal of the trip relay 11 and the centralized control system 10 to output the programmed inverse power action signal value centralized control system 10. Referring to table 1, the control word of the protection control circuit 20 is modified from 1051 to 1841, that is, the control signal for activating the inverter relay (trip relay 11) is changed from 0 to 1, and the control signal for the field-suppression switch control relay (trip relay 4) is changed from 1 to 0. Therefore, when a worker manually closes the switch brake of the thermal power generation device, the main valve of the steam turbine is closed, and the program reverse power of the generator acts to realize program tripping. At this time, only the outlet switch of the generator is turned off (the generator is disconnected from the load), and the protection control circuit 20 does not control the demagnetization switch to be directly turned off, but outputs the program reverse power signal value centralized control system 10. And the centralized control system 10 realizes inversion demagnetization and disconnection of the demagnetization switch.
Table 1: giving the modified output control word of the master controller.
Table 2, a definition of each relay in the relay array of the present embodiment is given.
| Serial number | Name of definite value | Range of definite value | Trip definition |
| 1 | Bit.0 | Function input | This functional input |
| 2 | Bit.1 | TJ 1: trip relay 1 | Jump high side GS111 |
| 3 | Bit.2 | TJ 2: tripping relay 2 | Jump high side GS112 |
| 4 | Bit.3 | TJ 3: tripping relay 3 | Closing main valve |
| 5 | Bit.4 | TJ 4: tripping relay 4 | Jump de-excitation switch |
| 6 | Bit.5 | TJ 5: tripping relay 5 | For standby |
| 7 | Bit.6 | TJ 6: tripping relay 6 | Jump generator switch |
| 8 | Bit.7 | TJ 7: tripping relay 7 | Force reduction |
| 9 | Bit.8 | TJ 8: tripping relay 8 | |
| 10 | Bit.9 | TJ 9: trip relay 9 | Steam turbine load shedding |
| 11 | Bit.10 | TJ 10: |
For standby |
| 12 | Bit.11 | TJ 11: trip relay 11 | Starting inversion de-excitation |
| 13 | Bit.12 | TJ 12: trip relay 12 | Failure of starting circuit breaker |
According to the technical scheme, a control cable is laid to connect a protection control circuit 20 and a centralized control system 10, and control words of the protection control circuit 20 are modified, so that when a generator is normally shut down or has a non-electrical fault, the protection control circuit 20 does not control a de-excitation switch to be directly disconnected, but outputs a program reverse power signal value centralized control system 10, and when a program reverse power signal is received, a demagnetization control signal is output to a driven end of an excitation system 30 to control the excitation system 30 to output an inversion excitation signal with the potential opposite to that of the excitation signal to the excitation winding, so that the excitation winding is rapidly demagnetized, and current between a movable contact and a stationary contact of the de-excitation switch connected with the excitation winding in series is eliminated. When the de-excitation switch is prevented from being directly disconnected and the de-excitation switch is disconnected, high current of thousands of amperes still exists at two ends (moving and static contacts) of the de-excitation switch, so that arc discharge can be generated at the moment of disconnection of the de-excitation switch, the moving and static contacts of the de-excitation switch are greatly damaged, and the service life of the de-excitation switch is shortened. The utility model prolongs the service life of the de-excitation switch and improves the safety of the generator.
In one embodiment, the generator control circuit further comprises: the input end and the output end of the field suppression switch are connected with the excitation winding in series, and the controlled end of the field suppression switch is connected with the centralized control system 10;
the centralized control system 10 includes:
the timer starts timing when receiving the timing control signal and outputs an overflow signal after the timing overflows according to preset time;
the centralized controller is connected with the de-excitation switch, the timer, the output end of the protection control circuit 20 and the driven end of the excitation system 30 respectively; the centralized controller sends the timing control signal to the timer while outputting a demagnetization control signal to the driven end of the excitation system 30, and controls the demagnetization switch to be switched off when receiving the overflow signal;
wherein the preset time is 8-12 seconds.
It should be noted that, the excitation system 30 outputs the inverted excitation signal to the excitation winding to achieve demagnetization of the excitation winding, and a certain time is required, and this embodiment sets the time to 8 to 12 seconds, so that the excitation winding can be demagnetized sufficiently. And then, the centralized controller controls the de-excitation switch to be switched off.
The embodiment can avoid insufficient inverter demagnetization, and the current between the moving contact and the static contact of the demagnetization switch is still in a large value, so that arc discharge can be generated in the moment of disconnection of the demagnetization switch, and the damage to the moving contact and the static contact of the demagnetization switch is large.
In one embodiment, the protection control circuit 20 includes:
the input end of the first electronic switch is used for being connected with a direct current power supply, and the output end of the first electronic switch is connected with the centralized control system 10;
and the protection controller is connected with the controlled end of the first electronic switch and is used for controlling the first electronic switch to be opened so as to output the program reverse power signal when the generator is normally stopped/is tripped due to non-electrical faults.
The first electronic switch may be the trip relay 11 (start inverter relay) in the relay array in the above-described embodiment.
Compared with the method that the program reverse power action signal is directly output through the protection controller and is output through the tripping relay 11, the amplitude of the program reverse power action signal (which is constantly a direct-current power supply connected to the input end of the first electronic switch) can be improved and standardized, so that the centralized control system 10 can better receive the program reverse power action signal.
Further, the protection control circuit 20 further includes:
the input end of the second electronic switch is connected with a direct-current power supply, and the output end of the second electronic switch is connected with the controlled end of the demagnetization switch; and the controlled end of the second electronic switch is connected with the protection controller.
The second electronic switch may be the trip relay 4 (the field suppression switch control relay) in the relay array in the above-described embodiment.
Further, the first electronic switch is one or a combination of a relay and a contactor;
the second electronic switch is one or a combination of a relay and a contactor.
Further, the second electronic switch is a time relay. In one embodiment, the time delay of the time relay is 12 to 14 seconds.
When it is required to be described, the excitation system 30 outputs the inverted excitation signal to the excitation winding to achieve demagnetization of the excitation winding, and a certain time is required. The present embodiment is implemented by setting the second electronic switch as a time relay. And the time delay of the time relay is 8-12 seconds, so that the excitation winding can be fully demagnetized.
The protection control circuit 20 directly outputs the control signal 1851(1100001010001) to the relay array, that is, directly outputs the signal "1" to the trip relay 4. The trip relay 4 is in a delayed state at this time.
So that the integrated controller can receive the program reverse power signal and control the excitation system 30 to perform the inverse excitation on the excitation winding within the delay time.
Then, the tripping relay 4 outputs a control signal to control the turn-off of the de-excitation switch.
The embodiment can avoid the situation that the centralized controller controls the de-excitation switch independently to increase wiring. The inverter can be prevented from being insufficient in demagnetization, so that the current between the moving contact and the static contact of the demagnetization switch is still in a large value, arc discharge can be generated at the moment of disconnection of the demagnetization switch, and the damage to the moving contact and the static contact of the demagnetization switch is large.
In an embodiment, the centralized control system 10 includes a magnetization key circuit and a demagnetization key circuit, and is configured to access the first user control signal and the second user control signal, and when the magnetization key circuit accesses the first user control signal, the centralized control system 10 controls the excitation system 30 to output the excitation signal;
when the demagnetization key circuit is connected to the second user control signal, the centralized control system 10 controls the excitation system 30 to output an inversion excitation signal.
According to the embodiment, the magnetizing and demagnetizing are divided into two key circuits, and compared with the method that one key controls magnetizing and demagnetizing, the embodiment can avoid wrong pressing and improve safety.
In an embodiment, the number of the protection control circuits 20 is two, and both the protection control circuits are connected to the centralized control system 10.
In this embodiment, the number of the protection cabinets of the generator may be two, which are respectively marked as a protection cabinet a and a protection cabinet B, each protection cabinet is provided with a protection control circuit, and a control cable may be laid again in each of the protection cabinets A, B of the generator to the centralized control system 10, and is used as an input of the centralized control system 10, and is defined as an "a set of program reverse power signals" and a "B set of program reverse power signals". When the centralized control system 10 receives the program reverse power action output by any one of the protection control circuits 20 (that is, the centralized controller performs or logic processing on the "a set of program reverse power signals" and the "B set of program reverse power signals" and outputs a demagnetization control signal according to the processing result), outputs a demagnetization control signal and a demagnetization control signal to the protection control circuit 20, so that the protection control circuit 20 demagnetizes the excitation winding first and then turns off the demagnetization switch.
The utility model also proposes a generator control circuit for controlling a generator comprising an excitation winding, the generator control circuit comprising:
the input end of the excitation system 30 is used for connecting an alternating current power supply, and the output end of the excitation system 30 is used for connecting an excitation winding of the generator;
the protection control circuit 20 is used for outputting a program reverse power signal when the generator is normally stopped/is tripped due to non-electrical faults;
the opening detection circuit 40 is connected with the outlet switch of the generator and outputs an opening detection signal when the opening of the outlet switch of the generator is detected;
a centralized control system 10; the output end of the protection control circuit 20 and the driven end of the excitation system 30 are respectively connected, and the centralized control system 10 outputs a field control signal to the driven end of the excitation system 30 to control the excitation system 30 to output an excitation signal to the excitation winding; and the controller is used for outputting a demagnetization control signal to the driven end of the excitation system 30 when receiving the opening detection signal and the program reverse power action signal at the same time (namely, the centralized controller is right the opening detection signal and the program reverse power action signal are subjected to 'and logic processing' and outputting a demagnetization control signal according to a logic result), so as to control the excitation system 30 to output an inversion excitation signal with the potential opposite to that of the excitation signal to the excitation winding.
In this embodiment, only when the outlet switch of the generator is determined to be turned off and the protection control circuit 20 outputs the reverse power operation signal, the centralized control system 10 outputs the demagnetization control signal and the demagnetization control signal to the generator control circuit.
The problem that the normal work of the generator is influenced due to the fact that the central control system 10 mistakenly receives a pseudo program reverse power signal and the generator is mistakenly turned off due to interference signals on a control cable connecting the protection control circuit 20 and the central control system 10 is avoided.
The utility model also provides a thermal power generation device which comprises a boiler, a steam turbine, a generator and the generator control circuit. The specific structure of the generator control circuit refers to the above embodiments, and since the thermal power generation device adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A generator control circuit for controlling a generator including a field winding, the generator control circuit comprising:
the input end of the excitation system is used for being connected with an alternating current power supply, and the output end of the excitation system is used for being connected with an excitation winding of the generator;
the protection control circuit is used for outputting a program reverse power signal when the generator is normally stopped/is tripped due to non-electrical faults;
a centralized control system; the centralized control system outputs a field control signal to the driven end of the excitation system so as to control the excitation system to output an excitation signal to the excitation winding; and the excitation system is used for outputting an inverse excitation signal with the potential opposite to that of the excitation signal to the excitation winding when receiving the program inverse power signal.
2. The generator control circuit of claim 1, further comprising: the input end and the output end of the field suppression switch are connected with the excitation winding in series, and the controlled end of the field suppression switch is connected with the centralized control system;
the centralized control system includes:
the timer starts timing when receiving the timing control signal and outputs an overflow signal after the timing overflows according to preset time;
the integrated controller is respectively connected with the de-excitation switch, the timer, the output end of the protection control circuit and the driven end of the excitation system; the centralized controller outputs a demagnetization control signal to the driven end of the excitation system, simultaneously sends the timing control signal to the timer, and controls the demagnetization switch to be switched off when receiving the overflow signal.
3. The generator control circuit of claim 2, wherein the predetermined time is 8-12 seconds.
4. The generator control circuit of claim 2, wherein the protection control circuit comprises:
the input end of the first electronic switch is used for being connected with a direct-current power supply, and the output end of the first electronic switch is connected with a centralized control system;
and the protection controller is connected with the controlled end of the first electronic switch and is used for controlling the first electronic switch to be opened to output the program reverse power signal when the generator is normally stopped or the generator trips due to non-electrical faults.
5. The generator control circuit of claim 4, wherein the protection control circuit further comprises:
the input end of the second electronic switch is connected with a direct-current power supply, and the output end of the second electronic switch is connected with the controlled end of the demagnetization switch; and the controlled end of the second electronic switch is connected with the protection controller.
6. The generator control circuit of claim 5 wherein said second electronic switch is a time relay.
7. The generator control circuit of claim 6, wherein the time delay of the time relay is 8 to 12 seconds.
8. The generator control circuit of claim 1, wherein the number of the protection control circuits is two, and both of the protection control circuits are connected to the centralized control system.
9. A generator control circuit for controlling a generator including a field winding, the generator control circuit comprising:
the input end of the excitation system is used for being connected with an alternating current power supply, and the output end of the excitation system is used for being connected with an excitation winding of the generator;
the protection control circuit is used for outputting a program reverse power signal when the generator is normally stopped/is tripped due to non-electrical faults;
the opening detection circuit is connected with the outlet switch of the generator and outputs an opening detection signal when the opening of the outlet switch of the generator is detected;
a centralized control system; the centralized control system outputs a field control signal to the driven end of the excitation system so as to control the excitation system to output an excitation signal to the excitation winding; and the excitation system is used for outputting an inverse excitation signal with the potential opposite to that of the excitation signal to the excitation winding when receiving the opening detection signal and the program inverse power action signal at the same time.
10. A thermal power plant comprising a boiler, a steam turbine, a generator and a generator control circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121550700.XU CN215934756U (en) | 2021-07-07 | 2021-07-07 | Generator control circuit and thermal power generation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121550700.XU CN215934756U (en) | 2021-07-07 | 2021-07-07 | Generator control circuit and thermal power generation device |
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| CN215934756U true CN215934756U (en) | 2022-03-01 |
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- 2021-07-07 CN CN202121550700.XU patent/CN215934756U/en active Active
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