CN109586630B - Excitation regulator and excitation system - Google Patents

Abstract

The invention relates to an excitation regulator which is respectively connected with an excitation power module and a generator and comprises a first control system, a threshold setting system and a second control system, wherein the first control system is connected with the generator and is used for receiving a feedback signal output by the generator and outputting a logic signal for increasing or reducing magnetism; the threshold setting system is connected with the first control system and used for receiving the logic signal of the magnetization or demagnetization and outputting a manual or automatic threshold signal; and the second control system is connected with the excitation power module and used for outputting a trigger pulse signal according to the feedback signal and the threshold signal in a manual or automatic mode, and the trigger pulse signal is used for adjusting the excitation current signal output by the excitation power module. The problem of traditional threshold value setting system rely on mechanical parts to cooperate each other to realize increasing magnetism or reducing magnetism operation to the generator, have the unable automatic adjustment of setting value is solved.

Description

Excitation regulator and excitation system

Technical Field

The invention relates to the field of excitation control of generator sets of nuclear power stations, in particular to an excitation regulator and an excitation system.

Background

The excitation system is a key control device of a diesel generator of the emergency diesel generator set of the nuclear power station, and the output voltage and the reactive power of the generator are controlled by providing excitation current for a generator rotor, so that the stable operation of the set is ensured. The excitation system mainly comprises an excitation power unit and an excitation regulator. The excitation regulator receives a feedback signal provided by the generator, and outputs a trigger pulse signal after processing to control the silicon controlled rectifier of the excitation power unit to work so as to provide excitation current for the excitation winding of the generator.

The threshold setting device is a key component of the excitation regulator and is responsible for receiving an increase/decrease magnetic signal provided by a control system and providing an automatic operation mode and a manual operation mode for the excitation regulator after processing to set a threshold.

The existing threshold setting device is mechanical, mainly comprising a motor, a gearbox, a clutch, a slide rheostat, a travel switch and other mechanical parts, wherein after receiving a magnetizing signal, the motor rotates in the positive direction, the gearbox decelerates in equal proportion, the clutch drives the slide rheostat to act, the set threshold is increased, the magnetizing operation is realized, and when the set threshold is reached, the travel switch synchronously acts to give a position indication signal; after receiving the demagnetization signal, the motor rotates reversely, the gearbox decelerates in equal proportion, the clutch drives the slide rheostat to act, the set threshold value is reduced, the demagnetization operation is realized, and the travel switch synchronously acts to give a position indication signal when the set threshold value is reached. The mechanical threshold setting device realizes functions by means of mutual matching of mechanical components such as a motor, a gearbox, a clutch, a slide rheostat, a travel switch and the like, and has the problems that the set value cannot be adjusted and the precision is low.

Disclosure of Invention

The invention aims to provide an excitation regulator and an excitation system which can automatically adjust the set threshold of the excitation current of a generator.

In order to realize the purpose of the invention, the invention adopts the following technical scheme:

an excitation regulator is respectively connected with an excitation power module and a generator and comprises a first control system, a threshold setting system and a second control system,

the first control system is connected with the generator and used for receiving a feedback signal output by the generator and outputting a logic signal for increasing or reducing magnetism;

the threshold setting system is connected with the first control system and used for receiving the logic signal of the magnetization or demagnetization and outputting a manual or automatic threshold signal;

and the second control system is connected with the excitation power module and used for outputting a trigger pulse signal according to the feedback signal and the manual or automatic mode threshold signal, wherein the trigger pulse signal is used for adjusting the excitation current signal output by the excitation power module.

The excitation regulator comprises a first control system, a threshold setting system and a second control system, wherein the first control system is connected with the generator and used for receiving a feedback signal output by the generator and outputting a logic signal for increasing or reducing magnetism; the threshold setting system is connected with the first control system and used for receiving the logic signal of magnetization increase or demagnetization and outputting a manual or automatic threshold signal; the second control system is connected with the excitation power module and used for outputting a trigger pulse signal according to the feedback signal and the threshold signal in a manual or automatic mode, and the trigger pulse signal is used for adjusting the excitation current signal output by the excitation power module, so that the automatic adjustment of the set threshold of the excitation current of the generator can be realized. The problem of traditional mechanical type threshold value setting device rely on mechanical parts such as motor, gearbox, clutch, travel switch to cooperate each other and realize increasing magnetism or reducing magnetism operation to the generator, have the unable automatic adjustment of setting value is solved.

In order to realize the purpose of the invention, the invention also adopts the following technical scheme:

an excitation system comprising:

the excitation regulator is connected with the generator and used for receiving the feedback signal output by the generator and outputting a trigger pulse signal;

and the input end of the excitation power module is connected with the output end of the excitation regulator, and the output end of the excitation power module is connected with the input end of the generator and used for receiving the trigger pulse signal and outputting an excitation current signal for regulating the generator.

Drawings

FIG. 1 is a schematic diagram of a system configuration of an excitation regulator according to an embodiment;

FIG. 2 is a schematic structural diagram of a system of an excitation regulator in another embodiment;

FIG. 3 is a schematic diagram of a control module according to an embodiment;

FIG. 4 is a circuit diagram of an increase/decrease direction control circuit according to an embodiment;

FIG. 5 is a circuit diagram of an exemplary up/down speed control circuit;

FIG. 6 is a circuit diagram of a logic control circuit according to an embodiment;

FIG. 7 is a circuit diagram of a pulse counting circuit according to an embodiment;

FIG. 8 is a circuit diagram of a signal conversion circuit according to an embodiment;

FIG. 9 is a block diagram of functional modules in an embodiment;

FIG. 10 is a schematic diagram of an embodiment of an automatic threshold matching circuit;

FIG. 11 is a circuit diagram of a first matching circuit in an embodiment;

FIG. 12 is a circuit diagram of a first clipping circuit according to an embodiment;

FIG. 13 is a circuit diagram of a first droop circuit in an embodiment;

FIG. 14 is a circuit diagram of a first zero setting circuit according to an embodiment;

FIG. 15 is a circuit diagram of a first threshold output circuit according to an embodiment;

FIG. 16 is a circuit diagram of a first driving circuit according to an embodiment;

FIG. 17 is a circuit diagram of an exemplary median ceiling circuit;

FIG. 18 is a circuit diagram of an intermediate lower limit circuit in one embodiment;

FIG. 19 is a circuit diagram of a manual threshold matching circuit in one embodiment;

FIG. 20 is a circuit diagram of a second matching circuit in an embodiment;

FIG. 21 is a circuit diagram illustrating a second slicing circuit according to an embodiment;

FIG. 22 is a circuit diagram illustrating a second zero setting circuit according to an embodiment;

FIG. 23 is a circuit diagram of an exemplary inverter circuit;

FIG. 24 is a circuit diagram of a second driving circuit in an embodiment;

FIG. 25 is a circuit diagram of a second threshold output circuit in an embodiment;

FIG. 26 is a circuit schematic of a non-minimum position circuit in one embodiment;

FIG. 27 is a circuit diagram of a control module in an embodiment;

FIG. 28 is a circuit diagram of a functional block in an embodiment;

FIG. 29 is a block diagram of a threshold setting system in accordance with an embodiment;

FIG. 30 is a schematic diagram of a second control system according to an embodiment;

fig. 31 is a schematic structural diagram of an excitation system in an embodiment.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only 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 the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. In the description of the present invention, "a plurality" means at least one, e.g., one, two, etc., unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on methods or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1, fig. 1 is a schematic system structure diagram of an excitation regulator according to an embodiment.

An excitation regulator 10 is respectively connected with an excitation power module 20 and a generator 30, and comprises a first control system 110, a threshold setting system 100 and a second control system 120,

the first control system 110 is connected with the generator 30 and used for receiving the feedback signal output by the generator 30 and outputting a magnetic increasing or reducing logic signal;

the threshold setting system 100 is connected with the first control system 110 and is used for receiving the logic signal of magnetization increase or demagnetization and outputting a manual or automatic threshold signal;

and the second control system 120 is connected to the excitation power module 20, and is configured to output a trigger pulse signal according to the feedback signal and the threshold signal in a manual or automatic manner, where the trigger pulse signal is used to adjust the excitation current signal output by the excitation power module 20.

The excitation regulator 10 comprises a first control system 110, a threshold setting system 100 and a second control system 120, wherein the first control system 110 is connected with the generator 30 and is used for receiving a feedback signal output by the generator 30 and outputting a logic signal for increasing or decreasing magnetism; the threshold setting system 100 is connected to the first control system 110, and is configured to receive a logic signal for increasing or decreasing magnetism and output a manual or automatic threshold signal; the second control system 120 is connected to the excitation power module 20, and is configured to output a trigger pulse signal according to the feedback signal and the threshold signal in a manual or automatic manner, where the trigger pulse signal is used to adjust the excitation current signal output by the excitation power module 20, so as to implement automatic adjustment of the set threshold of the generator excitation current. The problem of traditional mechanical type threshold value setting device rely on mechanical parts such as motor, gearbox, clutch, travel switch to cooperate each other and realize increasing magnetism or reducing magnetism operation to the generator, have the unable automatic adjustment of setting value is solved.

Further, referring to fig. 2, fig. 2 is a schematic structural diagram of a system of an excitation regulator in another embodiment, and the threshold setting system 100 includes:

the control module 102 is connected to the first control system 110, and is configured to receive a logic signal output by the first control system 110 for increasing or decreasing magnetism, and output a threshold voltage signal;

and a functional module 104, an input end of the functional module 104 is connected with an output end of the control module 102, and an output end of the functional module 104 is connected with an input end of the second control system 120, and is used for converting the threshold voltage signal into a threshold signal which can be recognized by the second control system 120 in a manual or automatic mode.

Further, referring to fig. 3, fig. 3 is a schematic structural diagram of a control module in an embodiment, and the control module 102 includes:

the magnetization/demagnetization circuit 1021 is connected with the first control system 110 and is used for performing logic judgment on the magnetization or demagnetization logic signals output by the first control system 110 and outputting magnetization or demagnetization control signals;

the pulse control circuit 1022 is connected with the magnetization/demagnetization circuit 1021 and is used for receiving the magnetization or demagnetization control signal, completing the pulse counting of magnetization or demagnetization and outputting a binary code signal of a threshold;

and a signal conversion circuit 1023 connected to the pulse control circuit 1022 for converting the binary code signal of the threshold value into a threshold voltage signal.

Further, the magnetization/demagnetization circuit 1021 includes:

the magnetization/demagnetization direction control circuit is connected with the first control system 110 and is used for receiving the magnetization or demagnetization logic signals output by the first control system 110, finishing logic judgment of magnetization or demagnetization and controlling the pulse control circuit 1022 to finish pulse counting of magnetization or demagnetization;

and the magnetizing/demagnetizing speed control circuit is connected with the magnetizing/demagnetizing direction control circuit and is used for finishing the speed control of magnetizing or demagnetizing and ensuring that the magnetizing or demagnetizing speed is within a set range.

Specifically, referring to fig. 4, fig. 4 is a schematic circuit diagram of an increase/decrease direction control circuit in an embodiment, the increase/decrease direction control circuit mainly includes a nand gate unit and a relay unit, the nand gate unit includes a nand gate UIA and a nand gate U2A, the relay unit mainly includes a relay RL1 and a relay RL2, and the increase/decrease direction control circuit is mainly configured to receive an increase or decrease logic signal output by the first control system 110, complete logic judgment, and control the pulse control circuit 1022 to complete pulse counting of increase/decrease.

Specifically, referring to fig. 5, fig. 5 is a schematic circuit diagram of a magnetization/demagnetization speed control circuit in an embodiment, where the magnetization/demagnetization speed control circuit mainly includes a nand gate, a resistor and a capacitor, and the magnetization/demagnetization speed control circuit can adjust the corresponding speed of magnetization or demagnetization, so as to improve the matching performance of the system.

Specifically, the pulse control circuit 1022 includes a logic control circuit and a pulse counting circuit, where, referring to fig. 6, fig. 6 is a circuit schematic diagram of the logic control circuit in an embodiment, the logic control circuit is mainly responsible for receiving the control signal output by the magnetization/demagnetization circuit, and controls the pulse counting circuit to complete functions of magnetization counting, demagnetization counting, upper/lower limit limiting, and the like; referring to fig. 7, fig. 7 is a circuit schematic diagram of a pulse counting circuit in an embodiment, the pulse counting circuit is controlled by a logic control circuit, and is mainly used for counting the magnetization or demagnetization pulses and outputting a binary code signal of a threshold.

Specifically, referring to fig. 8, fig. 8 is a circuit schematic diagram of a signal conversion circuit in an embodiment, the signal conversion circuit 1023 includes a digital-to-analog conversion module, in this embodiment, an AD7571 digital-to-analog converter is adopted, the signal conversion circuit 1023 is mainly used for converting a binary code signal of a threshold value output by the pulse control circuit 1022 into a threshold voltage signal, the binary code signal is a 12-bit binary code signal, and the threshold voltage signal is a voltage signal of-10V to 0V.

Further, referring to fig. 9, fig. 9 is a schematic structural diagram of a functional module in an embodiment, and the functional module 104 includes:

an automatic mode threshold matching circuit 1041 connected to the control module 102 for converting the automatic mode threshold voltage signal into an automatic mode threshold signal recognizable by the second control system;

the manual mode threshold matching circuit 1042 is connected to the control module 102 and configured to convert the manual mode threshold voltage signal into a manual mode threshold signal recognizable by the second control system.

Further, referring to fig. 10, fig. 10 is a schematic structural diagram of an automatic threshold matching circuit in an embodiment, where the automatic threshold matching circuit 1041 includes:

the first processing circuit 1410 is connected to the control module 102, and configured to perform voltage matching, amplitude limiting, and amplitude reduction on the automatic threshold voltage signal and output the signal;

and a first zero point setting circuit 1411 connected to the first processing circuit 1410, configured to superimpose the processed automatic mode threshold voltage signal and the initial threshold voltage signal, and output an automatic mode threshold signal that can be recognized by the second control system.

Specifically, the first processing circuit 1410 includes a first matching circuit, a first amplitude limiting circuit, and a first amplitude reducing circuit, where, referring to fig. 11, fig. 11 is a circuit schematic diagram of the first matching circuit in an embodiment, the first matching circuit is connected to the control module 102 and mainly includes an amplifier, and the first matching circuit is configured to convert an automatic mode threshold voltage signal of-10V to 0V output by the control module 102 into an automatic mode threshold voltage signal of-5V to 5V, so as to implement front-stage and rear-stage amplitude matching; referring to fig. 12, fig. 12 is a schematic circuit diagram of a first amplitude limiting circuit in an embodiment, where the first amplitude limiting circuit is connected to a first matching circuit, and is configured to perform amplitude conversion and voltage amplitude limiting on-5V to 5V automatic threshold voltage signals output by the first matching circuit; referring to fig. 13, fig. 13 is a schematic circuit diagram of a first amplitude reduction circuit in an embodiment, where the first amplitude reduction circuit is connected to a first amplitude limiting circuit and is configured to perform amplitude reduction on-5V to 5V threshold voltage signals processed by the first amplitude limiting circuit in an automatic mode.

Specifically, referring to fig. 14, fig. 14 is a circuit schematic diagram of a first zero point setting circuit in an embodiment, where the first zero point setting circuit 1411 is connected to an amplitude reduction circuit in the first processing circuit 1410, and is configured to superimpose an automatic threshold voltage signal after amplitude reduction processing and an initial threshold voltage signal, and output an automatic threshold voltage signal that can be recognized by the second control system, where the initial threshold voltage signal is an initial threshold voltage before no influence of an external magnetization increasing or demagnetization signal, and the setting is automatically returned to the initial threshold voltage after the generator is stopped or started.

Further, referring to fig. 10, fig. 10 is a schematic structural diagram of an automatic threshold matching circuit in an embodiment, and the automatic threshold matching circuit 1041 further includes:

the input end of the first driving circuit 1412 is connected to the output end of the control module 102, and the output end of the first driving circuit 1412 is connected to the input end of the first processing circuit 1410, so as to improve the driving capability of the automatic threshold voltage signal;

the first threshold output circuit 1413 is connected to the first zero point setting circuit 1411, and is used for improving the driving capability of the automatic threshold signal.

Specifically, the first threshold output circuit 1413 is an 944RH output circuit, see fig. 15, and fig. 15 is a circuit schematic diagram of the first threshold output circuit in an embodiment, where the first threshold output circuit 1413 is connected to the first zero point setting circuit 1411, and is used for isolating and outputting the automatic threshold voltage signal to improve the driving capability.

Further, the first driving circuit 1412 includes:

and the input end of the follower circuit is connected with the output end of the control module 102, the output end of the follower circuit is connected with the input end of the first processing circuit 1410, the follower circuit comprises an amplifier, and the follower circuit is used for outputting a control signal with the same amplitude value after the automatic threshold voltage signal is isolated.

Specifically, the first driving circuit 1412 is a follower circuit, referring to fig. 16, and fig. 16 is a circuit schematic diagram of the first driving circuit in an embodiment, and the first driving circuit 1412 is connected to the control module 102 and is configured to output an automatic threshold voltage signal of-10V to 0V from the control module 102, and output a control signal with the same amplitude after isolation to provide driving capability.

Further, referring to fig. 10, fig. 10 is a schematic structural diagram of an automatic threshold matching circuit in an embodiment, and the automatic threshold matching circuit 1041 further includes:

the intermediate value protection circuit 1415, connected to the first zero point setting circuit 1411, includes a first relay unit, and the intermediate value protection circuit 1415 is configured to control the first relay unit to operate when the received automatic mode threshold signal is greater than a first threshold setting value.

Specifically, the intermediate value protection circuit 1415 further includes:

an intermediate value upper limit circuit 1511 connected to the first zero point setting circuit 1411 and including a second relay unit, the intermediate value upper limit circuit 1511 being configured to control the second relay unit to operate when the received automatic mode threshold signal is greater than a second threshold setting value;

the intermediate value lower limit circuit 1510 is connected to the first zero point setting circuit 1411, and includes a third relay unit, and the intermediate value lower limit circuit 1510 is configured to control the third relay unit to operate when the received automatic mode threshold signal is smaller than a third threshold setting value.

The first zero point setting circuit 1411 is mainly configured to superimpose the amplitude-reduced automatic threshold voltage signal with an initial threshold voltage signal and output an automatic threshold voltage signal recognizable by the second control system, where the initial threshold voltage signal is an initial threshold voltage before no influence of the magnetization or demagnetization signal is applied to the outside, and the initial threshold voltage may be understood as an intermediate value, and since the initial threshold voltage is ideally set to 0V but cannot actually reach a control value of 0V, there is a range, such as-0.1V to 0.1V, where the upper limit of the intermediate value is 0.1V, and the lower limit of the intermediate value is-0.1V. Therefore, the intermediate value upper limit circuit and the intermediate value lower limit circuit can optimize parameter setting by adjusting the upper limit or the lower limit of the intermediate value, greatly improve the voltage regulation precision of the excitation system and ensure the safe and stable operation of the downstream equipment of the generator.

Specifically, referring to fig. 17, fig. 17 is a schematic circuit diagram of an intermediate value upper limit circuit in an embodiment, the intermediate value upper limit circuit 1511 is connected to the first zero point setting circuit 1411, and is configured to complete setting of an intermediate value upper limit, where the intermediate value upper limit setting value is related to voltage accuracy of the generator terminal, the setting value is adjustable, and when the setting threshold exceeds the limit value, the relay is controlled to operate, so as to complete indication and alarm functions; referring to fig. 18, fig. 18 is a schematic circuit diagram of an intermediate value lower limit circuit in an embodiment, the intermediate value lower limit circuit 1510 is connected to the first zero circuit 1411, and is configured to complete an intermediate value lower limit setting, where the intermediate value lower limit setting is related to the voltage accuracy of the generator terminal, and the setting is adjustable, and when the setting threshold is lower than the threshold, the setting controls the corresponding relay to operate, thereby completing the indicating and alarming functions.

Further, referring to fig. 19, fig. 19 is a circuit schematic diagram of a manual mode threshold matching circuit in an embodiment, and the manual mode threshold matching circuit 1042 includes:

the second processing circuit 1420, connected to the control module 102, is configured to perform voltage matching and amplitude limiting on the manual threshold voltage signal and output the manual threshold voltage signal;

a second zero point setting circuit 1421, connected to the second processing circuit 1420, for superimposing the processed manual threshold voltage signal and the initially set threshold voltage signal and outputting the superimposed signal;

the inverter circuit 1422 is connected to the second zero point setting circuit 1421, and configured to perform an inversion process on the superimposed manual mode setting threshold voltage signal and output a manual mode threshold signal.

Specifically, the second processing circuit 1420 includes a second matching circuit and a second amplitude limiting circuit, where, referring to fig. 20, fig. 20 is a schematic circuit diagram of the second matching circuit in an embodiment, the second matching circuit is connected to the control module 102 and mainly includes an amplifier, and the second matching circuit is configured to convert a-10V-0V manual threshold voltage signal output by the control module 102 into a 0V-2.3V manual threshold voltage signal to implement amplitude matching; referring to fig. 21, fig. 21 is a schematic circuit diagram of a second amplitude limiting circuit in an embodiment, where the second amplitude limiting circuit is connected to a second matching circuit, and is configured to perform amplitude conversion and voltage amplitude limitation on a 0V-2.3V manual threshold voltage signal output by the second matching circuit.

Specifically, referring to fig. 22, fig. 22 is a circuit schematic diagram of a second zero point setting circuit in an embodiment, the second zero point setting circuit 1421 is connected to a limiter circuit in the second processing circuit 1420, and is configured to superimpose a manual threshold voltage signal after the amplitude limiting processing and an initial threshold voltage signal, and output the manual threshold voltage signal that can be recognized by the second control system, where the initial threshold voltage signal is an initial threshold voltage before no influence of an external magnetization increasing or demagnetization signal, and the setting is automatically returned to the initial threshold voltage after the generator is stopped or started.

Specifically, referring to fig. 23, fig. 23 is a schematic circuit diagram of an inverting circuit in an embodiment, and the inverting circuit 1422 is connected to the second zero point setting circuit 1421, and is configured to invert the threshold voltage signal output by the second zero point setting circuit 1421.

Further, referring to fig. 19, fig. 19 is a circuit schematic diagram of a manual mode threshold matching circuit in an embodiment, and the manual mode threshold matching circuit 1042 further includes:

a second driving circuit 1423, an input end of the second driving circuit 1423 is connected to an output end of the control module 102, and an output end of the second driving circuit 1423 is connected to an input end of the second processing circuit 1420, so as to improve the driving capability of the threshold voltage signal in the manual mode;

a second threshold output circuit 1424, connected to the inverting circuit 1422, is used for improving the output capability of the manual threshold signal.

Specifically, the second driving circuit 1423 is a follower circuit, see fig. 24, and fig. 24 is a circuit schematic diagram of the second driving circuit in an embodiment, and the second driving circuit 1423 is connected to the control module 102 and is configured to output a-10V-0V manual threshold voltage signal from the control module 102, and output a control signal with the same amplitude after isolation to provide driving capability.

Specifically, the second threshold output circuit 1424 is an 944RH output circuit, referring to fig. 25, fig. 25 is a circuit schematic diagram of the second threshold output circuit in an embodiment, and the second threshold output circuit 1424 is connected to the inverting circuit 1422, and is used for isolating and outputting the manual threshold voltage signal, so as to improve the driving capability.

Further, the manual threshold matching circuit 1042 further includes:

a non-minimum position circuit 1425, connected to the inverter circuit 1422, includes a fourth relay unit, the non-minimum position circuit 1425 being configured to control the fourth relay unit to act when the received manual mode threshold signal is less than the minimum position set point.

The minimum position in the non-minimum position circuit 1425 is the minimum lower limit value set by the threshold, and the non-minimum means a position greater than the minimum set point.

Specifically, referring to fig. 26, fig. 26 is a circuit schematic diagram of a non-minimum position circuit in an embodiment, where the non-minimum position circuit 1425 is used to complete non-minimum position setting, and when a set threshold exceeds the limit, the corresponding relay is controlled to operate, so as to complete indication and alarm functions.

Specifically, the threshold setting system includes a control module and a functional module, referring to fig. 27, fig. 27 is a circuit schematic diagram of the control module in an embodiment, where the control module includes a first driving circuit, a first processing circuit, a first zero point setting circuit, a first threshold output circuit, and an intermediate value upper limit circuit; referring to fig. 28, fig. 28 is a schematic circuit diagram of a functional module in an embodiment, where the functional module includes an automatic threshold matching circuit and a manual threshold matching circuit, and a threshold setting system is a key control device of an excitation system of an emergency diesel generator set in a nuclear power plant and is responsible for providing an automatic operation mode setting threshold and a manual operation mode setting threshold signal for the excitation regulator under 3 working conditions of magnetization increasing, demagnetization, and rated, participating in generation of a trigger pulse signal, controlling operation of a thyristor in an excitation power unit, and providing excitation current for an excitation winding of a diesel generator. The specific working principle of the threshold setting system in the embodiment in the excitation system is as follows:

under the condition of magnetization, a threshold setting system receives a magnetization logic signal sent by a first control system, and a magnetization/demagnetization circuit of a control module is responsible for finishing direction judgment and response speed setting; the pulse control circuit receives the magnetism increasing signal sent by the magnetism increasing/decreasing circuit, and the logic control circuit controls the pulse counting circuit to complete pulse counting; the signal conversion circuit is formed by taking AD7541 as a core and is responsible for converting 12-bit binary codes representing a set threshold value sent by the pulse control circuit into voltage signals of-10V-0V; the function module is responsible for carrying out voltage matching, amplitude limiting, zero point setting and other processing on-10V-0V voltage signals sent by a signal conversion circuit in the control module, and outputting set thresholds representing an automatic operation mode and a manual operation mode through a follower; the signal will participate in the generation of the trigger pulse signal, control the action of the excitation power unit silicon controlled rectifier (increase the conduction angle), and improve the excitation current output.

Under the demagnetization working condition, the threshold setting system receives a demagnetization logic signal sent by the first control system, and an increase/demagnetization circuit of the control module is responsible for finishing direction judgment and response speed setting; the pulse control circuit receives the demagnetization signal sent by the magnetization/demagnetization circuit, and the logic control circuit controls the pulse counting circuit to complete pulse counting; the signal conversion circuit is formed by taking AD7541 as a core and is responsible for converting 12-bit binary codes representing a set threshold value sent by the pulse control circuit into voltage signals of-10V-0V; the function module is responsible for carrying out voltage matching, amplitude limiting, zero point setting and other processing on-10V-0V voltage signals sent by a signal conversion circuit in the control module, and outputting set thresholds representing an automatic operation mode and a manual operation mode through a follower; the signal will participate in the generation of the trigger pulse signal, control the action of the excitation power unit silicon controlled rectifier (reduce the conduction angle), and reduce the output of the excitation current.

Under a rated working condition, the control module magnetism increasing/reducing circuit does not work; the signal conversion circuit is formed by taking AD7541 as a core and is responsible for converting a 12-bit binary code representing a rated threshold value sent by the pulse control circuit into a voltage signal of-10V-0V; the function module is responsible for carrying out voltage matching, amplitude limiting, zero point setting and other processing on-10V-0V voltage signals sent by a signal conversion circuit in the control module, and outputting set thresholds representing an automatic operation mode and a manual operation mode through a follower; the signal participates in the generation of a trigger pulse signal, controls the action of the silicon controlled rectifier of the excitation power unit and provides excitation current for the excitation winding of the generator.

Referring to fig. 29, fig. 29 is a schematic structural diagram of a threshold setting system in an embodiment, the threshold setting system mainly includes a control module and a function module, wherein the control module and the function module are integrated in 1 chassis, and can be disassembled and assembled quickly, all set thresholds can be set and measured through a front panel, so that the operation is simplified, the maintainability of the system is improved, meanwhile, corresponding indicator lights are arranged on the front panel, and states such as magnetization increasing, demagnetization, non-minimum positions and the like can be visually indicated on the spot through the indicator lights arranged on the front panel, so that a more visual indication of the operating state of the excitation system is provided for an operator.

Further, referring to fig. 30, fig. 30 is a schematic structural diagram of a second control system in an embodiment, and the second control system 120 includes:

the measuring module 1201 is connected with the generator and used for outputting a feedback signal according to the reactive signal output by the generator;

the conversion module 1202 is connected with the generator and used for converting an excitation current signal output by the generator into a voltage signal;

a voltage regulation module 1203, respectively connected to the threshold setting system 100, the generator, and the measurement module 1201, where the voltage regulation module 1203 is configured to, when the threshold setting system 100 outputs the automatic mode threshold signal, the voltage regulation module 1203 is configured to output a first control signal according to the automatic mode threshold signal, a terminal voltage signal output by the generator, and the feedback signal;

a current adjusting module 1204, respectively connected to the threshold setting system 100, the voltage adjusting module 1203 and the converting module 1202, wherein the current adjusting module 1204 is configured to, when the threshold setting system 100 outputs the automatic mode threshold signal, the current adjusting module 1204 is configured to output a second control signal according to the first control signal and the voltage signal; when the threshold setting system 100 outputs the manual threshold signal, the current adjusting module 1204 is configured to output a third control signal according to the manual threshold signal and the voltage signal;

and a synchronous control pulse module 1205 connected to the current adjusting module 1204, and configured to perform phase transformation and cosine phase shift on the second control signal or the third control signal, and output a trigger pulse signal.

Specifically, the second control system 120 mainly includes a measurement module 1201, a conversion module 1202, a voltage regulation module 1203, a current regulation module 1204 and a synchronous control pulse module 1205, where the measurement module 1201 is a reactive measurement device 987MQ, the conversion module 1202 is an I/V conversion device 989M1, the current regulation module 1204 is a current regulation device 997CT, the voltage regulation device 1203 is a voltage regulation device 988CT, and the synchronous control pulse module 1205 mainly includes a synchronous control device 998CT and control pulse devices 991AL-996AL, and 991AL-996AL are 6 trigger pulse devices. The second control system 120 operates on the following principle: the reactive power measuring device 987MQ is used for outputting a feedback signal to the voltage regulating device 988CT according to the reactive power magnitude fed back by the generator, the voltage regulating device 988CT is an integrated control card, the voltage regulating device 988CT only participates in regulation in the automatic mode, for example, when the threshold setting system outputs an automatic mode threshold signal, the voltage regulating device 988CT adds the automatic mode threshold signal, the feedback signal and the terminal voltage signal of the generator for calculation, and outputs a control quantity to the current regulating device 997CT, the current regulating device 997CT calculates the control quantity from the excitation current feedback signal output by the I/V conversion device 989M1 and the control quantity output by the voltage regulating module 988CT to the synchronous control module 998CT, the synchronous control module 998CT is an intermediate card for performing phase conversion on synchronous voltage, and the control pulse device 991AL-996AL compares the direct current control signal output by the synchronous control module 998CT with the synchronous voltage signal according to the rest The string phase shift principle outputs a trigger pulse signal for controlling the conduction of the controlled silicon; when the threshold setting system outputs a manual mode threshold signal, the current adjusting device 997CT calculates a control quantity to the synchronous control module 998CT according to an excitation current feedback signal and the manual mode threshold signal output by the I/V conversion device 989M1, the synchronous control module 998CT outputs a direct current control signal and a synchronous voltage signal according to the control quantity output by the current adjusting device 997CT, and the control pulse devices 991AL-996AL compare the direct current control signal and the synchronous voltage signal output by the synchronous control module 998CT and output a trigger pulse signal for controlling the conduction of the thyristor according to the cosine phase shift principle.

In order to realize the purpose of the invention, the invention also adopts the following technical scheme:

an excitation system, see fig. 31, fig. 31 is a schematic structural diagram of an excitation system in an embodiment, including:

the excitation regulator 10 is connected with the generator 30, and is used for receiving the feedback signal output by the generator 30 and outputting a trigger pulse signal;

and an input end of the excitation power module 20 is connected with an output end of the excitation regulator 10, and an output end of the excitation power module 20 is connected with an input end of the generator 30, and is used for receiving the trigger pulse signal and outputting an excitation current signal for regulating the generator 30.

The excitation system mainly comprises an excitation regulator 10 and an excitation power module 20, wherein the excitation regulator 10 is used for receiving a feedback signal of the generator and providing a trigger pulse signal for the excitation power module 20 after processing; the excitation power module 20 receives the trigger pulse signal provided by the excitation regulator 10, and provides excitation current for the generator excitation winding, so as to ensure the stable operation of the generator.

Specifically, after receiving an excitation starting command, the excitation regulator 10 works to control the conduction of a thyristor of the excitation power module 20 to provide excitation current for the excitation winding of the generator; the excitation regulator 10 measures the feedback signal of the generator and compares the feedback signal with a set threshold, and when the feedback signal is higher than the set threshold, the conduction angle of the controlled silicon is reduced, the excitation current output is reduced, and the generator terminal voltage returns to the set value. When the feedback signal is lower than the set threshold, the conduction angle of the controllable silicon is increased, the output of the exciting current is increased, and the generator terminal voltage is maintained to be the set value.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (14)

1. An excitation regulator is respectively connected with an excitation power module and a generator and is characterized by comprising a first control system, a threshold setting system and a second control system,

the first control system is connected with the generator and used for receiving a feedback signal output by the generator and outputting a logic signal for increasing or reducing magnetism;

the threshold setting system is connected with the first control system and used for receiving the logic signal of the magnetization or demagnetization and outputting a manual or automatic threshold signal;

the threshold setting system comprises an increasing/decreasing magnetic direction control circuit and an increasing/decreasing magnetic speed control circuit,

the magnetization/demagnetization direction control circuit is connected with the first control system and used for receiving the magnetization or demagnetization logic signals output by the first control system, finishing the logic judgment of the magnetization or demagnetization and outputting the magnetization or demagnetization control signals;

the magnetizing/demagnetizing speed control circuit is connected with the magnetizing/demagnetizing direction control circuit and is used for finishing the speed control of the magnetizing or demagnetizing and ensuring that the magnetizing or demagnetizing speed is within a set range;

and the second control system is connected with the excitation power module and used for outputting a trigger pulse signal according to the feedback signal and the manual or automatic mode threshold signal, wherein the trigger pulse signal is used for adjusting the excitation current signal output by the excitation power module.

2. The field regulator of claim 1, wherein the threshold setting system comprises:

the control module is connected with the first control system and used for receiving the magnetism-increasing or magnetism-reducing logic signal output by the first control system and outputting a threshold voltage signal;

and the input end of the functional module is connected with the output end of the control module, and the output end of the functional module is connected with the input end of the second control system and used for converting the threshold voltage signal into a manual or automatic mode threshold signal which can be identified by the second control system.

3. The field regulator of claim 2, wherein the control module comprises:

the pulse control circuit is connected with the magnetization/demagnetization direction control circuit and used for receiving the magnetization or demagnetization control signals, finishing pulse counting of magnetization or demagnetization and outputting binary code signals of a threshold value;

and the signal conversion circuit is connected with the pulse control circuit and is used for converting the binary code signal of the threshold into a threshold voltage signal.

4. The field regulator of claim 2, wherein the functional module comprises:

the automatic mode threshold matching circuit is connected with the control module and is used for converting the automatic mode threshold voltage signal into an automatic mode threshold signal which can be identified by the second control system;

and the manual mode threshold matching circuit is connected with the control module and is used for converting the manual mode threshold voltage signal into a manual mode threshold signal which can be identified by the second control system.

5. The field regulator of claim 4, wherein said automatic mode threshold matching circuit comprises:

the first processing circuit is connected with the control module and is used for carrying out voltage matching, amplitude limiting and amplitude reducing processing on the automatic mode threshold voltage signal and then outputting the processed signal;

and the first zero point setting circuit is connected with the first processing circuit and is used for superposing the processed automatic mode threshold voltage signal and the initial threshold voltage signal and outputting the automatic mode threshold signal which can be identified by the second control system.

6. The field regulator of claim 5, wherein said automatic mode threshold matching circuit further comprises:

the input end of the first driving circuit is connected with the output end of the control module, and the output end of the first driving circuit is connected with the input end of the first processing circuit and used for improving the driving capability of the automatic threshold voltage signal;

and the first threshold output circuit is connected with the first zero point setting circuit and is used for improving the driving capability of the automatic threshold signal.

7. The field regulator of claim 6, wherein the first drive circuit comprises:

the input end of the following circuit is connected with the output end of the control module, the output end of the following circuit is connected with the input end of the first processing circuit, the following circuit comprises an amplifier, and the following circuit is used for outputting the control signal with the same amplitude after the automatic threshold voltage signal is isolated.

8. The field regulator of claim 5, wherein said automatic mode threshold matching circuit further comprises:

and the intermediate value protection circuit is connected with the first zero point setting circuit and comprises a first relay unit, and the intermediate value protection circuit is configured to control the first relay unit to act when the received automatic mode threshold signal is greater than a first threshold set value.

9. The field regulator of claim 8, wherein the intermediate value protection circuit further comprises:

an intermediate value upper limit circuit connected to the first zero point setting circuit and including a second relay unit, the intermediate value upper limit circuit being configured to control the second relay unit to operate when the received automatic mode threshold signal is greater than a second threshold setting value;

and the intermediate value lower limit circuit is connected with the first zero point setting circuit and comprises a third relay unit, and the intermediate value lower limit circuit is configured to control the third relay unit to act when the received automatic mode threshold signal is smaller than a third threshold set value.

10. The field regulator of claim 4, wherein said manual mode threshold matching circuit comprises:

the second processing circuit is connected with the control module and is used for carrying out voltage matching, amplitude limiting and amplitude reducing processing on the manual threshold voltage signal and then outputting the manual threshold voltage signal;

the second zero point setting circuit is connected with the second processing circuit and is used for outputting the processed manual threshold voltage signal after being superposed with the initially set threshold voltage signal;

and the reverse circuit is connected with the second zero point setting circuit and is used for outputting the manual mode threshold voltage signal after inverting the superposed manual mode setting threshold voltage signal.

11. The field regulator of claim 10, wherein said manual mode threshold matching circuit further comprises:

the input end of the second driving circuit is connected with the output end of the control module, and the output end of the second driving circuit is connected with the input end of the second processing circuit and used for improving the driving capability of the manual threshold voltage signal;

and the second threshold output circuit is connected with the reverse circuit and is used for improving the output capacity of the manual mode threshold signal.

12. The field regulator of claim 10, wherein said manual mode threshold matching circuit further comprises:

a non-minimum position circuit coupled to the reversing circuit and including a fourth relay unit, the non-minimum position circuit configured to control the fourth relay unit to operate when the received manual mode threshold signal is less than a minimum position set point.

13. The field regulator of claim 2, wherein the second control system comprises:

the measuring module is connected with the generator and used for outputting a feedback signal according to the reactive signal output by the generator;

the conversion module is connected with the generator and is used for converting an excitation current signal output by the generator into a voltage signal;

the voltage regulation module is respectively connected with the functional module, the generator and the measurement module, and is configured to output a first control signal according to an automatic mode threshold signal, a terminal voltage signal output by the generator and the feedback signal when the functional module outputs the automatic mode threshold signal;

the current adjusting module is respectively connected with the functional module, the voltage adjusting module and the converting module, and is configured to output a second control signal according to the first control signal and the voltage signal when the functional module outputs an automatic mode threshold signal; when the functional module outputs a manual mode threshold signal, the current regulating module is used for outputting a third control signal according to the manual mode threshold signal and the voltage signal;

and the synchronous control pulse module is connected with the current regulating module and used for performing phase transformation and cosine phase shift processing on the second control signal or the third control signal and then outputting a trigger pulse signal.

14. An excitation system, comprising:

the excitation regulator as claimed in any one of claims 1 to 13, connected to a generator for receiving a feedback signal output by the generator and outputting a trigger pulse signal;

and the input end of the excitation power module is connected with the output end of the excitation regulator, and the output end of the excitation power module is connected with the input end of the generator and used for receiving the trigger pulse signal and outputting an excitation current signal for regulating the generator.

Images