CN111987949A - Excitation system, excitation regulator and reactive power measuring device of diesel generating set - Google Patents
Excitation system, excitation regulator and reactive power measuring device of diesel generating set Download PDFInfo
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- CN111987949A CN111987949A CN202010749689.3A CN202010749689A CN111987949A CN 111987949 A CN111987949 A CN 111987949A CN 202010749689 A CN202010749689 A CN 202010749689A CN 111987949 A CN111987949 A CN 111987949A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
- H02P9/305—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices controlling voltage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/003—Measuring reactive component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/25—Special adaptation of control arrangements for generators for combustion engines
Abstract
The utility model belongs to the technical field of generator and auxiliary system thereof, especially, relate to a diesel generating set's excitation system, excitation regulator and reactive measurement device thereof, carry out amplitude limiting control to the alternating voltage signal of representation diesel generator stator voltage and stator current by protection circuit, signal conversion circuit carries out amplitude matching and reactive calculation to the alternating voltage signal, obtain the direct current voltage signal, gain adjustment circuit's output gain is adjustable, output carries out the reverse processing to the reverse circuit after carrying out the amplification processing to the direct current voltage signal and obtains control signal, with control excitation power unit output exciting current to diesel generator. According to the excitation system, the excitation regulator and the reactive power measuring device thereof, the amplitude of the input alternating current signal is limited through the protection circuit, the anti-interference capability of the whole circuit is improved, the reliability is high, and the safety is high; the output gain adjustment is carried out through the gain adjustment circuit, the downstream load is convenient to match, the matching performance is good, and the convenience is strong.
Description
Technical Field
The application belongs to the technical field of generators and auxiliary systems thereof, and particularly relates to an excitation system, an excitation regulator and a reactive power measuring device.
Background
The excitation system is a key control device of an Emergency Diesel Generator Set (EDG) of a nuclear power station, and provides excitation current through a rotor like a Diesel Generator, so that the output voltage and reactive power of the Diesel Generator are controlled, and the stable operation of the Emergency Diesel Generator is ensured. The excitation system mainly comprises an excitation power unit and an excitation regulator, wherein the excitation regulator outputs a trigger pulse signal after processing a received feedback signal provided by the diesel generator, and controls the conduction of the excitation power unit, so that a corresponding excitation current is provided for an excitation winding of the diesel generator. The reactive power measuring device is used as a key component of the excitation regulator and is responsible for receiving alternating voltage signals representing the stator voltage and the stator current of the diesel generator and outputting direct current voltage signals representing the reactive power output of the diesel generator after processing the alternating voltage signals, and the reactive power measuring device is vital to keeping safe and stable operation of the EDG unit.
However, the existing reactive power measuring device cannot adjust output gain, has poor matching with downstream loads, and is not beneficial to equipment maintenance; and surge is easily generated at the input end, the reliability is poor, and faults are easily caused.
Disclosure of Invention
The application aims to provide an excitation system, an excitation regulator and a reactive power measuring device of a diesel generator set, and aims to solve the problems that the traditional excitation system cannot regulate output gain, is poor in matching with downstream loads and is not beneficial to equipment maintenance; and surge is easily generated at the input end, the reliability is poor, and faults are easily caused.
A first aspect of an embodiment of the present application provides an excitation system of a diesel generator set, including:
the protection circuit is used for receiving alternating voltage signals representing the stator voltage and the stator current of the diesel generator and carrying out amplitude limiting control on the alternating voltage signals;
the signal conversion circuit is connected with the protection circuit and is used for carrying out amplitude matching and reactive calculation on the received alternating voltage signal to obtain a direct voltage signal representing the reactive output of the diesel generator;
the gain adjusting circuit is connected with the signal conversion circuit and used for correspondingly adjusting the output gain of the gain adjusting circuit according to the received gain adjusting signal and amplifying the direct-current voltage signal according to the output gain of the gain adjusting circuit; and
and the reverse circuit is connected with the gain adjusting circuit and the excitation power unit and is used for outputting a control signal after performing reverse processing on the amplified direct-current voltage signal, and the control signal is used for indicating the excitation power unit to output excitation current to the diesel generator.
A second aspect of the embodiments of the present application provides an excitation regulator of a diesel generator set, configured to be connected to an excitation power unit, where the excitation regulator includes the excitation system described above.
A third aspect of an embodiment of the present application provides a reactive power measurement device, including:
the excitation power unit is connected with the diesel generator and used for being conducted when receiving a control signal and correspondingly outputting excitation current to the diesel generator; and
in the excitation regulator, the excitation regulator is connected with the diesel generator and the excitation power unit, and is configured to receive an ac voltage signal output by the diesel generator, perform amplitude limiting control, amplitude matching, reactive power calculation, amplification processing, and reverse processing on the ac voltage signal in sequence, and output the control signal to the excitation power unit.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the excitation system, the excitation regulator and the reactive power measuring device of the diesel generating set, the amplitude of the input alternating current signal is limited through the protection circuit, the anti-interference capability of the whole circuit is improved, the reliability is high, and the safety is high; the output gain is adjusted through the gain adjusting circuit, so that the downstream load can be matched conveniently, the matching performance is good, the equipment maintenance is easy, the convenience is strong, and the problems that the output gain cannot be adjusted by the existing excitation system, the matching performance with the downstream load is poor, and the equipment maintenance is not facilitated are solved; and surge is easily generated at the input end, the reliability is poor, and faults are easily caused.
Drawings
Fig. 1 is a schematic block diagram of an excitation system according to an embodiment of the present disclosure;
fig. 2 is a schematic block diagram of an excitation system according to another embodiment of the present application;
fig. 3 is a schematic diagram of a mode structure of an excitation system according to another embodiment of the present application;
FIG. 4 is an exemplary circuit schematic of a protection circuit in the excitation system shown in FIG. 3;
FIG. 5 is an exemplary circuit schematic of an amplitude matching circuit in the excitation system shown in FIG. 2;
FIG. 6 is an exemplary circuit schematic of a reactive power calculation circuit in the excitation system shown in FIG. 2;
FIG. 7 is an exemplary circuit schematic of a gain adjustment circuit in the excitation system shown in FIGS. 1, 2 or 3;
FIG. 8 is an exemplary circuit schematic of a reverse circuit in the excitation system shown in FIGS. 1, 2 or 3;
FIG. 9 is an exemplary circuit schematic of an excitation system provided in accordance with an embodiment of the present application;
FIG. 10 is a block diagram of an excitation system provided by the present application;
fig. 11 is a schematic block structure diagram of a reactive power measurement device according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
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 one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 is a schematic structural diagram of a module of an excitation system according to an embodiment of the present application, and for convenience of description, only parts related to the embodiment are shown, and detailed descriptions are as follows:
an excitation system of a diesel generating set is connected with an excitation power unit 101 and comprises a protection circuit 10, a signal conversion circuit 20, a gain adjusting circuit 30 and an inverter circuit 40.
The protection circuit 10 is connected to the signal conversion circuit 20, the gain adjustment circuit 30 is connected to the signal conversion circuit 20, and the inverter circuit 40 is connected to the gain adjustment circuit 30 and the excitation power unit 101.
The protection circuit 10 is used for receiving and outputting alternating voltage signals representing stator voltage and stator current of the diesel generator, and performing amplitude limiting control on the alternating voltage signals to prevent surging.
Specifically, the ac voltage signal is a three-phase ac signal including a U-phase component, a V-phase component, and a W-phase component. The protection circuit 10 performs amplitude limiting control on the U-phase component, the V-phase component, and the W-phase component, and prevents occurrence of surge, resulting in reduction of reliability and safety of the whole circuit.
The signal conversion circuit 20 is configured to perform amplitude matching and reactive calculation on the received ac voltage signal to obtain and output a dc voltage signal representing reactive output of the diesel generator.
Specifically, the signal conversion circuit 20 performs amplitude matching on the ac voltage signal, and then performs reactive power calculation for calculating the reactive power output of the diesel generator.
The gain adjusting circuit 30 is configured to adjust its own output gain according to the gain adjusting signal, and amplify and output the dc voltage signal according to its own output gain.
Specifically, the gain adjustment circuit 30 may adjust the output gain to a value greater than 1, equal to 1, or less than 1.
The inverter circuit 40 is configured to perform an inversion process on the amplified dc voltage signal to obtain a control signal, and output the control signal to the excitation power unit 101, so as to control the excitation power unit 101 to output an excitation current to the diesel generator.
Specifically, the inverter circuit 40 may be implemented by an inverter. The control signal is used to instruct the field power unit 101 to output a field current to the diesel generator.
According to the excitation system, the excitation regulator and the reactive power measuring device, the protection circuit 10 is used for limiting the amplitude of the input alternating current signal, so that the anti-interference capability of the whole circuit is improved, the reliability is high, and the safety is high; the output gain adjustment is performed by the gain adjustment circuit 30, so that the downstream load can be matched conveniently, and the matching performance and the convenience are good.
Fig. 2 is a schematic structural diagram of a module of an excitation system according to another embodiment of the present application, and for convenience of description, only parts related to this embodiment are shown, and details are as follows:
in an alternative embodiment, the signal conversion circuit 20 includes an amplitude matching circuit 21 and a reactive power calculation circuit 22.
The amplitude matching circuit 21 is connected to the protection circuit 10, and the reactive power calculation circuit 22 is connected to the protection circuit 10, the amplitude matching circuit 21, and the gain adjustment circuit 30.
The amplitude matching circuit 21 is configured to perform amplitude matching on the received ac voltage signal and then output the ac voltage signal.
The reactive power calculation circuit 22 is configured to perform reactive power calculation on the ac voltage signal after amplitude matching, obtain a dc voltage signal, and output the dc voltage signal to the gain adjustment circuit 30.
Specifically, the amplitude matching circuit 21 is configured to adjust amplitudes of three components in the ac voltage signal, that is, amplitudes of the U-phase component, the V-phase component, and the W-phase component, and output the adjusted amplitudes to the reactive power calculation circuit 22, and the reactive power calculation circuit 22 calculates a dc voltage signal, where the dc voltage signal represents a reactive power output of the super power generator.
Fig. 3 is a schematic structural diagram of an excitation system according to still another embodiment of the present application, and for convenience of description, only the parts related to this embodiment are shown, and detailed descriptions are as follows:
in an alternative embodiment, the protection circuit 10 includes a first slice circuit 11, a second slice circuit 12, and a third slice circuit 13.
The first amplitude limiting circuit 11, the second amplitude limiting circuit 12, and the third amplitude limiting circuit 13 are respectively connected to the amplitudes of the U-phase component, the V-phase component, and the W-phase component in the ac voltage signal, and respectively perform amplitude limiting control and output on the U-phase component, the V-phase component, and the W-phase component.
Fig. 4 is a schematic circuit diagram of an example of the protection circuit 10 in the excitation system shown in fig. 3, and for convenience of description, only the parts related to the present embodiment are shown, and detailed as follows:
in an alternative embodiment, the first limiter circuit 11 includes a resistor R10, a resistor R11, a diode D7, and a diode D11.
The first end of the resistor R10 is connected to the U-phase component, the second end of the resistor R10, the first end of the resistor R11, the anode of the diode D7 and the cathode of the diode D11 are connected in common, the cathode of the diode D7 is connected to a positive power supply signal, the anode of the diode D11 is connected to a negative power supply signal, and the second end of the resistor R11 is connected to the amplitude matching circuit 21.
Specifically, the diode D7 and the diode D11 are voltage regulators or transient suppression diodes. When the amplitude of the U-phase component is higher than the first preset value, the input U-phase component is limited through the diode D7 and the diode D11, so as to control the U-phase component to be limited to a state lower than or equal to the first preset value all the time.
In an alternative embodiment, the second slice circuit 12 includes a resistor R4, a resistor R5, a resistor R6, a diode D1, and a diode D2.
The first end of the resistor R4 is connected to the V-phase component, the second end of the resistor R4, the first end of the resistor R5, the anode of the diode D1 and the cathode of the diode D2 are connected in common, the cathode of the diode D1 is connected to a positive power supply signal, the anode of the diode D2 is connected to a negative power supply signal, a node where the second end of the resistor R5 and the first end of the resistor R6 are connected in common is connected to the reactive power calculation circuit 22, and the second end of the resistor R6 is connected to ground.
Specifically, the diode D1 and the diode D2 are voltage regulators or transient suppression diodes. When the amplitude of the V-phase component is higher than the second preset value, the input V-phase component is clipped through the diode D1 and the diode D2 to control the V-phase component to be clipped in a state lower than or equal to the second preset value all the time.
In an alternative embodiment, the first limiter circuit 11 includes a resistor R7, a resistor R8, a diode D8, and a diode D12.
The first end of the resistor R7 is connected to the W-phase component, the second end of the resistor R7, the first end of the resistor R8, the anode of the diode D8 and the cathode of the diode D12 are connected in common, the cathode of the diode D8 is connected to a positive power supply signal, the anode of the diode D12 is connected to a negative power supply signal, and the second end of the resistor R8 is connected to the amplitude matching circuit 21.
Specifically, the diode D8 and the diode D12 are voltage regulators or transient suppression diodes. When the amplitude of the W-phase component is higher than the third preset value, the input W-phase component is clipped through the diode D8 and the diode D12 to control the W-phase component to be always clipped in a state lower than or equal to the third preset value.
Fig. 5 is a schematic circuit diagram illustrating an example of the amplitude matching circuit 21 in the excitation system shown in fig. 2, and for convenience of description, only the parts related to the present embodiment are shown, and detailed as follows:
in an alternative embodiment, the amplitude matching circuit 21 includes a first resistor R36, a second resistor R37, a third resistor R38, and a fourth resistor R39.
The first end of the first resistor R36 and the first end of the second resistor R37 are both connected to the protection circuit 10, the node at which the second end of the first resistor R36 and the first end of the third resistor R38 are connected in common is connected to the signal conversion circuit 20, the node at which the second end of the second resistor R37 and the first end of the fourth resistor R39 are connected in common is connected to the signal conversion circuit 20, and the second end of the third resistor R38 and the second end of the fourth resistor R39 are grounded.
Specifically, the first resistor R36 is connected to the second end of the resistor R8, and the second resistor R37 is connected to the second end of the resistor R11. The first resistor R36 and the third resistor R38 form a first voltage division network, the second resistor R37 and the fourth resistor R39 form a second voltage division network, the first voltage division network divides the W-phase component output by the third amplitude limiting circuit 13 and outputs the W-phase component to the reactive power calculation circuit 22, the second voltage division network divides the U-phase component output by the first amplitude limiting circuit 11 and outputs the U-phase component to the reactive power calculation circuit 22, and the amplitudes of the W-phase component and the U-phase component are adjusted through the first voltage division network and the second voltage division network, so that amplitude matching is achieved on the whole.
Fig. 6 is a schematic circuit diagram illustrating an example of the reactive power calculation circuit 22 in the excitation system shown in fig. 2, and for convenience of description, only the parts related to the present embodiment are shown, and detailed as follows:
in an optional embodiment, the reactive power calculating circuit 22 includes a calculating chip a2, a fifth resistor R14, a sixth resistor R16, a first capacitor C2, a second capacitor C4, a third capacitor C11, a fourth capacitor C12, and a first operational amplifier A4B.
The computing chip a2 includes a positive power supply terminal + Vs, a negative power supply terminal-Vs, an output terminal OUT, and three pairs of differential input terminals, where the first pair of differential input terminals includes a first differential input terminal X1 and a second differential input terminal X2, the second pair of differential input terminals includes a third differential input terminal Y1 and a fourth differential input terminal Y2, and the third pair of differential input terminals includes a fifth differential input terminal Z1 and a sixth differential input terminal Z2.
Specifically, the computing chip a2, model AD534, is a high-precision, high-speed four-quadrant precision multiplier/divider capable of performing multiplication, division, squaring, and open square root operations.
The first differential input end X1 and the second differential input end X2 are both connected with the amplitude matching circuit 21, the third differential input end Y1 is connected with the protection circuit 10, the fourth differential input end Y2 and the sixth differential input end Z2 are grounded, and the output end OUT of the computing chip A2, the fifth differential input end Z1 and the first end of the fifth resistor R14 are connected in common.
Specifically, the first differential input terminal X1 is connected to the second terminal of the first resistor R36/the first terminal of the third resistor R38, the second differential input terminal X2 is connected to the second terminal of the second resistor R37/the first terminal of the fourth resistor R39, and the first differential input terminal X1 and the second differential input terminal X2 are respectively connected to the W-phase component after amplitude adjustment and the U-phase component after amplitude adjustment.
The second end of the fifth resistor R14, the first end of the sixth resistor R16 and the first end of the first capacitor C2 are connected in common, and the second end of the first capacitor C2, the inverting input terminal of the first operational amplifier A4B and the output terminal of the first operational amplifier A4B are connected in common; the second end of the sixth resistor R16, the first end of the second capacitor C4, and the non-inverting input terminal of the first operational amplifier A4B are connected in common; the output terminal of the first operational amplifier A4B is connected to the gain adjustment circuit 30.
Specifically, the output terminal of the first operational amplifier A4B is connected to the gain adjusting circuit 30 as an output terminal for reactive power calculation, and is used for outputting a dc voltage signal.
A node of a first end of the third capacitor C11, which is commonly connected with the positive power supply end + Vs of the computing chip A2, is connected with a positive power supply signal, and a node of a first end of the fourth capacitor C12, which is commonly connected with the negative power supply end-Vs of the computing chip A2, is connected with a negative power supply signal; the second terminal of the second capacitor C4, the second terminal of the third capacitor C11, and the second terminal of the fourth capacitor C12 are grounded.
The second capacitor C4, the third capacitor C11 and the fourth capacitor C12 are used as filter capacitors for filtering out high frequency noise in the circuit.
In this embodiment, the reactive output of the diesel generator is calculated by the reactive calculation circuit 22.
Fig. 7 is a schematic circuit diagram illustrating an example of the gain adjustment circuit 30 in the excitation system shown in fig. 1, 2 or 3, and for convenience of explanation, only the parts related to the present embodiment are shown, and detailed as follows:
in an alternative embodiment, the gain adjustment circuit 30 includes a seventh resistor R18, an eighth resistor R20, a ninth resistor R22, a tenth resistor R24, an adjustable resistor RP2, a fifth capacitor C8, a sixth capacitor C7, and a second operational amplifier A3C.
The first terminal of the seventh resistor R18 is connected to the signal conversion circuit 20, the second terminal of the seventh resistor R18, the first terminal of the eighth resistor R20, and the inverting input terminal of the second operational amplifier A3C are connected in common, and the first terminal of the ninth resistor R22 is connected in common with the non-inverting input terminal of the second operational amplifier A3C.
Specifically, a first end of the seventh resistor R18 is connected to an output end of the reactive power calculation circuit 22, that is, an output end of the first operational amplifier A4B, and is configured to receive a dc voltage signal, where the dc voltage signal represents a reactive power output of the diesel generator.
The second end of the eighth resistor R20 is connected with the adjusting end of the adjustable resistor RP2, and the node at which the output end of the operational amplifier is connected with the first fixed end of the adjustable resistor RP2 is connected with the inverter circuit 40; a second fixed end of the adjustable resistor RP2 is connected to a first end of a tenth resistor R24.
A node of the first power supply end of the second operational amplifier A3C, which is connected with the first end of the fifth capacitor C8 in common, is connected with a positive power supply signal, and a node of the second power supply end of the second operational amplifier A3C, which is connected with the first end of the sixth capacitor C7 in common, is connected with a negative power supply signal; the second terminal of the ninth resistor R22, the second terminal of the tenth resistor R24, the second terminal of the fifth capacitor C8, and the second terminal of the sixth capacitor C7 are grounded.
Specifically, the fifth capacitor C8 and the sixth capacitor C7 are used as filter capacitors for filtering high-frequency noise in the positive power signal and high-frequency noise in the negative power signal, respectively, so that the second operational amplifier A3C operates stably.
In other alternative embodiments, the adjustable resistor RP2 may be implemented by any one of a slide rheostat, a resistor box, or a potentiometer, and may also be implemented by a circuit that can perform the same function as the adjustable resistor RP 2.
The gain adjusting circuit 30 can accurately adjust the output gain by connecting the adjustable resistor RP2 and adjusting the resistance value of the adjustable resistor RP2, can conveniently adjust the output gain without replacing devices, and can realize good matching with downstream equipment.
Fig. 8 is a schematic diagram of an exemplary circuit of the inverter circuit 40 in the excitation system shown in fig. 1, 2 or 3, and for convenience of explanation, only the parts related to the present embodiment are shown, and detailed as follows:
in an alternative embodiment, the inverter circuit 40 includes an eleventh resistor R27, a twelfth resistor R28, a thirteenth resistor R29 and a third operational amplifier A4A.
A first end of the eleventh resistor R27 is connected to the gain adjusting circuit 30, a second end of the eleventh resistor R27, a first end of the twelfth resistor R28 and the inverting input terminal of the third operational amplifier A4A are connected in common, and a node at which a second end of the twelfth resistor R28 and the output terminal of the third operational amplifier A4A are connected in common is connected to the excitation power unit 101; a first terminal of the thirteenth resistor R29 is commonly connected to the non-inverting input terminal of the third operational amplifier A4A, and a second terminal of the thirteenth resistor R29 is grounded.
Specifically, a first end of the eleventh resistor R27 is connected to the output end of the second operational amplifier A3C for receiving the amplified dc voltage signal, and an output end of the third operational amplifier A4A is connected to the excitation power unit 101 as the output end of the inverter circuit 40 for outputting the control signal.
In an alternative embodiment, the excitation system further includes a control panel, which is connected to the gain adjustment circuit 30 and is used for outputting a gain adjustment signal to the gain adjustment circuit 30 to control the gain adjustment circuit 30 to adjust its output gain.
Through newly adding control panel, the staff of being convenient for inputs gain adjustment signal and visual observation data, and is convenient nimble.
In addition, the control panel may also be reused and control more other parameters.
In an alternative embodiment, the excitation system further comprises a power supply circuit.
The power supply circuit is connected to the protection circuit 10, the signal conversion circuit 20, and the gain adjustment circuit 30, and is configured to supply power for the protection circuit 10, the signal conversion circuit 20, and the gain adjustment circuit 30.
Specifically, the power supply circuit provides a positive power supply signal and a negative power supply signal to the protection circuit 10, the power supply circuit also provides a positive power supply signal and a negative power supply signal to the signal conversion circuit 20, and the power supply circuit also provides a positive power supply signal and a negative power supply signal to the gain adjustment circuit 30.
Specifically, the positive power supply signal is a +15V dc signal, and the negative power supply signal is a-15V dc signal.
Fig. 9 is a schematic circuit diagram of an example of an excitation system according to an embodiment of the present application, and for convenience of description, only the parts related to the embodiment are shown, and detailed as follows:
as shown in the figure, in the excitation system provided by this embodiment, the protection circuit 10 is used to access an ac voltage signal representing the stator voltage and the stator current of the diesel generator, and perform amplitude limiting control on the ac voltage signal, so as to prevent the occurrence of surge, improve the anti-interference capability and reliability of the whole circuit, and protect the safety of the post-stage circuit; through gain adjustment circuit 30, adjust output gain, realize the good matching with low reaches equipment, convenient maintenance, the flexibility is strong, and the practicality is high.
Fig. 10 is a structural diagram of an excitation system provided in the present application, and for convenience of explanation, only the parts related to the present embodiment are shown, and details are as follows:
the excitation system provided by the embodiment adopts an integrated design, optimizes the layout of devices, mainly comprises universal electronic elements such as an integrated circuit and a resistance-capacitance device, and has the advantages of adjustable output signal gain, good matching property, strong anti-interference capability, high signal processing precision, good maintainability and the like.
In another aspect, the present application provides an excitation regulator 102 for connecting to an excitation power unit 101, where the excitation regulator 102 includes the excitation system described above.
Fig. 11 is a schematic block structure diagram of a reactive power measurement device 100 provided in this application by an embodiment, and for convenience of description, only parts related to this embodiment are shown, and details are as follows:
a reactive power measuring device 100 is used for being connected with a diesel generator, and the reactive power measuring device 100 comprises an excitation power unit 101 and an excitation regulator 102.
The excitation power unit 101 is connected to a diesel generator, and the excitation regulator 102 is connected to the diesel generator and the excitation power unit 101.
The excitation power unit 101 is used for being conducted when receiving the control signal, and correspondingly outputting an excitation current to the diesel generator.
The excitation regulator 102 is configured to sample an electrical signal output by the diesel generator to obtain a sampling signal, process the sampling signal to obtain a control signal, and output the control signal. The excitation regulator 102 includes the excitation system described above.
Specifically, the excitation power unit 101 is connected to an excitation transformer, and the excitation transformer provides a power supply signal to the excitation power unit 101.
The reactive power measuring device 100 samples and feeds back a computer signal output by the super generator through the excitation regulator 102, and outputs a control signal to the excitation power unit 101, so that the excitation power unit correspondingly outputs an excitation current to the diesel generator, and the excitation regulator 102 comprises the excitation system, so that accurate reactive power output calculation can be realized, the control signal can be correspondingly output, and accurate excitation current can be provided for a rotor of the diesel generator.
In summary, compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the excitation system, the excitation regulator and the reactive power measuring device of the diesel generating set, the amplitude of the input alternating current signal is limited through the protection circuit, the anti-interference capability of the whole circuit is improved, the reliability is high, and the safety is high; the output gain is adjusted through the gain adjusting circuit, so that the downstream load can be matched conveniently, the matching performance is good, the equipment maintenance is easy, the convenience is strong, and the problems that the output gain cannot be adjusted by the existing excitation system, the matching performance with the downstream load is poor, and the equipment maintenance is not facilitated are solved; and surge is easily generated at the input end, the reliability is poor, and faults are easily caused.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Claims (10)
1. An excitation system of a diesel generating set is used for being connected with an excitation power unit, and is characterized by comprising:
the protection circuit is used for receiving alternating voltage signals representing the stator voltage and the stator current of the diesel generator and carrying out amplitude limiting control on the alternating voltage signals;
the signal conversion circuit is connected with the protection circuit and is used for carrying out amplitude matching and reactive calculation on the received alternating voltage signal to obtain a direct voltage signal representing the reactive output of the diesel generator;
the gain adjusting circuit is connected with the signal conversion circuit and used for correspondingly adjusting the output gain of the gain adjusting circuit according to the received gain adjusting signal and amplifying the direct-current voltage signal according to the output gain of the gain adjusting circuit; and
and the reverse circuit is connected with the gain adjusting circuit and the excitation power unit and is used for outputting a control signal after performing reverse processing on the amplified direct-current voltage signal, and the control signal is used for indicating the excitation power unit to output excitation current to the diesel generator.
2. The excitation system of claim 1, wherein said signal conversion circuit comprises:
the amplitude matching circuit is connected with the protection circuit and is used for carrying out amplitude matching on the received alternating voltage signal and then outputting the alternating voltage signal; and
and the reactive power calculation circuit is connected with the protection circuit, the amplitude matching circuit and the gain adjustment circuit and is used for performing reactive power calculation on the alternating voltage signals subjected to amplitude matching to obtain the direct voltage signals and outputting the direct voltage signals to the gain adjustment circuit.
3. The excitation system of claim 1, wherein the protection circuit comprises:
the first amplitude limiting circuit is used for receiving the U-phase component of the alternating voltage signal, carrying out amplitude limiting control on the U-phase component and outputting the U-phase component;
the second amplitude limiting circuit is used for receiving the V-phase component of the alternating voltage signal, carrying out amplitude limiting control on the V-phase component and outputting the V-phase component; and
and the third amplitude limiting circuit is used for receiving the W-phase component of the alternating voltage signal, carrying out amplitude limiting control on the W-phase component and outputting the W-phase component.
4. The excitation system of claim 2, wherein said amplitude matching circuit comprises:
the circuit comprises a first resistor, a second resistor, a third resistor and a fourth resistor;
the first end of the first resistor and the first end of the second resistor are both connected with the protection circuit, the node where the second end of the first resistor and the first end of the third resistor are connected in common is connected with the signal conversion circuit, the node where the second end of the second resistor and the first end of the fourth resistor are connected in common is connected with the signal conversion circuit, and the second end of the third resistor and the second end of the fourth resistor are grounded.
5. The excitation system according to claim 2, wherein the reactive power calculation circuit comprises:
the calculation chip, the fifth resistor, the sixth resistor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the first operational amplifier;
the computing chip comprises a positive power supply end, a negative power supply end, an output end and three pairs of differential input ends, wherein the first pair of differential input ends comprises a first differential input end and a second differential input end, the second pair of differential input ends comprises a third differential input end and a fourth differential input end, and the third pair of differential input ends comprises a fifth differential input end and a sixth differential input end;
the first differential input end and the second differential input end are both connected with the amplitude matching circuit, the third differential input end is connected with the protection circuit, the fourth differential input end and the sixth differential input end are grounded, and the output end of the computing chip, the fifth differential input end and the first end of the fifth resistor are connected in common;
a second end of the fifth resistor, a first end of the sixth resistor and a first end of the first capacitor are connected in common, and a second end of the first capacitor, an inverting input end of the first operational amplifier and an output end of the first operational amplifier are connected in common; the second end of the sixth resistor, the first end of the second capacitor and the non-inverting input end of the first operational amplifier are connected in common; the output end of the first operational amplifier is connected with the gain adjusting circuit;
a node of which the first end of the third capacitor is commonly connected with the positive power supply end of the computing chip is accessed to a positive power supply signal, and a node of which the first end of the fourth capacitor is commonly connected with the negative power supply end of the computing chip is accessed to a negative power supply signal; the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are grounded.
6. The excitation system of claim 1, wherein said gain adjustment circuit comprises:
a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an adjustable resistor, a fifth capacitor, a sixth capacitor and a second operational amplifier;
a first end of the seventh resistor is connected to the signal conversion circuit, a second end of the seventh resistor, a first end of the eighth resistor and the inverting input end of the second operational amplifier are connected in common, and a first end of the ninth resistor and the non-inverting input end of the second operational amplifier are connected in common;
a second end of the eighth resistor is connected with an adjusting end of the adjustable resistor, and a node at which an output end of the operational amplifier and a first fixed end of the adjustable resistor are connected in common is connected with the inverting circuit; a second fixed end of the adjustable resistor is connected with a first end of the tenth resistor;
a node of the first power supply end of the second operational amplifier and the first end of the fifth capacitor, which are connected in common, is connected with a positive power supply signal, and a node of the second power supply end of the second operational amplifier and the first end of the sixth capacitor, which are connected in common, is connected with a negative power supply signal; a second end of the ninth resistor, a second end of the tenth resistor, a second end of the fifth capacitor, and a second end of the sixth capacitor are grounded.
7. The excitation system of claim 1, wherein the reverse circuit comprises:
an eleventh resistor, a twelfth resistor, a thirteenth resistor and a third operational amplifier;
a first end of the eleventh resistor is connected with the gain adjusting circuit, a second end of the eleventh resistor, a first end of the twelfth resistor and an inverting input end of the third operational amplifier are connected in common, and a node at which a second end of the twelfth resistor and an output end of the third operational amplifier are connected in common is connected with the excitation power unit; a first end of the thirteenth resistor is commonly connected with a non-inverting input end of the third operational amplifier, and a second end of the thirteenth resistor is grounded.
8. The excitation system of claim 1, further comprising:
and the control panel is connected with the gain adjusting circuit and used for outputting the gain adjusting signal to the gain adjusting circuit.
9. An excitation regulator for a diesel generator set for connection to an excitation power unit, characterized in that the excitation regulator comprises an excitation system according to any one of claims 1 to 8.
10. A reactive measurement device for connection with a diesel generator, comprising:
the excitation power unit is connected with the diesel generator and used for being conducted when receiving a control signal and correspondingly outputting excitation current to the diesel generator; and
the excitation regulator of claim 9, wherein the excitation regulator is connected to the diesel generator and the excitation power unit, and configured to receive an ac voltage signal output by the diesel generator, perform amplitude limiting control, amplitude matching, reactive power calculation, amplification processing, and reverse processing on the ac voltage signal in sequence, and output the control signal to the excitation power unit.
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