CN210351051U - Adjusting control device of generator excitation system - Google Patents
Adjusting control device of generator excitation system Download PDFInfo
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- CN210351051U CN210351051U CN201921197664.6U CN201921197664U CN210351051U CN 210351051 U CN210351051 U CN 210351051U CN 201921197664 U CN201921197664 U CN 201921197664U CN 210351051 U CN210351051 U CN 210351051U
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Abstract
The utility model relates to the technical field of electrical automation control, in particular to a regulating and controlling device of a generator excitation system, which comprises a synchronous shaping circuit, a machine end voltage and electric quantity transmitter, a reactive electric quantity transmitter, an excitation voltage and current electric quantity transmitter, an analog quantity input module, a digital quantity output module, a logic programmable regulator, a pulse amplifier and a thyristor control circuit; by collecting the generator-end alternating voltage signal, the reactive signal, the excitation voltage signal and the excitation current signal of the generator to be tested and analyzing and judging the signals, the adjusting or controlling instructions of the excitation transformer, the de-excitation loop and the overvoltage control protection loop are obtained, and the response speed and the reliability of the system for processing the control signals such as de-excitation, excitation current adjustment and the like under static and dynamic characteristics are improved.
Description
Technical Field
The utility model relates to an electrical automation control technical field, concretely relates to generator excitation system's regulation and control device.
Background
Along with the enlargement of the scales of power grids and power supplies in China, the characteristics of large networks, high voltages, large units and the like of power systems are increasingly obvious. The stable operation of the large-capacity generator set is important for the safety and stability of the whole power grid. The key link for restricting the stable operation of the generator set at present is a motor excitation system, and the excitation system is also a lever for adjusting reactive power and voltage in a power grid, so that the stable state and the dynamic performance of a power system are improved, and a measure for automatically adjusting the excitation of a synchronous generator is necessary.
The excitation system is a device for supplying field current of the synchronous motor, and includes all regulation and control elements, excitation power units (including excitation transformer), field overvoltage suppression and suppression devices, and other protection devices. The excitation regulation means that the real-time control of terminal voltage, reactive power, power factor, exciting current and the like is realized by regulating exciting current according to a certain regulation rule. The excitation control is control for changing the excitation power in accordance with the signal characteristics of the system state including the synchronous machine, the excitation power unit, and the power grid connected thereto. The generator excitation system is an important basic automation device of a power plant, and the control performance of the generator excitation system is directly related to the static stability and the dynamic stability of a generator set and a power system.
The existing excitation regulating system is realized by adopting a single chip microcomputer or an industrial control computer, but the regulating control system based on the single chip microcomputer is limited by the production process and the quality of elements, so that the problems of dead halt of the single chip microcomputer, failure of regulating function and the like can be caused; the regulation control system based on the industrial personal computer has long access time, large volume and high cost, and is only suitable for large units. In view of this, development of a high-reliability excitation control system with serialization, generalization and standardization features is a development direction; an excitation adjusting system with a field programmable function needs to be developed, and control parameters can be automatically adjusted according to the actual operation condition of the generator excitation system. In addition, as the programmable logic controller plays an important role in a modern industrial control system, but due to the lack of an international strong brand belonging to the programmable logic controller, foreign products are still selected and used in the field of intelligent regulation and control of generator excitation, and the programmable logic controller has multiple brands and high cost. The development of a novel domestic programmable regulation control device for the generator excitation system, which meets the requirements of practical application, has important significance and application prospect.
Disclosure of Invention
In order to solve the above problem, the utility model provides a generator excitation system's regulation and control device, concrete technical scheme is as follows:
a regulation control device of a generator excitation system comprises a synchronous shaping circuit, a generator terminal voltage electric quantity transmitter, a reactive electric quantity transmitter, an excitation voltage current electric quantity transmitter, an analog quantity input module, a digital quantity output module, a logic programmable regulator, a pulse amplifier and a thyristor control circuit;
the synchronous shaping circuit is connected with the digital quantity input module; the terminal voltage electric quantity transmitter, the reactive electric quantity transmitter and the excitation voltage current electric quantity transmitter are respectively connected with the analog quantity input module; the digital quantity input module and the analog quantity input module are respectively connected with the logic programmable regulator; the logic programmable regulator, the digital quantity output module, the pulse amplifier and the thyristor control circuit are sequentially connected;
the synchronous shaping circuit is used for shaping the waveform of the analog quantity signal into a square waveform;
the digital quantity input module is used for receiving the square waveform shaped by the synchronous shaping circuit, and inputting the square waveform to the logic programmable regulator after photoelectric isolation;
the generator terminal voltage and electric quantity transmitter is used for converting a detected generator terminal alternating voltage signal into a direct current analog signal which is isolated and output according to a linear proportion;
the reactive power transmitter is used for converting a reactive power signal of the generator to be tested into a direct current analog signal which is isolated and output according to a linear proportion;
the excitation voltage current electric quantity transmitter is used for converting an excitation voltage signal and an excitation current signal of a detected generator into a direct current analog signal which is isolated and output according to a linear proportion;
the analog quantity input module is used for sampling analog signals respectively input by the terminal voltage electric quantity transmitter, the reactive electric quantity transmitter and the excitation voltage current electric quantity transmitter and inputting the sampled signals to the logic programmable regulator;
the logic programmable regulator is used for analyzing and judging a generator terminal alternating voltage signal, a reactive signal, an excitation voltage signal and an excitation current signal of the generator, calculating to obtain a regulation or control instruction signal for an excitation transformer, a de-excitation loop and an overvoltage control protection loop, and inputting a corresponding instruction signal to the digital quantity output module;
the digital quantity output module is used for isolating the instruction signal obtained by the logic programmable regulator and outputting the instruction signal to the pulse amplifier;
the pulse amplifier is used for performing photoelectric isolation, level conversion and amplification on the instruction signal input by the digital quantity output module, outputting the amplified signal to the thyristor control circuit; sampling the output command signal and transmitting the sampled signal back to the logic programmable regulator;
the thyristor control circuit is used for rectifying according to the instruction signal output by the pulse amplifier and inputting the rectified instruction signal to the exciting transformer, the field suppression loop and the overvoltage control protection loop to adjust or control the actions of the exciting transformer, the field suppression loop and the overvoltage control protection loop.
Preferably, the synchronous shaping circuit adopts a schmitt trigger in a potential triggering mode to form a positive feedback comparator circuit.
Preferably, the terminal voltage electric quantity transmitter, the reactive electric quantity transmitter and the excitation voltage current electric quantity transmitter respectively adopt GMC series transmitters, and the accuracy reaches 0.05 level.
Preferably, the analog input module adopts an AI774 series input module.
Preferably, the digital quantity input module adopts a DI135 series input module.
Preferably, the digital quantity output module adopts a DO135 series output module.
Preferably, the logic programmable regulator adopts a Modicon M258 programmable controller.
Preferably, the pulse amplifier adopts an MBD204 series pulse amplification plate.
Preferably, the thyristor control circuit comprises a silicon controlled rectifier based on a PNPN four-layer semiconductor structure.
The utility model has the advantages that: the utility model provides a generator excitation system's regulation and control device carries out analysis and judgment through gathering the generator end alternating voltage signal of being surveyed the generator, idle signal, excitation voltage signal, excitation current signal, obtains the regulation or the control instruction to exciting transformer, demagnetization return circuit, overvoltage control protection return circuit, has improved the response speed and the reliability of the system control signal such as processing demagnetization, regulation excitation current under quiet, dynamic characteristic.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of a thyristor control circuit.
Detailed Description
For a better understanding of the present invention, the following further description is made in conjunction with the accompanying drawings and the specific embodiments:
the main task of the generator excitation regulating system is to maintain the voltage at the generator terminal of the generator to be stable by regulating the excitation current of the generator, and in static excitation, because the residual voltage of the generator is low, the thyristor trigger unit cannot be reliably triggered when the generator is started, and initial excitation current must be applied to ensure that the secondary side voltage of the excitation transformer is enough to ensure that the thyristor trigger unit can reliably work. Therefore, the utility model provides a generator excitation system's regulation control device, as shown in fig. 1, a generator excitation system's regulation control device, including synchronous shaping circuit, terminal voltage electric quantity transmitter, reactive power transmitter, excitation voltage current electric quantity transmitter, analog input module, digital output module, logic programmable logic controller, pulse amplifier, thyristor control circuit;
the synchronous shaping circuit is connected with the digital quantity input module; the terminal voltage electric quantity transmitter, the reactive electric quantity transmitter and the excitation voltage current electric quantity transmitter are respectively connected with the analog quantity input module; the digital quantity input module and the analog quantity input module are respectively connected with the logic programmable regulator; the logic programmable regulator, the digital quantity output module, the pulse amplifier and the thyristor control circuit are connected in sequence.
The synchronous shaping circuit and the terminal voltage and electric quantity transmitter are respectively connected with a voltage transformer; the current transformer is connected with the reactive power transducer; the voltage transformer and the current transformer are respectively connected with the exciting transformer and the generator; the thyristor control circuit is respectively connected with the excitation transformer, the de-excitation loop and the overvoltage control protection loop.
The synchronous shaping circuit is used for shaping the waveform of the analog quantity signal into a square waveform;
the digital quantity input module is used for receiving the square waveform shaped by the synchronous shaping circuit, and inputting the square waveform to the logic programmable regulator after photoelectric isolation;
the generator terminal voltage electric quantity transmitter is used for converting the alternating current voltage signal of the generator terminal to be detected into a direct current analog signal which is isolated and output according to a linear proportion;
the reactive power transducer is used for converting a reactive power signal of the generator to be tested into a direct current analog signal which is isolated and output according to a linear proportion;
the excitation voltage current electric quantity transmitter is used for converting an excitation voltage signal and an excitation current signal of the generator to be detected into a direct current analog signal which is isolated and output according to a linear proportion;
the analog quantity input module is used for sampling analog signals respectively input by the terminal voltage electric quantity transmitter, the reactive electric quantity transmitter and the excitation voltage current electric quantity transmitter and inputting the sampled signals to the logic programmable regulator;
the logic programmable regulator is used for analyzing and judging a generator terminal alternating voltage signal, a reactive signal, an excitation voltage signal and an excitation current signal of the generator, calculating to obtain a regulation or control instruction signal for the excitation transformer, the de-excitation loop and the overvoltage control protection loop, and inputting the corresponding instruction signal to the digital quantity output module;
the digital quantity output module is used for isolating the instruction signal obtained by the logic programmable regulator and outputting the instruction signal to the pulse amplifier;
the pulse amplifier is used for performing photoelectric isolation, level conversion and amplification on the instruction signal input by the digital quantity output module, outputting the amplified signal to the thyristor control circuit; sampling the output command signal and transmitting the sampled signal back to the logic programmable regulator;
the thyristor control circuit is used for rectifying according to the instruction signal output by the pulse amplifier and inputting the rectified instruction signal to the exciting transformer, the field suppression loop and the overvoltage control protection loop to adjust or control the actions of the exciting transformer, the field suppression loop and the overvoltage control protection loop.
The synchronous shaping circuit adopts a Schmitt trigger in a potential triggering mode to form a positive feedback comparator circuit. The terminal voltage electric quantity transmitter, the reactive electric quantity transmitter and the excitation voltage current electric quantity transmitter respectively adopt GMC series transmitters, and the accuracy reaches 0.05 level. The analog input module adopts an AI774 series input module, has 16-path synchronous parallel sampling function, and can sample 30 ten thousand times per second.
The digital input module adopts DI135 series input module, can access 16-path input signals, and has photoelectric isolation function. The digital output module adopts a DO135 series output module, can output 16 switching value signals and has a photoelectric isolation function. The logic programmable regulator adopts a Modicon M258 programmable controller, analog input supports three types of direct current 0-20 milliampere, direct current 4-20 milliampere and voltage +/-10 volts, digital input supports direct current 24 volts, and the logic programmable regulator is provided with 32 digital input ports and 16 digital output ports and has 6 expandable slots.
The pulse amplifier adopts an MBD204 series pulse amplification board, and can transmit the instruction signal formed on the digital output module to 6 Complementary Metal Oxide Semiconductor (CMOS) transistors through photoelectric isolation and level conversion by an input port for amplification and output through an output port. Another function of the pulse amplifier is to sample the command signal and read it back to the logic programmable regulator to check if the command pulse signal is lost.
The thyristor control circuit comprises a silicon controlled rectifier based on a PNPN four-layer semiconductor structure. As shown in FIG. 2, where Uy is the generator stator voltage, Iy is the generator stator current, + A, + B, + C and-A, -B, -C represent 6 thyristors, KRD1-6 is 6 fast fuses, R1-6 and C1-6 are respectively a resistor and a capacitor, Id is the excitation current, ZDK is the field suppression switch, and Ud is the excitation voltage.
The utility model discloses a data acquisition sends into analog input module and high-speed digital input module after the analog transformation such as exciting current, excitation voltage, terminal voltage, reactive power, grid voltage into 4 ~ 20 mA's electric current through high performance terminal voltage electric quantity changer, reactive power transmitter, excitation voltage electric current electric quantity changer to convert and input to logic programmable logic controller. The logic programmable regulator analyzes and judges basic data such as excitation current, excitation voltage, machine end voltage, reactive power, power grid voltage and the like according to a set regulation control criterion of regulating the excitation current of the generator under working conditions such as no-load operation, rated power, load shedding and the like in technical conditions of static rectification excitation systems and devices of large and medium hydraulic generators (DL/T583) and technical conditions of excitation systems and devices of alternating current exciters of large turbonators (DL/T843), and calculates and obtains regulation or control instructions of exciting transformers, field suppression loops, overvoltage control protection loops and the like.
The adjusting instruction for adjusting the output exciting current of the exciting transformer is an analog quantity signal, needs to be converted by a TLC5510 type parallel comparison analog-digital converter in the logic programmable regulator, and is sent to a digital quantity output module after being converted into a digital quantity signal and used for excitation adjustment. Other action signals related to the de-excitation loop and the overvoltage control protection loop are digital quantity signals, can be sent to the digital quantity output module without conversion, and are used for excitation regulation.
The synchronous signal is connected to the synchronous shaping circuit, shaped into square wave signal and sent to the logic programmable regulator, and matched with the time synchronous signal of the digital input module to be used as the reference point for controlling the trigger and the periodic measuring signal of the synchronous signal. The trigger control angle is converted into a count value by using a high-speed counter in the logic programmable regulator, and when the count value reaches the count value corresponding to the control trigger angle, the trigger control angle is matched with time synchronization signals of a digital quantity input module and an analog quantity input module through time synchronization processing, and trigger pulses about regulating or control instructions for an excitation transformer, a field suppression loop, an overvoltage control protection loop and the like are sent to a digital quantity output module aiming at signals acquired by a synchronous shaping circuit, a terminal voltage electric quantity transmitter, a reactive electric quantity transmitter and an excitation voltage current electric quantity transmitter without delay. The time synchronization processing specifically comprises the steps that the logic programmable regulator receives a first time value sent by a digital quantity input module or an analog quantity input module, and updates a local time value of the logic programmable regulator into a digital quantity input or analog quantity input first time value; and when the logic programmable regulator receives a second time value sent by the digital quantity input module or the analog quantity input module, the self counting time value is updated to the second time value. And the logic programmable regulator calculates and defines an accurate time value sent to the digital quantity output module according to the local time value and the counting time value of the logic programmable regulator.
Because the pulse power of the digital quantity output module is small, the output signal of the digital quantity output module can reach the thyristor control circuit of the trigger power circuit after being subjected to pulse amplification by the pulse amplifier, and the action of the exciting transformer, the field suppression circuit and the overvoltage control protection circuit is controlled by the thyristor control circuit. If the generator is started and operated, the control angle of the thyristor control circuit is adjusted to supply exciting current to the synchronous generator rotor by the exciting transformer; and when the generator terminal voltage exceeds the limit value, the differential protection action and other abnormalities occur, control signals such as field suppression and the like are sent to the field suppression loop and the overvoltage control protection loop through the thyristor control circuit, and the generator rotor and the excitation device are protected.
The present invention is not limited to the above-described embodiments, but only to the preferred embodiments of the present invention, and the present invention is not limited thereto, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (9)
1. An adjusting and controlling device of a generator excitation system is characterized in that: the device comprises a synchronous shaping circuit, a terminal voltage electric quantity transmitter, a reactive electric quantity transmitter, an excitation voltage current electric quantity transmitter, an analog quantity input module, a digital quantity output module, a logic programmable regulator, a pulse amplifier and a thyristor control circuit;
the synchronous shaping circuit is connected with the digital quantity input module; the terminal voltage electric quantity transmitter, the reactive electric quantity transmitter and the excitation voltage current electric quantity transmitter are respectively connected with the analog quantity input module; the digital quantity input module and the analog quantity input module are respectively connected with the logic programmable regulator; the logic programmable regulator, the digital quantity output module, the pulse amplifier and the thyristor control circuit are sequentially connected;
the synchronous shaping circuit is used for shaping the waveform of the analog quantity signal into a square waveform;
the digital quantity input module is used for receiving the square waveform shaped by the synchronous shaping circuit, carrying out photoelectric isolation on the square waveform and inputting the square waveform to the logic programmable regulator;
the generator terminal voltage and electric quantity transmitter is used for converting a detected generator terminal alternating voltage signal into a direct current analog signal which is isolated and output according to a linear proportion;
the reactive power transmitter is used for converting a reactive power signal of the generator to be tested into a direct current analog signal which is isolated and output according to a linear proportion;
the excitation voltage current electric quantity transmitter is used for converting an excitation voltage signal and an excitation current signal of a detected generator into a direct current analog signal which is isolated and output according to a linear proportion;
the analog quantity input module is used for sampling analog signals respectively input by the terminal voltage electric quantity transmitter, the reactive electric quantity transmitter and the excitation voltage current electric quantity transmitter and inputting the sampled signals to the logic programmable regulator;
the logic programmable regulator is used for analyzing and judging a generator terminal alternating voltage signal, a reactive signal, an excitation voltage signal and an excitation current signal of the generator, calculating to obtain a regulation or control instruction signal for an excitation transformer, a de-excitation loop and an overvoltage control protection loop, and inputting a corresponding instruction signal to the digital quantity output module;
the digital quantity output module is used for isolating the instruction signal obtained by the logic programmable regulator and outputting the instruction signal to the pulse amplifier;
the pulse amplifier is used for performing photoelectric isolation, level conversion and amplification on the instruction signal input by the digital quantity output module, outputting the amplified signal to the thyristor control circuit; sampling the output command signal and transmitting the sampled signal back to the logic programmable regulator;
the thyristor control circuit is used for rectifying according to the instruction signal output by the pulse amplifier and inputting the rectified instruction signal to the exciting transformer, the field suppression loop and the overvoltage control protection loop to adjust or control the actions of the exciting transformer, the field suppression loop and the overvoltage control protection loop.
2. The regulation control device of a generator excitation system according to claim 1, characterized in that: the synchronous shaping circuit adopts a Schmitt trigger in a potential triggering mode to form a positive feedback comparator circuit.
3. The regulation control device of a generator excitation system according to claim 1, characterized in that: the terminal voltage electric quantity transmitter, the reactive electric quantity transmitter and the excitation voltage current electric quantity transmitter respectively adopt GMC series transmitters, and the accuracy reaches 0.05 level.
4. The regulation control device of a generator excitation system according to claim 1, characterized in that: the analog input module adopts an AI774 series input module.
5. The regulation control device of a generator excitation system according to claim 1, characterized in that: the digital quantity input module adopts a DI135 series input module.
6. The regulation control device of a generator excitation system according to claim 1, characterized in that: the digital quantity output module adopts a DO135 series output module.
7. The regulation control device of a generator excitation system according to claim 1, characterized in that: the logic programmable regulator adopts a Modicon M258 programmable controller.
8. The regulation control device of a generator excitation system according to claim 1, characterized in that: the pulse amplifier adopts an MBD204 series pulse amplification plate.
9. The regulation control device of a generator excitation system according to claim 1, characterized in that: the thyristor control circuit comprises a silicon controlled rectifier based on a PNPN four-layer semiconductor structure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236378A (en) * | 2021-11-24 | 2022-03-25 | 沈阳航天新光集团有限公司 | CPLD-based excitation detection system of gas turbine generator set |
| CN114296339A (en) * | 2021-12-30 | 2022-04-08 | 中国科学院合肥物质科学研究院 | Control system and method for adjusting secondary current of superconducting transformer |
-
2019
- 2019-07-29 CN CN201921197664.6U patent/CN210351051U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114236378A (en) * | 2021-11-24 | 2022-03-25 | 沈阳航天新光集团有限公司 | CPLD-based excitation detection system of gas turbine generator set |
| CN114296339A (en) * | 2021-12-30 | 2022-04-08 | 中国科学院合肥物质科学研究院 | Control system and method for adjusting secondary current of superconducting transformer |
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