CN204103813U - Based on the low-pressure water turbine generator excitation regulation device of AC sampling - Google Patents
Based on the low-pressure water turbine generator excitation regulation device of AC sampling Download PDFInfo
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- CN204103813U CN204103813U CN201420528865.0U CN201420528865U CN204103813U CN 204103813 U CN204103813 U CN 204103813U CN 201420528865 U CN201420528865 U CN 201420528865U CN 204103813 U CN204103813 U CN 204103813U
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Abstract
Based on the low-pressure water turbine generator excitation regulation device of AC sampling, comprise power circuit, alternating current sampling circuit, host CPU, cpu interface circuit, communicating circuit, excitation pulse triggering drive circuit, display circuit, key circuit; Described power circuit, alternating current sampling circuit, cpu interface circuit, communicating circuit, excitation pulse triggering drive circuit, display circuit, key circuit are connected respectively to described host CPU; Described power circuit comprises power module circuitry and machine end power circuit; Described machine end power circuit comprises current rectifying and wave filtering circuit and DC voltage-stabilizing output circuit, and described current rectifying and wave filtering circuit is connected to described DC voltage-stabilizing output circuit.The utility model provides that a kind of adjusting function is stable, security performance is high, the easy to operate low-pressure water turbine generator excitation regulation device based on AC sampling.
Description
[technical field]
The utility model belongs to power system automation technology field, is specifically related to a kind of low-pressure water turbine generator excitation regulation device based on AC sampling.
[background technology]
Low-pressure water turbine generator excitation control system based on AC sampling is applicable to low-voltage unit automation power station and unmanned or few man on duty power station.Pump for Medium and Small Power Generating Set excitation control system technology backwardness relatively in the market, there is certain potential safety hazard, many outmoded excitation units, or use the manual voltage regulator excitation unit of earliest period and common simple excitation unit, the major defect of this excitation unit has: the automatic adjustment that 1, can not realize excitation needs manually to regulate, and it is larger frequently to carry out Reactive-power control labor strength.2, stability is bad, and manual voltage regulator is after in a few years running, and the situation that ubiquity is oxidized by electric spark, regulates the situation that there will be idle fluctuation in this case.3, not reserved automation interface, cannot carry out automation connection.4, the accuracy of Reactive-power control is not high.
[summary of the invention]
Technical problem to be solved in the utility model is to provide that a kind of adjusting function is stable, security performance is high, the easy to operate low-pressure water turbine generator excitation regulation device based on AC sampling.
The utility model is achieved in that
Based on the low-pressure water turbine generator excitation regulation device of AC sampling, comprise power circuit, alternating current sampling circuit, host CPU, cpu interface circuit, communicating circuit, excitation pulse triggering drive circuit, display circuit, key circuit;
Described power circuit, alternating current sampling circuit, cpu interface circuit, communicating circuit, excitation pulse triggering drive circuit, display circuit, key circuit are connected respectively to described host CPU;
Described power circuit comprises power module circuitry and machine end power circuit; Described machine end power circuit comprises current rectifying and wave filtering circuit and DC voltage-stabilizing output circuit, and described current rectifying and wave filtering circuit is connected to described DC voltage-stabilizing output circuit;
Described alternating current sampling circuit comprises set end voltage sample circuit, machine end current sampling circuit, excitation 75mv sample circuit, machine end frequency measurement circuit, machine end sampling A/D chip, adjusts difference sample circuit; Described set end voltage sample circuit, machine end current sampling circuit, excitation 75mv sample circuit are connected respectively to described machine end sampling A/D chip; Described set end voltage sample circuit, machine end current sampling circuit are connected respectively to described tune difference sample circuit.
Further, described power module circuitry comprises DC24V power module, AC220V power module; Described DC24V power module comprises power supply input over-voltage over-current protection circuit, a DC/DC change-over circuit; Described power supply input over-voltage over-current protection circuit is connected to a described DC/DC change-over circuit; Described AC220V power module comprises AC/DC change-over circuit, the 2nd DC/DC change-over circuit; Described AC/DC change-over circuit is connected to described 2nd DC/DC change-over circuit.
Further, described cpu interface circuit comprises and opening into circuit, digital output circuit, memory circuit, CPU watchdog circuit.
Further, described communicating circuit is RS485 interface.
The utility model has the advantage of: 1, higher function i ntegration: contain generator excitation control and generating unit speed signal measurement, two kinds of functions.2, highly versatile: specially for the application of medium-small hydropower plants excitation system, by simple software merit rating, just can use in brushless excitation system and thyristor excited system respectively.3, communication interface convenient, control flexible, simple to operate: equipment can be connected to host computer by communication interface; by the generating real-time condition of upper computer detection to multiple associated power station; administrative staff carry out startup-shutdown and the increasing and decreasing load of rational management unit, while the safe and stable operation of guarantee whole hydroelectric station, also significantly reduce Field Force's labour intensity.4, operation control method is flexible: have constant voltage operational mode and constant current operational mode two kinds of operational modes, and without under system grid condition, excitation control system can control generator and carry out independent minor scale power net operation.
[accompanying drawing explanation]
The utility model is further described with reference to the accompanying drawings in conjunction with the embodiments.
Fig. 1 is the utility model hardware structure diagram.
Fig. 2 is the utility model external wiring diagram.
Fig. 3 is the utility model communication system architecture block diagram.
[embodiment]
Refer to shown in Fig. 1, the utility model excitation regulation device hardware configuration is described in detail.
Based on the low-pressure water turbine generator excitation regulation device of AC sampling, comprise power circuit, alternating current sampling circuit, host CPU, cpu interface circuit, communicating circuit, excitation pulse triggering drive circuit, display circuit, key circuit;
Described power circuit, alternating current sampling circuit, cpu interface circuit, communicating circuit, excitation pulse triggering drive circuit, display circuit, key circuit are connected respectively to described host CPU;
Described power circuit comprises power module circuitry and machine end power circuit; Described machine end power circuit comprises current rectifying and wave filtering circuit and DC voltage-stabilizing output circuit, and described current rectifying and wave filtering circuit is connected to described DC voltage-stabilizing output circuit;
Described alternating current sampling circuit comprises set end voltage sample circuit, machine end current sampling circuit, excitation 75mv sample circuit, machine end frequency measurement circuit, machine end sampling A/D chip, adjusts difference sample circuit; Described set end voltage sample circuit, machine end current sampling circuit, excitation 75mv sample circuit are connected respectively to described machine end sampling A/D chip; Described set end voltage sample circuit, machine end current sampling circuit are connected respectively to described tune difference sample circuit.
Described power module circuitry comprises DC24V power module, AC220V power module; Described DC24V power module comprises power supply input over-voltage over-current protection circuit, a DC/DC change-over circuit; Described power supply input over-voltage over-current protection circuit is connected to a described DC/DC change-over circuit; Described AC220V power module comprises AC/DC change-over circuit, the 2nd DC/DC change-over circuit; Described AC/DC change-over circuit is connected to described 2nd DC/DC change-over circuit.
Described cpu interface circuit comprises to be opened into circuit, digital output circuit, memory circuit, CPU watchdog circuit.
Described communicating circuit is RS485 interface.
Host CPU take single-chip microcomputer as core, its data acquisition, s operation control, and parameter is given, the monitoring contents such as pulse output and parameter display.
This device adopts dual power supply, a routing power module for power supply, and user selects DC24V supply module or AC220V supply module according to power station actual conditions; It is after machine sets up pressure that another road powers, and by the set end voltage sample circuit of set end voltage in alternating current sampling circuit, first after current rectifying and wave filtering circuit, then through DC voltage-stabilizing output circuit, provides power supply to device.
The gatherer process of exciting current is as follows: the millivolt signal produced after shunt by rotor current, and through machine end sampling A/D chip, such host CPU just can controller end sampling A/D chip be sampled to exciting current.
Machine end current sampling circuit mainly realizes machine end C phase current sampling, adjust difference circuit single-phase hardware to adjust difference operation principle as follows: the secondary voltage of set end voltage Ua-j and Ub-j after the transformer pressure-reducing of set end voltage sample circuit becomes is superimposed with by machine end current sampling circuit out single-phase C phase current form one and adjust potential difference, directly connect through toning difference sample circuit and carry out tunes potential difference to host CPU and sample.
Open and comprise circuit breaker position judgement, demagnetization order into circuit, increase excitation, excitation reduction, permanent exciting current operational mode five intakes, user is by opening the control into circuit realiration excitation unit; Digital output circuit comprises that compressor emergency shutdown, frequency are normal, unit overruns three amounts of outputing, and simply can carry out tach signal control by the amount of outputing.
Pulse driving circuit mainly realizes SCR pulse trigger and drives and trigger impulse isolation, and pulse-triggered realizes primarily of the phase shift system of software, has the features such as trigger impulse is stablized and symmetry is good.
Described communicating circuit refers to RS485 communication interface circuit, and its Main Function is used to and PLC display unit communication use, thus realizes remote operation management.Data communication adopts general " Modbus agreement " communication protocol.
Described display circuit is mainly made up of display chip, charactron, light-emitting diode and button, and its major function is display excitation parameter and instruction excited state.
Key circuit is mainly used for parameter display and browses and parameter setting operation.
Refer to shown in Fig. 2, the external cabling of the utility model excitation regulation device is described in detail.
The peripheral circuit of whole adjuster comprises silicon controlled module KZ, excitation Trigger transformers LB, 75mv DC excitation current diverter FL, generator unit F, magnet exciting coil LQ, machine potential transformer PT, machine end Current Transmit and generator circuit breaker auxiliary magnet DL; Machine potential transformer PT is connected to machine end frequency measurement circuit of the present utility model and set end voltage sample circuit, after be connected to host CPU; Excitation becomes LB, silicon controlled module KZ, the major loop that excitation controls; Host CPU exports trigger impulse by digit shifter mode, triggers after drive circuit being connected to silicon controlled module KZ, carry out excitation con-trol through excitation pulse; 75mv DC excitation current diverter FL is as exciting current measurement; Machine end Current Transmit is as machine end C current phasor measurement; Generator circuit breaker auxiliary magnet DL is as judging whether generating set is in and the foundation of net state.
Simple excitation con-trol operating process is as follows: first set end voltage electric current, 75mv excitation signal, silicon controlled trigger signal, input and output signal and power supply signal are linked into the utility model, unit is in idling conditions, carry out when frequency is in about 50Hz building pressure, for avoiding the situation producing low frequency overvoltage when rotating speed is lower than inversion field suppression function automatic during setting, simultaneously like this field suppression switch useful life also greatly can be extended; When the overrun output valve timer of rotating speed higher than regulation is overrun and drawn in favour of PLC alarm indication, may overpressure situation being there is when pressure is built in normal excitation, overpressure situation can be improved by changing excitation parameters; Excitation is built after pressure is stablized and can be incorporated into the power networks, and switches in the mode of grid-connected rear operation mode constant voltage and constant current.
Refer to shown in Fig. 3, the utility model excitation communication system architecture block diagram is described in detail.
The excitation situation in a plurality of hydroelectric station can be monitored simultaneously and manage to the utility model excitation communication system, whole system comprises single Managing system of above position machine, a plurality of PLC display unit, a plurality of the utility model device, a plurality of wireless communication module and a plurality of fibre-optic terminuss equipment; Single fibre-optic terminus equipment and single wireless communication module, single PLC display unit and a plurality of the utility model device be in parallel is comprised specific to single power station; The utility model device and PLC display unit carry out excitation data monitoring and control by 485 communication modes, there are two kinds of communication ports, wireless communication module passage and fibre-optic terminus equipment ethernet communication passage between Managing system of above position machine and PLC display unit simultaneously.By communication port, host computer can carry out data monitoring and control.
Managing system of above position machine, is mainly realized storage and the statistics of excitation data, is controlled by remote software to PLC, indirectly realizes carrying out data monitoring and excitation regulation control to excitation regulation device of the present utility model.
The utility model has higher function i ntegration: contain generator excitation control and generating unit speed signal measurement, two kinds of functions.Highly versatile: specially for the application of medium-small hydropower plants excitation system, by simple software merit rating, just can use in brushless excitation system and thyristor excited system respectively.Communication interface facilitates, it is flexible, simple to operate to control: equipment can be connected to host computer by communication interface; by the generating real-time condition of upper computer detection to multiple associated power station; administrative staff carry out startup-shutdown and the increasing and decreasing load of rational management unit, while the safe and stable operation of guarantee whole hydroelectric station, also significantly reduce Field Force's labour intensity.Operation control method is flexible: have constant voltage operational mode and constant current operational mode two kinds of operational modes, and without under system grid condition, excitation control system can control generator and carry out independent minor scale power net operation.
The above, be only the utility model preferred embodiment, therefore the scope that the utility model implements can not be limited according to this, the equivalence namely done according to the utility model the scope of the claims and description change with modify, all should still belong in scope that the utility model contains.
Claims (4)
1. based on the low-pressure water turbine generator excitation regulation device of AC sampling, it is characterized in that: comprise power circuit, alternating current sampling circuit, host CPU, cpu interface circuit, communicating circuit, excitation pulse triggering drive circuit, display circuit, key circuit;
Described power circuit, alternating current sampling circuit, cpu interface circuit, communicating circuit, excitation pulse triggering drive circuit, display circuit, key circuit are connected respectively to described host CPU;
Described power circuit comprises power module circuitry and machine end power circuit; Described machine end power circuit comprises current rectifying and wave filtering circuit and DC voltage-stabilizing output circuit, and described current rectifying and wave filtering circuit is connected to described DC voltage-stabilizing output circuit;
Described alternating current sampling circuit comprises set end voltage sample circuit, machine end current sampling circuit, excitation 75mv sample circuit, machine end frequency measurement circuit, machine end sampling A/D chip, adjusts difference sample circuit; Described set end voltage sample circuit, machine end current sampling circuit, excitation 75mv sample circuit are connected respectively to described machine end sampling A/D chip; Described set end voltage sample circuit, machine end current sampling circuit are connected respectively to described tune difference sample circuit.
2., as claimed in claim 1 based on the low-pressure water turbine generator excitation regulation device of AC sampling, it is characterized in that: described power module circuitry comprises DC24V power module, AC220V power module; Described DC24V power module comprises power supply input over-voltage over-current protection circuit, a DC/DC change-over circuit; Described power supply input over-voltage over-current protection circuit is connected to a described DC/DC change-over circuit; Described AC220V power module comprises AC/DC change-over circuit, the 2nd DC/DC change-over circuit; Described AC/DC change-over circuit is connected to described 2nd DC/DC change-over circuit.
3., as claimed in claim 1 based on the low-pressure water turbine generator excitation regulation device of AC sampling, it is characterized in that: described cpu interface circuit comprises to be opened into circuit, digital output circuit, memory circuit, CPU watchdog circuit.
4., as claimed in claim 1 based on the low-pressure water turbine generator excitation regulation device of AC sampling, it is characterized in that: described communicating circuit is RS485 interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420528865.0U CN204103813U (en) | 2014-09-15 | 2014-09-15 | Based on the low-pressure water turbine generator excitation regulation device of AC sampling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420528865.0U CN204103813U (en) | 2014-09-15 | 2014-09-15 | Based on the low-pressure water turbine generator excitation regulation device of AC sampling |
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| CN204103813U true CN204103813U (en) | 2015-01-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763113A (en) * | 2016-04-01 | 2016-07-13 | 钛能科技股份有限公司 | Low voltage hydroelectric generating set excitation-free dual-power excitation regulation circuit |
| CN109617478A (en) * | 2018-12-17 | 2019-04-12 | 四川茂龙发电设备制造有限公司 | A kind of Excitation Control System of Synchronization Generator |
-
2014
- 2014-09-15 CN CN201420528865.0U patent/CN204103813U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763113A (en) * | 2016-04-01 | 2016-07-13 | 钛能科技股份有限公司 | Low voltage hydroelectric generating set excitation-free dual-power excitation regulation circuit |
| CN109617478A (en) * | 2018-12-17 | 2019-04-12 | 四川茂龙发电设备制造有限公司 | A kind of Excitation Control System of Synchronization Generator |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |