CN102856929B - Automatic quasi-synchronization real-time power generator monitoring method and system - Google Patents
Automatic quasi-synchronization real-time power generator monitoring method and system Download PDFInfo
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- CN102856929B CN102856929B CN201210104694.4A CN201210104694A CN102856929B CN 102856929 B CN102856929 B CN 102856929B CN 201210104694 A CN201210104694 A CN 201210104694A CN 102856929 B CN102856929 B CN 102856929B
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Abstract
The invention discloses an automatic quasi-synchronization real-time power generator monitoring method and system. The system comprises a processing unit, a signal input and conversion circuit, an indication and control output circuit, and an interference-proof and power monitoring circuit, wherein the signal input and conversion circuit, the indication and control output circuit, and the interference-proof and power monitoring circuit are respectively connected with the processing unit; the signal input and conversion circuit is used for converting sinusoidal signals at both sides to be merged into digital signals; the processing unit performs calculation processing on the signals adopting a scientific method, thereby accurately determining a switch-on output moment; and the indication and control output circuit is used for sending the output signal to a power generator. The invention completely overcomes disadvantages of a simulation device; frequency difference and phase difference are calculated with high precision; and switch-on ahead time is determined with millisecond precision. Under the conditions that two-side pressure difference is qualified, frequency difference is qualified, and set leading time and breaker mechanical action time conform to each other, rapid shock-free switching on can be realized.
Description
Technical field
The invention belongs to automatic control technology field, relate to a kind of method for real-time monitoring, relate in particular to a kind of generator automatic presynchronization method for real-time monitoring; Meanwhile, the invention still further relates to a kind of generator automatic presynchronization real-time monitoring system.
Background technology
Quasi-synchronization paralleling is that the generator of input coefficient is not added to excitation, and regulate its voltage and frequency, in the time meeting condition arranged side by side (being that voltage, frequency, phase place are identical), by generator input coefficient, if in the ideal case, the gate out switch of generator is closed a floodgate, and the circulation in generator unit stator loop will be zero, so can generation current and the impact of electromagnetic torque.This is the great advantage of quasi-synchronization paralleling.
Generator quasi-synchronization paralleling is very important operation of electric power system, in the moment of generator input coefficient paired running, is often accompanied by rush of current and power rush, and will cause arranged side by side the instantaneous decline of line voltage.If operating mistake, impulse current is excessive, may make the macro-axis distortion of unit and cause generator winding deformation, tear, insulation damages.Serious non-synchronization paralleling can cause unit and power grid accident, thus power department by and automation classify a vital task of Automation of Electric Systems as.
Traditional manual synchronous operation phase error is larger, and traditional accurate same period of the auto-parallel device precision based on analog circuit is also not high enough, and self-regulating process is slower, and device will strictly be debugged, periodic check.
Summary of the invention
Technical problem to be solved by this invention is: a kind of generator automatic presynchronization method for real-time monitoring is provided, can solves weak point of the prior art.
In addition, the present invention also provides a kind of generator automatic presynchronization real-time monitoring system, and cocoa solves weak point of the prior art.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of generator automatic presynchronization method for real-time monitoring, by treating that also the sine wave signal of both sides is converted to digital signal, then carries out computing by processing unit to it, thereby accurately determines combined floodgate output time.
As a preferred embodiment of the present invention, described method also comprises: both sides signal is carried out to frequency and voltage sample, after data processing, on display, show, in the time that both sides frequency difference is defective, according to the size of departure, send the regulating impulse that length is different, and realize proportional control according to the variable quantity of generator frequency after regulating.
A kind of generator automatic presynchronization real-time monitoring system, described system comprises: processing unit, signal input and translation circuit, instruction and control output circuit, anti-tampering and power supply supervisory circuit; Described signal input and translation circuit, instruction and control output circuit, anti-tampering and power supply supervisory circuit is connected with processing unit respectively; Described signal input and translation circuit are in order to treating that also the sine wave signal of both sides is converted to digital signal; Described processing unit carries out computing to it, thereby accurately determines combined floodgate output time; Described instruction and control output circuit are in order to be sent to generator by output signal.
As a preferred embodiment of the present invention, described signal input and translation circuit carry out frequency and voltage sample to both sides signal, after data processing, can on display, show; Described processing unit, in the time that both sides frequency difference is defective, according to the size of departure, sends the regulating impulse that length is different, and realizes proportional control according to the variable quantity of generator frequency after regulating.
As a preferred embodiment of the present invention, described signal input and translation circuit comprise first signal input and conversion module, secondary signal input and conversion module;
Described first signal input and conversion module comprise that the first synchronous voltage switch unit, the first ac circuit unit, the first zero passage comparing unit, the first sampling keep loop, first frequency measuring circuit; The first ac circuit unit keeps loop to be connected with the first synchronous voltage switch unit, the first zero passage comparing unit, the first sampling respectively, and the first zero passage comparing unit is connected with first frequency measuring circuit;
Described secondary signal input and conversion module comprise that the second synchronous voltage switch unit, the second ac circuit unit, the second zero passage comparing unit, the second sampling keep loop, second frequency measuring circuit; The second ac circuit unit keeps loop to be connected with the second synchronous voltage switch unit, the second zero passage comparing unit, the second sampling respectively, and the second zero passage comparing unit is connected with second frequency measuring circuit;
The input of described signal and translation circuit also comprise that the object input circuit same period that connects successively, filtering light are every circuit, decoding circuit, and decoding circuit is connected with processing unit;
Described instruction and control output circuit comprise Combinational Logic Control output unit, the first photoelectricity isolation output driver element, signal sending controling unit, speed regulating control unit, Regulation Control unit; The first photoelectricity isolation output driver element is connected with Combinational Logic Control output unit, signal sending controling unit, speed regulating control unit, Regulation Control unit respectively;
Described instruction and control output circuit also comprise combined floodgate logic control output unit, the second photoelectricity isolation output driver element, switching-in control unit, synchronous logic control output unit; The second photoelectricity isolation output driver element is connected with combined floodgate logic control output unit, switching-in control unit, synchronous logic control output unit respectively;
Described processing unit comprises first processor, the second processor; Described first processor connects the first sampling and keeps loop, first frequency measuring circuit, decoding circuit, Combinational Logic Control output unit, combined floodgate logic control output unit; The second processor connects synchronous logic control output unit, the second sampling keeps loop, second frequency measuring circuit.
As a preferred embodiment of the present invention, described anti-tampering and power supply supervisory circuit is in order to prevent the interference of external signal to processor and electric power loop is carried out to self monitoring, comprise ac filter circuit, open into filtering light every circuit, light every circuit output drive, power monitor circuit.
As a preferred embodiment of the present invention, described system also comprises reset circuit, display, input unit, memory, clock circuit, GPS module, serial communication port, supervisory control comuter; Described reset circuit, display, input unit, memory, clock circuit, GPS module are connected with processing unit respectively; Described supervisory control comuter is connected with processing unit by serial communication port.
Generator automatic presynchronization method for real-time monitoring and system that the present invention proposes, its beneficial effect is:
The present invention is the digital auto-parallel device of microcomputer type of new generation, has overcome the shortcoming of analogue means completely, and high precision computation frequency difference and phase difference close a floodgate pre-set time with the determine precision of Millisecond.In both sides, pressure reduction is qualified, and frequency difference is qualified, in the situation that the leading time of adjusting and breaker mechanical match operate time, can realize and closing a floodgate without impacting fast.
The present invention is exclusively used between all kinds generator sets in power plant and electrical network side by side, between substation bus bar and circuit side by side.There is fabulous man-machine interface, closing speed is fast, precision is high, safe and reliable, stable performance, simple to operate, without advantages such as debugging, simultaneously and network process in, too high or too low for system voltage, system frequency is too high or too low, unit overtension or too low, machine class frequency is too high or too low and overexcitation etc., device has alarm function; Provide and the port of host computer simultaneously, can facilitate the real-time monitoring of implement device.
In addition, the present invention specifically possesses following advantage:
1, the present invention treat by control and set speed adjustment, pressure regulation realize frequency and voltage from motion tracking, frequency difference, pressure reduction are entered in accurate same period of allowed band as soon as possible, at θ=θ dq=Δ ω Tdq+ Δ ω ' Tdq2/2, send closing pulse when T=Tdq, realize rapid combination.With the different phase times of frequency, also can send suitable speed-regulating pulse to shorten process arranged side by side.Owing to taking into account angular speed (Δ ω) and angular acceleration (Δ ω '), while guaranteeing breaker closing, Δ δ approaches zero.
2, the present invention has the too high and underfrequency defencive function of overvoltage and under voltage protection, frequency.
3, occur, with the different phase times of frequency, automatically breaking with frequency situation in system and generator, realize generator rapid combination.
4, the present invention adopts the combined floodgate order of two hardware and software composition, accurately controls and allows combined floodgate angular range, closed a floodgate opportunity by microcomputer circuit accurate Calculation zero degree, and reliability and fail safe that the design assurance device of dual circuit closes a floodgate.
5, the present invention can be used alone, also can be used in conjunction with supervisory control system, realize remote control same period, by with supervisory control system communication, can carry out definite value read-write, close a floodgate and report and close a floodgate to record and send, interface is RS485 mode, and agreement adopts MODBUS-RTU agreement, baud rate is appointed fixed, is generally 9600bit/s.Device, except having inspection synchronization function, also possesses inspection (side is with no pressure or both sides are with no pressure) with no pressure and the automatic rapid closing function of single supply cyclization.
6, the present invention has the Chinese LCD screen menu demonstration of 32*144 dot matrix composition, is convenient to setting and the amendment of supervision and definite value, and after device power down, definite value parameter can not be lost.
7, the present invention has asynchronous switch-on, event recording function, all data record of asynchronous switch-on, event moment each time can be got off, at most can 32 asynchronous switch-on historical records of index.Especially each grid-connected after, sense switch operate time automatically, be convenient to the correction of leading time.
8, the present invention has voltage and angle software fixed value compensation function, need not be equipped with corner transformer, can realize angle compensation.
9, the present invention has time clock feature, read clock in real time, and can record the time of origin of each event.
10, the present invention has GPS time adjustment function, and interface is RS485 mode, can carry out clock synchronous with gps clock.
Brief description of the drawings
Fig. 1 is the composition schematic diagram of generator automatic presynchronization real-time monitoring system of the present invention.
Fig. 2 is the application schematic diagram of the real-time monitoring system same period in generator connecting in parallel with system process.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
Embodiment mono-
The present invention discloses a kind of generator automatic presynchronization method for real-time monitoring, described method comprises: will treat that also the sine wave signal of both sides is converted to digital signal, then adopt the method for science to carry out computing to it by processing unit, thereby accurately determine combined floodgate output time.
Described method also comprises: both sides signal is carried out to frequency and voltage sample, after data processing, on display, show, in the time that both sides frequency difference is defective, according to the size of departure, send the regulating impulse that length is different, and realize proportional control according to the variable quantity of generator frequency after regulating.
Refer to Fig. 1, the present invention discloses a kind of generator automatic presynchronization real-time monitoring system simultaneously, and described system comprises: processing unit, signal input and translation circuit, instruction and control output circuit, anti-tampering and power supply supervisory circuit; Described signal input and translation circuit, instruction and control output circuit, anti-tampering and power supply supervisory circuit is connected with processing unit respectively; Described signal input and translation circuit are in order to treating that also the sine wave signal of both sides is converted to digital signal; Described processing unit adopts the method for science to carry out computing to it, thereby accurately determines combined floodgate output time; Described instruction and control output circuit are in order to be sent to generator by output signal.
Described signal input and translation circuit carry out frequency and voltage sample to both sides signal, after data processing, can on display, show; Described processing unit, in the time that both sides frequency difference is defective, according to the size of departure, sends the regulating impulse that length is different, and realizes proportional control according to the variable quantity of generator frequency after regulating.
In the present embodiment, described signal input and translation circuit comprise first signal input and conversion module, secondary signal input and conversion module.
Described first signal input and conversion module comprise that the first synchronous voltage switch unit, the first ac circuit unit, the first zero passage comparing unit, the first sampling keep loop, first frequency measuring circuit; The first ac circuit unit keeps loop to be connected with the first synchronous voltage switch unit, the first zero passage comparing unit, the first sampling respectively, and the first zero passage comparing unit is connected with first frequency measuring circuit.
Described secondary signal input and conversion module comprise that the second synchronous voltage switch unit, the second ac circuit unit, the second zero passage comparing unit, the second sampling keep loop, second frequency measuring circuit; The second ac circuit unit keeps loop to be connected with the second synchronous voltage switch unit, the second zero passage comparing unit, the second sampling respectively, and the second zero passage comparing unit is connected with second frequency measuring circuit.
The input of described signal and translation circuit also comprise that the object input circuit same period that connects successively, filtering light are every circuit, decoding circuit, and decoding circuit is connected with processing unit.
Described instruction and control output circuit comprise Combinational Logic Control output unit, the first photoelectricity isolation output driver element, signal sending controling unit, speed regulating control unit, Regulation Control unit; The first photoelectricity isolation output driver element is connected with Combinational Logic Control output unit, signal sending controling unit, speed regulating control unit, Regulation Control unit respectively.
Described instruction and control output circuit also comprise combined floodgate logic control output unit, the second photoelectricity isolation output driver element, switching-in control unit, synchronous logic control output unit; The second photoelectricity isolation output driver element is connected with combined floodgate logic control output unit, switching-in control unit, synchronous logic control output unit respectively.
In the present embodiment, described processing unit comprises first processor, the second processor; Described first processor connects the first sampling and keeps loop, first frequency measuring circuit, decoding circuit, Combinational Logic Control output unit, combined floodgate logic control output unit; The second processor connects synchronous logic control output unit, the second sampling keeps loop, second frequency measuring circuit.
Described anti-tampering and power supply supervisory circuit is in order to prevent the interference of external signal to processor and electric power loop is carried out to self monitoring, comprise ac filter circuit, open into filtering light every circuit, light every circuit output drive, power monitor circuit.
In addition, described system also comprises reset circuit, display, input unit, memory, clock circuit, GPS module, serial communication port, supervisory control comuter; Described reset circuit, display, input unit, memory, clock circuit, GPS module are connected with processing unit respectively; Described supervisory control comuter is connected with processing unit by serial communication port.
Refer to Fig. 2, the present invention has disclosed the application process of synchronous device in generator connecting in parallel with system process.The basic functional principle of this device is first will to treat and the sine wave signal of both sides is converted to digital signal, then adopts the method for science to carry out computing to it by computer processor, thus accurate definite combined floodgate output time.Device carries out frequency and voltage sample to both sides signal simultaneously, after data processing, can on LCD, show, in the time that both sides frequency difference is defective, according to the size of departure, send the regulating impulse that length is different, and realize proportional control according to the variable quantity of generator frequency after regulating, approach and dead-beat regulating effect thereby reach fast.
Whole device is taking 32 single-chip microcomputer STM32 of a new generation of ST company as core, be equipped with signal input and translation circuit, parameter setting and display circuit, instruction and control output circuit, anti-tampering and power supply supervisory circuit forms a real-time monitoring system, referring to theory diagram.
In sum, generator automatic presynchronization method for real-time monitoring and system that the present invention proposes, overcome the shortcoming of analogue means completely, and high precision computation frequency difference and phase difference close a floodgate pre-set time with the determine precision of Millisecond.In both sides, pressure reduction is qualified, and frequency difference is qualified, in the situation that the leading time of adjusting and breaker mechanical match operate time, can realize and closing a floodgate without impacting fast.
The present invention is exclusively used between all kinds generator sets in power plant and electrical network side by side, between substation bus bar and circuit side by side.There is fabulous man-machine interface, closing speed is fast, precision is high, safe and reliable, stable performance, simple to operate, without advantages such as debugging, simultaneously and network process in, too high or too low for system voltage, system frequency is too high or too low, unit overtension or too low, machine class frequency is too high or too low and overexcitation etc., device has alarm function; Provide and the port of host computer simultaneously, can facilitate the real-time monitoring of implement device.
Here description of the invention and application is illustrative, not wants scope of the present invention to limit in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and for those those of ordinary skill in the art, the various parts of the replacement of embodiment and equivalence are known.Those skilled in the art are noted that in the situation that not departing from spirit of the present invention or substantive characteristics, and the present invention can be with other form, structure, layout, ratio, and realize with other assembly, material and parts.In the situation that not departing from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (6)
1. a generator automatic presynchronization real-time monitoring system, is characterized in that, described system comprises: processing unit, signal input and translation circuit, instruction and control output circuit, anti-tampering and power supply supervisory circuit;
Described signal input and translation circuit, instruction and control output circuit, anti-tampering and power supply supervisory circuit is connected with processing unit respectively;
Described signal input and translation circuit are in order to treating that also the sine wave signal of both sides is converted to digital signal;
Described processing unit carries out computing to it, thereby accurately determines combined floodgate output time;
Described instruction and control output circuit are in order to be sent to output signal each control section of generator and to need grid-connected switch;
Described signal input and translation circuit comprise first signal input and conversion module, secondary signal input and conversion module;
Described first signal input and conversion module comprise that the first synchronous voltage switch unit, the first ac circuit unit, the first zero passage comparing unit, the first sampling keep loop, first frequency measuring circuit; The first ac circuit unit keeps loop to be connected with the first synchronous voltage switch unit, the first zero passage comparing unit, the first sampling respectively, and the first zero passage comparing unit is connected with first frequency measuring circuit;
Described secondary signal input and conversion module comprise that the second synchronous voltage switch unit, the second ac circuit unit, the second zero passage comparing unit, the second sampling keep loop, second frequency measuring circuit; The second ac circuit unit keeps loop to be connected with the second synchronous voltage switch unit, the second zero passage comparing unit, the second sampling respectively, and the second zero passage comparing unit is connected with second frequency measuring circuit;
The input of described signal and translation circuit also comprise that the object input circuit same period that connects successively, filtering light are every circuit, decoding circuit, and decoding circuit is connected with processing unit;
Described instruction and control output circuit comprise Combinational Logic Control output unit, the first photoelectricity isolation output driver element, signal sending controling unit, speed regulating control unit, Regulation Control unit; The first photoelectricity isolation output driver element is connected with Combinational Logic Control output unit, signal sending controling unit, speed regulating control unit, Regulation Control unit respectively;
Described instruction and control output circuit also comprise combined floodgate logic control output unit, the second photoelectricity isolation output driver element, switching-in control unit, synchronous logic control output unit; The second photoelectricity isolation output driver element is connected with combined floodgate logic control output unit, switching-in control unit, synchronous logic control output unit respectively;
Described processing unit comprises first processor, the second processor; Described first processor connects the first sampling and keeps loop, first frequency measuring circuit, decoding circuit, Combinational Logic Control output unit, combined floodgate logic control output unit; The second processor connects synchronous logic control output unit, the second sampling keeps loop, second frequency measuring circuit.
2. generator automatic presynchronization real-time monitoring system according to claim 1, is characterized in that:
Described signal input and translation circuit carry out frequency and voltage sample to both sides signal, after data processing, on display, show;
Described processing unit, in the time that both sides frequency difference is defective, according to the size of departure, sends the regulating impulse that length is different, and realizes proportional control according to the variable quantity of generator frequency after regulating.
3. generator automatic presynchronization real-time monitoring system according to claim 1, is characterized in that:
Described anti-tampering and power supply supervisory circuit is in order to prevent the interference of external signal to processor and electric power loop is carried out to self monitoring, comprise ac filter circuit, open into filtering light every circuit, light every circuit output drive, power monitor circuit.
4. generator automatic presynchronization real-time monitoring system according to claim 1, is characterized in that:
Described system also comprises reset circuit, display, input unit, memory, clock circuit, GPS module, serial communication port, supervisory control comuter;
Described reset circuit, display, input unit, memory, clock circuit, GPS module are connected with processing unit respectively; Described supervisory control comuter is connected with processing unit by serial communication port.
5. a method for real-time monitoring for generator automatic presynchronization real-time monitoring system claimed in claim 1, is characterized in that, described method comprises:
By treating that also the sine wave signal of both sides is converted to digital signal, then by processing unit, it is carried out to computing, thereby accurately determine combined floodgate output time.
6. method for real-time monitoring according to claim 5, is characterized in that:
Described method also comprises: both sides signal is carried out to frequency and voltage sample, after data processing, on display, show, in the time that both sides frequency difference is defective, according to the size of departure, send the regulating impulse that length is different, and realize proportional control according to the variable quantity of generator frequency after regulating.
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| CN201210104694.4A CN102856929B (en) | 2012-04-10 | 2012-04-10 | Automatic quasi-synchronization real-time power generator monitoring method and system |
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| CN105762839B (en) * | 2016-03-07 | 2018-12-11 | 广东技术师范学院 | A method of magnetic pole slippage for identification |
| WO2020093762A1 (en) * | 2018-11-06 | 2020-05-14 | 上海良信电器股份有限公司 | Communication function-based synchronization detection method and device for circuit breaker |
| CN110707753B (en) * | 2019-09-23 | 2023-06-23 | 大唐陕西发电有限公司西安热电厂 | Synchronous device closing loop for three-half main wiring |
| CN115542146B (en) * | 2022-11-30 | 2023-03-24 | 南方电网调峰调频发电有限公司 | Method, device, equipment and medium for synchronously testing outlet switch device of generator set |
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| CN201255830Y (en) * | 2008-07-29 | 2009-06-10 | 国网电力科学研究院 | PLC automatic pre-synchronization module |
| CN201541133U (en) * | 2009-12-07 | 2010-08-04 | 江苏科技大学 | Embedded automatic quasi-synchronization parallel operation control device for ship power station |
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| KR101061232B1 (en) * | 2009-09-29 | 2011-09-05 | 한국전력공사 | Multi-terminal synchronous feeding device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201255830Y (en) * | 2008-07-29 | 2009-06-10 | 国网电力科学研究院 | PLC automatic pre-synchronization module |
| CN201541133U (en) * | 2009-12-07 | 2010-08-04 | 江苏科技大学 | Embedded automatic quasi-synchronization parallel operation control device for ship power station |
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Effective date of registration: 20170602 Address after: 211000 industrial horticulture 24-2, Pukou District, Jiangsu, Nanjing, Qiaolin Patentee after: NANJING BAOHETAIHE ELECTRIC POWER TECHNOLOGY Co.,Ltd. Address before: 505, room 139, Ma 210009, Nanjing, Jiangsu Patentee before: Jin Zhaoan |
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