CN102856929A - 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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- CN102856929A CN102856929A CN2012101046944A CN201210104694A CN102856929A CN 102856929 A CN102856929 A CN 102856929A CN 2012101046944 A CN2012101046944 A CN 2012101046944A CN 201210104694 A CN201210104694 A CN 201210104694A CN 102856929 A CN102856929 A CN 102856929A
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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 the 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; Simultaneously, 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 excitation, and regulate its voltage and frequency, when satisfying condition arranged side by side (being that voltage, frequency, phase place are identical), with the generator input coefficient, if in the ideal case, the gate out switch of generator is closed a floodgate, and then the circulation in the 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.
The generator quasi-synchronization paralleling is very important operation of electric power system, in the moment of generator input coefficient paired running, often is 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, so power department general and automation are classified a vital task of Automation of Electric Systems as.
Traditional manual synchronous operation phase error is larger, and also not high enough based on traditional accurate same period of the auto-parallel device precision of analog circuit, 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 with 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 the combined floodgate output time.
As a preferred embodiment of the present invention, described method also comprises: the both sides signal is carried out frequency and voltage sample, through showing at display after the data processing, when the both sides frequency difference is defective, size according to departure, send the different regulating impulse of length, 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, indication and control output circuit, anti-tampering and power supply supervisory circuit; Described signal input and translation circuit, indication and control output circuit, anti-tampering and power supply supervisory circuit are connected with processing unit respectively; Described signal input and translation circuit will be in order to will treat 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 the combined floodgate output time; Described indication and control output circuit are in order to be sent to generator with output signal.
As a preferred embodiment of the present invention, described signal input and translation circuit carry out frequency and voltage sample to the both sides signal, can show at display after processing through data; Described processing unit according to the size of departure, sends the different regulating impulse of length when the both sides frequency difference is defective, 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 the 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 the 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 the 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 the second frequency measuring circuit;
The input of described signal and translation circuit also comprise the object input circuit same period that connects successively, filtering light every circuit, decoding circuit, and decoding circuit is connected with processing unit;
Described indication 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 indication 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 carries out self monitoring in order to prevent external signal to the interference of processor and to electric power loop, 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 fully, and high precision computation frequency difference and phase difference are with the determine precision combined floodgate pre-set time of Millisecond.Pressure reduction is qualified in both sides, and frequency difference is qualified, in the situation that the leading time of adjusting and breaker mechanical match operate time, can realize 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.Has fabulous man-machine interface, closing speed is fast, precision is high, safe and reliable, stable performance, simple to operate, need not the 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, the unit overtension or excessively low, the machine class frequency is too high or too low and overexcitation etc., device has alarm function; Port with host computer is provided simultaneously, can makes things convenient for 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 the allowed band as soon as possible, at θ=θ dq=Δ ω Tdq+ Δ ω ' Tdq2/2, namely send closing pulse during 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 '), Δ δ approaches zero when guaranteeing breaker closing.
2, the present invention has overvoltage and under voltage protection, frequency is too high and the underfrequency defencive function.
3, occur automatically breaking with the frequency situation with the different phase times of frequency from generator in system, realize the generator rapid combination.
4, the present invention adopts the combined floodgate order that two hardware and software form, and accurately control allows the combined floodgate angular range, is closed a floodgate opportunity reliability and fail safe that the design assurance device of dual circuit closes a floodgate by microcomputer circuit accurate Calculation zero degree.
5, the present invention can use separately, also can be used in conjunction with supervisory control system, realize remote control same period, by with the supervisory control system communication, can carry out sending on definite value read-write, combined floodgate report and the record that closes a floodgate, interface is the RS485 mode, and agreement adopts the MODBUS-RTU agreement, baud rate is appointed fixed, is generally 9600bit/s.Device also possesses inspection with no pressure (a side with no pressure or both sides with no pressure) and the automatic rapid closing function of single supply cyclization except having the inspection synchronization function.
6, the present invention has the Chinese LCD screen menu that the 32*144 dot matrix forms and shows, is convenient to monitor and setting and the modification of definite value, and after the device power down, the definite value parameter can not lost.
7, the present invention has asynchronous switch-on, event recording function, all data record of asynchronous switch-on each time, event moment can be got off, but maximum 32 asynchronous switch-on historical records of index.Especially at every turn after being incorporated into the power networks, automatically sense switch operate time, 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 the corner transformer, can realize angle compensation.
9, the present invention has time clock feature, real-time read clock, and can record the time of origin of each event.
10, the present invention has the GPS time adjustment function, and interface is the RS485 mode, can carry out clock synchronous with gps clock.
Description of 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 the 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 one
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 that it is carried out computing by processing unit, thereby accurately determine the combined floodgate output time.
Described method also comprises: the both sides signal is carried out frequency and voltage sample, through showing at display after the data processing, when the both sides frequency difference is defective, according to the size of departure, send the different regulating impulse of length, and realize proportional control according to the variable quantity of generator frequency after regulating.
See also 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, indication and control output circuit, anti-tampering and power supply supervisory circuit; Described signal input and translation circuit, indication and control output circuit, anti-tampering and power supply supervisory circuit are connected with processing unit respectively; Described signal input and translation circuit will be in order to will treat that also the sine wave signal of both sides is converted to digital signal; Described processing unit adopts the method for science that it is carried out computing, thereby accurately determines the combined floodgate output time; Described indication and control output circuit are in order to be sent to generator with output signal.
Described signal input and translation circuit carry out frequency and voltage sample to the both sides signal, can show at display after processing through data; Described processing unit according to the size of departure, sends the different regulating impulse of length when the both sides frequency difference is defective, 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 the 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 the 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 the 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 the second frequency measuring circuit.
The input of described signal and translation circuit also comprise the object input circuit same period that connects successively, filtering light every circuit, decoding circuit, and decoding circuit is connected with processing unit.
Described indication 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 indication 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 carries out self monitoring in order to prevent external signal to the interference of processor and to electric power loop, 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.
See also Fig. 2, the present invention has disclosed the application process of synchronous device in the generator connecting in parallel with system process.The basic functional principle of this device is to treat that first also the sine wave signal of both sides is converted to digital signal, then adopts the method for science that it is carried out computing by computer processor, thereby accurately determines the combined floodgate output time.Device carries out frequency and voltage sample to the both sides signal simultaneously, through showing at LCD after the data processing, when the both sides frequency difference is defective, size according to departure, send the different regulating impulse of length, and according to the variable quantity realization proportional control of regulating rear generator frequency, approach and dead-beat regulating effect thereby reach fast.
Whole device is take 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, indication 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 have overcome the shortcoming of analogue means fully, and high precision computation frequency difference and phase difference close a floodgate pre-set time with the determine precision of Millisecond.Pressure reduction is qualified in both sides, and frequency difference is qualified, in the situation that the leading time of adjusting and breaker mechanical match operate time, can realize 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.Has fabulous man-machine interface, closing speed is fast, precision is high, safe and reliable, stable performance, simple to operate, need not the 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, the unit overtension or excessively low, the machine class frequency is too high or too low and overexcitation etc., device has alarm function; Port with host computer is provided simultaneously, can makes things convenient for the Real Time Monitoring of implement device.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that in the situation that do not break away 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 do not break away from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (7)
1. a generator automatic presynchronization method for real-time monitoring is characterized in that, described method comprises:
With treating that also the sine wave signal of both sides is converted to digital signal, then by processing unit it is carried out computing, thereby accurately determine the combined floodgate output time.
2. generator automatic presynchronization method for real-time monitoring according to claim 1 is characterized in that:
Described method also comprises: the both sides signal is carried out frequency and voltage sample, through showing at display after the data processing, when the both sides frequency difference is defective, according to the size of departure, send the different regulating impulse of length, and realize proportional control according to the variable quantity of generator frequency after regulating.
3. a generator automatic presynchronization real-time monitoring system is characterized in that, described system comprises: processing unit, signal input and translation circuit, indication and control output circuit, anti-tampering and power supply supervisory circuit;
Described signal input and translation circuit, indication and control output circuit, anti-tampering and power supply supervisory circuit are connected with processing unit respectively;
Described signal input and translation circuit will be in order to will treat 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 the combined floodgate output time;
Described indication and control output circuit are in order to each control section that output signal is sent to generator and the switch that need to be incorporated into the power networks.
4. generator automatic presynchronization real-time monitoring system according to claim 3 is characterized in that:
Described signal input and translation circuit carry out frequency and voltage sample to the both sides signal, can show at display after processing through data;
Described processing unit according to the size of departure, sends the different regulating impulse of length when the both sides frequency difference is defective, and realizes proportional control according to the variable quantity of generator frequency after regulating.
5. generator automatic presynchronization real-time monitoring system according to claim 3 is characterized in that:
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 the 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 the 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 the 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 the second frequency measuring circuit;
The input of described signal and translation circuit also comprise the object input circuit same period that connects successively, filtering light every circuit, decoding circuit, and decoding circuit is connected with processing unit;
Described indication 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 indication 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.
6. generator automatic presynchronization real-time monitoring system according to claim 3 is characterized in that:
Described anti-tampering and power supply supervisory circuit carries out self monitoring in order to prevent external signal to the interference of processor and to electric power loop, comprise ac filter circuit, open into filtering light every circuit, light every circuit output drive, power monitor circuit.
7. generator automatic presynchronization real-time monitoring system according to claim 3 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.
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| CN105762839A (en) * | 2016-03-07 | 2016-07-13 | 广东技术师范学院 | Method for recognizing slip of magnetic pole |
| CN110707753A (en) * | 2019-09-23 | 2020-01-17 | 大唐陕西发电有限公司西安热电厂 | Synchronous device closing loop for three-second main connection |
| CN110794247A (en) * | 2019-08-08 | 2020-02-14 | 天生桥二级水力发电有限公司天生桥水力发电总厂 | Automatic device inspection platform |
| 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 |
| WO2024113731A1 (en) * | 2022-11-30 | 2024-06-06 | 南方电网调峰调频发电有限公司检修试验分公司 | Generator set circuit breaker apparatus synchronization test method and apparatus, device, and medium |
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| CN105762839A (en) * | 2016-03-07 | 2016-07-13 | 广东技术师范学院 | Method for recognizing slip of magnetic pole |
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| 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 |
| WO2024113731A1 (en) * | 2022-11-30 | 2024-06-06 | 南方电网调峰调频发电有限公司检修试验分公司 | Generator set circuit breaker apparatus synchronization test method and apparatus, device, and medium |
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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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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 |