CN100452684C - Method for measuring transmission time-delay of telemechanical system by GPS - Google Patents

Abstract

The present invention relates to a method for measuring transmission time-delay of a remote-action system by GPS. In order to accurately measure signals sent out from a power station end, the signals pass through the delay time from a plurality of signal interfaces to a master control station. The present invention adopts GPS satellite positioning reception technique to measure the delay time of the system, an analog quantity changing time delay test uses a signal generator to simulate the out of a transmitter and to be switched in an input module, and large data jumping and changing moments generated in a monitoring and a data collecting system libraries are recorded by using the downward jump of a sawtooth signal, namely the delay time transmitted by the analog quantity change of the system. A synchronous output signal of a GPS receiver and a synchronous output signal of a signal generator are concurrently switched in a dual-trace oscilloscope which is used for calculating the downward jumping absolute time of the sawtooth signal of the signal generator, the absolute time with large data jump is recorded in a time SCADA library by GPS, and a difference value of the downward jumping absolute time and the absolute time with large data jump is the delay time to be measured. The present invention has the advantages of high measuring accuracy.

Description

Measure the method for telecontrol system transmission delay with GPS

Technical field

The present invention relates to a kind of global position system of using, measure the method for telecontrol system transmission delay, be mainly used in that large-scale electricity (factory) is stood and master station between, the signal that the power station has an accident suddenly, be transferred to the time of master station time-delay,, take corresponding control measure so that main website reacts rapidly, this delay requirement is the smaller the better, and it is an important indicator of checking that this transmitting device is whether up to standard.

Background technology

Along with rapid development of computer technology, the telemechanical apparatus of electric power system develops into distributed terminal unit device (RTU) afterwards by original centralized terminal unit device.The supervisory control system construction in large-scale power station and power plant in recent years, replaced traditional terminal unit device (RTU) device, complexity of its system configuration and information pass more than the interface, make people more and more pay attention to message transmission real-time problem, signal is long more by the time-delay of the transmission system of complexity, be unfavorable for that more master control department takes regulation measure rapidly, therefore, signal transmission system is stipulated the standard of a time delay, still, how to have checked the time of delay of this system, still neither one scientific methods at present, the general now stopwatch that adopts is by the signal delay time between phone mensuration power station and the master station, very inaccurate with password.

Summary of the invention

In order accurately to measure the signal that the power station end sends, the many signaling interfaces of process are to the time of delay between the master station, the present invention adopts gps satellite location reception technique, measure the time of delay of this system, it is to utilize the output of signal generator simulation transmitter and insert input module that simulate amount changes delay test, utilize the following of sawtooth signal to jump, in the moment of the big data saltus step that takes place in the record supervisory control and data acqui sition system storehouse, promptly the simulate amount of system changes transmission delay time.The synchronous farm-out signal of GPS receiving system and the synchronization output signal of signal generator insert double-trace scope simultaneously, absolute time in order to the edge that jumps under the signal calculated generator sawtooth signal, the absolute time of the big data saltus step of in supervisory control and data acquisition (SCADA) (SCADA) storehouse of GPS, noting of generation to the time, the difference of the two, the time of delay that will measure exactly.Concrete grammar is:

(1) introduces gps satellite location clock signal respectively at transmission initiating terminal and transmission terminal, in the gps clock signal input a pair of mark oscilloscope that initiating terminal is introduced, the gps clock signal that terminal is introduced and supervisory control and data acquisition (SCADA) (SCADA) clock synchronization of data processor;

(2) initiating terminal is established a signal generator, produces a square wave and sawtooth waveforms, and the following of square wave jumps along jumping along synchronously with the following of sawtooth waveforms, square wave inputs to aforementioned double-trace scope another port, sawtooth waveforms is delivered to terminal unit device (RTU) measurement and control unit, and through main control unit, transfers to terminal after modulation;

(3) on the double-trace scope time shaft, obtain square wave back edge time corresponding t ₀, the corresponding time t of GPS synchronous signal impulse _s, both differences are t _s-t ₀=Δ t;

(4) record in terminal that to jump along the time under the sawtooth waveforms that initiating terminal transmission comes be t _S1

(5) time of sawtooth waveforms time-delay is t _S1-t _s+ Δ t=t _d

Advantage of the present invention is, certainty of measurement height of the present invention, the error of having avoided traditional manual measurement to cause is if master station computer and gps receiver are realized clock synchronization by the IRIG-B addressable port, then can guarantee Millisecond to the time precision, otherwise guarantee a second class precision at least.The portable gps receiver at factory station can guarantee Millisecond to the time precision, like this, the time accuracy of measurement result can guarantee level second at least, such accuracy can satisfy quantities precision needs.

In addition, the present invention also can be applicable to transmitter input and AC sampling also applicable to various supervisory control systems and all kinds of terminal unit device (RTU), can carry out simulate amount variation and the test of quantity of state displacement transmission delay.

Description of drawings

Accompanying drawing 1 is a calcspar of the present invention.

Accompanying drawing 2 is square wave and GPS synchronizing clock signals random site schematic diagrames on double-trace scope of signal generator.

Embodiment

See also shown in the accompanying drawing 1,2, signal generator 1 output two road signals, one the tunnel is sawtooth waveforms, one the tunnel is square wave, the clock signal 11 input double-trace scopes 2 of square wave and gps satellite location receivers, the following of square wave jumps along jumping along synchronously with the following of sawtooth waveforms, is t on the following edge that jumps that can see square wave on the double-trace scope 2 on oscillographic time shaft ₀, be t on the corresponding time shaft of the clock pulse of GPS _s, both differences are t _s-t ₀=Δ t records in terminal that the time of jumping is t under the sawtooth waveforms that initiating terminal transmission comes _S1, the modulus change transmission delay is t like this _S1-t _s+ Δ t.To be minute synchronization output signal trigger mode that utilizes the GPS receiving system insert input module like the quantity of state displacement and through the output node of a relay to quantity of state displacement delay test, also insert simultaneously wherein one tunnel input of double-trace scope, this relay is subjected to minute synchronizing signal of gps receiver at t _sTriggering constantly, after Δ t carries out time-delay at t ₀Relay output action constantly, with GPS to the time supervisory control and data acquisition (SCADA) (SCADA) storehouse in note the absolute time t of the quantity of state displacement of generation _S1, the absolute time t that on double-trace scope, records _s+ Δ t=t ₀, the propagation delay time of this quantity of state is t _S1-t _s-Δ t.

In accompanying drawing 1 calcspar, sawtooth waveforms is sent into measurement and control unit 3 earlier, and behind master unit 4, modulator 5, demodulator 6, front end processor 7 to the main website district arrive database 8, man-computer interface 9, display screen 10 at last; At the clock sync signal of front end processor input GPS receiving system, make gps clock signal and supervisory control and data acquisition (SCADA) (SCADA) to the time.

Claims (1)

1, a kind of method of measuring the telecontrol system transmission delay with GPS is characterized in that:

(1) introduces gps satellite location clock signal respectively at transmission initiating terminal and transmission terminal, in the gps clock signal input a pair of mark oscilloscope that initiating terminal is introduced, the gps clock signal that terminal is introduced and the supervisory control and data acquisition (SCADA) clock synchronization of data processor;

(2) initiating terminal is established a signal generator, produces a square wave and sawtooth waveforms, and the following of square wave jumps along jumping along synchronously with the following of sawtooth waveforms, square wave inputs to aforementioned double-trace scope another port, sawtooth waveforms is delivered to terminal unit device measurement and control unit, and through main control unit, transfers to terminal after modulation;

(3) on the double-trace scope time shaft, obtain square wave back edge time corresponding t ₀, the corresponding time t of GPS synchronous signal impulse _s, both differences are t _s-t ₀=Δ t;

(4) record in terminal that to jump along the time under the sawtooth waveforms that initiating terminal transmission comes be t _S1

(5) time of sawtooth waveforms time-delay is t _S1-t _s+ Δ t=t _d

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