CN2906632Y

CN2906632Y - Portable dynamic PMU performance tester

Info

Publication number: CN2906632Y
Application number: CN 200520046578
Authority: CN
Inventors: 丁孝华; 赵宗强; 高翔; 孙国成; 毕晓亮
Original assignee: HUADONG POWER INFORMATION ENGINEERING TECH Co Ltd SHANGHAI; SHANGHAI NANRI INDUSTRIAL Co Ltd
Current assignee: Shanghai Rui Hao Information Technology Co., Ltd.
Priority date: 2005-11-16
Filing date: 2005-11-16
Publication date: 2007-05-30
Anticipated expiration: 2015-11-16

Abstract

The utility model relates to a portable PMU dynamic performance testing instrument, comprising a GPS clock signal generator connected with a digital signal processing unit and a high-speed analog sample signal input unit. The acquired phase current and phase voltage of external transmission network are transmitted to an engine shaft key phase pulse generating unit and the digital signal processing unit respectively; a switching value input unit is also provided; the engine shaft key phase pulse generating unit is used for transforming the port three-phase voltage and current signals input the engine from outside into analog engine shaft key phase pulse signal, which has the same frequency with the port voltage through wave formation; after the signal is optoelectronic isolated, a changeover switch is used for choosing the external engine shaft key phase pulse input or internal analog engine shaft key phase signal output; a switching value input unit is a relay contact output circuit used for collecting the shifting signal of the switch and outputting the adjustable shifting time through high-voltage optical coupling isolation for checking the time accuracy of PMU instrument collecting signals, so as to solve the problems of field performance checking and error checking of wide area synchronous phasor.

Description

Portable PMU dynamic characteristics measuring instrument

Technical field

The utility model device is a kind of on-the-spot special portable formula PMU dynamic characteristics measuring instrument that phasor measuring set (PMU) is carried out dynamic property, basic function, be applied to electrical power system wide-area measuring system (WAMS) or electrical network dynamic monitoring system, the phasor measuring set (PMU) that is installed on generating plant and transformer station carried out the test such as Performance Detection, function check of the dynamic phasor of on-the-spot electrical network.Portable PMU dynamic characteristics measuring instrument is applicable to the measuring accuracy of field quick detection PMU device high-speed sampling generator built-in potential merit angle, unit and line voltage distribution and electric current phasor, detect the measuring accuracy of direct current signals such as unit phase discriminating pulse, tacho-pulse, exciting current, voltage, the gps satellite timing synchronization performance of test PMU device.Belong to electricity net safety stable Dynamic Monitoring field.

Background technology

Because the U.S., Europe, Russia recur big electricity net safety stable and destroys and cause large area blackout, national economy and social stability caused have a strong impact on.Move in order to ensure area electric network safety stabilization, each big electrical network is all strengthened electrical network dynamic monitoring Study on Technology both at home and abroad, accelerate the application of WAMS (WAMS) and phasor measuring set (PMU), in a large number in some load-center substations and the installation phasor measuring set PMU of big power station.

Because voltage, current amplitude and the phase angle of genset and transmission line of electricity change in time fast, the dynamic stability degree that directly reflects electric system, realize the synchronous phasor measuring device (PMU) of detection of dynamic, use current up-to-date science and technology and international standard, comprise: the measuring technique that gps satellite Clock Synchronization Technology, the high-speed sampling of 4800-10000 point/second and discrete digital are handled, the detection technique at unit built-in potential merit angle, computer network communication technology etc.

At present,, still do not have the suitable on-the-spot portable PMU dynamic characteristics measuring instrument that detects both at home and abroad, be difficult to guarantee that the performance of PMU device satisfies the requirement of electrical network dynamic stability monitoring the PMU device of the new covers up to a hundred new and high technology like this of installing in the whole nation.At present, can only adopt the high-speed figure oscillograph in the laboratory, the sampled data of voltage, current waveform in record a period of time, calculate by numerical analysis, the performance of PMU device is carried out sample testing, this method complicated operation and wasting time and energy, be not suitable for PMU device to a large amount of installation factory station, Performance Detection and the error done before putting into operation are checked, and more can't detect the measuring accuracy of PMU device to unit built-in potential merit angle, directly have influence on the correctness that the electrical network dynamic stability is judged.Therefore, electric system demands researching and developing portable PMU dynamic characteristics measuring instrument urgently.

Summary of the invention

For solving the problem of aforementioned existence, to being distributed in each factory's on-the-spot synchronous phasor measuring device (PMU) in station, the utility model provides a kind of portable PMU dynamic characteristics measuring instrument, guarantees that various places PMU device provides in real time for electrical network dynamic stability supervisory system and phasor data accurately.

The technical solution of the utility model is: a gps clock signal is connected with digital signal processing unit, one high-speed sampling analog input unit, gather phase current, the phase voltage of external electrical network, one the road delivers to alternator shaft key phase pulse generation unit, one the road delivers to digital signal processing unit, other is provided with the switching value input block and is connected with digital signal processing unit, and the signal after digital signal processing unit will be handled is delivered to network communication interface;

Alternator shaft key phase pulse generation unit, be generator machine end three-phase voltage, the current signal of the outside being imported this device, through wave shaping, be transformed to simulation unit rotating shaft key phase pulse signal with the set end voltage same frequency, after the photoelectricity isolation, adopt change-over switch to select to export by external generator rotating shaft key phase pulse input or by internal simulation alternator shaft key signal;

Described switch input block is to adopt the high pressure light-coupled isolation to gather the displacement signal of switch, exports mutual actuation time of adjustable relay tip output circuit, in order to detect the time precision that PMU device acquired signal changes.

Exporting mutual actuation time of adjustable relay tip output circuit, is in each relay front, and a delay circuit is set, and the relay back engages lock output or tripping operation output.

The beneficial effect of the utility model device is: portable PMU dynamic characteristics measuring instrument provides field performance test environment and technological means for the PMU device of generating plant and transformer station.Unit and line voltage distribution/electric current with on-the-spot reality or simulation, field voltage/electric current, switch position signal, this tester of input such as alternator shaft key phase pulse signal and tested PMU device, this tester is with per second 10000Hz sample rate, the various parameter amounts of high speed acquisition input, and calculate target synchronized phasor when having high precision, and can produce phase-locked and simulation unit key phase pulse signal that mutual phasor adjustable angle is put in order with set end voltage, do not have all can detect the measuring power angle performance of PMU device under the key phase pulse input condition when possessing pulse input of key phase or unit maintenance in the time of can satisfying on-the-spot unit operation.The phasor data of this tester and tested PMU device recording are communicated by letter by express network is sent to supporting " wide area phasor measurement main website/concentrator/test of PMU communication simulation and analysis software ", calculates the dynamic property and the measuring accuracy of tested PMU device.The utility model device solves the field performance of wide area synchronous phasor measuring device detect and error is checked problem, bring into play good action on-the-spot detection of 16 30 PMU in station of factories of East China Power Grid in debugging first.

Description of drawings

Accompanying drawing 1 the utility model circuit composition frame chart.

Accompanying drawing 2 analog pulse generation circuit/pulse input and output commutation circuit block diagram.

Accompanying drawing 3 switching value input/output interface block diagrams.

Accompanying drawing 4 is signal processor block schemes.

Embodiment

Please refer to accompanying drawing below describes in further detail the utility model.Among the embodiment shown in Fig. 1,2,3,4, one gps clock signal 4 is connected with digital signal processing unit 4, one high-speed sampling analog input unit 1, gather phase current, the phase voltage of external electrical network, one the road delivers to alternator shaft key phase pulse generation unit 2, one the road delivers to digital signal processing unit 3, other is provided with switching value input block 5 and is connected with digital signal processing unit 3, digital signal processing unit 3, be provided with CPU, A/D analog to digital converter and storer, with the digital signal after handling, deliver to network communication interface 7;

Alternator shaft key phase pulse generation unit 2, be that generator machine end three-phase voltage, current signal are imported in the outside, through filtering circuit 8 and waveform shaping circuit 9, be transformed to simulation unit rotating shaft key phase pulse signal with the set end voltage same frequency, behind photoelectric isolating circuit 10, adopt change-over switch 11, again after photoelectricity isolates 12, selection is used for internal pulses and measures 13 by external generator rotating shaft key phase pulse input or by the output of internal simulation alternator shaft key signal;

Exporting mutual actuation time of adjustable relay tip output circuit, is in each relay 15 front, and a delay circuit 14 is set, and relay 15 back engage lock output or tripping operation output 16.

Unit and line voltage distribution/electric current with on-the-spot reality or simulation, field voltage/electric current, switch position signal, this tester of input such as alternator shaft key phase pulse signal and tested PMU device, this tester is with per second 10000Hz sample rate, the various parameter amounts of high speed acquisition input, and calculate target synchronized phasor when having high precision, and can produce phase-locked and simulation unit key phase pulse signal that mutual phasor adjustable angle is put in order with set end voltage, do not have all can detect the measuring power angle performance of PMU device under the key phase pulse input condition when possessing pulse input of key phase or unit maintenance in the time of can satisfying on-the-spot unit operation.The phasor data of this tester and tested PMU device recording are communicated by letter by express network is sent to supporting " wide area phasor measurement main website/concentrator/test of PMU communication simulation and analysis software ", calculates the dynamic property and the measuring accuracy of tested PMU device.The utility model device solves the field performance of wide area synchronous phasor measuring device detect and error is checked problem, bring into play good action on-the-spot detection of 16 30 PMU in station of factories of East China Power Grid in debugging first.

Claims

1. portable PMU dynamic characteristics measuring instrument, it is characterized in that: a gps clock signal is connected with digital signal processing unit, one high-speed sampling analog input unit, gather phase current, the phase voltage of external electrical network, one the road delivers to alternator shaft key phase pulse generation unit, and one the road delivers to digital signal processing unit, and other is provided with the switching value input block and is connected with digital signal processing unit, signal after digital signal processing unit will be handled is delivered to network communication interface.

2. by the described portable PMU dynamic characteristics measuring instrument of claim 1, it is characterized in that: alternator shaft key phase pulse generation unit, be that generator machine end three-phase voltage, current signal are imported in the outside, through wave shaping, be transformed to simulation unit rotating shaft key phase pulse signal with the set end voltage same frequency, after the photoelectricity isolation, adopt change-over switch to select to export by external generator rotating shaft key phase pulse input or by internal simulation alternator shaft key signal.

3. by the described portable PMU dynamic characteristics measuring instrument of claim 1, it is characterized in that: described switch input block is to adopt the high pressure light-coupled isolation to gather the displacement signal of switch, exports mutual actuation time of adjustable relay tip output circuit.

4. by the described portable PMU dynamic characteristics measuring instrument of claim 1, it is characterized in that: export mutual actuation time of adjustable relay tip output circuit, be in each relay front, a delay circuit is set, the relay back engages lock output or tripping operation output.