CN201323458Y

CN201323458Y - Automatic synchronization device of alternating-current synchronous generator

Info

Publication number: CN201323458Y
Application number: CNU2008201997188U
Authority: CN
Inventors: 李正明; 张秋才
Original assignee: Jiangxi Rare Earth and Rare Metals Tungsten Group Holding Co Ltd
Current assignee: Jiangxi Rare Earth and Rare Metals Tungsten Group Holding Co Ltd
Priority date: 2008-12-26
Filing date: 2008-12-26
Publication date: 2009-10-07
Anticipated expiration: 2018-12-26

Abstract

The utility model discloses an automatic synchronization device of alternating-current synchronous generator, comprising a programmable controller PLC, an analogue/digital conversion module, a first and a second voltage transmitters, a first and a second frequency transmitters, and a phase difference transmitter. Five output terminals of the programmable controller PLC are respectively connected with a speed regulation return circuit, an exciting return circuit, and a closing return circuit of a generator, and an extended port of the programmable controller PLC is connected with the analogue/digital conversion module. Input terminals of the first voltage transmitter and the first frequency transmitter are both connected with a power grid, input terminals of the second voltage transmitter and the second frequency transmitter are both connected with a generator network, and output terminals of the second voltage transmitter and the second frequency transmitter are both connected with an input terminal of the analogue/digital conversion module. An input terminal of the phase difference transmitter is connected with the power grid and the generator network, and an output terminal of the phase difference transmitter is connected with the input terminal of the analogue/digital conversion module. The automatic synchronization device of alternating-current synchronous generator is characterized by simple structure, low cost, easy maintenance and reliable interconnection, and is widely adaptable to parallel running of alternating-current synchronous generators and electrical netting power and of alternating-current synchronous generator sets.

Description

Automatic quasi-synchronizing paralleling set of AC synchronous generator

Technical field

The utility model relates to a kind of synchronous alternating-current generator and electrical network grid-connecting apparatus, relates in particular to a kind of automatic quasi-synchronizing paralleling set of AC synchronous generator.

Background technology

When synchronous alternating-current generator and electrical network are incorporated into the power networks, require voltage, phase sequence, frequency and the phase place of generator all should be identical with electrical network, the moment of being incorporated into the power networks so just can not produce generator impacts.When installing wiring, phase sequence just can adjust, therefore accurate simultaneous interconnecting major control two line voltages, frequency, phase place phase.In the practical application, voltage, frequency allow voltage difference, difference on the frequency within the specific limits only as the qualifications same period, guarantee that phase difference is zero.The accurate simultaneous interconnecting device of present large and medium-sized alternating current generator mainly contains two kinds, and a kind of is to adopt lock-on relay, the same period to show to put into practice the same period, and this mode reaction speed is slow, error is big, and the generator connecting in parallel with system process time is long and impact bigger.Another kind of semi-synchronizing device is to adopt integrated circuit or single-chip microcomputer practice synchronously, this mode complex structure, and maintenance difficult, reliability is lower.

Summary of the invention

The utility model purpose is: overcome the above-mentioned defective of prior art, provide a kind of simple in structure, easy to maintenance, reliable automatic sub-synchronous device is incorporated into the power networks.

Technical solutions of the utility model are as follows: be made up of programmable controller PLC, analog-to-digital conversion module, first, second voltage transmitter, first, second frequency transmitter and phase difference transmitter.Five outputs of programmable controller PLC link to each other with generator speed governing, excitation, closing circuit respectively, and the Extended Capabilities Port of programmable controller PLC links to each other with analog-to-digital conversion module; First voltage transmitter, first frequency transmitter input all link to each other with electrical network, and output links to each other with the analog-to-digital conversion module input; Second voltage transmitter, second frequency transmitter input link to each other with the generator net, and output links to each other with the analog-to-digital conversion module input; Phase difference transmitter input links to each other with electrical network, generator net, and output links to each other with the analog-to-digital conversion module input.

The utility model utilizes voltage transmitter, frequency transmitter detection of grid and generator voltage, frequency; Utilize phase difference transmitter detection of grid, generator two power phases poor.Programmable controller PLC carries out the computing comparison process to voltage, frequency, phase difference, and control generator excitation, rotating speed make voltage, frequency, phase difference reach accurate simultaneous interconnecting requirement, realize accurate simultaneous interconnecting.The utility model is simple in structure, with low cost, easy to maintenance, be incorporated into the power networks reliable, can be widely used between synchronous alternating-current generator and the electric network source and the synchronous alternating-current generator group between paired running.

Description of drawings

Fig. 1 is the utility model theory diagram;

Fig. 2 is the utility model embodiment electrical schematic diagram.

Embodiment

Below in conjunction with accompanying drawing the utility model is elaborated.

The utility model is made up of programmable controller PLC 5, analog-to-digital conversion module 6, first,

second voltage transmitter

1,2, first,

second frequency transmitter

3,4 and

phase difference transmitter

7,5 five outputs of programmable controller PLC link to each other with generator speed governing, excitation, closing circuit respectively, and the Extended Capabilities Port of programmable controller PLC 5 links to each other with analog-to-digital conversion module 6; First voltage transmitter 1, first frequency transmitter 3 inputs all link to each other with electrical network, and output links to each other with analog-to-digital conversion module 6 inputs; Second voltage transmitter 2, second frequency transmitter 4 inputs link to each other with the generator net, and output links to each other with analog-to-digital conversion module 6 inputs; Phase difference transmitter 7 inputs link to each other with electrical network, generator net, and output links to each other with analog-to-digital conversion module 6 inputs.

Operation principle of the present utility model is:

First voltage transmitter 1 is gathered mains voltage signal, second voltage transmitter 2 is gathered the generator voltage signal, first frequency transmitter 3 is gathered the line voltage frequency signal, second frequency transmitter 4 is gathered the generator voltage frequency signal, phase difference transmitter 7 is gathered electrical network, generator two supply voltage phase signals, all convert digital signal to, send into programmable controller PLC 5 by analog-to-digital conversion mould AD6.Programmable controller PLC realizes following control:

1, regulation voltage, frequency

A, PLC carry out computing to voltage signal, when line voltage is higher than generator voltage, send the excitation plus signal, increase generator excitation; When the electrical network electricity is lower than generator voltage, send the excitation cut signal, reduce generator excitation.Automatically it is closely zero to be adjusted to two line voltage differentials.

B, PLC carry out computing to frequency signal, when line voltage frequency during greater than the generator voltage frequency, send the rotating speed signal for faster, improve generator speed; When line voltage frequency during less than the generator voltage frequency, send the rotating speed reduce-speed sign, reduce generator speed.Automatically it is closely zero to be adjusted to two mains frequency differentials.

Two kinds of difference range can be as requested by program setting.

2, close a floodgate

When voltage difference, difference on the frequency approaching zero, satisfy when requiring the accurate same period, begin to check phase place, promptly catch the null moment of phase difference, and according to breaker closing loop operate time and two electrical network angular frequency rate variances calculating desirable lead angle, when two electrical network phase differences were consistent with desirable lead angle, PLC sent switching signal, and breaker closing is incorporated into the power networks.The circuit breaker auxiliary magnet turns back to the PLC input, and semi-synchronizing device resets.

Embodiment 1:

Referring to Fig. 2, programmable controller PLC 5 selects for use FX2N-32MR, analog-to-digital conversion module AD 6 to select FX2N-8AD for use in the present embodiment, first,

second voltage transmitter

1,2 is all selected CE-VJ03A for use, and first,

second frequency transmitter

3,4 all selects for use CE-F03, phase difference transmitter 7 to select SINEAXG537 for use.Programmable controller, voltage transmitter, frequency transmitter, phase difference transmitter all adopt the alternating current 220V power supply, and analog-to-digital conversion module utilizes programmable controller+24V power supply power supply.The

input pin

1,2 of first voltage transmitter 1, first frequency transmitter 3 get access to grid respectively A, B phase, the

input pin

1,2 of second voltage transmitter 2, second frequency transmitter 4 is sending and receiving motor net A, B phase respectively.First voltage transmitter, 1 output pin 8,9 connects COM4, the V4+ end pin of analog-to-digital conversion module AD 6 respectively, second voltage transmitter, 2 output pin 8,9 connect COM1, the V1+ end pin of analog-to-digital conversion module AD 6 respectively, first frequency transmitter 3 output pin 8,9 connect COM3, the V3+ end pin of analog-to-digital conversion module AD 6 respectively, and second frequency transmitter 4 output pin 8,9 connect COM2, the V2+ end pin of analog-to-digital conversion module AD 6 respectively.The Y1 of programmable controller PLC 5, Y3, Y5, Y7, Y11, Y14, Y17 and 220V alternating current N end span are connected to relay J C1, JC2, JC3, JC4, indicator light HD1, HD2, the COM1 of programmable controller PLC 5 outputs, COM2, COM3, COM4 holds the fuse RD2 that all connects successively, connect 220V alternating current L end behind the RD1, the COM1 of programmable controller PLC 5 inputs links to each other with the earth terminal pin of analog-to-digital conversion module AD 6, the 24V power end of programmable controller PLC 5 links to each other the X1 of programmable controller PLC 5 with analog-to-digital conversion module AD 6 pin 24+, the push-button switch QA of difference cross-over connection between X6 and ground, normally-closed contact JC5-1.Get access to grid respectively A phase, B of the

input pin

1,2,3,4 of phase difference transmitter 7 reaches generator A phase, B phase mutually, and phase difference transmitter 7 output pin 10,11 meet COM5, the V5+ of analog-to-digital conversion module AD 6 respectively, and the N of all modules, the L pin is corresponding also connects mutually.

The operation principle of present embodiment is: first voltage transmitter 1, first frequency transmitter 3 are gathered electrical network AB phase voltage, frequency signal, send into analog-to-digital conversion module 6 the 4th, the 3rd passage; Voltage transmitter 2, frequency transmitter 4 are gathered generator AB phase voltage, frequency signal, send into analog-to-digital conversion module 6 the 1st, the 2nd passage; Phase difference transmitter 7 is gathered electrical network, generator two power supply AB phase voltage phase signals, sends into analog-to-digital conversion module 6 the 5th passage.Analog-to-digital conversion module 6 converts voltage, frequency, the phase signal of input to standardized digital signal, and imports programmable controller PLC 5 into, presses the QA button, and PLC carries out computing, comparison to digital signal.

When line voltage is higher than generator voltage, PLC Y1 output, relay J C1 action, the control generator excitation circuit increases excitation; When line voltage is lower than generator voltage, PLC Y3 output, relay J C2 action, the control generator excitation circuit reduces excitation, and is closely zero up to two line voltage differentials, Y14 output, the HD1 lamp is bright, and expression voltage satisfies accurate simultaneous interconnecting requirement, and Y1, Y3 stop output.

When the line voltage frequency is higher than the generator voltage frequency, PLC Y5 output, relay J C3 action improves generator speed; When the line voltage frequency is lower than the generator voltage frequency, PLC Y7 output, relay J C4 action reduces generator speed, and is closely zero up to two mains frequency differentials, Y17 output, the HD2 lamp is bright, and the expression frequency satisfies the accurate requirement same period, and Y5, Y6 stop output.

When voltage, frequency all satisfy when requiring the accurate same period, begin to catch the null moment of phase difference, simultaneously according to breaker closing loop operate time and angular frequency rate variance calculating desirable lead angle, when phase difference is consistent with desirable lead angle, PLC Y11 output, relay J C5 action, the control closing circuit closes a floodgate, relay J C5 normally-closed contact JC5-1 turns back to PLC input X6 simultaneously, and PLC resets, and prepares to close a floodgate next time.

Claims

1, a kind of automatic quasi-synchronizing paralleling set of AC synchronous generator, it is characterized in that: form by programmable controller PLC (5), analog-to-digital conversion module (6), first, second voltage transmitter (1), (2), first, second frequency transmitter (3), (4) and phase difference transmitter (7), (5) five outputs of programmable controller PLC link to each other with generator speed governing, excitation, closing circuit respectively, and the Extended Capabilities Port of programmable controller PLC (5) links to each other with analog-to-digital conversion module (6); First voltage transmitter (1), first frequency transmitter (3) input all link to each other with electrical network, and output links to each other with analog-to-digital conversion module (6) input; Second voltage transmitter (2), second frequency transmitter (4) input link to each other with the generator net, and output links to each other with analog-to-digital conversion module (6) input; Phase difference transmitter (7) input links to each other with electrical network, generator net, and output links to each other with analog-to-digital conversion module (6) input.

2, automatic quasi-synchronizing paralleling set of AC synchronous generator according to claim 1, it is characterized in that: programmable controller PLC selects for use FX2N-32MR, analog-to-digital conversion module AD to select FX2N-8AD for use, first, second voltage transmitter is all selected CE-VJ03A for use, first, second frequency transmitter 3 is all selected CE-FO for use, and the phase difference transmitter is selected SINEAX G537 for use.Programmable controller, voltage transmitter, frequency transmitter, phase difference transmitter all adopt the alternating current 220V power supply, and analog-to-digital conversion module utilizes programmable controller+24V power supply power supply.

3, automatic quasi-synchronizing paralleling set of AC synchronous generator according to claim 2, it is characterized in that: the input pin (1,2) of first voltage transmitter (1), first frequency transmitter (3) get access to grid respectively A, B phase, the input pin (1,2) of second voltage transmitter (2), second frequency transmitter (4) is sending and receiving motor net A, B phase respectively; First voltage transmitter (1) output pin (8,9) connects (COM4, V4+) end pin of analog-to-digital conversion module AD (6) respectively, second voltage transmitter (2) output pin (8,9) connects (COM1, V1+) end pin of analog-to-digital conversion module AD (6) respectively, first frequency transmitter (3) output pin (8,9) connects (COM3, V3+) end pin of analog-to-digital conversion module AD (6) respectively, and second frequency transmitter (4) output pin (8,9) connects (COM2, V2+) end pin of analog-to-digital conversion module AD (6) respectively.(the Y1 of programmable controller PLC (5), Y3, Y5, Y7, Y11, Y14, Y17) be connected to relay (JC1 with 220V alternating current N end span, JC2, JC3, JC4), indicator light (HD1, HD2), (the COM1 of programmable controller PLC (5) output, COM2, COM3, COM4) hold the fuse (RD2 that all connects successively, RD1) connect 220V alternating current L end after, the COM1 of the input of programmable controller PLC (5) links to each other with the earth terminal pin of analog-to-digital conversion module AD (6), the 24V power end of programmable controller PLC (5) links to each other (X1 of programmable controller PLC (5) with analog-to-digital conversion module AD (6) pin 24+, X6) push-button switch (QA) of cross-over connection respectively and between ground, normally-closed contact (JC5-1); Get access to grid respectively A phase, B of the input pin of phase difference transmitter (7) (1,2,3,4) reaches generator A phase, B phase mutually, phase difference transmitter (7) output pin (10,11) meets (COM5, the V5+) of analog-to-digital conversion module AD (6) respectively, and the corresponding phase of (N, L) pin of all modules also connects.