CN102751735B - Generating set output reducing and generating set tripping device used in case of overload of contact outgoing lines of power plant - Google Patents

Generating set output reducing and generating set tripping device used in case of overload of contact outgoing lines of power plant Download PDF

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Publication number
CN102751735B
CN102751735B CN201110098374.8A CN201110098374A CN102751735B CN 102751735 B CN102751735 B CN 102751735B CN 201110098374 A CN201110098374 A CN 201110098374A CN 102751735 B CN102751735 B CN 102751735B
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owes
contact
mistake
logic
overload
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CN201110098374.8A
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CN102751735A (en
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巨争号
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巨争号
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Abstract

The invention provides a generating set output reducing and generating set tripping device used in the case of overload of contact outgoing lines of a power plant. When the contact outgoing lines of the power plant do not conform to the N-1 criterion of power supply security, in the case that any of the contact outgoing line trips out, firstly, the output of the generating sets engaged in operation is reduced automatically within the time limit allowed by the overload of the contact outgoing lines and then whether to trip the generating sets engaged in operation is determined according to the value of the current delivered by the contact outgoing lines after the output of the generating sets engaged in operation is reduced. The generating set output reducing and generating set tripping device is based on a clear principle and is simple in structure and can flexibly choose to reduce the output of the generating sets or trip out the generating sets. The generating set output reducing and generating set tripping device can be independently used as a high-reliability power grid automatic device.

Description

Contact outlet overload in power plant subtracts unit output and cuts machine
Technical field
The technology of the present invention field belongs to circuit arrangement or the system of electricity power supply or distribution.This invention relates to a kind of power plant contact outlet overload and subtracts unit output and cut machine, it be to generation current factory contact outlet in the time not possessing " N-1 " criterion condition that power supply safety adopts, because arbitrary contact outlet tripping operation causes the one design that operation contact outlet overload scaling loss is done.
Background technology
Before the present invention proposes; do not have at present specially and to subtract unit output for power plant contact outlet overload and cut machine automatics; close, similar prior art is the safety stabilizing devices that is applicable to regional power grid and large-sized connection electrified wire netting with it; its range of application is applicable to the Transient Stability Control of wide area plant stand; device collection capacity is the status signal of circuit, transformer, generator; action consequence is directly to stop circuit to shut down, and specific aim is not strong, and cost is high.Its representative art has: the distributed stability control device of RCS-992 (similar technique), RCS-991 transformer overload Union Switch Device (close technology) etc., their basic comprisings the main body of existing similar similar, close technology.
Summary of the invention
For overcome existing close, similar technique as regional power grid and large-sized connection electrified wire netting safety stabilizing devices in the deficiency aspect range of application, action consequence and specific aim, the invention provides one " contact outlet overload in power plant subtracts unit output and cuts machine ".In the time that contact outlet in power plant does not possess " N-1 " criterion condition that power supply safety adopts, in the time there is any contact outlet tripping operation, easily cause operation contact outlet overload scaling loss.The general principle of this invention is normal and accident timer carries electric current to judge to operation interconnection, first carry electric current to exceed its design when judgement operation interconnection subtracts certain or a few generating sets by predetermined way while carrying electric current and exerts oneself and do not cut easily machine, subtracting the unit output time limit still detects that to getting in touch with overload time limit that outlet allows and contact outlet when overload selects to cut certain or a few units again, can be independently as a kind of electrical network automatics of high reliability.
The technical solution adopted for the present invention to solve the technical problems is: double back outlet overload subtracts unit output and cuts machine logic (Fig. 1) by I i mistake, I iI mistake, I i owes, I iI owesfour mistakes, the amount of owing current element, with 1, with 2two and gate logic element, T 1, T 2two time component compositions.I i mistake, I iI owescomposition with 1logic, with 1export a road and meet time component T 1, another road meets time component T 2.I iI mistake, I i owescomposition with 2logic, with 2export a road and meet time component T 3, another road meets time component T 4.In the time that any tripping operation of double back contact outlet causes an interconnection overload of operation; automatically subtract certain or a few generator outputs to transshipping circuit nonoverload until select to cut machine, with the object that reaches protection transmission line safe operation and do not cut easily machine by presetting scheme (being determined by output clamping).Non-double back contact outlet (3 times and more than) overload subtracts unit output and cuts machine logic (Fig. 2 A, Fig. 2 B) by I i mistake, I iI mistake---I n mistake, I i owes, I iI owes---I n owesmultiple mistakes, the amount of owing current element, or 1, or 2---or nn or gate logic element, with 1, with 2---with nn and gate logic element, T 1, T 2, T 3, T 4, T 2N-1, T 2N2N time component composition.I iI owes, I iII owes,---I n owescomposition or 1logic, I i mistakewith or 1composition with 1logic, with 1export a road and meet time component T 1, another road meets time component T 2.I i owes, I iII owes,---I n owescomposition or 2logic, I iI mistakewith or 2composition with 2logic, with 2export a road and meet time component T 3, another road meets time component T 4.I i owes, I iI owes,---I n owescomposition or 3logic, I iII mistakewith or 3composition with 3logic, with 3export a road and meet time component T 5, another road meets time component T 6.----I i owes, I iI owes,---I n-1 owescomposition or nlogic, I n mistakewith or ncomposition with nlogic, with nexport a road and meet time component T 2N-1, another road meets time component T 2N.When any tripping operation of non-double back contact outlet (3 times and more than); device judges all the other working line electric currents; when not exporting it, operation transmission line nonoverload timer continues operation; automatically subtract certain or a few generator outputs to transshipping circuit nonoverload until select to cut machine, with the object that reaches protection transmission line safe operation and do not cut easily machine by presetting scheme (being determined by output clamping) when one or more when overload that judges working line
Effective effect of the present invention is: principle of device is clear, simple structure, and action logic is reasonable, and outlet subtracts exerts oneself, cuts machine selection flexibly, and owing to selecting the magnitude of current as main criterion, reliability is relatively high.
Brief description of the drawings
Fig. 1 is the present invention " double back contact outlet overload subtracts unit output and cuts machine logic schematic diagram ".
Fig. 2 A, Fig. 2 B are the present invention " non-double back contact outlet (3 times and more than) overload subtracts unit output and cuts machine logic theory "
Fig. 1 logic schematic diagram is by getting in touch with I line overcurrent element I i mistake, undercurrent element I i owes, contact II line overcurrent element I iI mistake, undercurrent element I iI owes, with gate logic element with 1, with 2, time component T 1, T 2, T 3, T 4and associated contact I, contact II line overload subtract meritorious signal pressing plate, cutting machine signal pressing plate, subtracts #1 machine to subtracting the meritorious output clamping of #N machine, cuts #1 machine and jointly forms to cutting #N machine output clamping.
Fig. 2 A, Fig. 2 B logic schematic diagram are by by contact I line, contact II line, contact III line ..., contact N line overcurrent, undercurrent element I i mistake, I iI mistake, I iII mistake, I n mistake, I i owes, I iI owes, I iII owes, I n owes, or gate logic element or 1, or 2, or 3, or n, time component T 1, T 2, T 2Nform Deng common.Its logical relation for when certain interconnection with overcurrent element to corresponding while inputting with door, after other interconnection undercurrent or logic again with this interconnection overcurrent element and logic.
Embodiment
Fig. 1 logic schematic diagram is cut machine logic schematic diagram for double back contact outlet overload in this device subtracts unit output.This logic theory is by getting in touch with I line overcurrent element I i mistake, undercurrent element I i owes, contact II line overcurrent element I iI mistake, undercurrent element I iI owes, with gate logic element with 1, with 2, time component T 1, T 2, T 3, T 4and associated contact I, contact II line overload subtract meritorious signal pressing plate, cutting machine signal pressing plate, subtracts #1 machine to subtracting the meritorious output clamping of #N machine, cuts #1 machine to cutting #N machine output clamping composition.I i mistakewith I iI owescomposition and door 1 logic, with door 1 with 1export a road and meet time component T 1, another road output meets time component T 2.I iI mistakewith I i owescomposition and door 2 logics, with door 2 with 2export a road and meet time component T 3, another road output meets time component T 4.In the time that two interconnections all normally move, I in advance adjusts i mistake, I iI mistake, I i owes, I iI owesfour equal no-outputs of current element, with door 1 with 1, with door 2 with 2without input and output, time component T 1, T 2also without input and output, automatics no-output, gets in touch with outlets for two and normally moves.When certain contact outlet for a certain reason, as the tripping operation of contact I line unsuccessful reclosing (trip reason has line fault to be tripped by the relevant relaying protection of circuit, switch jump etc.), is got in touch with I line I i mistakeno-output, I i oweshave output, power plant sends power and jointly carries to become by circuit of contact II line to electrical network and carry to electrical network, I from connection I, the connection II line got in touch with before the tripping operation of I line iI mistakeaction has output, I iI owesno-output, so far, due to I i mistake, I iI owesall no-outputs, with door 1 also without input and output, T 1, T 2same without input and output, but I at this moment iI mistake, I i owesall action has output, and making has input and output with door 2, is added to respectively time component T with door 2 output signals 3and time elements T 4input, through predetermined time delay T 3sending out connection II line overload subtracts and has function signal, also output simultaneously subtracts meritorious instruction and automatically subtracts generator active power, and along with subtracting the execution of generator active power operation, power plant sends gross power and will progressively reduce, contact II line transmission power declines thereupon, and contact II line current also progressively declines.If with 2export time delay T to 4action has before output, and contact II line current is due to T 3action subtracts generator active power and makes to get in touch with II line current and drop to I iI mistakereturn value and when following, I iI mistakereturn to no-output, with door 2due to I iI mistakeno-output, with door 2without input and output, time component T 3, T 4instantaneous returning, generator subtracts meritorious operation and stops, and after at this moment getting in touch with II line transmission power and subtracting generator active power, generator sets in power plant power output matches.If with 2there is output T 4input to T 4delay time arrives setting time, and contact II line current is due to T 3action subtracts generator active power to make to get in touch with II line current and declines and still do not reach I iI mistakereturn value, I iI mistakestill move, through T 4time delay, T 4connection II line cutting machine signal is sent out in output, and certain or a few generating sets are excised in outputting cutting machine instruction simultaneously, drop to below setting value until get in touch with II line current, now, I iI mistakereturn to no-output, with door 2 due to I iI mistakeno-output, with 2no-output, T 3, T 4because returning without input signal is instantaneous.Setup times elements T 3object be after interconnection (as contact I line) is due to a variety of causes tripping operation, operation interconnection (as contact II line) overload overcurrent element action, circuit automatic reclosing is once after the scheduled time (reclosure time) for tripping operation circuit (as contact I line) automatic reclosing, if successful reclosing, the interconnection of tripping operation can continue to recover normal power supply, operation interconnection (as contact II line) overcurrent element returns thereupon, T 3, T 4can not export and subtract generator output and cut machine operation.If the interconnection of tripping operation (as contact I) unsuccessful reclosing, T 3there is output, the same aforementioned process of course of action.Time component T 3setting value is by escaping interconnection reclosure time and considering differential adjusting of time, time component T 1object with act on roughly the same time component T 3, at this moment corresponding contact II line tripping operation contact I line overload.Setup times elements T 4object is in the time that interconnection (as contact I line) tripping operation makes to move interconnection (as contact II line) overload, overload interconnection generally has the overload operating time of a permission, if its electric current drops to the safety value of adjusting with the next machine of not cutting by subtracting generator output at this moment, otherwise machine operation is cut in outlet action.T 4adjust the time setting that circuit is thermally-stabilised allowed under escaping the circuit primary current overload magnification corresponding with overcurrent element setting value, also must subtract meritorious operation adjustment porthole synchronizer stroke time coordination with generator, its value should be greater than generator synchronizer adjust porthole from generator full power adjust to generator no-load power be to the adjustment time, time component T 2object with act on roughly the same time component T 4, at this moment corresponding contact II line tripping operation contact I line overload.Overcurrent element I i mistake, I iI mistakeadjust and adjust by being greater than circuit maximum load current and being no more than the maximum stable limiting current that circuit allows.Undercurrent element I i owes, I iI owesadjust and adjust by being greater than line charging electric current and being less than the normal minimum load current of circuit.If the interconnection of tripping operation (as contact I) successful reclosing, due to time component T 3setting time is greater than the circuit re-switching time, the interconnection nonoverload of former overload after the interconnection of tripping operation overlaps, and its overcurrent element returns, T 3, T 4time component can not move.
When making for a certain reason to join the tripping operation of II line unsuccessful reclosing (trip reason has line fault to be tripped by the relevant relaying protection of circuit, switch jump etc.), at this moment power plant generator sends power mainly by contact I alignment system power supply, I i mistake, I iI owescurrent element action, I i owes, I iI mistakecurrent element is failure to actuate, with door 1there is input/output signal, with door 2without input/output signal, with door 1after action through time component T 1send out contact I line overload and subtract to have function signal and subtract certain or a few generated powers and exert oneself, at predetermined T 2if subtract the meritorious connection I line overcurrent element I that makes overload in the time i mistakereturn and door 1return to T 1, T 2all instantaneous return not carry out cut machine operation and eventually to subtracting meritorious operation, otherwise through T 2time component is sent out contact I line overload cutting machine signal and is cut certain or a few generators.Its course of action and T 1, T 2time component arranges object, adjusts and gets in touch with the tripping operation of I line, contact II line overload is similar or identical.Subtract which platform or subtract which platform generated power for any interconnection tripping operation, operation interconnection overload, cut which platform or cut which platform generator given in advance by traffic control department and drop into corresponding pressing plate, should determine according to operation generating set concrete condition.If the interconnection of tripping operation (as contact II line) successful reclosing, time component T 1, T 2can not move, reason is with the tripping operation of above contact I line, contact II line overloading analysis.
Fig. 2 A, Fig. 2 B cut machine logic schematic diagram ((this non-double back contact outlet (3 times and more than) overload subtracts unit output and cuts two of machine logic schematic diagram component 2A, Fig. 2 B) for non-double back contact outlet in this device (3 times and more than) overload subtracts unit output).This logic theory is by getting in touch with I line, contact II line, contact III line ..., contact N line overcurrent, undercurrent element I i mistake, I iI mistake, I iII mistake, I n mistake, I i owes, I iI owes, I iII owes, I n owes, or gate logic element or 1, or 2, or 3, or n, time component T 1, T 2, T 2Ndeng composition.Its logical relation for when certain interconnection with overcurrent element to corresponding while inputting with door, after other interconnection undercurrent or logic again with this interconnection overcurrent element and logic.Subtract to gain merit taking contact I line overload and cut machine part as example, contact I line I i mistake, other interconnection I iI owes, I iII owes, I n owesundercurrent element composition or gate logic or 1, I i mistakewith or 1composition with 1, with 1output meets time component T 1and T 2, T 1, T 2output send out subtract unit have function signal and subtract certain or a few units meritorious, send out and cut machine function signal and cut certain or a few generating sets.Other interconnection overload logic composition and similar above, no longer explanation.Modern power plant and system contact outlet are in the majority with double loop, generally be no more than four, this example has three contact outlets and cuts machine logic and describe as example subtracts unit output to its any contact outlet tripping operation taking power plant: in the time that certain contact outlet is as the tripping operation of contact III line for a certain reason (unsuccessful reclosing), and I iII owesaction, or 1and or 2all action has output, if contact I line, the equal nonoverload of contact II line after the tripping operation of contact III line, the device outlet of being failure to actuate.When contact I line, contact II line transship simultaneously, I i mistake, I iI mistakeall action, at this moment or 1, or 2also there is output, with 1, with 2there are input and output signal, with 1output is through time component T 1rear send out contact I line overload subtract have function signal and subtract certain or a few units meritorious, with 1output is through time component T 2rear sending out got in touch with I line overload cutting machine signal and cuts certain or a few generating sets.With 2output starts T 3, T 4, through time component T 3rear send out contact II line overload subtract have function signal and subtract certain or a few units meritorious, through time component T 4rear sending out got in touch with II line overload cutting machine signal and cuts certain or a few generating sets.If contact I line, contact II line only have any interconnection overload after the tripping operation of contact III line, suppose at this moment to get in touch with only I line overload, I i mistakeaction, the tripping operation of contact III line, I iII owesaction, or 1there is output, with door 1there is output, through time component T 1, T 2get in touch with respectively I line overload and subtract meritorious and cut machine operation, concrete course of action is the same, no longer explanation.If II line overload, at this moment I are only got in touch with in the tripping operation of contact III line iII owesaction, or 2action, I iI mistakeaction, with door 2there are input and output, through time component T 3, T 4get in touch with respectively II line overload and subtract meritorious and cut machine operation, in the time that certain contact outlet is as contact III line tripping operation successful reclosing for a certain reason, analyzes and subtract unit output with double back contact outlet overload and cut machine logic theory, due to time component T 1, T 3setting time is greater than the circuit re-switching time, the interconnection nonoverload of former overload after the interconnection of tripping operation overlaps, and its overcurrent element returns, T 1, T 3time component can not move, T 2, T 4time component also can not move.Do not subtract and gain merit and cut machine operation.In the time getting in touch with for a certain reason outlet as the tripping operation of contact II line (unsuccessful reclosing), I iI owesaction, or 1, or 5all action has output, at this moment also exists contact I line, contact III line to transship simultaneously or gets in touch with I line, two kinds of situations of any overload of contact III line, corresponding I i mistake, I iII mistakeor I i mistake, I iII mistakeany one action has output, with door 1, with door 3or with door 1, with door 3any one has input and output, with door 1, with door 3after action, a connection I, connection III line overload subtract meritorious and cut machine operation, in the time getting in touch with outlet as contact II line tripping operation successful reclosing, analyze with joining the tripping operation of III line and analyze, due to time component T 1, T 5setting time is greater than the circuit re-switching time, the interconnection nonoverload of former overload after the interconnection of tripping operation overlaps, and its overcurrent element returns, T 1, T 5time component can not move, T 2, T 6time component also can not move, and does not subtract and gains merit and cut machine operation.In the time getting in touch with for a certain reason outlet as the tripping operation of contact I line (unsuccessful reclosing), I i owesaction, or 2, or 3all action has output, at this moment also exists contact II line, contact III line to transship simultaneously or gets in touch with II line, two kinds of situations of any one overload of contact III line, corresponding I iI mistake, I iII mistakeor I iI mistake, I iII mistakeany one action has output, with door 2, with door 3or with door 2, with door 3any one has input and output, with door 2, with door 3after moving, a contact II, contact III line transship and subtract meritorious and cut machine operation, and in the time getting in touch with outlet as contact I line tripping operation successful reclosing, analysis is with getting in touch with II, contact III line tripping operation analysis, due to time component T 3, T 5setting time is greater than the circuit re-switching time, the interconnection nonoverload of former overload after the interconnection of tripping operation overlaps, and its overcurrent element returns, T 3, T 5time component can not move, T 4, T 6time component also can not move, and does not subtract and gains merit and cut machine operation.For power plant, outlet is greater than three during if any N bar, circuit formation and analytic process to above while thering is three contact outlets situation similar, which bar line tripping, must there is this circuit undercurrent element action, and open except this circuit other transship circuit corresponding or gate logic, tripping operation circuit can cause any bar operation contact outlet overload corresponding this contact outlet overload subtract that unit is meritorious to be cut machine and export and carry out corresponding operating, no longer carry out detail analytic explanation.Subtract unit output and cut overcurrent element in machine logic theory, undercurrent element, time component calculation principle for this routine non-double back contact outlet (3 times and more than) overload, after overload, subtract any platform or which platform unit output, after overload, cut any platform or which platform unit etc. and a part of double back of figure contact outlet overload and subtract unit output to cut machine logic theory part identical, no longer explanation.
If contact outlet in power plant is two, device logic theory subtracts unit output by the double back contact outlet overload of this Figure of description 1 and cuts machine logic and carry out Logical Configuration.Be non-double back contact outlet (3 times and more than) for power plant contact outlet, device logic theory is transshipped and is subtracted unit output and cut machine logic and carry out Logical Configuration by the non-double back contact outlet of this Figure of description 2A, accompanying drawing 2B (3 times and more than).The contact outlet of above-mentioned double back and non-double back contact outlet (3 times and more than) overload subtracts unit output and cuts machine, subtracts meritorious time component and adjust by escaping interconnection reclosure time and considering differential adjusting of time.The machine time component of cutting was adjusted the time that circuit is thermally-stabilised allowed under escaping the circuit primary current overload magnification corresponding with overcurrent element setting value, also must subtract meritorious operation adjustment porthole synchronizer stroke time coordination with generator, its value should be greater than generator synchronizer adjust porthole from generator full power adjust to generator no-load power be to the adjustment time.Overcurrent element is adjusted and is adjusted by being greater than circuit maximum load current and being no more than the maximum stable limiting current that circuit allows.Undercurrent element is adjusted and is adjusted by being greater than line charging electric current and being less than the normal minimum load current of circuit.Every interconnection can be adopted three-phase current simultaneously and carry out logic OR again and complete judgement, but device complexity increases and reliability reduces relatively, considers that overload is generally three-phase symmetrical overload, and suggested design is interconnection overload, the underload monophase current scheme that gathers of getting.For there being a certain contact outlet problem of power plant outlet by-pass switch generation, if device does not gather the by-pass switch magnitude of current Logical Configuration, in the time that by-pass switch moves for certain interconnection, this device must exit, perfect scheme is that by-pass switch is carried out current sample and subtracts the meritorious machine logic of cutting of unit with other interconnection current sample configuration composition interconnection overload, and two described interconnection overloads of principle of device and outlet mode and this explanation subtract unit output and cut machine logic theory roughly the same.
This device formation is simple in structure, principle is clear, can independently become a kind of microcomputer electrical network automatic safety device with strong points.

Claims (1)

1. power plant contact outlet overload subtracts unit output and cuts machine, subtract unit output by double back contact outlet overload and cut machine logic theory, non-double back contact outlet overload subtracts unit output and cuts machine logic theory and jointly form, it is characterized by, double back contact outlet overload subtracts unit output and cuts machine logic theory by I i mistake, I iI mistake, I i owes, I iI owesfour mistakes, the amount of owing current element, with 1, with 2two and gate logic element, T 1, T 2, T 3, T 4four time component compositions, I i mistake, I iI owescomposition with 1logic, with 1export a road connect hours elements T 1, another road connect hours elements T 2, I iI mistake, I i owescomposition with 2logic, with 2export a road connect hours elements T 3, another road connect hours elements T 4, non-double back contact outlet overload subtracts unit output and cuts machine logic theory by I i mistake, I iI mistake, I iII mistake,---I n mistake, I i owes, I iI owes, I iII owes,---I n owesmultiple mistakes, the amount of owing current element, or 1, or 2, or 3,---or nn or gate logic element, with 1, with 2, with 3,---with nn and gate logic element, T 1, T 2, T 3, T 4, T 5, T 6,---T 2N-1, T 2N2N time component composition, I iI owes, I iII owes,---I n owescomposition or 1logic, I i mistakewith or 1composition with 1logic, with 1export a road connect hours elements T 1, another road connect hours elements T 2, I i owes, I iII owes,---I n owescomposition or 2logic, I iI mistakewith or 2composition with 2logic, with 2export a road connect hours elements T 3, another road connect hours elements T 4, I i owes, I iI owes,---I n owescomposition or 3logic, I iII mistakewith or 3composition with 3logic, with 3export a road connect hours elements T 5, another road connect hours elements T 6,---I i owes, I iI owes,---I n-1 owescomposition or nlogic, I n mistakewith or ncomposition with nlogic, with nexport a road connect hours elements T 2N-1, another road connect hours elements T 2N.
CN201110098374.8A 2011-04-19 2011-04-19 Generating set output reducing and generating set tripping device used in case of overload of contact outgoing lines of power plant CN102751735B (en)

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CN105656086B (en) * 2015-11-26 2018-09-14 国家电网公司 Overload processing method
CN109633339A (en) * 2019-01-09 2019-04-16 中国神华能源股份有限公司 Equipment fault detection circuit and method

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