CN103615322B - TRT unit overspeed control system and hypervelocity controlling method thereof - Google Patents
TRT unit overspeed control system and hypervelocity controlling method thereof Download PDFInfo
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- CN103615322B CN103615322B CN201310586963.XA CN201310586963A CN103615322B CN 103615322 B CN103615322 B CN 103615322B CN 201310586963 A CN201310586963 A CN 201310586963A CN 103615322 B CN103615322 B CN 103615322B
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Abstract
The invention discloses a kind of TRT unit overspeed control system, generator load three-phase current signal comparing unit receives generator load three-phase current signal, by generator load three-phase current signal with compare setting value and compare, comparative result sends into removal of load logic judgment unit as generator outlet current signal; Network interconnecting circuit position signal input unit for receiving generator network interconnecting circuit position signal, and is sent to removal of load logic judgment unit; Removal of load logic judgment unit is used for comparing generator network interconnecting circuit position signal and described generator outlet current signal, when meeting operation condition to described turbine engine control system sending action signal; Turbine engine control system triggers turbine engine emergency overspeed governor oil circuit after being used for receiving described actuating signal, drives described turbine engine to cut valve events soon; Turbine engine cuts valve soon for cutting off turbine engine coal gas source.The invention also discloses a kind of TRT unit hypervelocity controlling method.
Description
Technical field
The present invention relates to a kind of Gas Turbine Control Technique, specifically, relate to a kind of TRT unit overspeed control system and hypervelocity controlling method thereof.
Background technique
Blast Furnace Gas Turbine top pressure power generation system (be called for short TRT) is the pressure energy that utilizes blast furnace gas to produce and the heat energy a kind of energy recycle device by turbine engine expansion work driving electrical power generators.Generator runs through network interconnecting circuit and higher level electric substation 10.5KV system grid connection, and when TRT runs, generator is to electrical network transmission of electric energy.
At present, there are the following problems for TRT system:
TRT turbine power generation unit is generally grid-connected to be connected with industrial electrical network through electric substation on 10.5KV system busbar, and 10.5KV net system smelter power becomes net, and rate of fault is higher, and jumping electric fault is frequent.After electricity jumped by TRT turbine power generation machine set system side high pressure contact cabinet, there is load rejection speed in unit, and when security system machinery flyball reaches critical working value, turbine engine coal gas source is just cut valve soon and cut off.After turbine engine gas cutting, its inertia energy has not still discharged completely, and continuation is risen, until energy ezpenditure falls by rotating speed.The problems such as unit can cause vibration after exceeding the speed limit, rotor blade fatigue comes off, the rising of generator outlet voltage.Turbine power generation unit once caused unit hypervelocity stopping accident because applied to power supply substation repeatedly occurs that system side high pressure is recalled in a short time; caused operation rotor leaf abscission simultaneously; cause turbine main frame, generator, exciter badly damaged, the millions of unit of direct economic loss.
Summary of the invention
Technical problem solved by the invention is to provide a kind of TRT unit overspeed control system, effectively can improve the unit generated energy of TRT unit, extends the TRT unit operation cycle.
Technological scheme is as follows:
A kind of TRT unit overspeed control system, comprises generator load three-phase current signal comparing unit, network interconnecting circuit position signal input unit, removal of load logic judgment unit, turbine engine control system and turbine engine and cuts valve soon, wherein
Generator load three-phase current signal comparing unit, receive generator load three-phase current signal, for by described generator load three-phase current signal with compare setting value and compare, comparative result sends into described removal of load logic judgment unit as generator outlet current signal;
Network interconnecting circuit position signal input unit, for receiving generator network interconnecting circuit position signal, and is sent to removal of load logic judgment unit by described generator network interconnecting circuit position signal;
Removal of load logic judgment unit, for more described generator network interconnecting circuit position signal and described generator outlet current signal, when described generator network interconnecting circuit position signal and generator outlet current signal all meet operation condition to described turbine engine control system sending action signal;
Turbine engine control system, triggers turbine engine emergency overspeed governor oil circuit, drives described turbine engine to cut valve events soon after receiving described actuating signal;
Turbine engine cuts valve soon, for cutting off turbine engine coal gas source, the hypervelocity runaway accident of the turbine engine preventing generator set removal of load fault to cause.
Further: described generator load three-phase current signal comparing unit comprises dynamo current and compares setup unit, A phase current input unit, B phase current input unit, C phase current input unit, A phase current comparator, B phase current comparator, C phase current comparator, current signal logic judgment unit and current signal and compare output unit; Wherein
Dynamo current compares setup unit, compares setting value for depositing;
A phase current input unit, B phase current input unit, C phase current input unit are used for introducing generator load three-phase current signal respectively, A phase current is sent to described A phase current comparator by described A phase current input unit, B phase current is sent to described B phase current comparator by B phase current input unit, and C phase current is sent to described C phase current comparator by C phase current input unit;
A phase current comparator, B phase current comparator and C phase current comparator are used for A phase current, B phase current, C phase current being compared with the described setting value that compares respectively respectively, and comparative result is sent to described current signal logic judgment unit;
Current signal logic judgment unit, for judging each phase load levels of current of generator whether in normal range (NR), and comparative result is compared output unit as described generator outlet current signal by described current signal be sent to described removal of load logic judgment unit.
Further: the described setting value that compares sets by the rated current of generator 5 ~ 10%.
Further: when described A phase current, B phase current and C phase current be greater than respectively described compare setting value time, judge that each phase load levels of current of generator is in normal range (NR), show that network interconnecting circuit closes, it is 1 that described current signal compares the independent logic word of output unit, illustrates that generator normally runs; If it is that 0 explanation dynamo current disappears that described current signal compares output unit output signal, judge to have occurred removal of load.
Further: the structure of described removal of load logic judgment unit comprises removal of load and judges comparator and logic output unit, wherein
Removal of load judges comparator, compares for described generator network interconnecting circuit position signal and generator outlet current signal are carried out logic again, and the actuating signal relatively sends into logic output unit;
Logic output unit, for described actuating signal is generated control signal, and described control signal is sent into described turbine engine control system, trigger turbine engine emergency overspeed governor oil circuit after described turbine engine control system receives control signal, drive described turbine engine to cut valve events soon.
Another technical problem solved by the invention is to provide a kind of TRT unit hypervelocity controlling method, effectively can improve the unit generated energy of TRT unit, extend the TRT unit operation cycle.
Technological scheme is as follows:
A kind of TRT unit hypervelocity controlling method, comprising:
Generator load three-phase current signal comparing unit receives generator load three-phase current signal, for by described generator load three-phase current signal with compare setting value and compare, comparative result sends into described removal of load logic judgment unit as generator outlet current signal;
Network interconnecting circuit position signal input unit receives generator network interconnecting circuit position signal, and described generator network interconnecting circuit position signal is sent to removal of load logic judgment unit;
Removal of load logic judgment unit more described generator network interconnecting circuit position signal and described generator outlet current signal, when described generator network interconnecting circuit position signal and generator outlet current signal all meet operation condition to described turbine engine control system sending action signal;
Turbine engine control system triggers turbine engine emergency overspeed governor oil circuit after receiving described actuating signal, drive described turbine engine to cut valve events soon;
Turbine engine is cut valve soon and is cut off turbine engine coal gas source, the hypervelocity runaway accident of the turbine engine preventing generator set removal of load fault to cause.
Further: dynamo current compares setup unit and deposits and compare setting value, A phase current input unit, B phase current input unit, C phase current input unit introduce generator load three-phase current signal, A phase current is sent to described A phase current comparator by described A phase current input unit, B phase current is sent to described B phase current comparator by B phase current input unit, and C phase current is sent to described C phase current comparator by C phase current input unit;
A phase current, B phase current, C phase current compare with the described setting value that compares by A phase current comparator, B phase current comparator and C phase current comparator respectively respectively, and comparative result is sent to described current signal logic judgment unit;
Current signal logic judgment unit judges each phase load levels of current of generator whether in normal range (NR), and judged result is compared output unit as described generator outlet current signal by described current signal is sent to described removal of load logic judgment unit.
Further: the described setting value that compares sets by the rated current of generator 5 ~ 10%.
Further: when described A phase current, B phase current and C phase current be greater than respectively described compare setting value time, judge that each phase load levels of current of generator is in normal range (NR), show that network interconnecting circuit closes, it is 1 that described current signal compares the independent logic word of output unit, illustrates that generator normally runs; If it is that 0 explanation dynamo current disappears that described current signal compares output unit output signal, judge to have occurred removal of load.
Further: removal of load judges that described generator network interconnecting circuit position signal and generator outlet current signal are carried out logic and compare by comparator again, the actuating signal relatively sends into logic output unit; Described actuating signal is generated control signal by logic output unit, and described control signal is sent into described turbine engine control system, trigger turbine engine emergency overspeed governor oil circuit after described turbine engine control system receives control signal, drive described turbine engine to cut valve events soon.
Compared with prior art, the technology of the present invention effect comprises:
The present invention effectively avoids the generation of the hypervelocity runaway accident of TRT unit turbine engine, avoids the major accident causing fatal crass, and only cost of equipment one just can create economic benefit more than 200 ten thousand yuan.
The present invention, in TRT unit operation, solves the generator hypervelocity because power supply system fault causes, effectively can improve the unit generated energy of TRT unit, extend the TRT unit operation cycle.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of TRT unit overspeed control system in the present invention.
Embodiment
Generator network interconnecting circuit position signal and generator outlet current signal is introduced in TRT gen-set control system, when generator network interconnecting circuit position signal and generator outlet current signal all meet operation condition, trigger turbine engine emergency overspeed governor oil circuit by turbine engine control system (DCS) to control, drive turbine engine to cut valve events soon to cut soon, just cut off turbine engine coal gas source at the turbine engine hypervelocity initial stage, avoid the appearance of the hypervelocity driving phenomenon of turbine engine.
In the present invention; utilize the Relay Protection Unit of generator to judge whether failure exception disconnects the generator network interconnecting circuit of higher level electric substation; can realize carrying out judgement to higher level electric substation high-voltage trip to detect, introduce TRT unit overspeed control system by generator network interconnecting circuit state.Meanwhile, by generator outlet current signal, when normally being run by generator, load current state also introduces TRT unit overspeed control system by current sensing means.
When network interconnecting circuit state (control word 52A=1) detected and each phase load levels of current (50LP) of generator in normal range (NR), then show breaker closing, unit operation is normal.The definite value of set action value (50LP) can by the rated current of generator 5 ~ 10% (avoid CT and detect dead band) setting.Relay Protection Unit exports in the heavy Fault Control program of access turbine engine control system (DCS), the heavy fault triggering condition when generator network interconnecting circuit in order to realize higher level's applied to power supply substation occurs that removal of load disconnects.
If generator network interconnecting circuit disconnects; generator network interconnecting circuit position signal sends into logic control relay (control word 52A=0); when each phase load electric current of generator being detected lower than set action value (50LP); TRT unit is in the state of being incorporated into the power networks; so protective relay discharge state is true; can judge that electric substation's high pressure is recalled; the removal of load of generator set emerged in operation; Relay Protection Unit triggers DCS; and then drive turbine engine to cut valve soon and cut soon, break off turbine engine coal gas source in time.
Before not adopting improvement controlling method; when system side high pressure recalls rear unit generation removal of load; when only having rotating speed to rise to jumping car value (action of crisis protector); turbine engine is cut valve soon and just can be cut soon; after adding improvement of the present invention control, can send heavy trouble signal immediately by protective gear when load rejection, turbine engine is cut valve soon and is cut soon; unit rapid inertial is shut down, and avoids the appearance of unit driving.
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment 1
As shown in Figure 1, be the circuit diagram of TRT unit overspeed control system in the present invention.
TRT unit overspeed control system comprises: valve 50 cut soon by generator load three-phase current signal comparing unit 10, network interconnecting circuit position signal input unit 20, removal of load logic judgment unit 30, turbine engine control system 40, turbine engine.
Generator load three-phase current signal comparing unit 10, receive the generator load three-phase current signal that the CT (current detecting original paper) in the wire-outgoing breaker of generator provides, for by generator load three-phase current signal with compare setting value and compare, one of basis for estimation whether compare result signal normally runs as generator sends into removal of load logic judgment unit 30.
Generator load three-phase current signal comparing unit 10 comprises: dynamo current compares setup unit 101, A phase current input unit 102, B phase current input unit 103, C phase current input unit 104, A phase current comparator 105, B phase current comparator 106, C phase current comparator 107, current signal logic judgment unit 108, current signal compare output unit 109.
Dynamo current compares setup unit 101 and compares setting value for depositing, and comparing setting value can set by the rated current of generator 5 ~ 10% (avoid CT and detect dead band), prevents sample of signal mistake and causes unit misoperation.
The generator load three-phase current signal that A phase current input unit 102, B phase current input unit 103, C phase current input unit 104 provide for the CT introduced in generator outlet circuit breaker, A phase current signal is sent to A phase current comparator 105 by A phase current input unit 102, B phase current signal is sent to B phase current comparator 106, C phase current input unit 104 and C phase current signal is sent to C phase current comparator 107 by B phase current input unit 103.
A phase current comparator 105, B phase current comparator 106, C phase current comparator 107 by A phase current, B phase current, C phase current respectively with compare setting value and compare, comparative result is sent to current signal logic judgment unit 108.
Comparative result for judging each phase load levels of current of generator whether in normal range (NR), and is compared output unit 109 as generator outlet current signal by current signal and is sent to removal of load logic judgment unit 30 by current signal logic judgment unit 108.When A phase current, B phase current, C phase current be greater than respectively compare setting value time, judge that each phase load levels of current of generator is in normal range (NR), show breaker closing, unit operation is normal, it is 1 that current signal logic judgment unit 108 exports, namely current signal compares the independent logic word of output unit 109 is 1 (50L=1), illustrates that generator normally runs; Export as signal is that 0 explanation dynamo current disappears if current signal compares output unit 109, removal of load may have been occurred.
Generator network interconnecting circuit position signal for receiving generator network interconnecting circuit position signal, and is sent to removal of load logic judgment unit 30 by network interconnecting circuit position signal input unit 20.The network interconnecting circuit position signal of generator is introduced by network interconnecting circuit position signal input unit 20, if position is being opened in the position of the generator network interconnecting circuit of system high pressure contact cabinet, network interconnecting circuit position signal input unit 20 sends 0 signal, otherwise is 1 signal.
The structure of removal of load logic judgment unit 30 comprises: removal of load judges comparator 301, logic output unit 302.Removal of load logic judgment unit 30 is for comparing generator network interconnecting circuit position signal and generator outlet current signal, when generator network interconnecting circuit position signal and generator outlet current signal all meet operation condition, transmit control signal to turbine engine control system 40.
Removal of load judges that generator network interconnecting circuit position signal and generator outlet current signal are carried out logic and compare by comparator 301 again, and the actuating signal relatively sends into logic output unit 302.When the position signal of generator network interconnecting circuit is for open, network interconnecting circuit position signal input unit 20 obtains signal 0, the network interconnecting circuit position signal of generator compares three current signals that output unit 109 sends into and compares with current signal, if when the output that current signal compares output unit 109 is also 0, control signal relatively judges in comparator 301 to be 1 after negate in removal of load, judges that emergency load dump phenomenon has appearred in generator set.
Control signal for actuating signal is generated control signal, and is sent into turbine engine control system 40 by logic output unit 302.
Turbine engine control system 40 triggers turbine engine emergency overspeed governor oil circuit after receiving control signal, drive turbine engine to cut valve 50 action soon.
Turbine engine cuts valve 50 soon for cutting off turbine engine coal gas source, prevents the load rejection speed of generator.Owing to just cutting off turbine engine coal gas source at the turbine engine hypervelocity initial stage, avoid the appearance of the hypervelocity driving phenomenon of turbine engine.
When causing TRT generator set generation removal of load fault after the tripping operation of transmission system side generator network interconnecting circuit; improve control logic can when load rejection the initial stage send Detection Information; turbine engine control system 40 sends heavy trouble signal immediately; drive turbine engine to cut valve 50 soon to cut soon; cut off turbine engine coal gas source; unit rapid inertial is shut down, and effectively avoids the generation of the hypervelocity runaway accident of turbine engine.
Claims (10)
1. a TRT unit overspeed control system, is characterized in that: comprise generator load three-phase current signal comparing unit, network interconnecting circuit position signal input unit, removal of load logic judgment unit, turbine engine control system and turbine engine and cut valve soon, wherein
Generator load three-phase current signal comparing unit, receive generator load three-phase current signal, for by described generator load three-phase current signal with compare setting value and compare, comparative result sends into described removal of load logic judgment unit as generator outlet current signal;
Network interconnecting circuit position signal input unit, for receiving generator network interconnecting circuit position signal, and is sent to removal of load logic judgment unit by described generator network interconnecting circuit position signal;
Removal of load logic judgment unit, for more described generator network interconnecting circuit position signal and described generator outlet current signal, when described generator network interconnecting circuit position signal and generator outlet current signal all meet operation condition to described turbine engine control system sending action signal;
Turbine engine control system, triggers turbine engine emergency overspeed governor oil circuit, drives described turbine engine to cut valve events soon after receiving described actuating signal;
Turbine engine cuts valve soon, for cutting off turbine engine coal gas source, the hypervelocity runaway accident of the turbine engine preventing generator set removal of load fault to cause.
2. TRT unit overspeed control system as claimed in claim 1, is characterized in that: described generator load three-phase current signal comparing unit comprises dynamo current and compares setup unit, A phase current input unit, B phase current input unit, C phase current input unit, A phase current comparator, B phase current comparator, C phase current comparator, current signal logic judgment unit and current signal and compare output unit; Wherein
Dynamo current compares setup unit, compares setting value for depositing;
A phase current input unit, B phase current input unit, C phase current input unit are used for introducing generator load three-phase current signal respectively, A phase current is sent to described A phase current comparator by described A phase current input unit, B phase current is sent to described B phase current comparator by B phase current input unit, and C phase current is sent to described C phase current comparator by C phase current input unit;
A phase current comparator, B phase current comparator and C phase current comparator are used for A phase current, B phase current, C phase current being compared with the described setting value that compares respectively respectively, and comparative result is sent to described current signal logic judgment unit;
Current signal logic judgment unit, for judging each phase load levels of current of generator whether in normal range (NR), and comparative result is compared output unit as described generator outlet current signal by described current signal be sent to described removal of load logic judgment unit.
3. TRT unit overspeed control system as claimed in claim 2, is characterized in that: the described setting value that compares sets by the rated current of generator 5 ~ 10%.
4. TRT unit overspeed control system as claimed in claim 3, it is characterized in that: when described A phase current, B phase current and C phase current be greater than respectively described compare setting value time, judge that each phase load levels of current of generator is in normal range (NR), show that network interconnecting circuit closes, it is 1 that described current signal compares the independent logic word of output unit, illustrates that generator normally runs; If it is that 0 explanation dynamo current disappears that described current signal compares output unit output signal, judge to have occurred removal of load.
5. TRT unit overspeed control system as claimed in claim 1, is characterized in that: the structure of described removal of load logic judgment unit comprises removal of load and judges comparator and logic output unit, wherein
Removal of load judges comparator, compares for described generator network interconnecting circuit position signal and generator outlet current signal are carried out logic again, and the actuating signal relatively sends into logic output unit;
Logic output unit, for described actuating signal is generated control signal, and described control signal is sent into described turbine engine control system, trigger turbine engine emergency overspeed governor oil circuit after described turbine engine control system receives control signal, drive described turbine engine to cut valve events soon.
6. a TRT unit hypervelocity controlling method, comprising:
Generator load three-phase current signal comparing unit receives generator load three-phase current signal, for by described generator load three-phase current signal with compare setting value and compare, comparative result sends into described removal of load logic judgment unit as generator outlet current signal;
Network interconnecting circuit position signal input unit receives generator network interconnecting circuit position signal, and described generator network interconnecting circuit position signal is sent to removal of load logic judgment unit;
Removal of load logic judgment unit more described generator network interconnecting circuit position signal and described generator outlet current signal, when described generator network interconnecting circuit position signal and generator outlet current signal all meet operation condition to described turbine engine control system sending action signal;
Turbine engine control system triggers turbine engine emergency overspeed governor oil circuit after receiving described actuating signal, drive described turbine engine to cut valve events soon;
Turbine engine is cut valve soon and is cut off turbine engine coal gas source, the hypervelocity runaway accident of the turbine engine preventing generator set removal of load fault to cause.
7. as claimed in claim 6 TRT unit hypervelocity controlling method, it is characterized in that:
Dynamo current compares setup unit and deposits and compare setting value, A phase current input unit, B phase current input unit, C phase current input unit introduce generator load three-phase current signal, A phase current is sent to described A phase current comparator by described A phase current input unit, B phase current is sent to described B phase current comparator by B phase current input unit, and C phase current is sent to described C phase current comparator by C phase current input unit;
A phase current, B phase current, C phase current compare with the described setting value that compares by A phase current comparator, B phase current comparator and C phase current comparator respectively respectively, and comparative result is sent to described current signal logic judgment unit;
Current signal logic judgment unit judges each phase load levels of current of generator whether in normal range (NR), and judged result is compared output unit as described generator outlet current signal by described current signal is sent to described removal of load logic judgment unit.
8. as claimed in claim 7 TRT unit hypervelocity controlling method, it is characterized in that: the described setting value that compares sets by the rated current of generator 5 ~ 10%.
9. as claimed in claim 8 TRT unit hypervelocity controlling method, it is characterized in that: when described A phase current, B phase current and C phase current be greater than respectively described compare setting value time, judge that each phase load levels of current of generator is in normal range (NR), show that network interconnecting circuit closes, it is 1 that described current signal compares the independent logic word of output unit, illustrates that generator normally runs; If it is that 0 explanation dynamo current disappears that described current signal compares output unit output signal, judge to have occurred removal of load.
10. as claimed in claim 6 TRT unit hypervelocity controlling method, it is characterized in that: removal of load judges that described generator network interconnecting circuit position signal and generator outlet current signal are carried out logic and compare by comparator again, the actuating signal relatively sends into logic output unit; Described actuating signal is generated control signal by logic output unit, and described control signal is sent into described turbine engine control system, trigger turbine engine emergency overspeed governor oil circuit after described turbine engine control system receives control signal, drive described turbine engine to cut valve events soon.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104121044B (en) * | 2014-07-24 | 2015-12-30 | 江苏永钢集团有限公司 | The method of controlling security of generator jumped by a kind of turbine emergency protector connection |
| CN104500234A (en) * | 2014-12-26 | 2015-04-08 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Heavy-duty gas turbine over-speed protection method and heavy-duty gas turbine over-speed protection device |
| CN106988894B (en) * | 2017-04-19 | 2019-05-24 | 中国航发沈阳发动机研究所 | A kind of gas turbine removal of load control system |
| CN110344945B (en) * | 2019-07-25 | 2021-10-01 | 中国航发沈阳发动机研究所 | Load shedding control method and system |
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