CN101431229A - Asynchronous switch-on protection method for generator set - Google Patents
Asynchronous switch-on protection method for generator set Download PDFInfo
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- CN101431229A CN101431229A CNA2008102389362A CN200810238936A CN101431229A CN 101431229 A CN101431229 A CN 101431229A CN A2008102389362 A CNA2008102389362 A CN A2008102389362A CN 200810238936 A CN200810238936 A CN 200810238936A CN 101431229 A CN101431229 A CN 101431229A
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Abstract
The invention provides a method for adding nonsynchronous closing protection in generating set protection. Aiming at nonsynchronous closing accidents, a method of synchronous identification is first adopted; and an added synchronous relay is adopted, thereby avoiding nonsynchronous closing accidents. If nonsynchronous closing accidents happen to the generating set, a special nonsynchronous closing protection is needed to be arranged so as to lead the generating set to be started aside in time. The protection utilizes the logical relationship of a breaker assistant contact point, low-voltage and over-current to protect the nonsynchronous closing of the generating set. When the logical conditions meet judgment that nonsynchronous closing accidents happen to the generating set, the generating set is started aside within T3 by delaying a nonsynchronous closing protection exit and connected to a breaker of the electric network, breaker failure protection is not required to start, T3 is equal to 0.1 second normally, and the generating set is removed from the system, thereby avoiding further damage to the system and the generating set caused by the nonsynchronous closing.
Description
Technical field
The invention belongs to the relay protection of power system technical field, relate more specifically to a kind of method of generating set relaying protection.
Background technology
In the actual motion of electric power system, often to as required generating set be separated with system, perhaps generating set is connected to the grid.In general, power plant will carry out the vacation test same period before being connected to the grid, just can carry out asynchronous switch-on then and be incorporated into the power networks.But in some cases; because the problem of generating set synchronous device or secondary circuit; when both sides voltage magnitude, phase place, frequency are all very appropriate, just be not connected to the grid; this is called the generating set non-Switching Synchronization and is incorporated into the power networks; may cause the power oscillation of system, bigger to the equipment and the protection influence of power plant.
If rotor has applied exciting voltage, the switching current that non-Switching Synchronization produces even up to 3～8 times of rated current causes very big influence to unit.If combined floodgate moment generating set frequency is approaching or equal system frequency, and circuit breaker both end voltage phase difference is bigger, the moment of then closing a floodgate will produce very big switching current.Switching current maximum in circuit breaker both end voltage just in time anti-phase when being 180 ° (be both end voltage phase angle difference) and when all being peak value; Impact torque maximum when the both end voltage phase angle difference is 120 °.If generating set closes a floodgate when frequency is low, then not only there is bigger difference on the frequency between generating set and system, amplitude also has very big-difference between set end voltage and system voltage, and the possibility that differential seat angle is qualified is also minimum.3 conditions of asynchronous switch-on do not satisfy probably, at least have 2 conditions not satisfy yet, and situation is very abominable, will produce the huge impact electric current in the stator.Because exist than big-difference between rotor speed and synchronous speed, stator current will cause rotor surface local temperature rise at rotor surface induction frequencies spill current.If the heat accumulation overlong time equally also can be damaged rotor.The enormous impact that non-Switching Synchronization produces generating set also will be shortened the useful life of generating set, will directly damage macro-axis when serious.
The non-synchronization paralleling of generating set and electric power system will damage any type of generating set, and the parts of damage may be that change, the stator winding of coupling bolt, position of bearings fluffs, stator lasmination fluffs, axle and other machine parts fatigue damage.Non-synchronization paralleling can cause that also generating set step-up transformer internal force damages, though non-synchronization paralleling all has infringement to big or small unit, the big unit that is connected in Low ESR, EHV system influences more serious because electric current and axial stress are bigger.In addition, non-Switching Synchronization also can not be ignored the impact of system.
Be a through current to transformer, generating set when the non-Switching Synchronization electric current is very big, differential protection should reliably be failure to actuate.But the non-synchronization paralleling of passing through property current generator group and electric power system will damage any type of generating set.So, be necessary very much to install the non-Switching Synchronization protection.
At present, do not have special-purpose generating set non-Switching Synchronization protection basically, generally can only rely on upward electric protection of mistake, overcurrent protection, impedance protection, loss of synchronism protection to wait the serious non-Switching Synchronization accident of excising.False switching taking place when electric protection is at generating set jiggering or stationary rotor on the mistake operate and be provided with, can't move probably in the accident in the serious non-same period; And the overcurrent protection of generating set, impedance protection, loss of synchronism protection action delay are longer, and the situation that protection is returned behind the non-Switching Synchronization may occur, cause protection tripping or deferred action, can cause very macrolesion to unit, and system is also produced enormous impact.And the present invention; solved and protected tripping or deferred action problem in the accident the serious non-same period; and can malfunction in normal operation, normal and net operation, slight can not tripped in the accident the non-same period of unit pull-in step yet, guaranteed unit safety operation.
Summary of the invention
At the non-Switching Synchronization accident, should preferentially adopt the method for identifying the same period, adopt the additional relay same period, the generation of prevention non-Switching Synchronization accident.If but after serious non-Switching Synchronization accident has taken place unit,, need ad hoc non-Switching Synchronization protection for the generating set of tripping in time.The present invention is in order to prevent that non-Switching Synchronization from causing damage to system or generating set, to reach when serious non-synchronization paralleling takes place, in time the purpose that generating set is excised.Work as the generating set frequency in addition near system frequency, and the angle between the electromotive force of both sides hour takes place when not being very serious non-Switching Synchronization accident, because the impact to generating set itself causes, pulled into very soon synchronously by system as if generator, generally needn't the tripping generator.Method of the present invention has been taken into account above two aspects, by setting up non-same period of protective device at generating set, and utilize the auxiliary contact that generating set is connected to the circuit breaker of electrical network to open the non-Switching Synchronization protection that realizes generating set into amount and generating set output voltage, stator current value; It is characterized in that this method comprises the steps:
(1) protective device was sampled to the waveform of generating set machine end threephase current transformer, threephase potential transformer and was obtained the instantaneous value of current/voltage non-same period, obtain the plural form of each electric parameters by fourier algorithm, protective device was gathered described circuit breaker auxiliary node and was opened into amount described non-same period;
(2) judge whether stator current surpasses current setting Iset, and Iset generally gets 2.5Ie, and Ie is the generating set rated current, if stator current greater than described current setting, enters the judgement of step (3), otherwise this differentiates end, enters next time to differentiate;
(3) open into amount according to the circuit breaker auxiliary contact of the non-protective device collection same period, judge whether circuit breaker is closed, when not having the input of circuit breaker cut-off switch amount, judge breaker closing, and then judge that generating set is incorporated into the power networks, then enter the judgement of step (4), otherwise, this differentiates end, enters next time to differentiate;
(4) judge nearest voltage return time-delay T1 in the time generating set voltage whether be lower than voltage setting value Uset, Uset generally gets 0.8Ue, Ue is the generating set rated voltage, T1 generally gets 50ms, when returning time-delay T1 at voltage generating set voltage be lower than described voltage setting value in the time, enter step 7 (5) and carry out next step judgement, otherwise, this judges end, judges next time;
(5) open into amount according to the circuit breaker auxiliary contact of gathering, whether judgement once had the input of circuit breaker cut-off switch amount at the nearest time-delay T2 that returns in the time, be that circuit breaker once disconnected, the described time-delay T2 that returns generally gets 300ms, if judgement is delayed time T2 in the time in described nearest returning, judges that circuit breaker once disconnected, then enter step (6) and carry out the judgement of next step, otherwise this judges end, judges next time;
(6) when satisfying, the condition of step 2-5 further judges whether once do not have stator current in the time at nearest T2, be that current value is lower than a certain setting current threshold, if once occurring not having the situation of electric current in the time at nearest T2 is that current value is when being lower than a certain setting current threshold, current threshold is generally got 0.06Ie, enter step (7) and carry out next step judgement, otherwise this judges end, judges next time;
(7) when above step all conditions satisfies; be judged as generating set the non-Switching Synchronization accident has taken place; jump the circuit breaker that generating set is connected to electrical network through trip time T3 time-delay non-Switching Synchronization protection outlet; and do not need to start breaker failure; generating set is excised from system; thereby avoided non-Switching Synchronization to bring further harm for system and unit, wherein trip time T3 generally gets 0.1s.
Guard method disclosed by the invention can judge whether generating set the non-Switching Synchronization accident has taken place; and when judging that the non-Switching Synchronization accident has taken place generating set; this guard method can be jumped the circuit breaker that generating set is connected to electrical network through T3 time-delay non-Switching Synchronization protection outlet; and do not need to start breaker failure; generator is excised from system, thereby avoided non-Switching Synchronization to bring further harm for system and unit.
Description of drawings
Fig. 1 is in order to carry out the PSCAD/EMTDC model that non-synchronization paralleling emulation is built;
The result of Fig. 2 for system is carried out emulation under three kinds of situations.The simulation result of non-Switching Synchronization takes place when wherein, a is 90 ° of δ ≈; The simulation result of non-Switching Synchronization when being 120 ° of δ ≈, b takes place; The simulation result of non-Switching Synchronization when being 180 ° of δ ≈, c takes place;
Fig. 3 has shown the schematic flow sheet of non-Switching Synchronization protection;
Fig. 4 has shown the logic block-diagram of non-Switching Synchronization protection.
Embodiment
Also in conjunction with specific embodiments technical scheme of the present invention is described in further detail according to Figure of description below.
Reach or, closed the non-Switching Synchronization accident that takes place under the field switch situation at generating set, can utilize the PSCAD/EMTDC program to carry out emulation near rated speed.Non-Switching Synchronization situation under the different switching angle situations has been considered in emulation, sets up the model of emulation by accompanying drawing 1, considers that generator send the situation of electricity to Infinite bus system through main transformer.The result of emulation has clear and definite demonstration in accompanying drawing 2.Fig. 2 a has shown the simulation result of generator and 90 ° of generator non-Switching Synchronizations of the angle δ ≈ of system stator current set end voltage etc.; Fig. 2 b has shown the simulation result of generator and 120 ° of generator non-Switching Synchronizations of the angle δ ≈ of system stator current set end voltage etc.; Fig. 2 c has shown the simulation result of generator and 180 ° of generator non-Switching Synchronizations of the angle δ ≈ of system stator current set end voltage etc.
Simulation result as can be seen, in stator behind the non-Switching Synchronization, produce very big impulse current (greater than 2.5Ie), set end voltage obviously descends (less than 0.8Ue), and non-Switching Synchronization might pull-in step when δ＜120 °, works as δ〉120 °-as can not pull-in step.
Utilize circuit breaker auxiliary contact and low-voltage, overcurrent to form the method for non-Switching Synchronization protection in order to prevent that non-Switching Synchronization from causing damage to system or generating set, to the present invention proposes.The flow process of this method illustrates that as shown in Figure 3 this method comprises the steps:
Protective device was sampled to the waveform of generating set machine end threephase current transformer, threephase potential transformer and was obtained the instantaneous value of current/voltage non-same period, obtained the plural form of each electric parameters by fourier algorithm;
Judge whether stator current surpasses current setting Iset, and Iset generally gets 2.5Ie, and Ie is the generating set rated current;
Further judge the input of breaker contact point cut-off switch amount when above condition satisfies whether not, promptly generating set is incorporated into the power networks;
When above condition satisfies, further judge nearest T1 in the time generating set voltage whether be lower than voltage setting value Uset, Uset generally gets 0.8Ue, Ue is the generating set rated voltage, T1 generally gets 50ms;
Judge further at nearest T2 whether the input of breaker contact point cut-off switch amount was once arranged in the time when above condition satisfies, T2 gets 300ms;
When satisfying, above condition further judges whether once do not have stator current in the time at nearest T2, promptly once whether stator current value is lower than a certain setting current threshold, if when nearest T2 once went out stator current value and is lower than a certain setting current threshold in the time, then judging at nearest T2 did not once have stator current in the time; Wherein this current threshold is generally got 0.06Ie;
When not satisfying, above arbitrary condition all do not differentiate for not satisfying condition; this differentiates end; enter next time and differentiate; when satisfying, above all conditions is judged as the non-Switching Synchronization accident that taken place; jump generating set through trip time T3 time-delay non-Switching Synchronization protection outlet and be connected to the circuit breaker of electrical network, and do not need to start breaker failure, T3 generally to get 0.1 second; generating set is excised from system, thereby avoided non-Switching Synchronization to bring further harm for system and unit.
Be illustrated in figure 4 as the logic block-diagram of non-Switching Synchronization guard method of the present invention, between wherein following five conditions be and the door relation: judge that stator current surpasses current setting Iset; Not whether breaker contact point cut-off switch amount input; Nearest T1 in the time generating set voltage whether be lower than voltage setting value Uset; At nearest T2 the input of breaker contact point cut-off switch amount was arranged once in the time; Whether once there was not electric current in time at nearest T2.Protection is through T3 time-delay outlet when five conditions all satisfy.
Can see that by protection scheme and results of dynamic when serious non-synchronization paralleling took place, the non-Switching Synchronization protection can be excised generating set fast from system.
Claims (2)
1, a kind of asynchronous switch-on protection method for generator set, this method is by setting up non-same period of protective device at generating set, and the auxiliary contact that utilizes generating set to be connected to the circuit breaker of electrical network is opened the non-Switching Synchronization protection that realizes generating set into amount and generating set output voltage, stator current value; It is characterized in that this method may further comprise the steps:
(1) protective device was sampled to the waveform of generating set machine end threephase current transformer, threephase potential transformer and was obtained the instantaneous value of current/voltage non-same period, obtain the plural form of each electric parameters by fourier algorithm, protective device was gathered described circuit breaker auxiliary node and was opened into amount described non-same period;
(2) judge whether stator current surpasses current setting Iset, if stator current greater than described current setting, enters the judgement of step (3), otherwise this differentiates end, enters next time to differentiate;
(3) open into amount according to the circuit breaker auxiliary contact of the non-protective device collection same period, judge whether circuit breaker is closed, when not having the input of circuit breaker cut-off switch amount, judge breaker closing, and then judge that generating set is incorporated into the power networks, then enter the judgement of step (4), otherwise, this differentiates end, enters next time to differentiate;
(4) judge nearest voltage return time-delay T1 in the time generating set voltage whether be lower than voltage setting value Uset, when returning time-delay T1 at voltage generating set voltage be lower than described voltage setting value in the time, enter step (5) and carry out next step judgement, otherwise, this judges end, judges next time;
(5) open into amount according to the circuit breaker auxiliary contact of gathering, whether judgement once had the input of circuit breaker cut-off switch amount at the nearest time-delay T2 that returns in the time, be that circuit breaker once disconnected, if judge in described nearest returning and delay time T2 in the time, judge that circuit breaker once disconnected, then enter step (6) and carry out the judgement of next step, otherwise, this judges end, judges next time;
(6) when the condition of step 2-5 satisfies, further judge whether once do not have stator current in the time at nearest T2, be that current value is lower than a certain setting current threshold, if once occurring not having the situation of electric current in the time at nearest T2 is that current value is when being lower than a certain setting current threshold, enter step (7) and carry out next step judgement, otherwise this judges end, judges next time;
(7) when above step all conditions satisfies; be judged as generating set the non-Switching Synchronization accident has taken place; jump the circuit breaker that generating set is connected to electrical network through trip time T3 time-delay non-Switching Synchronization protection outlet; and do not need to start breaker failure; generating set is excised from system, thereby avoided non-Switching Synchronization to bring further harm for system and unit.
2, method as claimed in claim 1 is characterized in that, wherein said current setting Iset gets 2.5Ie, and Ie is the generating set rated current; Described voltage setting value Uset gets 0.8Ue, and Ue is the generating set rated voltage; Described voltage returns time-delay T1 and gets 50ms, and the described time-delay T2 that returns gets 300ms; Trip time T3 generally gets 0.1s; Be used to judge return the time-delay T2 whether once do not have the current threshold of stator current generally to get 0.06Ie in the time, Ie is the generating set rated current.
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| CN2008102389362A CN101431229B (en) | 2008-12-05 | 2008-12-05 | Asynchronous switch-on protection method for generator set |
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| CN2008102389362A CN101431229B (en) | 2008-12-05 | 2008-12-05 | Asynchronous switch-on protection method for generator set |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995473A (en) * | 2014-05-05 | 2014-08-20 | 中国南方电网有限责任公司电网技术研究中心 | System for analog and simulation of transformer protection device |
| CN104360157A (en) * | 2014-11-10 | 2015-02-18 | 国家电网公司 | Transformer interval breaker closing phase detection method |
| CN109347060A (en) * | 2018-11-20 | 2019-02-15 | 陕西航空电气有限责任公司 | A kind of differential error protection control method of aviation power system |
| CN111030186A (en) * | 2019-12-20 | 2020-04-17 | 广西桂冠电力股份有限公司 | Prevent to mistake and close return circuit of generator outlet switch |
| RU2722918C1 (en) * | 2019-08-15 | 2020-06-04 | Акционерное общество "Сибтехэнерго" - инженерная фирма по наладке, совершенствованию технологий и эксплуатации электро-энергооборудования предприятий и систем, АО "Сибтехэнерго" | Method for protection of a synchronous machine from an asynchronous mode (versions) |
| CN114415020A (en) * | 2022-01-20 | 2022-04-29 | 广东韶钢松山股份有限公司 | Test method for dynamic debugging of generator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4306263A (en) * | 1980-03-28 | 1981-12-15 | Gould Inc. | Synchronous closing system and latch therefor |
| US6002289A (en) * | 1997-03-31 | 1999-12-14 | Chen; Nanming | Voltage peak switch closing method for shunt capacitor energization |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995473A (en) * | 2014-05-05 | 2014-08-20 | 中国南方电网有限责任公司电网技术研究中心 | System for analog and simulation of transformer protection device |
| CN103995473B (en) * | 2014-05-05 | 2017-05-24 | 中国南方电网有限责任公司电网技术研究中心 | System for analog and simulation of transformer protection device |
| CN104360157A (en) * | 2014-11-10 | 2015-02-18 | 国家电网公司 | Transformer interval breaker closing phase detection method |
| CN109347060A (en) * | 2018-11-20 | 2019-02-15 | 陕西航空电气有限责任公司 | A kind of differential error protection control method of aviation power system |
| CN109347060B (en) * | 2018-11-20 | 2019-10-18 | 陕西航空电气有限责任公司 | A kind of differential error protection control method of aviation power system |
| RU2722918C1 (en) * | 2019-08-15 | 2020-06-04 | Акционерное общество "Сибтехэнерго" - инженерная фирма по наладке, совершенствованию технологий и эксплуатации электро-энергооборудования предприятий и систем, АО "Сибтехэнерго" | Method for protection of a synchronous machine from an asynchronous mode (versions) |
| CN111030186A (en) * | 2019-12-20 | 2020-04-17 | 广西桂冠电力股份有限公司 | Prevent to mistake and close return circuit of generator outlet switch |
| CN114415020A (en) * | 2022-01-20 | 2022-04-29 | 广东韶钢松山股份有限公司 | Test method for dynamic debugging of generator |
| CN114415020B (en) * | 2022-01-20 | 2023-03-14 | 广东韶钢松山股份有限公司 | Test method for dynamic debugging of generator |
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Owner name: BEIJING SIFANG JIBAO AUTOMATION CO., LTD. STATE EL Free format text: FORMER OWNER: BEIJING SIFANG JIBAO AUTOMATION CO., LTD. Effective date: 20130128 |
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Effective date of registration: 20130128 Address after: 310007 Huanglong Road, Zhejiang, Hangzhou, No. 8 Patentee after: Zhejiang Electric Power Company Patentee after: Beijing Sifang Jibao Automation Co., Ltd. Patentee after: State Grid Corporation of China Address before: 310007 Huanglong Road, Zhejiang, Hangzhou, No. 8 Patentee before: Zhejiang Electric Power Company Patentee before: Beijing Sifang Jibao Automation Co., Ltd. |