CN113067367B - Reverse power protection method, system, device and medium for turbine combined skip generator - Google Patents
Reverse power protection method, system, device and medium for turbine combined skip generator Download PDFInfo
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- CN113067367B CN113067367B CN202011516345.4A CN202011516345A CN113067367B CN 113067367 B CN113067367 B CN 113067367B CN 202011516345 A CN202011516345 A CN 202011516345A CN 113067367 B CN113067367 B CN 113067367B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a method, a system, a device and a medium for protecting reverse power of a turbine combined-tripping generator, wherein the method comprises a reverse power protection step and a backup protection step; the backup protection steps are as follows: the thermal control equipment receives a thermal control main valve closing command and generates a first trigger signal; the first board card receives a first trigger signal, judges whether a first main valve is closed, if so, generates a first machine jump signal, otherwise, ends; the second board card receives the first machine jump signal, judges whether the second main valve is closed, if so, generates the second machine jump signal, otherwise, ends; the first delayer delays the second machine jump signal; the low-power protection element receives the second machine jump signal, judges whether the power of the steam turbine is lower than the set power, if so, generates a second trigger signal, otherwise, ends; the non-electric quantity protection element receives a second trigger signal and controls the generator outlet switch to trip. Compared with the prior art, the invention has the advantages of high reliability, good safety and the like.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a method, a system, a device and a medium for protecting reverse power of a turbine combined-tripping generator.
Background
When the thermal power plant unit normally operates, the generator generates electric energy, and when the load of the unit is thrown to 0 due to a certain reason, such as the closing of an automatic main valve of a steam turbine or the extinguishment of a boiler, and the like, if the generator is still parallel to a power grid, the generator still keeps rotating after absorbing the electric energy from the power grid, and the generator becomes a motor to generate reverse power. When the reverse power operation occurs, if the unit is large, electricity is absorbed from the network more, the operation of the power grid is influenced, meanwhile, the steam turbine is operated without steam, the last stage of blade blast heat is large, no steam is cooled, and the long-time operation is unfavorable for the safety of the unit. Therefore, when the generator furnace of the generator set is in emergency or normal shutdown at present, the turbine or the boiler is stopped firstly, and then the generator trips through reverse power protection action.
At present, a program reverse power trip can be sent only when a plurality of reverse power conditions are met at the same time, and when the reverse power conditions are absent, the phase advance operation or the reactive power is near zero, the operation can be refused, so that the accident is enlarged.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method, a system, a device and a medium for protecting the reverse power of a turbine combined-tripping generator, which have high reliability and good safety.
The aim of the invention can be achieved by the following technical scheme:
the method for protecting the reverse power of the combined jump generator of the steam turbine comprises the steps of: the tripping of the switch at the outlet of the generator is controlled through the reverse power protection step and the backup protection step;
the backup protection steps specifically include:
101 The thermal control equipment receives a thermal control main valve closing command and generates a first trigger signal;
102 The first board card receives the first trigger signal and judges whether the first main valve is closed or not, if yes, a first machine jump signal is generated, otherwise, the step is finished;
103 The second board card receives the first machine jump signal and judges whether the second main valve is closed, if so, the second machine jump signal is generated, otherwise, the step is finished;
104 The first time delay device delays the second machine jump signal for a second set time length;
105 The low-power protection element receives the delayed second machine jump signal and judges whether the power of the steam turbine is lower than the set power, if yes, a second trigger signal is generated, otherwise, the step is finished;
106 The non-electric quantity protection element receives a second trigger signal and controls the generator outlet switch to trip;
the thermal control equipment, the first board card, the second board card, the first delay device, the low-power protection element and the non-electric quantity protection element are connected in series to form a control loop;
the first board card and the second board card are respectively connected with the position contacts of the first main valve and the second main valve.
The reverse power protection step specifically comprises the following steps:
201 The electric control equipment judges whether the generator set meets the reverse power condition, if so, a third trigger signal is generated, otherwise, the electric control equipment is ended;
202 The second delayer delays the third trigger signal for a first set duration;
203 The inverse power tripping element receives the delayed third trigger signal and controls the tripping of the generator outlet switch.
Further, the reverse power condition is specifically:
the following conditions are satisfied at the same time:
the outlet switch of the generator is in a closing state, so that the generator is ensured to be in a grid-connected state;
the contact point at the position of the main valve is in a closing state, so that the steam turbine is ensured to be disconnected with the power source;
the reverse power element acts to ensure that the generator is in a working condition of absorbing power to the power grid;
soft pressing plate input of power protection function of the electric control equipment;
program inverse power tripping of the electric control equipment;
the power protection function hard pressing plate of the electric control equipment is put into;
and starting the power protection of the electric control equipment, namely, the power protection judging program stored in the electric control equipment is in a starting state.
Further, the first set duration is smaller than the second set duration;
the first set time length is 0.1-1 s, and under the condition of reaching the reverse power action, the generator should trip rapidly within 1s, so that the safety of the generator is ensured;
the second set time is 2-3 min, which is the time for the power of the turbine to decrease to the vicinity of zero.
The utility model provides a turbine allies oneself with and jumps generator reverse power protection system, includes reverse power protection module and reserve protection module, reserve protection module include:
the thermal control command feedback unit is used for receiving a thermal control main valve closing command and generating a first trigger signal;
the first main valve feedback unit is used for receiving the first trigger signal and generating a first machine jump signal when the first main valve is closed;
the second main valve feedback unit is used for receiving the first machine jump signal and generating a second machine jump signal when the second main valve is closed;
the signal delay unit is used for receiving the second machine jump electric signal and delaying the second machine jump electric signal for a second set time length;
the low-power criterion unit is used for receiving the delayed second jump signal and generating a second trigger signal when the power of the steam turbine is lower than the set power;
the non-electric quantity protection unit is used for receiving the second trigger signal and controlling the tripping of the outlet switch of the generator;
the reverse power protection module comprises:
the reverse power feedback unit is used for generating a first trigger signal when the reverse power condition is met, and delaying the first trigger signal for a first set duration;
and the power protection unit is used for controlling the tripping of the switch at the outlet of the generator after receiving the delayed first trigger signal.
The reverse power protection device of the turbine combined-jump generator comprises a memory and a processor, wherein the memory stores a computer program, and the processor calls the program instruction to execute any turbine combined-jump generator reverse power protection method.
A computer readable storage medium comprising a computer program executable by a processor to implement any of the turbine-jump generator reverse power protection methods.
Compared with the prior art, the invention has the following beneficial effects:
the invention takes the backup protection as the supplement of the step reverse power protection step, can shut down the generator under the condition of lacking reverse power, prevent the generator from falling off, the first machine tripping signal and the second machine tripping signal are respectively the shut-down feedback of the two main valves of the steam turbine, ensure that the outlet switch of the generator can trip after the two main valves of the steam turbine are completely shut down, have high reliability, reduce the false action probability, delay the second machine tripping signal by the first delay device, ensure that the power of the steam turbine is reduced to be near zero from rated capacity, trip the generator, have good safety, simultaneously ensure that the power of the steam turbine is lower than the set power, trip the generator, and prevent the false signal or loop abnormality of the first board card and the second board card from causing the tripping of the generator, and have high reliability.
Drawings
FIG. 1 is a flow chart of a backup protection step;
fig. 2 is a schematic diagram of a control loop.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
Example 1
The method for protecting the reverse power of the combined jump generator of the steam turbine comprises the following steps of:
the tripping of the switch at the outlet of the generator is controlled through the reverse power protection step and the backup protection step;
as shown in fig. 1, the backup protection steps specifically include:
101 The thermal control equipment receives a thermal control main valve closing command and generates a first trigger signal;
102 The first board card receives the first trigger signal and judges whether the first main valve is closed or not, if yes, a first machine jump signal is generated, otherwise, the step is finished;
103 The second board card receives the first machine jump signal and judges whether the second main valve is closed, if so, the second machine jump signal is generated, otherwise, the step is finished;
104 The first time delay device delays the second machine jump signal for a second set time length;
105 The low-power protection element receives the delayed second machine jump signal and judges whether the power of the steam turbine is lower than the set power, if yes, a second trigger signal is generated, otherwise, the step is finished;
106 The non-electric quantity protection element receives a second trigger signal and controls the generator outlet switch to trip;
as shown in fig. 2, the thermal control device, the first board card, the second board card, the first delay device, the low-power protection element and the non-electric quantity protection element are connected in series to form a control loop;
the reverse power protection step specifically comprises:
201 The electric control equipment judges whether the generator set meets the reverse power condition, if so, a third trigger signal is generated, otherwise, the electric control equipment is ended;
202 The second delayer delays the third trigger signal for a first set duration;
203 The inverse power tripping element receives the delayed third trigger signal and controls the tripping of the generator outlet switch.
The thermal control equipment, the first board card, the second board card, the first delayer, the low-power protection element and the non-electric quantity protection element are connected in series to form a loop.
The reverse power condition is specifically:
the outlet switch of the generator is in a closing state, so that the generator is ensured to be in a grid-connected state;
the contact point at the position of the main valve is in a closing state, so that the steam turbine is ensured to be disconnected with the power source;
the reverse power element acts to ensure that the generator is in a working condition of absorbing power to the power grid;
soft pressing plate input of power protection function of the electric control equipment;
program inverse power tripping of the electric control equipment;
the power protection function hard pressing plate of the electric control equipment is put into;
and starting the power protection of the electric control equipment, namely, the power protection judging program stored in the electric control equipment is in a starting state.
The first set time length is 1s, and under the condition of reaching reverse power action, the generator should be tripped rapidly within 1s, so that the safety of the generator is ensured.
The second set time is 3min, which is the time for the power of the steam turbine to drop to the vicinity of zero, and the actual measurement time for the power of the steam turbine to drop from the rated capacity to near zero is near 2min after the steam turbine is switched on, so the second set time is 3min.
Example 2
The utility model provides a turbine allies oneself with and jumps generator reverse power protection system, includes reverse power protection module and reserve protection module, reserve protection module includes:
the thermal control command feedback unit is used for receiving a thermal control main valve closing command and generating a first trigger signal;
the first main valve feedback unit is used for receiving the first trigger signal and generating a first machine jump signal when the first main valve is closed;
the second main valve feedback unit is used for receiving the first machine jump signal and generating a second machine jump signal when the second main valve is closed;
the signal delay unit is used for receiving the second machine jump electric signal and delaying the second machine jump electric signal for a second set time length;
the low-power criterion unit is used for receiving the delayed second jump signal and generating a second trigger signal when the power of the steam turbine is lower than the set power;
and the non-electric quantity protection unit is used for receiving the second trigger signal and controlling the tripping of the generator outlet switch.
The reverse power protection module includes:
the reverse power feedback unit is used for generating a first trigger signal when the reverse power condition is met, and delaying the first trigger signal for a first set duration;
and the power protection unit is used for controlling the tripping of the switch at the outlet of the generator after receiving the delayed first trigger signal.
The reverse power condition is specifically:
the following conditions are satisfied at the same time:
the outlet switch of the generator is in a closing state, so that the generator is ensured to be in a grid-connected state;
the contact point at the position of the main valve is in a closing state, so that the steam turbine is ensured to be disconnected with the power source;
the reverse power element acts to ensure that the generator is in a working condition of absorbing power to the power grid;
soft pressing plate input of power protection function of the electric control equipment;
program inverse power tripping of the electric control equipment;
the power protection function hard pressing plate of the electric control equipment is put into;
and starting the power protection of the electric control equipment, namely, the power protection judging program stored in the electric control equipment is in a starting state.
Example 3
The reverse power protection device for the turbine combined-jump generator comprises a memory and a processor, wherein the memory stores a computer program, and the processor calls the program instructions to execute the reverse power protection method for the turbine combined-jump generator according to any one of the embodiment 1.
Example 4
A computer readable storage medium comprising a computer program executable by a processor to implement the turbine jump generator reverse power protection method of any of embodiment 1.
Embodiment 1, embodiment 2, embodiment 3 and embodiment 4 propose a method, a system, a device and a medium for protecting the reverse power of a turbine combined tripping generator, wherein the backup protection is used as the supplement of the step reverse power protection step, the generator can be closed under the condition of lacking reverse power to prevent the generator from falling off, the first and second machine tripping electric signals are respectively closing feedback of two main steam valves of the turbine, the two main steam valves of the turbine are ensured to be completely closed, the generator outlet switch can trip, the reliability is high, the misoperation probability is reduced, the first delay device delays the second machine tripping electric signal, the generator is tripped after the turbine power is ensured to be reduced to be near zero from the rated capacity, the safety is good, meanwhile, the low-power protection element can ensure that the generator is tripped after the turbine power is lower than the set power, and the false signal or loop of the first and second board card is prevented from being misissued, so that the generator trips, and the reliability is high.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The reverse power protection method for the turbine combined-tripping generator is characterized by comprising the following steps of:
the tripping of the switch at the outlet of the generator is controlled through the reverse power protection step and the backup protection step;
the backup protection steps specifically include:
101 Receiving a main valve closing command of a thermal control and generating a first trigger signal;
102 Receiving a first trigger signal, judging whether the first main valve is closed, if so, generating a first machine jump signal, otherwise, ending the step;
103 Receiving the first machine jump signal, judging whether the second main valve is closed, if so, generating the second machine jump signal, otherwise, ending the step;
104 The second machine tripping signal is delayed for a second set time length, the power of the turbine is ensured to be reduced to be near zero from rated capacity by delaying the second machine tripping signal, the first machine tripping signal and the second machine tripping signal are respectively the closing feedback of two main valves of the turbine, and the outlet switch of the generator can be tripped after the two main valves of the turbine are completely closed;
105 Receiving the delayed second machine jump signal, judging whether the power of the steam turbine is lower than the set power, if so, generating a second trigger signal, otherwise, ending the step;
106 Receiving a second trigger signal and controlling the generator outlet switch to trip.
2. The method for protecting the reverse power of the turbine combined cycle slip generator according to claim 1, wherein the reverse power protecting step specifically comprises the following steps:
201 The electric control equipment judges whether the generator set meets the reverse power condition, if so, a third trigger signal is generated, otherwise, the electric control equipment is ended;
202 The second delayer delays the third trigger signal for a first set duration;
203 The inverse power tripping element receives the delayed third trigger signal and controls the tripping of the generator outlet switch.
3. The method for protecting the reverse power of the turbine combined cycle slip generator according to claim 2, wherein the reverse power condition comprises:
the generator outlet switch is in a closing state;
the main valve position contact is in a closing state.
4. The method for protecting reverse power of a turbine and jump generator according to claim 2, wherein the first set time period is shorter than the second set time period.
5. The method for protecting reverse power of a turbine and jump generator according to claim 2, wherein the first set time period is 0.1-1 s.
6. The method for protecting the reverse power of the turbine and the jump generator according to claim 1, wherein the second set time period is 2-3 min.
7. The utility model provides a turbine allies oneself with and jumps generator reverse power protection system which characterized in that includes reverse power protection module and reserve protection module, reserve protection module include:
the thermal control command feedback unit is used for receiving a thermal control main valve closing command and generating a first trigger signal;
the first main valve feedback unit is used for receiving the first trigger signal and generating a first machine jump signal when the first main valve is closed;
the second main valve feedback unit is used for receiving the first machine jump signal and generating a second machine jump signal when the second main valve is closed;
the signal delay unit is used for receiving the second machine jump electric signal and delaying the second machine jump electric signal for a second set time length;
the low-power criterion unit is used for receiving the delayed second jump signal and generating a second trigger signal when the power of the steam turbine is lower than the set power;
and the non-electric quantity protection unit is used for receiving the second trigger signal and controlling the tripping of the generator outlet switch.
8. The system of claim 7, wherein the reverse power protection module comprises:
the reverse power feedback unit is used for generating a first trigger signal when the reverse power condition is met, and delaying the first trigger signal for a first set duration;
and the power protection unit is used for controlling the tripping of the switch at the outlet of the generator after receiving the delayed first trigger signal.
9. A turbine jump generator reverse power protection device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor invokes the program instructions to execute the turbine jump generator reverse power protection method according to any one of claims 1 to 4.
10. A computer readable storage medium comprising a computer program executable by a processor to implement the turbine skip-coupled generator reverse power protection method of any of claims 1-4.
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| CN202011516345.4A CN113067367B (en) | 2020-12-21 | 2020-12-21 | Reverse power protection method, system, device and medium for turbine combined skip generator |
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| CN202011516345.4A CN113067367B (en) | 2020-12-21 | 2020-12-21 | Reverse power protection method, system, device and medium for turbine combined skip generator |
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| CN113067367B true CN113067367B (en) | 2023-08-11 |
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| CN114421426B (en) * | 2021-12-16 | 2023-08-25 | 华电电力科学研究院有限公司 | Generator power protection method and device |
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