CN113067367A - Method, system, device and medium for protecting reverse power of steam turbine combined tripping generator - Google Patents
Method, system, device and medium for protecting reverse power of steam turbine combined tripping generator Download PDFInfo
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- CN113067367A CN113067367A CN202011516345.4A CN202011516345A CN113067367A CN 113067367 A CN113067367 A CN 113067367A CN 202011516345 A CN202011516345 A CN 202011516345A CN 113067367 A CN113067367 A CN 113067367A
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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)
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- Control Of Turbines (AREA)
Abstract
The invention relates to a method, a system, a device and a medium for protecting the 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 step is as follows: the method comprises the following steps that a thermal control device receives a main valve closing command of thermal control and generates a first trigger signal; the first board card receives a first trigger signal and judges whether a first main throttle valve is closed or not, if so, a first trip signal is generated, and if not, the process is ended; the second board card receives the first mechanical trip electric signal and judges whether the second main throttle valve is closed, if so, the second mechanical trip electric signal is generated, and if not, the operation is finished; the first delayer delays the second mechanical trip signal; the low-power protection element receives the second turbine trip signal and judges whether the power of the steam turbine is lower than the set power, if so, a second trigger signal is generated, and if not, the operation is finished; and the non-electric quantity protection element receives the 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 the reverse power of a steam turbine combined-tripping generator.
Background
When a thermal power plant unit normally operates, the generator generates electric energy, when the unit is switched off to 0 in operation due to some reasons such as the closing of an automatic main steam valve of a steam turbine or the fire extinguishing of a boiler, the generator still absorbs the electric energy from the power grid if the generator is still parallel to the power grid, the rotation is still kept, and the generator becomes a motor at this time to generate reverse power. When the reverse power operation occurs, if the unit is large, more electricity is absorbed from the power grid, the operation of the power grid is influenced, meanwhile, the steam turbine operates without steam, the blast heating of the last stage of blades is large, no steam is cooled, and the long-time operation is not beneficial to the safety of the unit. Therefore, when the generator set engine furnace is emergently or normally stopped at present, the turbine or the boiler is stopped firstly, and then the generator is tripped through the reverse power protection action.
At present, programmed reverse power tripping can be performed only when a plurality of reverse power conditions are required to be met simultaneously, and the tripping can be rejected when the reverse power conditions are lacked, the phase-advance operation is carried out or the reactive power is close to zero, 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 purpose of the invention can be realized by the following technical scheme:
a method for protecting the reverse power of a steam turbine combined tripping generator is disclosed, wherein the steam turbine is provided with a first main throttle valve and a second main throttle valve, the steam turbine is connected with a thermal control device, the generator is connected with an electric control device, and the method specifically comprises the following steps: controlling the tripping of an outlet switch of the generator through a reverse power protection step and a backup protection step;
the backup protection steps are specifically as follows:
101) the method comprises the following steps that a thermal control device receives a main valve closing command of thermal control and generates a first trigger signal;
102) the first board card receives the first trigger signal and judges whether the first main throttle valve is closed or not, if so, a first trip signal is generated, and if not, the step is ended;
103) the second board card receives the first mechanical trip electricity signal and judges whether the second main throttle valve is closed or not, if so, the second mechanical trip electricity signal is generated, and if not, the step is ended;
104) the first delayer delays the second set time length of the second mechanical trip signal;
105) the low-power protection element receives the delayed second turbine trip signal and judges whether the power of the steam turbine is lower than the set power, if so, a second trigger signal is generated, and if not, the step is ended;
106) the non-electric quantity protection element receives the second trigger signal and controls the generator outlet switch to trip;
the thermal control device, 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 control loop;
the first board card and the second board card are respectively connected with position contacts of the first main throttle valve and the second main throttle valve.
The reverse power protection step specifically comprises:
201) the electric control equipment judges whether the generator set meets a reverse power condition, if so, a third trigger signal is generated, and if not, the operation is finished;
202) the second delayer delays the third trigger signal for a first set time length;
203) and the reverse power tripping element receives the delayed third trigger signal and controls the generator outlet switch to trip.
Further, the reverse power condition is specifically as follows:
simultaneously, the following conditions are met:
the generator outlet switch is in a closing state, so that the generator is ensured to be in a grid-connected state;
the position contact of the main valve is in a closing state, so that the steam turbine is ensured to be disconnected from 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;
the power protection function soft pressing plate of the electric control equipment is put into operation;
tripping the program reverse power switching of the electric control equipment;
putting a power protection function hard pressing plate of the electric control equipment;
and (4) starting the power protection of the electric control equipment, namely, enabling a power protection judgment program stored in the electric control equipment to be in a starting state.
Further, the first set time length is less than a second set time length;
the first set time is 0.1-1 s, and the generator is required to be tripped quickly within 1s under the condition of achieving the action of reverse power, so that the safety of the generator is ensured;
and the second set time is 2-3 min, which is the time for the power of the steam turbine to be reduced to be near zero.
The utility model provides a steam turbine allies oneself with jump generator reverse power protection system, includes reverse power protection module and backup protection module, backup protection module include:
the thermal control command feedback unit is used for receiving a main valve closing command of thermal control and generating a first trigger signal;
the first main throttle feedback unit is used for receiving a first trigger signal and generating a first trip signal when the first main throttle is closed;
the second main throttle feedback unit is used for receiving the first mechanical trip electric signal and generating a second mechanical trip electric signal when the second main throttle is closed;
the signal delay unit is used for receiving the second mechanical trip signal and delaying the second mechanical trip signal for a second set time length;
the low-power criterion unit is used for receiving the delayed second mechanical trip 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 generator outlet switch to trip;
the reverse power protection module comprises:
the reverse power feedback unit is used for generating a first trigger signal when a reverse power condition is met and delaying the first trigger signal for a first set time length;
and the power protection unit is used for controlling the generator outlet switch to trip after receiving the delayed first trigger signal.
The device comprises a memory and a processor, wherein the memory stores a computer program, and the processor calls the program instruction to execute any one of the turbine combined-jump generator reverse power protection methods.
A computer readable storage medium comprising a computer program executable by a processor to implement any of the steam turbine combined-hop generator reverse power protection methods.
Compared with the prior art, the invention has the following beneficial effects:
the invention takes backup protection as the supplement of the reverse power protection step, can close the generator under the condition of lacking the reverse power, prevent the generator from falling, the first machine trip signal and the second machine trip signal are the closing feedback of two main steam gates of the steam turbine respectively, ensure that the generator outlet switch can only trip after the two main steam gates of the steam turbine are completely closed, the reliability is high, reduce the probability of misoperation, the first delayer delays the second machine trip signal, ensure that the generator trips after the power of the steam turbine is reduced to be near zero from the rated capacity, the safety is good, meanwhile, the low-power protection element can ensure that the generator trips after the power of the steam turbine is lower than the set power, prevent the first board card and the second board card from mistakenly sending signals or circuit abnormality to cause the generator tripping runaway, and the reliability is high.
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 is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1
A steam turbine combined tripping generator reverse power protection method is provided, wherein the steam turbine is provided with a first main throttle valve and a second main throttle valve, the steam turbine is connected with a thermal control device, the generator is connected with an electric control device, and the method specifically comprises the following steps:
controlling the tripping of an outlet switch of the generator through a reverse power protection step and a backup protection step;
as shown in fig. 1, the backup protection step specifically includes:
101) the method comprises the following steps that a thermal control device receives a main valve closing command of thermal control and generates a first trigger signal;
102) the first board card receives the first trigger signal and judges whether the first main throttle valve is closed or not, if so, a first trip signal is generated, and if not, the step is ended;
103) the second board card receives the first mechanical trip electricity signal and judges whether the second main throttle valve is closed or not, if so, the second mechanical trip electricity signal is generated, and if not, the step is ended;
104) the first delayer delays the second set time length of the second mechanical trip signal;
105) the low-power protection element receives the delayed second turbine trip signal and judges whether the power of the steam turbine is lower than the set power, if so, a second trigger signal is generated, and if not, the step is ended;
106) the non-electric quantity protection element receives the 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 delayer, 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 steps are specifically as follows:
201) the electric control equipment judges whether the generator set meets a reverse power condition, if so, a third trigger signal is generated, and if not, the operation is finished;
202) the second delayer delays the third trigger signal for a first set time length;
203) and the reverse power tripping element receives the delayed third trigger signal and controls the generator outlet switch to trip.
The thermal control device, 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 as follows:
the generator outlet switch is in a closing state, so that the generator is ensured to be in a grid-connected state;
the position contact of the main valve is in a closing state, so that the steam turbine is ensured to be disconnected from 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;
the power protection function soft pressing plate of the electric control equipment is put into operation;
tripping the program reverse power switching of the electric control equipment;
putting a power protection function hard pressing plate of the electric control equipment;
and (4) starting the power protection of the electric control equipment, namely, enabling a power protection judgment program stored in the electric control equipment to be in a starting state.
The first set time is 1s, and under the condition of achieving the action of reverse power, the generator should be tripped quickly within 1s, so that the safety of the generator is guaranteed.
The second set time is 3min, which is the time taken for the power of the steam turbine to drop to near zero, and the actual measurement time for the power of the steam turbine to drop from the rated capacity to near zero after the steam turbine is opened is near 2min, so the second set time is 3 min.
Example 2
The utility model provides a steam turbine allies oneself with jump generator reverse power protection system, includes reverse power protection module and reserve protection module, and reserve protection module includes:
the thermal control command feedback unit is used for receiving a main valve closing command of thermal control and generating a first trigger signal;
the first main throttle feedback unit is used for receiving a first trigger signal and generating a first trip signal when the first main throttle is closed;
the second main throttle feedback unit is used for receiving the first mechanical trip electric signal and generating a second mechanical trip electric signal when the second main throttle is closed;
the signal delay unit is used for receiving the second mechanical trip signal and delaying the second mechanical trip signal for a second set time length;
the low-power criterion unit is used for receiving the delayed second mechanical trip 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 generator outlet switch to trip.
The reverse power protection module includes:
the reverse power feedback unit is used for generating a first trigger signal when a reverse power condition is met and delaying the first trigger signal for a first set time length;
and the power protection unit is used for controlling the generator outlet switch to trip after receiving the delayed first trigger signal.
The reverse power condition is specifically as follows:
simultaneously, the following conditions are met:
the generator outlet switch is in a closing state, so that the generator is ensured to be in a grid-connected state;
the position contact of the main valve is in a closing state, so that the steam turbine is ensured to be disconnected from 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;
the power protection function soft pressing plate of the electric control equipment is put into operation;
tripping the program reverse power switching of the electric control equipment;
putting a power protection function hard pressing plate of the electric control equipment;
and (4) starting the power protection of the electric control equipment, namely, enabling a power protection judgment program stored in the electric control equipment to be in a starting state.
Example 3
The device for protecting the reverse power of the steam 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 the method for protecting the reverse power of the steam turbine combined jump generator according to any embodiment 1.
Example 4
A computer readable storage medium comprising a computer program executable by a processor to implement the method of turbine combined-hop generator reverse power protection according to any of embodiment 1.
Embodiment 1, embodiment 2, embodiment 3, and embodiment 4 provide a method, a system, a device, and a medium for reverse power protection of a turbine generator, wherein backup protection is used as a supplement to the step of reverse power protection, the generator can be shut down in the absence of reverse power, and the generator is prevented from falling, a first trip signal and a second trip signal are respectively used for the closing feedback of two main gates of the turbine, so as to ensure that the generator outlet switch can trip after the two main gates of the turbine are completely closed, the reliability is high, the malfunction probability is reduced, the first time delay unit delays the second trip signal, the generator is tripped after the turbine power is reduced from the rated capacity to the vicinity of zero, the safety is high, and meanwhile, the low-power protection component can ensure that the generator trips after the turbine power is lower than the set power, thereby preventing the first board card and the second board card from generating signals by mistake or the circuit is abnormal to cause the generator trip, the reliability is high.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A method for protecting the reverse power of a steam turbine combined tripping generator is characterized by comprising the following steps:
controlling the tripping of an outlet switch of the generator through a reverse power protection step and a backup protection step;
the backup protection steps are specifically as follows:
101) receiving a main valve command of thermal control closing, and generating a first trigger signal;
102) receiving a first trigger signal, judging whether a first main throttle valve is closed or not, if so, generating a first trip signal, and if not, finishing the step;
103) receiving a first mechanical trip electric signal, judging whether a second main throttle valve is closed or not, if so, generating a second mechanical trip electric signal, and if not, finishing the step;
104) delaying the second set time length of the second mechanical trip signal;
105) receiving the delayed second turbine trip signal, judging whether the power of the turbine is lower than the set power, if so, generating a second trigger signal, and if not, finishing the step;
106) and receiving a second trigger signal and controlling the generator outlet switch to trip.
2. The method for protecting the reverse power of the steam turbine combined-tripping generator according to claim 1, wherein the reverse power protection step specifically comprises the following steps:
201) the electric control equipment judges whether the generator set meets a reverse power condition, if so, a third trigger signal is generated, and if not, the operation is finished;
202) the second delayer delays the third trigger signal for a first set time length;
203) and the reverse power tripping element receives the delayed third trigger signal and controls the generator outlet switch to trip.
3. A method of reverse power protection for a steam turbine combined-hop generator according to claim 2, wherein said reverse power condition comprises:
the generator outlet switch is in a closing state;
the contact point at the position of the main valve is in a closing state.
4. The method of reverse power protection for a steam turbine combined-hop generator according to claim 2, wherein the first set period of time is less than the second set period of time.
5. The method for protecting the reverse power of a steam turbine combined-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 steam turbine combined-jump generator according to claim 1, wherein the second set time period is 2-3 min.
7. The utility model provides a steam turbine allies oneself with jump 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 main valve closing command of thermal control and generating a first trigger signal;
the first main throttle feedback unit is used for receiving a first trigger signal and generating a first trip signal when the first main throttle is closed;
the second main throttle feedback unit is used for receiving the first mechanical trip electric signal and generating a second mechanical trip electric signal when the second main throttle is closed;
the signal delay unit is used for receiving the second mechanical trip signal and delaying the second mechanical trip signal for a second set time length;
the low-power criterion unit is used for receiving the delayed second mechanical trip 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 generator outlet switch to trip.
8. The reverse power protection system for a steam turbine combined-hop generator according to claim 7, wherein the reverse power protection module comprises:
the reverse power feedback unit is used for generating a first trigger signal when a reverse power condition is met and delaying the first trigger signal for a first set time length;
and the power protection unit is used for controlling the generator outlet switch to trip after receiving the delayed first trigger signal.
9. A turbine combined-hop generator reverse power protection device, characterized by comprising a memory and a processor, wherein the memory stores a computer program, and the processor calls the program to execute the turbine combined-hop 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 perform the method for turbine combined-hop generator reverse power protection according to any of claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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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 CN113067367B (en) | 2023-08-11 |
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| CN113067367B (en) | 2023-08-11 |
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