CN103427479A - Method for switching safety power sources of power plant on basis of DCS (distributed control system) - Google Patents
Method for switching safety power sources of power plant on basis of DCS (distributed control system) Download PDFInfo
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- CN103427479A CN103427479A CN2013103547241A CN201310354724A CN103427479A CN 103427479 A CN103427479 A CN 103427479A CN 2013103547241 A CN2013103547241 A CN 2013103547241A CN 201310354724 A CN201310354724 A CN 201310354724A CN 103427479 A CN103427479 A CN 103427479A
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Abstract
The invention relates to a method for switching safety power sources of a power plant on the basis of a DCS (distributed control system). The method includes steps of (1), inputting states of bus protection devices configured on safety sections in the power plants, protection outlets of overcurrent protection devices configured on circuit breakers, position junctions of the circuit breakers and diesel-driven generators into the DCS of the power plant and performing logical configuration; (2), enabling the DCS to judge switching values after logical configuration according to the importance of load, controlling the circuit breakers and the diesel-driven generators, and transmitting load starting instructions in batches to switch the safety power sources so that the important load on the safety power sources can be automatically recovered and run. The method has the advantages that 'voltage loss' and 'permanent faults' can be judged, so that the safety power sources can be reliably switched, existing devices of the power plant are sufficiently utilized to achieve the purpose of switching the safety power sources, and the cost is saved.
Description
Technical field
The invention belongs to machine unit automatic generation control technology field, particularly a kind of power plant emergency power supply changing method based on DCS.
Background technology
Generating set is in the situation that full factory dead electricity, in order to guarantee that unit can orderly closedown, avoid damage equipment, some important loads that guarantee power plant can uninterrupted power supply, as: the air preheater motor, fire inspection cooling blower, exchange sealing oil pump, the loads such as grease pump, to guarantee that unit can safe shutdown, current way is by these important load accesses " security personnel's section ", security personnel's section is the one section bus (380V) that guarantees unit safety, be with some full factories most important, the load that can not have a power failure, by backup auto-activating device, switched, prevent the dead electricity of " security personnel's section ".1, current method adopts more introduces the switching that backup auto-activating device is realized emergency power supply, but backup auto-activating device can only carry out the control of mains side switch according to voltage and electric current criterion, can't realize the self-starting control of the rear important load of busbar voltage recovery, this kind of mode need to be purchased backup power automatic switching protection device simultaneously, increases cost; 2, DCS is the abbreviation of scattered control system (Distributed Control System), it be one by process control level and process monitoring level, formed take the multi-level computer system that communication network is tie, can realize that decentralized control, centralized operation, differentiated control, flexible configuration, configuration are convenient.But rely on merely the DCS logic to realize that switching also has its obvious inferior position; because the voltage gathered in the DCS system, the magnitude of current are the 4-20mA amount that transmitter provides; too late traditional protection, automatics on the reliability of its sampling, precision and fault transient characteristic reactions; therefore carry out in the logic judgement as " permanent fault " in foundation voltage, electric current and switching value, " low-voltage action " can't wait traditional protection, automatics is accurate.
Summary of the invention
The object of the invention is to for the deficiencies in the prior art, a kind of power plant emergency power supply changing method based on DCS is provided.
The present invention solves its technical problem and takes following technical scheme to realize:
A kind of power plant emergency power supply changing method based on DCS, method step as:
(1) protection outlet, circuit breaker position contact and the diesel engine generator state of the overcurrent protective device configured on the protection equipment for busbar section of ensuring public security in power plant above configured and circuit breaker, introduce the DCS system of power plant, carries out Logical Configuration;
(2) the DCS system is according to the load significance level, judgement by the switching value to after Logical Configuration, circuit breaker, diesel engine generator are controlled, send the instruction that starts load in batches, realize the emergency power supply switching, make the important load on emergency power supply automatically resume operation, keep security personnel's section bus continued power.
And, for thering is A, the 300MW of two sections emergency power supply switched systems of B and above unit, A section emergency power supply changing method step is as follows:
(1) judge the under-voltage protection action of A section bus protection and the protection action of circuit breaker DL1 protective device, if both move simultaneously, next step of introducing method, if both are single action, finish;
(2) send and start the diesel engine generator instruction, start security personnel A section switch logic simultaneously;
(3), after starting security personnel A section switch logic, implement three tunnel judgements;
1. first via operation: security personnel B section is moved without under-voltage protection, and DL3 continues first via operation for a minute position, DL7 are a minute position, otherwise finishes first via operation;
A, continue the operation first via, send tripping DL2 instruction, judgement DL2 state, the DL2 state is a minute position, continues first via operation, otherwise finishes first via operation;
B, the continuation operation first via, send and be incorporated into the DL7 instruction;
C, the continuation operation first via, judge whether the under-voltage protection action of A section bus protection disappears, if disappear, continues first via operation, otherwise the operation of the end first via;
D, the continuation operation first via, according to the starting characteristic of motor, implement respectively 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors, and operation completes;
2. the second tunnel judgement: security personnel B section is moved without under-voltage protection, and DL3 continues the second dataway operation, otherwise finishes the second dataway operation for a minute position, DL7 are co-bit;
A, continue operation the second tunnel, send tripping DL2 and DL7 instruction, judgement DL2 and DL7 state, DL2 and DL7 state are a minute position, illustrate that diesel engine can be with to carry, and continue the second dataway operation, otherwise carry out end the second dataway operation after time delay in 3 minutes;
B, continuation operation the second tunnel, send and be incorporated into the DL7 instruction;
C, continuation operation the second tunnel, judge whether the under-voltage protection action of A section bus protection disappears, if disappear, continues the second dataway operation, otherwise finish the second dataway operation;
D, continuation operation the second tunnel, according to the starting characteristic of motor, implement respectively 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors, and operation completes;
3. Third Road judgement: security personnel B section is moved without under-voltage protection, and DL3 is co-bit, finishes the Third Road operation.
Advantage of the present invention and good effect are
1, the present invention can substitute backup power automatic switching protection device, uses the existing basic configuration of power plant to complete the emergency power supply switching, takes full advantage of the purpose that power plant's existing device is realized the emergency power supply switching, saves cost.
2, the present invention compares with traditional prepared auto restart switching, and the present invention can realize automatically starting visual plant after security personnel's section restores electricity, and realizes that emergency power supply is switched to the Automatic Control that important load restarts operation.
3, different from the simple method of DCS logic realization switching that relies on, the more professional protective device of utilization of the present invention carries out the judgement of " decompression ", " permanent fault ", makes switching more reliable.
4, the present invention takes full advantage of the flexible and changeable characteristic of DCS logic, the switching mode under the different situations such as the switch failure that realization may occur in handoff procedure, permanent fault judgement.
5, compare the inferior position with obvious deficiency with professional protective device in view of aspects such as DCS judgement low-voltage or permanent faults; utilize the alternative DCS such as low pressure stage undervoltage protection and low pressure stage sectionalised protection device to be differentiated low-voltage or permanent fault; send into DCS by differentiating result in the mode of switching value; auxiliary DCS carries out the logic judgement, completes the switching of emergency power supply.
The accompanying drawing explanation
Fig. 1 is the A that 300MW and above unit have, the electrical block diagram of two sections emergency power supply switched systems of B;
Fig. 2 is that the present invention has A, the A phase method step logic diagram of two sections emergency power supply switched systems of B.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is further described, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
Basic principle
The protection outlet of the overcurrent protective device configured on the protection equipment for busbar that the section of ensuring public security in power plant is above configured and circuit breaker; circuit breaker position contact and diesel engine generator state; introduce the DCS(distributed control systems of power plant) system; carry out Logical Configuration; judgement by switch amount; circuit breaker, diesel engine generator etc. is controlled, realized the emergency power supply switching, kept security personnel's section bus continued power.
After emergency power supply voltage recovers, the DCS system, according to the load significance level, is sent the instruction that starts load in batches, makes the important load on emergency power supply automatically to resume operation, and the assurance unit safety is stable shuts down.
A kind of power plant emergency power supply changing method based on DCS, as shown in Figure 1, two sections emergency power supplies are present 300MW and above large unit pattern commonly used, therefore select and there is A, the switched system of two sections emergency power supplies of B is made example, and the A phase method is identical with the B phase method, and wherein A phase method step is as follows:
(1) judge the under-voltage protection action of A section bus protection and the protection action of circuit breaker DL1 protective device, if both move simultaneously, next step of introducing method, if both are single action, finish;
(2) send and start the diesel engine generator instruction, start security personnel A section bus switch logic simultaneously;
(3), after starting security personnel A section bus switch logic, implement three tunnel judgements;
1. first via operation: security personnel B section is moved without under-voltage protection, and DL3 continues first via operation for a minute position, DL7 are a minute position, otherwise finishes first via operation;
A, continue the operation first via, send tripping DL2 instruction, judgement DL2 state, the DL2 state is a minute position, continues first via operation, otherwise finishes first via operation;
B, the continuation operation first via, send and be incorporated into the DL7 instruction;
C, the continuation operation first via, judge whether the under-voltage protection action of A section bus protection disappears, if disappear, continues first via operation, otherwise the operation of the end first via;
D, the continuation operation first via, according to the starting characteristic of motor, implement respectively 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors, and operation completes;
2. the second tunnel judgement: security personnel B section is moved without under-voltage protection, and DL3 continues the second dataway operation, otherwise finishes the second dataway operation for a minute position, DL7 are co-bit;
A, continue operation the second tunnel, send tripping DL2 and DL7 instruction, judgement DL2 and DL7 state, DL2 and DL7 state are a minute position, illustrate that diesel engine can be with to carry, and continue the second dataway operation, otherwise carry out end the second dataway operation after time delay in 3 minutes;
B, continuation operation the second tunnel, send and be incorporated into the DL7 instruction;
C, continuation operation the second tunnel, judge whether the under-voltage protection action of A section bus protection disappears, if disappear, continues the second dataway operation, otherwise finish the second dataway operation;
D, continuation operation the second tunnel, according to the starting characteristic of motor, implement respectively 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors, and operation completes;
3. Third Road judgement: security personnel B section is moved without under-voltage protection, and DL3 is co-bit, finishes the Third Road operation.
Claims (2)
1. the power plant emergency power supply changing method based on DCS, it is characterized in that: method step is as follows:
(1) protection outlet, circuit breaker position contact and the diesel engine generator state of the overcurrent protective device configured on the protection equipment for busbar section of ensuring public security in power plant above configured and circuit breaker, introduce the DCS system of power plant, carries out Logical Configuration;
(2) the DCS system is according to the load significance level, by the judgement of the switching value to after Logical Configuration, circuit breaker, diesel engine generator are controlled, send the instruction that starts load in batches, realize the emergency power supply switching, make the important load on emergency power supply automatically to resume operation.
2. the power plant emergency power supply changing method based on DCS according to claim 1, it is characterized in that: as a preferred embodiment of claim 1, for thering is A, the 300MW of two sections emergency power supply switched systems of B and above unit, A section emergency power supply changing method step is as follows:
(1) the protection action of the under-voltage protection action of judgement security personnel A section bus protection and circuit breaker DL1 protective device, if both move simultaneously, next step of introducing method, if both are single action, finish;
(2) send and start the diesel engine generator instruction, start security personnel A section bus switch logic simultaneously;
(3), after starting security personnel A section bus switch logic, implement three tunnel judgements;
1. first via operation: security personnel B section bus moves without under-voltage protection, and DL3 continues first via operation for a minute position, DL7 are a minute position, otherwise finishes first via operation;
A, continue the operation first via, send tripping DL2 instruction, judgement DL2 state, the DL2 state is a minute position, continues first via operation, otherwise finishes first via operation;
B, the continuation operation first via, send and be incorporated into the DL7 instruction;
C, the continuation operation first via, whether the under-voltage protection action of judgement security personnel A section bus protection disappears, if disappearance continues first via operation, otherwise finishes first via operation;
D, the continuation operation first via, according to the starting characteristic of motor, implement respectively 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors, and operation completes;
2. the second tunnel judgement: security personnel B section is moved without under-voltage protection, and DL3 continues the second dataway operation, otherwise finishes the second dataway operation for a minute position, DL7 are co-bit;
A, continue operation the second tunnel, send tripping DL2 and DL7 instruction, judgement DL2 and DL7 state, DL2 and DL7 state are a minute position, illustrate that diesel engine can be with to carry, and continue the second dataway operation, otherwise carry out end the second dataway operation after time delay in 3 minutes;
B, continuation operation the second tunnel, send and be incorporated into the DL7 instruction;
C, continuation operation the second tunnel, whether the under-voltage protection action of judgement security personnel A section bus protection disappears, if disappearance continues the second dataway operation, otherwise finishes the second dataway operation;
D, continuation operation the second tunnel, according to the starting characteristic of motor, implement respectively 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors, and operation completes;
3. Third Road judgement: security personnel B section bus moves without under-voltage protection, and DL3 is co-bit, finishes the Third Road operation.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683484A (en) * | 2013-12-31 | 2014-03-26 | 大唐贵州发耳发电有限公司 | Circuit switching device |
| CN106655478A (en) * | 2017-01-25 | 2017-05-10 | 云南水务投资股份有限公司 | Low-voltage emergency safety power supply system of household garbage power plant and control method of system |
| CN107591896A (en) * | 2017-11-08 | 2018-01-16 | 河南柴油机重工有限责任公司 | A kind of thermal power plant security personnel bussed supply power supply monitoring system |
| CN107842398A (en) * | 2017-11-22 | 2018-03-27 | 华润水泥技术研发有限公司 | A kind of steam turbine bavin electricity security personnel's control system and its control method |
| CN112003238A (en) * | 2020-08-17 | 2020-11-27 | 西安热工研究院有限公司 | Relay protection method for preventing power loss of security section of gas turbine power plant |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683484A (en) * | 2013-12-31 | 2014-03-26 | 大唐贵州发耳发电有限公司 | Circuit switching device |
| CN106655478A (en) * | 2017-01-25 | 2017-05-10 | 云南水务投资股份有限公司 | Low-voltage emergency safety power supply system of household garbage power plant and control method of system |
| CN106655478B (en) * | 2017-01-25 | 2023-07-25 | 云南水务投资股份有限公司 | Low-voltage emergency safety power supply system of household garbage power plant and control method thereof |
| CN107591896A (en) * | 2017-11-08 | 2018-01-16 | 河南柴油机重工有限责任公司 | A kind of thermal power plant security personnel bussed supply power supply monitoring system |
| CN107591896B (en) * | 2017-11-08 | 2024-01-30 | 河南柴油机重工有限责任公司 | Safety bus power supply monitoring system of thermal power plant |
| CN107842398A (en) * | 2017-11-22 | 2018-03-27 | 华润水泥技术研发有限公司 | A kind of steam turbine bavin electricity security personnel's control system and its control method |
| CN107842398B (en) * | 2017-11-22 | 2023-09-22 | 华润水泥技术研发有限公司 | Diesel-electric safety control system of steam turbine and control method thereof |
| CN112003238A (en) * | 2020-08-17 | 2020-11-27 | 西安热工研究院有限公司 | Relay protection method for preventing power loss of security section of gas turbine power plant |
| CN112003238B (en) * | 2020-08-17 | 2022-11-15 | 西安热工研究院有限公司 | Relay protection method for preventing power loss of security section of gas turbine power plant |
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