CN103427479B - 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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- CN103427479B CN103427479B CN201310354724.1A CN201310354724A CN103427479B CN 103427479 B CN103427479 B CN 103427479B CN 201310354724 A CN201310354724 A CN 201310354724A CN 103427479 B CN103427479 B CN 103427479B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000007858 starting material Substances 0.000 claims description 18
- 230000001681 protective effect Effects 0.000 claims description 8
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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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 when full factory's dead electricity, in order to ensure that unit can orderly closedown, avoid damage equipment, ensure that some important loads of power plant can uninterrupted power supply, as: 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 loads access " security personnel's section ", security personnel's section is the one section of bus (380V) ensureing unit safety, be with some full factories most important, the load that can not have a power failure, switched by backup auto-activating device, prevent the dead electricity of " security personnel's section ".1, adopt of current method introduces the switching that backup auto-activating device realizes emergency power supply more, but backup auto-activating device can only carry out the control of source-side switches according to voltage and electric current criterion, the booting-self controller that busbar voltage recovers rear important load cannot be realized, this kind of mode needs to purchase backup power automatic switching protection device simultaneously, increases cost; 2, DCS is the abbreviation of scattered control system (Distributed Control System), it is one, and what be made up of process control level and process monitoring level take communication network as the multi-level computer system of tie, can realize decentralized control, centralized operation, differentiated control, flexible configuration, configuration are convenient.But the simple DCS of dependence logic realizes switching also its obvious inferior position; because the voltage, the magnitude of current that gather in DCS system are the 4-20mA amount that transmitter provides; not as good as traditional protection, automatics in its reliability of sampling, precision and fault transient characteristic reactions; therefore carrying out as " permanent fault " on Logic judgment according to 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:
Based on a power plant emergency power supply changing method of DCS, method step as:
(1), by the protection exit of overcurrent protective device that the protection equipment for busbar that the section of security personnel in power plant configures and circuit breaker configure, circuit breaker position contact and diesel engine generator state, introduce the DCS system of power plant, carry out Logical Configuration;
(2) DCS system is according to load significance level, by the judgement to the switching value after Logical Configuration, circuit breaker, diesel engine generator are controlled, send the instruction starting load in batches, realize emergency power supply to switch, important load on emergency power supply is resumed operation automatically, keeps security personnel's section bus continued power.
For having A, the 300MW of B two sections of emergency power supply switched systems and above unit, A section emergency power supply changing method step is as follows:
(1) judge the under-voltage protection action of security personnel's A section bus protection and the protection act of circuit breaker DL1 protective device, if both while actions, next step of introducing method, if both are single action, then terminates;
(2) send and start 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 roads and judge;
1. the first via operates: security personnel B section bus is without under-voltage protection action, and DL3 is for dividing a position, DL7 for dividing a position, carries out steps A, otherwise terminates first via operation;
A, the continuation operation first via, send tripping DL2 instruction, judge DL2 state, DL2 state is a point position, then carry out step B, otherwise the end first via operates;
B, the continuation operation first via, send and be incorporated into DL7 instruction;
C, the continuation operation first via, judge whether the under-voltage protection action of security personnel A section bus protection disappears, if disappeared, then carry out step D, otherwise the end first via operates;
D, the continuation operation first via, according to the starting characteristic of motor, implement 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors respectively, operation completes;
2. the second dataway operation: security personnel's B section without under-voltage protection action, and DL3 be point position, DL7 is co-bit, carries out steps A, otherwise end the second dataway operation;
A, continuation operation second tunnel, send tripping DL2 and DL7 instruction, judge DL2 and DL7 state, DL2 and DL7 state is a point position, then illustrate that diesel engine can be with and carry, then carry out step B, otherwise terminate the second dataway operation after carrying out time delay in 3 minutes;
B, continuation operation second tunnel, send and be incorporated into DL7 instruction;
C, continuation operation second tunnel, judge whether the under-voltage protection action of security personnel A section bus protection disappears, if disappeared, then carries out step D, otherwise terminates the second dataway operation;
D, continuation operation second tunnel, according to the starting characteristic of motor, implement 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors respectively, operation completes;
3. the 3rd dataway operation: security personnel B section bus is without under-voltage protection action, and DL3 is co-bit, terminates the 3rd dataway 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 emergency power supply and switches, make full use of the object that power plant's existing device realizes emergency power supply switching, save cost.
2, compared with the present invention switches with traditional prepared auto restart, the present invention can be implemented in after security personnel's section restores electricity and automatically starts visual plant, realizes emergency power supply and is switched to the Automatic Control that important load restarts operation.
3, different from the method relying on DCS logic realization to switch merely, the present invention utilizes more professional protective device to carry out the judgement of " decompression ", " permanent fault ", makes switching more reliable.
4, the present invention makes full use of the flexible and changeable characteristic of DCS logic, realizes the switching mode under the different situations such as switch failure, permanent fault judgement that may occur in handoff procedure.
5, in view of DCS judges that the aspect such as low-voltage or permanent fault has obviously not enough inferior position compared with the protective device of specialty; the alternative DCS such as low pressure stage undervoltage protection and low pressure stage sectionalised protection device is utilized to differentiate low-voltage or permanent fault; differentiation result is sent into DCS in the mode of switching value; auxiliary DCS carries out Logic judgment, completes the switching of emergency power supply.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the A that 300MW and above unit have, B two sections of emergency power supply switched systems;
Fig. 2 is that the present invention has A, the A phase method step logic diagram of B two sections of emergency power supply switched systems.
Embodiment
Be further described the embodiment of the present invention below in conjunction with accompanying drawing, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
General principle
By the protection exit of overcurrent protective device that the protection equipment for busbar that the section of security personnel in power plant configures and circuit breaker configure; circuit breaker position contact and diesel engine generator state; introduce DCS (the distributed control systems) system of power plant; carry out Logical Configuration; by the judgement of switch amount; circuit breaker, diesel engine generator etc. are controlled, realizes emergency power supply and switch, keep security personnel's section bus continued power.
When after emergency power supply voltage resume, DCS system, according to load significance level, sends the instruction starting load in batches, the important load on emergency power supply can be resumed operation automatically, ensures that unit safety is stable and shuts down.
Based on a power plant emergency power supply changing method of DCS, as shown in Figure 1, two sections of emergency power supplies are the pattern that present 300MW and above large-sized unit are conventional, therefore select there is A, the switched system of B two sections of emergency power supplies makes example, and A phase method is identical with 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 act of circuit breaker DL1 protective device, if both simultaneously actions, next step of introducing method, if both are single action, then terminates;
(2) send and start 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 roads and judge;
1. the first via operates: security personnel B section is without under-voltage protection action, and DL3 is for dividing a position, DL7 for dividing a position, continues first via operation, otherwise the operation of the end first via;
A, the continuation operation first via, send tripping DL2 instruction, judge DL2 state, and DL2 state is a point position, then continue the first via and operate, otherwise terminate first via operation;
B, the continuation operation first via, send and be incorporated into DL7 instruction;
C, the continuation operation first via, judge whether the under-voltage protection action of A section bus protection disappears, if disappeared, then 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 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors respectively, operation completes;
2. the second road judges: security personnel's B section without under-voltage protection action, and DL3 be point position, DL7 is co-bit, continues the second dataway operation, otherwise end the second dataway operation;
A, continuation operation second tunnel, send tripping DL2 and DL7 instruction, judge DL2 and DL7 state, DL2 and DL7 state is a point position, then illustrate that diesel engine can be with and carry, continue the second dataway operation, otherwise terminate the second dataway operation after carrying out time delay in 3 minutes;
B, continuation operation second tunnel, send and be incorporated into DL7 instruction;
C, continuation operation second tunnel, judge whether the under-voltage protection action of A section bus protection disappears, if disappeared, then continue the second dataway operation, otherwise terminate the second dataway operation;
D, continuation operation second tunnel, according to the starting characteristic of motor, implement 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors respectively, operation completes;
3. the 3rd road judges: security personnel B section is without under-voltage protection action, and DL3 is co-bit, terminates the 3rd dataway operation.
Claims (1)
1., based on a power plant emergency power supply changing method of DCS, method step is as follows:
(1), by the protection exit of overcurrent protective device that the protection equipment for busbar that the section of security personnel in power plant configures and circuit breaker configure, circuit breaker position contact and diesel engine generator state, introduce the DCS system of power plant, carry out Logical Configuration;
(2) DCS system is according to load significance level, by the judgement to the switching value after Logical Configuration, controls circuit breaker, diesel engine generator, send the instruction starting load in batches, realize emergency power supply to switch, the important load on emergency power supply resumed operation automatically, it is characterized in that:
For having A, the 300MW of B two sections of emergency power supply switched systems and above unit, A section emergency power supply changing method step is as follows:
(1) judge the under-voltage protection action of security personnel's A section bus protection and the protection act of circuit breaker DL1 protective device, if both while actions, next step of introducing method, if both are single action, then terminates;
(2) send and start 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 roads and judge;
1. the first via operates: security personnel B section bus is without under-voltage protection action, and circuit breaker DL3 is for dividing a position, circuit breaker DL7 for dividing a position, carries out steps A, otherwise terminates first via operation;
A, the continuation operation first via, send tripping circuit breaker DL2 instruction, judge circuit breaker DL2 state, circuit breaker DL2 state is a point position, then carry out step B, otherwise the end first via operates;
B, the continuation operation first via, send and be incorporated into circuit breaker DL7 instruction;
C, the continuation operation first via, judge whether the under-voltage protection action of security personnel A section bus protection disappears, if disappeared, then carry out step D, otherwise the end first via operates;
D, the continuation operation first via, according to the starting characteristic of motor, implement 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors respectively, operation completes;
2. the second dataway operation: security personnel's B section without under-voltage protection action, and circuit breaker DL3 be point position, circuit breaker DL7 is co-bit, carries out steps A, otherwise end the second dataway operation;
A, continuation operation second tunnel, send tripping circuit breaker DL2 and circuit breaker DL7 instruction, judge circuit breaker DL2 and circuit breaker DL7 state, circuit breaker DL2 and circuit breaker DL7 state are a point position, then illustrate that diesel engine possesses load capacity, then carry out step B, otherwise terminate the second dataway operation after carrying out time delay in 3 minutes;
B, continuation operation second tunnel, send and be incorporated into circuit breaker DL7 instruction;
C, continuation operation second tunnel, judge whether the under-voltage protection action of security personnel A section bus protection disappears, if disappeared, then carries out step D, otherwise terminates the second dataway operation;
D, continuation operation second tunnel, according to the starting characteristic of motor, implement 0 second starter motor, 15 seconds starter motors and 30 seconds starter motors respectively, operation completes;
3. the 3rd dataway operation: security personnel B section bus is without under-voltage protection action, and circuit breaker DL3 is co-bit, terminates the 3rd dataway operation.
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| CN201310354724.1A CN103427479B (en) | 2013-08-15 | 2013-08-15 | Method for switching safety power sources of power plant on basis of DCS (distributed control system) |
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| CN201310354724.1A CN103427479B (en) | 2013-08-15 | 2013-08-15 | Method for switching safety power sources of power plant on basis of DCS (distributed control system) |
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Families Citing this family (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 |
| 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 |
| 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 |
| 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 |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638175A (en) * | 1984-07-03 | 1987-01-20 | United Technologies Corporation | Electric power distribution and load transfer system |
| CN102097856A (en) * | 2011-01-18 | 2011-06-15 | 北京四方继保自动化股份有限公司 | Spare power automatic switching programmable logic control method for plant supply of power station |
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2013
- 2013-08-15 CN CN201310354724.1A patent/CN103427479B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4638175A (en) * | 1984-07-03 | 1987-01-20 | United Technologies Corporation | Electric power distribution and load transfer system |
| CN102097856A (en) * | 2011-01-18 | 2011-06-15 | 北京四方继保自动化股份有限公司 | Spare power automatic switching programmable logic control method for plant supply of power station |
Non-Patent Citations (3)
| Title |
|---|
| 300MW 机组保安电源系统改造;宿星会等;《华电技术》;20090630;第31卷(第6期);第52页-55页 * |
| 在DCS中实现保安电源系统控制;雷春明;《热力发电》;20110131;第40卷(第1期);第66页-69页 * |
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