CN112366680B - Power failure self-recovery method for whole factory of station service under weak power network without external power supply - Google Patents
Power failure self-recovery method for whole factory of station service under weak power network without external power supply Download PDFInfo
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- 238000011084 recovery Methods 0.000 title claims abstract description 26
- 230000005611 electricity Effects 0.000 claims abstract description 24
- 238000010248 power generation Methods 0.000 claims abstract description 19
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- 239000003921 oil Substances 0.000 claims 2
- 239000010687 lubricating oil Substances 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 6
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Classifications
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
Abstract
The invention discloses a station service power full-station power failure self-recovery method under a weak power network without an external power supply, which comprises the steps of collecting relevant signals of station service power and a generator, starting a power failure self-recovery process, a shutdown-no-load process, a shutdown-power generation process, a no-load-power generation process and a shutdown process. The invention can judge and detect the power failure accident of the whole factory by monitoring the important signals such as the state, the voltage and the like of each breaker of the power system of the whole factory in real time. When the occurrence of power failure accidents is monitored, the diesel generator is automatically started to perform switching operation of self-recovery of station service electricity, normal power supply operation of the diesel generator to the station service electricity is realized in a short time, and the reliability of the station service electricity of the whole station is improved. After the accident of power failure of the whole plant, the automatic and quick recovery of the plant power is realized, the inert shutdown of the unit under the condition of shutdown of auxiliary equipment is avoided, the damage and the expansion of the accident of the unit equipment are avoided, and the electric quantity loss and the economic loss are reduced.
Description
Technical Field
The invention relates to a station service power failure self-recovery method under a weak power network without an external power supply, belonging to the technical field of hydroelectric generation.
Background
At present, a plurality of hydropower projects in underdeveloped areas are operated in a severe environment with a weak power grid and no external power supply, and the safety of station service becomes extremely important for the safety and stability of the whole plant.
Once the station service disappears, the unit is stopped at all auxiliary equipment, and the serious risk of accident stopping is faced, so that the power supply cannot be ensured, the damage of the unit equipment is possibly caused, and the influence of the accident is enlarged.
Moreover, once power loss of the station service occurs, the station service is only recovered by emergency disposal of operators on duty at present. From the entrance of emergency personnel, starting a diesel generator, switching operation and restoring normal operation of a unit, tens of minutes and even 1-2 hours are often required to be completed, and great negative influence is brought to economic benefit and social benefit of a power plant.
Hydropower plants with weak power grids and no external power supply usually adopt a minimum of 2 units to run in the load low-valley period so as to ensure that station power does not disappear due to primary faults. Such an arrangement, while improving the reliability of the plant electricity, severely reduces the utilization of the water energy resources and the overall economic benefit of the plant.
Disclosure of Invention
The invention aims to solve the problems and the defects, and is realized by adopting the following method:
1) The PLC device is used for monitoring important signals such as the state, voltage, current and the like of each breaker of the whole factory power system in real time, and can judge and detect the whole factory power failure accident without delay. When the occurrence of the power failure accident of the station service of the whole plant is monitored, the emergency diesel generator is automatically started, the switching operation of the station service for self-recovery is automatically carried out, the normal power supply operation of the diesel generator to the station service is realized in a short time, and the reliability of the station service of the whole plant is improved.
2) After the accident of power failure of the whole plant, the automatic and quick recovery of the plant power is realized, the inert shutdown of the unit under the condition of shutdown of auxiliary equipment is avoided, the damage and the expansion of the accident of the unit equipment are avoided, and the electric quantity loss and the economic loss are reduced.
3) The number of units operated for ensuring the safety of the station service in the load valley period is reduced, the station service is saved, the water energy utilization rate is improved, and the comprehensive economic benefit of the power plant is improved.
The specific technical scheme of the method comprises the following steps:
step S1, collecting three-phase line voltages of the buses of sections I, II and III of the 10kV factory power, judging the quality of the three-phase line voltages, and sending related signals of the diesel generator to a public LCU programmable logic controller of a monitoring system, and compiling a factory power failure self-recovery process, a state criterion and a starting condition criterion of the diesel generator and a three-section starting and stopping process of the whole factory power to realize a quick self-recovery function after the factory power failure.
Step S2, a power-off self-recovery flow starting source: when the voltages of the section I, the section II and the section III of the 10kV factory power supply are smaller than 10% rated voltage, judging that the factory power supply of the whole factory is lost, and starting the process automatically; the judgment basis is as follows:
(public 10kV I section line voltage Uab <10%ue and good quality of measurement points) and (public 10kV I section line voltage Ubc <10%ue and good quality of measurement points) and (public 10kV I section line voltage Uca <10%ue and good quality of measurement points) and (public 10kV II section line voltage Uab <10%ue and good quality of measurement points) and (public 10kV II section line voltage Ubc <10%ue and good quality of measurement points) and (public 10kV II section line voltage Uca <10%ue and good quality of measurement points) and (public 10kV III section line voltage Uab <10%ue and good quality of measurement points) and (public 10kV III section line voltage Uca <10%ue and good quality of measurement points).
Step S3, "stop-no load" flow: starting the flow, judging that the outlet breaker of the diesel generator is in the split position, judging that the starting condition of the diesel generator is met, starting the diesel generator, judging that the diesel generator is in an idle state when the diesel generator is started, and ending the flow when the diesel generator is limited for 60 s.
Step S4, "no-load-power generation" flow: the method comprises the steps of starting a flow, checking that station service electricity is lost, judging that a diesel generator is in an idle state, disconnecting a 10kV station service I-section bus incoming line breaker, a contact breaker and a feeder breaker, judging that the 10kV station service I-section bus incoming line breaker and the contact breaker are all disconnected in time-limited 10s, opening and closing a switch to a diesel generator outlet breaker, checking that an outlet breaker is closed in time-limited 10s, judging that the diesel generator is in a power generation state, and ending the flow.
Step S5, "shutdown-power generation" process: the method comprises the steps of starting a flow, judging that an outlet circuit breaker of a diesel generator is in a split position, judging that a starting condition of the diesel generator is met, starting a starting command to the diesel generator, judging that the diesel generator is in an idle state in a time limit of 60s, checking that station service electricity is lost, judging that the diesel generator is in the idle state, disconnecting a 10kV station service electricity I-section bus inlet circuit breaker, a connecting circuit breaker, a feeder circuit breaker, judging that the 10kV station service electricity I-section bus inlet circuit breaker and the connecting circuit breaker are all disconnected in a time limit of 10s, opening a closing command to the outlet circuit breaker of the diesel generator, checking that three phases of the outlet circuit breaker are closed in the time limit of 10s, judging that the diesel generator is in a power generation state, and ending the flow.
Step S6, "shutdown" flow: starting the flow, judging that the outlet breaker of the diesel generator is in a split state, starting and stopping the diesel generator, judging that the diesel generator is in a stop state when the time is limited for 120s, and ending the flow.
Step S7, a process of 'power failure and self-starting of factory service' is as follows: the method comprises the steps of losing power of the whole plant, delaying for 2s, starting a process, judging that an outlet breaker of a diesel generator is in a split position, judging that a starting condition of the diesel generator is met, starting a starting command to the diesel generator, judging that the diesel generator is in an idle state in time limit 60s, checking that the power of the whole plant is lost, judging that the diesel generator is in the idle state, disconnecting a 10kV plant power I-section bus inlet breaker, a contact breaker and a feeder breaker, judging that the 10kV plant power I-section bus inlet breaker and the contact breaker are all disconnected in time limit 10s, opening a closing command to the outlet breaker of the diesel generator, checking that three phases of the outlet breaker are closed in time limit 10s, judging that the diesel generator is in a power generation state, and ending the process.
Aiming at the diesel generator, the invention simultaneously sets the functions of one-key rotation no-load, power generation and stop of the monitoring upper computer operator station, and can develop the test of periodically and remotely starting the diesel generator and stop the operation of the diesel generator after the black start of the unit is finished.
The beneficial effects of the invention are as follows:
(1) Improving the reliability of the station service
Compared with the traditional self-recovery mode of the station service electricity, the time is greatly shortened, and the reliability of the station service electricity is obviously improved.
(2) Direct economic benefits
In the low-valley stage of the power plant, only 1 unit is started to operate with station service electricity, so that the self-power utilization of the unit is saved, and the water energy utilization rate is improved.
(3) Indirect benefit
The power plant has more reliable power operation and stable power plant operation, and improves the overall external image of the power plant.
Drawings
Fig. 1: the diesel generator of the present invention is a start-stop to idle flow chart.
Fig. 2: the diesel generator of the present invention starts-idles to a power flow diagram.
Fig. 3: the invention relates to a shutdown flow chart of a diesel generator.
Fig. 4: the invention relates to a flow chart for stopping a diesel generator to generate electricity and starting the diesel generator automatically.
Fig. 5: and (5) a whole plant week load graph in the dry period of the power plant.
Fig. 6: the factory power failure self-recovery method of the whole factory is used for recording a recovery process before use.
Fig. 7: the factory power failure self-recovery method is used for recovering the process record chart.
Detailed Description
Referring to fig. 1, the invention collects three-phase line voltages of bus sections I, II and III of 10kV factory power, and sends relevant signals of the diesel generator to a public LCU programmable logic controller of a monitoring system through quality judgment, and the invention compiles a factory power failure self-recovery flow, a state criterion of the diesel generator, a starting condition criterion and a three-section start-stop flow of the whole factory power, so as to realize a quick self-recovery function after the whole factory power failure.
Referring to fig. 2-4, the judgment and control flow is:
and (3) starting a power-off self-recovery flow: and when 9 total bus voltages of the section I, the section II and the section III of the 10kV factory power supply are normal in collection state and are smaller than 10% rated voltage, judging that the factory power supply of the whole factory is lost, and starting the process automatically. The judgment basis is as follows:
(public 10kV I section line voltage Uab <10%ue and good quality of measurement points) and (public 10kV I section line voltage Ubc <10%ue and good quality of measurement points) and (public 10kV I section line voltage Uca <10%ue and good quality of measurement points) and (public 10kV II section line voltage Uab <10%ue and good quality of measurement points) and (public 10kV II section line voltage Ubc <10%ue and good quality of measurement points) and (public 10kV II section line voltage Uca <10%ue and good quality of measurement points) and (public 10kV III section line voltage Uab <10%ue and good quality of measurement points) and (public 10kV III section line voltage Uca <10%ue and good quality of measurement points).
"stop-no load" flow: starting the flow, judging that the outlet breaker of the diesel generator is in the split position, judging that the starting condition of the diesel generator is met, starting the diesel generator, judging that the diesel generator is in an idle state when the diesel generator is started, and ending the flow when the diesel generator is limited for 60 s.
An "no-load-power" flow: the method comprises the steps of starting a flow, checking that station service electricity is lost, judging that a diesel generator is in an idle state, disconnecting a 10kV station service I-section bus incoming line breaker, a contact breaker and a feeder breaker, judging that the 10kV station service I-section bus incoming line breaker and the contact breaker are all disconnected in time-limited 10s, opening and closing a switch to a diesel generator outlet breaker, checking that an outlet breaker is closed in time-limited 10s, judging that the diesel generator is in a power generation state, and ending the flow.
"shutdown-Power Generation" flow: the method comprises the steps of starting a flow, judging that an outlet circuit breaker of a diesel generator is in a split position, judging that a starting condition of the diesel generator is met, starting a starting command to the diesel generator, judging that the diesel generator is in an idle state in a time limit of 60s, checking that station service electricity is lost, judging that the diesel generator is in the idle state, disconnecting a 10kV station service electricity I-section bus inlet circuit breaker, a connecting circuit breaker, a feeder circuit breaker, judging that the 10kV station service electricity I-section bus inlet circuit breaker and the connecting circuit breaker are all disconnected in a time limit of 10s, opening a closing command to the outlet circuit breaker of the diesel generator, checking that three phases of the outlet circuit breaker are closed in the time limit of 10s, judging that the diesel generator is in a power generation state, and ending the flow.
The "shutdown" flow: starting the flow, judging that the outlet breaker of the diesel generator is in a split state, starting and stopping the diesel generator, judging that the diesel generator is in a stop state when the time is limited for 120s, and ending the flow.
The process of 'whole plant power failure self-starting' comprises the following steps: the method comprises the steps of losing power of the whole plant, delaying for 2s, starting a process, judging that an outlet breaker of a diesel generator is in a split position, judging that a starting condition of the diesel generator is met, starting a starting command to the diesel generator, judging that the diesel generator is in an idle state in time limit 60s, checking that the power of the whole plant is lost, judging that the diesel generator is in the idle state, disconnecting a 10kV plant power I-section bus inlet breaker, a contact breaker and a feeder breaker, judging that the 10kV plant power I-section bus inlet breaker and the contact breaker are all disconnected in time limit 10s, opening a closing command to the outlet breaker of the diesel generator, checking that three phases of the outlet breaker are closed in time limit 10s, judging that the diesel generator is in a power generation state, and ending the process.
Aiming at the diesel generator, the invention simultaneously sets the functions of one-key rotation no-load, power generation and stop of the monitoring upper computer operator station, and can develop the test of periodically and remotely starting the diesel generator and stop the operation of the diesel generator after the black start of the unit is finished.
As shown in fig. 6 and 7, after the technology is developed and used by the SH secondary hydropower station, the accident handling and recovery time after the power loss of the station service of the whole plant is shortened, and the generated energy is improved.
After the whole plant power-loss self-recovery method is used, the total treatment time of whole plant power-loss accidents is shortened from 1 hour and 28 minutes to 28 minutes, and the accident treatment speed is improved by three times (wherein the whole plant power-loss self-recovery time is only 1 minute, and is improved by 16 times compared with the manual operation time by 16 minutes). When the power station is required to restore power supply in the case of power grid faults, the economic benefit for power supply to the power grid is restored 1 hour in advance, and the electric quantity loss of 1.2 kilowatt-hours can be restored according to the calculation of the lowest load 12MW of the machine set in the dead water period, which is equivalent to 0.6 kilowatt-hour of RMB, and the electric quantity loss of 40 kilowatt-hours can be restored under the condition that the machine set in the full water period is full, which is equivalent to 20 kilo-hour of RMB.
The implementation of the invention has the following effects:
(1) Improving the reliability of the station service
Through experiments, after the accident of station service power failure occurs, the accident signal is monitored from the device, and the whole process only needs 1 minute from the time when the station service power operation of the diesel generator is completed. Compared with the traditional self-recovery mode of the station service electricity, the time is greatly shortened, and the reliability of the station service electricity is obviously improved.
(2) Direct economic benefits
The power grid is weak, 2 units are usually operated at least in a power plant without external power supply, so that the station power is not completely lost due to primary faults, and only 1 unit is started to operate with the station power in the low-valley stage of the power plant, so that the self-power of the units is saved, and the water energy utilization rate is improved.
As can be seen from fig. 5, the low load period of the power plant is mainly concentrated in the dead water period (about 6 months) from 23:00 night to 7:00 next day and the Saturday, sunday, holiday (estimated here as 80%) and is adjusted to be 2064 hours in total of the whole year of the running time of the single unit.
The conservation estimation saves the self-electricity load of a single unit by about 88.75 kilowatts per year, and the energy utilization rate (during the operation of the single unit) is improved by 20%, the generated energy is reduced by 412.8 kilowatts, and the energy consumption is reduced by 206.4 kilowatts. 250.77 ten thousand yuan is added in one year.
(3) Indirect benefit
The threat of accident shutdown of the unit under the condition of no auxiliary power supply is eliminated, the running mode of the unit is more flexible, and the unit with the station service motor can be properly stopped.
The power plant has more reliable power operation and stable power plant operation, and improves the overall external image of the power plant.
Claims (5)
1. The power failure self-recovery method for the whole factory of the factory power under the weak power network without the external power supply is characterized by comprising the following steps of:
step S1, collecting relevant signals of 10kV station service electricity and a diesel generator;
step S2, a power-off self-recovery flow starting source: when the voltages of the buses of sections I, II and III of the 10kV factory power supply are smaller than 10% of rated voltage and the quality of the measured points is good, judging that the factory power supply is lost, and starting the process automatically;
step S3, "stop-no load" flow: starting a flow, judging that an outlet breaker of the diesel generator is in a split state, judging that the starting condition of the diesel generator is met, starting the diesel generator, judging that the diesel generator is in an idle state when the diesel generator is started, and ending the flow when the diesel generator is limited for 60 s;
step S4, "no-load-power generation" flow: the method comprises the steps of starting a flow, checking that station service electricity is lost, judging that a diesel generator is in an idle state, disconnecting a 10kV station service I-section bus incoming line breaker, a contact breaker and a feeder breaker, judging that the 10kV station service I-section bus incoming line breaker and the contact breaker are all disconnected in time-limited 10s, opening and closing a switch to a diesel generator outlet breaker, checking that an outlet breaker is closed in time-limited 10s, judging that the diesel generator is in a power generation state, and ending the flow;
step S5, "shutdown-power generation" process: starting a flow, judging that an outlet circuit breaker of a diesel generator is in a split position, judging that a starting condition of the diesel generator is met, starting the diesel generator until the diesel generator is started, judging that the diesel generator is in an idle state when the diesel generator is in a time limit of 60s, checking that station service electricity is lost, judging that the diesel generator is in the idle state, disconnecting a 10kV station service electricity I-section bus inlet circuit breaker, a contact circuit breaker and a feeder circuit breaker, judging that the 10kV station service electricity I-section bus inlet circuit breaker and the contact circuit breaker are all disconnected when the time limit of 10s is included, starting the switching on until the diesel generator is started, checking that three phases of the outlet circuit breaker are switched on when the time limit of 10s is included, checking that the diesel generator is in a power generation state, and ending the flow;
step S6, "shutdown" flow: starting a flow, judging that an outlet breaker of the diesel generator is in a split state, starting and stopping the diesel generator, judging that the diesel generator is in a stop state when the diesel generator is in a time limit for 120s, and ending the flow;
step S7, a process of 'power failure and self-starting of factory service' is as follows: the method comprises the steps of losing power of the whole plant, delaying for 2s, starting a process, judging that an outlet breaker of a diesel generator is in a split position, judging that a starting condition of the diesel generator is met, starting a starting command to the diesel generator, judging that the diesel generator is in an idle state in time limit 60s, checking that the power of the whole plant is lost, judging that the diesel generator is in the idle state, disconnecting a 10kV plant power I-section bus inlet breaker, a contact breaker and a feeder breaker, judging that the 10kV plant power I-section bus inlet breaker and the contact breaker are all disconnected in time limit 10s, opening a closing command to the outlet breaker of the diesel generator, checking that three phases of the outlet breaker are closed in time limit 10s, judging that the diesel generator is in a power generation state, and ending the process.
2. The power loss self-recovery method according to claim 1, wherein:
the step S1 for collecting the three-phase line voltage of the bus of the section I, the section II and the section III of the 10kV station service electricity comprises the following steps: line voltages Uab, ubc and Uca of the public 10kV I section bus, line voltages Uab, ubc and Uca of the public 10kV II section bus, line voltages Uab, ubc and Uca of the public 10kV III section bus;
the collecting the relevant signals of the diesel generator comprises the following steps: the oil level of the oil tank of the diesel generator 1DG of the public 400V 1, the water temperature of the diesel generator 1DG of the public 400V 1, the fault of the diesel generator 1DG of the public 400V 1, the closing position of the body switch 501 of the diesel generator 1DG of the public 400V 1 and the lubricating oil pressure of the diesel generator 1DG of the public 400V 1.
3. The method for recovering power loss according to claim 1, wherein the step 2 of determining power loss of the factory service specifically includes determining:
public 10kV I section line voltage Uab <10%ue and measuring point quality is good, public 10kV I section line voltage Ubc <10%ue and measuring point quality is good, public 10kV I section line voltage Uca <10%ue and measuring point quality is good, public 10kV II section line voltage Uab <10%ue and measuring point quality is good, public 10kV II section line voltage Ubc <10%ue and measuring point quality is good, public 10kV II section line voltage Uca <10%ue and measuring point quality is good, public 10kV III section line voltage Uab <10%ue and measuring point quality is good, public 10kV III section line voltage Ubc <10%ue and measuring point quality is good, and public 10kV III section line voltage Uca <10%ue and measuring point quality is good.
4. A method for recovering from power loss according to any one of claims 1 to 3, wherein the determination in step S2 is based on:
(1) A "shutdown state" criterion: the outlet voltage is less than 10% of rated voltage and the outlet breaker is split;
(2) An "empty state" criterion: the outlet voltage is greater than 85% of rated voltage and the outlet breaker is split;
(3) "Power generation" criteria: the outlet voltage is greater than 85% of rated voltage and the outlet breaker is in position.
5. The method for recovering from power loss according to claim 4, wherein the step S6 of determining that the diesel generator outlet breaker is in the split position comprises:
if the circuit breaker is in the on position, opening the off gate to the circuit breaker, and judging that the circuit breaker is in the off position within 10s of time limit.
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| CN113685237B (en) * | 2021-08-26 | 2024-02-23 | 四川明星电力股份有限公司 | Rapid starting system and one-key rapid starting method for generator set under fault condition |
| CN116565961B (en) * | 2023-07-07 | 2023-09-08 | 华能澜沧江水电股份有限公司 | One-key starting control method and system for diesel generator with station service bus of hydropower station |
| CN117293999A (en) * | 2023-09-25 | 2023-12-26 | 云南储能有限公司 | Factory electricity recovery control method and device based on diesel generator |
| CN117293998B (en) * | 2023-09-25 | 2024-04-19 | 云南储能有限公司 | Station service electricity recovery control method and device based on generator set |
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| CN106356892A (en) * | 2016-10-14 | 2017-01-25 | 易事特集团股份有限公司 | Microgrid black-start method |
| CN108448634A (en) * | 2018-04-28 | 2018-08-24 | 乌江渡发电厂 | A kind of long-range key black starting-up control method of Hydropower Unit |
| CN111628567A (en) * | 2020-06-26 | 2020-09-04 | 西安热工研究院有限公司 | Diesel generator system giving consideration to accident security and black start and starting method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106356892A (en) * | 2016-10-14 | 2017-01-25 | 易事特集团股份有限公司 | Microgrid black-start method |
| CN108448634A (en) * | 2018-04-28 | 2018-08-24 | 乌江渡发电厂 | A kind of long-range key black starting-up control method of Hydropower Unit |
| CN111628567A (en) * | 2020-06-26 | 2020-09-04 | 西安热工研究院有限公司 | Diesel generator system giving consideration to accident security and black start and starting method |
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