CN111049258A - Automatic switching control method for standby power supply - Google Patents
Automatic switching control method for standby power supply Download PDFInfo
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- CN111049258A CN111049258A CN202010008484.XA CN202010008484A CN111049258A CN 111049258 A CN111049258 A CN 111049258A CN 202010008484 A CN202010008484 A CN 202010008484A CN 111049258 A CN111049258 A CN 111049258A
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Safety Devices In Control Systems (AREA)
Abstract
The invention discloses an automatic switching control method for a standby power supply, and belongs to the technical field of hydraulic power generation dispatching control. The control method is carried out based on the conventional power grid structure of the factory power, and the power grid structure of the factory power consists of VII, VIII and IX section three-section buses, corresponding power incoming lines, a power incoming line switch, a tie line and a tie switch. The method comprises the specific steps that the standby switch capable of being automatically switched is connected to a connecting line, all switches are connected with a PLC (programmable logic controller), the PLC periodically scans all switch states, and the PLC judges whether the standby switch capable of being automatically switched needs to be started according to all the switch states. The method can realize the electric locking and standby automatic switching control functions of each circuit switch of the service power, and switch and start the standby power supply of the service power in time, thereby ensuring the safe and stable operation of power production.
Description
Technical Field
The invention relates to the technical field of hydroelectric power generation dispatching control, in particular to a standby power supply switching control method for a hydroelectric power plant generator set.
Background
Currently, VII, VIII and IX sections of a 400V station power public power part of a hydraulic power plant are independently operated under normal conditions, and corresponding interconnection switches are all at the position of a separating brake. When the generator set is in an unconventional operation condition, namely when the VIII section loses power, the VII section is usually used as a standby power supply firstly, and then the IX section is used as a secondary standby power supply. At this time, to ensure safety, it is required that the vii section prohibit carrying of the load of the ix section through the viii section, and the same ix section prohibits carrying of the load of the vii section through the viii section. The standby power supply realizes the function of automatically putting the standby power supply into production through the standby automatic switching of the corresponding interconnection switch under the condition that the main power supply loses power.
The service power supply of the existing three incoming lines respectively supplies power to three sections of buses, and a load of a plurality of important service power generation auxiliary equipment such as an air compressor, a leakage draining pump, a maintenance power box, a refrigeration station, a bridge crane, a power distribution room and the like is arranged below each section of bus. Because the auxiliary equipment has large load and the working current is different from dozens of ampere times to hundreds of ampere times, the reliable switching between the standby power supplies is met, and the power production safety accident that the equipment is damaged because two different power supplies supply power to one section of bus at the same time is prevented. However, in the existing control method for automatically switching the auxiliary power standby power supply of the hydroelectric power plant, the switching cannot be performed in time only by manually operating the interconnection switch on the basis of the laggard simple hard-wired locking.
Disclosure of Invention
In order to solve one or more problems in the background art, the invention provides an automatic switching control method of a standby power supply, which can automatically control a power supply of 400V of station service power, and adds a corresponding PLC (programmable logic controller) logic control method on the basis of the existing simple hard-wired locking to realize the functions of electric locking and automatic standby switching control.
The specific technical scheme is as follows:
a standby power supply automatic switching control method is based on a power grid structure for carrying out the existing service power, wherein the service power grid structure consists of VII, VIII and IX section loads and corresponding power incoming lines, a power incoming line switch, a tie line and a tie switch; the method comprises the following steps:
s1, respectively setting a VII-VIII section interconnection switch and a VIII-IX section interconnection switch of the existing station power for standby by automatic switching-in changeover switches;
s2, a VII-section power supply incoming line switch, VII-VIII-section interconnection switches, a VIII-section power supply incoming line switch, VIII-IX-section interconnection switches, IX-section power supply incoming line switches and the two automatic switching switches in the step S1 of the station power supply are respectively and electrically connected with the PLC;
s3, the PLC carries out periodic scanning on the closing/opening states of the five switches in the step S2 and then executes the next step S4;
s4, judging whether the automatic input changeover switch needs to be put into use or not by the PLC according to the received closing/opening states of the five switches; if so, the PLC drives the corresponding automatic switching-in selector switch to access the corresponding standby power supply; if not, the process returns to step S3 to wait for the next scanning cycle.
Further, in step S2, each switch is electrically connected to a serial port pin of the PLC programmable controller.
Further, in step S3, the time interval of the periodic scanning is set by a timer of the PLC programmable controller.
Further, in step S3, the PLC programmable controller sets a start delay of 2000 ms when periodically scanning the opening/closing state of each switch.
Further, if the opening/closing state of the switch remains unchanged in the set start-up delay of 2000 milliseconds, it indicates that the switch state is normal, and then step S4 is executed; if the opening/closing state of the switch fluctuates in the set delay time of 2000 milliseconds, it indicates that the switch has a fault, and then the periodic scanning of step S3 is executed again.
Further, in step S4, when the house service is in a normal power generation state, the vii, viii and ix section power line switches are all in the on-position, and the tie switches are all in the off-position, so the more specific condition for determining whether the corresponding automatic input transfer switch needs to be switched to the on-position in step S4 is:
s41, when the VII-section power incoming line switch is in a switching-on state and the VIII-section and IX-section power incoming line switches are in a switching-off state, indicating that the VIII-section and IX-section are in a power failure state, driving the VII-VIII-section connection switches to be switched on at the moment by the PLC, and connecting the VIII-IX-section connection switches to be switched off;
s42, when the incoming line switch of the VIII section power supply is in a switching-on state, and the incoming line switches of the VII section power supply and the IX section power supply are in a switching-off state, indicating that the VII section power supply and the IX section power supply are in a power-off state, and driving one of the VII-VIII section interconnection switch or the VIII-IX section interconnection switch to be switched on and the other to be switched off by the PLC at the moment;
s43, when the power incoming line switch of the section IX is in switching-on and the power incoming line switches of the sections VII and VIII are in switching-off, indicating that the sections VII and VIII are in power failure, driving the section VII-VIII connection switch switching-off and the section VIII-IX connection switch switching-on by the PLC at the moment;
s44, when the VII-VIII section power supply inlet wire switches are switched on and the IX-IX section power supply inlet wire switches are switched off, indicating that the IX section is de-energized, driving the VII-VIII section interconnection switches to be switched off by the PLC at the moment, and switching on the VIII-IX section interconnection switches;
s45, when the VII-IX section power incoming line switches are switched on and the VIII-section power incoming line switches are switched off, indicating that the VIII section is power-off, driving one of the VII-VIII section interconnection switches or the VIII-IX section interconnection switches to be switched on and the other to be switched off by the PLC at the moment;
and S46, when the IX and VIII section power supply inlet switches are in switching-on and the VII section power supply inlet switch is in switching-off, indicating that the VII section is in power failure, driving the VII-VIII section interconnection switches to switch on by the PLC at the moment, and connecting the VIII-IX section interconnection switches to switch off.
Furthermore, the method is automatically controlled by a computer program arranged in a storage unit of the PLC through calling a logic control unit of the PLC by using a level signal of a serial port pin.
Compared with the existing hard-wired and simple electrical control mode for switching the backup power supply of the station power supply of the hydraulic power plant, the automatic switching control method of the backup power supply has the advantages that:
the automatic control of the whole process is realized by utilizing automatic electrical equipment (a PLC programmable controller) in the mode of manually switching the standby power supply by the original hard wiring. And the idea of carrying out effective electrical control locking on the incoming line switch and the interconnection switch is utilized to control the switching operation within a limited condition and time interval according to the conditions of switch faults such as misoperation, refusal action and the like possibly generated in the automatic switching control of the standby power supply, so that the safety, timeliness and reliability of the switching control process of the whole standby power supply for service are improved, and the safety and stability of power production are ensured.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a single line diagram of a circuit configuration of the service power system corresponding to the method of fig. 1.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent. Certain features or steps of the drawings may be omitted, enlarged or reduced to better illustrate the embodiments, and are not intended to represent the size or composition of the actual product or method. It will be understood by those skilled in the art that certain well-known structures or steps in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Referring to fig. 2, the basic method of the present invention, the circuit structure of the existing plant system, is shown in a single line diagram. The three sections VII, VIII and IX with loads are respectively marked as 7DCM, 8DCM and 9DCM, and incoming switches on the power incoming line of each service power are also sequentially marked as 7ZKK _ Q1, 8ZKK _ Q1 and 9ZKK _ Q1. On the tie lines between 7DCM and 8DCM, 8DCM and 9DCM, the tie switches are labeled 17ZKK _ Q1 and 18ZKK _ Q1, respectively, in order.
The automatic switching control method of the standby power supply comprises the following specific steps:
in the first step, a tie switch 17ZKK _ Q1 between 7DCM and 8DCM, and a tie switch 18ZKK _ Q1 between 8DCM and 9DCM are set as automatic-on changeover switches; this type of switch has an automatic control mode of 17ZKK _ Q1_ AUTO, 18ZKK _ Q1_ AUTO and a MANUAL operation mode MANUAL _ AUTO, but the following steps will make this type of switch operate in automatic control mode.
And secondly, serial port pins of the PLC are respectively connected with 7ZKK _ Q1, 8ZKK _ Q1, 9ZKK _ Q1, 17ZKK _ Q1 and 18ZKK _ Q1, so that a level signal transceiving function with the PLC is realized.
And thirdly, a control program arranged in a storage unit in the PLC controls a self-contained timer by calling a logic control unit, and sets a serial port pin scanning period and a 2000-millisecond starting delay.
Fourthly, when the scanning period set in the third step arrives, the PLC programmable controller judges the corresponding opening/closing state of each switch according to the level signal change for the corresponding 7ZKK _ Q1, 8ZKK _ Q1, 9ZKK _ Q1, 17ZKK _ Q1 and 18ZKK _ Q1 on each serial port pin. When the PLC receives the level signal change generated by the conversion of the corresponding switch state, the PLC judges whether the changed signal is normal or not by using the 2000 millisecond starting delay set in the third step; if the level signal is not changed in the starting time delay, the corresponding switch is not in fault, and then the fifth step is executed; if not, the corresponding switch is indicated to have a fault, and then the step is repeated.
Fifthly, judging whether the 7DCM, the 8DCM and the 9DCM are in a power-off state or not by the PLC according to the analysis of the states of the switches; if yes, starting 17ZKK _ Q1 or 18ZKK _ Q1 correspondingly; if not, returning to the fourth step to wait for the next scanning period;
under the condition that the plant power pair is used for normally supplying power for 7DCM, 8DCM and 9DCM, 17ZKK _ Q1 and 18ZKK _ Q1 are both in the switching-off position, so the condition of more specifically judging whether 17ZKK _ Q1 or 18ZKK _ Q1 needs to be switched on or not is as follows:
firstly, when 7ZKK _ Q1 is switched on, 8ZKK _ Q1 and 9ZKK _ Q1 are switched off, the situation that 7DCM is electrified and 8DCM and 9DCM are not electrified is shown, at the moment, the PLC drives 17ZKK _ Q1 to be switched on but 18ZKK _ Q1 to be switched off, and the 7DCM only carries the load of 8 DCM;
when 9ZKK _ Q1 is switched on, and 7ZKK _ Q1 and 8ZKK _ Q1 are switched off, the situation that 9DCM is electrified and 7DCM and 8DCM are not electrified is shown, and at the moment, the PLC drives 18ZKK _ Q1 to be switched on but 17ZKK _ Q1 to be switched off, and the 9DCM only carries the load of 8 DCM;
thirdly, when 8ZKK _ Q1 is switched on, 7ZKK _ Q1 and 9ZKK _ Q1 are switched off, which indicates that 8DCM is electrified and 7DCM and 9DCM are not electrified, the PLC programmable controller drives one of 17ZKK _ Q1 or 18ZKK _ Q1 to be switched on and the other to be switched off, 8DCM carries the load of 7DCM or 9DCM, and 8DCM cannot carry the load of 7DCM and 9DCM at the same time;
fourthly, when 7ZKK _ Q1 and 8ZKK _ Q1 are simultaneously switched on and 9ZKK _ Q1 is switched off, the 9DCM is powered off, at the moment, the PLC drives 17ZKK _ Q1 to be switched off and 18ZKK _ Q1 to be switched on, and 8DCM carries the load of 9 DCM;
fifthly, when 7ZKK _ Q1 and 9ZKK _ Q1 are simultaneously switched on and 8ZKK _ Q1 is switched off, the 8DCM is powered off, and at the moment, the PLC drives one of 17ZKK _ Q1 or 18ZKK _ Q1 to be switched on and the other to be switched off, so that the 7DCM or the 9DCM carries the load of the 8 DCM;
sixthly, when 8ZKK _ Q1 and 9ZKK _ Q1 are simultaneously switched on and 7ZKK _ Q1 is switched off, the 7DCM loses power, at the moment, the PLC drives 17ZKK _ Q1 to be switched on and 18ZKK _ Q1 to be switched off, and 8DCM carries the load of 7 DCM.
In order to make a determination more quickly, a truth table corresponding to each switching state is stored in a storage unit in the PLC programmable controller for the logic control unit to query, which is specifically shown in table 1 below:
| 7ZZK_Q1 | 8ZZK_Q1 | 9ZKK_Q1 | 18ZKK_Q1 | 17ZKK_Q1 | switching states |
| 0 | 0 | 0 | 0 | 0 | Is absent from |
| 0 | 0 | 0 | 1 | 0 | Is absent from |
| 0 | 0 | 1 | 0 | 0 | Not switching |
| 0 | 0 | 1 | 1 | 0 | Switched |
| 0 | 1 | 0 | 0 | 1 | Switched |
| 0 | 1 | 0 | 1 | 1 | Has already been cut in |
| 0 | 1 | 1 | 0 | 1 | Switched |
| 0 | 1 | 1 | 1 | 0 | Is absent from |
| 1 | 0 | 0 | 0 | 1 | Switched |
| 1 | 0 | 0 | 1 | 0 | Is absent from |
| 1 | 0 | 1 | 0 | 1 | Switched |
| 1 | 0 | 1 | 1 | 0 | Switched |
| 1 | 1 | 0 | 0 | 0 | Not switching |
| 1 | 1 | 0 | 1 | 0 | Switched |
| 1 | 1 | 1 | 0 | 0 | Normal power-on |
| 1 | 1 | 1 | 1 | 0 | Is absent from |
TABLE 1 truth table of each switch (0 for open and 1 for close)
By using the automatic switching control method of the standby power supply, the automatic control of the whole process is realized by using automatic electrical equipment in the original mode that the standby power supply is switched by manual operation through hard wiring. The time delay is set according to the conditions of switch faults such as misoperation, refusal and the like possibly generated in automatic switching control of the standby power supply, and the switching operation is controlled in a limited condition and time period by utilizing the idea of carrying out effective electrical control locking on the incoming line switch and the interconnection switch, so that the safety, timeliness and reliability of the switching control process of the whole auxiliary standby power supply are improved, the fault recovery capability and safety of the auxiliary power supply are ensured, and the stability degree of power production is further improved.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (7)
1. A standby power supply automatic switching control method is based on the existing power grid structure of the service power, and the service power grid structure consists of VII, VIII and IX section loads and corresponding power incoming lines, a power incoming line switch, a tie line and a tie switch; characterized in that the method comprises the following steps:
s1, respectively setting a VII-VIII section interconnection switch and a VIII-IX section interconnection switch of the existing station power for standby by automatic switching-in changeover switches;
s2, a VII-section power supply incoming line switch, VII-VIII-section interconnection switches, a VIII-section power supply incoming line switch, VIII-IX-section interconnection switches, IX-section power supply incoming line switches and the two automatic switching switches in the step S1 of the station power supply are respectively and electrically connected with the PLC;
s3, the PLC carries out periodic scanning on the closing/opening states of the five switches in the step S2 and then executes the next step S4;
s4, judging whether the automatic input changeover switch needs to be put into use or not by the PLC according to the received closing/opening states of the five switches; if so, the PLC drives the corresponding automatic switching-in selector switch to access the corresponding standby power supply; if not, the process returns to step S3 to wait for the next scanning cycle.
2. The automatic switching control method of the backup power supply according to claim 1, wherein: in step S2, the switches are electrically connected to the serial pins of the PLC.
3. The automatic switching control method of the backup power supply according to claim 1, wherein: in step S3, the time interval of the periodic scanning is set by a timer of the PLC programmable controller.
4. The automatic switching control method of the backup power supply according to claim 1, wherein: in step S3, the PLC programmable controller sets a start delay of 2000 ms when periodically scanning the opening/closing state of each switch.
5. The automatic switching control method of the backup power supply according to claim 4, wherein: if the opening/closing state of the switch is kept unchanged in the set 2000 millisecond delay starting, the switch state is normal, and then the step S4 is executed; if the opening/closing state of the switch fluctuates in the set 2000 ms delay start, it indicates that the switch state is faulty, and then the periodic scanning of step S3 is executed again.
6. The method as claimed in claim 1, wherein in step S4, when the service power is in a normal power supply state, the incoming power switches are all in the on position and the interconnection switches are all in the off position, so the condition for more specifically determining whether the corresponding automatic input transfer switch needs to be switched to the on position in step S4 is:
s41, when the VII-section power incoming line switch is in a switching-on state and the VIII-section and IX-section power incoming line switches are in a switching-off state, indicating that the VIII-section and IX-section are in a power failure state, driving the VII-VIII-section connection switches to be switched on at the moment by the PLC, and connecting the VIII-IX-section connection switches to be switched off;
s42, when the incoming line switch of the VIII section power supply is in a switching-on state, and the incoming line switches of the VII section power supply and the IX section power supply are in a switching-off state, indicating that the VII section power supply and the IX section power supply are in a power-off state, and driving one of the VII-VIII section interconnection switch or the VIII-IX section interconnection switch to be switched on and the other to be switched off by the PLC at the moment;
s43, when the power incoming line switch of the section IX is in switching-on and the power incoming line switches of the sections VII and VIII are in switching-off, indicating that the sections VII and VIII are in power failure, driving the section VII-VIII connection switch switching-off and the section VIII-IX connection switch switching-on by the PLC at the moment;
s44, when the VII-VIII section power supply inlet wire switches are switched on and the IX-IX section power supply inlet wire switches are switched off, indicating that the IX section is de-energized, driving the VII-VIII section interconnection switches to be switched off by the PLC at the moment, and switching on the VIII-IX section interconnection switches;
s45, when the VII-IX section power incoming line switches are switched on and the VIII-section power incoming line switches are switched off, indicating that the VIII section is power-off, driving one of the VII-VIII section interconnection switches or the VIII-IX section interconnection switches to be switched on and the other to be switched off by the PLC at the moment;
and S46, when the IX and VIII section power supply inlet switches are in switching-on and the VII section power supply inlet switch is in switching-off, indicating that the VII section is in power failure, driving the VII-VIII section interconnection switches to switch on by the PLC at the moment, and connecting the VIII-IX section interconnection switches to switch off.
7. The automatic switching control method of the backup power supply according to claims 1 to 6, characterized in that: the method is characterized in that a computer program arranged in a storage unit of the PLC is used for calling a logic control unit of the PLC to automatically control by using a level signal of a serial port pin.
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- 2020-01-06 CN CN202010008484.XA patent/CN111049258A/en active Pending
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| CN201570896U (en) * | 2009-12-09 | 2010-09-01 | 武汉钢铁(集团)公司 | PLC-implemented three-way power source three-section bus independent operation BZT sectioning device |
| CN107591796A (en) * | 2016-07-08 | 2018-01-16 | 宁波天安集团开关有限公司 | The three inlet wires two contact electrical interlocking system of distribution system |
| CN108448570A (en) * | 2018-03-14 | 2018-08-24 | 中国石油化工集团公司 | A kind of enterprise of power plant for self-supply Substation Optimization method reducing system reserve capacity |
| KR20190110256A (en) * | 2018-03-20 | 2019-09-30 | 주식회사블루웨이 | Remote monitoring system using multi-routes communication device based on sk-platform database |
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| 徐炜君等主编: "《电气控制与PLCA技术》", 30 April 2014 * |
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Application publication date: 20200421 |
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