CN107591896B - Safety bus power supply monitoring system of thermal power plant - Google Patents
Safety bus power supply monitoring system of thermal power plant Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims description 75
- 238000010248 power generation Methods 0.000 claims description 118
- 238000000034 method Methods 0.000 claims description 29
- 230000001360 synchronised effect Effects 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 26
- 238000001514 detection method Methods 0.000 claims description 19
- 238000005259 measurement Methods 0.000 claims description 15
- 238000012806 monitoring device Methods 0.000 claims description 15
- 230000010365 information processing Effects 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 claims description 2
- 230000000875 corresponding effect Effects 0.000 description 18
- 230000002159 abnormal effect Effects 0.000 description 12
- 238000012360 testing method Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 239000000498 cooling water Substances 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 5
- 239000010705 motor oil Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000003993 interaction Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000007474 system interaction Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- 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
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
- Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
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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
- Y04S20/248—UPS systems or standby or emergency generators
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Abstract
The invention can monitor and control the operation of the generator set, control the safe switching of the generator set, and simultaneously control the orderly switching of the main working power supply, the standby working power supply and the emergency power supply of the safety section.
Description
Technical Field
The invention relates to a monitoring system, in particular to a safety bus power supply monitoring system of a thermal power plant.
Background
As known, during the operation or the shutdown of a turbo generator set in a thermal power plant, when a whole plant power failure occurs or the turbo generator set loses station power, serious accidents such as personal safety, main equipment damage, or important automatic control equipment failure can occur or endanger, and an ac security bus section is required to continuously supply power to a security load.
The safety bus section has important position in the power system, and can ensure the safe shutdown of the turbo generator set, the quick restarting after the accident elimination, and the like.
The safety bus power supply monitoring system of the thermal power plant is used as a core of monitoring, controlling, protecting and program-controlled management of power supply of a safety section, can monitor and control the operation of the power generator, control the safety switching of the power generator, and simultaneously control the orderly switching of a main working power supply, a standby working power supply and an emergency power supply of the safety section, and has the function of improving the comprehensive stability and the safety of the power supply of the safety bus section, so that the development of the safety bus power supply monitoring system of the thermal power plant becomes a necessary technical requirement of a person skilled in the art.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention provides a safety bus power supply monitoring system of a thermal power plant, which can monitor and control the operation of a generator set, control the safe switching of the generator set, and simultaneously control the orderly switching of a main working power supply, a standby working power supply and an emergency power supply of a safety section, and has the function of improving the comprehensive stability and safety of the safety bus section power supply.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the utility model provides a thermal power factory safety bus power supply monitored control system, includes power generation outgoing line cabinet, feeder cabinet and program control cabinet, power generation outgoing line cabinet is equipped with power generation outgoing line circuit breaker, basic monitored control system and power generation monitored control system respectively, be equipped with power generation feeder circuit breaker and circuit breaker protection system in the feeder cabinet respectively, be equipped with program control management system in the program control cabinet, basic monitored control system connects generating set, start-up battery, thermal power plant DCS system, power generation monitored control system and program control management system respectively, power generation monitored control system connects power generation outgoing line circuit breaker, generating set, thermal power plant DCS system, program control managed system and circuit breaker protection system respectively, program control management system connects safety bus section main operating power supply and inlet wire circuit breaker, safety bus section reserve operating power supply and inlet wire circuit breaker, safety bus section, thermal power plant DCS system, power generation monitored control system, basic monitored control system and circuit breaker protection system respectively, power generation outgoing line circuit breaker, power generation feeder circuit breaker protection system, power generation monitored control system, program control system and thermal power plant DCS system.
The basic monitoring system comprises a programmable controller, a safety protection unit, an emergency control unit and a parameter display unit, wherein the programmable controller is respectively connected with the control element, the safety protection unit, the emergency control unit, the parameter display unit, an engine sensing device, an engine execution device, a comprehensive protection measurement and control unit of a power generation monitoring system, a power generation line breaker, a programmable controller of a program control management system and a DCS (distributed control system) of a thermal power plant, the safety protection unit is respectively connected with the control element, the engine sensing device, the engine execution device and the programmable controller, and the emergency control unit is respectively connected with the emergency control element, the engine execution device and the programmable controller.
The power generation monitoring system comprises a comprehensive protection measurement and control unit and an electric quantity acquisition unit, wherein the comprehensive protection measurement and control unit is respectively connected with a control element, the electric quantity acquisition unit, a programmable controller of a basic monitoring system, a power generation outlet circuit breaker and a thermal power plant DCS monitoring system.
The system comprises a thermal power plant safety bus power supply monitoring system, wherein the program-controlled management system comprises a programmable controller, an electric quantity detection unit, a synchronous control unit and a parameter display unit, the programmable controller is respectively connected with the electric quantity detection unit, the synchronous control unit, the parameter display unit, a control element, a power generation outgoing line breaker, a power generation feeder line breaker, a safety bus main working power supply incoming line breaker, a safety bus standby working power supply incoming line breaker, a basic monitoring system programmable controller, a circuit breaker protection system PC monitoring device and a thermal power plant DCS monitoring system, the electric quantity detection unit is respectively connected with a safety bus, a safety bus main working power supply, a safety bus standby working power supply and the program-controlled management system programmable controller, and the synchronous control unit is respectively connected with a power generation, a safety bus main working power supply, a bus standby working power supply and the program-controlled management system programmable controller.
The circuit breaker protection system comprises a control element, a PC monitoring device and an information processing unit, wherein the PC monitoring device is respectively connected with the control element, the power generation outgoing line circuit breaker, the power generation feeder circuit breaker, the programmable controller of the program control management system, the information processing unit and the DCS monitoring system of the thermal power plant.
By adopting the technical scheme, the invention has the following advantages:
the invention can monitor and control the operation of the generator set, control the safe switching of the generator set, and simultaneously control the orderly switching of the main working power supply, the standby working power supply and the emergency power supply of the security section, has the function of improving the comprehensive stability and the safety of the power supply of the security bus section, has the characteristics of simple structure, convenient operation and the like, and is suitable for popularization and application in a large range.
Drawings
FIG. 1 is a schematic diagram of the components of a security bus power supply monitoring system of the present invention;
FIG. 2 is a schematic diagram of the basic monitoring system of the present invention;
FIG. 3 is a schematic diagram of the power generation monitoring system of the present invention;
FIG. 4 is a schematic diagram of the components of the remote control management system according to the present invention;
fig. 5 is a schematic diagram of the circuit breaker protection system of the present invention;
FIG. 6 is a flow chart of an emergency start execution in the present invention;
FIG. 7 is an illustration of an operational mode in the present invention;
FIG. 8 is a flow chart of switching between active and standby operating power sources in the present invention;
FIG. 9 is a flow chart of another active-standby power switching in accordance with the present invention;
fig. 10 is a view showing the collection of the operating state of the circuit breaker according to the present invention;
FIG. 11 is a flow chart of the generator set input in the present invention;
FIG. 12 is a parallel switching flow in the present invention;
FIG. 13 is a series flighting flow chart in accordance with the present invention;
FIG. 14 is a generator set shutdown flow diagram in accordance with the present invention;
FIG. 15 is a schematic diagram of the operation and failure of each security section according to the present invention;
FIG. 16 is a manual start operation flow in the present invention;
FIG. 17 is a schematic illustration of a circuit breaker coil protection design for a neutral operation in accordance with the present invention;
FIG. 18 is a test mode operational flow in accordance with the present invention;
FIG. 19 is a schematic diagram of PC measurement and control protection in the present invention.
Detailed Description
The present invention will be explained in more detail by the following examples, which are not intended to limit the scope of the invention;
the utility model provides a thermal power factory security bus power supply monitored control system, includes power generation outgoing line cabinet, feeder cabinet and program control cabinet, power generation outgoing line cabinet is equipped with power generation outgoing line circuit breaker, basic monitored control system and power generation monitored control system respectively, be equipped with power generation feeder circuit breaker and circuit breaker protection system respectively in the feeder cabinet, be equipped with program control management system in the program control cabinet, basic monitored control system connects generating set, start-up battery, thermal power plant DCS system, power generation monitored control system and program control management system respectively, power generation monitored control system connects power generation outgoing line circuit breaker, generating set, thermal power plant DCS system, program control management system and circuit breaker protection system respectively, program control management system connects security bus section main working power supply and inlet wire circuit breaker, security bus section spare working power supply and inlet wire breaker, security bus section, thermal power plant DCS system, power generation monitored control system, basic monitored control system and circuit breaker protection system respectively, power generation outgoing line circuit breaker, power generation monitored control system, program control system and thermal power plant DCS system are connected respectively.
The basic monitoring system comprises a programmable controller, a safety protection unit, an emergency control unit and a parameter display unit, wherein the programmable controller is respectively connected with the control element, the safety protection unit, the emergency control unit, the parameter display unit, an engine sensing device, an engine execution device, a comprehensive protection measurement and control unit of a power generation monitoring system, a power generation line breaker, a programmable controller of a program control management system and a DCS (distributed control system) of a thermal power plant, the safety protection unit is respectively connected with the control element, the engine sensing device, the engine execution device and the programmable controller, and the emergency control unit is respectively connected with the emergency control element, the engine execution device and the programmable controller.
The power generation monitoring system comprises a comprehensive protection measurement and control unit and an electric quantity acquisition unit, wherein the comprehensive protection measurement and control unit is respectively connected with the control element, the electric quantity acquisition unit, a programmable controller of the basic monitoring system, a power generation outlet circuit breaker and a thermal power plant DCS monitoring system.
Further, the program control management system comprises a programmable controller, an electric quantity detection unit, a synchronous control unit and a parameter display unit, wherein the programmable controller is respectively connected with the electric quantity detection unit, the synchronous control unit, the parameter display unit, a control element, a power generation outgoing line breaker, a power generation feeder line breaker, a safety bus main working power supply incoming line breaker, a safety bus standby working power supply incoming line breaker, a basic monitoring system programmable controller, a circuit breaker protection system PC monitoring device and a thermal power plant DCS monitoring system, the electric quantity detection unit is respectively connected with the safety bus, the safety bus main working power supply, the safety bus standby working power supply and the program control management system programmable controller, and the synchronous control unit is respectively connected with the power generation unit, the safety bus main working power supply, the safety bus standby working power supply and the program control management system programmable controller.
Further, the circuit breaker protection system comprises a control element, a PC monitoring device and an information processing unit, wherein the PC monitoring device is respectively connected with the control element, the power generation outgoing line circuit breaker, the power generation feeder circuit breaker, the programmable controller of the program control management system, the information processing unit and the DCS monitoring system of the thermal power plant.
The core control device of the basic monitoring system is a programmable controller, a safety protection device, an emergency control unit, a parameter display device and the like, and has the functions of starting and stopping an engine, adjusting the rotating speed, monitoring operation, alarming faults, protecting safety, controlling emergency and the like. The programmable controller collects the temperature of cooling water, the pressure of cooling water, the temperature of lubricating oil, the pressure of lubricating oil, the temperature of engine exhaust, the rotating speed of engine and the like of the engine, analyzes and processes the collected parameters, alarms when the parameters are found abnormal, and displays the parameters, fault states and the like of the engine through the display device; the programmable controller monitors the electric quantity of the storage battery in real time, controls the charging device to float and charge the storage battery, ensures that the electric quantity of the storage battery is sufficient at any time, and meets the emergency starting requirement of the generator set; the programmable controller performs information interaction with a power generation monitoring system, a program control management system and a thermal power plant DCS system through an interface device and is used for logic control, parameter display, system protection and the like; the programmable controller receives control instructions of the basic monitoring system when the program control management system is in a manual mode and a test mode, controls the engine after logic processing, and realizes an automatic control function of the engine after logic processing through information interaction with the program control management system when the program control management system is in an automatic mode; the emergency control unit can ensure that the internal equipment in the bus power supply monitoring system is abnormal, the equipment cannot be controlled according to a preset flow, and the emergency control unit is required to act when the generator set is in emergency control, such as emergency starting, emergency stopping and other emergency functions, and the emergency treatment unit can realize the emergency control of the generator set under special conditions; the safety protection device detects the abnormal state of the engine in real time, when the engine is found to have serious faults, the engine is protected, and alarm information is transmitted to the parameter display device through the programmable controller.
The core device of the power generation monitoring system is a comprehensive protection measurement and control device and an electric quantity acquisition device, and has the functions of power generation electric quantity acquisition and display, switching-on and switching-off operation of a power generation outlet circuit breaker, power generation electric quantity protection and the like. The electric quantity acquisition device converts the generated electric quantity parameters into information which can be acquired by the comprehensive protection measurement and control device, the comprehensive protection measurement and control device acquires the generated electric quantity parameters through the electric quantity acquisition device, analyzes and processes the acquired parameter information and the state information of the power generation outgoing line breaker, transmits the processed information to the display screen to realize power generation monitoring, and simultaneously combines interface information to realize linkage control of the power generation outgoing line breaker.
The invention discloses a process control management system, which comprises a Siemens programmable controller, an electric quantity detection device, a synchronization control device and a parameter display device, and has the functions of monitoring the quality and the power supply state of each power supply of a security bus, controlling the switching of main and standby working power supplies and the switching of power generation power supplies of a security section, controlling the switching-on and switching-off of the main and standby working power supply circuit breakers, the power generation outgoing circuit breakers, the power generation feeder circuit breakers and the like of the security bus. The programmable controller and the parameter display screen perform data interaction through the communication interface to realize parameter display and parameter setting; the programmable controller receives information transmitted by the basic monitoring system, the generator monitoring system and the breaker protection system, and after internal logic processing, the programmable controller transmits an execution instruction, state information and the like to the basic monitoring system, the generator monitoring system and the breaker protection system, and simultaneously displays the working state of the safety bus power supply system on the display screen; the electric quantity detection device detects the power quality of a safety bus power supply and a safety bus working power supply in real time, transmits the detection result to the programmable controller in real time, processes the acquired information, and when detecting that the safety bus power supply is abnormal, combines the power supply state of the safety bus power supply, the basic monitoring system, the power generation monitoring system, the circuit breaker protection system interaction information and other information acquired by the programmable controller, controls the switching of the safety bus main and standby working power supplies through comprehensive logic judgment, or sends corresponding instructions to the basic monitoring system, the power generation monitoring system and the circuit breaker protection system to start a generator set, and executes reliable switching of the safety bus working power supply and the generator set power generation; when the programmable controller controls the main and standby parallel switching or the power generation parallel switching, two paths of power sources which are switched back and forth are required to be adjusted by the synchronous device to reach a synchronous switching point, so that the phenomenon of energy impact or unsuccessful switching caused by asynchronous switching of the two paths of power sources is avoided; and the program control management system is also in information interaction with the DCS system of the thermal power plant through an input/output interface, so that a user can monitor the power supply state of the power supply of the security bus at the DCS of the thermal power plant.
The invention discloses a circuit breaker protection system, which comprises a PC monitoring device and an information processing unit, wherein the information processing unit respectively acquires information of a power generation outgoing circuit breaker and a feeder circuit breaker, the information is transmitted to the corresponding PC monitoring device, the PC monitoring device monitors the corresponding circuit breaker in real time, monitoring content comprises monitoring the quality of a power supply at the incoming line side of the circuit breaker, whether a circuit breaker switching-on/off control loop is normal, whether a PT detection loop is off or not, and the like, the PC monitoring device displays acquisition parameters on a display panel, the information processing unit executes the power generation outgoing circuit breaker and the power generation feeder circuit breaker, realizes switching-on/off operation of the circuit breaker, and meanwhile, exchanges information through an interface and a program control management system, participates in logic control, transmits state information of the circuit breaker to a DCS system of a thermal power plant, and displays the working state of the circuit breaker in the DCS system of the thermal power plant.
In the specific implementation process, the power generation outlet cabinet has the functions of diesel engine starting, stopping, rotating speed adjustment, operation monitoring, safety protection, generator operation monitoring, protection and the like; the power generation feeder cabinet is responsible for monitoring the power generation feeder and protecting the circuit breaker; the program control cabinet monitors the power supply state of each security section in real time, controls the effective switching of the main working power supply and the standby working power supply of the security section, safely switches the emergency power generation, and is responsible for coordinating the orderly work of the main working power supply, the standby working power supply and the emergency power supply, thereby ensuring the safe power supply of the security section.
Furthermore, the basic monitoring system of the invention realizes the functions of operation control, data measurement, parameter display, data remote transmission and system protection of the generator set.
1. Basic parameter display
| Sequence number | Name(s) | Display range | Remarks |
| 1 | Rotational speed | 0～2500rpm | |
| 2 | Cooling water temperature | 0～150℃ | |
| 3 | Engine oil temperature | 0～150℃ | |
| 4 | Engine oil pressure | 0～1.00MPa | |
| 5 | Cooling water pressure | 0～1.00MPa | |
| 6 | Voltage of accumulator | 0～50V |
2. Operation button
| Sequence number | Name(s) | Quantity (only) | Remarks |
| 1 | Starting up | 1 | |
| 2 | Emergency start | 1 | |
| 3 | Shutdown | 1 | |
| 4 | Emergency stop | 1 | Mechanical self-locking type protective cover |
| 5 | Response to a request | 1 | |
| 6 | Resetting | 1 | |
| 7 | Lubricating oil pre-supply | 1 |
3. Alarm item and parameter
| Sequence number | Name(s) | Parameter setting | Function of | Remarks |
| 1 | High cooling water temperature | 90℃ | Alarm device | |
| 2 | The engine oil has high temperature | 100℃ | Alarm device | |
| 3 | Low engine oil pressure | 0.3MPa | Alarm device | |
| 4 | Low battery voltage | 23.0～23.2V | Alarm device | |
| 5 | Low cooling water level | Switching value | ||
| 6 | High exhaust temperature | 550℃ | ||
| 7 | Too low engine oil pressure | Alarm, brake-off and stop | Switching value | |
| 8 | Overspeed device | 1695～1725r/min | Alarm, brake-off and stop | |
| 9 | Too high a water temperature | Alarm, brake-off and stop | Switching value |
4. Emergency start and stop
The starting and stopping operation of the generator set is limited by the control state of the program control management system. In order to meet the emergency requirement and protect the generator set, the basic monitoring system is provided with an emergency starting and emergency stopping control function, the operation is not limited by any control authority, and once an accident occurs, an emergency starting and emergency stopping button can be operated to meet the application requirement under the emergency condition.
After receiving the emergency starting command, the basic monitoring system is in any mode at the moment, the control system rapidly and forcedly breaks the main working power supply circuit breaker and the standby working power supply circuit breaker of each security section, simultaneously starts the generator set, closes the outlet circuit breaker of the generator after successful starting, and then sequentially inputs the feeder circuit breakers of each section. The emergency start execution flow is shown in fig. 6.
When emergency power generation and supply are needed after the power loss of the security section, before the feeder circuit breaker of the generator set is closed, the system automatically judges whether the main and standby working power supply circuit breakers are in an open state, if the main and standby working power supply circuit breakers are not in the open state, the system automatically opens the main and standby working power supply circuit breakers, and system faults caused by inconsistent electric parameters of two network sections when the main and standby working power supplies recover to supply power during the emergency power generation and supply can be effectively prevented.
Regardless of the state of the working mode, the emergency stop button is controlled at any time, the control system immediately executes corresponding actions to forcedly break the feeder circuit breaker and the outlet circuit breaker of the generator, and then the emergency stop of the generator set is controlled.
The emergency start is used in special cases to protect the operation mode of the forced start generator set adopted by important equipment of the power plant, and the safety performance of the generator set can be sacrificed in severe cases due to manual operation. Emergency shutdown is also an operational function in special situations, also manual, which is a protective operation employed on the power plant or the generator set itself. These two operations are not conventionally recommended.
In the specific implementation process, the power generation monitoring system is used for enabling all parts of the power generation unit to be at the optimal point, meeting the special requirements of a thermal power plant, and the comprehensive protection measurement and control device is used for realizing power generation electric quantity parameter display, protection project setting, protection parameter adjustment, protection action implementation mode selection and the like, so that the protection function is more reasonable and perfect.
The electric quantity parameters include: three-phase voltage, three-phase current, active power, reactive power, power factor, frequency, etc.
The operation functions are as follows: the outlet breaker is closed and the outlet breaker is opened.
According to the actual fault condition of the generator, the protection items and parameters are as follows:
ie is the generator secondary rated current value.
In the specific implementation process of the invention, the program control management system is responsible for the detection and control of the power supply of the security section, and the control system is provided with four working modes according to the field application condition and the possible working state, as shown in figure 7.
1. Automatic mode:
this mode is a normal operating mode, belonging to an unattended device.
1) Master-slave switching
The program control management system monitors the bus voltage of each safety bus section in real time, when any section of safety section is detected to lose electricity, if the safety section is powered by a main working power supply before losing electricity and a standby working power supply is normal, the program control management system controls a main working power supply breaker to be disconnected, and the standby working power supply is put into, so that the switching flow of the main working power supply and the standby working power supply is completed; if the standby power input fails, the program control management system controls the main and standby working power supplies to be completely withdrawn, and the starting process of the generator set is switched into; if the standby working power supply is abnormal when the power supply of the main working power supply fails, the program control system is directly switched into the starting process of the diesel generator set. The switching flow of the active and standby working power supplies is shown in fig. 8.
Similarly, when the program control management system detects that the security section loses power, the current security section is powered by the standby working power supply, and when the main working power supply is normal, the program control management system controls the standby working power supply breaker to be disconnected, and the main working power supply is put into, so that the main and standby working power supply switching process is completed; if the main working power input fails, the program control management system controls the main power supply and the standby power supply to be completely withdrawn, and the starting process of the generator set is switched into; if the main working power supply is abnormal when the standby working power supply fails in power supply, the program control management system directly shifts to the starting process of the generator set. The switching flow of the active and standby operating power is shown in fig. 9.
The judgment of the power failure reason when the safety section is powered off is added in the switching flow, namely that the power failure of the safety section is required to be confirmed when the power failure of the safety section is detected to be caused by the protective tripping of the main working power circuit breaker, and then the main and standby switching flow is executed; if the main working power circuit breaker detects faults such as short circuit and the like on the security section side and takes tripping protection action, the main and standby switching flow is not executed, so that further expansion of the faults can be avoided, unnecessary main and standby switching processes are avoided, further expansion of the faults is avoided, and meanwhile time is also striven for rush repair of the faults.
The circuit breaker working state detection adopts fault-tolerant processing, when the circuit breaker is opened, the normally open contact is opened, the normally closed contact is closed, when the circuit breaker is closed, the normally open contact is closed, the normally closed contact is opened, the program control management system collects a normally open and normally closed group of contacts of the circuit breaker, when the collected group of contacts are consistent in state, the program control management system considers that the circuit breaker working state collection is effective, otherwise, the circuit breaker working state collection is judged to be invalid, and the circuit breaker working state collection is shown in an attached drawing 10. The setting can avoid the occurrence of misjudgment of the working state of the circuit breaker caused by disconnection or short circuit, and prevent larger loss caused by misswitching of the power supply.
In order to efficiently switch the power supply of the security section, if only one section of security section is powered off at the same time and one section of power supply in the main working power supply or the standby working power supply is normal, the program control management system switches the main working power supply and the standby working power supply so as to ensure that the security section is powered on normally. If more than two safety sections are powered off at the same time, one power supply in the main and standby working power supplies of each safety section is normal, the program control management system controls the multiple safety sections without delay and simultaneously switches the main and standby working power supplies, and the safety sections are ensured to quickly recover normal power supply.
2) Input of generator set
When the main working power supply and the standby working power supply of the security section are all powered off, the program control management system controls the main working power supply or the standby working power supply to be disconnected, meanwhile, the generator set is started, after the program control management system detects that the generator set is normal in pressure, the generator set power generation outlet circuit breaker is closed, and then the power generation feeder circuit breaker corresponding to the power-off security section is closed, so that emergency power supply of the security section is realized, and the power supply is shown in an attached drawing 11.
When the program control management system detects that the main and standby working power supplies of more than two security sections are simultaneously powered off, the program control management system immediately starts a generator set, and after the successful construction of the generator set is detected, the emergency power generation outlet circuit breakers are firstly closed, then the feeder circuit breakers with high priority are firstly closed according to a preset sequence, and then the feeder circuit breakers of the emergency power supplies of other security sections are sequentially closed in a delayed mode, which is shown in figure 11.
And (5) recovering the main and standby power supply:
according to actual needs, the switching of the power supply after the main and standby working power supplies are recovered is divided into two switching modes of parallel switching and series switching.
And (3) parallel switching: in the process that the security section is powered by the generating set generating power supply, if the program control management system detects that the main working incoming line power supply section or the standby working power supply section restores to normal signals, the program control management system needs to control and adjust the synchronization of the generating set and the main working incoming line power supply section or the standby working power supply section respectively, when judging that the main working power supply or the standby working power supply and the emergency generating set generate power and adjust to the synchronization, the program control management system sends out a security section main working power supply or standby working power supply synchronization switching command, namely when synchronization conditions are met, the main working incoming line power supply section breaker or the standby power supply incoming line breaker is closed, after the main working incoming line power supply section or the standby working power supply section breaker is closed successfully, the generating set outlet breaker is opened, and the synchronization switching process is ended; if any link in the switching process has a problem, the system sends out a failure alarm signal, and the security section is still powered by the generator set power supply. The parallel switching flow is shown in figure 12.
Serial switching: in the process that the security section is powered by the generator set, if the program control management system detects that the main working incoming line power supply or the standby power supply is recovered to a normal signal, the program control management system sends out a disconnection instruction of the feeder circuit breaker of the security section corresponding to the security section, and after the feeder circuit breaker of the generator set is successfully disconnected, the main working incoming line power supply section or the standby working power supply incoming line section circuit breaker is controlled to be closed, and the successful serial connection switching process of closing is finished; if any link in the switching process has a problem, the system sends out a switching failure alarm signal. The series flighted flow Cheng Ru is shown in fig. 13.
3) Shutdown of generator set
And after the emergency power supply of the generator set is partially disconnected from the feeder circuit breakers of all the security sections, the power generation outlet circuit breaker is disconnected, and the generator set is controlled to be cooled and run for 5min (time is adjustable) and then automatically stopped. The generator set shutdown flow is shown in fig. 14.
Manual mode
The mode can be used as a manual operation after partial function failure of an automatic control system and also used for a system maintenance mode. In this mode, the system functions can be maintained regularly, and each function key is operated to verify whether the detection system and the execution system are in a normal state.
In the manual mode, an operator needs to know the field situation in detail and perform corresponding operation according to the field situation, at this time, the running state and parameter information displayed by the display system are particularly important, and the display system is the basis of the operation of the operator.
The display system can display the system operation parameters and system state information such as the parameter information and working state of each security section, the parameter information and power supply state of each power supply, the parameter information and working state of the generator set, the switching-on and switching-off state of each circuit breaker, the system fault alarm information and the like. The staff can judge the on-site working state according to the information collected by the control system. The working state and fault indication of each security section are shown in figure 15.
The manual control function set by the program control management system is as follows: the method comprises the steps of starting and stopping the generator set, wherein main working electric circuit breakers corresponding to all security bus sections are switched on and off, standby working power circuit breakers corresponding to all security sections are switched on and off, emergency power generation feeder circuit breakers corresponding to all security sections are switched on and off, and power generation outlet circuit breakers are switched on and off.
The switch-on and switch-off button of the main working power supply breaker or the standby working power supply breaker is operated to control the main working power supply or the standby working power supply to supply power to the safety bus section or stop supplying power to the safety section.
When the security section needs the power supply of the generator set, firstly, a start button of the generator set is pressed, after the voltage of the generator set is successfully built, a power generation outlet breaker is pressed, the generator set is in a pre-loaded state, and at the moment, a closing button of a power generation feeder breaker corresponding to the security section is operated to supply power to the security bus section. The manual start operation flow is shown in fig. 16.
In order to ensure the quality of the power supply of the security section, the system detects the emergency power supply. If the program control management system detects serious abnormal power generation, such as abnormal conditions of short circuit, overcurrent, overvoltage, undervoltage, overtrequency, underfrequency, reverse work and the like, the protection system acts and automatically breaks the power generation outlet breaker of the generator set. When the emergency stop button is operated under the abnormal condition of the generator set, the system controls the breaker to break.
When the voltage of the power generation outlet of the generator set is normal, the closing button of the power generation outlet breaker can be operated to close the outlet breaker, if the voltage of the power generation outlet is abnormal, the protection system acts, the closing button of the power generation outlet breaker is operated, and the system does not execute a closing instruction. The protection is the protection of the generator set and the protection of the load of the security section.
The circuit breaker switching-on and switching-off control loop is designed with a circuit breaker working state feedback signal, and if a corresponding switching-on button or switching-off button is operated for the circuit breaker in a switching-on state or switching-off state, the system does not execute corresponding operation, so that a switching-on and switching-off coil can be protected from being burnt out due to long-time energization, and the circuit breaker is shown in figure 17.
When the generator set stops supplying power to the security section, the corresponding security section feeder circuit breaker is operated at first, when all the power generation feeder circuit breakers are in the disconnection state, the switch-off key of the power generation outlet circuit breaker can be operated, the generator set can run for not less than 5min in the no-load state, and after the generator set is fully cooled, the generator set stop button can be operated to stop diesel engine running.
Test mode
In this mode, the manual operation buttons are all active, while the contemporaneous security section selection switch provided on the panel, contemporaneous permission selection change-over switch is also active.
The program control management system can simulate the power failure fault of the security section to perform the automatic starting test of the unit, and after the automatic starting test is successful, corresponding function keys are required to be manually operated to execute corresponding functions, and the functions and the operation methods are similar to those of the manual mode, but if the power failure condition of the mains supply occurs in the test process, the unit can automatically input automatic operation logic, and the automatic operation logic is not performed in the manual mode.
In the mode, once the main working power supply and the standby working power supply of the security section are powered off, the generator set can be automatically started and put into operation, the problem that the loss is caused by the fact that the power-off power generation of the security section cannot be put into operation in time during system maintenance can be avoided, but overhaul equipment personnel are not suitable for using the mode when in an electricity dangerous environment or near engine moving parts, and the mode is mainly used for system maintenance and partial equipment overhaul and needs careful use.
The parallel operation function of emergency power generation and main and standby working power can be simulated in the mode, the synchronous preparation switch is turned to be in an ON position firstly, then the network section voltage selection switch is turned manually to select a network section to be subjected to the grid-connected test, the synchronous device is started, an operator can observe a synchronous indicator ON a panel, when the synchronous point is reached, a power generation feeder closing button is pressed, the generator is subjected to grid-connected work, and the synchronous test is completed; in this mode, the load test of the generator set can be performed by operating the buttons on the control cabinet. Test mode the flow of operation is shown in figure 18.
When the manual operation generator set and the main working power supply or the standby working power supply run synchronously, the synchronous network section is manually selected, the program control management system automatically adjusts the synchronous operation of the generator set and the main power supply or the standby power supply, and outputs synchronous signals at the synchronous point, at the moment, the closing instruction of the feeder circuit breaker of the corresponding section is operated, the feeder circuit breaker is closed, and the synchronous closing operation is completed. In the past, when the synchronization is connected, workers often look at the synchronization instrument, find the synchronization point by virtue of working experience, and operate the switching-on key to enable the equipment to run synchronously when the synchronization point is felt, and the operation method has higher requirement on the experience level of the operators. In the system, not only is the synchronous indicator arranged, but also the automatic synchronous line is designed to assist manual synchronous operation, namely, after the synchronous loop is activated by operating the change-over switch, a worker operates the closing button, if the system does not find a synchronous point at the moment, the closing loop can not be closed, and the non-synchronous closing phenomenon is effectively avoided.
Maintenance/lockout mode
In this mode, only the emergency start, emergency stop, parameter detection and auxiliary function control can be performed, and the generator set power generation output operation cannot be performed.
This condition is mainly used for maintenance of the generator set and the monitoring system by the service personnel, and because the service personnel can overhaul beside the diesel engine, the mode is used once the machine is started, and the casualties or equipment damage can be caused.
In the specific implementation process, the circuit breaker protection system mainly uses a PC monitoring device, monitors the circuit breaker and the power generation output loop in real time through the PC monitoring device, and detects whether the circuit breaker switching-on and switching-off control loop is normal or not and whether the PT detection loop is disconnected or not as shown in fig. 19, and simultaneously measures parameters such as voltage, current, power factor and the like of the power generation output loop, so that the circuit breaker control loop is ensured to be completely normal, the electric quantity parameters are normal when the generator set operates, the use requirement is met, and the phenomenon that corresponding instruction cannot be executed due to the fault of the circuit breaker or the disconnection of an execution loop line under emergency conditions is prevented from happening, so that huge losses are avoided.
The protection system of the circuit breaker is provided with a fault alarm monitoring function, and when the protection system detects that a circuit breaker closing loop or a circuit breaker opening loop is disconnected, or a power generation output signal is abnormal, or a PT (potential transformer) detection loop is abnormal and other faults occur, the protection system sends out an audible and visual alarm signal to indicate the fault type.
The invention is not described in detail in the prior art.
The embodiments selected herein for the purposes of disclosing the present invention are presently considered to be suitable, however, it is to be understood that the present invention is intended to include all such variations and modifications as fall within the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a thermal power factory security bus power supply monitored control system, includes power generation line cabinet, feeder cabinet and program control cabinet, characterized by: the power generation outlet cabinet is respectively provided with a power generation outlet breaker, a basic monitoring system and a power generation monitoring system, the power generation outlet breaker and a breaker protection system are respectively arranged in the feeder cabinet, the program control cabinet is internally provided with a program control management system, the basic monitoring system is respectively connected with a power generation unit, a starting storage battery, a thermal power plant DCS system, a power generation monitoring system and a program control management system, the power generation monitoring system is respectively connected with the power generation outlet breaker, the power generation unit, the thermal power plant DCS system, the program control management system and the breaker protection system, the program control management system is respectively connected with a security bus section main working power supply, a wire inlet breaker, a security bus section standby working power supply, a wire inlet breaker, a security bus section, a thermal power plant DCS system, a power generation monitoring system, a basic monitoring system and a breaker protection system, and the breaker protection system are respectively connected with the power generation outlet breaker, the power generation feeder breaker, the power generation monitoring system, the program control system and the thermal power plant DCS system;
in order to efficiently switch the power supply of the security section, if only one section of security section is powered off and one section of power supply in the main working power supply or the standby working power supply is normal at the same time, the program control management system switches the main working power supply and the standby working power supply so as to ensure that the security section is powered on normally; if more than two safety sections are powered off at the same time, one power supply in the main and standby working power supplies of each safety section is normal, the program control management system controls the multiple safety sections without delay and simultaneously switches the main and standby working power supplies, so that the safety sections can be ensured to quickly recover normal power supply;
when the main working power supply and the standby working power supply of the security section are all powered off, the program control management system controls the main working power supply or the standby working power supply to be disconnected, meanwhile, the generator set is started, and after the program control management system detects that the generator set is normal in pressure, the generator set power generation outlet circuit breaker is closed firstly, and then the power generation feeder circuit breaker corresponding to the power-off security section is closed, so that emergency power supply of the security section is realized;
when the program control management system detects that the main and standby working power supplies of more than two security sections are simultaneously powered off, the program control management system immediately starts a generator set, and after the successful construction of the generator set is detected, the emergency power generation outlet circuit breaker is firstly closed, then the feeder circuit breakers with high priority levels are firstly closed according to a preset sequence, and then the feeder circuit breakers of the emergency power supplies of other security sections are sequentially closed in a delayed manner;
and (5) recovering the main and standby power supply:
according to actual needs, switching of power supply after the main and standby working power supplies are recovered is divided into two switching modes of parallel switching and series switching;
and (3) parallel switching: in the process that the security section is powered by the generating set generating power supply, if the program control management system detects that the main working incoming line power supply section or the standby working power supply section restores to normal signals, the program control management system needs to control and adjust the synchronization of the generating set and the main working incoming line power supply section or the standby working power supply section respectively, when judging that the main working power supply or the standby working power supply and the emergency generating set generate power and adjust to the synchronization, the program control management system sends out a security section main working power supply or standby working power supply synchronization switching command, namely when synchronization conditions are met, the main working incoming line power supply section breaker or the standby power supply incoming line breaker is closed, after the main working incoming line power supply section or the standby working power supply section breaker is closed successfully, the generating set outlet breaker is opened, and the synchronization switching process is ended; if any link in the switching process has a problem, the system sends out a failure alarm signal, and the security section is still powered by the generator set power supply;
serial switching: in the process that the security section is powered by the generator set, if the program control management system detects that the main working incoming line power supply or the standby power supply is recovered to a normal signal, the program control management system sends out a disconnection instruction of the feeder circuit breaker of the security section corresponding to the security section, and after the feeder circuit breaker of the generator set is successfully disconnected, the main working incoming line power supply section or the standby working power supply incoming line section circuit breaker is controlled to be closed, and the successful serial connection switching process of closing is finished; if any link in the switching process has a problem, the system sends out a switching failure alarm signal.
2. The thermal power plant safety bus power supply monitoring system according to claim 1, characterized in that: the basic monitoring system comprises a programmable controller, a safety protection unit, an emergency control unit and a parameter display unit, wherein the programmable controller is respectively connected with the control element, the safety protection unit, the emergency control unit, the parameter display unit, an engine sensing device, an engine executing device, a comprehensive protection measurement and control unit of a power generation monitoring system, a power generation line breaker, a programmable controller of a program control management system and a DCS (distributed control system) of a thermal power plant, the safety protection unit is respectively connected with the control element, the engine sensing device, the engine executing device and the programmable controller, and the emergency control unit is respectively connected with the emergency control element, the engine executing device and the programmable controller.
3. The thermal power plant safety bus power supply monitoring system according to claim 1, characterized in that: the power generation monitoring system comprises a comprehensive protection measurement and control unit and an electric quantity acquisition unit, wherein the comprehensive protection measurement and control unit is respectively connected with the control element, the electric quantity acquisition unit, a programmable controller of the basic monitoring system, a power generation outlet circuit breaker and a thermal power plant DCS monitoring system.
4. The thermal power plant safety bus power supply monitoring system according to claim 1, characterized in that: the programmable management system comprises a programmable controller, an electric quantity detection unit, a synchronous control unit and a parameter display unit, wherein the programmable controller is respectively connected with the electric quantity detection unit, the synchronous control unit, the parameter display unit, a control element, a power generation outgoing line breaker, a power generation feeder line breaker, a safety bus main working power supply incoming line breaker, a safety bus standby working power supply incoming line breaker, a basic monitoring system programmable controller, a circuit breaker protection system PC monitoring device and a thermal power plant DCS monitoring system, the electric quantity detection unit is respectively connected with the safety bus, the safety bus main working power supply, the safety bus standby working power supply and the programmable controller of the programmable controller, and the synchronous control unit is respectively connected with the power generation unit, the safety bus main working power supply, the safety bus standby working power supply and the programmable controller of the programmable controller.
5. The thermal power plant safety bus power supply monitoring system according to claim 1, characterized in that: the circuit breaker protection system comprises a control element, a PC monitoring device and an information processing unit, wherein the PC monitoring device is respectively connected with the control element, the power generation outgoing line circuit breaker, the power generation feeder circuit breaker, the programmable controller of the program control management system, the information processing unit and the DCS monitoring system of the thermal power plant.
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