CN100403194C - Control system of hermetic circulating type pure water cooling device for thyristor valve set - Google Patents
Control system of hermetic circulating type pure water cooling device for thyristor valve set Download PDFInfo
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- CN100403194C CN100403194C CNB2005101026546A CN200510102654A CN100403194C CN 100403194 C CN100403194 C CN 100403194C CN B2005101026546 A CNB2005101026546 A CN B2005101026546A CN 200510102654 A CN200510102654 A CN 200510102654A CN 100403194 C CN100403194 C CN 100403194C
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Abstract
The present invention discloses a control system of hermetic circulatory pure water cooling device for thyristor valve sets, which relates to a cooling device for thyristor valve sets in an electric power system and an electrical power electronic device. The present invention is mainly composed of four parts of a power supply and distribution system, a sampling measurement system, a controller and a man-machine interface. In the system a direct current power supply coupling design is adopted. A redundancy design is made for CPU and key meters. Temperature control is divided into a high, a middle and a low sections; dual nodes are adopted to confirm the start and stop logic of water cooling equipment. Continuous sampling can be carried out to the delivery level of a buffer tank to realize leakage protection for the system. An electromagnetic compatibility design can also be adopted to the system. The present invention can collects the on-line parameter of coolant of the water cooling system in real time, can alarm and can upload the parameter to a supervisory computer. Meanwhile, the present invention controls each electromechanical device of the water cooling device to operate in phase according to the change in load of the thyristor valves, stabilizes the temperature of the coolant in a preset temperature range, and makes the thyristor valves operate of high safety and reliability.
Description
Technical field
The present invention relates to the cooling device of the central thyristor valve group of electric system and power electronic equipment, particularly a kind of control system of hermetic circulating type pure water cooling device for thyristor valve set.
Background technology
Along with the raising day by day of China's living standards of the people, increasing household electrical appliance have entered into common people house, and this has changed the confession electricity consumption general layout of China's past based on industrial load, and the shared ratio of appliance load increases just day by day.Simultaneously appliance load has also become reactive power consumption based on household electrical appliance from the meritorious consumption based on lighting load in past, and the reactive power of power supply-distribution system has been difficult to satisfy user's demand, supply and distribution network reactive-load compensation urgent need capacity-increasing transformation.And since the uncertainty and the randomness of appliance load, the reactive requirement fast transient of system.Traditional switch on-off capacitor compensation mode be owing to can not follow the tracks of the variation of user's reactive requirement and problem such as switch on-off low-response, has been difficult to satisfy the electric network reactive-load fast-changing present situation of loading today.
Since the U.S. succeeded in developing the Static Var Compensator (SVC) of first use thyristor, Static Var Compensator became the mainstay in static reactive field rapidly with its fast response characteristic and good reactive-load compensation performance.Static Var Compensator is by changing the thyristor conduction angle, the continuous adjustment system reactive compensation capacity adapts to the quick variation of user's reactive requirement, or utilize the high-speed switch characteristic switched capacitor of thyristor, response user reactive requirement changes fast, improve the system power factor, improve the system voltage quality.80 generation ends of twentieth century, China has also succeeded in developing the Static Var Compensator of oneself, and subsequently replace rapidly traditional switch on-off capacitor compensation mode during the last ten years, obtained using widely in high pressure power transmission and distribution field, in the reactive-load compensation of China's electric system, brought into play irreplaceable effect.
The thyristor valve capacity of Static Var Compensator is big, efficient is high, but it self power attenuation is also bigger, and it is more serious to generate heat, and as not cooled off immediately, certainly will be difficult to normal operation.The type of cooling of thyristor valve generally has types such as air cooling, oil cooling, water-cooled, boiling cooling.Wherein water-cooling pattern, noiseless big with its cooling effectiveness height, capacity, non-maintaining, the thyristor valve body advantage such as little that takes up room is adopted by countries in the world.Follow the development of Static Var Compensator, China has also begun the research of the cooling device of thyristor valve.And because Thyristor Controlled Reactor (TCR) technology can be brought harmonic pollution and electromagnetic interference (EMI), requiring the water cooling plant control system to place oneself in the midst of can reliable and stable work under the strong electromagnetic interference environment.
Hermetic circulating type pure water cooling device mainly is made up of major cycle cooling circuit, secondary circulating water treatment loop, nitrogen stabilization pressure system and control system.Fig. 1 is seen in the concise and to the point technological process of hermetic circulating type pure water cooling device.
In the major cycle cooling circuit, the heat eliminating medium thyristor valve body of flowing through continually under the main circulation pump dynamic action is taken heat out of, and temperature rise water carries out heat interchange through air radiator and cooling air, is back to the main circulation pump import after the heat radiation and realizes the function of cooling continuously.
Secondary circulating water treatment loop in parallel on the major cycle cooling circuit.Secondary circulating water treatment loop mainly is made up of mixed-bed exchanger and related accessories.For adapting to the request for utilization of large power power electronic appliance under high voltage condition, prevent under high voltage environment, to produce leakage current, heat eliminating medium must possess high resistivity.Therefore by the mixed-bed exchanger in the middle of the secondary circulating water treatment loop and related accessories the part heat eliminating medium of main circulation loop is carried out purifying, constantly remove the medium intermediate ion, reach the purpose of long term maintenance heat eliminating medium high resistivity.
On secondary circulating water treatment loop, be in series with the nitrogen stabilization pressure system, form by surge tank, nitrogen cylinder and serial operation valve.The surge tank top is filled with the high pure nitrogen of steady pressure, when chilled water because of exosmose on a small quantity or electrolysis, when evaporation is lost, nitrogen is expanded automatically, and chilled water is pressed into circulating pipe system, to keep the constant pressure of pipeline and being full of of chilled water.Simultaneously nitrogen completely cuts off chilled water and air, and the stable of indexs such as resistivity of heat eliminating medium in the pipeline played an important role.
Control system is the core of hermetic circulating type pure water cooling device, on-line parameter monitoring when undertaking really, the important task that warning message is uploaded, electromechanical equipment is controlled.Control system is monitored each on-line parameter such as coolant temperature, pressure, flow, resistivity in real time, variation according to system operation instruction and each on-line parameter value, coordinate the action of each electromechanical equipment of this pure water cooler of control, motorized valve, solenoid valve, each on-line parameter is stabilized in the setting range.Simultaneously the parameter that exceeds setting range is reported to the police and also upload host computer in real time.Host computer is taked measures such as early warning, tripping operation according to the warning order of severity, prevent to cause because of this pure water cooler fault the damage of thyristor valve, makes the accident expanded range, guarantees the safe operation of whole thyristor valve group.
Summary of the invention
The control system of hermetic circulating type pure water cooling device that the purpose of this invention is to provide a kind of thyristor valve group, can gather on-line parameters such as pure water cooler coolant temperature, flow, pressure, resistivity in real time, when parameters such as coolant temperature, flow, pressure, resistivity exceed setting range, report to the police and upload host computer; Simultaneously according to the thyristor valve load variations, the water cooling plant heat dissipation capacity is regulated in each the electromechanical equipment coordinated operation of control water cooling plant, and coolant temperature is stabilized in the design temperature scope, makes the thyristor valve safe and reliable operation.
The present invention solves the technical scheme that its technical matters takes:
Control system of hermetic circulating type pure water cooling device for thyristor valve set mainly is made up of power supply-distribution system, sampled measurements system, controller and man-machine interface four major parts.
In power supply-distribution system, comprise the main circulation pump of two the using and the reserved, small pump, blower fan, electric T-shaped valve, electromagnetic valve of gas circuit, electric heater and power transfer device; Power transfer device has two electrical source of power inlet wires; Main circulation pump, small pump, electric heater are connected with power transfer device respectively.
Controller control automatically main circulation pump startup, stop, switching, simultaneously according to actual conditions output early warning and trip signal.
Small pump can start by the self-resetting type knob when standby mode and mode of operation, stops automatically when the surge tank liquid level reaches the termination of pumping liquid level.
The rotating speed of blower fan is controlled according to target temperature setting value and current supply water temperature, controller changes according to deviation between current supply water temperature and target temperature, after carrying out the PID computing, export an analog quantity and give frequency converter, frequency converter is according to the increase of this signal/reduce to come raising frequency/frequency reducing, the control rotation speed of fan, thus the system radiating amount changed, accurately control supply water temperature.
The switching of electric T-shaped valve is controlled according to the setting operating temperature range of electric T-shaped valve, and supply water temperature is stabilized in the electric T-shaped valve operating temperature range.Temperature control is by low-temperature zone, middle-temperature section, high temperature section segmentation control, and the switch electric T-shaped valve with the difference of temperature makes supply water temperature stable.
Electric heater starts when supply water temperature is lower than the setting limit value, and supply water temperature is low excessively to cause thyristor valve body to damage to avoid; Supply water temperature is during near valve Room dew point, the electric heater force start.The startup of electric heater and main circulation pump operation and cooling water flow are set the limit value interlocking, and electric heater was forbidden operation when main circulation pump stoppage in transit or cooling water flow were lower than the setting limit value.
Electromagnetic valve of gas circuit is controlled by controller, and according to surge tank pressure high-low limits and automatic switch, thereby the pressure stability that makes surge tank within the specific limits, and guarantees that whole hermetic circulating type pure water cooling device for thyristor valve set keeps certain static pressure.
This control system fault alarm is reported to the police with warning message and two kinds of forms of alerting signal.Warning message is reported to the police on the OP guidance panel with the information bar form.Alerting signal occurs with the form of sound and light alarm.Warning message and alerting signal all can be uploaded host computer, and warning message is uploaded by serial ports, and alerting signal is uploaded with dry contact.
This control system is provided with leak protection, by the continuous sampling to the surge tank level value, sets up database analysis, judges that this pure water cooler leaks character to realize the leak protection to this pure water cooler; With of the protection of surge tank liquid level as this control system leakage; set up database by CPU level value is carried out timing sampling and comparison; the speed that descends with liquid level is judged the leakage of this pure water cooler, leaks to be divided into little seepage and two grades of gross leak, carries out early warning or tripping operation respectively.CPU avoids the generation of reporting by mistake to because temperature compares the situations such as the unusual change of liquid level that cause and screen suddenly simultaneously.
In the communication mode of this control system, remote control signal and this control system alerting signal that real-time is had relatively high expectations adopt the switching value node communication, on-line parameter monitoring and this control system warning message bigger to quantity of information adopt the RS485 serial communication, and serial communication is arranged communication protocol by both sides and carried out.Adopt communication agreement of free space between this control system and host computer, communication protocol is arranged by communicating pair.
Adopt dual node to confirm the remote activation of this pure water cooler and stop logic: the order of remote activation water-cooled should be the maintenance node; Ceasing and desisting order should be a time-delay disconnected node, has prevented the disturbing pulse mistakenly stop.The remote activation order and the while of ceasing and desisting order, this pure water cooler was not shut down when effective.
This control system EMC Design has taked strong and weak electricity Isolated Shield, control power filter, converter power supply side EMI filtering, cable shield ground connection, cable end piece to absorb measures inhibition electromagnetic interference (EMI) such as ring absorption and system earth, on software logic different meter performances and parameter monitoring is required to formulate corresponding time-delay scheme.Switch amount is carried out the filtering of 300～500ms simultaneously.
This pure water cooler power supply is by the design of two stage loads, and this pure water cooler power supply is divided into ac power power supply and DC control supply, the equal two-circuit of ac power power supply and DC control supply inlet wire.
Ac power power supply two-circuit inlet wire the using and the reserved guarantee this pure water cooler electrical source of power uninterrupted power supply.
DC control supply two-circuit inlet wire is exported to control loop by diode-coupled, and two-circuit inlet wire heat each other is equipped with.When one road incoming power is lost, can not have disturbance and switch to another road electric power incoming line, realize the uninterrupted power supply of DC control supply.
This pure water cooler power supply-distribution system electrical source of power designs for three-phase five-wire mode, i.e. the TN-S protection system.
The sampled measurements system is made up of measurement instruments such as temperature, pressure, flow, resistivity.The sampled measurements system is to on-line parameter real-time samplings such as this pure water cooler coolant temperature, pressure, flow, resistivity, and changes each on-line parameter into 4～20mA standard analog amount signal or bound switching value signal is sent to controller in real time.
Redundant instrument is established in the monitoring of important parameters such as this pure water cooler supply water temperature, chilled water resistivity, and heat is equipped with each other, prevents because this control system instrument fault causes thyristor valve to be stopped transport.Send out early warning and alarming when any instrument indication value surpasses the early warning limit value in the redundant instrument, remind the operations staff in time to handle; Just send out tripping alarm when two instrument indication values are all above the tripping operation limit value in the redundant instrument, prevent wrong report.
Controller adopts Programmable Logic Controller PLC, is made up of CPU module, interface module, digital quantity input module, digital quantity output module, analog quantity load module, analog output module and communication module.
This control system CPU makes Redundancy Design.Form by CPU A and CPU B, realize soft redundancy by configuration between CPU A and the CPU B.Under the usual condition, CPU A is as master controller, between CPU B and the CPU A by the MPI bus transfer data, also image data on the on-the-spot I/O module of CPU B simultaneously, but CPU B does not export control command.In case CPUA breaks down, CPU B can take over this control system master controller work immediately, and this control system does not have the normal operation in disturbance ground.CPU A enters stand-by state automatically after maintenance is good.
Interface module is used to connect each frame of Programmable Logic Controller S7-300, is mainly used in the Redundancy Design of CPU herein.
Digital quantity input module is used to gather each electromechanical equipment operation, malfunction and sampled measurements system each bound switching value signal and operational order.
The digital quantity output module is used to control the start and stop of each electromechanical equipment.
The analog quantity load module is used to gather 4～20mA standard analog amount signal of each on-line parameter of sampled measurements system.
Analog output module is used for the operation result of controller is converted to standard analog amount signal, the frequency lifting of control of conversion device, thus change the air radiator rotation speed of fan, change the system radiating amount.
Communication module is used for this control system alerting signal, equipment running status and on-line parameter are converted to serial data, arranges communications protocol by both sides and is uploaded to host computer.
Man-machine interface is accepted operating personnel's operational order with each electromechanical equipment running status of graphics mode display system and each real-time monitoring parameter.Establish the operation picture page, the parameter setting page, current page fault, the historical record page on the man-machine interface, empty the record page and help the page.
Owing to adopted above-mentioned technical scheme, the beneficial effect that the present invention has is: this control system is as the core of hermetic circulating type pure water cooling device, and on-line parameter is monitored when undertaking really, warning message is uploaded, the function of electromechanical equipment control.This control system is monitored each on-line parameter such as coolant temperature, pressure, flow, resistivity in real time, variation according to this control system operational order and each on-line parameter value, coordinate the action of each electromechanical equipment of this pure water cooler of control, motorized valve, solenoid valve, each on-line parameter is stabilized in the setting range.Simultaneously the parameter that exceeds setting range is reported to the police and also upload host computer in real time.Host computer is taked measures such as early warning, tripping operation according to the warning order of severity, prevent to cause because of the water cooling plant fault damage of thyristor valve, makes the accident expanded range, can guarantee the safe operation of whole hermetic circulating type pure water cooling device for thyristor valve set.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the hermetic circulating type pure water cooling device process flow diagram.
Fig. 2 is that the hermetic circulating type pure water cooling device system forms theory diagram.
Fig. 3 is the power supply-distribution system sketch.
Fig. 4 is CPU Redundancy Design figure.
Fig. 5 is the control principle block diagram of blower fan.
Embodiment
Referring to accompanying drawing, describe the present invention.
As Fig. 2, control system of hermetic circulating type pure water cooling device mainly is made up of power supply-distribution system, sampled measurements system, controller and man-machine interface four major parts.
As Fig. 3, in power supply-distribution system, comprise the main circulation pump of two the using and the reserved; Small pump; Blower fan; Electric T-shaped valve; Electromagnetic valve of gas circuit; Electric heater; Power transfer device etc.; Power transfer device has two electrical source of power inlet wires; Main circulation pump, small pump, electric heater are connected with power transfer device respectively.
This control system power supply is by the design of two stage loads, and this control system power supply is divided into ac power power supply and DC control supply, the equal two-circuit of ac power power supply and DC control supply inlet wire.
Ac power power supply two-circuit inlet wire the using and the reserved, when fault such as power down, phase shortage occurring when a loop incoming power, another loop incoming power drops into immediately, guarantees water cooling plant electrical source of power uninterrupted power supply.
For guaranteeing that this pure water cooler runs without interruption, prevent this control system because the control loss of power is stopped transport this pure water cooler, cause the host computer tripping operation to be stopped transport.DC control supply two-circuit inlet wire is exported to control loop by diode-coupled, two-circuit inlet wire heat each other is equipped with, when one road incoming power is lost, can not have disturbance and switch to another road electric power incoming line, realize the uninterrupted power supply of DC control supply, thereby improve this pure water cooler operational reliability.
This control system power supply-distribution system electrical source of power is pressed three-phase five-wire mode design, i.e. TN-S protection system.
Each electromechanical equipment distribution of this pure water cooler is all established short-circuit protection, overload protection and o-volt protection.O-volt protection is realized by contactor or relay; Three phase electric machine short-circuit protection, overload protection are realized by the adjustable fuser motor of band short circuit, overload protection and rated current; The monophase machine short-circuit protection is realized that by isolating switch overload protection is realized by electrothermal relay.
The sampled measurements system is to on-line parameter real-time samplings such as described pure water cooler coolant temperature, pressure, flow, resistivity, and changes each on-line parameter into 4～20mA standard analog amount signal or bound switching value signal is sent to controller in real time.The sampled measurements system is made up of measurement instruments such as temperature, pressure, flow, resistivity.
For guaranteeing the control system of hermetic circulating type pure water cooling device for thyristor valve set safe and stable operation, prevent because this control system instrument fault causes thyristor valve to be stopped transport, redundant instrument is established in monitoring to important parameters such as supply water temperature, chilled water resistivity, and heat is equipped with each other.
Send out early warning and alarming when any instrument indication value surpasses the early warning limit value in the redundant instrument, remind the operations staff in time to handle; Just send out tripping alarm when two instrument indication values are all above the tripping operation limit value in the redundant instrument, prevent wrong report.
Sampling instrument function and parameter see following table for details:
The sampling instrument complete list
Controller is the core component of whole control system of hermetic circulating type pure water cooling device for thyristor valve set, realizes data acquisition, Realtime Alerts, device control, the data upload function of this control system by it.
Controller adopts the Programmable Logic Controller PLC that antijamming capability is strong, reliability is high, is made up of CPU module, interface module, digital quantity input module, digital quantity output module, analog quantity load module, analog output module and communication module.
The CPU module claims CPU (central processing unit) again, and CPU is the core of computing machine, also is the core of PLC.Read and carry out user program one by one by it, finish the operations such as logical operation, arithmetical operation and data processing of user program defined.For improving this control system reliability, this control system CPU makes Redundancy Design.Realize soft redundancy by configuration between CPU A and the CPU B, promptly when CPU A broke down, the undisturbed CPU B that switches to of this control system moved, and sends alerting signal simultaneously.Can overhaul this moment to CPU A.Under the usual condition, CPU A is responsible for the work of on-site data gathering, calculating, judgement, warning and control as master controller.By the MPI bus transfer data, yet image data on the on-the-spot I/O module of CPU B is yet calculating and judging, but CPU B is not exported control command simultaneously between CPU B and the CPU A.In case CPU A breaks down, CPU B can take over this control system master controller work immediately, and this control system does not have the normal operation in disturbance ground.CPU A enters stand-by state automatically after maintenance is good.CPU A, CPU B also can switch masterslave state manually in addition.CPU Redundancy Design scheme is seen Fig. 4.
Interface module is used to connect each frame of Programmable Logic Controller S7-300, is mainly used in the Redundancy Design of CPU herein.
Digital quantity input module is used to gather each electromechanical equipment operation, malfunction and sampled measurements system each bound switching value signal and operational order.
The digital quantity output module is used to control the start and stop of each electromechanical equipment.The start and stop that contactor by controlling each electromechanical equipment or relay on-off come opertaing device.
The analog quantity load module is used to gather 4～20mA standard analog amount signal of each on-line parameter of sampled measurements system.
Analog output module is used for the operation result of controller is converted to the frequency lifting of standard analog amount signal controlling frequency converter, thereby changes the air radiator rotation speed of fan, reaches the purpose that changes the system radiating amount.
Communication module is used for this control system alerting signal, equipment running status and on-line parameter are converted to serial data, arranges communications protocol by both sides and is uploaded to host computer.
In man-machine interface, man-machine interface is with each electromechanical equipment running status of this control system of demonstration and each real-time monitoring parameter of graphics mode lifelike image, accept operating personnel's operational order and control each electromechanical equipment operation, handled easily personnel real-time monitoring equipment running status.It is the bridge of realizing human-computer interaction.
Establish the operation picture page on the man-machine interface, parameter is established the page, current page fault, the historical record page, empties the record page and is helped the page.
The operation picture background is the hermetic circulating type pure water cooling device for thyristor valve set process flow diagram, shows each on-line measurement parameter, the current running status of this control system of visual in image demonstration on process flow diagram in real time.
Number is set the page and can be set the high lower bound alarm limit of each on-line measurement parameter value, and personnel safeguard debugging with handled easily.For preventing operating personnel's malfunction, parameter setting is established cryptoguard.
The electromechanical equipment fault of the current existence of current page fault register system and on-line parameter overload alarm information, fault are got rid of or on-line parameter recovers normal and after operating personnel confirmed, warning message disappeared.
The All Alerts information that historical record page record system once took place, detail record has respectively report to the police time of origin and release time, and the maintenance that can have a power failure of these records is convenient to the operation maintenance personnel and is carried out fault analysis.
Emptying the record page can empty historical record page warning message, empties record and establishes cryptoguard.
Help page detail record that each function key operating function of OP guidance panel is arranged, make things convenient for the operation maintenance personnel operation to safeguard.
Introduce operator scheme of the present invention below:
Control system of hermetic circulating type pure water cooling device for thyristor valve set operation be divided into standby stop three kinds of patterns of work.
This pure water cooler be can't help PLC and is controlled automatically during standby mode, the manual operation only of each electromechanical equipment, and this pattern is generally safeguarded and is adopted during debugging at system overhaul.During standby mode and upper machine communication stop.
Stop mode forbids carrying out any operation, stops with upper machine communication.
During mode of operation, this pure water cooler both can use button startup automatically on the spot on the OP guidance panel, also can be by the host computer remote activation.After this pure water cooler automatically starts, main circulation pump, electric heater, electric T-shaped valve, solenoid valve, and blower fan etc. control automatically according to actual operating conditions by PLC.During mode of operation and upper machine communication open-minded.
One, device control logic:
1) main circulation pump: two main circulation pump the using and the reserved, PLC control automatically main circulation pump startup, stop, switching, simultaneously according to actual conditions output early warning and trip signal; Low when water supply flow, pressure of supply water is low, when process pump overload or process pump are overheated, PLC pump out of service also switches to stand-by pump work, " main pump switches, please overhaul and confirm in output simultaneously! " the warning message bar.
Main circulation pump operation was continuously rotated in 168 hours automatically.
1) small pump: small pump all can start by the self-resetting type knob when standby mode and mode of operation, stops automatically when the surge tank liquid level reaches the termination of pumping liquid level.
2) blower fan: the rotating speed of blower fan is controlled by target temperature setting value and current supply water temperature, PLC according to current supply water temperature and and the target temperature setting value between deviation change, after carrying out the PID computing, export an analog quantity and give frequency converter, frequency converter is according to the increase of this signal/reduce to come raising frequency/frequency reducing, the control rotation speed of fan, thus change the system radiating amount, make supply water temperature approach target temperature gradually and also finally be stabilized near the target temperature, reach the purpose of accurate control supply water temperature.Control principle block diagram such as Fig. 5 of blower fan:
3) electric T-shaped valve: the switching of electric T-shaped valve is controlled by the setting operating temperature range of electric T-shaped valve.Supply water temperature is lower than the electric T-shaped valve of prescribing a time limit under the operating temperature range and closes, supply water temperature is higher than electric T-shaped valve unlatching in limited time on the electric T-shaped valve operating temperature range, supply water temperature is between the operating temperature range upper and lower limit time, PLC opens/closes according to supply water temperature lifting/lowering trend control electric T-shaped valve, change the system radiating amount, try hard to make supply water temperature to be stabilized in the electric T-shaped valve operating temperature range.
4) electric heater: supply water temperature is lower than when setting limit value, and supply water temperature is low excessively to cause thyristor valve body to damage to avoid in the electric heater startup.
Supply water temperature is during near valve Room dew point, the electric heater force start.
The startup of electric heater and main pump operation and the ultralow value interlocking of cooling water flow, electric heater was forbidden operation when main pump stoppage in transit or cooling water flow were ultralow.
5) electromagnetic valve of gas circuit: PLC is according to surge tank pressure high-low limits, the automatic switch electromagnetic valve of gas circuit, thus the pressure stability that makes surge tank is within the specific limits, and guarantee that whole pure water cooler keeps certain static pressure.
Two, temperature control logic
The SVC device is by changing the conduction angle of thyristor, regulate the quick variation that this SVC device reactive compensation capacity adapts to user's reactive requirement continuously, the conduction angle difference of thyristor valve flows through the current effective value difference of thyristor valve, and the thermal value of thyristor valve is also different.And thyristor requires supply water temperature basicly stable when using, and forbids the supply water temperature rapid drawdown that rises sharply, and therefore requires this pure water cooler to change water-cooling amount and follows the tracks of the thyristor valve thermal load and change, and supply water temperature is stabilized in the setting range.
Temperature control is by low-temperature zone, middle-temperature section, high temperature section segmentation control.
Low-temperature zone: winter, outdoor environment temperature was extremely low, the thyristor valve underrun, and when supply water temperature was in low-temperature zone, this moment, the electric T-shaped valve complete shut-down excised outdoor air heating radiator cooling circuit, made system radiating amount minimum.As this moment supply water temperature continue to descend, when dropping to setting value, start electric heater, prevent that supply water temperature is low excessively and cause thyristor valve to damage; Or supply water temperature starts electric heater when dropping near dew point, prevents the thyristor valve body dewfall.
Middle-temperature section: when supply water temperature is in middle-temperature section, changes the heat eliminating medium air radiator flow of flowing through by the ON/OFF electric T-shaped valve, thereby change the system radiating amount, supply water temperature is stabilized in the electric T-shaped valve operating temperature range.
High temperature section: summer, outdoor environment temperature was higher, the thyristor valve oepration at full load, when supply water temperature is in high temperature section, the electric T-shaped valve standard-sized sheet, the heat eliminating medium air radiator cooling circuit of all flowing through, the system radiating amount is regulated in conjunction with the fan frequency conversion speed governing by control fan starting platform number.
Three, fault alarm
The control system of hermetic circulating type pure water cooling device for thyristor valve set fault alarm is reported to the police with warning message and two kinds of forms of alerting signal, and information bar is reported to the police and accompanied by the alerting signal sound and light alarm.
Warning message is reported to the police on the OP guidance panel with the information bar form, its detail record information such as failure cause, malfunction, time of failure, be convenient to the operation maintenance personnel and review the fault occurrence cause.
Alerting signal occurs with the form of sound and light alarm, reminds the operation maintenance personnel in time to fix a breakdown.Alerting signal is divided into early warning, two grades of tripping operation according to this pure water cooler fault order of severity.When this pure water cooler generation minor failure, do not influence thyristor valve and continue operation, this moment, this control system was sent early warning signal, reminded the operator on duty in time to fix a breakdown; When this pure water cooler generation catastrophic failure, thyristor valve continues to move when the danger of damage is arranged, and this control system is sent trip signal, and host computer receives this signal and should immediately thyristor valve be stopped transport.
Warning message and alerting signal all can be uploaded host computer, and warning message is uploaded by serial ports, and alerting signal is uploaded with dry contact.
Four, leak logic
Characteristics at the operation of closed circulating water cooling system; the protection of selecting the surge tank liquid level in this pure water cooler to leak as this pure water cooler; set up database by CPU level value is carried out timing sampling and comparison; judge the leakage of this pure water cooler with the speed of liquid level decline; leakage is divided into little seepage and two grades of gross leak, carries out early warning or tripping operation respectively.CPU avoids the generation of reporting by mistake to because situations such as the unusual change of the liquid level that temperature decrease causes compare and screen simultaneously.
The communication of control system of hermetic circulating type pure water cooling device for thyristor valve set and communication protocol
The remote control signal that real-time is had relatively high expectations adopts the switching value contact to communicate by letter with this control system alerting signal, on-line parameter monitoring and this control system warning message bigger to quantity of information adopt the RS485 serial communication, and serial communication is arranged communication protocol by both sides and carried out.
Adopt communication agreement of free space between this control system and host computer, communication protocol is arranged by communicating pair.The communication protocol Physical layer is deferred to RS485 serial communication interface standard, and transmission medium is a shielded twisted-pair cable.The serial communication data are that unit transmits with the frame, and every frame data byte length determines that as required all bytes all send with ASCII character and receive.Each byte sends with the form of start bit, information bit, position of rest, check bit.This control system externally sent continuously with the fixed cycle, and each cycle externally sends 1 frame data.Every of standby character is 0.Every frame data structure example is as follows:
The 1st～36 byte is this control system on-line parameter data field, and each on-line parameter adopts the ASCII character mode with 3 byte representations.
The 37th～41 byte is this control system warning message data field, the corresponding warning message of each of each byte.This place value for " 1 " promptly represent to should the position warning message effective, this place value for " 0 " promptly represent to should the position warning message invalid.
The 42nd byte is this control system electromechanical equipment running state data district, each corresponding equipment running status.This place value promptly represents equipment operation that should the position for " 1 ", and this place value is stopped transport to equipment that should the position for " 0 " is promptly represented.
The 43rd byte is verification and least-significant byte.Verification and be the algebraic sum of every all information characters of frame data.
The 44th～48 byte is that every frame data finish identification character.
Adopt dual node to confirm the remote activation of this pure water cooler and stop logic: the remote activation order should be retaining contact, promptly remains closed behind the remote activation always, disconnects when ceasing and desisting order; Ceasing and desisting order should be a time-delay break, and delay time was preferably for 1 second, had prevented disturbing pulse mistakenly stop water-cooled.The remote activation order and the while of ceasing and desisting order, this pure water cooler was not shut down when effective.
The EMC Design of hermetic circulating type pure water cooling device
Hermetic circulating type pure water cooling device works under the strong electromagnetic interference environment, and this control system EMC Design is the key that guarantees the reliable and stable operation of this pure water cooler.
The main interference source of this pure water cooler working environment has: inner harmonic pollution that frequency converter produces and the noise that uses the PWM technology of harmonic pollution that produces in the electromagnetic noise that causes owing to current transients in high-tension line corona discharge noise, the thyristor valve switch process, the reactor operational process and electromagnetic noise and this control system.
At the conduction of above interference source and electromagnetic interference (EMI), radiation coupling path, take strong and weak electricity Isolated Shield, control power filter, converter power supply side EMI filtering, cable shield ground connection, cable end piece to absorb measures such as ring absorption and system earth in this control system EMC Design and suppressed electromagnetic interference (EMI), on software logic, different meter performances and parameter monitoring have been required to formulate corresponding time-delay scheme.Switch amount is carried out the filtering of 300～500ms simultaneously, has passed through electric fast transient interference test, static discharge interference test and radiation field interference test smoothly.The harsh grade of electricity fast transient interference test: III level; The harsh grade of static discharge interference test: III level.
Claims (9)
1. a control system of hermetic circulating type pure water cooling device for thyristor valve set is characterized in that, mainly is made up of power supply-distribution system, sampled measurements system, controller and man-machine interface four major parts;
In power supply-distribution system, comprise the main circulation pump of two the using and the reserved, small pump, blower fan, electric T-shaped valve, electromagnetic valve of gas circuit, electric heater and power transfer device; Power transfer device has two electrical source of power inlet wires; Main circulation pump, small pump, electric heater are connected with power transfer device respectively;
Controller control automatically main circulation pump startup, stop, switching, simultaneously according to actual conditions output early warning and trip signal;
Small pump can start by the self-resetting type knob when standby mode and mode of operation, stops automatically when the surge tank liquid level reaches the termination of pumping liquid level;
The rotating speed of blower fan is controlled according to target temperature setting value and current supply water temperature;
The switching of electric T-shaped valve is controlled according to the setting operating temperature range of electric T-shaped valve, and supply water temperature is stabilized in the electric T-shaped valve operating temperature range;
Electric heater is regulated the temperature that supplies water, and avoids water temperature low excessively; The startup of electric heater and main circulation pump operation and cooling water flow are set the limit value interlocking, and electric heater was forbidden operation when main circulation pump stoppage in transit or cooling water flow were lower than the setting limit value;
Electromagnetic valve of gas circuit is controlled by controller, and according to surge tank pressure high-low limits and automatic switch, thereby the pressure stability that makes surge tank within the specific limits, and guarantees that whole described pure water cooler keeps certain static pressure;
Described control system fault alarm can be uploaded host computer;
Described control system is provided with leak protection, by the continuous sampling to the surge tank level value, sets up database analysis, judges that described pure water cooler leaks character to realize the leak protection to described control system;
In the communication mode of described control system, remote control signal and described control system alerting signal that real-time is had relatively high expectations adopt the switching value node communication, on-line parameter monitoring and the described control system warning message bigger to quantity of information adopt the RS485 serial communication, and serial communication is arranged communication protocol by both sides and carried out; Adopt communication agreement of free space between described control system and host computer, communication protocol is arranged by communicating pair;
Adopt dual node to confirm the remote activation of described pure water cooler and stop logic: the order of remote activation water-cooled should be the maintenance node; Stop the water-cooled order and should be a time-delay disconnected node, prevented disturbing pulse mistakenly stop water-cooled; Remote activation water-cooled order and stop the water-cooled order simultaneously effectively the time, described pure water cooler is not shut down;
Described control system adopts strong and weak electricity Isolated Shield, control power filter, converter power supply side EMI filtering, cable shield ground connection, cable end piece to absorb the ring absorption and six measures of system earth suppress electromagnetic interference (EMI), on software logic different meter performances and parameter monitoring is required to formulate corresponding time-delay scheme; Switch amount is carried out the filtering of 300～500ms simultaneously;
Described pure water cooler power supply is by the design of two stage loads, and described pure water cooler power supply is divided into ac power power supply and DC control supply, the equal two-circuit of ac power power supply and DC control supply inlet wire;
Ac power power supply two-circuit inlet wire the using and the reserved guarantee described pure water cooler electrical source of power uninterrupted power supply;
DC control supply two-circuit inlet wire is exported to control loop by diode-coupled, and two-circuit inlet wire heat each other is equipped with; When one road incoming power is lost, can not have disturbance and switch to another road electric power incoming line, realize the uninterrupted power supply of DC control supply;
Described pure water cooler power supply-distribution system electrical source of power designs for three-phase five-wire mode, i.e. the TN-S protection system;
The sampled measurements system is made up of temperature, pressure, flow, four kinds of measurement instruments of resistivity, the sampled measurements system is to four on-line parameter real-time samplings of coolant temperature, pressure, flow, resistivity of described pure water cooler, and changes each on-line parameter into 4～20mA standard analog amount signal or bound switching value signal is sent to controller in real time;
Described control system is established redundant instrument to supply water temperature, chilled water resistivity, pressure of supply water, four important parameter monitorings of cooling water flow, and heat is equipped with each other, prevents because described control system instrument fault causes thyristor valve to be stopped transport; Send out early warning and alarming when any instrument indication value surpasses the early warning limit value in the redundant instrument, remind the operations staff in time to handle; Just send out tripping alarm when two instrument indication values are all above the tripping operation limit value in the redundant instrument, prevent wrong report;
Controller adopts Programmable Logic Controller PLC, is made up of CPU module, interface module, digital quantity input module, digital quantity output module, analog quantity load module, analog output module and communication module;
Described control system controller CPU is made Redundancy Design; Form by CPU A and CPU B, realize soft redundancy by configuration between CPU A and the CPU B; Under the usual condition, CPUA is as master controller, between CPU B and the CPUA by the MPI bus transfer data, also image data on the on-the-spot I/O module of CPU B simultaneously, but CPU B does not export control command; In case CPU A breaks down, CPU B can take over the work of described control system master controller immediately, and system does not have the normal operation in disturbance ground; CPU A enters stand-by state automatically after maintenance is good;
Interface module is used to connect each frame of Programmable Logic Controller S7-300, is mainly used in the Redundancy Design of CPU;
Digital quantity input module is used to gather each electromechanical equipment operation, malfunction and sampled measurements system each bound switching value signal and operational order;
The digital quantity output module is used to control the start and stop of each electromechanical equipment;
The analog quantity load module is used to gather 4～20mA standard analog amount signal of each on-line parameter of sampled measurements system;
Analog output module is used for the operation result of controller is converted to standard analog amount signal, the frequency lifting of control of conversion device, thus change the air radiator rotation speed of fan, change the system radiating amount;
Communication module is used for system alarm signal, equipment running status and on-line parameter are converted to serial data, arranges communications protocol by both sides and is uploaded to host computer;
Man-machine interface is accepted operating personnel's operational order with each electromechanical equipment running status of graphics mode display system and each real-time monitoring parameter; Establish the operation picture page, the parameter setting page, current page fault, the historical record page on the man-machine interface, empty the record page and help the page.
2. control system of hermetic circulating type pure water cooling device for thyristor valve set according to claim 1 is characterized in that: each electromechanical equipment distribution of described pure water cooler is all established short-circuit protection, overload protection and o-volt protection; O-volt protection is realized by contactor or relay; Three phase electric machine short-circuit protection, overload protection are realized by the adjustable fuser motor of band short circuit, overload protection and rated current; The monophase machine short-circuit protection is realized that by isolating switch overload protection is realized by electrothermal relay.
3. control system of hermetic circulating type pure water cooling device for thyristor valve set according to claim 1, it is characterized in that: controller changes according to deviation between current supply water temperature and target temperature setting value, after carrying out the PID computing, export an analog quantity and give frequency converter, frequency converter is according to the increase of this signal/reduce to come raising frequency/frequency reducing, the control rotation speed of fan, thus the system radiating amount changed, accurately control supply water temperature.
4. control system of hermetic circulating type pure water cooling device for thyristor valve set according to claim 1 is characterized in that: during described control system standby mode and upper machine communication stop, during mode of operation and upper machine communication open-minded.
5. control system of hermetic circulating type pure water cooling device for thyristor valve set according to claim 1, it is characterized in that: the temperature control of described control system is controlled by low-temperature zone, middle-temperature section, high temperature section segmentation, and realizes temperature adjustment by the interlock of blower fan, frequency converter, electric T-shaped valve and electric heater;
Low-temperature zone: when supply water temperature is in low-temperature zone, the electric T-shaped valve complete shut-down, excision outdoor air heating radiator cooling circuit makes system radiating amount minimum; As this moment supply water temperature continue to descend, when dropping to setting value, start electric heater, prevent that supply water temperature is low excessively and cause thyristor valve to damage; Or supply water temperature starts electric heater when dropping near dew point, prevents the thyristor valve body dewfall;
Middle-temperature section: when supply water temperature is in middle-temperature section, changes the heat eliminating medium air radiator flow of flowing through by the ON/OFF electric T-shaped valve, thereby change the system radiating amount, supply water temperature is stabilized in the electric T-shaped valve operating temperature range;
High temperature section: when supply water temperature is in high temperature section, electric T-shaped valve standard-sized sheet, the heat eliminating medium air radiator cooling circuit of all flowing through, the system radiating amount is regulated in conjunction with the fan frequency conversion speed governing by control fan starting platform number.
6. control system of hermetic circulating type pure water cooling device for thyristor valve set according to claim 1 is characterized in that: the communication protocol Physical layer is deferred to RS485 serial communication interface standard, and transmission medium is a shielded twisted-pair cable; The serial communication data are that unit transmits with the frame, and every frame data byte length determines that as required all bytes all send with ASCII character and receive; Each byte sends with the form of start bit, information bit, position of rest, check bit; Described control system externally sent continuously with the fixed cycle, and each cycle externally sends 1 frame data, and every of standby character is 0.
7. control system of hermetic circulating type pure water cooling device for thyristor valve set according to claim 1, it is characterized in that: described control system is carried out leak protection according to the surge tank liquid level, set up database by CPU level value is carried out timing sampling and comparison, judge the leakage of described pure water cooler with the speed of liquid level decline, leakage is divided into little seepage and two grades of gross leak, carries out early warning or tripping operation respectively; CPU avoids the generation of reporting by mistake to because the situation of the unusual change of the liquid level that temperature decrease causes compares and screens simultaneously.
8. control system of hermetic circulating type pure water cooling device for thyristor valve set according to claim 1 is characterized in that: electric heater starts when supply water temperature is lower than the setting limit value, and supply water temperature is low excessively to cause thyristor valve body to damage to avoid; Supply water temperature is during near valve Room dew point, the electric heater force start.
9. control system of hermetic circulating type pure water cooling device for thyristor valve set according to claim 1 is characterized in that: described control system fault alarm can be uploaded host computer; Report to the police with warning message and two kinds of forms of alerting signal; Warning message is reported to the police on the OP of man-machine interface guidance panel with the information bar form; Alerting signal occurs with the form of sound and light alarm; Warning message and alerting signal all can be uploaded host computer, and warning message is uploaded by serial ports, and alerting signal is uploaded with dry contact.
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