CN103940165A - Heat pump control system based on DCS and control method thereof - Google Patents
Heat pump control system based on DCS and control method thereof Download PDFInfo
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- CN103940165A CN103940165A CN201410166143.XA CN201410166143A CN103940165A CN 103940165 A CN103940165 A CN 103940165A CN 201410166143 A CN201410166143 A CN 201410166143A CN 103940165 A CN103940165 A CN 103940165A
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Abstract
The invention discloses a heat pump control system based on a DCS and a control method thereof, relates to the technical field of heat pump control, and aims to solve the problems that control can not be conveniently carried out through an existing heat pump control system and the existing heat pump control system is poor in reliability. By means of the heat pump control system based on the DCS and the control method thereof, physical quantities such as the temperature, the flow, the liquid level and the pressure can be monitored in real time; a CPU carries out calculation according to the monitored temperature and a received temperature control signal to determine the working state of each heat pump, and sends a heat pump control signal to a heat pump system through an analog quantity output card and a digital quantity output card to achieve automatic control over the heat pump system. The control method is more convenient and faster to implement than a PLC control system, the change of each physical parameter in the heat pump system can be monitored in real time, a complex control process can be achieved, and the control method has higher reliability. Furthermore, the DCS is easy to develop and convenient to operate, and programming can be easily achieved through configuration software. The heat pump control system based on the DCS and the control method thereof are suitable for systems for recycling waste heat of power plant circulating cooling water.
Description
Technical field
The present invention relates to heat pump control technology field.
Background technology
Heat pump is as the capital equipment of circulating cooling water of power plant waste heat recycling system, existing heat pump control all adopts PLC production process is controlled and monitored, because of PLC industrial technology and equipment characteristic, thermal technology personnel are difficult to the control program optimization of modifying, and cannot carry out safety-optimized operation according to power plant's actual operating state.Adjusting efficiency and the load of operation of heat pump needs professional to operate at heat pump body control panel, and processing problem not in time, and there is no communication and coordinates and control between many heat pumps.Heat pump only monitors by communication apparatus as its running status of important production equipment and real-time parameter, does not have redundance unit, and to power plant safety, economical operation is extremely disadvantageous for this.
Summary of the invention
The object of the invention is in order to overcome existing control system for heat pump control inconvenience, the problem of poor reliability, provides a kind of control system for heat pump based on DCS (scattered control system) and the control method of this system.
Control system for heat pump based on DCS of the present invention comprises human-computer interaction device, network communication system and distributed process control station;
Each control station in distributed process control station includes analog measurement circuit, switching value input card, CPU, analog output unit and digital output card;
Described analog measurement circuit comprises analog signal input card and thermal resistance measurement card, described analog signal input card is used for gathering steam flow, circulating water flow, drain trap liquid level and extraction pressure information, thermal resistance measurement card is for collecting temperature information, and described temperature information comprises inlet temperature and outlet temperature, the inlet temperature of hot net water and the temperature of outlet temperature and low-pressure pumping steam of recirculated water;
Flow signal, liquid level signal and the pressure signal of described analog signal input card are sent to CPU by I/O bus, the temperature signal of thermal resistance measurement card is sent to CPU by I/O bus, the analog quantity control signal of CPU is sent to the heat pump being made up of many heat pumps by analog output unit, the discrete control signal of CPU is sent to heat pump by digital output card;
Described human-computer interaction device comprises engineer station, operator station, historical station and operating office;
Described engineer station, operator station, historical station and operating office all carry out transfer of data by the CPU of network communication system and distributed process control station.
The control method of the control system for heat pump based on DCS of the present invention comprises the following steps:
Detecting step: for detecting in real time duty, hot net water outlet temperature, heating network entry temperature, circulating water outlet temperature, Inlet Temperature of Circulating Water, extraction temperature and the drainage pump water level of each heat pump, and receiving target temperature;
Calculation procedure: for calculate the actual total load of heat pump according to the duty of each heat pump, calculate target total load according to heat supply network delivery port temperature, the target temperature that receives;
Target duty determining step: for determine the target duty of each heat pump according to the actual total load of heat pump and target total load;
Control step: for sending state control signal to each heat pump.
The engineer station of the control system for heat pump based on DCS of the present invention is used for realizing the logic control between equipment and display frame is changed, operator station is for the start and stop of remote control field apparatus, historical station is used for recording all monitored data, and operating office is used for realizing the information exchange between control system for heat pump and the external system based on DCS.Utilize the control system for heat pump based on DCS of EDPF-NT+ system configuration to realize monitoring and the control of the information such as state and physical parameter to each equipment in control system for heat pump.Network communication system is mainly responsible for information and the data transmission in control procedure.Distributed process control station is responsible for information gathering and data processing in heat pump technical process.In system, the collection of analog quantity information is to complete by the analog signal input card in EDPF-NT+ system, the signal of telecommunication that corresponding transmitter converts the signals such as the pressure collecting, flow, liquid level to 4～20mA sends on analog signal input card, and then analog signal input card converts the electrical signal to data signal and sends in CPU.Thermal resistance measurement card is measured the resistance of thermal resistance, and converts this resistance to data signal and send in CPU.The on off state collection of other each heat pump completes by switching value input card, and input signal is dry contact signal.The CPU that the signal collecting is sent to the control system for heat pump based on DCS by I/O bus processes, and then CPU sends corresponding instruction to system.The output state of control system is set and is completed by analog output unit and digital output card, and output state is set the setting and the start and stop of each heat pump etc. that comprise the each physical parameter in system.The physical quantity that this control system for heat pump is mainly monitored has: temperature, flow, liquid level and pressure.Main control loop comprises temperature control loop and liquid level control loop.In control system for heat pump, there are a lot of important monitoring points, for example: the entrance and exit temperature of the load of heat pump, the entrance and exit temperature of recirculated water, hot net water, the low temperature and pressure that draws gas etc. that adds.CPU is sent to executing agency by the analog quantity after calculating by analog output unit, makes executing agency produce the action of expection; Digital quantity is sent to executing agency by digital output card, respective execution mechanisms is opened or closed.Whole control procedure produces a desired effect by collection, computing and execution three steps.It is a kind of than the control mode of PLC control system more convenient and quicker that above-mentioned control system can provide, and in energy Real-Time Monitoring heat pump, the situation of change of each physical parameter, can realize more complicated control law, has higher reliability.In addition, the exploitation of DCS software section easily, simple, easy to operate with configuration software programming.In heat pump, can easily realize the supervision to each process variables, to temperature, flow, the control of the physical parameters such as liquid level.
The control method of the control system for heat pump based on DCS of the present invention, in energy Real-Time Monitoring heat pump, the situation of change of each physical parameter, can realize more complicated control procedure, has higher reliability.In addition, DCS system development is easy, simple, easy to operate with configuration software programming.In heat pump, can easily realize the supervision to each process variables, to temperature, flow, the control of the physical parameters such as liquid level.
Brief description of the drawings
Fig. 1 is the theory diagram of the control system for heat pump based on DCS described in embodiment one;
Fig. 2 is the theory diagram of the distributed process control station in embodiment one;
Fig. 3 is the structural representation in the front, inside of the switch board in embodiment one;
Fig. 4 is the structural representation at the back side, inside of the switch board in embodiment one.
Detailed description of the invention
Detailed description of the invention one: in conjunction with Fig. 1 to Fig. 4, present embodiment is described, the control system for heat pump based on DCS described in present embodiment comprises human-computer interaction device 1, network communication system 2 and distributed process control station 3;
Distributed process control station 3 comprises analog measurement circuit 3-1, switching value input card 3-2, CPU3-3, analog output unit 3-4 and digital output card 3-5;
Described analog measurement circuit 3-1 comprises analog signal input card 3-1-1 and thermal resistance measurement card 3-1-2, described analog signal input card 3-1-1 is used for gathering steam flow, circulating water flow, drain trap liquid level and extraction pressure information, thermal resistance measurement card 3-1-2 is for collecting temperature information, and described temperature information comprises inlet temperature and outlet temperature, the inlet temperature of hot net water and the temperature of outlet temperature and low-pressure pumping steam of recirculated water;
Flow signal, liquid level signal and the pressure signal of described analog signal input card 3-1-1 are sent to CPU3-3 by I/O bus, the temperature signal of thermal resistance measurement card 3-1-2 is sent to CPU3-3 by I/O bus, the analog quantity control signal of CPU3-3 is sent to the heat pump being made up of many heat pumps by analog output unit 3-4, the discrete control signal of CPU3-3 is sent to heat pump by digital output card 3-5;
Described human-computer interaction device 1 comprises engineer station 1-1, the 1-2 of operator station, historical station 1-3 and operating office 1-4;
Described engineer station 1-1, the 1-2 of operator station, historical station 1-3 and operating office 1-4 all carry out transfer of data by the CPU3-3 of network communication system and distributed process control station 3.
DCS in present embodiment adopts EDPF-NT+ control system.For the technical process of this heat pump, and I/O counts, and we are that the DCS system hardware of heat pump configuration is if following table 1 is to as shown in table 4.
The hardware configuration at table 1 engineer station, operator station and historical station
| Title | Model | Quantity |
| Industrial network switch | KIEN3016-2M, 2 light 16 electricity | 2 |
| Preset cable | ? | 1 cover |
The hardware configuration of table 2 network communication system
| Title | Model | Quantity |
| SIS Interface Station computer | Duo double-core E5200/2.5GHz/2GRAM/500GB | 1 |
| Individual event isolation gateway | Peace is every Type B | 1 |
| Redundant network communication controller | 100M | 1 |
| LCD display | S22A300B | 1 |
The hardware configuration of table 3 distributed process control station
Table 4 other system equipment
| Title | Size | Quantity |
| Control rack | 800 wide × 2000 height × 600 are dark | 2 |
| Rack is controlled in expansion | 800 wide × 2000 height × 601 are dark | 1 |
| Electric power network cabinet | 800 wide × 2000 height × 600 are dark | 1 |
Engineer station 1-1 is used for realizing the logic control between equipment and display frame is changed, the 1-2 of operator station is for the start and stop of remote control field apparatus, historical station 1-3 is used for recording all monitored data, and operating office 1-4 is used for realizing the information exchange between control system for heat pump and the external system based on DCS.
Utilize the control system for heat pump based on DCS of EDPF-NT+ system configuration to realize monitoring and the control of the information such as state and physical parameter to each equipment in control system for heat pump.Main information and the data transmission of being responsible in control procedure of network communication system 2.Distributed process control station 3 is responsible for information gathering and data processing in heat pump technical process.In system, the collection of analog quantity information is to complete by the analog signal input card 3-1-1 in EDPF-NT+ system, the input signal of its reception is the current signal of 4-20mA or the voltage signal of 1-5V, the collection of temperature completes by thermal resistance measurement card 3-1-2, and input signal is resistance signal.The on off state collection of other each heat pump completes by switching value input card 3-2, and input signal is dry contact signal.The CPU3-3 that the signal collecting is sent to the control system for heat pump based on DCS by I/O bus processes, and then CPU3-3 sends corresponding instruction to system.The output state of control system is set and is completed by analog output unit 3-4 and digital output card 3-5, and output state is set the setting and the start and stop of each heat pump etc. that comprise the each physical parameter in system.The physical quantity that this control system for heat pump is mainly monitored has: temperature, flow, liquid level and pressure.Main control loop comprises temperature control loop and liquid level control loop.In control system for heat pump, there are a lot of important monitoring points, for example: entrance and exit temperature, the temperature and pressure of low-pressure pumping steam etc. of the load of heat pump, the entrance and exit temperature of recirculated water, hot net water.CPU3-3 is sent to executing agency by the analog quantity after calculating by analog output unit 3-4, makes executing agency produce the action of expection; Digital quantity is sent to executing agency by digital output card 3-5, respective execution mechanisms is opened or closed.Whole control procedure produces a desired effect by collection, computing and execution three steps.
EDPF-NT scattered control system main performance index is as follows:
(1) data high-speed highway communication network
Latticed form: rapid-exchange version EPA;
Communication standard: TCP/IP;
Communication speed: 100/1000Mb/s;
Network medium: optical fiber/UTP/STP;
Topological structure: star-like/ring-like/tree type/bus-type, flattening peer-type network structure;
Communication network redundancy: the concurrent redundancy/multiplex of two nets redundancy (ring network structure, self-cure type network structure that multiple spot crossing redundancy is fault-tolerant);
Distributing real-time data bank total capacity > 65535 × 100 points;
Network data rate of load condensate: < 10%;
System network enabled nodes a: station, 100 territory × 253;
(2) distributed process control station 3
CPU3-3: low-power consumption Pentium500MHz;
Random access memory capacity: 256MB;
Non-volatile memory capacity: 256MB (ferroelectric memory);
Redundant fashion: hot backup redundancy;
The hard real-time kernel of operating system: LINUX;
Control disposal ability: control page/each DPU for 9999;
The fastest treatment cycle of system: 20ms;
Local real time data storage capacity≤16000 point/each DPU;
(3) I/O module
Analog input precision: be all better than 0.1%;
Environment temperature-20 DEG C～65 DEG C of humidity 10%～95% (not dewfall);
Local I/O and remote I/O are completely compatible;
SOE resolution ratio≤1ms;
I/O module Electro Magnetic Compatibility: IEC-EMC certification;
(4) man-machine interface and interface
Screen resolution 1600 × 1280 or higher;
Picture refreshing time < 1s;
Picture data refresh time < 0.5s;
(5) reliability
Network multiple redundancy, DPU redundancy, power supply redundancy, important I/O redundancy;
MTBF > 200,000 hours;
Availability > 99.95%.
It is a kind of than the control mode of PLC control system more convenient and quicker that the control system for heat pump based on DCS described in present embodiment can provide, the situation of change of each physical parameter in energy Real-Time Monitoring heat pump, can realize more complicated control law, there is higher reliability.In addition, DCS system development is easy, simple, easy to operate with configuration software programming.In heat pump, can easily realize the supervision to each process variables, to temperature, flow, the control of the physical parameters such as liquid level.The more important thing is that DCS has better man-machine interface, friendly man-machine interface can make engineer and operator's work more light.
Detailed description of the invention two: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described analog signal input card 3-1-1 is NT200-AI16.
Detailed description of the invention three: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described thermal resistance measurement card 3-1-2 is NT200-RTD16.
Detailed description of the invention four: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described switching value input card 3-2 is NT200-DI16.
Detailed description of the invention five: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described analog output unit 3-4 is NT200-AO8.
Detailed description of the invention six: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described digital output card 3-5 is NT200-RB (AC/DC).
Detailed description of the invention seven: in conjunction with Fig. 1 to Fig. 4, present embodiment is described, present embodiment is the control method of the control system for heat pump based on DCS described in embodiment one, said method comprising the steps of:
Detecting step: for detecting in real time duty, hot net water outlet temperature, heating network entry temperature, circulating water outlet temperature, Inlet Temperature of Circulating Water, extraction temperature and the drainage pump water level of each heat pump, and receiving target temperature;
Calculation procedure: for calculate the actual total load of heat pump according to the duty of each heat pump, calculate target total load according to heat supply network delivery port temperature, the target temperature that receives;
Target duty determining step: for determine the target duty of each heat pump according to the actual total load of heat pump and target total load;
Control step: for sending state control signal to each heat pump.
The control method Real-Time Monitoring heat supply network water inlet temperature of the control system for heat pump based on DCS described in present embodiment, 0 DEG C of delivery port temperature T, circulating water intake temperature, outlet temperature and extraction pressure etc., when control system receives when the outlet temperature of hot net water is adjusted to the order of T DEG C, control system compares T0 and T, determine the target total load of heat pump according to the duty of T0 and T difference and each heat pump, determine again the target duty of every heat pump according to target total load, and transmit control signal to every heat pump, the actual total load of heat pump is equated with target total load, and then the outlet temperature that makes hot net water reaches target temperature T DEG C.Other temperature that detect in detecting step and water level signal are used for monitoring the duty of heat pump, and system are debugged foundation is provided for staff.
Now illustrate the control procedure of control system.Whole heat pump comprises 5 heat pumps, now heat pump total load is 55% (i.e. 2 heat pump standard-sized sheets, 1 heat pump open 75%, 2 heat pump full cut-ofves), 50 DEG C of hot net water inlet temperatures, 80 DEG C of outlet temperatures, 40 DEG C of circulating water intake temperature 60 C, outlet temperatures, 200 DEG C of extraction pressure 1.5MPa temperature.Receiving now heat supply network scheduling requires the outlet temperature of hot net water to bring up to 100 DEG C, when heat pump is received after instruction, 80 DEG C of the analog signals hot net water outlet temperatures constantly gathering are compared by process controller with 100 DEG C of orders, find that standing state does not reach requirement, the total load of heat pump need to be brought up to 65% (i.e. 3 heat pump standard-sized sheets, 1 heat pump opens 25%, a heat pump full cut-off), by computing, utilize analog output module that the 3rd heat pump is opened into standard-sized sheet gradually, give the 4th heat pump open command by switching value module, and by analog output module, the 4th heat pump is opened to 25%, the outlet temperature of hot net water has reached 100 DEG C, reach automatically the requirement of heat supply network scheduling.
The control method of the control system for heat pump based on DCS described in present embodiment, in energy Real-Time Monitoring heat pump, the situation of change of each physical parameter, can realize more complicated control procedure, has higher reliability.In addition, DCS system development is easy, simple, easy to operate with configuration software programming.In heat pump, can easily realize the supervision to each process variables, to temperature, flow, the control of the physical parameters such as liquid level.
Claims (7)
1. the control system for heat pump based on DCS, is characterized in that: it comprises human-computer interaction device (1), network communication system (2) and distributed process control station (3);
Each control station in distributed process control station (3) includes analog measurement circuit (3-1), switching value input card (3-2), CPU (3-3), analog output unit (3-4) and digital output card (3-5);
Described analog measurement circuit (3-1) comprises analog signal input card (3-1-1) and thermal resistance measurement card (3-1-2), described analog signal input card (3-1-1) is for gathering steam flow, circulating water flow, drain trap liquid level and extraction pressure information, thermal resistance measurement card (3-1-2) is for collecting temperature information, and described temperature information comprises inlet temperature and outlet temperature, the inlet temperature of hot net water and the temperature of outlet temperature and low-pressure pumping steam of recirculated water;
Flow signal, liquid level signal and the pressure signal of described analog signal input card (3-1-1) is sent to CPU (3-3) by I/O bus, the temperature signal of thermal resistance measurement card (3-1-2) is sent to CPU (3-3) by I/O bus, the analog quantity control signal of CPU (3-3) is sent to by analog output unit (3-4) heat pump being made up of many heat pumps, and the discrete control signal of CPU (3-3) is sent to heat pump by digital output card (3-5);
Described human-computer interaction device (1) comprises engineer station (1-1), operator station (1-2), historical (1-3) and the operating office (1-4) of standing;
Described engineer station (1-1), operator station (1-2), historical station (1-3) and operating office (1-4) all carry out transfer of data by the CPU (3-3) of network communication system and distributed process control station (3).
2. the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described analog signal input card (3-1-1) is NT200-AI16.
3. the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described thermal resistance measurement card (3-1-2) is NT200-RTD16.
4. the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described switching value input card (3-2) is NT200-DI16.
5. the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described analog output unit (3-4) is NT200-AO8.
6. the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described digital output card (3-5) is NT200-RB.
7. the control method of the control system for heat pump based on DCS claimed in claim 1, is characterized in that: said method comprising the steps of:
Detecting step: for detecting in real time duty, hot net water outlet temperature, heating network entry temperature, circulating water outlet temperature, Inlet Temperature of Circulating Water, extraction temperature and the drainage pump water level of each heat pump, and receiving target temperature;
Calculation procedure: for calculate the actual total load of heat pump according to the duty of each heat pump, calculate target total load according to heat supply network delivery port temperature, the target temperature that receives;
Target duty determining step: for determine the target duty of each heat pump according to the actual total load of heat pump and target total load;
Control step: for sending state control signal to each heat pump.
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| CN103940165B (en) | 2015-12-09 |
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