CN111308951A - Water-free directly-heated type electric heating control system based on campus area heating - Google Patents
Water-free directly-heated type electric heating control system based on campus area heating Download PDFInfo
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- CN111308951A CN111308951A CN201911333659.8A CN201911333659A CN111308951A CN 111308951 A CN111308951 A CN 111308951A CN 201911333659 A CN201911333659 A CN 201911333659A CN 111308951 A CN111308951 A CN 111308951A
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- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/058—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
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Abstract
The invention provides an anhydrous direct-heating type electric heating control system based on campus area heating, which comprises: the electric heater comprises a plurality of single-chip microcomputer field controllers connected with the electric heater, a PLC control system used for sending temperature instructions to the single-chip microcomputer field controllers, an industrial personal computer control system used for modifying parameters of the PLC control system, and a cabinet used for overall experiment operation. The control system of the invention utilizes a reasonable and scientific software algorithm to divide the heat load grade according to the working property and the heating demand of a room, further determines the given temperature according to the heat load grade, reduces the unnecessary consumption of electric energy by a method of optimizing the temperature given value, and realizes the effects of energy conservation, environmental protection and emission reduction; the equipment has the functions of teaching, experiment, scientific research and practicality.
Description
Technical Field
The invention relates to the technical field of campus area heating control and experiments, in particular to a water-free directly-heated electric heating control system based on campus area heating.
Background
In the existing campus area, in order to achieve the effects of energy conservation, environmental protection and emission reduction, the electric heater is popularized and used for heating, but in an electric heating control system, the environment temperature suitable for human life and work is often adopted as the only temperature set value, so that the problem of large energy consumption is caused, and the electric energy is wasted meaningless.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a water-free directly-heated electric heating control system based on campus area heating.
The invention is realized by the following technical scheme:
the invention provides an anhydrous direct-heating type electric heating control system based on campus area heating, which comprises: single chip field controller: the single-chip microcomputer field controllers are correspondingly connected with the electric heaters positioned in the heating areas, and the single-chip microcomputer field controllers are all connected with a 485 bus of the same network;
a PLC control system: the PLC control system sends a temperature set value to the single-chip microcomputer field controller through an Ethernet, and collects and applies state information of the single-chip microcomputer field controller;
industrial control machine control system: the industrial personal computer control system sends a working instruction to the PLC control system, modifies corresponding parameters and receives temperature and state data information of the single chip microcomputer controller;
the equipment cabinet: the back of the cabinet is detachably connected with a dust guard, the upper half part of the front of the cabinet is distributed with a touch control screen connected with the PLC control system and a monitoring display screen connected with the industrial control system, and the lower half part of the cabinet is provided with a plurality of spare part boxes; the testing device also comprises a plurality of experimental grooves which are arranged on the front surface of the cabinet and used for placing the single chip microcomputer field controller.
Preferably, each single-chip microcomputer field controller is an independent device composed of a C8051 single-chip microcomputer system.
Preferably, the PLC control system exchanges data with the single-chip microcomputer field controllers in a polling scanning mode.
Preferably, an S7-200 temperature control PLC, an S7-200 communication PLC and an S7-300PLC which are connected with the Ethernet bus are arranged in the cabinet.
Preferably, the electric heater adopts a pulse width type power regulation method to control the temperature.
Preferably, the PLC control system adopts a PID algorithm for calculation, and sends a temperature setting value to the single chip microcomputer controller according to the PID algorithm.
The control system of the invention utilizes a reasonable and scientific software algorithm to divide the heat load grade according to the working property and the heating demand of a room, further determines the given temperature according to the heat load grade, reduces the unnecessary consumption of electric energy by a method of optimizing the temperature given value, and realizes the effects of energy conservation, environmental protection and emission reduction; the equipment has the functions of teaching, experiment, scientific research and practicality.
Drawings
Fig. 1 is a schematic structural diagram of a cabinet of an anhydrous direct-heating type electric heating control system based on campus area heating according to an embodiment of the present invention;
fig. 2 is a schematic view of a topological structure of an anhydrous direct-heating type electric heating control system based on campus area heating according to an embodiment of the present invention;
fig. 3 is a real-time data page diagram of an anhydrous direct-heating type electric heating control system based on campus area heating according to an embodiment of the present invention;
fig. 4 is a load level data display diagram of the waterless directly-heated electric heating control system based on campus area heating according to the embodiment of the present invention;
fig. 5 is a pulse width type power adjustment method of an anhydrous direct-heating type electric heating control system based on campus area heating according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Firstly, in order to facilitate understanding of the waterless directly-heated electric heating control system based on campus area heating provided by the embodiment of the application, an application scenario of the waterless directly-heated electric heating control system based on campus area heating provided by the embodiment of the application is explained, the waterless directly-heated electric heating control system based on campus area heating provided by the embodiment of the application replaces a water circulation heating method adopted in a conventional campus area, thermal load grades of the campus area heating are reasonably divided according to working attributes and heating requirements of rooms, a given temperature of the campus area heating is further determined according to the thermal load grades, and unnecessary consumption of electric energy is avoided.
Referring to fig. 1-2 together, an embodiment of the present invention provides an anhydrous direct-heating type electric heating control system based on campus area heating, including: cabinet 1, this cabinet 1 be horizontal cabinet body or vertical cabinet body all can, and cabinet 1 is located the control laboratory for be located the radiating temperature of the electric heater of a plurality of heating regions through ethernet remote control, and be in order to supply experiment teaching to use.
When a plurality of electric heaters in different areas of specific remote control give off different temperatures, adopt a plurality of singlechip field controller 3 in this system: the single-chip microcomputer field controllers 3 are correspondingly connected with electric heaters positioned in a plurality of heating areas, and the single-chip microcomputer field controllers 3 are all connected with a 485 bus of the same network; each single chip microcomputer field controller 3 is an independent device composed of a C8051 single chip microcomputer system. The single chip microcomputer field controller 3 is used as an independent hardware device and applied to the bottom layer, and the core of the single chip microcomputer field controller is used for controlling the temperature of the control point to which the single chip microcomputer field controller belongs, so that the control requirement of cold seasons on the environment temperature is met. When in formal use, the system is arranged on a control site and controls the affiliated control point in real time; when the multifunctional experiment cabinet is used for experiments and researches, an experiment groove for placing the single chip microcomputer controller can be formed in the front of the cabinet 1, so that students can operate intuitively.
The single chip microcomputer field controller 3 is internally composed of a control part and a power part, and no strong electric coupling exists between the control part and the power part, so that students can conveniently perform safe experimental operation under the condition that the machine body is not opened. The single-chip on-site controller 3 is a common device in the prior art, and the wiring manner thereof is not described herein.
When the temperature of the electric heater is controlled, the temperature is regulated and controlled by the cabinet 1 after the corresponding assembly of the singlechip controller is finished; when the intelligent cabinet is specifically arranged, the dust-proof plate 2 is detachably connected to the rear part of the cabinet 1, and an S7-200 temperature control PLC, an S7-200 communication PLC and an S7-300PLC which are connected with an Ethernet bus are arranged in the cabinet 1 to form a whole set of PLC control system, and the external lead wire can be used for carrying out experiment or research operation by utilizing the lower wiring terminal; and the lower part of the cabinet 1 is provided with three spare part boxes 6, and printers, industrial personal computers, necessary tools and the like are respectively arranged in the three spare part boxes 6.
The PLC control system sends the temperature set value to the single chip microcomputer field controller 3 through the Ethernet, collects and uses the state information of the single chip microcomputer field controller 3, and exchanges data with the single chip microcomputer field controllers 3 in a polling scanning mode.
The front part of the cabinet 1 is provided with a touch control screen 5 connected with a PLC control system and a monitoring display screen 4 connected with an industrial control system, the industrial control system sends a working instruction to the PLC control system, corresponding parameter modification is carried out, and meanwhile, temperature and state data information of the single chip microcomputer controller is received.
The system takes each electric heater for campus electric heating as a control object, takes the heating temperatures of different areas of different rooms of a campus building as control parameters, and forms a single chip microcomputer field controller 3, a PLC control system and an industrial personal computer control system from bottom to top, thereby realizing the civil building electric heating temperature control system with decentralized control and centralized management. The system is developed to replace the traditional water heating system, and the effects of energy conservation, environmental protection and emission reduction are realized by using a reasonable and scientific software algorithm. According to the contract requirement, the equipment has the functions of teaching, experiment, scientific research and practicality.
Referring to fig. 2, fig. 2 is a schematic view of a topology structure of the system, in which the single chip field controller 3 is an independent device composed of a C8051 single chip system, and may be installed on the cabinet 1 in an embedded manner for experimental debugging, or may be installed on a control field independently for practical application and operation. In addition, the single-chip microcomputer field controller 3 of the control room is realized by using Siemens S7-200smart, and the experimental content of students is increased. The single-chip microcomputer field controllers 3 in the same building are all connected to a 485 bus of the same network and are communicated with a Siemens S7-300PLC of a control layer of the building through a Modbus protocol. And the PLC is used as a Modbus master station and exchanges data with each extension set in a polling scanning mode.
When the single-chip microcomputer field controller 3 is installed at other places for use, the original power wiring needs to be subjected to insulation treatment. The singlechip field controller 3 is mainly operated and set through four keys and displayed through a sixteen-character liquid crystal screen, and the display format is as follows.
The key definition and operation commands are as follows:
the PLC control system carries out algorithm calculation, sends a temperature set value and other commands to the single chip microcomputer field controller 3 according to corresponding algorithms, and also collects and uses state information of the single chip microcomputer field controller 3. PLC control systems of different buildings are connected to the Ethernet bus and are in data communication with the industrial personal computer control system.
The industrial control computer control system comprises a monitoring computer, and the task of the industrial control computer control system is to send a work instruction to the PLC control system, modify related parameters and check real-time data and information such as the temperature and the state of the single chip microcomputer field controller 3.
The electric heater heats and warms with the heat effect of electric energy, and the temperature of heating has directly been decided to how much of the electric energy that provides, and the electric energy of heating and the heat energy of dissipation are in dynamic balance state under the normal condition. The most common power regulation control of the electric heater is 'ping-pong' control, the method is simple and convenient, and the lower return difference can be set compared with a bimetallic strip, but the defect of temperature overshoot can also exist. The phase type power regulation can realize accurate control on temperature, but under the condition that most electric heaters regulate power simultaneously, more harmonic waves are easily generated, and adverse effects are caused on the quality of electric energy. The pulse width type power regulation is based on the speed regulation principle of the direct current motor, the accurate control of the temperature can be realized, and peak interference can be possibly generated on a power grid when most electric heaters regulate power simultaneously. For applications with high control accuracy, the pulse width modulation method is preferred, as shown in fig. 5.
No matter what power adjusting mode, software algorithm is needed to be matched for realizing temperature control. The hysteresis comparison algorithm is a simple and easy-to-use method and is derived from the idea of a comparator. The hysteresis comparison algorithm realized by software can flexibly set both the reference point and the return difference value, and has good convenience compared with a hardware comparator or a bimetallic switch with a physical structure. Furthermore, in order to increase the temperature accuracy and reduce the control oscillation process, a "cascade" control can also be provided with the PID controller mentioned below.
And (4) PID algorithm. PID regulation consists of proportional regulation, integral regulation and differential regulation, and is the most mature and widely applied regulation mode. The essence of PID regulation is that operation is carried out according to the function relation of proportion, integral and differential according to the input deviation value, and the operation result is used for controlling output. In practical application, the structure of the PID can be flexibly changed according to the characteristics and the control requirements of the controlled object, and a part of links are taken to form a control law, such as proportional control, proportional-integral-derivative control and the like.
PID algorithm expression:
a fuzzy control algorithm. Fuzzy control is essentially a non-linear control, and when there are many variables, it is often difficult to describe the system dynamics correctly, so various methods are used to simplify the system dynamics to achieve the purpose of control. The fuzzy controller comprises four parts: (1) and (4) fuzzifying. The main function is to select the input quantity of the fuzzy controller and convert the input quantity into the fuzzy quantity which can be recognized by the system, and (2) the rule base. And establishing a fuzzy rule base according to the experience of human experts. The fuzzy rule base contains a plurality of control rules, and is a key step for transitioning from actual control experience to a fuzzy controller. (3) Fuzzy reasoning. Mainly realizing the reasoning decision based on knowledge. (4) And (5) resolving the blur. The main function is to convert the control quantity obtained by inference into control output. The campus electric heating has few influence variables, so the algorithm is not applied much, but can be used for scientific research.
In the existing electric heating control system, if the same ambient temperature is used as the only temperature set value, heat loads such as warehouses, corridors, washrooms and the like can consume a large amount of energy wastefully, and in addition, the same temperature set value is used at all times at a control point, and the waste of electric energy can be caused. The method is similar to the method for classifying the electric loads, the heat loads of offices, classrooms, laboratories, warehouses, corridors and the like in the campus are classified according to the working attributes and the heating requirements of the rooms, the given temperature of the rooms is determined according to the heat load grades, the unnecessary consumption of electric energy is reduced by optimizing the temperature given value, and the energy conservation and consumption reduction are realized. Load classification referring to the table below, each load level is grouped by location, and by time. Each parameter of specific time and temperature can be set through an upper computer monitoring interface.
When the system is operated specifically, firstly, a master control air switch with leakage protection is turned on, and at the moment, a computer, a printer and an auxiliary power socket can all supply power, so that program editing and various text editing work can be carried out. At this time, the start button is pressed, the under-voltage and over-voltage protection relay is normally closed, and the PLC and the single chip microcomputer field controller 3 start to work when being electrified, so that software downloading and various function debugging work can be carried out. During the period, if the power grid is in overvoltage or undervoltage (the threshold value is set in the intelligent voltmeter) or a test for verifying the function is carried out, the relay automatically cuts off the power to realize voltage limiting protection until the normal voltage is recovered and the system can restore normal work after a stop/reset button is pressed. In addition, each single chip microcomputer field controller 3 is matched with an overcurrent protection air switch, if overcurrent faults exist, power-off protection can be achieved, the fault is eliminated, and the single chip microcomputer field controllers can continue to work after the switches are closed. In the system power-off process, the computer is safely shut down firstly, and then the operation is carried out according to the reverse order. No matter each PLC or each single chip microcomputer field controller 3, when the PLC or the single chip microcomputer field controller is used independently, a communication line of the local machine needs to be disconnected with other networks, and communication programs of other equipment are prevented from interfering with the local machine. In addition, the communication nodes in the same 485 network need to be set to the same baud rate and set to different extension addresses. The IP addresses of the communication nodes in the same Ethernet network are set in the same network segment.
After all the devices are powered on and started, necessary setting is carried out according to the sequence of the bottom layer to the top layer, and then the demonstration content can be carried out. As shown in the figure, the first and second,
with continued reference to fig. 3 and 4, the data of each control point is then entered into the system, which may monitor the computer for operation on a second monitoring screen. Directly inputting the data in a real-time data page, and taking effect immediately; in addition, in the parameter setting screen, parameters can be set for the control points by using the lower part table. The method adopts an index input mode, and after the input, the 'one-key setting' is clicked, so that the parameters take effect. And directly inputting the data in a real-time data page, and taking effect immediately. The real-time data page is shown in figure 3. Next, load class data is required to be set, including working time, working temperature, rest time, rest temperature, etc. of each class, as shown in fig. 4.
After the basic setting is finished, the start and stop operation can be performed by returning to the initial picture. No matter the starting or stopping process, the method adopts a soft starting mode, when the indicator lights flicker, the sequential starting or stopping process is not completely finished, and when the indicator lights are normally on, the sequential starting or stopping process is completely finished.
On the basis of hardware of the existing scientific research device, the invention simplifies modules arranged for facilitating experiment teaching, increases 485 communication modules and isolation type communication repeaters, expands Ethernet components to establish a remote optical fiber communication network, and forms a special DCS system. The installation mode of the hardware is that except that the top monitoring computer is installed in the control room, other hardware components can be directly installed in the cabinet 1.
The system comprises 2S 7-200smart PLCs and 1S 7-300PLC, and additionally comprises a 12-inch touch control screen 5. Wherein the development software of s7-200SMART is STEP 7-MicroWIN SMART. And the development software of the S7-300PLC, the touch screen and the industrial personal computer monitoring interface is TIA portal V15. The PLC control system can develop and design experimental contents according to actual needs.
Scientific research application and software and hardware interfaces. The equipment provides a good hardware platform, and can provide scientific research support for electric heating projects besides function demonstration and experimental operation. Various algorithms can be studied on the basis of the existing experiments.
1) Communication word of existing device
In addition, the PLC temperature controller for the control room comprises a second status word and a second command word in addition to the transceiving word
A method for optimizing a set value in a campus electric heating DCS control system aims at the problem that in the existing electric heating control system, the environment temperature suitable for human life and work is adopted as the only temperature set value, so that a large amount of energy is consumed meaninglessly.
In the current existing electric heating control system, a field controller usually adopts PID closed-loop feedback control based on temperature, when a temperature sensor or a detection channel thereof breaks down, the control output is either saturated or cut off, which can lead the electric heater to be only in an on or off state, so that the room temperature is in two extreme states of high or low, and the heating requirement can not be effectively guaranteed because a given value cannot be tracked. Moreover, when the electric heater or the execution channel has a fault, the temperature control requirement of the room obviously cannot be completed. In addition, when communication channels among the management layer, the control layer and the field control layer break down, the whole DCS control system is in a paralysis state. Aiming at the problems, a fault diagnosis and fault-tolerant control method in an electric heating DCS control system is researched and developed, on the premise of not increasing any hardware cost, the fault diagnosis problems of a detection channel, an execution channel and a communication channel in the electric heating system are solved through a software algorithm, and how to realize temperature control under a fault state, so that the fault self-diagnosis and fault-tolerant control of the electric heating system are realized, the level requirement on system maintenance personnel and the maintenance cost are reduced, and the reliability of the electric heating system is improved.
Besides, according to the research direction of electric heating, the complete set of equipment provided by the platform can be completely designed and developed for relevant theory and application research. On the basis of software of the existing scientific research device, redundant functions for convenient demonstration and teaching are removed, communication programs are optimized, data structures are rebuilt, a software scheme of efficient distributed control is realized, continuous safe and stable fault-free operation of the system is guaranteed, and therefore the practical functional requirements of winter heating are met.
The method has the following effects: 1. the programmable controller of the industrial personal computer is combined with the singlechip, so that the reasonable task of division of labor is clear. 2. Distributed control disperses the risks of large-area shutdown and the like. 3. Centralized management is convenient for realizing unattended operation. 4. The graphical monitoring interface is visual and vivid and is simple to operate. 5. And the time and position personnel multi-parameter load distribution saves energy and reduces consumption. 6. The soft start process and the power failure are combined, so that the impact on a power grid is reduced. 7. The system diagnosis is combined with the extension self-check, so that the fault and the alarm can be quickly positioned and eliminated.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides an anhydrous directly-heated formula electric heating control system based on campus regional heating which characterized in that includes:
single chip field controller: the single-chip microcomputer field controllers are correspondingly connected with the electric heaters positioned in the heating areas, and the single-chip microcomputer field controllers are all connected with a 485 bus of the same network;
a PLC control system: the PLC control system sends a temperature set value to the single-chip microcomputer field controller through an Ethernet, and collects and applies state information of the single-chip microcomputer field controller;
industrial control machine control system: the industrial personal computer control system sends a working instruction to the PLC control system, modifies corresponding parameters and receives temperature and state data information of the single chip microcomputer controller;
the equipment cabinet: the back of the cabinet is detachably connected with a dust guard, the upper half part of the front of the cabinet is distributed with a touch control screen connected with the PLC control system and a monitoring display screen connected with the industrial control system, and the lower half part of the cabinet is provided with a plurality of spare part boxes; the testing device also comprises a plurality of experimental grooves which are arranged on the front surface of the cabinet and used for placing the single chip microcomputer field controller.
2. The anhydrous direct-heating type electric heating control system based on campus area heating of claim 1, wherein each said single chip microcomputer field controller is an independent device composed of a C8051 single chip microcomputer system.
3. The anhydrous direct-heating type electric heating control system based on campus area heating of claim 1, wherein the PLC control system performs data exchange with the plurality of single-chip microcomputer field controllers in a polling scanning manner.
4. The waterless, directly-heated type electric heating control system for warming campus area according to claim 3, wherein there are provided in said cabinet S7-200 temperature control PLC, S7-200 communication PLC and S7-300PLC connected to said Ethernet bus.
5. The waterless direct-heating type electric heating control system based on campus area heating of any one of claims 1 to 4, wherein the electric heater adopts a pulse width type power regulation method for temperature control.
6. The anhydrous direct-heating type electric heating control system based on campus area heating of claim 5, wherein the PLC control system adopts PID algorithm to calculate, and sends instruction to the single chip microcomputer controller according to the temperature setting value of the PID algorithm.
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