CN107270385B - Electromagnetic heating optimization control method - Google Patents

Electromagnetic heating optimization control method Download PDF

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CN107270385B
CN107270385B CN201710452343.5A CN201710452343A CN107270385B CN 107270385 B CN107270385 B CN 107270385B CN 201710452343 A CN201710452343 A CN 201710452343A CN 107270385 B CN107270385 B CN 107270385B
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room temperature
working medium
power converter
temperature
electromagnetic
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CN107270385A (en
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曼苏乐
张秀斌
严志明
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Jiangsu Haneryuan Intelligent Technology Co ltd
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Shanghai Jiaotong University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1096—Arrangement or mounting of control or safety devices for electric heating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D13/00—Electric heating systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/08—Electric heater

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Induction Heating (AREA)

Abstract

The invention relates to an electromagnetic heating optimization control method, which comprises the following steps: step one, arranging an electromagnetic heating detection and control hardware system, wherein the hardware system comprises an electromagnetic heater, a power converter, an alternating current power supply, a controller, a working medium temperature detector and a room temperature sensor; and step two, optimizing the control process, namely adopting double closed-loop control of room temperature feedback and working medium temperature feedback, and determining the on or off of the electromagnetic heating power supply according to the deviation of the room temperature and the working medium temperature and the logic judgment of the room temperature deviation state. Compared with the prior art, the invention has the advantages of saving electric energy and achieving the purpose of effective energy saving under the condition of ensuring that the room temperature of the house meets the requirements of people to achieve comfort.

Description

Electromagnetic heating optimization control method
Technical Field
The invention relates to an optimization control method in the technical field of automation, in particular to an optimization control method for electromagnetic heating.
Background
China has more than 60% of regions, and the temperature is below 0 ℃ in winter. According to incomplete statistics, hundreds of millions of residents and unit users need indoor heating in winter.
The traditional coal-fired boiler heating mode discharges a large amount of smoke dust into air while consuming precious coal resources, and causes serious pollution to the air in cities. Although the oil-fired boiler reduces smoke emission compared with a coal-fired boiler, the pollution of smoke to the atmosphere also has a plurality of problems which are not solved. Meanwhile, the combustion efficiency is reduced and the thermal loss in the transmission process is increased due to the problems of the structure of the coal-fired boiler, the heat dissipation of a pipeline, the heat conduction resistance, delayed discharge and the like, and under the common influence of the factors, the heat efficiency of the whole boiler is quite low (only reaching about 35 percent), which is the maximum defect of the heat value conversion efficiency of the ore fuel. Even if fuel oil or heavy oil is used to replace coal, the effects of improving energy efficiency and environment cannot be fundamentally achieved. Therefore, it is necessary to find clean energy to replace the existing fossil fuel to solve the problem of heating in winter, so as to eliminate the pollution source of haze phenomenon in northern areas of China caused by combustion of the fossil fuel with large occupation.
Although gas heating has certain technical advantages, the gas heating has the characteristics of cleanness, high combustion and heat transfer efficiency, stable equipment operation, quick start and the like. However, the gas boiler also has some disadvantages of flammability, explosiveness and certain toxicity; when the heat pump is started and flame is burnt, the noise is high, and certain pollution problem exists; the gas boiler supplies heat, the average gas consumption per unit area is higher, and the difference of the height is large; the biggest problem is that the price of natural gas tends to rise, which inevitably increases the economic burden of users.
In view of the fact that most towns in China generally implement a grading electricity price charging method, the method provides social public welfare foundation for popularizing and applying electromagnetic heating. Electromagnetic heating also has economic advantages only in the period of the valley load of the power grid. Therefore, the electromagnetic heating and gas combined heating technology is tried to be adopted in many places in China so as to seek the maximization of the technical and economic benefits.
The electromagnetic heating is that a frequency conversion technology is adopted, and under the action of alternating magnetic flux with the frequency of 20-25 kHz, a conductive coil wound outside a metal pipe conductor generates strong eddy current on the conductor, so that the metal conductor is heated, and the temperature is rapidly raised. The electromagnetic heating has the prominent technical characteristics that: the heat conversion efficiency can reach 98 percent, and the energy can be saved by more than 35 percent compared with fuel oil, fuel gas and other electric heating equipment. Certainly, the energy-saving, environment-friendly, safe and reliable air conditioner has better energy saving, environmental protection, safety, reliability, maintenance and other aspects than gas heating.
How to ensure the optimal economic benefit of gas and electromagnetic heating hybrid heating becomes the technical problem which is urgently needed to be solved at present.
The invention provides an optimization control method for further saving electric energy and reducing economic burden of users in high-frequency electromagnetic heating under the condition of low electricity price in a valley charge period of a power grid.
Through literature search, the optimal design method of electromagnetic heating and gas combined heating is elaborated more thoroughly by the 'winter heating optimal design' of Qidakun, Zhangxiang (building Electrical, 2014, 9), but the control method in the electromagnetic heating time period still stays in the stable regulation of the set target temperature, and an optimal control technology is not provided to achieve the effect of further energy saving.
The published technology which is the same as or similar to the present invention is not found through the continuous literature search.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an optimal control method for electromagnetic heating.
The purpose of the invention can be realized by the following technical scheme:
an electromagnetic heating optimization control method comprises the following steps:
step one, arranging an electromagnetic heating detection and control hardware system, wherein the hardware system comprises an electromagnetic heater, a power converter, an alternating current power supply, a controller, a working medium temperature detector and a room temperature sensor;
and step two, optimizing the control process, namely adopting double closed-loop control of room temperature feedback and working medium temperature feedback, and determining the on or off of the electromagnetic heating power supply according to the deviation of the room temperature and the working medium temperature and the logic judgment of the room temperature deviation state.
The specific connection relationship of the hardware system is as follows:
the alternating current power supply converts 50Hz commercial power into high-frequency electromagnetic power through the power converter and outputs the high-frequency electromagnetic power to the electromagnetic heater, and the electromagnetic heater heats working medium water flowing through the electromagnetic heater;
the room temperature sensor is used for sensing the real-time temperature of the space of the heated house and transmitting a room temperature sensing signal to the room temperature sensing signal inlet of the controller;
the working medium temperature detector is used for detecting the real-time temperature of the working medium water flowing through the electromagnetic heater and outputting a working medium water temperature detection signal to the working medium water temperature signal inlet of the controller;
the controller outputs a control instruction signal through the electromagnetic heating optimization control power converter according to the received room temperature sensing signal and the received working medium water temperature signal, controls the on or off of the high-frequency alternating current flowing through the coil of the electromagnetic heater, enables the working medium water flowing through the electromagnetic heater to obtain corresponding heat energy, and correspondingly adjusts the working medium water temperature and the room temperature of the house along with the generation of the corresponding heat energy.
The electromagnetic heater is a cylindrical metal tube, and a conductive coil through which high-frequency alternating current flows is wound on the outer layer of the electromagnetic heater.
The power converter is a power electronic inverter circuit which converts a commercial power 50Hz alternating current power supply into high-frequency alternating electric power. Particularly, an AC/AC conversion circuit is adopted. The AC/AC conversion circuit implements conversion control of output frequency and voltage on the power electronic conversion main circuit through an adjustable pulse width control signal (PWM), so that 50Hz commercial power is directly converted into output with required specific frequency and specific power from 50Hz alternating current input under the action of PWM control.
The second step is specifically as follows:
step 1, making the real-time temperature of the working medium water be t1Room temperature real-time temperature of t2，t1-t2δ is the temperature difference between the two; t is t0Setting room temperature;
step 2, judging whether delta is smaller than epsilon, if delta is smaller than epsilon, executing step 3; otherwise, the temperature and the room temperature of the working medium are continuously detected, and the power converter is in a closed state, namely
P is 0 formula one
Wherein epsilon is a set threshold; p is the power output of the electromagnetic heating power converter;
step 3. determine t2Whether or not t is less than or equal to0If t is2≤t0If yes, executing step 4; otherwise, executing formula one, namely the power converter is continuously in the off state;
step 4. turn on the power converter, i.e.
P＝PfFormula two
Wherein, PfIs the high frequency power output at frequency f;
step 5, continuously detecting the temperature of the working medium water and the room temperature of the house, if t2＞t0Executing the step 6; otherwise, the power converter is continuously in the on state, namely, the formula II is continuously executed;
step 6, judging whether epsilon is equal to delta or not, if delta is equal to epsilon, executing a formula I, namely the power converter is continuously in a closed state, and returning to the step 2; otherwise, the power converter is maintained in the on state, that is, the step 4 is returned to, and the formula two is continuously executed.
The steps 1-6 are repeated in cycles, so that the power converter is always in an on-off alternate state, and therefore, under the condition that the room temperature of a house meets the requirements of people to achieve comfort, the power converter is in an off state to save electric energy, and the purpose of effectively saving energy is achieved.
The method has the power saving effect that
Figure BDA0001322800800000041
Wherein, Tτ＝τ(1)＝τ2-τ1Time period, T, for outputting high frequency power for a mains power converter0Is a room temperature variation period, T0＝τ1-τ0，τ0For the start of the operation of the power converter, tau1For the first turn-on time, τ, after the power converter has been turned off during operation2For the operation of the power converter through the first switching-on time tau1The first closing moment thereafter.
Compared with the prior art, the invention utilizes the electric network valley charge time period, namely the electric network valley charge time period between 22:00 at night and 6:00 in the morning, and adopts an optimized control method to ensure that the electric energy consumption of electromagnetic heating is more saved and the economic cost is lower; at present, the electricity price in the valley charge period of the power grid in most regions is only half of the electricity price in the peak charge period. Therefore, the economic cost of heating is lower than that of gas heating, and the optimal control method of the invention ensures that electromagnetic heating is more economical and feasible and achieves the effect of energy conservation.
Drawings
FIG. 1 is a block diagram of an electromagnetic heating monitoring and controlling hardware system to which the present invention pertains
FIG. 2 is a block diagram of a power converter circuit
FIG. 3 is a control flow chart of the optimal control method for electromagnetic heating
FIG. 4 is a graph showing the real-time temperature of the working medium water, the real-time room temperature of the room and the temperature difference therebetween
In fig. 1, the electromagnetic heating monitoring and controlling hardware system includes: the system comprises an electromagnetic heater 1, a power converter 2, a 50Hz alternating current power supply 3, a power supply controller 4, a working medium water temperature detection 5 and a room temperature sensor 6; the electromagnetic heater 1 includes: the device comprises a conductive coil 11, a metal pipe 12, high-frequency alternating current 13, alternating eddy current 14 and working medium water 15.
In fig. 2, the power converter 2 includes: the main AC/AC conversion circuit 21, the PWM controller 22, the electrical output parameter detector 23, the PWM signal generator 24, the voltage parameter feedback signal 25, the frequency parameter feedback signal 26 and the output port 27 of the power converter 2. The electrical output parameters include frequency and voltage information.
In FIG. 4, t1As the real-time temperature, t, of the working medium2At room temperature, real time, delta ═ t1-t2Is the temperature difference between the two; t is t0Setting room temperature; ε is the decision threshold determined by experiment; pfIs the high frequency power output at frequency f; the curve of vibration around epsilon is an experimental change curve of delta; around t0The curve of the vertical vibration is the room temperature t2The experimental variation curve of (2); tau is0Initial time, tau, for the start-up of an electromagnetic heating monitoring hardware systemiA logic judgment time node of the operation process optimization control method for the electromagnetic heating detection control hardware system is also a time node for turning on or off the power converter 2, and i is 1,2,3.4 and 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
As shown in fig. 1, the electromagnetic heating detection and control hardware system of the present embodiment includes: the device comprises an electromagnetic heater 1, a power converter 2, a 50Hz alternating current power supply 3, a power supply controller 4, a working medium temperature detection 5 and a room temperature sensor 6; wherein, electromagnetic heater 1 includes: the device comprises a conductive coil 11, a metal pipe 12, high-frequency alternating current 13, alternating eddy current 14 and working medium water 15.
The high-frequency alternating current 13 is a high-frequency alternating current with a frequency of 20 kHz.
The working principle of the electromagnetic heating detection and control hardware system is as follows: the alternating current power supply converts a commercial power 50Hz alternating current power supply 3 into 20kHz high-frequency electromagnetic power through a power converter 2 and outputs the high-frequency electromagnetic power to the electromagnetic heater 1, and the electromagnetic heater 1 heats working medium water flowing through the electromagnetic heater. The room temperature sensor 6 is used for sensing the real-time temperature of the space of the heated house and transmitting a room temperature sensing signal to the room temperature sensing signal inlet of the power controller 4; the working medium temperature detection 5 is used for detecting the real-time temperature of the working medium water flowing through the electromagnetic heater 1 and outputting a working medium water temperature detection signal to the working medium water temperature signal inlet of the power controller 4. The power controller 4 controls the on or off of the high-frequency alternating current 13 flowing through the conductive coil 11 of the electromagnetic heater 1 through an electromagnetic heating optimization control method according to the received room temperature sensing signal and the temperature signal of the working medium water, so that the working medium water 15 flowing through the electromagnetic heater 1 obtains corresponding heat energy, and the temperature of the working medium water 15 and the room temperature of a house are correspondingly adjusted.
The electromagnetic heater 1 is a cylindrical metal tube 12, and a conductive coil 11 through which high-frequency alternating current flows is wound on the outer layer of the electromagnetic heater; the high-frequency 20kHz alternating current 13 flowing through the conductive coil 11 forms an alternating eddy 14 in the metal tube 12 so that the working medium water 15 generates heat energy.
The power converter 2 is a main power electronic AC/AC conversion circuit 21 that converts a 50Hz AC power supply from a commercial power supply into a 20Hz high frequency AC power. The AC/AC conversion circuit 21 performs conversion control of output frequency and voltage on the main power electronic conversion circuit 21 through an adjustable pulse width control signal (PWM), so that 50Hz mains supply is directly converted from 50Hz AC input into output with required specific frequency of 20Hz and specific power under the PWM control.
As shown in fig. 2, the operation process of the power converter 2 is: the output parameter detector 23 detects the output parameter of the power converter 2 in real time, the PWM controller 22 decides and outputs a control command according to the received voltage parameter feedback signal 25 and frequency parameter feedback signal 26, controls the pulse width of the PWM signal generator 24 to form a PWM control signal with a specific pulse width, and the AC/AC conversion main circuit 21 determines a corresponding frequency and voltage under the action of the PWM control signal and outputs the frequency and voltage to the output port 27.
The PWM controller 22 is a digital program operator, such as a DSP control module. When the control command changes the PWM pulse width, the frequency of the adjusted PWM signal changes accordingly, and the output frequency and voltage value of the AC/AC conversion main circuit 21 are changed, for example, the frequency is 20kHz and the voltage is 220V. When the PWM controller 22 turns off the output signal of the PWM signal generator 24, the AC/AC converting main circuit 21 is also turned off, i.e., the output power P is 0.
As shown in fig. 3 and 4, the electromagnetic heating optimization method includes the following steps:
step 1, making the real-time temperature of the working medium t1Room temperature real-time temperature of t2，t1-t2δ is the temperature difference between the two; t is t0To set room temperature.
Step 2, if the temperature of epsilon is 30 ℃, if delta is less than epsilon, executing step 3; otherwise, the temperature of the working medium water and the room temperature of the house are continuously detected, and the power converter is in a closed state, namely
P is 0 formula one
Step 3, if t2≤t0If yes, executing step 4; otherwise, execution is performed (equation one), i.e., the power converter is continuously in the off state.
Step 4. turn on the power converter, i.e.
P＝PfFormula two
Step 5, continuously detecting the temperature of the working medium water and the room temperature of the house, if t2＞t0Executing the step 6; otherwise, the power converter is continuously in the on state, i.e. continuously executing (formula two).
Step 6, if delta is equal to epsilon, executing (formula one), namely the power converter is continuously in the off state, and returning to the step 2; otherwise, the power converter is maintained in the on state, i.e. the step 4 is returned to, and the execution is continued (formula two).
Therefore, the power converter is in the on-off alternate state all the time in cycles, so that under the condition that the room temperature of a house is ensured to meet the requirements of people to achieve comfort, the power converter is in the off state to save electric energy, and the purpose of effectively saving energy is achieved. The electricity-saving (energy-saving) effect is
Figure BDA0001322800800000061
The results of the tests prove that: in the valley load period of the power grid, compared with the constant temperature control or the regulation only according to the set room temperature, the power-saving effect of the invention reaches 30 to 50 percent.
The constant temperature control is that the temperature of the set working medium water 14 is used as a stable control reference temperature value of the electromagnetic heating system. The temperature is adjusted only according to the set room temperature, namely the set room temperature is used as a stable adjustment reference temperature value of the electromagnetic heating system.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (4)

1. An electromagnetic heating optimization control method is characterized by comprising the following steps:
step one, arranging an electromagnetic heating detection and control hardware system, wherein the hardware system comprises an electromagnetic heater, a power converter, an alternating current power supply, a controller, a working medium temperature detector and a room temperature sensor;
optimizing the control process, namely adopting double closed-loop control of room temperature feedback and working medium temperature feedback, and determining the on or off of the electromagnetic heating power supply according to the deviation of the room temperature and the working medium temperature and the logic judgment of the room temperature deviation state;
the second step is specifically as follows:
step 1, making the real-time temperature of the working medium water be t1Room temperature real-time temperature of t2，t1-t2δ is the temperature difference between the two; t is t0Setting room temperature;
step 2, judging whether delta is smaller than epsilon, if delta is smaller than epsilon, executing step 3; otherwise, the temperature and the room temperature of the working medium are continuously detected, and the power converter is in a closed state, namely
P is 0 formula one
Wherein epsilon is a set threshold; p is the power output of the electromagnetic heating power converter;
step 3. determine t2Whether or not t is less than or equal to0If t is2≤t0If yes, executing step 4; otherwise, executing formula one, namely the power converter is continuously in the off state;
step 4. turn on the power converter, i.e.
P＝PfFormula two
Wherein, PfIs the high frequency power output at frequency f;
step 5, continuously detecting the temperature of the working medium water and the room temperature of the house, if t2＞t0Executing the step 6; otherwise, the power converter is continuously in the on state, namely, the formula II is continuously executed;
step 6, judging whether epsilon is equal to delta or not, if delta is equal to epsilon, executing a formula I, namely the power converter is continuously in a closed state, and returning to the step 2; otherwise, the power converter is maintained in the on state, that is, the step 4 is returned to, and the formula two is continuously executed.
2. An electromagnetic heating optimization control method according to claim 1, characterized in that the specific connection relationship of the hardware system is as follows:
the alternating current power supply converts 50Hz commercial power into high-frequency electromagnetic power through the power converter and outputs the high-frequency electromagnetic power to the electromagnetic heater, and the electromagnetic heater heats working medium water flowing through the electromagnetic heater;
the room temperature sensor is used for sensing the real-time temperature of the space of the heated house and transmitting a room temperature sensing signal to the room temperature sensing signal inlet of the controller;
the working medium temperature detector is used for detecting the real-time temperature of the working medium water flowing through the electromagnetic heater and outputting a working medium water temperature detection signal to the working medium water temperature signal inlet of the controller;
the controller outputs a control instruction signal through the electromagnetic heating optimization control power converter according to the received room temperature sensing signal and the received working medium water temperature signal, controls the on or off of the high-frequency alternating current flowing through the coil of the electromagnetic heater, enables the working medium water flowing through the electromagnetic heater to obtain corresponding heat energy, and correspondingly adjusts the working medium water temperature and the room temperature of the house along with the generation of the corresponding heat energy.
3. The optimal control method for electromagnetic heating and heating as claimed in claim 1, wherein steps 1-6 are repeated, so that the power converter is always in an on-off alternating state, and therefore, under the condition that the room temperature of a house is ensured to meet the requirements of people and achieve comfort, the power converter is in an off state to save electric energy, and the purpose of effective energy conservation is achieved.
4. The optimal control method for electromagnetic heating according to claim 1, wherein the method has the effect of saving electricity
Figure FDA0002194024200000021
Wherein, Tτ＝τ(1)＝τ2-τ1Time period, T, for outputting high frequency power for a mains power converter0Is a room temperature variation period, T0＝τ1-τ0，τ0For the start of the operation of the power converter, tau1For the first turn-on time, τ, after the power converter has been turned off during operation2For the operation of the power converter through the first switching-on time tau1The first closing moment thereafter.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1373331A (en) * 2001-02-28 2002-10-09 北京泰德生态***工程有限公司 Fuzzy control method for gas boiler to provide hot water and heat
CN101709904A (en) * 2009-12-15 2010-05-19 青岛福润德自动化技术有限公司 solar electromagnetic boiler
CN201611141U (en) * 2010-02-10 2010-10-20 山东科技大学 Thermal balance intelligent regulating system of heat supply network
CN101889175A (en) * 2007-12-04 2010-11-17 庆东网络株式会社 Method for controlling heating system
JP4914135B2 (en) * 2006-07-10 2012-04-11 東洋機械金属株式会社 Mold temperature control system for molding machine
CN104141982A (en) * 2014-07-22 2014-11-12 山西潞安环保能源开发股份有限公司常村煤矿 Heat supply network heat balance control method and system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1373331A (en) * 2001-02-28 2002-10-09 北京泰德生态***工程有限公司 Fuzzy control method for gas boiler to provide hot water and heat
JP4914135B2 (en) * 2006-07-10 2012-04-11 東洋機械金属株式会社 Mold temperature control system for molding machine
CN101889175A (en) * 2007-12-04 2010-11-17 庆东网络株式会社 Method for controlling heating system
CN101709904A (en) * 2009-12-15 2010-05-19 青岛福润德自动化技术有限公司 solar electromagnetic boiler
CN201611141U (en) * 2010-02-10 2010-10-20 山东科技大学 Thermal balance intelligent regulating system of heat supply network
CN104141982A (en) * 2014-07-22 2014-11-12 山西潞安环保能源开发股份有限公司常村煤矿 Heat supply network heat balance control method and system

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