CN105870931B - The control method of flexible load self-control system based on mains frequency - Google Patents
The control method of flexible load self-control system based on mains frequency Download PDFInfo
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- CN105870931B CN105870931B CN201610435249.4A CN201610435249A CN105870931B CN 105870931 B CN105870931 B CN 105870931B CN 201610435249 A CN201610435249 A CN 201610435249A CN 105870931 B CN105870931 B CN 105870931B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004378 air conditioning Methods 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 19
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/242—Home appliances
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a kind of flexible load self-control systems based on mains frequency, and including mains frequency acquisition module, dsp controller, control output module, control output module includes：Flexible load controller and wireless signal sending module, flexible load controller are powered or power off control for socket；Wireless signal sending module is used for the adjusting control for possessing the electric load of Radio Control Function.The invention also discloses a kind of control methods of the flexible load self-control system based on mains frequency, adjust the electric power of electric load according to the real-time frequency of supply of power grid or decide whether the power supply of cut-out electric load.The present invention realizes flexibility and becomes more meticulous electric load autonomous control, significantly improves the frequency ability of regulation and control of power grid, ensures for the power grid elastic recovery capability in the case of the catastrophe failures such as extra-high voltage direct-current bipolar locking, suitable for the flexibility autonomous control of household electric appliances.
Description
Technical field
The present invention relates to a kind of flexible load self-control systems based on mains frequency, further relate to a kind of based on power grid frequency
The control method of the flexible load self-control system of rate, belongs to technical field of power systems.
Background technology
After large-scale receiving end power grid is changed by self-centered regional power grid, operation of power networks characteristic changes essence occurs
Become, be faced with the technical issues of many new, particularly across region alternating current-direct current power transmission passage because of equipment, outer broken, disaster, failure locking
Etc. reasons and the risk stopped transport, the unexpected stoppage in transit particularly during high-power conveying will be directly to the safety of large receiving-end grid
Stable operation causes larger impact.How when extra-high voltage alternating current-direct current passway for transmitting electricity is stopped transport effectively and rapidly Load adjustment, most
Significantly reduce the major issue that the power failure on user influences to have become urgently to be resolved hurrily under the new operation general layout of power grid.Therefore,
There is an urgent need to make full use of the load Precise control technology based on user's intelligent interaction, the new of user oriented device end is studied
The autonomous Flexibility Control Technique of type provides strong technology for the Jiangsu Electric Power Grid operation under the big regional internet background of extra-high voltage and protects
Barrier.
In recent years, since electric vehicle, distributed micro-grid system etc. have the novel load with power grid two-way interaction ability
Development so that this new scheduling method of flexible load is concerned.Flexible load can exist according to the output power of power grid
Specify section in or different time sections in adjust automatically itself power consumption load, flexible load is grinding for following dispatching of power netwoks
Study carefully hot spot.And current marketing bears control and belongs to extensive style control, in control range, all loads are all implemented to interrupt, and do not differentiate between
Specific electrical equipment type and responsible consumer.It, can since user has before signed interruptible load contract with marketing
To obtain corresponding economic compensation or price incentive.
Mains frequency has relatively straightforward relation with active power balance, when demand active power is equal to supply wattful power
During rate, mains frequency remains unchanged, and when demand active power is more than supply active power, mains frequency declines, otherwise rises.
For this characteristic, applicants studied a kind of control systems for declining realization flexible load autonomous control by perceiving mains frequency
System and control method, to promote the frequency ability of regulation and control of power grid.
The content of the invention
It is an object of the invention to provide a kind of flexible load self-control systems based on mains frequency, solve existing skill
Cause the technical issues of mains frequency declines, mains frequency ability of regulation and control is poor because power grid supplies active underpower in art.
In order to solve the above technical problems, the technical solution adopted in the present invention is：Flexible load based on mains frequency is certainly
Master control system, including mains frequency acquisition module, dsp controller, control output module and human-computer interaction module；The power grid
The input terminal connection of the output terminal and dsp controller of frequency acquisition module, the input terminal for controlling output module and DSP's is defeated
Outlet connects, and the human-computer interaction module is connected with dsp controller two-way signaling；
The control output module includes：Flexible load controller and wireless signal sending module, the flexible load control
Device processed realizes the energization or power-off that electric electric load is taken by socket by controlling the energization or power-off of socket；It is described wireless
Signal transmitting module realizes the adjusting control for the electric load for possessing Radio Control Function by sending wireless Regulate signal；
Mains frequency acquisition module gathers mains frequency in real time, and dsp controller is compared judgement according to mains frequency, choosing
It selects corresponding load soft control strategy or is exported by human-computer interaction module and alarmed, control output module is exported according to DSP
Control strategy to each electric load carry out electric power control.
The flexible load controller includes solid-state relay, and the solid-state relay is once connected to 220V exchanges
In electricity, 220V alternating currents connect socket by solid-state relay；The linear quadratic control end of solid-state relay is accessed by triode Q2
The I/O port of dsp controller；
When the I/O port of dsp controller is high level, triode Q2 saturation conductions, solid-state relay once holds closure, inserts
Seat is powered；When the I/O port of dsp controller is low level, triode Q2 cut-offs, so as to which solid-state relay once holds disconnection, socket
Power-off.
The wireless signal sending module is the omnipotent IR remote controller of omnidirection, including multiple infrared signal transmitting tubes, respectively
Infrared transmitting tube is connected by respective infrared emission tube drive circuit with dsp controller respectively.
The electric load for possessing Radio Control Function includes：Air-conditioning and television set.
The human-computer interaction module includes：Liquid crystal touch screen and voice module are born when mains frequency drops to needs adjustment
During lotus electric power, voice module output voice broadcast warning, meanwhile, liquid crystal touch screen is levied in a manner of text prompt to user
Seek autonomous control permission；After autonomous control permission opens, when detecting that mains frequency declines again, human-computer interaction module will no longer
Control authority is solicited to user, but autonomous Load adjustment electric power；When mains frequency is more than the mains frequency upper limit of setting
When, dsp controller exports the excessively high warning message of mains frequency by voice module.
The mains frequency acquisition module includes single-phase alternating current frequency acquisition module and three-phase alternating current frequency collection mould
Block；The single-phase simple alternating current electric signal of input is converted to the square-wave signal of same frequency by single-phase alternating current frequency acquisition module, and
Access the square wave capture mouth of dsp controller；Three-phase alternating current frequency acquisition module turns power grid A, B, C three phase sine input signal
It is changed to unipolarity differential signal.
The invention also discloses a kind of control method of the flexible load self-control system based on mains frequency, according to electricity
The real-time frequency of supply of net adjusts the electric power of electric load or decides whether to cut off the power supply of electric load, is specially：
When the real-time frequency of supply of power grid is beyond setting power grid normal working frequency upper limit value, output alarm；
When the real-time frequency of supply of power grid is less than setting power grid normal working frequency lower limiting value and higher than mains frequency lower limit pole
During value, electric load electric power or cut-out electric load power supply are reduced；
When the real-time frequency of supply of power grid is less than mains frequency lower limit extreme value, all power loads in addition to lighting load are cut off
Lotus.
The electric load includes lighting load, air-conditioning and television set, and specific control method is as follows：
Acquisition power network signal in real time calculates mains frequency；
As mains frequency >=50.5Hz, the excessively high warning message of mains frequency is exported；
As 49.8Hz≤mains frequency ＜ 50.0Hz, mains frequency category normal range (NR) does not make any adjustments；
It, will be from homophony if mains frequency was consistently less than 49.8 more than 5 minutes as 49.0Hz≤mains frequency ＜ 49.8Hz
Whole air conditioner load, it is up to 8 DEG C to make air-conditioning design temperature and ambient temperature differences；
As 48.5Hz≤mains frequency ＜ 49.0Hz, continue, from main modulation air conditioner load, to make air-conditioning design temperature and ring
Border temperature difference is up to 5 DEG C；
It is only lighting load power supply as mains frequency ＜ 48.5Hz, remaining of cut-out including air-conditioning, television set is electric
Power load.
The method for calculating mains frequency is as follows：
For single phase ac electric signal, single-phase sine voltage signal is gathered by voltage transformer, it is low-pass filtered successively
Device, zero cross detection circuit are converted to the square-wave signal of same frequency, and square-wave signal accesses the input capture unit of dsp controller, defeated
Enter the capturing unit CAP1 of capturing unit acquisition DSP task managers EVA, and select time references of the timer T1 as CAP1,
Timer T1, which is operated in, is increased continuously count mode；And set the rising edge of capturing unit CAP1 capture square-wave signals；Before capture
Clear interrupt flag bit is wanted, capture is opened and interrupts；Party's ripple signal can obtain by the time interval for capturing down trigger twice
Frequency is the frequency of single phase ac electric signal；
For Three-phase alternating current signal, each phase sine voltage signal is gathered respectively by voltage transformer, each phase is sinusoidal
Voltage signal by low-pass filter, differential conversion circuit, is converted to unipolarity differential analog signal, dsp controller leads to respectively
It crosses analog-to-digital conversion and the unipolarity differential analog signal of three-phase voltage is converted into digital signal, calculate obtain three by the following method
The real-time frequency of supply of intersecting galvanic electricity：
If the expression formula of three-phase alternating current real-time voltage is respectively：
uA(t)=Um cos(wt)
If
Then three-phase voltage amplitudeWherein：W is electrical network angular frequency；
Then take kth time and the calculating mains frequency of the sampled value of k-1 times as follows：
Wherein, TSFor the sampling period of dsp controller, k is >=2 positive integer.
Compared with prior art, the invention has the advantages that：Real-time perception mains frequency, according to mains frequency
Grading control is carried out to electric load, realizes that flexibility becomes more meticulous electric load autonomous control；Using voice module and LCD touch
Screen carries out human-computer interaction, in the case where Guarantee control system and user carry out normal information interaction, improves user experience；It can
It effectively solves to supply the technical issues of active underpower causes mains frequency to decline because of power grid, significantly improves the frequency tune of power grid
Control ability is ensured for the power grid elastic recovery capability in the case of the catastrophe failures such as extra-high voltage direct-current bipolar locking.The present invention is suitable
For the flexibility autonomous control of common household electric appliance.
Description of the drawings
Fig. 1 is the structure diagram of the flexible load self-control system provided by the invention based on mains frequency.
Fig. 2 is the circuit diagram of single-phase alternating current frequency acquisition module in Fig. 1.
Fig. 3 is that A intersects the circuit diagram of galvanic electricity frequency collection in three-phase alternating current frequency acquisition module in Fig. 1.
Fig. 4 is the circuit diagram that output module is controlled in Fig. 1.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and be not intended to limit the protection scope of the present invention and limit the scope of the invention.
As shown in Figure 1, be the structure diagram of the flexible load self-control system provided by the invention based on mains frequency,
Including：Mains frequency acquisition module, dsp controller, control output module and human-computer interaction module.Mains frequency acquisition module
The input terminal of output terminal and dsp controller connects, and the input terminal of output module and the output terminal of DSP is controlled to connect, human-computer interaction
Module is connected with dsp controller two-way signaling.
Mains frequency acquisition module is connected to network system by voltage transformer, and voltage transformer signal is adjusted
Reason perceives mains frequency for dsp controller.Mains frequency acquisition module includes single-phase alternating current frequency acquisition module and three-phase
Ac frequency acquisition module.The square wave that the single-phase sine of input is converted to same frequency by single-phase alternating current frequency acquisition module is believed
Number, and access the square wave capture mouth of dsp controller.Three-phase alternating current frequency acquisition module exchanges power grid A, B, C three phase sine
Electrical input signal is converted to unipolarity differential signal.
As shown in Fig. 2, be the circuit diagram of single-phase alternating current frequency acquisition module, the first voltage including sequential series
Mutual inductor, the first low-pass filter and zero cross detection circuit.First voltage mutual inductor uses precision 2mA/2mA voltage transformers,
220V single-phase alternating currents are connected to the primary side of first voltage mutual inductor by 160 kilo-ohms of resistance R7, first voltage mutual inductor
220V single phase ac electric signals are switched to the sinusoidal signal that amplitude is 3V by secondary side by 1.5 kilo-ohms of resistance R13.First low pass
Wave filter is the active low-pass filter built using AD648 amplifiers, resistance R8, resistance R1, capacitance C1, the first low-pass filter
- 3dB cutoff frequencies be 63.7Hz.The sinusoidal signal that amplitude is 3V is switched to the square-wave signal of same frequency by zero cross detection circuit,
The sinusoidal signal of 3V carries out halfwave rectifier by diode D1 first, and former sinusoidal signal is only left positive half cycle part at this time, becomes
Half-wave sinusoidal, the half-wave sinusoidal and then is compared by voltage comparator LM339 and 1.1V reference voltage.
1.1V reference voltages are divided by resistance R15, R16 and obtained.The function of voltage comparator LM339 is：When the electricity of half-wave sinusoidal
When pressure is higher than 1.1V, voltage comparator LM339 output low levels；When the voltage of half-wave sinusoidal is less than 1.1V, voltage ratio
High level is exported compared with device LM339.In this way, 220V single-phase alternating currents are converted to the square-wave signal of same frequency, which connects
Enter the input capture unit of dsp controller.Input capture unit uses the capturing unit CAPl of DSP task managers EVA, and
Time references of the timer T1 as CAPl is selected, T1, which is operated in, is increased continuously count mode.And set capturing unit CAP1 captures
The rising edge of square-wave signal.Clear interrupt flag bit is wanted before capture, capture is opened and interrupts.By between time for capturing down trigger twice
Every the frequency for the frequency, i.e. 220V single-phase alternating currents that can obtain party's ripple signal.
Three-phase alternating current frequency acquisition module includes three groups of second voltage mutual inductors, three group of second low-pass filter and three groups
Differential conversion circuit, three groups of second voltage mutual inductors are respectively used to the ac signal of measurement A phase, B phase, C phase, and three group second low
Bandpass filter circuit carries out low-pass filtering to Three-phase alternating current signal respectively, is finally coupled to differential conversion circuit.Intersected below with A
Exemplified by galvanic electricity, three-phase alternating current frequency acquisition module is described in further detail.
Second voltage mutual inductor is identical with the circuit structure of foregoing first voltage mutual inductor, the second low-pass filter
It is identical with the circuit structure of the first foregoing low-pass filter.It is low by second voltage mutual inductor and second that A intersects galvanic electricity
Switch to the sinusoidal ac signal that amplitude is 3V after bandpass filter, which is ambipolar, i.e., signal voltage has just
Have negative.Since the AD conversion module of dsp controller cannot access negative voltage, therefore turn by the sinusoidal ac signal and then by difference
Circuit conversion is changed as unipolarity difference sinusoidal signal.The principle mechanisms of unipolarity difference sinusoidal signal are as follows：S+ and S- delivery outlets
Voltage be all positive voltage respectively, but the difference of S+ and S- is sinusoidal signal.Differential signal can effectively reduce common mode and make an uproar
Sound improves Signal-to-Noise.
Differential conversion circuit includes operational amplifier U3, after the electrode input end series resistance R9 of operational amplifier U3 with
The output terminal of second low-pass filter circuit is electrically connected, and is grounded after negative input series resistance R14.The anode of operational amplifier U3
AD conversion interface after output terminal series resistance R12, after cathode output end series resistance R10 respectively with dsp controller is connected.Fortune
It calculates and capacitance C3 is also in series between the electrode input end and cathode output end of amplifier U3, after electrode input end also series resistance R3
It is electrically connected with the electric contact of resistance R10 and dsp controller.Between the negative input and cathode output end of operational amplifier U3 also
Capacitance C4 is in series with, is electrically connected after negative input also series resistance R17 with the electric contact of resistance R12 and dsp controller.Computing
That amplifier U3 is selected is OPA1632, since the AD conversion module ceiling voltage of dsp controller is 3V, OPA1632's
Common-mode voltage input port to 1.5V reference voltage, so as to ensure difference amplifier output end voltage centered on 1.5V common-mode voltages
Symmetrically.The sinusoidal signal input amplitude of differential conversion circuit is ± 3V, and voltage surge signal burns out AD acquisition modules in order to prevent,
The differential conversion gain of present invention configuration differential conversion circuit is 2/3, i.e. the ratio of resistance R3 and resistance R9.So amplitude is 3V
Sinusoidal signal by differential conversion circuit become amplitude be 2V difference sinusoidal signal, so as to ensure the signal after differential conversion
It can be completely in the range ability of the AD conversion module of dsp controller.The difference sinusoidal signal that amplitude is 2V is connected to DSP controls
The ADC1 mouths of device processed and ADC2 mouthfuls, the AD values that the AD values of ADC2 passages are subtracted ADC2 passages by dsp controller obtain amplitude and are
2V, and intersect the sinusoidal signal that galvanic electricity inputs same frequency with A.
Similarly, B intersects galvanic electricity input and is connected to ADC3 mouths of dsp controller and ADC4 mouthfuls；C intersects galvanic electricity input and is connected to
The ADC5 mouths of dsp controller and ADC6 mouthfuls.B phases and the circuit theory of C phase passages are identical with A phases.
Control output module includes：Flexible load controller and wireless signal sending module.Flexible load controller passes through
The energization or power-off of socket are controlled, realizes the energization or power-off of the electric load that electricity is taken by socket, the electricity of electricity is taken by socket
Power load refers mainly to lighting load.The omnipotent IR remote controller of the preferred omnidirection of wireless signal sending module, it is wireless red by sending
External signal realizes the adjusting control for the electric load for possessing Radio Control Function, the power load for possessing Radio Control Function herein
Pocket includes air-conditioning, television set.
As shown in figure 4, the circuit diagram of output module in order to control.Flexible load controller includes solid-state relay K1,
The I/O port GPIOA1 of dsp controller carries out power amplification by 8050 triode Q2, and then controls ac solid relay K1's
Linear quadratic control end, solid-state relay are once terminated in 220V alternating currents, and 220V alternating currents are connected to by solid-state relay K1
In socket, room lighting load takes electricity by socket.When GPIOA1 is high level, triode Q2 saturation conductions, so as to solid-state
Relay once holds closure, and socket has electricity, and lighting load is lighted.When GPIOA1 is low level, triode Q2 cut-offs, so as to solid
State relay once holds disconnection, socket power-off, and lighting load extinguishes.
The core devices of the omnipotent IR remote controller of omnidirection are infrared signal transmitting tube DS1, and infrared signal transmitting tube DS1 can
To send wavelength as 940 nanometers of infrared light.Since the I/O port GPIOA0 driving forces of dsp controller are limited, therefore use herein
8050 triode Q1 composition power amplification circuit driving infrared signal transmitting tubes DS1.The supply voltage of 12V is after R18 current limlitings
Effect control infrared signal transmitting tube DS1 is cut-off by triode Q1.Infrared remote-controlled signal uses 38.5KHZ square-wave signals pair
Infrared light is modulated.Domestic air conditioning, the Remoting Protocol of TV of different brands are integrated in DSP controllers, so as to control
Different brands processed, the domestic air conditioning or TV of different model.In order to ensure the omni-directional transmissions of the infrared remote-controlled signal, the present invention
There is provided 8 identical infrared signal transmitting tube DS1, so that signal being capable of theaomni-directional transmission.
Human-computer interaction module includes：Liquid crystal touch screen and voice module need Load adjustment to use when mains frequency drops to
During electrical power, voice module output voice broadcast warning, meanwhile, liquid crystal touch screen is solicited certainly in a manner of text prompt to user
Main control permission；Autonomous control permission open after, detect again mains frequency decline when, human-computer interaction module will no longer to
Control authority is solicited at family, but autonomous Load adjustment electric power；When mains frequency is more than the mains frequency upper limit of setting,
Dsp controller exports the excessively high warning message of mains frequency by voice module.
The invention also discloses a kind of control method of the flexible load self-control system based on mains frequency, according to electricity
The real-time frequency of supply of net adjusts the electric power of electric load or decides whether to cut off the power supply of electric load：When power grid is real
When frequency of supply beyond setting power grid normal working frequency upper limit value when, output alarm；It is set when the real-time frequency of supply of power grid is less than
When determining power grid normal working frequency lower limiting value and being higher than mains frequency lower limit extreme value, electric load electric power or cut-out are reduced
Electric load power supply；When the real-time frequency of supply of power grid is less than mains frequency lower limit extreme value, cut off all in addition to lighting load
Electric load.
For the flexible control of household electric appliances, electric load includes lighting load, air-conditioning and television set, and air-conditioning is as family
The high-power electric load of electrical appliance, is the key that flexible autonomous adjusting control, and specific control method is as follows：
Step 1：Acquisition power network signal in real time, calculates mains frequency, and specific method is as follows：
For single phase ac electric signal, single-phase sine voltage signal is gathered by voltage transformer, it is low-pass filtered successively
Device, zero cross detection circuit are converted to the square-wave signal of same frequency, and square-wave signal accesses the input capture unit of dsp controller, defeated
Enter the capturing unit CAP1 of capturing unit acquisition DSP task managers EVA, and select time references of the timer T1 as CAP1,
Timer T1, which is operated in, is increased continuously count mode；And set the rising edge of capturing unit CAP1 capture square-wave signals；Before capture
Clear interrupt flag bit is wanted, capture is opened and interrupts；Party's ripple signal can obtain by the time interval for capturing down trigger twice
Frequency is the frequency of single phase ac electric signal；
For Three-phase alternating current signal, each phase sine voltage signal is gathered respectively by voltage transformer, each phase is sinusoidal
Voltage signal by low-pass filter, differential conversion circuit, is converted to unipolarity differential analog signal, dsp controller leads to respectively
It crosses analog-to-digital conversion and the unipolarity differential analog signal of three-phase voltage is converted into digital signal, calculate obtain three by the following method
The real-time frequency of supply of intersecting galvanic electricity：
If the expression formula of three-phase alternating current real-time voltage is respectively：
uA(t)=Um cos(wt)
If
Then three-phase voltage amplitudeWherein：W is electrical network angular frequency；
Then take kth time and the calculating mains frequency of the sampled value of k-1 times as follows：
Wherein, TSFor the sampling period of dsp controller, k is >=2 positive integer.
Step 2：Multilevel iudge, control strategy output：
As mains frequency >=50.5Hz, dsp controller exports the excessively high alarm signal of mains frequency by control voice module
Breath；
As 49.8Hz≤mains frequency ＜ 50.0Hz, mains frequency category normal range (NR) does not make any adjustments；
As 49.0Hz≤mains frequency ＜ 49.8Hz, power grid accident frequency is had been enter into, operation of power networks total duration is not
Must be more than 30 minutes, therefore autonomous flexible load monitoring control devices continue after five minutes less than 49.8Hz, will be born from main modulation air-conditioning
Lotus is adjusted air-conditioning design temperature by the omnipotent IR remote controller of omnidirection, ensures air-conditioning design temperature with ambient temperature differences most
A height of 8 DEG C；
As 48.5Hz≤mains frequency ＜ 49.0Hz, from main modulation air conditioner load, pass through the omnipotent infrared remote control of omnidirection
Device adjusts air-conditioning design temperature, ensures that air-conditioning design temperature and ambient temperature differences are up to 5 DEG C；
It is only lighting load power supply as mains frequency ＜ 48.5Hz, remaining of cut-out including air-conditioning, television set is electric
Power load.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (1)
1. the control method of the flexible load self-control system based on mains frequency, which is characterized in that according to the real-time of power grid
Frequency of supply adjusts the electric power of electric load or decides whether to cut off the power supply of electric load, is specially：
When the real-time frequency of supply of power grid is beyond setting power grid normal working frequency upper limit value, output alarm；
When the real-time frequency of supply of power grid is less than setting power grid normal working frequency lower limiting value and is higher than mains frequency lower limit extreme value,
Reduce electric load electric power or cut-out electric load power supply；
When the real-time frequency of supply of power grid is less than mains frequency lower limit extreme value, all electric loads in addition to lighting load are cut off；
The electric load includes lighting load, air-conditioning and television set, and specific control method is as follows：
Acquisition power network signal in real time calculates mains frequency；
As mains frequency >=50.5Hz, the excessively high warning message of mains frequency is exported；
As 49.8Hz≤mains frequency ＜ 50.0Hz, mains frequency category normal range (NR) does not make any adjustments；
It, will be empty from main modulation if mains frequency was consistently less than 49.8 more than 5 minutes as 49.0Hz≤mains frequency ＜ 49.8Hz
Load is adjusted, it is up to 8 DEG C to make air-conditioning design temperature and ambient temperature differences；
As 48.5Hz≤mains frequency ＜ 49.0Hz, continue, from main modulation air conditioner load, to make air-conditioning design temperature and environment temperature
Up to 5 DEG C of degree difference；
As mains frequency ＜ 48.5Hz, it is only lighting load power supply, cuts off remaining power load including air-conditioning, television set
Lotus；
The method for calculating mains frequency is as follows：
For single phase ac electric signal, single-phase sine voltage signal is gathered by voltage transformer, successively low-pass filtered device, mistake
Zero detection circuit is converted to the square-wave signal of same frequency, and square-wave signal accesses the input capture unit of dsp controller, and input is caught
The capturing unit CAP1 of unit acquisition DSP task managers EVA is obtained, and selects time references of the timer T1 as CAP1, timing
Device T1, which is operated in, is increased continuously count mode；And set the rising edge of capturing unit CAP1 capture square-wave signals；It is clear before capture
Interrupt flag bit is opened capture and is interrupted；It can obtain the frequency of party's ripple signal by the time interval for capturing down trigger twice,
The as frequency of single phase ac electric signal；
For Three-phase alternating current signal, each phase sine voltage signal is gathered respectively by voltage transformer, by each phase sinusoidal voltage
Signal by low-pass filter, differential conversion circuit, is converted to unipolarity differential analog signal, dsp controller passes through mould respectively
The unipolarity differential analog signal of three-phase voltage is converted to digital signal by number conversion, and it is intersecting to calculate acquisition three by the following method
The real-time frequency of supply of galvanic electricity：
If the expression formula of three-phase alternating current real-time voltage is respectively：
uA(t)=Umcos(wt)
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If
Then three-phase voltage amplitudeWherein：W is electrical network angular frequency；
Then take kth time and the calculating mains frequency of the sampled value of k-1 times as follows：
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Wherein, TSFor the sampling period of dsp controller, k is >=2 positive integer.
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| CN107104331B (en) * | 2017-06-06 | 2019-07-09 | 山东大学 | Intelligent socket and its working method with cutting load function |
| CN109028457B (en) * | 2018-06-29 | 2020-08-04 | 国网山东省电力公司电力科学研究院 | Control method for central air conditioner load response HVDC blocking accident |
| CN108667316A (en) * | 2018-06-29 | 2018-10-16 | 苏州格远电气有限公司 | Ac-input type Switching Power Supply |
| CN110333400A (en) * | 2019-08-19 | 2019-10-15 | 陕西万方节能科技股份有限公司 | A kind of three-phase power supply phase sequence and phase interruption testing device and method |
| CN111585526B (en) * | 2020-05-21 | 2023-09-08 | 上海艾为集成电路技术有限公司 | Audio modulation circuit and electronic device |
| CN112366729A (en) * | 2020-11-02 | 2021-02-12 | 北京用尚科技股份有限公司 | System and method for adaptively adjusting power load according to power grid frequency deviation |
| CN112559177B (en) * | 2020-12-15 | 2024-01-26 | 杭州和利时自动化有限公司 | Industrial control system and load management method and equipment thereof |
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