CN107302156A - A kind of 220V smart jacks and its method of work with low frequency load shedding function - Google Patents
A kind of 220V smart jacks and its method of work with low frequency load shedding function Download PDFInfo
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- CN107302156A CN107302156A CN201710417018.5A CN201710417018A CN107302156A CN 107302156 A CN107302156 A CN 107302156A CN 201710417018 A CN201710417018 A CN 201710417018A CN 107302156 A CN107302156 A CN 107302156A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/6608—Structural association with built-in electrical component with built-in single component
- H01R13/6633—Structural association with built-in electrical component with built-in single component with inductive component, e.g. transformer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/665—Structural association with built-in electrical component with built-in electronic circuit
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Emergency Protection Circuit Devices (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a kind of 220V smart jacks with low frequency load shedding function and its method of work, wherein, the socket includes power network single-phase electricity input interface, and it is used to sample the grid ac voltage signal based on clock sync signal and is sent to digital signal processor through voltage transformer and A/D modular converters successively；The digital signal processor is connected with relay, and the relay is connected with jack sheet metal；The digital signal processor is configured as：The electric signal of A/D modular converters sampling is read, and calculates the real-time frequency value of power network；Real-time frequency value is compared with setpoint frequency value, and then the power supply for relay sending open and close controlling signal to disconnect or recover socket power, with realize whether cutting load.The present invention concentrates on UFLS function in 220V sockets, saves space and reduces cost, suitable for being installed extensively in 220V sides, is engaged with high-pressure side automatic low frequency load shed- ding device, is significant to improving power system frequency stability.
Description
Technical field
The invention belongs to power system low frequency load shedding technical field, more particularly to it is a kind of with low frequency load shedding function
220V smart jacks and its method of work.
Background technology
Under the promotion of energy revolution, a large amount of accesses that the intermittent renewable such as wind-power electricity generation, photovoltaic generation energy generates electricity
Cause very big influence on operation of power networks characteristic, distribution net side Electrical Power System Dynamic behavior more sophisticated, frequency stability is more
It is difficult to control to.
UFLS：When system is by large disturbances, confession, the unbalanced situation of electricity consumption active power often occurs, is
Prevent the power system frequency of occurrences from collapsing, cause frequency when power system vacancy occurs because generating electricity between the demand of power load
When rate declines, according to the operating frequency value adjusted in advance, fixed a part of secondary load in system is cut off successively,
So that system active power tends to balance again, frequency is gone up.In China, UFLS action is generally divided into 5~6
Wheel, the starting frequency of the first round is adjusted in 48.5~49.1Hz, and last wheel is 47.0~47.5Hz.
Existing automatic low frequency load shed- ding device is as the stable last line of defense automatically controlled of power system security, when being
When occurring active power shortage in system and causing the frequency to decline, the degree declined according to frequency disconnects a part of unessential automatically
User, prevents frequency from declining, so that frequency is promptly restored to normal value, it is ensured that the reliability that responsible consumer is powered.Automatic low-frequency
Although load-shedding equipment can meet the control requirement of frequency stability, device is generally mounted to power plant and transformer station, is used to
A plurality of branch road is monitored, once going wrong, coverage is very big, simultaneously as the reason such as complicated structure and cost, not
Installed in 220V low-pressure sides.
The break-make of low-pressure side 220V sockets is by the air switch control installed in user side, when generation heavy overload or short circuit
During failure, air switch main contacts disconnects, and then disconnects each bar branch road socket being connected with air switch, realizes control and protects
Protective function.Therefore, existing 220V sockets can not reach the purpose of low frequency load shedding by auto switching.
In summary, a kind of 220V smart jacks with low frequency load shedding function are needed badly, are reached by auto switching
The purpose of low frequency load shedding ensures the reliability of customer power supply.
The content of the invention
In order to solve the deficiencies in the prior art, intelligently inserted the invention provides a kind of 220V with low frequency load shedding function
Seat, the socket can cut away load automatically when mains frequency declines serious, reach the purpose of protection electrical equipment.
A kind of 220V smart jacks with low frequency load shedding function of the present invention, including：
Power network single-phase electricity input interface, it is used for the grid ac voltage signal based on clock sync signal and successively of sampling
Digital signal processor is sent to through voltage transformer and A/D modular converters；The digital signal processor is connected with relay,
The relay is connected with jack sheet metal；
The digital signal processor is configured as：
The electric signal of A/D modular converters sampling is read, and calculates the real-time frequency value of power network；
Real-time frequency value is compared with setpoint frequency value, and then sends open and close controlling signal to disconnect or recover to relay
The power supply of socket power, with realize whether cutting load.
Further, the digital signal processor is additionally configured to：
When real-time frequency value is equal to or less than setpoint frequency value, sends disconnection control signal to relay and disconnect socket
Power supply, completes cutting load；
When real-time frequency value is gone up to more than setpoint frequency value, after preset time is delayed, sent out to relay is sent
Go out and close control signal, recover the power supply of socket power.
The smart jack of the present invention can monitor the frequency of power system in real time in low-pressure side, decline in frequency more serious
When, disconnect socket and power, cut off load, largely protect electrical equipment.
Further, the digital signal processor is additionally configured to：
After the power supply of socket power is recovered, if real-time frequency value is higher than setpoint frequency value, relay is failure to actuate.
Further, the digital signal processor is additionally configured to：
The voltage phasor of current electrical signal is calculated using recursive discrete Fourier transform algorithm, according to phase and mains frequency
Relation, calculated rate deviation, and being added with standard frequency value obtains a frequency estimation；
Based on a frequency estimation, self-adapting reconstruction is carried out to the electric signal of the A/D modular converters sampling of reading；
Electric signal progress recursive discrete Fourier transform calculating to the A/D modular converter last samples of reading obtains new
Frequency departure, and be added with a frequency estimation, secondary frequency estimation is obtained, that is, obtains final power network real-time frequency.
The present invention is obtained using the voltage phasor based on recursive discrete Fourier transform algorithm calculating current electrical signal
Frequency estimation；Again based on a frequency estimation, the electric signal of the A/D modular converters sampling of reading is carried out adaptively
Reconstruction calculations go out mains frequency, greatly improve the accuracy of frequency calculating, reduce error action of device and make probability.
Further, the relay is double-pole single-throw (D.P.S.T.) relay；The double-pole single-throw (D.P.S.T.) relay is the switch of socket, is used
To control the break-make of live wire and zero line.
Present invention also offers the method for work of the 220V smart jacks with low frequency load shedding function.
The method of work of the 220V smart jacks with low frequency load shedding function of the present invention, including：
Power network single-phase electricity input interface is sampled the grid ac voltage signal based on clock sync signal and successively through voltage
Transformer and A/D modular converters are sent to digital signal processor；
Digital signal processor reads the electric signal of A/D modular converters sampling, and calculates the real-time frequency value of power network；Will be real
When frequency values compared with setpoint frequency value, and then the confession for relay sending open and close controlling signal to disconnect or recover socket power
Electricity, with realize whether cutting load.
Further, during real-time frequency value is compared with setpoint frequency value, when real-time frequency value is equal to or low
When setpoint frequency value, send disconnection control signal to relay and disconnect socket power, complete cutting load；
When real-time frequency value is gone up to more than setpoint frequency value, after preset time is delayed, sent out to relay is sent
Go out and close control signal, recover the power supply of socket power.
Further, after the power supply of socket power is recovered, if real-time frequency value is higher than setpoint frequency value, relay is not
Action.
Further, digital signal processor reads the electric signal of A/D modular converters sampling, and calculates the real-time frequency of power network
The detailed process of rate value is：
Calculate the voltage phasor of current electrical signal, according to phase and the relation of mains frequency, calculated rate deviation, and with mark
Quasi- frequency values are added, and obtain a frequency estimation；
Based on a frequency estimation, self-adapting reconstruction is carried out to the electric signal of the A/D modular converters sampling of reading；
Electric signal progress recursive discrete Fourier transform calculating to the A/D modular converter last samples of reading obtains new
Frequency departure, and be added with a frequency estimation, secondary frequency estimation is obtained, that is, obtains final power network real-time frequency.
Further, the voltage phasor of current electrical signal is calculated using recursive discrete Fourier transform algorithm.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) smart jack of the present invention can monitor the frequency of power system in real time in low-pressure side, and add in socket after
Electrical equipment, when mains frequency is less than setting value, frequency monitoring module sends signalizing activity in relay contact, powers off socket,
Realize low frequency load shedding.And recovery socket power is powered on frequency recovery to setting value and after certain time-delay, very greatly
Electrical equipment is protected in degree.
(2) present invention uses the voltage phasor that current electrical signal is calculated based on recursive discrete Fourier transform algorithm, and then
Obtain a frequency estimation；Again based on a frequency estimation, the electric signal of the A/D modular converters sampling of reading is carried out certainly
Adapt to reconstruction calculations and go out mains frequency, greatly improve the accuracy of frequency calculating, reduce error action of device and make probability.
(3) it is of the invention by UFLS function collection relative to the special low frequency load shedding equipment by complex hardware structure composition
In in 220V sockets, saving space and reducing cost, suitable for being installed extensively in 220V sides, subtract with high-pressure side automatic low-frequency
Carry to put and be engaged, guarantee is provided to improve power system frequency stability.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not constitute the improper restriction to the application.
Fig. 1 is the hardware structure diagram of smart jack of the present invention；
Fig. 2 is digital signal processor main program flow chart；
Fig. 3 is frequency calculation flow chart；
Fig. 4 is reconstruct flow chart；
Fig. 5 is timer interruption process chart.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Fig. 1 is the hardware structure diagram of smart jack of the present invention.
As shown in figure 1, a kind of 220V smart jacks with low frequency load shedding function of the present invention, including：
Power network single-phase electricity input interface, it is used for the grid ac voltage signal based on clock sync signal and successively of sampling
Digital signal processor is sent to through voltage transformer and A/D modular converters；The digital signal processor is connected with relay,
The relay is connected with jack sheet metal；
The digital signal processor is configured as：
The electric signal of A/D modular converters sampling is read, and calculates the real-time frequency value of power network；
Real-time frequency value is compared with setpoint frequency value, and then sends open and close controlling signal to disconnect or recover to relay
The power supply of socket power, with realize whether cutting load.
The present invention the 220V smart jacks with low frequency load shedding function, in addition to power module, driving chip and show
Display screen.
Wherein, power module dc source for needed for being provided each chip.For example：Power module provides 5V direct currents for each chip
Power supply.
Power network single-phase electricity input interface is used as the input interface of sampled signal both as the input of power module.Electricity
Net single-phase electricity input interface is used to access single phase ac electric signal, and specified input signal is 220V.
In the present embodiment, A/D modular converters are realized using AD conversion chip.
The alternating voltage of access is transformed into the alternating voltage for being adapted to access AD conversion chip by voltage transformer.
The voltage signal that voltage transformer is exported is converted into data signal and is stored in data signal by AD conversion chip
In chip, the sampling to voltage is completed, digital signal processor reads the data signal of AD conversion chip storage in a parallel fashion.
The present invention, from model AD7606 A/D chip, is the true bipolarity modulus conversion chip of 16,8 passage, built-in analog input pincers
Position protection, second order frequency overlapped-resistable filter, can carry out good filtering to input exchange signal.
Wherein, display screen is selected exemplified by LCDs：LCDs can show mains frequency and time etc. in real time
Information.LCD MODULE selects 12864 LCDs, to real-time display frequency multidate information.
Digital signal processor mainly completes the calculating of frequency, the sending of relay action signal, the control of LCDs
System, in addition, digital signal processor will also handle second interrupt signal, the Sampling interrupt signal of A/D chip that GPS is sent, and be
The acp chip of whole smart jack.The present invention is had from TI company model TMS320F28335 32 floating type DSP
The advantages of cost is low, small power consumption, performance high, peripheral hardware integrated level is high, can meet the demand of the present invention.
Driving chip is used for the signal that exports digital signal processor and is amplified that there is provided double-pole single-throw (D.P.S.T.) relay coil
Required high current, and then drive relay contact action, present invention selection Darlington transistor group driving chip.
Relay is double-pole single-throw (D.P.S.T.) relay；The double-pole single-throw (D.P.S.T.) relay is the switch of socket, to control live wire with
The break-make of zero line.Double-pole single-throw (D.P.S.T.) relay is as the critical elements of switching value output circuit, and it is intelligent that the present invention uses it for control
The break-make of live wire and zero line in socket, specifically chosen contact types are normally closed.
Wherein, digital signal processor main program flow chart as shown in Fig. 2 including：Each module initialization, wait clock are same
Step signal, control A/D chip, which complete analog-to-digital conversion, reads AD data line frequency of going forward side by side calculates, by calculated value and setting value 49.5Hz
Relatively and decide whether cutting load.
Frequency calculation flow chart is as shown in Figure 3.If frequency update times are that cal_num and cal_num initial values are 0, if
Current frequency estimate is foldAnd foldInitial value is 50Hz, and every cycle number of samples under the frequency is N, specific frequency meter
Calculate step as follows：
(1) sample sequence is set as V [M+N], and M+N is sample sequence length, and M, N are positive integer.
(2) phase sequence θ [M] is calculated by V [M+N] with recursion discrete fourier phasor analysis, phase sequence is long
Spend for M.
(3) following equation is used
Δ θ (n)=θ (n)-θ (0), n=0,1 ..., M-1
Calculating obtains phase difference sequence Δ θ [M], and phase difference sequence length is M；
(4) it is permanent quadratic equation Δ θ (k)=a to set phase difference0+a1k+a2k2, a0、a1、a2
For constant coefficient, with following equation
It is abbreviated as Δ θ=Xa
Calculating obtains coefficient matrix a=[XTX]-1XTΔ θ, its
(5) frequency departure is calculatedWherein k=M；
(6) newest frequency estimation is fnew=fold+Δf；
(7)fold=fnew；
(8) frequency update times add 1, i.e. cal_num=cal_num+1.If cal_num is equal to 2, terminate frequency meter
Calculate, result of calculation is newest frequency estimation fnewIf cal_num is less than 2, into step (9).
(9) with newest frequency estimation fnewBased on, the self-adapting reconstruction of waveform is carried out to sample sequence, obtains newest
Frequency estimation fnewCorresponding sample sequence is V [M+N].
(10) return to step (2) continues to calculate.
The flow chart for the sample sequence self-adapting reconstruction method used in said frequencies calculation procedure is as shown in figure 4, specific
Method is as follows：
(1) it is new frequency f to set αnewThe phase intervals of lower two sampled points, i.e.,fnewIt is that newest frequency is estimated
Evaluation, foldIt is previous frequency estimation.
(2) variable is calculated
(3) current sample sequence is set as Vold, the new sample sequence to be calculated is Vnew；
(4) i=0 is set, phase intervals coefficient is calculated
ResampleIndex values is no more thanMaximum integer；
(5) z is set1=Vold(resampleIndex), z2=Vold(resampleIndex+1), i.e. z1And z2Adopt respectively
Sample sequence VoldResampleIndex and resampleIndex+1 element；
(6) V is calculatednewI-th of element,
(7) i=i+1 is made, if i is equal to M+N, calculating terminates, and has obtained new sample sequence Vnew[M+N].If i
Less than M+N, return to step (4)；
As shown in figure 5, to timer interruption process chart, including：Initialize each interrupt register and timer, setting
Timing is 30 seconds, starts timer, responds timer interruption.
Smart jack of the present invention can monitor the frequency of power system in real time in low-pressure side, and add in socket relay
Device, when mains frequency is less than setting value, frequency monitoring module sends signalizing activity in relay contact, powers off socket, real
Existing low frequency load shedding.And recovery socket power is powered on frequency recovery to setting value and after certain time-delay, very great Cheng
Electrical equipment is protected on degree.
The present invention is obtained using the voltage phasor based on recursive discrete Fourier transform algorithm calculating current electrical signal
Frequency estimation；Again based on a frequency estimation, the electric signal of the A/D modular converters sampling of reading is carried out adaptively
Reconstruction calculations go out mains frequency, greatly improve the accuracy of frequency calculating, reduce error action of device and make probability.
Relative to the special low frequency load shedding equipment by complex hardware structure composition, the present invention concentrates on UFLS function
In 220V sockets, save space and reduce cost, suitable for being installed extensively in 220V sides, filled with high-pressure side automatic low-frequency off-load
Put and be engaged, guarantee is provided to improve power system frequency stability.
Present invention also offers the method for work of the 220V smart jacks with low frequency load shedding function.
The method of work of the 220V smart jacks with low frequency load shedding function of the present invention, including：
Step 1：Power network single-phase electricity input interface is sampled the grid ac voltage signal based on clock sync signal and successively
Digital signal processor is sent to through voltage transformer and A/D modular converters；
Step 2：Digital signal processor reads the electric signal of A/D modular converters sampling, and calculates the real-time frequency of power network
Value；Real-time frequency value is compared with setpoint frequency value, and then sends open and close controlling signal to disconnect or recover socket to relay
The power supply of power supply, with realize whether cutting load.
Wherein, in step 2, digital signal processor reads the electric signal of A/D modular converters sampling, and calculates power network
The detailed process of real-time frequency value is：
Step 2.1：The voltage phasor of current electrical signal is calculated, according to phase and the relation of mains frequency, calculated rate is inclined
Difference, and be added with standard frequency value, obtain a frequency estimation；
Specifically, the voltage phasor of current electrical signal is calculated using recursive discrete Fourier transform algorithm.
Step 2.2：Based on a frequency estimation, the electric signal of the A/D modular converters sampling of reading is carried out adaptively
Reconstruct.
Specifically, it is to the specific method of the electric signal progress self-adapting reconstruction of the A/D modular converters sampling to reading：
It is new frequency f that (2-2-1), which sets α,newThe phase intervals of lower two sampled points, i.e.,fnewIt is newest frequency
Rate estimate, foldIt is previous frequency estimation.
(2-2-2) calculates variable
(2-2-3) sets current sample sequence as Vold, the new sample sequence to be calculated is Vnew；
(2-2-4) sets i=0, calculates phase intervals coefficient
ResampleIndex values is no more thanMaximum integer；
(2-2-5) sets z1=Vold(resampleIndex), z2=Vold(resampleIndex+1), i.e. z1And z2Respectively
It is sample sequence VoldResampleIndex and resampleIndex+1 element；
(2-2-6) calculates VnewI-th of element,
(2-2-7) sets M+N as sample sequence length, makes i=i+1, if i is equal to M+N, calculating terminates, and has obtained new
Sample sequence Vnew[M+N].If i is less than M+N.
Step 2.3：Recursive discrete Fourier transform calculating is carried out to the electric signal of the A/D modular converter last samples of reading
New frequency departure is obtained, and is added with a frequency estimation, secondary frequency estimation is obtained, that is, obtains final power network real
When frequency.
In step 2, during real-time frequency value is compared with setpoint frequency value, when real-time frequency value is equal to or low
When setpoint frequency value, send disconnection control signal to relay and disconnect socket power, complete cutting load；
When real-time frequency value is gone up to more than setpoint frequency value, after preset time is delayed, sent out to relay is sent
Go out and close control signal, recover the power supply of socket power.
After the power supply of socket power is recovered, if real-time frequency value is higher than setpoint frequency value, relay is failure to actuate.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (10)
1. a kind of 220V smart jacks with low frequency load shedding function, it is characterised in that including：
Power network single-phase electricity input interface, it is used for grid ac voltage signal of the sampling based on clock sync signal and successively through electricity
Pressure transformer and A/D modular converters are sent to digital signal processor；The digital signal processor is connected with relay, described
Relay is connected with jack sheet metal；
The digital signal processor is configured as：
The electric signal of A/D modular converters sampling is read, and calculates the real-time frequency value of power network；
Real-time frequency value is compared with setpoint frequency value, and then sends open and close controlling signal to disconnect or recover socket to relay
The power supply of power supply, with realize whether cutting load.
2. a kind of 220V smart jacks with low frequency load shedding function as claimed in claim 1, it is characterised in that the number
Word signal processor is additionally configured to：
When real-time frequency value is equal to or less than setpoint frequency value, sends disconnection control signal to relay and disconnect socket electricity
Source, completes cutting load；
When real-time frequency value is gone up to more than setpoint frequency value, after preset time is delayed, closed to sending relay and sending
Control signal is closed, recovers the power supply of socket power.
3. a kind of 220V smart jacks with low frequency load shedding function as claimed in claim 2, it is characterised in that the number
Word signal processor is additionally configured to：
After the power supply of socket power is recovered, if real-time frequency value is higher than setpoint frequency value, relay is failure to actuate.
4. a kind of 220V smart jacks with low frequency load shedding function as claimed in claim 1, it is characterised in that the number
Word signal processor is additionally configured to：
The voltage phasor of current electrical signal is calculated using recursive discrete Fourier transform algorithm, according to phase and the pass of mains frequency
System, calculated rate deviation, and be added with standard frequency value, obtain a frequency estimation；
Based on a frequency estimation, self-adapting reconstruction is carried out to the electric signal of the A/D modular converters sampling of reading；
Electric signal progress recursive discrete Fourier transform calculating to the A/D modular converter last samples of reading obtains new frequency
Deviation, and be added with a frequency estimation, secondary frequency estimation is obtained, that is, obtains final power network real-time frequency.
5. a kind of 220V smart jacks with low frequency load shedding function as claimed in claim 1, it is characterised in that it is described after
Electrical equipment is double-pole single-throw (D.P.S.T.) relay；The double-pole single-throw (D.P.S.T.) relay is the switch of socket, the break-make to control live wire and zero line.
6. a kind of method of work of the 220V smart jacks as claimed in claim 1 with low frequency load shedding function, its feature
It is, including：
Power network single-phase electricity input interface is sampled the grid ac voltage signal based on clock sync signal and successively through mutual induction of voltage
Device and A/D modular converters are sent to digital signal processor；
Digital signal processor reads the electric signal of A/D modular converters sampling, and calculates the real-time frequency value of power network；Will frequently in real time
Rate value is compared with setpoint frequency value, and then the power supply for relay sending open and close controlling signal to disconnect or recover socket power,
With realize whether cutting load.
7. there is the method for work of the 220V smart jacks of low frequency load shedding function as claimed in claim 6, it is characterised in that
During real-time frequency value is compared with setpoint frequency value, when real-time frequency value is equal to or less than setpoint frequency value, to
Relay sends disconnection control signal and disconnects socket power, completes cutting load；
When real-time frequency value is gone up to more than setpoint frequency value, after preset time is delayed, closed to sending relay and sending
Control signal is closed, recovers the power supply of socket power.
8. there is the method for work of the 220V smart jacks of low frequency load shedding function as claimed in claim 7, it is characterised in that
After the power supply of socket power is recovered, if real-time frequency value is higher than setpoint frequency value, relay is failure to actuate.
9. there is the method for work of the 220V smart jacks of low frequency load shedding function as claimed in claim 6, it is characterised in that
Digital signal processor reads the electric signal of A/D modular converters sampling, and calculates the detailed process of the real-time frequency value of power network and be：
Calculate the voltage phasor of current electrical signal, according to phase and the relation of mains frequency, calculated rate deviation, and with standard frequency
Rate value is added, and obtains a frequency estimation；
Based on a frequency estimation, self-adapting reconstruction is carried out to the electric signal of the A/D modular converters sampling of reading；
Electric signal progress recursive discrete Fourier transform calculating to the A/D modular converter last samples of reading obtains new frequency
Deviation, and be added with a frequency estimation, secondary frequency estimation is obtained, that is, obtains final power network real-time frequency.
10. having the method for work of the 220V smart jacks of low frequency load shedding function as claimed in claim 9, its feature exists
In, use recursive discrete Fourier transform algorithm calculate current electrical signal voltage phasor.
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| CN201710417018.5A CN107302156B (en) | 2017-06-06 | 2017-06-06 | A kind of 220V intelligent socket and its working method with low frequency load shedding function |
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| CN201710417018.5A CN107302156B (en) | 2017-06-06 | 2017-06-06 | A kind of 220V intelligent socket and its working method with low frequency load shedding function |
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| CN107302156B CN107302156B (en) | 2019-11-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN110429619B (en) * | 2019-08-31 | 2022-08-09 | 上海交通大学 | Disaster recovery reaction method for demand side frequency emergency control of super-large-scale power grid |
| CN113205671A (en) * | 2020-10-16 | 2021-08-03 | 佳得股份有限公司 | Mobile communication low-delay distributed power system auxiliary service device and method |
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| CN107302156B (en) | 2019-11-26 |
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