CN204068286U - Based on the micro-grid connection device of technology of frequency tracking - Google Patents
Based on the micro-grid connection device of technology of frequency tracking Download PDFInfo
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- CN204068286U CN204068286U CN201420450343.3U CN201420450343U CN204068286U CN 204068286 U CN204068286 U CN 204068286U CN 201420450343 U CN201420450343 U CN 201420450343U CN 204068286 U CN204068286 U CN 204068286U
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- 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
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- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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Abstract
The utility model relates to a kind of micro-grid connection device based on technology of frequency tracking, its technical characteristics: comprise CPU element and coupled power subsystem, communication unit, frequency senser, data acquisition unit, open into unit and output unit, this communication unit is connected with micro-capacitance sensor controller and carries out function of interaction control, this open into unit with output the grid-connected point breaker of unit and be connected and be respectively used to gather remote signalling amount information and export guidance command, this frequency senser is connected to main grid side and micro-capacitance sensor side for measuring main grid side and micro-capacitance sensor side frequency, this Data Data collecting unit and main grid side are connected with micro-capacitance sensor side the telemetered signal amount for gathering main grid side and micro-capacitance sensor.The utility model some distributed power sources overcome in micro-capacitance sensor affect very greatly by outside climatic condition, frequency often fluctuates and causes sampling error problem, there is practical, reliability and accuracy high, meet user to the quality of power supply and power supply safety requirement.
Description
Technical field
The utility model belongs to micro-capacitance sensor technical field, especially a kind of micro-grid connection device based on technology of frequency tracking.
Background technology
Along with the exhaustion gradually of conventional energy resource and day by day increasing the weight of of environmental pollution, countries in the world growing interest distributed generation technology.Constantly bringing forth new ideas of distributed generation technology, distributed electrical Source Type develops into and mainly comprises miniature combustion engine, solar-energy photo-voltaic cell, wind-driven generator, storage battery, flywheel etc.As the important composition form of distributed power generation; the small-sized electric system of being transported to that micro-capacitance sensor is collected by distributed power source, energy storage device, energy converter, associated loadings, supervisory control system, protection system, power transmitting device etc. usually, be one can teaching display stand control, the autonomous system of protect and manage.
Micro-capacitance sensor both by power distribution network and the parallel running of large-scale power net, can form the combined operation system of a large-scale power grid and small grids, also can independently for local load provides electricity needs.Under main electrical network normal condition, micro-capacitance sensor needs steady in a long-term operation; When bulk power grid fault, micro-capacitance sensor must depart from main electrical network fast, enters and is held in islet operation, and after bulk power grid failture evacuation, auto-parallel runs again; When micro-capacitance sensor breaks down, same needs excise micro-capacitance sensor fast.Due to some distributed power sources in micro-capacitance sensor, as wind power generation and solar power generation, affect very large by outside climatic condition, frequency often fluctuates and causes the error of sampling, therefore, how stablizing, reliably implementing micro-grid connection is problem in the urgent need to address at present.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of reasonable in design, reliable and stable micro-grid connection device based on technology of frequency tracking.
The utility model solves its technical problem and takes following technical scheme to realize:
A kind of micro-grid connection device based on technology of frequency tracking, comprise CPU element and coupled power subsystem, communication unit, frequency senser, data acquisition unit, open into unit and output unit, this communication unit is connected with micro-capacitance sensor controller and carries out function of interaction control, this is opened to be connected with grid-connected point breaker into unit and gathers remote signalling amount information, this is outputed unit and to be connected with grid-connected point breaker output guidance command, this frequency senser is connected to main grid side and micro-capacitance sensor side for measuring main grid side and micro-capacitance sensor side frequency, this Data Data collecting unit and main grid side are connected with micro-capacitance sensor side the telemetered signal amount for gathering main grid side and micro-capacitance sensor.
And described opening comprises six tunnel remote signalling amount input units into unit, is respectively used to gather grid-connected point breaker position signalling, energy storing of switch alarm signal and distributed electrical source inventer alarm signal.
And described unit of outputing comprises four tunnel remote control output units, correspondence opens a sluice gate control, shutting-brake control respectively, failure removal controls and simultaneous interconnecting controls.
And, described frequency senser comprises Zero-cross comparator transport and placing device LM258 and optocoupler HCPL-070L, the input of Zero-cross comparator transport and placing device LM258 is connected to micro-capacitance sensor three-phase and the main electrical network A phase voltage AC signal through PT secondary side, and the output of Zero-cross comparator transport and placing device LM258 is converted to unipolarity analog quantity through optocoupler HCPL-070L isolation and is input to the catching on interface of CPU element.
And described data acquisition unit is by gathering pretreatment module and A/D modular converter connects and composes for gathering eight tunnel telemetered signal amounts.
And described communication unit is RS232 interface or RS485 interface.
And described CPU element also connects a human-computer interaction module and realizes human-computer interaction function.
And described CPU element also connects an external memory storage for storing data.
And described CPU element also connects a JTAG emulation interface unit and is used for realizing artificial debugging function.
And described CPU element adopts ARM7TDMI-STM microcontroller.
Advantage of the present utility model and good effect are:
1, the utility model adopts the technology of frequency tracking adjustment sampling period to carry out data acquisition, some distributed power sources overcome in micro-capacitance sensor affect very greatly by outside climatic condition, frequency often fluctuates and causes sampling error problem, can Measurement accuracy micro-capacitance sensor side voltage accurate judgement is grid-connected, off-grid condition, there is practical, reliability and accuracy high, meet user to the quality of power supply and power supply safety requirement.
2, the utility model uses micro-grid connection device to carry out effective monitoring to the remote signalling of micro-grid connection point, remote measurement, remote-control data; realize the comprehensive monitoring to micro-capacitance sensor and defencive function; there is data acquisition, electric energy copied and accepted, the warning of island protect, failure removal, abnormal information, switching control, cutting-in control, the integrated function such as electric energy quality monitoring, ensure that the normal operation of network system.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of micro-grid connection device of the present utility model;
Fig. 2 is frequency senser circuit theory diagrams;
Fig. 3 is that the signal of frequency senser changes schematic diagram;
Fig. 4 is that sample sequence of the present utility model obtains logical flow chart;
Fig. 5 is the utility model simultaneous interconnecting, off-grid logic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is further described:
A kind of micro-grid connection device based on technology of frequency tracking, as shown in Figure 1, comprise CPU element, power subsystem, external memory storage, communication unit, frequency senser, data acquisition unit, open into unit, output unit, human and machine interface unit and JTAG emulation interface unit, CPU element respectively with power subsystem, external memory storage, communication unit, frequency senser, data acquisition unit, open into unit, output unit, human and machine interface unit is connected with JTAG emulation interface unit.In the present embodiment, CPU element uses LPC2214 microcontroller, this microcontroller is the microcontroller of 16/32 ARM7TDMI-STMCPU supporting real-time simulation and tracking based on, and can 60MHz be reached with the high speed flash storage dominant frequency that 256KB embeds, extend out 4Mb external RAM working procedure, and the EEPROM memory circuit (external memory storage) extending out 512Kb is for storing data, logout etc.Described communication unit uses RS232 or RS485 module and can communicate with host computer.Described human and machine interface unit comprises liquid crystal display, the display of LED stand by lamp and key-press input.JTAG emulation interface unit is used for being connected with outer computer realizing software debugging and upgrade function as an emulation interface.
Open and comprise six tunnel remote signalling amount input units into unit, for gathering grid-connected point breaker position signalling, energy storing of switch alarm signal and distributed electrical source inventer alarm signal etc., the input of+12V level is after RC network anti-interference filtration, converted by light-coupled isolation and be input to CPU element, CPU element often obtains through a time interval scans I/O signals collecting.
Output unit and comprise four tunnel remote control output units, every road remote control second mate idle contact exports, two road normal opened contacts, two road normally closed contacts or a Lu Changkai, a road normally closed contact can be arranged to, main actions output combined floodgate, output tripping operation and alarm export, for conjunction, the jumping control of circuit breaker, electric knife gate.The corresponding switching of four tunnel remote controls controls, failure removal function, and wherein a road is used as simultaneous interconnecting control.
Frequency senser is for measuring main grid side and micro-capacitance sensor side frequency, the collection default condition of main grid side frequency with A phase voltage for benchmark, consider the possibility of micro-capacitance sensor three-phase imbalance problem, need to measure micro-capacitance sensor three-phase voltage frequency, gather the frequency-splitting calculating both sides when the data obtained is used for simultaneous interconnecting.As shown in Figure 2, frequency senser comprises Zero-cross comparator transport and placing device LM258 and optocoupler HCPL-070L, micro-capacitance sensor three-phase and main electrical network A phase are through the voltage AC signal of PT secondary side, input U13 Zero-cross comparator transport and placing device LM258, output low level 0V, high level+12V voltage, then isolate through U15 optocoupler HCPL-070L, be converted to the analog quantity of unipolarity 0 ~+3.3V, input ARM catches pin, and wherein R37 is that 5.1K Ω is used as current limliting, and R40 is that 10K Ω is as drawing high signal CAP1.As shown in Figure 3, frequency senser changes grabber 1 input CAPl.0, CAPl.1, CAPl.2, CAPl.3 that the signal exported receives CPU element, the time base T1 of grabber made by Timer1 timer, grabber can catch the time (representing with the variation delta T of Timer1 counter) in two pulse spacings, system clock frequency f
pCLK, can calculate wave period in week and frequency f like this, computing formula is:
f＝f
PCLK/ΔT (1)
Data acquisition unit comprises collection preliminary treatment and A/D modular converter, gathers eight tunnel telemetered signal amounts, comprises grid side A phase voltage, electric current, the three-phase voltage of micro-capacitance sensor side, electric current.Remote measurement amount changes strong ac signal (5A/100V) into inner weak electric signal without distortion by the high-precision current in terminal and voltage transformer, after filtering process, enter A/D chip carry out analog-to-digital conversion, digital signal after conversion calculates through CUP unit (ARM), obtains the three-phase voltage current value of micro-capacitance sensor side and main grid side phase voltage current value.The process of this telemetered signal amount have employed high-speed and high-density synchronized sampling, automatic frequency tracking technology also has the fft algorithm improved, so precision is fully guaranteed, the measurement and process that gain merit in micro-capacitance sensor side, idle and electric energy is from first-harmonic to higher harmonic components can be completed.
In AC sample system, owing to adopting fft algorithm, normally cycle is sampled the charge value of 32 points, 64 or 128, then processes these data.If mains frequency is constant, then sampling interval T
s=T/N (T is the cycle, and N is sampled point), and under the frequency of micro-capacitance sensor has certain fluctuation situation usually, fixed sample interval down-sampling is counted and is not fixed, so want Adjustable calculation method.This remote measurement is constant according to mains frequency is 50Hz, adopt cycle 32 point sampling, then the sampling interval is
T
S＝0.02s/32＝625μs (2)
Within 625 μ s sampling intervals, through A/D chip sampling obtain 32 point sampling sequences be x (k) (k=0,1,2 ..., 31).When frequency changes, the sampled value of of ac adopts Lagrangian Arithmetic to revise in real time, obtains new sample sequence, can ensure the precision that of ac calculates.
Lagrange interpolation adopts the method for function approximation, tries to achieve interpolation point by building multinomial.When building the degree of polynomial and being higher, then interpolation error is less.In actual applications, consider the allowed band of operand convenience and interpolation error, we adopt a Lagrange interpolation algorithm (linear interpolation) usually, can obtain promising result.Be located at f
sthe sample sequence obtained under the fixed sampling frequency of=50Hz is x (k)=x (kT
s) (k=0,1,2 ..., 31), the frequency having been recorded micro-capacitance sensor voltage signal by frequency senser algorithm is f, and the corresponding sampling period is T ', and its desirable sample sequence should be
y(k)＝x(kT’)＝x[kf
S/(fT
S))] (3)
Due to kf
s/ (fT
s) not generally integer, therefore can carry out linear interpolation its adjacent 2.If a=kf
s/ f, and establish b to be the maximum integer being less than a, y (k) is carried out linear interpolation between u (b) and u (b+1), obtains new sample sequence y (k) (k=0 like this, 1,2 ..., 31), use fft algorithm again, finally calculate main grid side A phase voltage electric current, calculate the three-phase voltage current of micro-capacitance sensor side from first-harmonic to higher harmonic components, process acquisition is meritorious, idle.
In order to reduce the impact that micro-grid connection causes electrical network, require configuration simultaneous interconnecting function.During the same period, require that the difference on the frequency of distributed power source Generation Side and power distribution network side and voltage difference meet certain requirements.According to data sampling and operation result, record the amplitude of micro-capacitance sensor three-phase voltage current and main grid side A phase, phase angle, frequency values, calculate voltage difference, phase difference value, the frequency-splitting of micro-capacitance sensor and main grid side.Meet difference on the frequency at the same time and be not more than F
hQmax, voltage difference is not more than definite value U
hQmax, the same period angle be not more than definite value Ang
hQmaxcondition under, receive grid-connected combined floodgate order, carry out grid-connected feed motion.Simultaneous interconnecting and off-grid action logic as shown in Figure 5, difference on the frequency, voltage difference definite value, the same period angle definite value and time definite value can adjust separately, setting principle: synchronous voltage difference operating value U
hQmaxdesirable (5 ~ 10) V, the same period differential seat angle operating value Ang
hQmaxdesirable (5 ~ 10), the same period difference on the frequency operating value F
hQmaxdesirable (1 ~ 2) Hz, the desirable 2s ~ 3s of operation time limit Tnp.
It is emphasized that; embodiment described in the utility model is illustrative; instead of it is determinate; therefore the utility model comprises the embodiment be not limited to described in embodiment; every other execution modes drawn according to the technical solution of the utility model by those skilled in the art, belong to the scope of the utility model protection equally.
Claims (10)
1. the micro-grid connection device based on technology of frequency tracking, it is characterized in that: comprise CPU element and coupled power subsystem, communication unit, frequency senser, data acquisition unit, open into unit and output unit, this communication unit is connected with micro-capacitance sensor controller and carries out function of interaction control, this is opened to be connected with grid-connected point breaker into unit and gathers remote signalling amount information, this is outputed unit and to be connected with grid-connected point breaker output guidance command, this frequency senser is connected to main grid side and micro-capacitance sensor side for measuring main grid side and micro-capacitance sensor side frequency, this Data Data collecting unit and main grid side are connected with micro-capacitance sensor side the telemetered signal amount for gathering main grid side and micro-capacitance sensor.
2. the micro-grid connection device based on technology of frequency tracking according to claim 1, it is characterized in that: described opening comprises six tunnel remote signalling amount input units into unit, is respectively used to gather grid-connected point breaker position signalling, energy storing of switch alarm signal and distributed electrical source inventer alarm signal.
3. the micro-grid connection device based on technology of frequency tracking according to claim 1, is characterized in that: described unit of outputing comprises four tunnel remote control output units, and correspondence opens a sluice gate control, shutting-brake control respectively, failure removal controls and simultaneous interconnecting controls.
4. the micro-grid connection device based on technology of frequency tracking according to claim 1, it is characterized in that: described frequency senser comprises Zero-cross comparator transport and placing device LM258 and optocoupler HCPL-070L, the input of Zero-cross comparator transport and placing device LM258 is connected to micro-capacitance sensor three-phase and the main electrical network A phase voltage AC signal through PT secondary side, and the output of Zero-cross comparator transport and placing device LM258 is converted to unipolarity analog quantity through optocoupler HCPL-070L isolation and is input to the catching on interface of CPU element.
5. the micro-grid connection device based on technology of frequency tracking according to claim 1, is characterized in that: described data acquisition unit is by gathering pretreatment module and A/D modular converter connects and composes for gathering eight tunnel telemetered signal amounts.
6. the micro-grid connection device based on technology of frequency tracking according to claim 1, is characterized in that: described communication unit is RS232 interface or RS485 interface.
7. the micro-grid connection device based on technology of frequency tracking according to any one of claim 1 to 6, is characterized in that: described CPU element also connects a human-computer interaction module and realizes human-computer interaction function.
8. the micro-grid connection device based on technology of frequency tracking according to any one of claim 1 to 6, is characterized in that: described CPU element also connects an external memory storage for storing data.
9. the micro-grid connection device based on technology of frequency tracking according to any one of claim 1 to 6, is characterized in that: described CPU element also connects a JTAG emulation interface unit and is used for realizing artificial debugging function.
10. the micro-grid connection device based on technology of frequency tracking according to any one of claim 1 to 6, is characterized in that: described CPU element adopts ARM7TDMI-STM microcontroller.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074928A (en) * | 2021-04-02 | 2021-07-06 | 珠海思创电气有限公司 | Distribution automation thing allies oneself with sensing system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074928A (en) * | 2021-04-02 | 2021-07-06 | 珠海思创电气有限公司 | Distribution automation thing allies oneself with sensing system |
| CN113074928B (en) * | 2021-04-02 | 2024-05-03 | 珠海思创电气有限公司 | Automatic distribution internet of things sensing system |
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Address after: 300010 Tianjin city Hebei District Wujing Road No. 39 Patentee after: State Grid Corporation of China Patentee after: STATE GRID TIANJIN ELECTRIC POWER Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: STATE GRID TIANJIN ELECTRIC POWER Co. |
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Granted publication date: 20141231 |