CN105182250A - Non-intruding type distributed power output monitoring device - Google Patents
Non-intruding type distributed power output monitoring device Download PDFInfo
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- CN105182250A CN105182250A CN201510524436.5A CN201510524436A CN105182250A CN 105182250 A CN105182250 A CN 105182250A CN 201510524436 A CN201510524436 A CN 201510524436A CN 105182250 A CN105182250 A CN 105182250A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention discloses a non-intruding type distributed power output monitoring device, and the device comprises a sampling interface which is in plug-and-play electric connection with a common connection point interface, wherein the sampling interface carries out the sampling of a power load waveform from the common connection point interface and transmits a result to a comparison module; the comparison module which receives the power load waveform, enables the power load waveform to be compared with a plurality of distributed power typical waveform samples, obtains a distributed power waveform sample nearest to the power load waveform, and enables the nearest distributed power waveform sample to be transmitted to an analysis module; the analysis module which receives the nearest distributed power waveform sample, analyzes the sample, obtains the electric quantity information and auxiliary measurement information, and enables the electric quantity information and auxiliary measurement information to be transmitted to a feedback module; and the feedback module which is used for displaying the electric quantity information for the user, and enables the electric quantity information and auxiliary measurement information to be fed back to a power grid company through a power grid company interface.
Description
Technical field
The present invention relates to intelligent power supply field, especially, relate to a kind of non-intrusion type distributed power source and to exert oneself monitoring device.
Background technology
Distributed photovoltaic power generation can make full use of the feature that sun power extensively exists, and avoids concentrating the place limiting factor of building.Traditional distributed power supply monitoring mainly utilizes each distributed power source matrix to increase monitoring hardware unit, and the respective information transmission link information of carrying out that communicates is uploaded, and requires a great deal of time and expense in installation, operation.On the other hand, still there is not distributed power source access accounting early warning and new forms of energy start and stop monitoring function in current conventional low voltage circuit, brings a lot of trouble to the daily operation management of circuit.
The distributing access unordered for distributed power source in prior art monitors to Regulation, subsidy granting, the maintenance of circuit O&M, electric network state the problem bringing difficult management, still lacks effective solution at present.
Summary of the invention
The distributing access unordered for distributed power source in prior art monitors to Regulation, subsidy granting, the maintenance of circuit O&M, electric network state the problem bringing difficult management, the object of the invention is to propose a kind of non-intrusion type distributed power source to exert oneself monitoring device, the ruuning situation obtaining distributed power source in load cluster can be analyzed easily, be convenient to integrated, safeguard with supervise.
Based on above-mentioned purpose, technical scheme provided by the invention is as follows:
According to an aspect of the present invention, provide a kind of non-intrusion type distributed power source and to exert oneself monitoring device, comprising:
Sampling Interface, Sampling Interface is electrically connected to the points of common connection interface of low-voltage supply line and contrast module, the electric connection of Sampling Interface and points of common connection interface is that instant inserted and instant using type is electrically connected, and Sampling Interface is sampled to electrical load waveform and is sent to contrast module from points of common connection interface;
Contrast module, contrast module is electrically connected to Sampling Interface and analysis module, contrast module receives electrical load waveform, and electrical load waveform and multiple distributed power source typical waveform sample are contrasted, obtain and the immediate distributed power source waveform sample of electrical load waveform, and immediate distributed power source waveform sample is sent to analysis module;
Analysis module, analysis module is electrically connected to contrast module and feedback module, analysis module receives immediate distributed power source waveform sample, carries out analysis and obtains information about power and subsidiary information, and information about power and subsidiary information are sent to feedback module to this sample;
Feedback module, feedback module is electrically connected to analysis module and grid company interface, and feedback module is used for showing information about power to user, and will feed back to grid company with information about power and subsidiary information by grid company interface.
Wherein, the points of common connection of low-voltage supply line is arranged at transformer by total cabinet, Sampling Interface is electrically connected to transformer by total cabinet lower end, and Sampling Interface is sampled as Sampling Interface to electrical load waveform and detects the output current of distributed power source on points of common connection by CT current transformer from points of common connection interface.
Wherein, also comprise harmonic separation module, be electrically connected as being electrically connected by harmonic separation module between Sampling Interface and contrast module between Sampling Interface and contrast module, harmonic separation module receives the electrical load waveform of Sampling Interface, use Fast Fourier Transform (FFT) to go out harmonic wave from electrical load waveform extracting, and send harmonic wave to contrast module.
And, harmonic separation module uses Fast Fourier Transform (FFT) to go out harmonic wave from electrical load waveform extracting, for electrical load waveform is evenly chosen multiple point and acquisition discrete-time signal of sampling at selected point place by harmonic separation module within each cycle, re-use Fast Fourier Transform (FFT) and extract harmonic wave from discrete-time signal, wherein, the sample frequency of discrete-time signal is greater than the twice of discrete-time signal band width.
Meanwhile, also comprise typical harmonic wave storehouse, typical harmonic wave storehouse is electrically connected to contrast module; Electrical load waveform and multiple distributed power source typical waveform contrast by contrast module, for harmonic separation module contrasts from the multiple harmonic wave samples the isolated harmonic wave of electrical load waveform and typical harmonic wave storehouse by contrast module; Contrast module obtains and the immediate distributed power source waveform sample of electrical load waveform, for contrast module obtains and the harmonic wave sample in the immediate typical harmonic wave storehouse of harmonic wave of electrical load waveform.
Wherein, information about power is distributed power source output power information within a certain period of time, and subsidiary information is the check information of information about power authenticity, comprise following one of at least: amplitude, frequency, the phase place of harmonic wave each signal; Grid company is by the authenticity of the subsidiary Information Authentication information about power of grid company interface.
And, grid company, by the authenticity of the subsidiary Information Authentication information about power of grid company interface, independently calculates actual information about power for grid company by the subsidiary information of grid company interface and actual information about power and the information about power received is carried out high order comparison.
Above-mentioned distributed power source is distributed photovoltaic power generation power supply, and output voltage is the industrial voltage of 380V.
As can be seen from above, technical scheme provided by the invention is by adopting non-intrusion type interface collection and analytic signal, the duty of Real-time Obtaining distributed power source also realizes the detection of multiple goal state, can be arranged at flexibly in closed distributed power supply system and not to affect the work of original system; Meanwhile, the technical scheme using typical harmonic wave storehouse and harmonic wave to compare to obtain subsidiary information the most accurately improves can the data precision of ruuning situation of distributed power source, has further facilitated maintenance and the supervision of distributed power source cluster.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structured flowchart of monitoring device of exerting oneself according to a kind of non-intrusion type distributed power source of the embodiment of the present invention.
Embodiment
Clearly understand for making the object, technical solutions and advantages of the present invention, below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical scheme in the embodiment of the present invention carry out further clear, complete, describe in detail, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
According to embodiments of the invention, provide a kind of non-intrusion type distributed power source and to exert oneself monitoring device.
As shown in Figure 1, the non-intrusion type distributed power source provided according to embodiments of the invention monitoring device of exerting oneself comprises:
Sampling Interface 11, Sampling Interface 11 is electrically connected to the points of common connection interface of low-voltage supply line and contrast module 12, Sampling Interface 11 is that instant inserted and instant using type is electrically connected with the electric connection of points of common connection interface, and Sampling Interface 11 is sampled to electrical load waveform and is sent to contrast module 12 from points of common connection interface;
Contrast module 12, contrast module 12 is electrically connected to Sampling Interface 11 and analysis module 13, contrast module 12 receives electrical load waveform, and electrical load waveform and multiple distributed power source typical waveform sample are contrasted, obtain and the immediate distributed power source waveform sample of electrical load waveform, and immediate distributed power source waveform sample is sent to analysis module 13;
Analysis module 13, analysis module 13 is electrically connected to contrast module 12 and feedback module 14, analysis module 13 receives immediate distributed power source waveform sample, analysis is carried out to this sample and obtains information about power and subsidiary information, and information about power and subsidiary information are sent to feedback module 14;
Feedback module 14, feedback module 14 is electrically connected to analysis module 13 and grid company interface, and feedback module 14 for showing information about power to user, and will feed back to grid company with information about power and subsidiary information by grid company interface.
Wherein, the points of common connection of low-voltage supply line is arranged at transformer by total cabinet, Sampling Interface 11 is electrically connected to transformer by total cabinet lower end, and Sampling Interface 11 is sampled as Sampling Interface 11 to electrical load waveform and detects the output current of distributed power source on points of common connection by CT current transformer from points of common connection interface.
Wherein, also comprise harmonic separation module, be electrically connected as being electrically connected by harmonic separation module between Sampling Interface 11 and contrast module 12 between Sampling Interface 11 and contrast module 12, harmonic separation module receives the electrical load waveform of Sampling Interface 11, use Fast Fourier Transform (FFT) to go out harmonic wave from electrical load waveform extracting, and harmonic wave is sent to contrast module 12.
And, harmonic separation module uses Fast Fourier Transform (FFT) to go out harmonic wave from electrical load waveform extracting, for electrical load waveform is evenly chosen multiple point and acquisition discrete-time signal of sampling at selected point place by harmonic separation module within each cycle, re-use Fast Fourier Transform (FFT) and extract harmonic wave from discrete-time signal, wherein, the sample frequency of discrete-time signal is greater than the twice of discrete-time signal band width.
Meanwhile, also comprise typical harmonic wave storehouse, typical harmonic wave storehouse is electrically connected to contrast module 12; Electrical load waveform and multiple distributed power source typical waveform contrast by contrast module 12, for harmonic separation module contrasts from the multiple harmonic wave samples the isolated harmonic wave of electrical load waveform and typical harmonic wave storehouse by contrast module 12; Contrast module 12 obtains and the immediate distributed power source waveform sample of electrical load waveform, for contrast module 12 obtains and the harmonic wave sample in the immediate typical harmonic wave storehouse of harmonic wave of electrical load waveform.
Wherein, information about power is distributed power source output power information within a certain period of time, and subsidiary information is the check information of information about power authenticity, comprise following one of at least: amplitude, frequency, the phase place of harmonic wave each signal; Grid company is by the authenticity of the subsidiary Information Authentication information about power of grid company interface.
And, grid company, by the authenticity of the subsidiary Information Authentication information about power of grid company interface, independently calculates actual information about power for grid company by the subsidiary information of grid company interface and actual information about power and the information about power received is carried out high order comparison.
Above-mentioned distributed power source is distributed photovoltaic power generation power supply, and output voltage is the industrial voltage of 380V.
When the load of non-intrusion type load detection method Main Basis is started, different loads has its different characteristics (meritorious, idle and harmonic wave), whole electrical load waveform is caused to change, utilize changed power information feature, realize the identification of load, monitoring system utilizes when single load input, excision carries out load judgment to the signal intensity that electric power supply porch system produces.The method has the accurate feature of identification in fast, the single mini system of recognition speed, but accurate not to single equipment identification in Iarge-scale system.Distributed power source monitoring device utilizes non-intrusion type feature to realize detecting in conjunction with fft algorithm, distributed power source plug and play monitoring device is arranged on user's side transformer by total cabinet lower end, user side current detecting is carried out by CT current transformer, by decomposing distributed steady-state current (first-harmonic and harmonic wave), medium-term and long-term in conjunction with photovoltaic power generation quantity, short-term and real-time go out force estimation, set up the Multiple Time Scales computation model that distributed photovoltaic is exerted oneself, by distributed photovoltaic power generation, the impact of steady-state current is affected, time domain is utilized to convert frequency-domain analysis method to, distributed photovoltaic is exerted oneself and calculates.
Basis fourier series analysis (FFT), carrying out sampling calculating according to collecting transformer end opening current value, utilizing Fast Fourier Transform (FFT) finally to obtain required harmonic wave.When utilizing Fourier series continuous time, periodic function analyzed to non-sinusoidal, the one-period T decile of continuous time signal is got N number of point, carry out sampling at Along ent and obtain series of discrete time signal, then adopt FFT to carry out frequency analysis, finally draw the amplitude of required individual harmonic current, frequency and phase place.Measuring Time is the integral multiple of signal period or sample frequency when being greater than sampling rate (2 times of bandlimited signal band width) of minimum permission, and frequency image is more clear.The frequency analysis of FFT is
i
a(t)
t＝I
a1,·cos(ωt+θ
a1)+.......+I
ak,·cos(kωt+θ
ak)+....
I
ak＝a
ak,·I
a1
Wherein, I
akrepresent the amplitude of kth order harmonic components in working current, k ω represents the angular frequency of kth order harmonic components in working current.
In distributed power source model buildings, carry out distributed photovoltaic output current to emulate, first the typical current waveform of all kinds of distributed photovoltaic power generation is obtained, current sampling device is utilized normally to work to certain distributed photovoltaic according to certain sample frequency (as every cycle is sampled 256 points) and the electric current (comprising harmonic wave) of ruuning situation under all kinds of weather condition is sampled in a large number, then statistics screening is carried out to these current samples, electric current (comprising harmonic wave) information when obtaining reflecting that distributed photovoltaic system equipment normally works under state, final assimilated equations distributed photovoltaic power generation carries out high order comparison to the harmonic current that electric system is impacted, distributed photovoltaic start and stop monitoring and power generation computing function is carried out by harmonic electric quantity algorithm.
The regulation of current basis " modular design of distributed photovoltaic connecting system ", adopt 380 volts of distributed photovoltaic power generations accessed to only need to grid company and upload information about power, lack effective subsidiary information, make the supervision of the electricity volume of distributed generation system become difficulty.Therefore carry out distributed power source plug and play monitoring device to promote, for Utilities Electric Co. provides the application of photovoltaic generation industry distributed photovoltaic, electricity consumption guidance, electric power value-added service to provide necessary means, to be exerted oneself situation by the effective Computation distribution formula of distributed photovoltaic power calculation simultaneously, effective reduction user adopts unlawful means to gain the information of subsidy (stealing) by cheating, conscientiously safeguards Utilities Electric Co.'s number one.In industry portion efficiently solves by the distributed photovoltaic monitoring of non-intrusion type the ruuning situation utilizing electric supply meter to monitor indoor electric equipment simultaneously, for user power utilization guidance, economic electrical energy consumption analysis and pertinent value added services provide support.
In sum, by means of technique scheme of the present invention, by adopting non-intrusion type interface collection analytic signal, the duty of Real-time Obtaining distributed power source also realizes the detection of multiple goal state, can be arranged at flexibly in closed distributed power supply system and not to affect the work of original system; Meanwhile, the technical scheme using typical harmonic wave storehouse and harmonic wave to compare to obtain subsidiary information the most accurately improves can the data precision of ruuning situation of distributed power source, has further facilitated maintenance and the supervision of distributed power source cluster.
Those of ordinary skill in the field are to be understood that: the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. non-intrusion type distributed power source is exerted oneself a monitoring device, it is characterized in that, comprising:
Sampling Interface, described Sampling Interface is electrically connected to the points of common connection interface of low-voltage supply line and contrast module, the electric connection of described Sampling Interface and points of common connection interface is that instant inserted and instant using type is electrically connected, and described Sampling Interface is sampled to electrical load waveform and is sent to contrast module from described points of common connection interface;
Contrast module, described contrast module is electrically connected to described Sampling Interface and analysis module, described contrast module receives described electrical load waveform, and described electrical load waveform and multiple distributed power source typical waveform sample are contrasted, obtain and the immediate distributed power source waveform sample of described electrical load waveform, and described immediate distributed power source waveform sample is sent to analysis module;
Analysis module, described analysis module is electrically connected to described contrast module and feedback module, described analysis module receives described immediate distributed power source waveform sample, analysis is carried out to this sample and obtains information about power and subsidiary information, and described information about power and subsidiary information are sent to feedback module;
Feedback module, described feedback module is electrically connected to described analysis module and grid company interface, described feedback module is used for showing described information about power to user, and will feed back to grid company with described information about power and subsidiary information by described grid company interface.
2. a kind of non-intrusion type distributed power source according to claim 1 is exerted oneself monitoring device, it is characterized in that, the points of common connection of described low-voltage supply line is arranged at transformer by total cabinet, described Sampling Interface is electrically connected to described transformer by total cabinet lower end, and described Sampling Interface is sampled as described Sampling Interface to electrical load waveform and detects the output current of distributed power source on points of common connection by CT current transformer from described points of common connection interface.
3. a kind of non-intrusion type distributed power source according to claim 1 is exerted oneself monitoring device, it is characterized in that, also comprise harmonic separation module, be electrically connected as to be electrically connected by described harmonic separation module between described Sampling Interface and described contrast module between described Sampling Interface and described contrast module, described harmonic separation module receives the electrical load waveform of described Sampling Interface, use Fast Fourier Transform (FFT) to go out harmonic wave from described electrical load waveform extracting, and send described harmonic wave to described contrast module.
4. a kind of non-intrusion type distributed power source according to claim 3 is exerted oneself monitoring device, it is characterized in that, described harmonic separation module uses Fast Fourier Transform (FFT) to go out harmonic wave from described electrical load waveform extracting, for described electrical load waveform is evenly chosen multiple point and acquisition discrete-time signal of sampling at selected point place by described harmonic separation module within each cycle, re-use Fast Fourier Transform (FFT) and extract harmonic wave from discrete-time signal, wherein, the sample frequency of described discrete-time signal is greater than the twice of discrete-time signal band width.
5. a kind of non-intrusion type distributed power source according to claim 3 is exerted oneself monitoring device, and it is characterized in that, also comprise typical harmonic wave storehouse, described typical harmonic wave storehouse is electrically connected to described contrast module; Described electrical load waveform and multiple distributed power source typical waveform contrast by described contrast module, for described harmonic separation module contrasts from the multiple harmonic wave samples the isolated harmonic wave of described electrical load waveform and described typical harmonic wave storehouse by described contrast module; Described contrast module obtains and the immediate distributed power source waveform sample of described electrical load waveform, for described contrast module obtains and the harmonic wave sample in the immediate described typical harmonic wave storehouse of harmonic wave of described electrical load waveform.
6. a kind of non-intrusion type distributed power source according to claim 1 is exerted oneself monitoring device, it is characterized in that, described information about power is distributed power source output power information within a certain period of time, described subsidiary information is the check information of described information about power authenticity, comprise following one of at least: amplitude, frequency, the phase place of harmonic wave each signal; Grid company by described grid company interface described subsidiary Information Authentication described in the authenticity of information about power.
7. a kind of non-intrusion type distributed power source according to claim 6 is exerted oneself monitoring device, it is characterized in that, grid company by described grid company interface described subsidiary Information Authentication described in the authenticity of information about power, for the described subsidiary information of grid company by described grid company interface independently calculates actual information about power and described actual information about power and the information about power received are carried out high order comparison.
8. to exert oneself monitoring device according to a kind of non-intrusion type distributed power source in claim 1-7 described in any one, it is characterized in that, described distributed power source is distributed photovoltaic power generation power supply, and output voltage is the industrial voltage of 380V.
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Inventor after: Li Siwei Inventor after: Liu Zhuochu Inventor after: Leng Man Inventor after: Wang Sining Inventor after: Wu Wenzhao Inventor after: Liu Zhiyong Inventor before: Li Siwei Inventor before: Liu Zhuochu |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |