CN103076522A - Device and method for measuring tide directions of photovoltaic grid-connected power generation and commercial power - Google Patents
Device and method for measuring tide directions of photovoltaic grid-connected power generation and commercial power Download PDFInfo
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- CN103076522A CN103076522A CN2012105921687A CN201210592168A CN103076522A CN 103076522 A CN103076522 A CN 103076522A CN 2012105921687 A CN2012105921687 A CN 2012105921687A CN 201210592168 A CN201210592168 A CN 201210592168A CN 103076522 A CN103076522 A CN 103076522A
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Abstract
The invention discloses a device and a method for measuring the tide directions of photovoltaic grid-connected power generation and commercial power. The device is arranged on a three-phase circuit; a first mutual inductor and a second mutual inductor for sampling the magnitude and direction of current are arranged between a grid-connected side and a load side as well as between a commercial power side and the load side respectively; the measuring device comprises a singlechip microcomputer; the singlechip microcomputer is provided with a sampling interface; the first and second mutual inductors are connected with the sampling interface respectively; and the singlechip microcomputer is used for processing current information sampled by using the sampling interface and displaying through a display device. The device and the method have the beneficial effects that the tide directions of photovoltaic grid-connected power generation and commercial power supply can be judged intuitively, the power source information of a power using load at a certain moment can be obtained instantaneously, real-time current data are displayed through the display device, relevant personnel can operate and judge conveniently, the working efficiency is effectively increased, the error rate is lowered, high practicability is realized.
Description
Technical field
The present invention relates to a kind of power measurement device, be specifically related to a kind of parallel network power generation and civil power direction of tide measurement mechanism and method.
Background technology
Usually be incorporated into the power networks with civil power grid-connected at present, become one of main source of various fields electricity consumption.In the existing grid-connected system, grid-connected photovoltaic system and the civil power rear staff of being incorporated into the power networks can not obviously find out concrete power supply situation, namely be difficult to understand is parallel network power generation at powering load or civil power at powering load, particularly in the process of the test that is incorporated into the power networks, can't demonstrate the direction of tide that is incorporated into the power networks with civil power can affect be incorporated into the power networks the process journey of test and the project progress of parallel network power generation project to a great extent.
Summary of the invention
The object of the present invention is to provide a kind of parallel network power generation and civil power direction of tide measurement mechanism and method, electric current by adopting the single chip computer measurement mutual inductor also generates measurement data, overcome the deficiency that existing electric device is difficult to judge parallel network power generation and civil power generating trend, thereby realized purpose of the present invention.
Technical matters solved by the invention can realize by the following technical solutions:
A kind of parallel network power generation and civil power direction of tide measurement mechanism, it is located on the three-phase circuit, and three-phase circuit is respectively A phase, B phase and C mutually, and be Y-connection and angle between this A, B, the C three-phase circuit and differ 120 °, wherein:
The three-phase circuit outside is for connecting the grid-connected side that is incorporated into the power networks, and is inboard for connecting the civil power side of utility grid, civil power side and the load-side for being connected with load between the side that is incorporated into the power networks;
Be provided with first, second mutual inductor of measuring size of current and direction on every circuitry phase, the first mutual inductor is incorporated into the power networks between side and the load-side this circuitry phase, and the second mutual inductor is between the civil power side and load-side of this circuitry phase;
Measurement mechanism also comprises a single-chip microcomputer, which is provided with sample connection, respectively with three-phase circuit on mutual inductor interconnect, be used for current information, the sample time of sample connection sampling being calculated and judging current trend, generated output.
In a preferred embodiment of the invention, first, second mutual inductor is the double-winding current mutual inductor, and double winding wherein is respectively applied to the size and Orientation of sampling current.
In a preferred embodiment of the invention, single-chip microcomputer is provided with a digital-to-analogue conversion module and a memory module, the digital-to-analogue conversion module is used for the current information of sampling is converted into digital signal, memory module is used for digital signal, the sample time of current information are stored as data, generates chart and pass through a display device to show.
In a preferred embodiment of the invention, single-chip microcomputer comprises a filtering module, and it is used for the invalid turbulent filtering with the electric current of sampling.
A kind of parallel network power generation and civil power direction of tide measuring method, wherein, the method comprises the steps:
1) between grid-connected and load, civil power and load, mutual inductor is set;
2) current information on the mutual inductor between grid-connected side and load-side, civil power side and the load-side on the three-phase circuit is taken a sample, the time of this current instantaneous value of simultaneously record sampling, wherein, current information comprises the size and Orientation of electric current;
The current information of the mutual inductor sampling on the current information of 3) mutual inductor between grid-connected side and the load-side on every circuitry phase being taken a sample and this circuitry phase between civil power side and the load-side compares, and judges that accordingly the load electricity consumption is from parallel network power generation or mains-supplied.
In a preferred embodiment of the invention, if the current information of taking a sample is forward, judge that then load is by grid-connected power supply on the mutual inductor between grid-connected side and the load-side; If the current instantaneous value of taking a sample is forward, judge that then load passes through mains-supplied on the mutual inductor between civil power side and the load-side.
In a preferred embodiment of the invention, measuring method is stored in judgement complete rear current instantaneous value and the sample time that each current transformer is taken a sample, and generates chart and pass through a display device to show.
In a preferred embodiment of the invention, before the current instantaneous value to sampling calculates, judges, first invalid turbulent flow is carried out filtering.
Principle of work of the present invention is as follows:
The AD sample connection of single-chip microcomputer is processed the electric current that first, second mutual inductor of being located on A, B, the C three-phase circuit is taken a sample respectively, and two windings on first, second mutual inductor are respectively applied to the size and Orientation of sampling current; Single-chip microcomputer stores size of current, direction and the sample time of sampling and judgement, the invalid turbulent flow of simultaneously filtering; Single-chip microcomputer shows by chart electric current and the sample time of sampling, wherein, if the sampling current of the first mutual inductor is forward, judges that then the power supply of load-side is from the side that is incorporated into the power networks in display device; If the sampling current of the second mutual inductor is forward, judge that then the power supply of load-side is from the civil power side.
Beneficial effect of the present invention is:
Realized the intuitive judgment of the trend trend of parallel network power generation and mains-supplied, can immediately learn electricity consumption load power source information at a time, and real-time current data shown by display device, be very easy to related personnel's operation and judgement, effectively promote work efficiency, and the reduction error rate, have higher practicality.
Description of drawings
Fig. 1 is the structure principle chart of a kind of parallel network power generation of the present invention and civil power direction of tide measurement mechanism.
Fig. 2 is the mounting structure of A, B, C three-phase circuit in a kind of parallel network power generation of the present invention and the civil power direction of tide measurement mechanism.
Fig. 3 is the synoptic diagram of A circuitry phase in a kind of parallel network power generation of the present invention and the civil power direction of tide measurement mechanism.
Fig. 4 is the synoptic diagram of single-chip microcomputer in a kind of parallel network power generation of the present invention and the civil power direction of tide measurement mechanism.
Fig. 5 is a kind of parallel network power generation of the present invention and civil power direction of tide measuring method current sampling process flow diagram in the specific implementation.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
The present invention includes mutual inductor TA0, the TA1, TB0, TB1, TC0, the TC1 that are located in the three-phase circuit, and single-chip microcomputer 40, as depicted in figs. 1 and 2, three-phase circuit is divided into A, B, C three-phase, be 120 ° of installations between this A, B, the C three-phase circuit, its outside is for connecting the grid-connected side 100 that is incorporated into the power networks, and is inboard for connecting the civil power side 200 of civil power; For being connected the load-side 50 with electric loading, in the A circuitry phase, the side that is incorporated into the power networks 100 is connected with load-side 50 by mutual inductor TA0 between the side that is incorporated into the power networks 100 and the civil power side 200, and civil power side 200 is passed through mutual inductor TA1 and is connected with load-side;
Be provided with mutual inductor TB0, TB1 on the B circuitry phase, wherein TB0 is used for obtaining between the two size of current and direction being incorporated into the power networks between side and the load-side on the B circuitry phase; TB1 is used for obtaining between the two size of current and direction between the load-side on the B circuitry phase and civil power side simultaneously.
Be provided with mutual inductor TC0, TC1 on the C circuitry phase, wherein TC0 is used for obtaining between the two size of current and direction being incorporated into the power networks between side and the load-side on the C circuitry phase; TC1 is used for obtaining between the two size of current and direction between the load-side on the C circuitry phase and civil power side simultaneously.
Above-mentioned mutual inductor all is the double winding mutual inductor, and two windings wherein are respectively applied to measure size of current and the direction that is incorporated into the power networks on every circuit between side and the load-side or are respectively applied to measure size of current and the direction between the civil power side and load-side on every circuitry phase.
As shown in Figure 3 and Figure 4, single-chip microcomputer 40 is provided with AD sample connection 41, it is connected with mutual inductor TA0, TA1, TB0, TB1, TC0 and the TC1 of A, B, C three-phase circuit respectively, current information on these mutual inductors is taken a sample (instantaneous size and instantaneous direction that current information comprises electric current) and is converted into digital signal, obtain 6 groups of current data, simultaneously carried out record the sample time of current information; 6 groups of current data that single-chip microcomputer obtains sampling and storing sample time.Single-chip microcomputer compares obtaining two groups of data on every circuit simultaneously, and judges the direction of tide of electrical network according to comparing result.
At last, single-chip microcomputer 40 can be stored 6 groups of current data and the corresponding sample time of sampling, generates chart and shows by display device, checks to make things convenient for the staff.
It is as follows to get the process that auto levelizer measures parallel network power generation and civil power direction of tide based on such scheme:
1) with load-side 50 amongs a pair of winding current transformer TA0, TB0, TC0 are installed in each side 100 that is incorporated into the power networks that goes up mutually of three-phase circuit according to such scheme, to detect current.
2) respectively fill a pair of winding current transformer TA1, TB1, TC1 according to such scheme in peace between each civil power side 200 of going up mutually of three-phase circuit and the load-side 50, with the detection current.
3) TA0 on the three-phase circuit, TA1, TB0, TB1, TC0, TC1 are connected with the AD sample connection of single-chip microcomputer 40 respectively, current information on these mutual inductors is immediately taken a sample and is converted into the digital signal of being convenient to post-processed, obtain 6 groups of current data, and record corresponding sample time.This step implementation following (referring to Fig. 5):
(31) single-chip microcomputer 40 two double windings of taking a sample first on every circuitry phase in be incorporated into the power networks mutual inductor TA0, TB0 between side and the load-side, TC0 are responded to the current information (comprising size of current and direction) that obtains;
(32) single-chip microcomputer 40 is removed the invalid turbulent flow in the current information that obtains of taking a sample in (31), is converted into digital signal, and these digital signals and corresponding sample time are stored;
(33) on the every circuitry phase of single-chip microcomputer 40 sampling among mutual inductor TA1, the TB1 between civil power side and load-side, the TC1 two double windings respond to the current information that obtains;
(34) single-chip microcomputer 40 is removed the invalid turbulent flow in the current information that obtains of taking a sample in (33), is converted into digital signal, and these digital signals and corresponding sample time are stored;
4) upper obtained one group of current information and compare and judge same sample time on every circuit; Comparing when judging, if the direction of current that the mutual inductor between grid-connected side and load-side obtains on every circuit is forward, judging that then load this moment is by side 100 power supplies of being incorporated into the power networks; If the direction of current that the mutual inductor on every circuit between civil power side and load-side obtains is forward, judge that then the load of this moment is by 200 power supplies of civil power side.5) single-chip microcomputer generates form with 6 groups of current data and corresponding sample time, demonstrates the current direction by display device; Form is as follows:
The present invention can realize that immediately monitoring is grid-connected and monitor move towards with the current of electric loading with civil power, make things convenient for staff's intuitive judgment to put sometime, with the transmission of electricity trend of electric loading from the time come from grid-connected or mains-supplied, and can arrive intuitively the data such as power consumption, the operation and the judgement that have made things convenient for the staff to be correlated with effectively promote work efficiency, reduce simultaneously the wrong incidence of operation, reduce potential potential safety hazard, had higher practicality.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (8)
1. a parallel network power generation and civil power direction of tide measurement mechanism, it is located on the three-phase circuit, and described three-phase circuit is respectively A phase, B phase and C mutually, is Y-connection between this A, B, the C three-phase circuit and angle differs 120 °, it is characterized in that:
The described three-phase circuit outside is for connecting the grid-connected side that is incorporated into the power networks, and is inboard for connecting the civil power side of utility grid, civil power side and the load-side for being connected with load between the side that is incorporated into the power networks;
Be provided with first, second mutual inductor of measuring size of current and direction on described every circuitry phase, described the first mutual inductor is incorporated into the power networks between side and the load-side this circuitry phase, and the second mutual inductor is between the civil power side and load-side of this circuitry phase;
Described measurement mechanism also comprises a single-chip microcomputer, which is provided with sample connection, respectively with three-phase circuit on mutual inductor interconnect, be used for current information, the sample time of sample connection sampling being calculated and judging current trend, generated output.
2. a kind of parallel network power generation as claimed in claim 1 and civil power direction of tide measurement mechanism is characterized in that, described first, second mutual inductor is the double-winding current mutual inductor, and double winding wherein is respectively applied to the size and Orientation of sampling current.
3. a kind of parallel network power generation as claimed in claim 1 and civil power direction of tide measurement mechanism, it is characterized in that, described single-chip microcomputer is provided with a digital-to-analogue conversion module and a memory module, described digital-to-analogue conversion module is used for the current information of sampling is converted into digital signal, described memory module is used for digital signal, the sample time of current information are stored as data, generates chart and pass through a display device to show.
4. a kind of parallel network power generation as claimed in claim 1 and civil power direction of tide measurement mechanism is characterized in that described single-chip microcomputer comprises a filtering module, and it is used for the invalid turbulent filtering with the electric current of sampling.
5. a parallel network power generation and civil power direction of tide measuring method is characterized in that the method comprises the steps:
1) between grid-connected and load, civil power and load, mutual inductor is set;
2) current information on the mutual inductor between grid-connected side and load-side, civil power side and the load-side on the three-phase circuit is taken a sample, the time of this current instantaneous value of simultaneously record sampling, wherein, described current information comprises the size and Orientation of electric current;
The current information of the mutual inductor sampling on the current information of 3) mutual inductor between grid-connected side and the load-side on every circuitry phase being taken a sample and this circuitry phase between civil power side and the load-side compares, and judges that accordingly the load electricity consumption is from parallel network power generation or mains-supplied.
6. a kind of parallel network power generation as claimed in claim 5 and civil power direction of tide measuring method is characterized in that, if the current information of taking a sample on the mutual inductor between described grid-connected side and the load-side is forward, judge that then load is by grid-connected power supply; If the current instantaneous value of taking a sample is forward, judge that then load passes through mains-supplied on the mutual inductor between described civil power side and the load-side.
7. a kind of parallel network power generation as claimed in claim 5 and civil power direction of tide measuring method, it is characterized in that, described measuring method is stored in judgement complete rear current instantaneous value and the sample time that each current transformer is taken a sample, and generates chart and pass through a display device to show.
8. a kind of parallel network power generation as claimed in claim 5 and civil power direction of tide measuring method is characterized in that, before the current instantaneous value to sampling calculates, judges, first invalid turbulent flow are carried out filtering.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105921687A CN103076522A (en) | 2012-12-29 | 2012-12-29 | Device and method for measuring tide directions of photovoltaic grid-connected power generation and commercial power |
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| CN2012105921687A CN103076522A (en) | 2012-12-29 | 2012-12-29 | Device and method for measuring tide directions of photovoltaic grid-connected power generation and commercial power |
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Application publication date: 20130501 |