CN103257289A - Single CPU power quality detecting and two-way power metering combination system - Google Patents
Single CPU power quality detecting and two-way power metering combination system Download PDFInfo
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Abstract
Disclosed is a single CPU power quality detecting and two-way power metering combination system. The functions of power quality detecting and power metering are integrated. Power quality parameters to be detected comprise most parameter lists demanded in power system standards. Three-phase voltage of a power system to be detected is directly input to the detecting system, current is input to the detecting system after passing through a Hall sensor or a mutual inductor, and the power quality parameters and power metering values obtained, on one hand, can be displayed through a local liquid crystal display module, and on the other hand, are output through an asynchronous serial bus. The detecting system can be applied to new energy distributed power generating systems like photovoltaic power generating systems and wind-driven power generating systems conveniently to conduct multi-node power quality detecting, and at the same time, can conduct two-way power metering to power consumption and power generation. The detecting system can also be applied to a modern power system to conduct power quality on-site detecting or remote monitoring, and at the same time, conduct power consumption metering. The single CPU power quality detecting and two-way power metering combination system has the advantages of being simple in structure, good in stability, strong in real-time performance and flexible and convenient to use.
Description
Technical field
The present invention relates to method and a kind of electric power monitoring system of a kind of Power Quality Detection and two-way electric energy metrical, especially, relate to the online detection of the integrated quality of power supply of a kind of single CPU and method and the electric integrated watch-dog of two-way electric energy metrical.
Background technology
Along with expanding economy, the sharp contradiction of energy shortage and environmental pollution becomes the problem that each country of the whole world all faces.In numerous novel energies, sun power and wind energy etc. have cleanliness without any pollution, safe and reliable, restriction less, the advantages such as inexhaustible not to the utmost, sustainable use used, thereby have incomparable advantage.Distributed power generation (Distributed Generation, DG) be a kind of novel efficient and generation mode flexibly, the access in DG source does not change original distribution net work structure, can effectively improve the power supply reliability of big electrical network, improve efficient and the quality of power supply of existing electric system, mitigation system constraint and minimizing transmission of electricity cost.New forms of energy such as photovoltaic, wind energy adopt distributed power generation utilize mode to provide for the large-scale promotion of photovoltaic wind energy and application can practical pattern.Yet generations of electricity by new energy such as photovoltaic, wind energy have the characteristics of the randomness, intermittence and the schedulability difference that are different from conventional power supply, and it is incorporated into the power networks the quality of power supply of electrical network and safety and stability are constituted certain threat.And photovoltaic generation and wind-power electricity generation use a large amount of power electronic devices, adopt technology such as modern inversion, rectification to realize being incorporated into the power networks of photovoltaic, wind-force electric energy, and the intrinsic technical characteristic of power electronic devices makes the new forms of energy electric energy comprise abundant harmonic wave; The use of electronic power inversion commutation technique has simultaneously reduced the inertia of photovoltaic wind generator system, causes power quality problems such as voltage fluctuation, frequency shakiness.On the other hand, feeder line trend complex distribution in the distributed generation system, feed connection node is more, and under the ideal state, the quality of power supply of feed connection node needs online real-time detection in each net.Want complicated many by the distributed system more traditional thermal power generation of its electric energy metrical field of being incorporated into the power networks, except the common node place that is incorporated into the power networks with civil power needs the two-way electric energy metrical, each distributed power source and distributed terminator also need electric energy metrical in its system.In sum, because the characteristic that photovoltaic, wind-force new forms of energy are intrinsic and the characteristic of Power Electronic Technique, the distributed grid-connected system of modern new forms of energy need detect the quality of power supply of each feed connection node in the distributed system, and simultaneously the electric energy of each feed connection node is carried out bidirectional measuring, distributed online Power Quality Detection system and distributed electric energy bidirectional measuring system are the indispensable checkout equipments of modern power systems, also are prerequisite and the guarantee of new forms of energy large-scale promotion application simultaneously.
Yet existing detection scheme great majority can only use instruments such as digital oscilloscope or portable electric energy quality monitor to carry out in-site measurement.These instrument assay intervals times are long, and the one-time detection data sampling time is short, can only obtain the unilateral power quality data of test period, can't realize online real-time long-time detection.On the other hand, two-way electric energy metrical can only adopt two-way ammeter to monitor, and can not merge with Power Quality Detection, uses inconvenient.
Summary of the invention
In order to overcome the shortcoming of existing electric energy detection scheme incompatibility distributed generation system, the invention provides a kind of single CPU Power Quality Detection and electric energy bidirectional measuring system ensemble, satisfy in modern electric electric power system and the distributed new electricity generation system demand to the online detection of the quality of power supply of distributed node and electric energy bidirectional measuring.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of single CPU Power Quality Detection and electric energy metrical system ensemble comprise CPU main control unit, three-phase voltage input channel module, three-phase current input channel module, information analysis unit, power module, data and command channel module, keyboard load module, LCD MODULE and drive software; Wherein three-phase voltage input channel module, three-phase current input channel module link to each other with the information analysis unit; The information analysis unit links to each other with the CPU main control unit by synchronous serial bus; Data link to each other with the CPU main control unit by synchronous serial bus with the command channel module; Data output channel module is by asynchronous serial bus output data or receive external command; The keyboard load module links to each other with main control unit by I/O port address bus; LCD MODULE links to each other with the CPU main control unit by synchronous serial bus; The input end of power module links to each other with three-phase voltage input channel module, and output terminal and system ensemble power lead are connected to the system ensemble power supply, as shown in Figure 1; The CPU main control unit adopts the single-chip microcomputer of low-power consumption high-performance reduced instruction set computer (RISC) CPU; Three-phase voltage input channel module directly inserts the high-voltage signal to be measured of three-phase and four-line, range is 0～1000 volt, gather voltage signal and input to the information analysis unit by accurate sampling resistor array, the while is with the sampling rate digital collection voltage signal of 18K; Three-phase current input channel module receives the current signal of Hall current sensor output, the current signal of simultaneously compatible current transformer output, through gathering current signal after the filtering adjustment and inputing to the information analysis unit, with the sampling rate digital collection current signal of 18K, range is 0～100 ampere simultaneously.
Data and command channel module adopt the asynchronous serial bus to export resulting power quality parameter and electric energy metrical numerical value, receive outer setting command simultaneously, be used for arranging the condition of work of this system ensemble, comprise open cease and desist order, parameters such as sampling time resolution, harmonic wave order; These data and command channel module adopt the compatible RS485 bus protocol of asynchronous serial bus interface and controller local area network (CAN) bus protocol; The keyboard of keyboard load module adopts main control unit I/O mouth to form the input of 5 keys, is respectively increase, reduces, moves to left, moves to right and confirms button; LCD MODULE adopts the liquid crystal blue screen of 128 * 64 dot matrix, the current detection value that is used for display part power quality parameter or electric energy metrical numerical value, simultaneously can be used for arranging the condition of work of this system ensemble, mainly comprise open cease and desist order, parameters such as sampling time resolution, harmonic wave order.
The power module of integrated test system adopts directly power supply and two kinds of power supplies of reserve battery; Directly power supply power taking from survey electric power object through powering for system ensemble on the one hand behind the rectifying and voltage-stabilizing, is charged in the mode of floating charge for reserve battery on the other hand; When direct power supply occurs interrupting or the institute's electric power object of surveying inconvenience power taking the time, has reserve battery directly to provide direct current supply for system ensemble; The system that is used for the drive software of integrated test system detects, realizes functions such as man-machine interaction, realization telecommunication, mainly comprises function of initializing module, human interface function's module, communication and command analysis functional module, data sampling and true value computing function module, data structure and protocol code module etc.
The function of Power Quality Detection and electric energy metrical has been merged in the present invention, the power quality parameter that detects comprise three-phase voltage effective value, three-phase current effective value, three-phase frequency, three-phase voltage current peak, three-phase voltage fluctuation, three-phase meritorious idle applied power, power factor, the parameters of electric power of first-harmonic, the parameters of electric power of harmonic wave; The parameters of electric power of first-harmonic and harmonic wave comprises: three-phase voltage effective value, three-phase current effective value, three-phase meritorious idle applied power, power factor, harmonic voltage aberration rate (THD), harmonic current aberration rate (THD) etc.
Technical conceive of the present invention is: single-chip microcomputer and information analysis unit with low-power consumption high-performance reduced instruction set computer (RISC) CPU are core, with three-phase voltage and the current signal into system that samples, under the control of CPU and external command, obtain the real time data of the quality of power supply, carry out electric quantity metering simultaneously.System comprises CPU main control unit, three-phase voltage input channel module, three-phase current input channel module, information analysis unit, power module, data and command channel module, keyboard load module, LCD MODULE and drive software composition.Wherein three-phase voltage input channel module, three-phase current input channel module link to each other with the information analysis unit; The information analysis unit links to each other with the CPU main control unit by synchronous serial bus; Data link to each other with the CPU main control unit by synchronous serial bus with the command channel module; Data output channel module is by asynchronous serial bus output data or receive external command; The keyboard load module links to each other with main control unit by I/O port address bus; LCD MODULE links to each other with the CPU main control unit by synchronous serial bus; The input end of power module links to each other with three-phase voltage input channel module, and output terminal and system ensemble power lead are connected to the system ensemble power supply.
Three-phase voltage input channel module directly inserts the high-voltage signal to be measured of phase three-wire three or three-phase and four-line, and range is 0～1000 volt, gathers voltage signal and inputs to the information analysis unit with the sampling rate of 18K by accurate sampling resistor array; Obtain current signal by Hall current sensor or current transformer, gather current signal and input to the information analysis unit with the sampling rate of 18K after the adjustment of excess current input channel module filtered, range is 0～100 ampere; Power quality parameter and electric energy metrical numerical value that the command channel module adopts the output of asynchronous serial bus to detect, receive outer setting command simultaneously, be used for arranging the condition of work of this system ensemble, mainly comprise open cease and desist order, parameters such as sampling time resolution, harmonic wave order; Data and command channel module adopt the compatible RS485 bus protocol of asynchronous serial bus interface and controller local area network (CAN) bus protocol; Keyboard in the keyboard load module adopts main control unit I/O mouth to form the input of 5 keys, is respectively increase, reduces, moves to left, moves to right and confirms button; LCD MODULE adopts the liquid crystal blue screen of 128 * 64 dot matrix, the numerical value that is used for display part quality of power supply current detection value or electric energy metrical, be used for arranging the condition of work of this system ensemble simultaneously, mainly comprise open cease and desist order, parameters such as sampling time resolution, harmonic wave order; Power module adopts directly power supply and two kinds of power supplies of reserve battery; Directly power supply power taking from survey electric power object through powering for system ensemble on the one hand behind the rectifying and voltage-stabilizing, is charged in the mode of floating charge for reserve battery on the other hand; When direct power supply occurs interrupting or the institute's electric power object of surveying inconvenience power taking the time, has reserve battery directly to provide direct current supply for system ensemble; Drive software is used for driving functions such as this system ensemble, realization man-machine interaction, realization telecommunication; With further, mainly comprise function of initializing module, human interface function's module, communication and command analysis functional module, data sampling and true value computing function module, data structure and protocol code module etc.
Beneficial effect of the present invention mainly shows:
1) the online detection of the integrated quality of power supply of a kind of single CPU and method and the electric integrated watch-dog of two-way electric energy metrical have been realized, merged the function of power analysis and ammeter metering, easy to use, reduced the cost that detects, and the quality of power supply that can detect is abundant, comprise be phase voltage effective value, three-phase current effective value, three-phase frequency, three-phase voltage current peak, three-phase voltage fluctuation, three-phase meritorious idle applied power, power factor, the parameters of electric power of first-harmonic, the parameters of electric power of harmonic wave; The parameters of electric power of first-harmonic and harmonic wave comprises: three-phase voltage effective value, three-phase current effective value, three-phase meritorious idle applied power, power factor, harmonic voltage aberration rate (THD), harmonic current aberration rate (THD) etc.;
2) this system ensemble has realized that the real-time online of the quality of power supply detects and electric energy metrical, has the temporal resolution height, and real-time characteristics are conducive to the safe operation of electric system, improve the reliability of electric system;
Adopted asynchronous serial bus communication when 3) this system ensemble possesses local man-machine interaction, the compatible RS485 of communication protocol and controller local area network (CAN) bus protocol can be realized on-the-spot the detection and remote real time monitoring, and use-pattern is flexible;
4) adopted the framework of single CPU multitask, simple in structure, cost is low, is convenient to realize large-scale monitoring network, thereby for the safe and reliable operation of distributed new electricity generation system provides guarantee, and then promote popularizing fast and extensive utilization of new forms of energy.
Description of drawings
Fig. 1 is the modular structure figure of system of the present invention;
Fig. 2 is drive software functional module structure figure of the present invention;
Fig. 3 is drive software process flow diagram of the present invention;
Embodiment
By reference to the accompanying drawings embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
With reference to Fig. 1～Fig. 3, a kind of single CPU Power Quality Detection and electric energy metrical system ensemble, be used for the Power Quality Detection of certain a plurality of node of distributed photovoltaic microgrid system and carry out two-way electric energy metrical simultaneously, adopt this comprehensive detection metering system as terminal device, adopt industrial computer as PC control, terminal device connects by controller local area network (CAN) bus.
The quality of power supply that detects comprise three-phase voltage effective value, three-phase current effective value, three-phase frequency, three-phase voltage current peak, three-phase voltage fluctuation, three-phase meritorious idle applied power, power factor, the parameters of electric power of first-harmonic, the parameters of electric power of harmonic wave; The parameters of electric power of first-harmonic and harmonic wave comprises: three-phase voltage effective value, three-phase current effective value, three-phase meritorious idle applied power, power factor, harmonic voltage aberration rate (THD), harmonic current aberration rate (THD) etc.
The terminal of this detection system comprises CPU main control unit, three-phase voltage input channel module, three-phase current input channel module, information analysis unit, power module, data and command channel module, keyboard load module, LCD MODULE and drive software composition.Wherein three-phase voltage input channel module, three-phase current input channel module link to each other with the information analysis unit; The information analysis unit links to each other with the CPU main control unit by synchronous serial bus; Data link to each other with the CPU main control unit by synchronous serial bus with the command channel module; Data output channel module is by asynchronous serial bus output data or receive external command; The keyboard load module links to each other with main control unit by I/O port address bus; LCD MODULE links to each other with the CPU main control unit by synchronous serial bus; The input end of power module links to each other with three-phase voltage input channel module, and output terminal and system ensemble power lead are connected to the system ensemble power supply, as shown in Figure 1.
The CPU main control unit of this terminal system adopts the single-chip microcomputer of low-power consumption high-performance reduced instruction set computer (RISC) CPU of 24 MicroChip companies.The three-phase voltage input channel module of this terminal device directly inserts the high-voltage signal to be measured of three-phase four-wire system, and range is set at 0～1000 volt, gathers voltage signal and inputs to the information analysis unit with the sampling rate of 18K by accurate sampling resistor array; Adopt Hall current sensor to obtain three-phase current signal, current signal receives through the input channel module, and through gathering current signal and input to the information analysis unit with the sampling rate of 18K after the filtering adjustment, range is set at 0～100 ampere then.
The data of this terminal system and command channel module adopt controller local area network (CAN) the bus protocol output in the asynchronous serial bus as power quality parameter and the electric energy metrical numerical value that detects, receive the order that arranges of host computer simultaneously, be used for arranging the condition of work of this system ensemble, mainly comprise open cease and desist order, parameters such as sampling time resolution, harmonic wave order.
The keyboard load module of this terminal system adopts the I/O mouth of main control unit to form the input of 5 keys, is respectively increase, reduces, moves to left, moves to right and confirms button; LCD MODULE adopts the liquid crystal blue screen of 128 * 64 dot matrix, is used for showing quality of power supply current detection value or electric energy metrical numerical value.The comprehensive use of keyboard input and liquid crystal display is used for arranging the condition of work of this system ensemble, mainly comprise unlatching cease and desist order, parameters such as sampling time resolution, harmonic wave order;
The power module of this terminal system adopts directly power supply and two kinds of power supplies of reserve battery; Directly power supply power taking from survey electric power object through powering for system ensemble on the one hand behind the rectifying and voltage-stabilizing, is charged in the mode of floating charge for reserve battery on the other hand; When direct power supply occurs interrupting or the institute's electric power object of surveying inconvenience power taking the time, has reserve battery directly to provide direct current supply for system ensemble;
The drive software of this terminal system is used for realizing functions such as Data Detection, realization man-machine interaction, realization telecommunication; Mainly comprise function of initializing module, human interface function's module, communication and command analysis functional module, data sampling and true value computing function module, data structure and protocol code module etc.
Arrange or long-range setting by this locality, this terminal system is gathered the quality of power supply of distributed photovoltaic microgrid node and is carried out electric energy metrical simultaneously, and the data that detect are uploaded in the industrial computer by controller local area network (CAN) bus, are used for showing and storage.Terminal system can be carried out the change of duty by the man-machine interaction at scene, also can carry out long-range setting by industrial computer.This system carries out the bidirectional measuring of electric weight when having realized the Power Quality Detection of a plurality of nodes of distributed photovoltaic microgrid, for the stable operation of distributed photovoltaic microgrid provides guarantee, simultaneously this system have reliable and stable, convenient, flexible, cost is low, characteristics such as real-time.
It should be noted that above what enumerate only is a specific embodiment of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (7)
1. a single CPU Power Quality Detection and two-way electric energy metrical system ensemble is characterized in that: comprise CPU main control unit, three-phase voltage input channel module, three-phase current input channel module, information analysis unit, power module, data and command channel module, keyboard load module, LCD MODULE and drive software.Wherein three-phase voltage input channel module, three-phase current input channel module link to each other with the information analysis unit; The information analysis unit links to each other with the CPU main control unit by synchronous serial bus; Data link to each other with the CPU main control unit by synchronous serial bus with the command channel module; Data and command channel module are by asynchronous serial bus output data or receive external command; The keyboard load module links to each other with main control unit by I/O port address bus; LCD MODULE links to each other with the CPU main control unit by synchronous serial bus; The input end of power module links to each other with three-phase voltage input channel module, and output terminal and this system ensemble power lead are connected to the system ensemble power supply.
2. the system as claimed in claim 1 is characterized in that: the single-chip microcomputer of described CPU main control unit employing low-power consumption high-performance reduced instruction set computer (RISC) CPU.
3. the system as claimed in claim 1, it is characterized in that: described three-phase voltage input channel module directly inserts the high-voltage signal to be measured of three-phase and four-line or phase three-wire three, range is 0～1000 volt, gathers voltage signal by accurate sampling resistor array and inputs to the information analysis unit and carry out digitized sampling with the sampling rate of 18K; Described three-phase current input channel module receives the current signal of Hall current sensor output, the current signal of simultaneously compatible current transformer output, through inputing to the information analysis unit after the filtering adjustment and with the sampling rate digital collection current signal of 18K, range is 0～100 ampere.
4. the system as claimed in claim 1, it is characterized in that: described data and command channel module adopt asynchronous serial bus output power quality parameter and electric energy metrical numerical value, simultaneously can also receive outer setting command, be used for the long-range condition of work that this system ensemble is set, mainly comprise open cease and desist order, parameters such as sampling time resolution, harmonic wave order; Further, described data and command channel module adopt the compatible RS485 bus protocol of asynchronous serial bus interface and controller local area network (CAN) bus protocol.
5. the system as claimed in claim 1 is characterized in that: the keyboard of described keyboard load module adopts CPU main control unit I/O mouth to form the input of 5 keys, is respectively increase, reduces, moves to left, moves to right and confirms button; Described LCD MODULE adopts the liquid crystal blue screen of 128 * 64 dot matrix, is used for the current detection value of display part power quality parameter or electric energy metrical; The comprehensive use of keyboard load module and LCD MODULE can be used for the condition of work that this locality arranges this system ensemble, comprise open cease and desist order, parameters such as sampling time resolution, harmonic wave order.
6. the system as claimed in claim 1 is characterized in that: the direct power supply of described power module employing and two kinds of power supplies of reserve battery; Directly power supply power taking from detection electric power object, through dividing two-way output behind the rectifying and voltage-stabilizing, the one tunnel is the system ensemble power supply, another road is that reserve battery charges in the mode of floating charge; When direct power supply occurs interrupting or the institute's electric power object of surveying inconvenience power taking the time, directly provides direct current supply for system ensemble by reserve battery.
7. the system as claimed in claim 1 is characterized in that drive software mainly comprises function of initializing module, human interface function's module, communication and command analysis functional module, data sampling and true value computing function module, data structure and protocol code functional module etc.
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| CN103475247A (en) * | 2013-09-18 | 2013-12-25 | 江苏省电力公司常州供电公司 | Active and reactive dispatchable control device of distributed photovoltaic power station |
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| CN104459387A (en) * | 2014-11-25 | 2015-03-25 | 浙江工业大学 | Movable handheld type electric energy quality parameter routing inspection system |
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| CN111971566A (en) * | 2018-01-12 | 2020-11-20 | 新加坡能源创新发展有限公司 | Improved electronic metering system |
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Application publication date: 20130821 |