CN202840691U - Intelligent power quality monitoring and management system - Google Patents

Intelligent power quality monitoring and management system Download PDF

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Publication number
CN202840691U
CN202840691U CN2012205162263U CN201220516226U CN202840691U CN 202840691 U CN202840691 U CN 202840691U CN 2012205162263 U CN2012205162263 U CN 2012205162263U CN 201220516226 U CN201220516226 U CN 201220516226U CN 202840691 U CN202840691 U CN 202840691U
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CN
China
Prior art keywords
power
power quality
control unit
quality
governing
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CN2012205162263U
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Chinese (zh)
Inventor
张斌
张辰
魏红艳
贾晓红
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山西巨安电子技术有限公司
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Priority to CN2012205162263U priority Critical patent/CN202840691U/en
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Publication of CN202840691U publication Critical patent/CN202840691U/en

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    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The utility model relates to an intelligent power quality monitoring and management system which comprises an upper personal computer (PC). The upper PC is connected with a central access machine, an active power filter and a reactive power compensator. The central access machine is connected with a plurality of routers connected with a plurality of control units of direct digital control (DDC), and the control units of the DDC are connected with a data acquisition control unit. The upper PC comprises a micro-computer connected with a color monitor, a high-speed printer and an uninterrupted power supply (UPS). The intelligent power quality monitoring and management system has the advantages of achieving real-time monitoring of power quality parameters of harmonic content, flickering and disturbance of voltage, deviation of frequency, degree of unbalance, power factors and the like of a power grid system, performing power quality analysis and fault analysis, simultaneously managing a power quality problem appearing in a power grid, finally improving power quality of the power supplying of the power grid, prolonging service life of the device and ensuring safe operation of the power grid.

Description

A kind of Intelligent power quality monitoring and governing system

Technical field

The utility model relates to a kind of Intelligent power quality monitoring and governing system.

Background technology

The quality of power supply refers to supply with by utility network the alternating current quality of energy of user side.The utility network of perfect condition should be with constant frequency, standard sine wave and rated voltage to customer power supply.Simultaneously, in the three-phase alternating current system, the amplitude size of each phase voltage and electric current should equate, phase place symmetrical and differ 120 degree.But because the equipment such as generator, transformer and circuit in the system are non-linear or asymmetric, load character is changeable, in addition control measures imperfection and operation, external interference and various failure and other reasons, this perfect condition does not exist.Therefore, produced the operation of power networks power equipment and for the variety of issue in the electricity consumption link, also just produced the concept of the quality of power supply.

Before the reform and opening-up, China's industrial level is relatively backward, and manufacturing industry technique is more coarse, and the advanced manufacturing industry of high, precision and frontier aspect lacks especially, thereby, the impact that harmonic wave causes and harm and not obvious, and power quality problem is more carried less than agenda.People generally believe, as long as can guarantee the normal of mains frequency and guarantee supply power voltage within the specific limits, just equal to have guaranteed the quality of power supply of electrical network.In addition from the electric power system supply-demand relationship of China, be in plan and shortage economy period before the eighties, having and not having electricity is subject matter for the user, " quality of power supply " problem is not just known where to begin naturally.

Along with the development of national economy, the progress of science and technology and production process increasingly automated, various nonlinear-loads constantly increase in the electrical network; Various complexity, accurate, more and more to the power consumption equipment of quality of power supply sensitivity.Day by day universal, not only unusually responsive to the power supply quality of power supply based on control appliance and the electronic installations of computer system in a large number along with computer technology also aggravated simultaneously the further deterioration of the quality of power supply.

Because the amount that the quality of power supply need to be monitored is high distortion much and mostly, traditional method is to adopt the analysis of analog signal, monitors different power quality indexs and uses different instrument.Such as voltmeter, the ammeter of traditional measuring voltage and current effective value, measure meritorious table, the idle table of power loss, the frequency meter of measuring frequency also has harmonic meter, tri-phase unbalance factor meter, voltage fluctuation and flickermeter.The weak point of this quasi-instrument is that the index that can monitor is few, and versatility is poor, precision is lower, automaticity is lower.

Adopting microprocessor is that the new-generation digital formula instrument of core is widely used, and core is by DSP(Digital Signal Proceeding) consist of.Generally all can link to each other with computer, the PC+DSP primary and secondary structure that the composition data disposal ability is stronger has the functions such as demonstration, storage, communication, human-computer dialogue.A website is monitored, preferably effect is arranged.

The development trend of power quality monitoring device tends to adopt nonvolatil permanent plant that field data is carried out on-line monitoring at present, for the stationary electric quality monitoring device, needs considering cost and performance to carry out special development.Adopt embedded system and Digital Signal Processing to have in design on-line monitoring, intellectuality, networking, real-time is good and cost is low characteristics based on the Intelligentized electric energy quality on-line monitoring equipment of microprocessor.Embedded system based on two CPU combines DSP embedded processor and embedded microcontroller, by 2 CPU expanding system resources, and common sharing system load, DSP also is beneficial to the real-time of assurance system as the high speed processing device simultaneously.The high speed processing ability of this dual-CPU system structure and DSP realizes that for the assurance system power such as on-line monitoring, intellectuality, networking and don't sacrifice real-time have played key effect.It has the advantages that on-line monitoring, precision are high, the upgrading potentiality are large, real-time good, volume is little, cost is low, both has been applicable to on-the-spot Measurement and analysis, also is applicable to long-term on-line monitoring.

The modern power network scale is increasing, and the monitoring point is more and more, and the monitoring of the following quality of power supply not only is confined to certain a bit, but will realize the electric energy quality monitoring of same electric power system, different location, even realizes the concentrated monitoring of a plurality of different electric power systems.On function, more emphasize intellectuality, except having the functions such as calculating, demonstration, also the functions such as certain judgement, analysis, decision-making will be arranged, if carry out event prediction, fault identification, interference source identification and in real time control, tentatively has automatic practical advanced computational intelligence evaluation function.

Along with the development of science and technology, the improving constantly of commercial production levels and living standards of the people, non-linear electrical equipment puts into operation in electrical network in a large number, and the proportion that has caused the harmonic component of electrical network to account for is increasing.It has not only increased the current supply loss of electrical network, and disturbs the protective device of electrical network and the normal operation of automation equipment, has caused malfunction and the tripping of these devices, directly threatens the safe operation of electrical network.Illustrate, electronic energy-saving lamp moves in the less electrical network of use amount proportion, and the incandescent lamp than commonly used is good really, not only again power saving of brightness height, and also useful life is also long.But opposite, behind the electricity-saving lamp that puts into operation in a large number, will find that the spoilage of electricity-saving lamp improves greatly.This is because electricity-saving lamp is nonlinear-load, its has produced larger harmonic pollution this a slice electrical network, cause in the three-phase load situation in a basic balance, the center line electric current is high, and line voltage and phase voltage 1 much smaller frequently caused this sheet grid supply quality decline, the power consumption equipment heating increases, grid line loss increases, so that the distribution transforming heating that should distinguish is serious, has a strong impact on its useful life.Therefore, to the effective monitoring of the power consumption equipment quality of power supply, the power quality problem in the electrical network be can in time reflect, thereby effectively monitoring and comprehensive improvement realized.

New Generation of Intelligent electric energy quality monitoring and governing system thereof gather relevant quality of power supply information by front end high-precision intelligent harvester, and relevant information reached center access machine by network and router, carry out data analysis and process at this, and then be committed to host computer, send dependent instruction by host computer, and relevant abatement equipment sent control command, the power quality problem that exists in to electrical network on the basis of realizing effective monitoring is administered.

The utility model content

The purpose of this utility model provides the monitoring of a kind of Intelligent power quality and governing system, to overcome the simultaneously detection of grid that present prior art exists and the problem of when electrical network goes wrong electrical network being processed.

The purpose of this utility model is to be achieved through the following technical solutions:

A kind of Intelligent power quality monitoring and governing system, comprise host computer PC, described host computer PC is connected with center access machine, Active Power Filter-APF and reactive-load compensator, described center access machine is connected with some routers, router is connected with some control unit DDC, and control unit DDC is connected with the data acquisition control unit; Described host computer PC comprises microcomputer, and microcomputer is connected with colored watch-dog, high-speed printer and ups power; Described data acquisition control unit comprises transducer, and transducer is connected with analysis and processing module, and analysis and processing module is provided with display unit, and analysis and processing module is connected with data transmission module, and data transmission module is connected with described control unit DDC; Described Active Power Filter-APF comprises circuit breaker, circuit breaker is connected with control PCB, control PCB is connected with power supply PCB and inverter, inverter is connected with capacitor with reactor respectively, reactor is connected with the precharge contactor, the precharge contactor is parallel with pre-charge resistance, and pre-charge resistance is connected with reactor; Described control PCB comprises the harmonic separation circuit, and the harmonic separation circuit connects to be regulated and testing circuit, regulates to be connected drive circuit with testing circuit.

Further, described center access machine adopts serial ports RS232 to communicate by letter with host computer PC, and the center access adopts CAN to communicate by letter with router.

Further, described router adopts CAN to communicate by letter with control unit DDC.

The beneficial effects of the utility model are: the power quality parameters such as deviation, degree of unbalance and power factor of having realized the flickering of harmonic content, voltage of Real-Time Monitoring network system and disturbance, frequency, and carry out power quality analysis and accident analysis, simultaneously the power quality problem that occurs in the electrical network is in time administered, finally improved the quality of power supply of mains supply, prolonged the useful life of equipment, for the safe operation of electrical network provides safeguard.

Description of drawings

The below is described in further detail the utility model with reference to the accompanying drawings.

Fig. 1 is the described a kind of Intelligent power quality monitoring of the utility model embodiment and governing system structured flowchart;

Fig. 2 is the electrical schematic diagram of the Active Power Filter-APF of the described a kind of Intelligent power quality monitoring of the utility model embodiment and governing system;

Fig. 3 is the structural principle block diagram of the reactive-load compensator in the described a kind of Intelligent power quality monitoring of the utility model embodiment and the governing system.

Embodiment

As shown in Figure 1, the described a kind of Intelligent power quality monitoring of the utility model embodiment and governing system, comprise host computer PC, described host computer PC is connected with center access machine, Active Power Filter-APF and reactive-load compensator, described center access machine is connected with some routers, router is connected with some control unit DDC, and control unit DDC is connected with the data acquisition control unit; Described host computer PC comprises microcomputer, and microcomputer is connected with colored watch-dog, high-speed printer and ups power; Described data acquisition control unit comprises transducer, and transducer is connected with analysis and processing module, and analysis and processing module is provided with display unit, and analysis and processing module is connected with data transmission module, and data transmission module is connected with described control unit DDC;Described center access machine adopts serial ports RS232 to communicate by letter with host computer PC, and the center access adopts CAN to communicate by letter with router.Described router adopts CAN to communicate by letter with control unit DDC.

As shown in Figure 2, described Active Power Filter-APF comprises circuit breaker, circuit breaker is connected with control PCB, control PCB is connected with power supply PCB and inverter, inverter is connected with capacitor with reactor respectively, reactor is connected with the precharge contactor, and the precharge contactor is parallel with pre-charge resistance, and pre-charge resistance is connected with reactor; Described control PCB comprises the harmonic separation circuit, and the harmonic separation circuit is connected with to be regulated and testing circuit, and adjusting and testing circuit are connected with drive circuit.The basic principle of Active Power Filter-APF is (such as Fig. 2):

Behind the breaker closing, Active Power Filter-APF is at first by the capacitor charging of pre-charge resistance to the DC bus, and this process is to prevent from powering on rear moment impact to the DC bus capacitor.After busbar voltage Vdc reached rated value, the precharge contactor was closed.

Dc capacitor is outwards exported offset current by IGBT inverter and inner reactor energy is provided as energy-storage travelling wave tube.

Active Power Filter-APF gathers the harmonic separation module that current signal is delivered to control PCB by outside instrument transformer, and this module is delivered to adjusting and monitoring modular with the first-harmonic component separation with harmonic components.This module can compare system harmonics composition and the issued offset current of ACTSine that collects, obtain difference and output to drive circuit as the real-Time Compensation signal, trigger the IGBT inverter compensation harmonic electric current is injected in the electrical network, realize the function of filtering harmonic wave.

During concrete the use, described Active Power Filter-APF: the harmonic wave that exists is administered, eliminated the normal operation that affects equipment because harmonic wave is excessive.

As shown in Figure 3, described reactive-load compensator: according to the idle type in the electrical network, compensate artificially capacitive reactive power or the idle reactive power of offsetting in the circuit of perception, adopted based on dc capacitor voltage control and electric current loop FEEDBACK CONTROL, from the instantaneous meritorious angle of system, transmitting with quadergy, reactive current take the electric current that keeps dc capacitor voltage and send as system is as target, set up double closed-loop control system, outer shroud is the DC voltage control ring, and interior ring is the AC current control ring.Just accurately and rapidly dynamic passive compensation be can realize, thereby the line loss that reduces distribution line, the purpose of improving grid supply quality reached.

Described data acquisition control unit: operating electric current, voltage, harmonic content are gathered, provide the analysis foundation to the prosecution backstage.Data acquisition unit mainly is comprised of transducer, analysis and processing module, display unit, data transmission module 4 parts.Data acquisition unit can be monitored harmonic wave, variation in voltage and the flickering of three-phase voltage, three-phase current by transducer, power factor, and meritorious, idle, frequency modulation parameter, harmonic wave can be monitored 2-60 time.Analysis and processing module is take TMS320F2812 as core processor, adopting respectively institute to trigger A/D to frequency multiplier circuit and TMS320F2812 crowd's task manager when analyzing stable state harmonic wave and transient power quality problem fills and changes, by doing the stable state harmonic components in the FFT detection of grid, utilize wavelet transformation analysis transient power quality problem, and demonstrate the data of surveying by display unit, transfer data to simultaneously the order of control unit DDC formation control, by the reception of CAN interface and according to order these data are configured the control purpose that reaches relevant device.

Described host computer PC: whole system is monitored and controlled, send control command and configuration information to underlying device, and receive and process the data that lower floor uploads.

Described center access machine: router is uploaded information carry out classifying packing and be uploaded to the management level host computer PC.

Described router: be used for each point intelligent acquisition device transfer of data to management platform.

Described small current neutral grounding device: this device can be located the small current neutral grounding point in time, accurately, and in time the cooperating personnel solve the small current neutral grounding problem.

Intelligent power quality monitoring and governing system analysis software thereof: set up the historical data base confession to the data that harvester is adopted back, and the data analysis to gathering, quote conclusion and be presented on the server, and control Active Power Filter-APF and reactive-load compensator carry out power and compensation to electrical network.

The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but do any variation in its shape or structure; every have identical with a application or akin technical scheme, all drops within the protection range of the present utility model.

Claims (5)

1. an Intelligent power quality is monitored and governing system, comprise host computer PC, it is characterized in that: described host computer PC is connected with center access machine, Active Power Filter-APF and reactive-load compensator, described center access machine is connected with some routers, described router is connected with some control unit DDC, and control unit DDC is connected with the data acquisition control unit; Described data acquisition control unit comprises transducer, and transducer is connected with analysis and processing module, and analysis and processing module is provided with display unit, and analysis and processing module is connected with data transmission module, and data transmission module is connected with described control unit DDC; Described host computer PC comprises microcomputer, and microcomputer is connected with colored watch-dog, high-speed printer and ups power.
2. a kind of Intelligent power quality according to claim 1 is monitored and governing system, it is characterized in that: described center access machine adopts serial ports RS232 to communicate by letter with host computer PC, and access machine in center adopts CAN to communicate by letter with router.
3. a kind of Intelligent power quality according to claim 2 is monitored and governing system, it is characterized in that: described router adopts CAN to communicate by letter with control unit DDC.
4. a kind of Intelligent power quality according to claim 3 is monitored and governing system, it is characterized in that: described Active Power Filter-APF comprises circuit breaker, circuit breaker is connected with control PCB, control PCB is connected with power supply PCB and inverter, inverter is connected with capacitor with reactor respectively, reactor is connected with the precharge contactor, and the precharge contactor is parallel with pre-charge resistance, and pre-charge resistance is connected with reactor.
5. a kind of Intelligent power quality according to claim 4 is monitored and governing system, and it is characterized in that: described control PCB comprises the harmonic separation circuit, and the harmonic separation circuit connects to be regulated and testing circuit, regulates to be connected drive circuit with testing circuit.
CN2012205162263U 2012-10-10 2012-10-10 Intelligent power quality monitoring and management system CN202840691U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103595127A (en) * 2013-09-18 2014-02-19 中国海洋石油总公司 Intelligent control method and intelligent control system for offshore petroleum platform power grid
CN105990907A (en) * 2016-07-01 2016-10-05 广州华炜科技有限公司 Power quality intelligent safety monitoring system and monitoring method thereof
CN106645937A (en) * 2016-12-28 2017-05-10 珠海格力电器股份有限公司 Electric quantity metering management system and electric quantity metering method
CN106712026A (en) * 2017-04-06 2017-05-24 湖南行知聚能源科技发展有限公司 Harmonic monitoring and suppression system for large amount of nonlinear load users

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103595127A (en) * 2013-09-18 2014-02-19 中国海洋石油总公司 Intelligent control method and intelligent control system for offshore petroleum platform power grid
CN105990907A (en) * 2016-07-01 2016-10-05 广州华炜科技有限公司 Power quality intelligent safety monitoring system and monitoring method thereof
CN105990907B (en) * 2016-07-01 2019-02-05 广州华炜科技有限公司 A kind of power quality intelligent safety monitoring system and its monitoring method
CN106645937A (en) * 2016-12-28 2017-05-10 珠海格力电器股份有限公司 Electric quantity metering management system and electric quantity metering method
CN106645937B (en) * 2016-12-28 2019-04-16 珠海格力电器股份有限公司 Electric quantity metering management system and electric quantity metering method
CN106712026A (en) * 2017-04-06 2017-05-24 湖南行知聚能源科技发展有限公司 Harmonic monitoring and suppression system for large amount of nonlinear load users

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Granted publication date: 20130327

Termination date: 20181010