CN104333016A - Dispersing type reactive compensation system for low-voltage power distribution network - Google Patents
Dispersing type reactive compensation system for low-voltage power distribution network Download PDFInfo
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- CN104333016A CN104333016A CN201410665970.3A CN201410665970A CN104333016A CN 104333016 A CN104333016 A CN 104333016A CN 201410665970 A CN201410665970 A CN 201410665970A CN 104333016 A CN104333016 A CN 104333016A
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- low
- voltage
- reactive compensation
- supply line
- reactive
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a dispersing type reactive compensation system for a low-voltage power distribution network. The dispersing type reactive compensation system for the low-voltage power distribution network comprises a low-voltage power supply line which is connected with an output end of a public power distribution transformer and two reactive compensation devices; one reactive compensation device is connected with a front end of a middle section load center of the low-voltage power supply line; the other reactive compensation device is connected with a front end of a rear section load center of the low-voltage power supply line. The dispersing type reactive compensation system for the low-voltage power distribution network has the advantages of substantially improving the voltage gain effect of the reactive compensation devices and well avoiding superposition of the low-voltage line front section voltage due to the fact that the reactive compensation devices are directly installed before load centers at the middle section and the rear section of the low-voltage power supply line, meanwhile being high in control accuracy, low in power consumption, small in size and free of maintenance and particularly suitable for occasions that the power supply line diameter is large, the tail end is insufficient in reactive power or the voltage is low.
Description
Technical field
The present invention relates to control technique in power system.
Background technology
Ubiquity region, rural areas in our country is relatively vast and the situation that load aggregation extent is not high, and the supply district radius of a station power distribution transformer is even larger often beyond 500 meters.And, affect by the factor such as geographical environment, economic development, the stolen frequency of supply line is high and to be forced to use the problems such as aluminum conductor, running environment is severe commonplace, all there is utilization voltage situation on the low side in a lot of rural area, indivedual area voltage of registering one's residence even is low to moderate below 150V, and the basic living demand such as to throw light on, cook all cannot meet.
In the face of improve constantly life, productive power demand and management, service request, at present, power supply enterprise is in the modular design of newly-built public distribution transformer project, generally all can configure low-voltage reactive compensator capable according to the rated capacity of distribution transformer and be arranged on low-tension distribution box, exerted oneself by the idle of compensator transformer, improve power factor (PF), promote low-voltage circuit terminal voltage level.
But, there are two drawbacks in traditional low-voltage reactive compensator capable: one is the switching being realized Capacitor banks by control A.C. contactor or air switch, the deadly defect of this device is mechanical contact, easy generation impulse current, cause serious harm to circuit and compensation arrangement itself, failure rate is high; Two is low-voltage circuit front ends that compensation arrangement is arranged at public distribution transformer, compensating gain scope is very limited, and rural low voltage network generally disperses and overwhelming majority use aluminum conductor, for in platform district low-voltage circuit, back segment user, the gain of reactive power compensation to power factor (PF) and voltage disappears substantially, reactive power compensator performs practically no function, and parts of traditional reactive power compensator does not have automatic switching function, too raise low-voltage circuit front voltage even on the contrary, serious curtailment user power utilization equipment life.And, in order to compensate the larger voltage drop of aluminum conductor, meet the power quality of low-voltage circuit terminal temperature difference, power supply enterprise is often by the tap gear of adjustment distribution transformer, heighten output voltage, conventional reactive power compensator is once put into operation, and voltage gain will directly be superimposed upon on bus, cause leading portion user overtension, even burn out subscriber equipment.
Summary of the invention
The object of the invention is to propose a kind of low-voltage network decentralized reactive compensation system, it is little and easily burn out the technical problem of subscriber equipment that it can solve compensating gain scope.
In order to achieve the above object, the technical solution adopted in the present invention is as follows:
Low-voltage network decentralized reactive compensation system, it comprises the low-voltage supply line and two reactive power compensators that are connected with the output of public distribution transformer, one of them reactive power compensator is connected with the front end of the stage casing load center of described low-voltage supply line, and another reactive power compensator is connected with the front end of the back segment load center of described low-voltage supply line.
Preferably, this low-voltage network decentralized reactive compensation system also comprises power communication module, wireless communication module and background server, power communication model calling is at the leading portion of described low-voltage supply line, and power communication module is used for the data collected to send to background server by wireless communication module; Reactive power compensator is also connected with described wireless communication module.
Preferably, described wireless communication module is GPRS module.
Preferably, described reactive power compensator is low-voltage reactive compensator capable.
Preferably, described low-voltage supply line is aluminum conductor.
The present invention has following beneficial effect:
Before stage casing reactive power compensator being directly installed on low-voltage supply line and back segment load center, significantly can improve the voltage gain effect of reactive power compensator on the one hand, also the superposition to low-voltage circuit leading portion voltage has well been stopped on the other hand, have that control precision is high, low in energy consumption simultaneously, compact, the advantage such as non-maintaining, be especially applicable to being applied to supply line half path length, end reactive power be not enough or the occasion of low voltage.
Accompanying drawing explanation
Fig. 1 is the structural representation of the low-voltage network decentralized reactive compensation system of present pre-ferred embodiments.
Reference numeral: 1, public distribution transformer; 2, low-voltage supply line; 3, reactive power compensator; 4, reactive power compensator; 5, leading portion load; 6, stage casing load center; 7, back segment load center; 8, power communication module; 9, wireless communication module; 10, background server.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the present invention is described further.
As shown in Figure 1, a kind of low-voltage network decentralized reactive compensation system, it comprises the low-voltage supply line 2, reactive power compensator 3, reactive power compensator 4, power communication module 8, wireless communication module 9 and the background server 10 that are connected with the output of public distribution transformer 1.Reactive power compensator 3 is connected with the front end of the stage casing load center 6 of described low-voltage supply line 2, and reactive power compensator 4 is connected with the front end of the back segment load center 7 of described low-voltage supply line 2.Power communication module 8 is connected to the leading portion of described low-voltage supply line 2, before can being positioned at the leading portion load 5 (non-central) of low-voltage supply line 2, power communication module 8 is for sending to background server 10 by the data collected by wireless communication module 9.Reactive power compensator 3 and reactive power compensator 4 are also connected with described wireless communication module 9, and the data that reactive power compensator 3 and reactive power compensator 4 are also preserved respectively are crossed wireless communication module 9 and sent to background server 10.
The wireless communication module 9 of the present embodiment is GPRS module.Reactive power compensator 3 and reactive power compensator 4 are low-voltage reactive compensator capable.Low-voltage supply line 2 is aluminum conductor.
Reactive power compensator integral installation, at low-voltage supply line stage casing, rural area and back segment, specifically according to line load distribution and the difference of load character, configures the reactive power compensator of suitable capacity, before being arranged on low-voltage circuit load center.
In low voltage electric network running, the analog signal input module of reactive power compensator gathers the parameters such as line current, voltage, power factor (PF), submit to its CPU and memory module carries out computational analysis, first the voltage of circuit is judged, ensure the switching not carrying out capacitor under overvoltage or undervoltage condition; Then judge power factor of electric network, analyze the reactive power of electrical network reality, and this power factor is compared with set point; Last with nine-zone graph control principle for foundation, decision is three-phase switching or phase-splitting switching simultaneously, and the size of switching capacity, realizes low-voltage circuit distributing dynamic passive compensation.The data simultaneously current system run in conjunction with its clock module and state and time write data storage.The data of operations staff by power communication module and reactive power compensator send, upload to background server by wireless communication module by history and service data, to carry out overall data analysis and operational management.
The present embodiment proposes the insurmountable voltage circuit front end overcompensation of conventional reactive power compensator or overtension and the solution of the problem of tail end line brownout, propose through engineering approaches scheme and possessed volume production condition, have that control precision is high, low in energy consumption, compact, the advantage such as non-maintaining, be applicable to being applied to circuit half path length, end reactive power is not enough or the occasion of low voltage, can distributed compensation on the spot be realized, really avoid the front end centralized compensation of prior art, drawback that overcompensation causes.
Concrete, the particular hardware configuration design of the present embodiment can be as follows:
Reactive power compensator adopts the Intelligent Reactive Compensating Controller based on 16bi tPIC18F458 single-chip microcomputer, adopts three phase dynamic compensation, single-phase dynamic compensation and mixed compensation various ways, has the advantages such as high-performance, low cost, reliable in quality, flexible configuration.
Reactive compensation system generally works in strong alternating current magnetic field environment, and the switch misoperation caused for preventing interference signal, system must have stronger antijamming capability.Therefore, the data processing section of controller selects antijamming capability and the strong PIC18F4520 single-chip microcomputer of computing capability, and input end signal adopts the linear coupling device of two optical coupling to isolate.Meanwhile, for ensureing the precision of variable and the parameter data provided, prime sampling instrument transformer adopts precision to be the instrument transformer of 5%, and the LM134 series that amplifier adopts distortion less, A/D conversion portion adopts AD7656.In addition, system selects 20MHz crystal oscillator, and clock chip adopts DS1302 (crystal oscillator 32.768kHz), and display display employing 12864 Liquid Crystal Module, is driven by ST7920.System in working order under power consumption be no more than 5W.
1, the hardware designs of system:
Native system carries out reactive power compensation mainly for the three-phase alternating current system of 380V, 50Hz, and its main functional modules comprises analog signal input module, CPU and memory module, real-time clock module, communication module and human-computer interaction module.
(1) analog signal input module
Analog signal input module comprises the parameters such as electric current and voltage formation, low-pass filtering and reference voltage formation, its effect is that voltage, the current-mode analog quantity exported by voltage transformer summation current transformer secondary to be processed into through above-mentioned link that size is directly proportional to input variable, the distortionless analog quantity of phase place, and through the sampling of A/D change-over circuit and conversion, be translated into the digital quantity that computer can receive and identify, then carry out data processing and calculating.
(2) CPU and memory module
Employing CPU and memory module are the cores of hardware device system.CPU adopts the PIC18F4520 of Harvard dual-bus structure, and its speed of service fast (instruction cycle 160 ~ 200ns), can make the access of program storage and the access parallel processing of data storage; Meanwhile, it adopts instruction flow line line structure, and memory module is in order to record every phase voltage, electric current, active power, reactive power and power factor, and the switching time switching frequency etc. of capacitor.In addition, system also extends ferroelectric memory FM3164, for preserving operational factor.
(3) real-time clock module
In order to can real-time display system time and realize the function that the temporally date preserves the data collected, system extension a slice walks abreast real-time clock/calendar chip DS1302, the real-time clock of construction system, clock circuit DS1302 is trickle charge clock chip, include a real-time clock and 31B static RAM (SRAM), communicated with single-chip microcomputer by simple serial line interface.Serial communication between DS1302 and single-chip microcomputer only needs 3 mouth line: RES (reset); #I/O (data wire); SCLK (serial clock).In the present system, the Main Function of clock circuit is the data and state and time write data storage run by current system, for the transmission of historical data in telecommunication, and provides foundation for the analysis of electric power system, scheduling and management.
(4) communication module (there is communication function)
Usually need in the control of reactive power compensating to carry out Long-distance Control switching to field controller, read in real time, historical data and reception failure alarm signal etc., therefore, communication function is one of prerequisite function of controller.Communication module is the bridge of transfer of data between main control computer and field controller, and the electrical network parameter that controller obtains on the one hand can be sent to background server in real time by GPRS network; On the other hand, the data that host computer server transmits reactive power compensator terminal and warning message process, and manage the historical data of each terminal, assign various transmission, control command, realize two-way data command transmission.Therefore, communication module is main man-machine interface.Native system is communicated by RS-232/485 serial communication, is mainly used in carrying out storing the output of data and the calibration etc. of system time in the transfer of data of operation of power networks parameter and system mode, memory.In addition, PIC18F4520, with USB device controller, facilitates staff to arrive scene at any time and reads and parameter the data of controller, arrange communication interface circuit.
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection range of the claims in the present invention.
Claims (5)
1. low-voltage network decentralized reactive compensation system, it is characterized in that, comprise the low-voltage supply line and two reactive power compensators that are connected with the output of public distribution transformer, one of them reactive power compensator is connected with the front end of the stage casing load center of described low-voltage supply line, and another reactive power compensator is connected with the front end of the back segment load center of described low-voltage supply line.
2. low-voltage network decentralized reactive compensation system as claimed in claim 1, it is characterized in that, also comprise power communication module, wireless communication module and background server, power communication model calling is at the leading portion of described low-voltage supply line, and power communication module is used for the data collected to send to background server by wireless communication module; Reactive power compensator is also connected with described wireless communication module.
3. low-voltage network decentralized reactive compensation system as claimed in claim 2, it is characterized in that, described wireless communication module is GPRS module.
4. low-voltage network decentralized reactive compensation system as claimed in claim 1, it is characterized in that, described reactive power compensator is low-voltage reactive compensator capable.
5. low-voltage network decentralized reactive compensation system as claimed in claim 1, it is characterized in that, described low-voltage supply line is aluminum conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410665970.3A CN104333016A (en) | 2014-11-19 | 2014-11-19 | Dispersing type reactive compensation system for low-voltage power distribution network |
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| CN201410665970.3A CN104333016A (en) | 2014-11-19 | 2014-11-19 | Dispersing type reactive compensation system for low-voltage power distribution network |
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| CN104333016A true CN104333016A (en) | 2015-02-04 |
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| CN201410665970.3A Pending CN104333016A (en) | 2014-11-19 | 2014-11-19 | Dispersing type reactive compensation system for low-voltage power distribution network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610169A (en) * | 2016-03-15 | 2016-05-25 | 河南隆鑫电力设备有限公司 | Low-voltage power distribution network voltage control system and method |
| CN110739697A (en) * | 2019-10-21 | 2020-01-31 | 广州供电局有限公司 | Low-voltage distribution network low-voltage treatment device and treatment method |
| CN113644662A (en) * | 2021-08-16 | 2021-11-12 | 普泰克电力有限公司 | Low-voltage lifting method for rural power grid tail end |
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| CN102377187A (en) * | 2011-10-19 | 2012-03-14 | 镇江博扬电气科技有限公司 | Reactive compensation system on remote monitoring post |
| JP2013031362A (en) * | 2011-06-23 | 2013-02-07 | Central Research Institute Of Electric Power Industry | User voltage stabilization system in power distribution system |
| CN203415986U (en) * | 2013-06-17 | 2014-01-29 | 国家电网公司 | Disperse reactive compensation system of low voltage power distribution station area based on wireless network |
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2014
- 2014-11-19 CN CN201410665970.3A patent/CN104333016A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013031362A (en) * | 2011-06-23 | 2013-02-07 | Central Research Institute Of Electric Power Industry | User voltage stabilization system in power distribution system |
| CN102377187A (en) * | 2011-10-19 | 2012-03-14 | 镇江博扬电气科技有限公司 | Reactive compensation system on remote monitoring post |
| CN203415986U (en) * | 2013-06-17 | 2014-01-29 | 国家电网公司 | Disperse reactive compensation system of low voltage power distribution station area based on wireless network |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610169A (en) * | 2016-03-15 | 2016-05-25 | 河南隆鑫电力设备有限公司 | Low-voltage power distribution network voltage control system and method |
| CN105610169B (en) * | 2016-03-15 | 2018-08-14 | 河南隆鑫电力设备有限公司 | A kind of low-voltage network voltage control system and method |
| CN110739697A (en) * | 2019-10-21 | 2020-01-31 | 广州供电局有限公司 | Low-voltage distribution network low-voltage treatment device and treatment method |
| CN110739697B (en) * | 2019-10-21 | 2021-08-10 | 广东电网有限责任公司广州供电局 | Low-voltage distribution network low-voltage treatment device and treatment method |
| CN113644662A (en) * | 2021-08-16 | 2021-11-12 | 普泰克电力有限公司 | Low-voltage lifting method for rural power grid tail end |
| CN113644662B (en) * | 2021-08-16 | 2024-06-25 | 普泰克电力有限公司 | Low-voltage lifting method for rural power grid end |
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Application publication date: 20150204 |