CN201886067U - Online voltage harmonic monitoring system for wind farms - Google Patents
Online voltage harmonic monitoring system for wind farms Download PDFInfo
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- CN201886067U CN201886067U CN2010206327813U CN201020632781U CN201886067U CN 201886067 U CN201886067 U CN 201886067U CN 2010206327813 U CN2010206327813 U CN 2010206327813U CN 201020632781 U CN201020632781 U CN 201020632781U CN 201886067 U CN201886067 U CN 201886067U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 15
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- 238000004891 communication Methods 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
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- CVOFKRWYWCSDMA-UHFFFAOYSA-N 2-chloro-n-(2,6-diethylphenyl)-n-(methoxymethyl)acetamide;2,6-dinitro-n,n-dipropyl-4-(trifluoromethyl)aniline Chemical compound CCC1=CC=CC(CC)=C1N(COC)C(=O)CCl.CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O CVOFKRWYWCSDMA-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to an online voltage harmonic monitoring system for wind farms, which is simple in structure, fine in shielding effect and convenient in use. The online voltage harmonic monitoring system comprises a voltage division sampling device, an output end of the voltage division sampling device is connected with a signal conditioning circuit, an output end of the signal conditioning circuit is connected with a data acquisition control system, and the data acquisition control system is connected with a wireless transceiving circuit.
Description
Technical field
The utility model relates to a kind of wind energy turbine set voltage harmonic on-line monitoring system.
Background technology
When at present wind energy turbine set inserts high-voltage electric power system to and the measurement of the quality of power supply of site be that wind farm grid-connected detection must content measurement, the measurement of the quality of power supply comprises variation in voltage, flickering and harmonic wave test.When adopting the wind-powered electricity generation unit of charged power electronic converter in the wind energy turbine set, genset can produce a large amount of harmonic waves, if directly inject electrical network, can cause the rapid rising of harmonic content in the electrical network and the decline of the quality of power supply, so power department requires wind-powered electricity generation field energy accurately measuring so that the harmonic wave that injects electric system is limited in real time harmonic wave.
The present both at home and abroad harmonic wave tester of existing many manufacturer production, but these instruments have general characteristics: (1) is multi-functional, high-performance, high price; (2) laboratory or use out of doors is fit to scientific research, electrical network is patrolled and examined or temporary detecting; (3) the independent special test equipment that uses, personal management and use; (4) with capacitance type potential transformer (CVT) as change in voltage device extraction voltage signal.Yet, because the popularity of electrical network and the ubiquity of harmonic wave, and there is very big error by the secondary side signal that the CVT changeable device obtains, above instrument is difficult to satisfy the accurate Testing requirement of harmonic wave.
The utility model content
The purpose of this utility model provides a kind of wind energy turbine set voltage harmonic on-line monitoring system exactly for addressing the above problem, and it is simple in structure, and shield effectiveness is good, and is easy to use.
For achieving the above object, the utility model adopts following technical scheme:
A kind of wind energy turbine set voltage harmonic on-line monitoring system, it comprises the dividing potential drop sampling equipment, the output terminal of dividing potential drop sampling equipment is connected with signal conditioning circuit, and the signal conditioning circuit output terminal is connected with data acquisition control system, and data acquisition control system is connected with wireless transceiver circuit.
Described dividing potential drop sampling equipment is a capacitive divider, and it comprises dividing potential drop electric capacity, the capacitance of bushing of series connection, and capacitance of bushing connects high-voltage electric power system through current transformer, dividing potential drop electric capacity one end ground connection, and other end output signal is to signal conditioning circuit.
A described dividing potential drop electric capacity switch also in parallel.
Described dividing potential drop electric capacity output terminal also is connected with holding circuit.
Described data acquisition control system comprises isolation sensor, and the output signal of its received signal conditioning circuit is sent signal into dsp chip behind dc bias circuit, A/D alternating current sampling circuit, and dsp chip is the TMS320SF2812 type; It is connected with wireless transceiver circuit by communication interface.
The TMS320SF2812 DSP that the utility model is produced with American TI Company is the data acquisition control system and the incorporate embedded harmonic wave detecting instrument of test dividing potential drop sampling equipment of analytical calculation core.
Wind energy turbine set voltage harmonic real-time monitoring system comprises dividing potential drop sampling equipment and DSP data acquisition control system.Ground connection after it adopts an accurate dividing potential drop sampling equipment stable, that loss is little, power is big, capacity is bigger to connect with the shell of high-tension line CT sleeve pipe, draw the voltage signal of measuring on the electric capacity, under the control of DSP Data Acquisition and Conversion System (DACS), voltage signal is carried out calculation process, draw line voltage effective value, voltage resultant distortion rate and the each harmonic content of required measurement.
Wherein, the dividing potential drop sample devices is based on the ultimate principle of capacitive divider (CVT), utilize wind energy turbine set transformer station current transformer (CT) winding High-Voltage Insulation electric capacity (capacitance of bushing) as the capacitive divider high-voltage capacitance, insert dividing potential drop electric capacity as measurement electric capacity, thereby constitute condenser divider at its earth terminal (abbreviation CT end screen) polyphone.Measure voltage signal from measuring the electric capacity two ends, behind signal condition, insert digital electrical network filtering detector, promptly obtain reliable harmonic wave test data.For this reason, adopted harmonic wave test dividing potential drop sampling equipment, this equipment is measured the inaccurate problem of harmonic voltage by solving CVT well with CT sleeve shell capacitance series.Characteristic according to capacitance partial pressure, voltage on the capacitance partial pressure electric capacity should be linearly proportional with the voltage on the high-tension line, and the size of this ratio equates substantially that with the inverse ratio of two electric capacity the voltage signal that records on the dividing potential drop electric capacity outputs to the DSP data acquisition control system through signal conditioning circuit.
The DSP data acquisition control system, by sensor and dc bias circuit the voltage signal that the dividing potential drop sample devices obtains is carried out processing such as filtering amplification, realize the discretize of voltage signal through the A/D conversion, the time domain discrete signal of sampling is done fft analysis handle, can obtain effective value, voltage resultant distortion rate and the each harmonic content of wind farm grid-connected point voltage.
Voltage signal is directly drawn from the low dividing potential drop electric capacity of dividing potential drop sampling equipment, the size of signal is approximately 20V～30V, through isolation sensor voltage signal is adjusted into about 1V, carrying out processing such as filtering amplification through dc bias circuit, deliver to the A/D port of TMS320SF2812 then, under the control of dsp system, realize the discrete sampling of signal,, draw required measurement data in utilization FFT calculation process.
Because this system requirements is realized real-time monitoring and data recording to the point voltage that is incorporated into the power networks, system has also expanded clock circuit and data-carrier store.Clock circuit is mainly used in the data integral point statistics and day statistics of monitor, also provides corresponding time keeping for measurement data simultaneously; Storer mainly is to historical data (integral point data, day statistical number, out-of-limit Wave data etc.) storage.
For realizing and the wireless data transmission of PC, also designed in the system based on the communication interface of MAX232 chip and the wireless transmit/receive units of low-power consumption, realize the double-direction radio data transmission, transmitting-receiving frequency is 433MHz, communication distance is not less than 15 meters.
The dividing potential drop sampling equipment is used in wind farm grid-connected point; electric system herein is the high-pressure system of 220KV or 500KV electric pressure; accident occurring can cause the accident; must select safest circuit arrangement and safeguard measure; and linearity and frequency characteristic that can not the shadow harmonic measuring device, after experiment repeatedly, adopted the multiple protective device; on circuit design, adopted safe and reliable circuit.When board design, between signal and the ground wire, leave nearer can be when high voltage discharging gap, on circuit connects, can adopt the mode of multichannel multipoint earthing, guarantee safe and reliable ground connection.The DSP data acquisition control system has been developed supporting wireless control system, can non-contacting instrument be controlled.
The beneficial effects of the utility model are:
L real-time online detection of grid voltage can be realized remote monitoring by radio communication
The easy handling safety of 2 measurements is directly perceived, reliable
3 uniline harmonic waves test dividing potential drop sampling equipment places in the wall-hanging control cabinet, and shield effectiveness is good, and is easy to use.
Description of drawings
Fig. 1 is a system construction drawing of the present utility model;
Fig. 2 is the data acquisition control system structural drawing.
Wherein, 1 high-voltage electric power system, winding of 2 current transformers; 3 capacitance of bushings, 4 dividing potential drop electric capacity, 5 holding circuits; 6 signal conditioning circuits; 7 data acquisition control systems, 8 wireless transceiver circuits, 9 isolation sensors; 10 dc bias circuits; 11 A/D alternating current sampling circuits, 12DSP chip, 13 communication interfaces.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Among Fig. 1; it comprises the dividing potential drop sampling equipment; the dividing potential drop sampling equipment is a capacitive divider 4; it comprises dividing potential drop electric capacity 4, the capacitance of bushing 3 of series connection; capacitance of bushing 3 connects high-voltage electric power system 1 through winding 2 of current transformer; dividing potential drop electric capacity 4 one end ground connection, other end branch output signal arrives signal conditioning circuit 6, should also be connected with holding circuit 5 by end simultaneously.Dividing potential drop electric capacity 4 switch also in parallel.
Data acquisition control system 7 comprises isolation sensor 9, and the output signal of its received signal conditioning circuit 6 is sent signal into dsp chip 12 behind dc bias circuit 10, A/D alternating current sampling circuit 11, and dsp chip 12 is the TMS320SF2812 type; It is connected with wireless transceiver circuit 8 by communication interface 13.
Claims (5)
1. wind energy turbine set voltage harmonic on-line monitoring system, it is characterized in that it comprises the dividing potential drop sampling equipment, the output terminal of dividing potential drop sampling equipment is connected with signal conditioning circuit, the signal conditioning circuit output terminal is connected with data acquisition control system, and data acquisition control system is connected with wireless transceiver circuit.
2. wind energy turbine set voltage harmonic on-line monitoring system as claimed in claim 1, it is characterized in that, described dividing potential drop sampling equipment is a capacitive divider, it comprises dividing potential drop electric capacity, the capacitance of bushing of series connection, capacitance of bushing connects high-voltage electric power system through current transformer, dividing potential drop electric capacity one end ground connection, other end output signal is to signal conditioning circuit.
3. wind energy turbine set voltage harmonic on-line monitoring system as claimed in claim 2 is characterized in that, a described dividing potential drop electric capacity switch also in parallel.
4. wind energy turbine set voltage harmonic on-line monitoring system as claimed in claim 2 is characterized in that, described dividing potential drop electric capacity output terminal also is connected with holding circuit.
5. wind energy turbine set voltage harmonic on-line monitoring system as claimed in claim 1, it is characterized in that, described data acquisition control system comprises isolation sensor, the output signal of its received signal conditioning circuit, behind dc bias circuit, A/D alternating current sampling circuit signal is sent into dsp chip, dsp chip is the TMS320SF2812 type; It is connected with wireless transceiver circuit by communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206327813U CN201886067U (en) | 2010-11-30 | 2010-11-30 | Online voltage harmonic monitoring system for wind farms |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206327813U CN201886067U (en) | 2010-11-30 | 2010-11-30 | Online voltage harmonic monitoring system for wind farms |
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| Publication Number | Publication Date |
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| CN201886067U true CN201886067U (en) | 2011-06-29 |
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| CN2010206327813U Expired - Lifetime CN201886067U (en) | 2010-11-30 | 2010-11-30 | Online voltage harmonic monitoring system for wind farms |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364604A (en) * | 2013-07-30 | 2013-10-23 | 武汉大学 | Capacitor voltage transformer suitable for high-voltage harmonic measurement and measurement method |
| CN109085526A (en) * | 2018-07-20 | 2018-12-25 | 国网江苏省电力有限公司常州供电分公司 | Harmonic measuring method, apparatus and system based on capacitance type potential transformer |
| CN112269057A (en) * | 2020-09-21 | 2021-01-26 | 国网山东省电力公司齐河县供电公司 | Wind-powered electricity generation field harmonic detecting system |
| CN113030571A (en) * | 2021-03-30 | 2021-06-25 | 国网浙江省电力有限公司丽水供电公司 | Insulator type power transmission line harmonic component monitoring device |
-
2010
- 2010-11-30 CN CN2010206327813U patent/CN201886067U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364604A (en) * | 2013-07-30 | 2013-10-23 | 武汉大学 | Capacitor voltage transformer suitable for high-voltage harmonic measurement and measurement method |
| CN103364604B (en) * | 2013-07-30 | 2016-06-29 | 武汉大学 | Capacitance type potential transformer and measuring method suitable in high-voltage harmonic measurement |
| CN109085526A (en) * | 2018-07-20 | 2018-12-25 | 国网江苏省电力有限公司常州供电分公司 | Harmonic measuring method, apparatus and system based on capacitance type potential transformer |
| CN112269057A (en) * | 2020-09-21 | 2021-01-26 | 国网山东省电力公司齐河县供电公司 | Wind-powered electricity generation field harmonic detecting system |
| CN113030571A (en) * | 2021-03-30 | 2021-06-25 | 国网浙江省电力有限公司丽水供电公司 | Insulator type power transmission line harmonic component monitoring device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE ELECTRIC NET CROP. Effective date: 20130312 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130312 Address after: 250002 Ji'nan City Central District, Shandong, No. 2 South Road, No. 500 Patentee after: Shandong Research Inst. of Electric Power Patentee after: State Grid Corporation of China Address before: 250002 Ji'nan City Central District, Shandong, No. 2 South Road, No. 500 Patentee before: Shandong Research Inst. of Electric Power |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110629 |