CN201417946Y - Double-tuned high-pass filter for inhibiting coupling of AC lines to adjacent DC lines - Google Patents
Double-tuned high-pass filter for inhibiting coupling of AC lines to adjacent DC lines Download PDFInfo
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- CN201417946Y CN201417946Y CN2009200277042U CN200920027704U CN201417946Y CN 201417946 Y CN201417946 Y CN 201417946Y CN 2009200277042 U CN2009200277042 U CN 2009200277042U CN 200920027704 U CN200920027704 U CN 200920027704U CN 201417946 Y CN201417946 Y CN 201417946Y
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Abstract
The utility model discloses a double-tuned high-pass filter for inhibiting the electromagnetic coupling of AC lines to adjacent DC lines. The double-tuned high-pass filter reduces the power frequencycurrent component of the AC lines coupling entering a converter transformer on the DC lines, simultaneously filters second harmonics and other high-frequency components caused by triggering the angular modulation, and reduces the bad influences brought by triggering the angular modulation. The structure is that the filter comprises a charge-discharge resistance R, a capacitor C1, a series resistance R1, an inductance winding L1 and a zinc oxide lightning arrester ZnO, the series resistance R1 and the inductance winding L1 and the zinc oxide lightning arrester ZnO are connected in parallel, andthe parallel connection end is sequentially and serially connected with a resistance R2, an inductance winding L2 and a capacitor C2.
Description
Technical field
The utility model relates to a kind of inhibition alternating current circuit to adjacent DC line electricity magnetic coupling double tunning high pass filter.
Background technology
Because remote large capacity transmission and electric power system are internet interconnected, the land resource that can be used for erecting power transmission lines is tending towards saturated, and alternating current-direct current sets up with the corridor and becomes general.Ac and dc circuit with the corridor operation down, the alternating current circuit can produce the line-frequency induction electric current by electromagnetic coupled in contiguous DC line, this electric current enters the two ends current conversion station by DC line, invade converter transformer, can form DC component and produce harmonic wave in the Transformer Winding electric current, can make the magnetization curve of transformer core produce skew under the serious situation, form D.C. magnetic biasing.This will make noise of transformer, loss increase, and damage transformer, reduce its useful life.The coupling mechanism of in-depth AC proposes more efficiently braking measure, has great importance.
Suppress the measure of ac and dc circuit electromagnetic coupling effect, currently mainly contain following 4 points: 1. alternating current circuit transposition in the coupled section; 2. DC line transposition in the coupled section; 3. the installing of DC bus is tuned to the LC wave arrestment filter of power frequency; 4. trigger angle modulation.Wherein, though first method can reduce the DC component in the converter transformer electric current largely, the ultra-high-tension power transmission line transposition is loaded down with trivial details, and particularly extra high voltage line is difficult in actual engineering realize that economic performance is relatively poor simultaneously; Be different from the transposition of alternating current circuit, second method only changed in essence ac and dc circuit in the transposition section near distance, it is little for the electromagnetic coupled influence that reduces ac and dc circuit; The effect of the third method is between between first kind and the second method, but can not meet the demands fully in some actual engineerings, may bring some problems such as overvoltage simultaneously; The 4th kind of method is the trigger angle modulation, technical and economic performance is good, but also can bring some negative effects, as increase exchanges and the uncharacteristic harmonics content of DC side etc., this method only be suitable for the less and change of current of alternating current component in the DC line become in DC component situation hour.Except that above-mentioned, also can be by increasing coupling distance between ac and dc circuit, reducing in coupling length, the coupled section alternating current circuit lead and get delta arrangement, overhead ground wire and adopt methods such as continuous ground to suppress coupling effect, but be subject to the composite request of actual transmission line design, the engineering construction relative difficult, economic performance is poor simultaneously.
In sum, electromagnetic coupled braking measure effect is not too desirable between present existing ac and dc circuit, particularly at ac and dc circuit electric pressure height, line pitch weak point, the long situation of coupling length, must carry out necessary improvement and design.
The utility model content
The purpose of this utility model is to overcome the deficiency of above-mentioned trigger angle modulation technique, a kind of high-frequency harmonic content that can effectively reduce on the DC line is provided, and the inhibition alternating current circuit that the direct-current component of while converter transformer can be effectively controlled is to DC line electromagnetic coupled double tunning high pass filter.
For achieving the above object, the utility model adopts following technical scheme:
A kind of inhibition alternating current circuit is to adjacent DC line electricity magnetic coupling double tunning high pass filter, and it comprises and discharges and recharges resistance R, capacitor C
1, the series connection resistance R
1With the inductance winding L
1And zinc oxide arrester ZnO parallel connection; Its end in parallel is series resistor R successively
2, the inductance winding L
2And capacitor C
2
The utility model adopts the double tunning high pass filter to reduce to enter on the DC line line-frequency induction electric current of converter transformer, alleviate the pressure of trigger angle modulation control, filter out second harmonic and other high fdrequency component of producing because of the trigger angle modulation simultaneously, reduce the harmful effect that the trigger angle modulation brings.Cardinal principle is as follows:
Existing trigger angle modulation control method can produce certain harmonic wave, wherein based on second harmonic, also has some high order harmonic components, and when electromagnetic coupled between ac and dc circuit was very serious, harmonic effects can be very outstanding.Simultaneously, the trigger angle of corresponding each valve can depart from valve to preset trigger angle far, bring the safety and stability problem of system, for example cause commutation failure etc. at the inversion side.This utility model is by installing the double tunning high pass filter to reduce this influence at neutral line place.The tuned frequency of this double tunning high pass filter is respectively work frequency and second harmonic frequency.Its role is to: at first reduce the power current component that flows into converter transformer, to reduce the pressure of trigger angle modulation control; Next is to suppress secondary and other high order harmonic component that the trigger angle modulation produces.
Advantage of the present utility model is to be easy to realize, can be at ac and dc circuit electric pressure height, line pitch is short, coupling length is long characteristic, be used between ac and dc circuit electromagnetic coupled than serious situation.The trigger angle control of this method correspondence is simple, good economy performance, and the double tunning high pass filter is simple in structure, and is safe and reliable to operation.Use this method, the high-frequency harmonic content on the DC line is few, and the direct-current component of converter transformer can be effectively controlled simultaneously.
Description of drawings
Fig. 1 is a double tunning high pass filter structure chart.
Specific implementation method
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
A kind of double tunning high pass filter, it comprises and discharges and recharges resistance R, capacitor C
1, the series connection resistance R
1With the inductance winding L
1And zinc oxide arrester ZnO parallel connection; Its end in parallel is series resistor R successively
2, the inductance winding L
2And capacitor C
2
Adopt the double tunning high pass filter, it is installed on DC line place, be connected between the neutral line and the ground.This Filter Structures as shown in Figure 1.Wherein R is for discharging and recharging resistance, R
1, R
2Be the corresponding inductance winding L of difference
1, L
2Resistance, C
1, C
2, L
1, L
2Be respectively electric capacity and inductance, ZnO is a zinc oxide arrester, so that equipment such as capacitor are protected.
Claims (1)
1. one kind is suppressed the alternating current circuit to adjacent DC line electricity magnetic coupling double tunning high pass filter, it is characterized in that, it comprises and discharges and recharges resistance R, capacitor C
1, the series connection resistance R
1With the inductance winding L
1And zinc oxide arrester ZnO parallel connection; Its end in parallel is series resistor R successively
2, the inductance winding L
2And capacitor C
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200277042U CN201417946Y (en) | 2009-06-18 | 2009-06-18 | Double-tuned high-pass filter for inhibiting coupling of AC lines to adjacent DC lines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200277042U CN201417946Y (en) | 2009-06-18 | 2009-06-18 | Double-tuned high-pass filter for inhibiting coupling of AC lines to adjacent DC lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201417946Y true CN201417946Y (en) | 2010-03-03 |
Family
ID=41794375
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200277042U Expired - Fee Related CN201417946Y (en) | 2009-06-18 | 2009-06-18 | Double-tuned high-pass filter for inhibiting coupling of AC lines to adjacent DC lines |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201417946Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257587A (en) * | 2013-03-29 | 2013-08-21 | 国家电网公司 | Filter switching control simulation device |
| CN106487019A (en) * | 2016-12-16 | 2017-03-08 | 董嵩华 | A kind of second order high-order harmonic filtering unit |
| CN106712018A (en) * | 2016-12-16 | 2017-05-24 | 董嵩华 | Higher harmonic filtering device based on balanced harmonic wave absorption and elimination |
| CN106896272A (en) * | 2017-02-07 | 2017-06-27 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Suppress the circuit and measuring method of line-frequency induction voltage when transmission line parameter is measured |
| CN107167663A (en) * | 2017-03-30 | 2017-09-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of measurement in a closed series circuit and measuring method for being used to suppress line-frequency induction voltage |
-
2009
- 2009-06-18 CN CN2009200277042U patent/CN201417946Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103257587A (en) * | 2013-03-29 | 2013-08-21 | 国家电网公司 | Filter switching control simulation device |
| CN103257587B (en) * | 2013-03-29 | 2015-12-16 | 国家电网公司 | A kind of wave filter switching control imitation device |
| CN106487019A (en) * | 2016-12-16 | 2017-03-08 | 董嵩华 | A kind of second order high-order harmonic filtering unit |
| CN106712018A (en) * | 2016-12-16 | 2017-05-24 | 董嵩华 | Higher harmonic filtering device based on balanced harmonic wave absorption and elimination |
| CN106896272A (en) * | 2017-02-07 | 2017-06-27 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Suppress the circuit and measuring method of line-frequency induction voltage when transmission line parameter is measured |
| CN107167663A (en) * | 2017-03-30 | 2017-09-15 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | A kind of measurement in a closed series circuit and measuring method for being used to suppress line-frequency induction voltage |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100303 Termination date: 20100618 |