CN104638890A - Harmonic filtering device and method for filtering high-frequency shaft current - Google Patents

Harmonic filtering device and method for filtering high-frequency shaft current Download PDF

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Publication number
CN104638890A
CN104638890A CN201510047685.XA CN201510047685A CN104638890A CN 104638890 A CN104638890 A CN 104638890A CN 201510047685 A CN201510047685 A CN 201510047685A CN 104638890 A CN104638890 A CN 104638890A
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China
Prior art keywords
harmonic
shaft
filtering
synchronous generator
electric capacity
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Pending
Application number
CN201510047685.XA
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Chinese (zh)
Inventor
王宏华
王成亮
翟学锋
范立新
孙昊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Hohai University HHU
Jiangsu Fangtian Power Technology Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Hohai University HHU
Jiangsu Fangtian Power Technology Co Ltd
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Application filed by State Grid Corp of China SGCC, State Grid Jiangsu Electric Power Co Ltd, Hohai University HHU, Jiangsu Fangtian Power Technology Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201510047685.XA priority Critical patent/CN104638890A/en
Publication of CN104638890A publication Critical patent/CN104638890A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/123—Suppression of common mode voltage or current

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a harmonic filtering device, comprising a capacitor C, a resistor R and a passive harmonic filter; the capacitor C, the resistor R and the passive harmonic filter are in parallel connection; one end of a parallel circuit of the capacitor C, the resistor R and the passive harmonic filter is grounded, and the other end of the parallel circuit is connected with an exciting side of a rotation shaft of a synchronous generator; a driving side of the rotation shaft of the synchronous generator is grounded; the passive harmonic filter includes a plurality of branches in parallel connection; the i branch includes a switch Ki, the capacitor Ci and an inductor Li connected serially, wherein the i is a positive integer; and meanwhile, the invention further discloses a method for filtering a high-frequency shaft current by the harmonic filtering device. According to the device and the method disclosed by the invention, direct-current shaft voltage, low-frequency shaft voltage, and high-frequency shaft voltage generated by a static excitation system due to asymmetrical magnetic fluxes or other self structures of the synchronous generator can be filtered effectively; and furthermore, the high-frequency shaft current of the synchronous generator due to some harmonic of a common-mode voltage output by the static excitation system can be filtered selectively.

Description

A kind of method of harmonic filtering installation and filtering high frequency shaft current thereof
Technical field
The present invention relates to a kind of method of harmonic filtering installation and filtering high frequency shaft current thereof, belong to shaft voltage, shaft current prevention and control field that synchronous generator static excitation system produces.
Background technology
Generating set is in running, and the voltage that formed between generator shaft two ends, between rotating shaft and ground or bearing, is called shaft voltage.Too high shaft voltage can puncture the lubricating oil film between generator shaft and bearing and produce electric discharge phenomena; cause galvano-cautery phenomenon; the motor components such as infringement bearing; acceleration mechanical weares and teares; shorten electrical machinery life; even can cause compressor emergency shutdown time serious, jeopardize the stable operation of network system, cause heavy losses.Therefore, shaft voltage is one of the serious problems of restriction large synchronous generator (turbo generator, hydraulic generator) safety, reliability service.
Shaft voltage is abnormal mainly comes from its shaft current produced to the harm of generator.When shaft current density is very large, the associate components such as axle journal, bearing shell that shaft current is passed through will be burned; The electric arc that shaft current causes also can ablation parts of bearings make the oil ageing of bearing, accelerates the mechanical wear of bearing; Shaft current also can make the miscellaneous part of components of steam turbine, generator ' s cover, bearing and threaded shaft strongly magnetize, and produces one pole electromotive force at axle journal and impeller place, and the generation of aggravation shaft voltage, causes vicious circle.
Along with the extensive use of thyristor static excitation system in high-rating generator, the high-frequency shaft voltage impulse amplitude caused because of thyristor converter is often very high, it is a kind of sizable shaft voltage source, very large to oil film insulation harm, and high frequency shaft current can form certain interference by countershaft vibration measuring signal, affect vibration measuring precision, axle time serious, may be caused to shake signal virtual height, cause unit because the vibrational of wrong report axle is large chaser.Suppress static excitation high frequency shaft voltage and shaft current be improve the insulation control degree of depth, guarantee large synchronous generator group safety, reliability service in the urgent need to.
In order to ensure large synchronous generator group safety and reliability service, existing shaft voltage filter comprises resistance in parallel and electric capacity, and one end ground connection of resistance and Capacitance parallel connection circuit, the other end is connected with the rotating shaft excitation side of synchronous generator.The shaft voltage filter of this structure can significantly suppress shaft voltage, shaft current, but the high-frequency impulse shaft voltage caused when can not eliminate the rectifier change of current completely and shaft current, and can not filtering high-frequency harmonic electric current selectively, shaft current is still containing high frequency harmonic components.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method of harmonic filtering installation and filtering high frequency shaft current thereof.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of harmonic filtering installation, comprise electric capacity C, resistance R and passive harmonic filter, described electric capacity C, resistance R and passive harmonic filter are in parallel, one end ground connection of described electric capacity C, resistance R and passive harmonic filter parallel circuits, another termination synchronous generator rotating shaft excitation side, described synchronous generator rotating shaft driving side ground connection; Described passive harmonic filter comprises some branch roads in parallel, and i-th branch road comprises the K switch of series connection i, electric capacity C iand inductance L i, wherein i is positive integer.
The electric capacity C of described passive harmonic filter iand inductance L ivalue meets following equation
L i C i = 1 ( 2 π f n ) 2
Wherein, inductance L iunit be Henry, electric capacity C iunit be farad, f nfor the frequency of the high frequency shaft current component that common-mode voltage n-th subharmonic of wanted filtering causes, unit is hertz, f n=150n, n=2i+1.
Described electric capacity C, resistance R are connected with synchronous generator rotating shaft excitation side by rapid fuse with one end of passive harmonic filter parallel circuits.
Every bar branch road of described passive harmonic filter is also in series with rapid fuse.
Described resistance R value is 510 ohm.
Described electric capacity C value is 10 microfarads.
A method for harmonic filtering installation filtering high frequency shaft current, comprises the following steps,
Step one, when each branch switch of passive harmonic filter all disconnects, carries out record wave measurement to the shaft voltage of synchronous generator;
Step 2, carrying out FFT and auto-power spectrum analysis successively to measuring the shaft voltage obtained, finding common-mode voltage several times harmonic component;
Step 3, close the switch corresponding with harmonic component, and the high frequency shaft current component that the common-mode voltage several times harmonic wave given prominence to filtering causes is target, filtering corresponding high frequency shaft current component.
The beneficial effect that the present invention reaches: the present invention can not only the high frequency shaft voltage that produces of direct current shaft voltage, low frequency shaft voltage and static excitation system that effectively filtering waits unit self structure reason to cause because synchronous generator magnetic flux is asymmetric, simultaneously can the synchronous generator high frequency shaft current that causes of filtering static excitation system output common mode voltage subharmonic selectively.
Accompanying drawing explanation
Fig. 1 is the syndeton schematic diagram of the present invention, synchronous generator and static excitation system.
Fig. 2 is that three-phase full-controlled bridge rectifier exports exciting voltage.
Fig. 3 is three-phase full-controlled bridge rectifier output common mode voltage.
Fig. 4 is the rotating shaft drive-side shaft voltage of synchronous generator when adopting existing shaft voltage filter.
Fig. 5 is the rotating shaft excitation side shaft voltage of synchronous generator when adopting existing shaft voltage filter.
Fig. 6 is the time domain waveform of the rotating shaft shaft current of synchronous generator when adopting existing shaft voltage filter.
Fig. 7 is the FFT of the rotating shaft shaft current of synchronous generator when adopting existing shaft voltage filter.
Fig. 8 is the rotating shaft drive-side shaft voltage of synchronous generator when adopting harmonic filtering installation of the present invention, wherein the high frequency shaft current component that causes of filtering common mode voltage regulation 7 subharmonic of the present invention.
Fig. 9 is the rotating shaft excitation side shaft voltage of synchronous generator when adopting harmonic filtering installation of the present invention, wherein the high frequency shaft current component that causes of filtering common mode voltage regulation 7 subharmonic of the present invention.
Figure 10 is the time domain waveform of rotating shaft shaft current of synchronous generator when adopting harmonic filtering installation of the present invention, wherein the high frequency shaft current component that causes of filtering common mode voltage regulation 7 subharmonic of the present invention.
Figure 11 is the FFT of rotating shaft shaft current of synchronous generator when adopting harmonic filtering installation of the present invention, wherein the high frequency shaft current component that causes of filtering common mode voltage regulation 7 subharmonic of the present invention.
Figure 12 is the rotating shaft drive-side shaft voltage of synchronous generator when adopting harmonic filtering installation of the present invention, wherein the high frequency shaft current component that causes of filtering common mode voltage regulation 7,9 subharmonic of the present invention
Figure 13 is the rotating shaft excitation side shaft voltage of synchronous generator when adopting harmonic filtering installation of the present invention, wherein the high frequency shaft current component that causes of filtering common mode voltage regulation 7,9 subharmonic of the present invention
Figure 14 is the time domain waveform of rotating shaft shaft current of synchronous generator when adopting harmonic filtering installation of the present invention, wherein the high frequency shaft current component that causes of filtering common mode voltage regulation 7,9 subharmonic of the present invention.
Figure 15 is the FFT of rotating shaft shaft current of synchronous generator when adopting harmonic filtering installation of the present invention, wherein the high frequency shaft current component that causes of filtering common mode voltage regulation 7,9 subharmonic of the present invention
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1, for the syndeton schematic diagram of the present invention, synchronous generator and static excitation system, wherein harmonic filtering installation, comprise electric capacity C, resistance R and passive harmonic filter, electric capacity C, resistance R and passive harmonic filter are in parallel, one end ground connection of electric capacity C, resistance R and passive harmonic filter parallel circuits, another termination synchronous generator rotating shaft excitation side, synchronous generator rotating shaft driving side ground connection; Wherein resistance R value is 510 ohm, and electric capacity C value is 10 microfarads.
Above-mentioned passive harmonic filter comprises some branch roads in parallel, and i-th branch road comprises the K switch of series connection i, electric capacity C iand inductance L i, wherein i is positive integer, electric capacity C iand inductance L ivalue meets following equation
L i C i = 1 ( 2 π f n ) 2
Wherein, inductance L iunit be Henry, electric capacity C iunit be farad, f nfor the frequency of the high frequency shaft current component that common-mode voltage n-th subharmonic of wanted filtering causes, unit is hertz, f n=150n, n=2i+1.
In order to protect electric capacity on every bar branch road and inductance, every bar branch road of passive harmonic filter is in series with rapid fuse, in FIG the rapid fuse F of i-th branch road irepresent; In like manner in order to protect electric capacity C and resistance R, electric capacity C, resistance R are connected with synchronous generator rotating shaft excitation side by rapid fuse with one end of passive harmonic filter parallel circuits, and this rapid fuse F represents in FIG.
Static excitation system is formed primarily of three phase excitation transformer and three-phase full-controlled bridge rectifier, and static excitation system provides DC excitation for rotor field coil.
A method for harmonic filtering installation filtering high frequency shaft current, comprises the following steps,
When each branch switch of passive harmonic filter all disconnects, record wave measurement is carried out to the shaft voltage of synchronous generator;
Step 2, carrying out FFT and auto-power spectrum analysis successively to measuring the shaft voltage obtained, finding common-mode voltage several times harmonic component;
Step 3, the switch closing corresponding with harmonic component (namely meeting n=2i+1), the high frequency shaft current component that the common-mode voltage several times harmonic wave given prominence to filtering causes is target, filtering corresponding high frequency shaft current component.In order to further illustrate the present invention, analyzed by following examples
Harmonic filtering installation of the present invention is applied in certain 1000MW, 3000r/min turbo generator set of employing static excitation, under MATLAB environment, carry out simulation modeling and simulation analysis.
Fig. 2-Figure 15 is the simulation result of three-phase full-controlled bridge rectifier Trigger Angle when being set to 90 °.
Fig. 2 is that three-phase full-controlled bridge rectifier exports exciting voltage; Fig. 3 is three-phase full-controlled bridge rectifier output common mode voltage.
Fig. 4 is synchronous generator rotating shaft drive-side shaft voltage during employing existing shaft voltage filter (the shaft voltage filter namely mentioned in background technology, resistance value gets 510 ohm, and electric capacity gets 10 microfarads, and earth resistance is 0.1 ohm); Fig. 5 is synchronous generator rotating shaft excitation side shaft voltage during employing existing shaft voltage filter; Fig. 6 is the time domain waveform of the rotating shaft shaft current of synchronous generator when adopting existing shaft voltage filter; Fig. 7 is the FFT of the rotating shaft shaft current of synchronous generator when adopting existing shaft voltage filter.
Fig. 8-Figure 11 is the simulation result of the high frequency shaft current component adopting harmonic filtering installation filtering common mode voltage regulation 7 subharmonic of the present invention to cause; N=7, corresponding branch road is the 3rd article of branch road, by the K switch of the 3rd article of branch road 3closed, the inductance L of passive harmonic filter 3with electric capacity C 3value meets
L 3 C 3 = 1 ( 2 π × 150 × 7 ) 2 = 1 ( 2 π × 1050 ) 2
Wherein Fig. 8 is synchronous generator rotating shaft drive-side shaft voltage during employing harmonic filtering installation of the present invention (wherein, resistance R value is 510 ohm, and electric capacity C value is 10 microfarads, and earth resistance is 0.1 ohm); Fig. 9 is synchronous generator rotating shaft excitation side shaft voltage during employing harmonic filtering installation of the present invention; Figure 10 is the time domain waveform of the rotating shaft shaft current of synchronous generator when adopting harmonic filtering installation of the present invention; Figure 11 is the FFT of the rotating shaft shaft current of synchronous generator when adopting harmonic filtering installation of the present invention.
Figure 12-Figure 15 is the simulation result of the high frequency shaft current component adopting harmonic filtering installation filtering common mode voltage regulation 7,9 subharmonic of the present invention to cause; N=7, corresponding branch road is the 3rd article of branch road, by the K switch of the 3rd article of branch road 3closed, n=9, corresponding branch road is the 4th article of branch road, by the K switch of the 4th article of branch road 4closed; The high frequency shaft current component that filtering common mode voltage regulation 7,9 subharmonic causes is exactly by K switch 3and K 4close, the 3rd article of branch road and the 4th article of Zhi Lutou cut operation simultaneously
Wherein Figure 12 is synchronous generator rotating shaft drive-side shaft voltage during employing harmonic filtering installation of the present invention (wherein, resistance R value is 510 ohm, and electric capacity C value is 10 microfarads, and earth resistance is 0.1 ohm); Figure 13 is synchronous generator rotating shaft excitation side shaft voltage during employing harmonic filtering installation of the present invention; Figure 14 is the time domain waveform of the rotating shaft shaft current of synchronous generator when adopting harmonic filtering installation of the present invention; Figure 15 is the FFT of the rotating shaft shaft current of synchronous generator when adopting harmonic filtering installation of the present invention.
Fig. 3 shows that the common-mode voltage fundamental frequency that static excitation system exports is 150 hertz, and the change of current of three-phase full-controlled bridge rectifier will cause high frequency common mode voltage spikes.Fig. 4-Fig. 7 shows that the shaft voltage filter mentioned in background technology has significant inhibitory action to high frequency shaft voltage, but the high-frequency impulse shaft voltage that the change of current of three-phase full-controlled bridge rectifier causes can not be eliminated completely, shaft current still with the fundamental frequency of common-mode voltage and 3 times, 5 times, 7 times, 9 inferior harmonic components for main component.Fig. 8-Figure 11 shows that the present invention can not only effectively suppress high frequency shaft voltage, also can 7 subharmonic (1050 hertz) component in filtering shaft current.Figure 12-Figure 15 shows that the present invention can not only effectively suppress high frequency shaft voltage, also can 7 subharmonic (1050 hertz) in filtering shaft current and 9 subharmonic (1350 hertz) component
In sum, the present invention is while significantly suppressing high frequency shaft voltage, can the synchronous generator high frequency shaft current that causes of filtering static excitation system output common mode voltage subharmonic selectively, can be used for the control of synchronous generator static excitation shaft voltage and shaft current.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.

Claims (7)

1. a harmonic filtering installation, it is characterized in that: comprise electric capacity C, resistance R and passive harmonic filter, described electric capacity C, resistance R and passive harmonic filter are in parallel, one end ground connection of described electric capacity C, resistance R and passive harmonic filter parallel circuits, another termination synchronous generator rotating shaft excitation side, described synchronous generator rotating shaft driving side ground connection;
Described passive harmonic filter comprises some branch roads in parallel, and i-th branch road comprises the K switch of series connection i, electric capacity C iand inductance L i, wherein i is positive integer.
2. a kind of harmonic filtering installation according to claim 1, is characterized in that: the electric capacity C of described passive harmonic filter iand inductance L ivalue meets following equation
L i C i = 1 ( 2 π f n ) 2
Wherein, inductance L iunit be Henry, electric capacity C iunit be farad, f nfor the frequency of the high frequency shaft current component that common-mode voltage n-th subharmonic of wanted filtering causes, unit is hertz, f n=150n, n=2i+1.
3. a kind of harmonic filtering installation according to claim 1, is characterized in that: described electric capacity C, resistance R are connected with synchronous generator rotating shaft excitation side by rapid fuse with one end of passive harmonic filter parallel circuits.
4. a kind of harmonic filtering installation according to claim 1-3 any one, is characterized in that: every bar branch road of described passive harmonic filter is also in series with rapid fuse.
5. a kind of harmonic filtering installation according to claim 1, is characterized in that: described resistance R value is 510 ohm.
6. a kind of harmonic filtering installation according to claim 1, is characterized in that: described electric capacity C value is 10 microfarads.
7., based on the method for a kind of harmonic filtering installation filtering high frequency shaft current according to claim 1, it is characterized in that: comprise the following steps,
Step one, when each branch switch of passive harmonic filter all disconnects, carries out record wave measurement to the shaft voltage of synchronous generator;
Step 2, carrying out FFT and auto-power spectrum analysis successively to measuring the shaft voltage obtained, finding common-mode voltage several times harmonic component;
Step 3, close the switch corresponding with harmonic component, and the high frequency shaft current component that the common-mode voltage several times harmonic wave given prominence to filtering causes is target, filtering corresponding high frequency shaft current component.
CN201510047685.XA 2015-01-29 2015-01-29 Harmonic filtering device and method for filtering high-frequency shaft current Pending CN104638890A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109885881A (en) * 2019-01-18 2019-06-14 北京交通大学 A kind of determination method for the critical shaft current causing bearing galvano-cautery
WO2024001751A1 (en) * 2022-06-30 2024-01-04 苏州汇川联合动力系统股份有限公司 Electric driving system and electric vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202550555U (en) * 2012-05-09 2012-11-21 宿迁鼎英电力电子技术有限公司 Passive filter with combination of mismatching compensation and tuning filtering

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202550555U (en) * 2012-05-09 2012-11-21 宿迁鼎英电力电子技术有限公司 Passive filter with combination of mismatching compensation and tuning filtering

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
马宏忠: "《电机状态监测与故障诊断》", 31 March 2008 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109885881A (en) * 2019-01-18 2019-06-14 北京交通大学 A kind of determination method for the critical shaft current causing bearing galvano-cautery
WO2024001751A1 (en) * 2022-06-30 2024-01-04 苏州汇川联合动力系统股份有限公司 Electric driving system and electric vehicle

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Effective date of registration: 20151110

Address after: 211102 No. 58 Su Yuan Avenue, Nanjing, Jiangsu

Applicant after: State Grid Corporation of China

Applicant after: JIANGSU ELECTRIC POWER Co.

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Application publication date: 20150520

RJ01 Rejection of invention patent application after publication