CN101795000A - Power capacitor dynamic tuning-off device and control method - Google Patents
Power capacitor dynamic tuning-off device and control method Download PDFInfo
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- CN101795000A CN101795000A CN201010125621A CN201010125621A CN101795000A CN 101795000 A CN101795000 A CN 101795000A CN 201010125621 A CN201010125621 A CN 201010125621A CN 201010125621 A CN201010125621 A CN 201010125621A CN 101795000 A CN101795000 A CN 101795000A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims description 13
- 238000013016 damping Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 230000001629 suppression Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
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- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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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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- 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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention relates to a power capacitor dynamic tuning-off device and control method, belonging to the technical field of power system automatic control. The power capacitor dynamic tuning-off device comprises a first-order three-phase harmonic filter and a second-order three-phase harmonic filter, and each harmonic filter contains a capacitor, an inductor and a bidirectional thyristor. An embedded MCU and a control circuit are introduced in the device of the invention, the structure is simple, the control is flexible, and the device can be used to protect the power capacitor form damaging, protect the grid to run safely, prevent the occurrence of power faults, and ensure the power capacitor to be continuously in a work state so as to play a role in harmonic suppression and reactive power compensation.
Description
Technical field
The invention belongs to Automation of Electric Systems control technology field, be specially adapted to a kind of power capacitor dynamic tuning-off device and control method.
Background technology
At present, in the high-low pressure electric power system, power rectifier equipment and RHVC are widely used, and its particular structure and advanced technology bring convenience to the user, and in the time of efficient and huge interests, its weak point also is tangible.Be the non-linear of it, impact and the uneven electrical characteristics of using: public electric wire net is injected a large amount of harmonic wave and reactive power, make the quality of power supply that the trend of obvious deterioration be arranged.In order effectively to absorb harmonic current and compensating power,,, adopt the harmonic wave passive filter formed by inductance and electric capacity and compensator to carry out protection usually to electrical network because of the factor of aspects such as cost and technology in high-low pressure power supply industry spot.
In fact, statistics shows, is increased by the electric current that harmonic wave causes in industrial occasions, the phenomenon of burning capacitor box equipment often takes place, and main cause is not a harmonic wave itself, but capacitor box designs improper generation parallel resonance, cause the harmonic current amplification and cause that in addition, in a single day capacitor produces harmonic current and amplify, its consequence is normally quite serious, not only can burn capacitor itself, when serious, also can make contactor, feeding switch, even transformer all burnt, and causes serious electric power accident.
At contingent above-mentioned situation, traditional processing method has following two kinds: (1) adopts the method for metal stretching rather than riveted joint to make the housing of power capacitor to gain in strength and sealing, when electric capacitor causes damaging because harmonic current amplifies, it is disconnected that the strength that dependence gas expands is earned the lead-in wire of electric capacitor, obviously, this physical treatment method only is a kind of defensive measure; (2) at the terminals of low voltage power capacitor; a miniature air switch that is complementary with the power capacitor rated current is installed; when the real work electric current of power capacitor surpasses certain numerical value of its rated current; the miniature air switch is cut off the electricity supply automatically, reaches the purpose that the protection power capacitor is not damaged.Facts have proved, because the influence of various factors adopt the still unavoidable power capacitor of this method to suffer damage, and in case power capacitor does not drop into electrical network, reactive power compensation has also just lost meaning.
For the bigger occasion of harmonic ratio, traditional method is: adopt single order or second order to have the passive filter technology that absorbs the harmonic current effect usually, wherein single order harmonic filter structure is an electric capacity, and inductance and damping resistance series connection are called single tuned filter again; The second harmonic filter construction be electric capacity with inductance and damping resistance parallel connection after connect, these two kinds of traditional technical schemes because simple in structure, cost is low, and uses in a large number in the industry.
But, because power capacitor is in the long-term work process, capacitance, parameters such as insulation and loss angle all can change, parameter own changes after power capacitor has passed through a stage use, perhaps because the operating modes such as load of working site change, and the situation that all can cause harmonic current to amplify again, formation accident at last causes the loss of equipment.
Summary of the invention
In order to remedy the deficiency of above electric capacitor protection structure; purpose of the present invention provides a kind of electric capacitor tuning-off device and control method; introduced with the embedded scm is the microelectric technique of core; electric capacitor is implemented dynamic tuning-off; to reach protection, make it purpose of safe operation to power supply network system.
Technical scheme of the present invention is achieved in that the electric capacitor tuning-off device includes single order three phase harmonic filter and second order three phase harmonic filter.
Wherein, single order three phase harmonic filter includes electric capacity, inductance, bidirectional thyristor, bidirectional thyristor is approximately the damping resistance in the circuit, connect: electric capacity, inductance, bidirectional thyristor series connection in every circuitry phase, every phase current mutual inductor is connected with the controller input in the three-phase circuit, and controller output end is connected with the thyristor control end respectively;
Described second order three phase harmonic filter includes electric capacity, inductance, bidirectional thyristor, bidirectional thyristor are approximately the damping resistance in the circuit, connect: be connected in series after electric capacity and inductance and the bidirectional thyristor parallel connection in every circuitry phase, equally, every phase current mutual inductor is connected with the controller input in the three-phase circuit, and controller output end is connected with the thyristor control end respectively, simultaneously, controller output is connected with control relay by taking off humorous executive circuit, and control relay connects the contactor of main circuit.
Above-mentioned controller circuit structure is: with the single-chip microcomputer is core, includes A/D converter and E in the single-chip microcomputer
2Prom memory; The A/D converter input is connected with three-phase circuit input current transformer, and the A/D converter output is connected with the input of single-chip microcomputer; Single-chip microcomputer by debugging interface respectively with key be set be connected with nixie display; In addition, single-chip microcomputer output by the three-phase photoisolator with take off humorous executive circuit input and be connected, it took off humorous executive circuit output and connects with the thyristor control end of every main circuit mutually respectively when harmonic filter was single order, it took off humorous executive circuit output and still connects with the thyristor control end of every main circuit mutually respectively when harmonic filter was second order, simultaneously, take off humorous executive circuit output and also connect control relay, control relay connects the main circuit contact device.
It is input with system's three-phase current detection that the present invention forms one, and single-chip microcomputer is the control core device, and bidirectional thyristor is as the closed-loop control system of output performance element.
The safe operation of power capacitor of the present invention is to realize by the control circuit of electric capacitor tuning-off device.
Electric capacitor tuning-off device control method step is as follows:
Step 1: at first carry out system initialization, comprise the IO ports-settings, System self-test, communication baud rate is set, and accesses and is stored in E
2Among the PROM parameter is set;
Step 2: the AD ALT-CH alternate channel test three-phase current by single-chip microcomputer, the limit absolute figure that test number and system have been set compares;
Step 3: relatively transfinite, then, carry out time delay, return the detection link of three-phase current after time delay a period of time, check that the electric current that whether exists surpasses the situation of absolute figure by specification requirement inverse time lag principle;
1) be then to start and withdraw from control program:
For the then complete cutoff thyristor of single order harmonic filter;
Then turn-off the main circuit contact device for the second harmonic filter, light the LED alarm lamp;
2), then do not enter the next link of judging;
Step 4: the current values and the numerical value bound of having set of test are compared, adjust the angle of flow of thyristor, make system works in a suitable current scope;
Step 5: in system's running, have to need to change parameter is set, enter parameter link is set, parameter deposits the E of single-chip microcomputer in after setting completed
2In the PROM, when system start-up next time, can call in this control system once more.
Advantage of the present invention: in device, introduce with embedded scm and control circuit; simple in structure; control flexibly; not only can protect power capacitor itself not to be damaged; electric power netting safe running; prevent the generation of electric power accident, can also make electric capacitor in running order all the time, play the effect of harmonic wave control or reactive power compensation.
Description of drawings
Fig. 1 is a power capacitor dynamic tuning-off device the second harmonic filter construction schematic diagram of the present invention;
Fig. 2 is a power capacitor dynamic tuning-off device single order harmonic filter structure principle chart of the present invention;
Fig. 3 is a power capacitor dynamic tuning-off device controller block diagram of the present invention;
Fig. 4 is a power capacitor dynamic tuning-off device current detecting electrical schematic diagram of the present invention;
Fig. 5 is power capacitor dynamic tuning-off device photoisolator of the present invention and bidirectional thyristor control electrical schematic diagram;
Fig. 6 is a power capacitor dynamic tuning-off device control relay electrical schematic diagram of the present invention;
Fig. 7 is a power capacitor dynamic tuning-off device control procedure flow chart of the present invention.
Among the figure, 1 three-phase current is imported 23 road A/D converters, 3 central controller MCU, 4 E
2PROM 5 remote data indicators 6 are external to be provided with key 7 photoisolators and to take off humorous executive circuit 8 control relays 9 contactors 10 controllers
Embodiment
Power capacitor dynamic tuning-off device of the present invention and control method are illustrated in conjunction with the accompanying drawings and embodiments.
The second harmonic filter apparatus structure chart of the present invention in Fig. 1, is an example with typical the second harmonic filter as shown in Figure 1, and operation principle of the present invention has been described.
Controller of the present invention is by three small current instrument transformer CTA, and CTB, CTC obtain three power capacitor CA, CB, the line current of CC, three inductance L A, LB, LC respectively with three power capacitor CA, CB, the CC series connection becomes star-like connection, three bidirectional thyristor TRA, TRB, TRC is equivalent to three resistance that can regulate, respectively with three inductance L A, LB, the LC parallel connection, whether controller is judged the working condition of system by constantly detecting current operating current, be in the normal working region, if the situation that harmonic current amplifies has taken place because of various reasons, then controller is by adjusting thyristor TRA, TRB, the angle of flow of TRC is revised, under extreme case, when the harmonic current of system is amplified to outside this device adjusting range, when threatening native system safety, can also carry out power-off protection by disconnecting contactor 9;
Similarly, for the single order harmonic filter, system construction drawing of the present invention as shown in Figure 2, compared to Figure 1, its difference is, three main elements: capacitor C, inductance L and thyristor TR are connected in series, do not have contactor 9 in Fig. 2, because of when thyristor TR turn-offs fully, capacitor C and inductance L have just broken away from main power source.
By Fig. 3, Fig. 4 as can be known, core component of the present invention is the controller 10 among the figure, below the explanation controller 10 structural principle:
The structural principle block diagram of controller 10 as shown in Figure 3, the core of controller is an embedded scm, in order to reduce the workpiece of main frame, adopt the nixie display that key and external are set of external, they only use when debugging, signal flow of the present invention is: the signal after three-phase current is detected, AD ALT-CH alternate channel through embedded scm inside enters single-chip microcomputer central controller MCU, by the interactive external key 6 that is provided with, with remote data indicator 5, with the relevant parameter such as the rated current of native system, critical current etc. are stored in the E that can cut off the power supply and preserve in advance
2Among the PROM;
The current detecting part electrical schematic diagram of invention as shown in Figure 4, three tested electric currents are through after the halfwave rectifier, in capacitor C 1, C2, the last formation of C3 dc voltage drop, then, by resistance R 1, R3, R5 deliver to the AD input of single-chip microcomputer.
Single-chip microcomputer of the present invention is isolated way of output control thyristor angle of flow part with photoelectricity, can reduce interference, its electrical schematic diagram as shown in Figure 5, in Fig. 5, the electrical schematic diagram of controlling output mutually that only drawn wherein, the circuit of other two-phases is identical therewith;
The electrical schematic diagram of single-chip microcomputer output control relay part of the present invention as shown in Figure 6;
Under the cooperation of control method, continuous compare test current values of central controller MCU and stored parameters value in advance, in the ordinary course of things, if take place unusual, central controller MCU can by adjust bidirectional thyristor TR the angle of flow revise, under extreme case, if actual current values takes place installs outside the adjustable scope at this, and when threatening native system safety, central controller MCU can also be by disconnecting contactor 9, make system withdraw from main power source, carry out power-off protection; Embedded scm select principle for use: must possess 3 AD analog quantity channels, 3 input switch amount interfaces are as key is set, 4 output switching value interfaces are isolated output as photoelectricity, control product brake tube and contactor, the serial communication interface of 2 display parts, in addition, the E that can cut off the power supply and preserve is contained in inside
2Prom memory;
Systems soft ware flow chart of the present invention as shown in Figure 7, Control work flow process of the present invention is as follows:
In Fig. 7, after system powers on, at first carry out system initialization, comprise the IO ports-settings, System self-test, communication baud rate is set, and accesses and is stored in E
2Among the PROM parameter or the like is set; Afterwards, enter the working link of system;
At first, AD ALT-CH alternate channel test three-phase current by single-chip microcomputer, the absolute figure that test number and system have been set compares, if surpass, then according to the inverse time lag principle of electric switch industry, carry out time delay, return the detection link of three-phase current after time delay a period of time, see that the electric current that whether exists surpasses the situation of absolute figure, if then start the program that logs off: the second harmonic filter is turn-offed the main circuit contact device or for the complete cutoff thyristor of single order harmonic filter, lights the LED alarm lamp, if not, then enter the next link of judging;
Next step is the current values of test and the numerical value bound of having set are compared, thereby the angle of flow of adjustment thyristor to make system works in a suitable current scope;
Final step is, in system work process, needs to change when the instruction of parameter is set if having, and enters parameter link is set, and parameter deposits the E of single-chip microcomputer in after setting completed
2In the PROM, when system powers on next time, can call in this control system once more.
Claims (3)
1. power capacitor dynamic tuning-off device, it is characterized in that: this device includes single order three phase harmonic filter and second order three phase harmonic filter, wherein, single order three phase harmonic filter includes electric capacity, inductance, bidirectional thyristor, bidirectional thyristor is approximately the damping resistance in the circuit, connect: electric capacity, inductance, bidirectional thyristor series connection in every circuitry phase, every phase current mutual inductor is connected with the controller input in the three-phase circuit, and controller output end is connected with the thyristor control end respectively; This second order three phase harmonic filter includes electric capacity, inductance, bidirectional thyristor, bidirectional thyristor is approximately the damping resistance in the circuit, connect: be connected in series after electric capacity and inductance and the bidirectional thyristor parallel connection in every circuitry phase, equally, every phase current mutual inductor is connected with the controller input in the three-phase circuit, controller output end is connected with the thyristor control end respectively, controller output is connected with control relay by taking off humorous executive circuit, and control relay connects the contactor of main circuit, and it is input with the three-phase current detection that this device forms one, single-chip microcomputer is a core controller, and bidirectional thyristor is as the closed-loop control system of output performance element.
2. the power capacitor dynamic tuning-off device according to claim 1 is characterized in that: described controller circuit structure is: be core with the single-chip microcomputer, include A/D converter and E in the single-chip microcomputer
2Prom memory; The A/D converter input is connected with three-phase circuit input current transformer, and the A/D converter output is connected with the input of single-chip microcomputer; Single-chip microcomputer is connected with remote data indicator with the external key that is provided with respectively by debugging interface; In addition, single-chip microcomputer output by the three-phase photoisolator with take off humorous executive circuit input and be connected, it took off humorous executive circuit output and connects with the thyristor control end of every main circuit mutually respectively when harmonic filter was single order, it took off humorous executive circuit output and still connects with the thyristor control end of every main circuit mutually respectively when harmonic filter was second order, simultaneously, take off humorous executive circuit output and also connect control relay, control relay connects the main circuit contact device.
3. power capacitor dynamic tuning-off device control method, it is characterized in that: electric capacitor tuning-off device control method step is as follows:
Step 1: at first carry out system initialization, comprise the IO ports-settings, System self-test, communication baud rate is set, and accesses and is stored in E
2Among the EPROM parameter is set;
Step 2: the A/D ALT-CH alternate channel test three-phase current by single-chip microcomputer, the limit absolute figure that test number and system have been set compares;
Step 3: relatively transfinite, then, carry out time delay, return the detection link of three-phase current after time delay a period of time, check that the electric current that whether exists surpasses the situation of absolute figure by specification requirement inverse time lag principle;
1) be then to start and withdraw from control program:
For the then complete cutoff thyristor of single order harmonic filter;
Then turn-off contactor for the second harmonic filter, light the LED alarm lamp;
2), then do not enter the next link of judging;
Step 4: the current values and the numerical value bound set of test are compared, thereby adjust thyristor the angle of flow, make system works in a suitable current scope;
Step 5: in system's running, have to need to change parameter is set, enter parameter link is set, parameter deposits the E of single-chip microcomputer in after setting completed
2In the PROM, when system start-up next time, can call in this control system once more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101256214A CN101795000B (en) | 2010-03-17 | 2010-03-17 | Power capacitor dynamic tuning-off device and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101256214A CN101795000B (en) | 2010-03-17 | 2010-03-17 | Power capacitor dynamic tuning-off device and control method |
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| Publication Number | Publication Date |
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| CN101795000A true CN101795000A (en) | 2010-08-04 |
| CN101795000B CN101795000B (en) | 2012-07-04 |
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| CN2010101256214A Expired - Fee Related CN101795000B (en) | 2010-03-17 | 2010-03-17 | Power capacitor dynamic tuning-off device and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624000A (en) * | 2012-04-12 | 2012-08-01 | 河海大学 | Power system harmonic state estimation method based on automatic differentiation |
| CN106712018A (en) * | 2016-12-16 | 2017-05-24 | 董嵩华 | Higher harmonic filtering device based on balanced harmonic wave absorption and elimination |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06153400A (en) * | 1992-11-02 | 1994-05-31 | Shinwa Giken:Kk | Efficiency improving unit in power use |
| EP1503475A1 (en) * | 2003-07-30 | 2005-02-02 | Siemens Aktiengesellschaft | Connecting process for a reactive power compensator |
| CN2701143Y (en) * | 2004-06-16 | 2005-05-18 | 杨国权 | Zero-current switched dynamic reactive power compensation or harmonic wave governing apparatus |
| CN2788434Y (en) * | 2005-03-11 | 2006-06-14 | 武汉港迪电气有限公司 | Harmonious restrain and non-power on-spot compensating device |
| JP2006271070A (en) * | 2005-03-23 | 2006-10-05 | Toshiba Mitsubishi-Electric Industrial System Corp | Thyristor controlled reactor based svc device |
-
2010
- 2010-03-17 CN CN2010101256214A patent/CN101795000B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06153400A (en) * | 1992-11-02 | 1994-05-31 | Shinwa Giken:Kk | Efficiency improving unit in power use |
| EP1503475A1 (en) * | 2003-07-30 | 2005-02-02 | Siemens Aktiengesellschaft | Connecting process for a reactive power compensator |
| CN2701143Y (en) * | 2004-06-16 | 2005-05-18 | 杨国权 | Zero-current switched dynamic reactive power compensation or harmonic wave governing apparatus |
| CN2788434Y (en) * | 2005-03-11 | 2006-06-14 | 武汉港迪电气有限公司 | Harmonious restrain and non-power on-spot compensating device |
| JP2006271070A (en) * | 2005-03-23 | 2006-10-05 | Toshiba Mitsubishi-Electric Industrial System Corp | Thyristor controlled reactor based svc device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102624000A (en) * | 2012-04-12 | 2012-08-01 | 河海大学 | Power system harmonic state estimation method based on automatic differentiation |
| CN106712018A (en) * | 2016-12-16 | 2017-05-24 | 董嵩华 | Higher harmonic filtering device based on balanced harmonic wave absorption and elimination |
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| Publication number | Publication date |
|---|---|
| CN101795000B (en) | 2012-07-04 |
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