CN102624009A - Reactive compensation and power filtering device based on two stage inductance and switching method thereof - Google Patents
Reactive compensation and power filtering device based on two stage inductance and switching method thereof Download PDFInfo
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- CN102624009A CN102624009A CN2012101066562A CN201210106656A CN102624009A CN 102624009 A CN102624009 A CN 102624009A CN 2012101066562 A CN2012101066562 A CN 2012101066562A CN 201210106656 A CN201210106656 A CN 201210106656A CN 102624009 A CN102624009 A CN 102624009A
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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
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Abstract
Disclosed are a reactive compensation and power filtering device based on two stage inductance and a switching method thereof. The reactive compensation and power filtering device comprises a reactor group, a filter capacitor and a second switch which is laterally connected to a first reactor, wherein the reactor group and the filter capacitor are in a series connection with each other and are connected with an electric power line through a first switch, a connection point of one end of the second switch is directly connected to the electric power line. When a branch circuit is switched on, firstly the first switch is closed to connect the branch circuit to the electric power line and enable the second switch to be in an off state, after a working current of the branch circuit is subjected to delay buffer, the second switch is closed to short circuit two ends of the first reactor, after further delay buffer, the first switch is switched off to enable the first reactor to exit from the branch circuit, and the branch circuit is changed into a logic circuit (LC) formed by series connection between a second inductance and the filter capacitor and enters into a stable reactive compensation state. The reactive compensation and power filtering device based on the two stage inductance and the switching method thereof can be applied to reactive compensation and power filtering devices and switching methods thereof of power systems, especially high voltage systems.
Description
Technical field
The invention belongs to the reactive power compensation and the electric filtering technical field of electric power system, particularly a kind of reactive power compensation and power filter device and operation/cutting method thereof that is used for high-voltage electric power system based on the two-stage inductance.
Technical background
For high pressure (for example 10-35kV) electric power system; When need reactive compensation capacity during at large-scope change; One of traditional scheme is to adopt " forward duty ", and in electric power system, its advantage is simple in structure with the direct switching of single tuning branch road of 6% reactance Rate; But shove when its shortcoming is input big, longer duration, even can excite resonance.Two of scheme is to adopt " reverse operation system "; The employing that is disclosed like the ZL200820135702.0 utility model patent is based on the SVC reactive power compensation scheme of magnetic valve type controllable reactor; Its shortcoming is very little even when being 0 when the reactive power that needs compensation, magnetic valve type controllable reactor absorbs perceptual idle very greatly even be 100%.Because the basic principle of this reactor is a magnetic saturation reactor, it is to utilize supersaturation just can obtain Low ESR, and its vibration this moment, noise are very big, loss is very big and produce bigger harmonic current.
Summary of the invention
To the deficiency of the various schemes of prior art, how the problem that the present invention will solve does not produce when switching reactive compensator big shove but can give electric power system enough reactive power compensation power.For this reason, the present invention proposes that a kind of wherein said reactive power compensation and power filter device comprise the reactor group based on the reactive power compensation of two-stage inductance and the operation/cutting method of power filter device, and said reactor group is composed in series by first reactor and second reactor at least; Also comprise filtering capacitor, said reactor group and filtering capacitor are connected in series and form LC reactive power compensation and electric filtering branch road, and said branch road is connected with power circuit through first switch; It is characterized in that comprise that also the side is connected on the second switch on said first reactor, a tip node of said second switch is directly connected to power circuit; When dropping into said branch road, at first closed said first switch makes said branch road be connected to power circuit and said second switch is in off-state; After the operating current of said branch road cushions through time-delay; Closed said second switch makes two terminal shortcircuits of said first reactor; Cut off said first switch through time-delay buffering back again; Said first reactor is withdrawed from from said branch road, and said branch road becomes by connect with the filtering capacitor lc circuit formed and get into stable reactive power compensation state of said second inductance.
Wherein, Said side connects and is meant like accompanying drawing 1 or syndeton shown in Figure 2; One tip node of said second switch is connected with an end of said first reactor, thereby and the other end contact of said second switch is connected with the bus of electric power system when said second switch closes a floodgate and can said first reactor and first switch be given bypass (short circuit).
Wherein, can control the closed or disconnection of said first switch, said second switch automatically through controller (for example power factor controller).
A kind of reactive power compensation and power filter device based on the two-stage inductance that is applied to said method comprises the reactor group, and said reactor group is composed in series by first reactor and second reactor at least; Also comprise filtering capacitor, LC reactive power compensation and electric filtering branch road that said reactor group and filtering capacitor are connected in series and form, said branch road is connected with power circuit through first switch; It is characterized in that comprise that also the side is connected on the second switch on said first reactor, a tip node of said second switch is directly connected to power circuit.
Further technical scheme can also be that the capacity of said first reactor is less than the capacity of said second reactor.
Further technical scheme can also be said first reactor and the coaxial setting of said second reactor.
Further technical scheme can also be that the two ends of said capacitor are parallel with discharge coil.
Further technical scheme can also be, said branch road is three, and an end of three said branch roads links together and the other end is connected to respectively on three phase lines of power circuit.
Further technical scheme can also be, also comprises power factor controller, and said power factor controller is detecting the action of said first switch of reactive power compensation signal rear drive and said second switch.
According to technique scheme; In the time will dropping into reactive power compensation and electric filtering branch road; Earlier with said first switch closure; Said reactive power compensation and electric filtering propped up initial inductance and the filtering capacitor that said first reactor of route, said second reactor form and were composed in series this moment, and the reactance Rate XK1 of said branch road (%) is big [for example XK1 (%)=12 (%)], and the impulse current of said branch road when input is just less; Through the time-delay buffering of short period, the operating current of said branch road tends towards stability, and this moment is closed with said second switch again; Make the said first reactor short circuit; Even owing to have mutual inductance between said first inductance and said second inductance but mutual inductance is also less, only flow through minimum short circuit current in said first reactor, the time-delay through the short period cushions again; Said first switch is broken off; Said branch road became by second reactor and connected with said filtering capacitor and form this moment, and its reactance Rate XK2 (%) has only XK1 (%) about half [for example XK2 (%)=6 (%)], the stable reactive power compensation operating state of said branch road entering.
Because said branch road does not break from electrical network in transfer process all the time, just the inductance of series connection becomes smaller value by higher value, thereby impulse current (shoving) is little in the transfer process.
According to technique scheme; When needs break away from power circuit with reactive power compensation and electric filtering branch road, with the operation of opposite program, promptly; At first closed said first switch; Cut off said second switch again after the operating current of said branch road cushions through time-delay said first reactor is devoted oneself to work, through said first switch of time-delay buffering back cut-out, make said branch road break away from power circuit fully again.Cut off in the said branch road process like this and also can not cause the impact of big electric current, but also can utilize the switching process of said first switch or said second switch to regulate the reactive power compensation amount automatically power circuit.Can certainly directly at first cut off said second switch directly breaks away from said branch road from power circuit.
According to technique scheme, said branch road can and insert in the same phase line of power circuit for several simultaneously, needs how many idle how many bar branch roads of just throwing; Or insert respectively in the out of phase phase line.
Because the present invention has These characteristics and advantage, can be applied to electric power system particularly in the reactive power compensation and power filter device and operation/cutting method thereof of high-pressure system.
Description of drawings
Fig. 1 is a structural representation of using a branch road of technical scheme of the present invention;
Fig. 2 is the structural representation that three branch roads of application technical scheme of the present invention are connected to three-phase line respectively.
Embodiment
As shown in Figure 1, reactive power compensation and power filter device based on the two-stage inductance comprise the reactor group, and said reactor L group is by being composed in series before and after the first reactor L1 and the second reactor L2; Also comprise filtering capacitor C; LC reactive power compensation and electric filtering branch road that said reactor group L and filtering capacitor C are connected in series and form; Said branch road is connected with the A of power circuit through the first K switch M1, and the two ends of said filter capacitor C also are parallel with discharge coil Lf.The said first reactor L1 and the second reactor L2 are air core inductor and coaxial stacking, between the two mutual inductance M less (general mutual inductance M be greatly inductance value 10%).Certainly the said first reactor L1 and the second reactor L2 also can be separates fully two reactors independently separately, but the cost of employing coaxial electrical resistive connection structure is low.
Also comprise second switch KM2; The tip node of said second switch KM2 is directly connected to the A phase of power circuit; Another end points is connected on the connecting point position a between said first reactor L1 and the said second reactor L2, and said like this second switch KM2 constitutes the other access node structure to the said first reactor L1.Said first K switch M1 and said second switch KM2 are in off-state when all unloading.
Also comprise power factor controller K, when said power factor controller K detects circuit and needs reactive power compensation, utilize PLC control to send instruction automatically and drive said first K switch M1 and said second switch KM2 sequentially-operating.
When requiring said branch road to drop into, power factor controller K sends instruction, and it is closed to drive the said first K switch M1; The reactance Rate XK1 (%) of said branch road is by initial inductance L12 (L12=L1+L2+2M at this moment; M is the mutual inductance between L1 and L2) and the electric capacity of filtering capacitor C confirm, XK1 (%)=12 (%) for example, impulse current is very little during input; When the effluxion t of the said first K switch M1 make delay buffering electric current of said branch road is tended towards stability or complete stability after after (for example t1=30 second); Closed more said second switch KM2 with the said first reactor L1 short circuit (bypass), flows through the little short circuit current of being confirmed by said second reactor L2 and M in the said first reactor L1; Said branch road tend towards stability through t2 electric current second or complete stability after after (for example t2=10 second); The said first K switch M1 breaks off the said first reactor L1, and this moment, said said second reactor KM2 of route and filtering capacitor C were in series, and its reactance Rate is XK2 (%); XK2 (%)=6 (%) for example, said branch road gets into stable reactive power compensation running status.
When require said branch road from reactance Rate be the steady operational status (for example XK2 (%)=6 (%)) of XK2 (%) when withdrawing from electrical network, power factor controller K sends instruction, said second switch KM2 breaks off, said branch road withdraws from compensation.Also can be that the earlier closed said first K switch M1 breaking off said second switch KM2 through time-delay buffering back, through after the time-delay buffering, breaks off the said first K switch M1 more at last.
Secondly; K sends instruction according to power factor controller, and said branch road can be changed between dropping into and withdrawing from, and when the reactance Rate of branch road described in the corresponding input process begins, is XK1 (%) (bigger); Through less time-delay; Its reactance Rate becomes XK2 (%) (less), gets into steady operational status, so constantly the reactive power of the said Zhi Luxiang power circuit conveying of adjustment.
Be short time duty wherein owing to the said first reactor L1, can its Capacity design is very little, less than the capacity of the said second reactor KM2, cost is very low for this reason at least.
Reactance Rate XK2 (%) for said branch road; Can confirm according to the requirement of filtering, for example will weaken 5,7 subharmonic of three-phase electrical power system, can select for use about XK2 (%)=6%; Weaken 3 subharmonic of Monophase electric power system, can select for use about XK2 (%)=12%.Also different reactance Rate can be set for many branch roads, with the different times harmonics of filtering.
As shown in Figure 2, be the structural representation that three said branch roads are applied to the three-phase power circuit.Wherein said first K switch M1 or said second switch KM2 are respectively coaxial threephase switch, and the tail end 0 of three said branch roads links together, and the A phase, B that an other end is connected on power circuit respectively mutually and C mutually in the circuit.
The present invention not only is confined to above-mentioned embodiment; Persons skilled in the art are according to content disclosed by the invention; Can adopt other multiple embodiment embodiment of the present invention, therefore, every employing project organization of the present invention and thinking; Do some simple designs that change or change, all fall into the scope of the present invention's protection.
Claims (8)
1. one kind based on the reactive power compensation of two-stage inductance and the operation/cutting method of power filter device, and wherein said reactive power compensation and power filter device comprise the reactor group, and said reactor group is composed in series by first reactor and second reactor at least; Also comprise filtering capacitor, said reactor group and filtering capacitor are connected in series and form LC reactive power compensation and electric filtering branch road, and said branch road is connected with power circuit through first switch; It is characterized in that comprise that also the side is connected on the second switch on said first reactor, a tip node of said second switch is directly connected to power circuit; When dropping into said branch road, at first closed said first switch makes said branch road be connected to power circuit and said second switch is in off-state; After the operating current of said branch road cushions through time-delay; Closed said second switch makes two terminal shortcircuits of said first reactor; Cut off said first switch through time-delay buffering back again; Said first reactor is withdrawed from from said branch road, and said branch road becomes by connect with the filtering capacitor lc circuit formed and get into stable reactive power compensation state of said second inductance.
2. according to claim 1 based on the reactive power compensation of two-stage inductance and the operation/cutting method of power filter device; It is characterized in that; When cutting off said branch road, cut off said second switch again after at first closed said first switch, the operating current of said branch road cushion through time-delay said first reactor is devoted oneself to work; Cut off said first switch through time-delay buffering back again, make said branch road break away from power circuit fully.
3. a reactive power compensation and a power filter device based on the two-stage inductance that is applied to claim 1 or 2 said methods comprises the reactor group, and said reactor group is composed in series by first reactor and second reactor at least; Also comprise filtering capacitor, LC reactive power compensation and electric filtering branch road that said reactor group and filtering capacitor are connected in series and form, said branch road is connected with power circuit through first switch; It is characterized in that comprise that also the side is connected on the second switch on said first reactor, a tip node of said second switch is directly connected to power circuit.
4. reactive power compensation and power filter device based on the two-stage inductance according to claim 3 is characterized in that the capacity of said first reactor is less than the capacity of said second reactor.
5. reactive power compensation and power filter device based on the two-stage inductance according to claim 3 is characterized in that, said first reactor and the coaxial setting of said second reactor.
6. reactive power compensation and power filter device based on the two-stage inductance according to claim 3 is characterized in that the two ends of said capacitor are parallel with discharge coil.
7. according to claim 3,4,5 or 6 described reactive power compensation and power filter devices based on the two-stage inductance, it is characterized in that said branch road is three, an end of three said branch roads links together and the other end is connected to respectively on three phase lines of power circuit.
8. reactive power compensation and power filter device based on the two-stage inductance according to claim 7; It is characterized in that; Also comprise power factor controller, said power factor controller is detecting the action of said first switch of reactive power compensation signal rear drive and said second switch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210106656.2A CN102624009B (en) | 2012-04-05 | 2012-04-05 | Reactive compensation and power filtering device based on two stage inductance and switching method thereof |
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| CN201210106656.2A CN102624009B (en) | 2012-04-05 | 2012-04-05 | Reactive compensation and power filtering device based on two stage inductance and switching method thereof |
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| CN102624009A true CN102624009A (en) | 2012-08-01 |
| CN102624009B CN102624009B (en) | 2014-11-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438315A (en) * | 2016-11-10 | 2017-02-22 | 广东美的制冷设备有限公司 | Compressor control circuit of fixed-frequency air conditioner and fixed-frequency air conditioner |
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| US20080278976A1 (en) * | 2007-05-11 | 2008-11-13 | Schneider Robert S | Dynamic voltage sag correction |
| CN101859157A (en) * | 2010-07-20 | 2010-10-13 | 哈尔滨威瀚电气设备股份有限公司 | Current compensation type alternating-current voltage stabilizer |
| CN102035196A (en) * | 2010-12-30 | 2011-04-27 | 东南大学 | Thyristor controlled series compensator-based fault current limiting device |
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2012
- 2012-04-05 CN CN201210106656.2A patent/CN102624009B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080278976A1 (en) * | 2007-05-11 | 2008-11-13 | Schneider Robert S | Dynamic voltage sag correction |
| CN101859157A (en) * | 2010-07-20 | 2010-10-13 | 哈尔滨威瀚电气设备股份有限公司 | Current compensation type alternating-current voltage stabilizer |
| CN102035196A (en) * | 2010-12-30 | 2011-04-27 | 东南大学 | Thyristor controlled series compensator-based fault current limiting device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438315A (en) * | 2016-11-10 | 2017-02-22 | 广东美的制冷设备有限公司 | Compressor control circuit of fixed-frequency air conditioner and fixed-frequency air conditioner |
| CN106438315B (en) * | 2016-11-10 | 2018-08-14 | 广东美的制冷设备有限公司 | A kind of fixed frequency air conditioner compressor Control Cprant and air-conditioner with fixed frequency |
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| CN102624009B (en) | 2014-11-05 |
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Effective date of registration: 20200615 Address after: 528311 No. 4 Huanzhen East Road, Beijiao Town, Shunde District, Foshan City, Guangdong Province Patentee after: FOSHAN SHUNDE EAGLERISE ELECTRIC POWER TECHNOLOGY Co.,Ltd. Address before: 528000, A3, Guicheng science and Technology Park, Jian Ping Road, Nanhai District, Guangdong, Foshan Patentee before: EAGLERISE ELECTRIC & ELECTRONIC (CHINA) Co.,Ltd. |