CN102624009B - 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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- CN102624009B CN102624009B CN201210106656.2A CN201210106656A CN102624009B CN 102624009 B CN102624009 B CN 102624009B CN 201210106656 A CN201210106656 A CN 201210106656A CN 102624009 B CN102624009 B CN 102624009B
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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
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 reactive power compensation and the electric filtering technical field of electric power system, particularly a kind of reactive power compensation based on two-stage inductance for high-voltage electric power system and power filter device and operation/cutting method thereof.
Technical background
For example, for high pressure (10-35kV) electric power system, in the time needing reactive compensation capacity at large-scope change, one of traditional scheme is to adopt " forward duty ", with the direct switching of single tuning branch road of 6% reactance Rate in electric power system, its advantage is simple in structure, but its shortcoming be shove while dropping into large, the duration is long, even can excite resonance.Two of scheme is to adopt " reverse operation system ", the SVC Scheme of Reactive Power Compensation of employing as disclosed in ZL200820135702.0 utility model patent based on magnetic valve type controllable reactor, its shortcoming is when needing the reactive power of compensation very little while being even 0, and perception that magnetic valve type controllable reactor absorbs is idle is very greatly even 100%.Because the general principle of this reactor is magnetic saturation reactor, it is to utilize supersaturation just can obtain Low ESR, and now its vibration, noise are very large, loss is very large and produce larger harmonic current.
Summary of the invention
For the deficiency of the various schemes of prior art, how the problem to be solved in the present invention does not produce in the time of switching reactive compensator large shove but can give the reactive compensation power that electric power system is enough.For this reason, the present invention proposes a kind of reactive power compensation based on two-stage inductance and the operation/cutting method of power filter device, and wherein said reactive power compensation and power filter device comprise Reactor banks, and described Reactor banks is at least composed in series by the first reactor and the second reactor; Also comprise filtering capacitor, described Reactor banks and filtering capacitor are connected in series composition LC reactive power compensation and electric filtering branch road, and described branch road is connected with power circuit by the first switch; One end of described the first switch connects power circuit, and the other end connects described the first reactor; It is characterized in that, also comprise other being connected on described the first reactor and the second switch of described the first switch, a tip node of described second switch is directly connected to power circuit; The other end is connected between described the first reactor and described the second reactor; While dropping into described branch road, first closed described the first switch make described branch road be connected to power circuit and described second switch in off-state; The operating current of described branch road is after time delay buffering, closed described second switch makes two terminal shortcircuits of described the first reactor, after time delay buffering, cut off described the first switch again, described the first reactor is exited from described branch road, and described branch road becomes by connect with filtering capacitor formed lc circuit enter stable reactive power compensation state of described the second reactor.
Wherein, described side connects the syndeton referring to as shown in accompanying drawing 1 or Fig. 2, one tip node of described second switch is connected with one end of described the first reactor, thereby and the other end contact of described second switch is connected with the bus of electric power system in the time that described second switch closes a floodgate and described the first reactor and the first switch can be given to bypass (short circuit).
Wherein, can for example, automatically control the closed of described the first switch, described second switch or disconnect by controller (power factor controller).
The reactive power compensation based on two-stage inductance and the power filter device that are applied to said method, comprise Reactor banks, and described Reactor banks is at least composed in series by the first reactor and the second reactor; Also comprise filtering capacitor, described Reactor banks and filtering capacitor are connected in series LC reactive power compensation and the electric filtering branch road of composition, and described branch road is connected with power circuit by the first switch; One end of described the first switch connects power circuit, and the other end connects described the first reactor; It is characterized in that, also comprise that side is connected on the second switch on described the first reactor and described the first switch, a tip node of described second switch is directly connected to power circuit, and the other end is connected between described the first reactor and described the second reactor.
Further technical scheme can also be that the capacity of described the first reactor is less than the capacity of described the second reactor.
Further technical scheme can also be that described the first reactor and described the second reactor coaxially arrange.
Further technical scheme can also be that the two ends of described capacitor are parallel with discharge coil.
Further technical scheme can also be, described branch road is three, and one end of three described branch roads links together and the other end is connected to respectively in three phase lines of power circuit.
Further technical scheme can also be, also comprises power factor controller, and described power factor controller is detecting the first switch and the action of described second switch described in the rear drive of reactive power compensation signal.
According to technique scheme, in the time will dropping into reactive power compensation and electric filtering branch road, first by described the first switch closure, now described reactive power compensation and electric filtering prop up initial inductance and the filtering capacitor that the first reactor described in route, described the second reactor form and are composed in series, the reactance Rate XK1 (%) of described branch road is large [for example XK1 (%)=12 (%)], and the impulse current of described branch road in the time dropping into is just less, through the time delay buffering of short period, the operating current of described branch road tends towards stability, now again by described second switch closure, make described the first reactor short circuit, even owing to having mutual inductance between described the first inductance and described the second inductance but mutual inductance is also less, in described the first reactor, only flow through minimum short circuit current, cushion through the time delay of short period again, described the first switch is disconnected, now described branch road becomes by the second reactor and connects and form with described filtering capacitor, its reactance Rate XK2 (%) only has XK1 (%) half left and right [for example XK2 (%)=6 (%)], described branch road enters stable reactive power compensation operating state.
Because described branch road does not break from electrical network all the time in transfer process, just the inductance of series connection becomes smaller value from higher value, thereby in transfer process, impulse current (shoving) is little.
According to technique scheme, in the time that reactive power compensation and electric filtering branch road are departed from power circuit by needs, with the operation of contrary program,, first closed described the first switch, the operating current of described branch road cuts off described second switch after time delay buffering again devotes oneself to work described the first reactor, then cuts off described the first switch after time delay buffering, makes described branch road depart from power circuit completely.Cut off in described branch road process and also can not cause to power circuit the impact of large electric current like this, but also can utilize the switching process of described the first switch or described second switch automatically to regulate reactive power compensation amount.Can certainly directly first cut off described second switch directly departs from described branch road from power circuit.
According to technique scheme, described branch road can and access in the same phase line of power circuit for several simultaneously, needs how many idle how many branch roads of just throwing; Or access respectively in 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.
Brief description of the drawings
Fig. 1 is the structural representation of a branch road of application technical solution of the present invention;
Fig. 2 is the structural representation that three branch roads of application technical solution of the present invention are connected to respectively three-phase line.
Embodiment
As shown in Figure 1, the reactive power compensation based on two-stage inductance and power filter device, comprise Reactor banks, and described 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, described Reactor banks L and filtering capacitor C are connected in series LC reactive power compensation and the electric filtering branch road of composition, described branch road is connected with the A of power circuit by the first K switch M1, and the two ends of described filter capacitor C are also parallel with discharge coil Lf.Described the first reactor L1 and the second reactor L2 are air core inductor coaxially stacking, between the two mutual inductance M less (10% that general mutual inductance M is larger inductance value).Certainly described the first reactor L1 and the second reactor L2 can be also separates completely two reactors independently separately, but the cost of employing coaxial electrical resistive connection structure is low.
Also comprise second switch KM2, a tip node of described 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 described the first reactor L1 and described the second reactor L2, and described like this second switch KM2 forms the other connecting structure to described the first reactor L1.Described in while all unloading, the first K switch M1 and described second switch KM2 are in off-state.
Also comprise power factor controller K, described power factor controller K detects when circuit needs reactive power compensation, utilizes PLC to control automatically to send the first K switch M1 and described second switch KM2 sequentially-operating described in order-driven.
In the time requiring described branch road to drop into, power factor controller K sends instruction, drive described the first K switch M1 closure, now the reactance Rate XK1 of described branch road (%) is by initial inductance L12 (L12=L1+L2+2M, M is the mutual inductance between L1 and L2) and the electric capacity of filtering capacitor C determine, for example XK1 (%)=12 (%), when input, impulse current is very little, when time of described the first K switch M1 make delay buffering second the electric current of described branch road is tended towards stability through t1 or complete stability after for example, after (t1=30 second), closed described second switch KM2 again, by described the first reactor L1 short circuit (bypass), in described the first reactor L1, flow through the little short circuit current of being determined by described the second reactor L2 and M, described branch road tend towards stability through t2 electric current second or complete stability after for example, after (t2=10 second), described the first K switch M1 disconnects described the first reactor L1, now described in a described route, the second reactor KM2 and filtering capacitor C are in series, its reactance Rate is XK2 (%), for example XK2 (%)=6 (%), described branch road enters stable reactive power compensation running status.
For example, in the time requiring steady operational status (XK2 (%)=6 (%)) that described branch road is XK2 (%) from reactance Rate to exit electrical network, power factor controller K sends instruction, described second switch KM2 disconnects, and described branch road exits compensation.Also can be that first closed described the first K switch M1 disconnects described second switch KM2, then after time delay buffering, finally disconnecting described the first K switch M1 after time delay buffering.
Secondly, according to power factor controller, K sends instruction, described branch road can be changed between dropping into and exiting, in the time that the reactance Rate of branch road described in corresponding input process starts, be XK1 (%) (larger), through less time delay, its reactance Rate becomes XK2 (%) (less), enters steady operational status, can also constantly adjust like this reactive power that described Zhi Luxiang power circuit is carried.
Wherein, because described the first reactor L1 is short time duty, can, by very little its Capacity design, at least be less than the capacity of described the second reactor KM2, cost is very low for this reason.
For the reactance Rate XK2 (%) of described branch road, can determine according to the requirement of filtering, for example to weaken 5,7 subharmonic of three-phase electrical power system, can select XK2 (%)=6% left and right, weaken 3 subharmonic of Monophase electric power system, can select XK2 (%)=12% left and right.For many branch roads, different reactance Rate also can be set, with the different times harmonics of filtering.
As shown in Figure 2, be the structural representation that three described branch roads are applied to three-phase power circuit.Wherein said the first K switch M1 or described second switch KM2 are respectively coaxial threephase switch, and the tail end 0 of three described branch roads links together, and one end is connected on respectively in A phase, B phase and the C phase circuit of power circuit in addition.
The present invention is not only confined to above-mentioned embodiment; persons skilled in the art are according to content disclosed by the invention; can adopt other multiple embodiment to implement 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 protection of the invention.
Claims (8)
1. an operation/cutting method for the reactive power compensation based on two-stage inductance and power filter device, wherein said reactive power compensation and power filter device comprise Reactor banks, described Reactor banks is at least composed in series by the first reactor and the second reactor; Also comprise filtering capacitor, described Reactor banks and filtering capacitor are connected in series composition LC reactive power compensation and electric filtering branch road, and described branch road is connected with power circuit by the first switch; One end of described the first switch connects power circuit, and the other end connects described the first reactor; It is characterized in that, also comprise that side is connected on the second switch on described the first reactor and described the first switch, a tip node of described second switch is directly connected to power circuit, and the other end is connected between described the first reactor and described the second reactor; While dropping into described branch road, first closed described the first switch make described branch road be connected to power circuit and described second switch in off-state; The operating current of described branch road is after time delay buffering, closed described second switch makes two terminal shortcircuits of described the first reactor, after time delay buffering, cut off described the first switch again, described the first reactor is exited from described branch road, and described branch road becomes by connect with filtering capacitor formed lc circuit enter stable reactive power compensation state of described the second reactor.
2. reactive power compensation based on two-stage inductance according to claim 1 and the operation/cutting method of power filter device, it is characterized in that, in the time cutting off described branch road, first closed described the first switch, the operating current of described branch road cuts off described second switch after time delay buffering again devotes oneself to work described the first reactor, after time delay buffering, cut off described the first switch again, make described branch road depart from power circuit completely.
3. the reactive power compensation based on two-stage inductance and the power filter device that are applied to method described in claim 1 or 2, comprise Reactor banks, and described Reactor banks is at least composed in series by the first reactor and the second reactor; Also comprise filtering capacitor, described Reactor banks and filtering capacitor are connected in series LC reactive power compensation and the electric filtering branch road of composition, and described branch road is connected with power circuit by the first switch; One end of described the first switch connects power circuit, and the other end connects described the first reactor; It is characterized in that, also comprise that side is connected on the second switch on described the first reactor and described the first switch, a tip node of described second switch is directly connected to power circuit, and the other end is connected between described the first reactor and described the second reactor.
4. reactive power compensation and the power filter device based on two-stage inductance according to claim 3, is characterized in that, the capacity of described the first reactor is less than the capacity of described the second reactor.
5. reactive power compensation and the power filter device based on two-stage inductance according to claim 3, is characterized in that, described the first reactor and described the second reactor coaxially arrange.
6. reactive power compensation and the power filter device based on two-stage inductance according to claim 3, is characterized in that, the two ends of described capacitor are parallel with discharge coil.
7. according to the reactive power compensation based on two-stage inductance and power filter device described in claim 3,4,5 or 6, it is characterized in that, described branch road is three, and one end of three described branch roads links together and the other end is connected to respectively in three phase lines of power circuit.
8. reactive power compensation and the power filter device based on two-stage inductance according to claim 7, it is characterized in that, also comprise power factor controller, described power factor controller is detecting the first switch and the action of described second switch described in the rear drive of reactive power compensation signal.
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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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| CN102624009B true CN102624009B (en) | 2014-11-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| US7920392B2 (en) * | 2007-05-11 | 2011-04-05 | Soft Switching Technologies Corporation | Dynamic voltage sag correction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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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. |