CN201142578Y - Reactive compensator with harmonic suppression function - Google Patents

Abstract

A reactive power compensation device with the harmonic inhibition function relates to an improvement on a reactive power compensation device in a power grid of aluminum industrial enterprises. The reactive power compensation device is characterized in that the reactive power compensation device comprises capacitors, a reactor and a zero-sequence current transformer; the capacitors are connected into the binary star-shaped wire connection, the zero-sequence current transformer is additionally arranged between the two groups of star-shaped capacitors, and the 6 percent reactor is connected at the front ends of the groups of the capacitors. The usage of the technical proposal of the utility model can reduce the loss of a power compensation system, have low failure rate, and achieve the effects of energy conservation and loss reduction.

Description

A kind of have an inhibiting reactive power compensator of harmonic wave

Technical field

A kind of have an inhibiting reactive power compensator of harmonic wave, relates to a kind of improvement of carrying out at the reactive power compensator in the aluminium industrial enterprise electrical network.

Background technology

Whether the power system reactive power trend distributes reasonable, not only is related to the quality of electric power quality, but also directly influences the fail safe and the economy of electrical network self-operating.This seems same important in power distribution network.If reactive generation capacity deficiency, system's working voltage will be difficult to guarantee.Because the increase of net capacity requires also to increase with day to electric network reactive-load, in addition, the power factor of distribution network and the reduction of voltage will make electric equipment be not fully utilized, and reduce the distribution network transmittability, and cause that loss increases.Therefore, resolve the problem of distribution network reactive power compensation, the fail safe and the wastage reducing and energy saving of electrical network had great significance.

The existing reactive power compensator (extensively adopting power capacitor) that uses in the alumina industry electric power system in the 10kv field, though can reach the effect of compensation power factor to a certain extent, but equipment failure rate height, very easily cause system blackout and voltage fluctuation, once caused bigger economic loss to production.

In addition, harmonic wave is comparatively serious in the 10KV of alumina producing electric power system, and the characteristics of self are also arranged simultaneously, and for nth harmonic, the reactance of capacitor will be the 1/n of first-harmonic, and therefore, this electric current of harmonic wave is very harmful to capacitor.

At present, the capacitor group of using in alumina producing is to adopt the △ tie lines, though the capacitor of shunt compensation adopts the △ tie lines can reduce shoving and reduce switching overvoltage when dropping into the capacitor group in the electric power system, but less electric substation and the distribution line of capacity of short circuit just adopts this mode usually, and capacitor is when adopting the △ tie lines, during arbitrary capacitor breakdown short circuit, the line to line fault of three-phase line will be caused, short circuit current is very big, might cause the capacitor blast, this is to the high-voltage capacitor special hazard.

Summary of the invention

The purpose of this utility model is exactly the deficiency that exists at above-mentioned prior art, provide that a kind of loss is low, failure rate is low,, configuration reasonably has the inhibiting reactive power compensator of harmonic wave

The purpose of this utility model is achieved through the following technical solutions.

A kind of have an inhibiting reactive power compensator of harmonic wave, it is characterized in that it comprises capacitor, reactor and zero sequence current mutual inductor, its capacitor (is connected into the dual star topology wiring, and installs zero sequence current mutual inductor additional between two groups of star-like capacitors, and be connected in series 6% reactor at capacitor group front end.

At present, alumina producing enterprise high-voltage capacitor group major part commonly used is the △ tie lines, though shoving and reduce switching overvoltage when adopting this tie lines to reduce to drop into the capacitor group, less electric substation and the distribution line of capacity of short circuit just adopts this mode usually.And capacitor is when adopting the △ tie lines, during arbitrary capacitor breakdown short circuit, the line to line fault of three-phase line will be caused, short circuit current is very big, might cause the capacitor blast, this is to the high-voltage capacitor special hazard, and for pursuing stable electric power system, the △ tie lines is a no small factor leading to social instability really.At this point, the utility model is transformed into the capacitor group dual star topology (Y type) tie lines of isolated neutral, this tie lines relatively is fit to the moderate or bigger medium voltage network of capacity, and can stop the generation of capacitor explosion accident from technical standpoint to a great extent.

In the system of harmonic background is arranged, the capacitor group that is used for power factor compensation should select suitable tuning reactor to connect with compensation condenser, to prevent that compensation condenser and power network from forming serial or parallel connection resonance, to such an extent as to the aberration rate of voltage and electric current is even more serious, cause the compensation condenser overvoltage, then cause the capacitor insulation degradation failure, also may cause other serious electric accidents.

At the characteristics of harmonic wave in the 10KV of the aluminum oxide industry enterprise electrical network, according to formula:

By $2\mathrm{\πfL}=\frac{1}{2\mathrm{\πfC}}$ :

$f_0=\frac{1}{2\mathrm{\π}\sqrt{\mathrm{LC}}}$

Based on third harmonic, should go here and there 12.6% reactor as the system background harmonic wave, resonance point is 141HZ (can avoid the resonance greater than third harmonic 150HZ)

Based on quintuple harmonics, should go here and there 6% reactor as the system background harmonic wave, resonance point is 204HZ (can avoid the resonance greater than quintuple harmonics 250HZ)

Go here and there 1% reactor, can only play the effect of shoving of suppressing, and can not avoid issuable resonance.

According to the experience of electrical network parameter being considered and actual test (5 times, 7 subharmonic seriously polluted) that the utility model selects string 6% reactor can make bucking-out system long-term safety, operation reliably, and absorbs the harmonic wave of 15%-50%.The selecting tuning reactor is connected with compensation condenser on every branch road, can prevent effectively that also compensation condenser and power network from forming serial or parallel connection resonance, can eliminate the high-voltage capacitor group when combined floodgate is incorporated into the power networks, because of inrush phenomenon very big, understanding the arc light problem that occurs on the switch or on the current transformer, these safe operations for capacitor all are very favorable.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

A kind of have an inhibiting reactive power compensator of harmonic wave, and it comprises capacitor 2, reactor 1 and zero sequence current mutual inductor 3.Its design feature is that capacitor 2 is connected into the dual star topology wiring, and two groups of 2 in star-like capacitors install zero sequence current mutual inductor 3 additional, and is connected in series 6% reactor 1 at capacitor group front end.

Embodiment

1, adopts the TILP567Kvar/7300V type three-phase high-voltage electric power capacitor of Nokia Telecommunications's production of international endorsement, this capacitor has low, the lightweight characteristics of consume, according to needed condenser capacity, every branch road only need be installed 6 capacitors and can satisfy power back-off needs (originally the branch road of capacity minimum also needs 81).

2, at the bigger present situation of harmonic component in the 10KV of the aluminum aluminum oxide manufacturing enterprise electrical network, according to measurement data to harmonic content, select string 6% reactor so that the bucking-out system long-term safety, operation reliably, and the harmonic wave of absorption 15%-50%, on every branch road, select XKIB2500/10.5/6-50 type tuning reactor to connect with compensation condenser, can prevent effectively that compensation condenser and power network from forming serial or parallel connection resonance, to such an extent as to the aberration rate of voltage and electric current is even more serious, cause the compensation condenser overvoltage, then cause the capacitor insulation degradation failure, even cause other serious electric accidents.

3, the original whole △ tie lines of high-voltage capacitor group easily cause the line to line fault of three-phase line, cause the present situation of capacitor blast.Improved capacitor group adopts double star (Y type) tie lines of isolated neutral.

4, at the present situation of producing line voltage higher when the highest (reach 11KV), the novel capacitor voltage withstand class of employing is selected for use and is 12KV.

The wiring explanation, the concrete mode of connection is for dividing reactor L the three-phase A of connecting system respectively, B, C three-phase; The power capacitor three-phase respectively and connect (adds zero sequence current mutual inductor) behind the secondary neutral short circuit in the shorting stub, once be connected in series with reactor again.

After adopting the technical solution of the utility model, electric power compensation system loss reduction, fault be low, reached energy-saving and cost-reducing effect.

Claims (1)

1. one kind has the inhibiting reactive power compensator of harmonic wave, it is characterized in that it comprises capacitor, reactor and zero sequence current mutual inductor, its capacitor is connected into the dual star topology wiring, and installs zero sequence current mutual inductor additional between two groups of star-like capacitors, and is connected in series 6% reactor at capacitor group front end.

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