CN202068183U - Arc suppression coil compensating system - Google Patents

Abstract

The utility model provides an arc suppression coil compensating system. The arc suppression coil compensating system includes an automatically compensational arc suppression coil device in a transformer substation, a fixed arc suppression coil device in a looped network station and a host machine. The automatically compensational arc suppression coil device and the fixed arc suppression coil device compensate capacitance current of a system together. A compensational current value of the automatically compensational arc suppression coil device can be regulated while a compensational current value of the fixed arc suppression coil device is fixed. The host machine is used to monitor the capacitance current of the system in real time and send instruction of regulating the compensational current value to the automatically compensational arc suppression coil device according to a size of the capacitance current, so as to make the sum of the compensational current value of the automatically compensational arc suppression coil device and the compensational current value of fixed arc suppression coil device to be equivalent to the capacitance current of the system.

Description

A kind of arc suppression coil compensation system

Technical field

The utility model relates to field of distribution network, relates in particular to a kind of arc suppression coil compensation system.

Background technology

Be unidirectional earth fault about 80% in the distribution network failure, in order to improve the reliability of power supply, the power distribution network great majority all adopt the mode of grounding through arc.Along with a large amount of uses of cable in recent years, electric power system faces the problem of arc suppression coil compensation off-capacity day by day.When the arc suppression coil capacity of installing when an electric substation can not satisfy the needs of system capacitive current increase, the common solution of prior art is the bigger arc suppression coil of replacing capacity, though this method can temporarily solve the problem of arc suppression coil compensation off-capacity, but extensibility is not good, after the arc suppression coil capacity increased to a certain degree, this method was difficult to carry out.In addition, the equipment that changes is difficult for handling, thereby causes the waste of resource.Moreover the common volume of the arc suppression coil that capacity comes more is big more, because the restriction of factors such as civil engineering and place, it also is unallowed unrestrictedly changing the bigger arc suppression coil of volume.

The utility model content

The purpose of this utility model is to provide a kind of arc suppression coil compensation system, and easily the resolution system capacitance current constantly increases the problem of the arc suppression coil compensation deficiency of appearance.

For achieving the above object, the utility model provides a kind of arc suppression coil compensation system, comprises the automatic compensation type arc suppression coil equipment that is arranged in transformer station, fixed arc suppression coil equipment and the main control system that is arranged in the looped network station;

Described automatic compensation type arc suppression coil equipment and fixed arc suppression coil equipment compensate the capacitance current of system jointly, the compensation current of described automatic compensation type arc suppression coil equipment can be regulated, and the compensation current of described fixed arc suppression coil equipment immobilizes;

Described main control system is used for the capacitance current of real-time monitoring system, and send the instruction of regulating its compensation current to automatic compensation type arc suppression coil equipment according to the size of capacitance current, so that the capacitance current of the compensation current sum of the compensation current of automatic compensation type arc suppression coil equipment and fixed arc suppression coil equipment and system is suitable.

Preferably, the compensation current of the fixed arc suppression coil of the fixed arc suppression coil equipment in each looped network station is all less than the capacitance current sum of this looped network station institute on-load.

Preferably, the damping resistance behind each fixed arc suppression coil equipment is by short circuit.

Preferably, described automatic compensation type arc suppression coil equipment is the adjustable arc suppression coil equipment of coil turn.

The mode that the arc suppression coil compensation system that provides by the utility model adopts centralized compensation and distribution compensation to combine, easily the resolution system capacitance current constantly increases the problem of the arc suppression coil compensation deficiency that causes, when the capacitance current increase of system causes the problem of existing systems compensation capacity deficiency, the quantity that only need suitably increase fixed arc suppression coil equipment just can adapt to new demand, avoided needing to change arc suppression coil equipment in the prior art and caused the investment that increases progressively, the equipment of also having avoided being replaced has been saved considerable cost of equipment by idle waste.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the system state diagram of many arc suppression coil equipment on-line executes in the arc suppression coil compensation system among the utility model embodiment;

Fig. 2 is the zero sequence loop schematic diagram of arc suppression coil compensation system;

Fig. 3 is the simple equivalent circuit figure in the zero sequence loop shown in Fig. 2;

Fig. 4 is the equivalent circuit diagram of Fig. 3;

Fig. 5 is the equivalent Dai Weinan circuit diagram of part in the frame of broken lines in the circuit diagram among Fig. 3;

Fig. 6 is the phasor diagram of the neutral point current of main arc suppression coil equipment L.

Embodiment

For the purpose, technical scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.

Automatic compensation type arc suppression coil equipment is installed by the arc suppression coil compensation system that provides in the utility model in transformer station, can guarantee that its capacity is at least at more than 50% of system capacitive current, the automatic compensation type arc suppression coil equipment that is arranged in transformer station carries out centralized compensation as main extinguishing arc equipment to system capacitive current.Install and fix formula arc suppression coil equipment in the looped network station, the fixed arc suppression coil equipment in all looped network stations is as from extinguishing arc equipment, to the system capacitive current compensation that distributes.

The compensation current of automatic compensation type arc suppression coil equipment can be regulated, and the compensation current of fixed arc suppression coil equipment immobilizes.Can select the fixed arc suppression coil equipment of capacity suitable according to the capacitance current distribution situation of location, looped network station.

The utility model combines the centralized compensation of automatic compensation type arc suppression coil equipment with the distribution compensation of many fixed arc suppression coil equipment, its principle and arc suppression coil equipment unit operation are similar, and total compensation current of all arc suppression coil equipment is the compensation current sum of whole arc suppression coil equipment.By the fixed arc suppression coil of parallel connection, no matter how much quantity of fixed arc suppression coil is, as long as the equivalent capacitance of the total capacity of arc suppression coil equipment and system coupling.

Main control system is used for the capacitance current of real-time monitoring system, and send the instruction of regulating its compensation current to automatic compensation type arc suppression coil equipment according to the size of capacitance current, so that the capacitance current of the compensation current sum of the compensation current of automatic compensation type arc suppression coil equipment and fixed arc suppression coil equipment and system is suitable.In the utility model, the fixed arc suppression coil equipment in the looped network station is responsible for the capacitance current of this station subordinate's circuit is compensated, and the automatic compensation type arc suppression coil equipment in the transformer station is responsible for remaining capacitance current in the bucking-out system.Because fixed arc suppression coil equipment is once deployment, its compensation current is exactly constant, and the compensation current of automatic compensation type arc suppression coil equipment can be adjusted flexibly according to the variation of system capacitive current, like this by automatic compensation type arc suppression coil equipment to the automatic adjustment that its capacitance current carries out, make whole arc suppression coil compensation system works under the state of automatic tuning.

Need to prove, in order to increase the flexibility of system deployment, also can select for use unit to have the fixed arc suppression coil equipment of different gears, this fixed arc suppression coil equipment can be by artificial its compensation current of adjusting before work, but still can to adjust its compensation current automatically in the course of the work with automatic compensation type arc suppression coil equipment be different for this.

Below the concrete working method of detailed arc suppression coil compensation system.

Fig. 1 shows the system state diagram of many arc suppression coil equipment on-line executes in the arc suppression coil compensation system in the utility model.Wherein, GRID represents electrical network, can not need to consider its concrete structure and inner annexation in the utility model embodiment with it as black box for processing.L is the automatic compensation type arc suppression coil equipment that is arranged in the transformer station, and it is as main arc suppression coil equipment; L ₁～L _nBe fixed arc suppression coil equipment, its conduct is from arc suppression coil equipment.The circuit at main arc suppression coil equipment place has damping resistance R, can change reactance value; Be not with damping resistance from the circuit at arc suppression coil equipment place, can not change reactance value.By changing the inductance value of main arc suppression coil equipment L, main control system collects the electric parameters of system, and then the capacitance current of computing system.Following labor Calculation Method.

After each bus connection switch closure, the zero sequence loop schematic diagram of system as shown in Figure 2, U wherein _o', U _O1', U _O2' ... U _On' be respectively the unbalance voltage of the extinguishing arc branch road at each arc suppression coil equipment place, C _sBe the total direct-to-ground capacitance of system.In the arc suppression coil compensation system of paired running, owing to be fixed arc suppression coil equipment from arc suppression coil equipment, its inductance value remains unchanged.Fig. 3 is the simple equivalent circuit figure in the zero sequence loop shown in Fig. 2, and Fig. 4 is the equivalent circuit diagram of Fig. 3.

Utilize the equivalent Dai Weinan circuit of Thevenin's theorem shown in the part in the frame of broken lines among Fig. 3 can being converted in Fig. 5 frame of broken lines, be converted into connecting of power supply and impedance.Wherein, Zp=jXCs//jXLp ', in the drawings, Z _pStill be labeled as Z.XC _sThe capacitive reactance of expression system capacitance, XL _p' expression is respectively from the induction reactance in parallel of arc suppression coil equipment.So satisfy relation of plane down:

$Z_P=R_P-j{X}_P=-\mathrm{jXCs}//\mathrm{jXL}{p}^{\′}=\frac{-\mathrm{jXCs}\·\mathrm{jXL}{p}^{\′}}{j(\mathrm{XL}{p}^{\′}-\mathrm{XCs})}$

(formula 1)

$=-j\frac{\mathrm{XCs}\·\mathrm{XL}{p}^{\′}}{(\mathrm{XL}{p}^{\′}-\mathrm{XCs})}$

So can obtain:

R _P=0 (formula 2)

$X_P=\frac{\mathrm{XCs}\·\mathrm{XL}{p}^{\′}}{(\mathrm{XL}{p}^{\′}-\mathrm{XCs})}$

(formula 3)

In the formula, XLp '=XL ₁// ... //XLi//... //XLn.

Can obtain the expression formula of the voltage phasor in the loop by Fig. 3:

${\stackrel{\·}{U}}_0=\stackrel{\·}{I}[R+j(X_L-X_P)]$

(formula 4)

When calculating capacitance current, change the reactance amount of main arc suppression coil equipment L, find the solution capacitive earth current according to the neutral point current amplitude of main arc suppression coil equipment L and the variation of phase angle, its phasor diagram is referring to Fig. 6.In Fig. 6, R represents the all-in resistance (because the all-in resistance resistance in this loop is approximately equal to the damping resistance resistance of main arc suppression coil equipment, so be designated as R equally) in the loop, XL ₁Represent the reactance before main arc suppression coil equipment is transferred the files, XL ₂Represent the reactance after main arc suppression coil equipment is transferred the files; X _PThe absolute value of representing part capacitive reactance in parallel; U ₀It is the thevenin equivalent circuit power supply; I ₁₁Be main arc suppression coil equipment mid point electric current before transferring the files, I ₁₂It is the main arc suppression coil equipment mid point electric current in back of transferring the files; θ is the phase angle difference of front and back electric current for a change.

Can list a linear equation in two unknowns group according to phasor diagram 5:

$\left\{\begin{array}{c}{I}_{11}(X_{L1}-X_P)=I_{11}R\·\mathrm{tg\θ}+I_{12}(X_{L2}-X_P)\·\sec \mathrm{\θ}\\ I_{12}R=I_{11}R\·\sec \mathrm{\θ}+I_{12}(X_{L2}-X_P)\·\mathrm{tg\θ}\end{array}\right.$

(formula 5)

Find the solution above-mentioned equation group, can obtain R and X _P:

$R=\frac{I_{11}{I}_{12}(X_{L1}-X_{L2})\·\sin \mathrm{\θ}\·\cos \mathrm{\θ}}{(I_{11}\·\cos \mathrm{\θ}-I_{12})(I_{12}\·\cos \mathrm{\θ}-I_{11})-I_{11}{I}_{12}\·{\sin }^2\mathrm{\θ}}$

(formula 6)

$X_P=\frac{(I_{11}{\mathrm{<figure-callout\; id="1"\; label="X\; L"\; filenames="DEST\_PATH\_HDA0000071543200000032.png"\; state="\{\{state\}\}">X</figure-callout>}}_L\&CenterDot;\cos \mathrm{\&theta;}-I_{12}{X}_{L2})(I_{12}\&CenterDot;\cos \mathrm{\&theta;}-I_{11})-I_{11}{I}_{12}\&CenterDot;{\sin }^2\mathrm{\&theta;}\&CenterDot;X_{L2}}{(I_{11}\&CenterDot;\cos \mathrm{\&theta;}-I_{12})(I_{12}\&CenterDot;\cos \mathrm{\&theta;}-I_{11})-I_{11}{I}_{12}\&CenterDot;{\sin }^2\mathrm{\&theta;}}$

(formula 7)

Can get by formula (3) and formula (7):

$\frac{\mathrm{XCs}\&CenterDot;\mathrm{XL}{p}^{\&prime;}}{(\mathrm{XL}{p}^{\&prime;}-\mathrm{XCs})}=\frac{(I_{11}{\mathrm{<figure-callout\; id="1"\; label="X\; L"\; filenames="DEST\_PATH\_HDA0000071543200000032.png"\; state="\{\{state\}\}">X</figure-callout>}}_L\&CenterDot;\cos \mathrm{\&theta;}-I_{12}{X}_{L2})(I_{12}\&CenterDot;\cos \mathrm{\&theta;}-I_{11})-I_{11}{I}_{12}\&CenterDot;{\sin }^2\mathrm{\&theta;}\&CenterDot;X_{L2}}{(I_{11}\&CenterDot;\cos \mathrm{\&theta;}-I_{12})(I_{12}\&CenterDot;\cos \mathrm{\&theta;}-I_{11})-I_{11}{I}_{12}\&CenterDot;{\sin }^2\mathrm{\&theta;}}$

(formula 8)

Owing to have only XC in the equation of above-mentioned formula 8 _sBe unknown quantity, can obtain XC so find the solution above-mentioned quadratic equation with one unknown _s

Can pass through the capacitance current of following formula computing system at last:

$I_C=\frac{\mathrm{U\&phi;}}{{\mathrm{XC}}_S}$

(formula 9)

To sum up, can realize the calculating of system capacitive current under many arc suppression coil equipment on-line execute situations, and realize the compensation of system failure electric current by the compensation current gear of regulating main arc suppression coil equipment.

Preferably, the compensation current of the fixed arc suppression coil of the arc suppression coil equipment in each looped network station is all less than the capacitance current sum of this looped network station institute on-load, can be responsible for the remaining capacitance current of bucking-out system by the automatic compensation type arc suppression coil of higher level transformer station like this, the advantage of performance automatic tuning arc depression coil helps the automatic distribution of system balance capacity.If fixedly arc suppression coil overcompensation operation, then may be under a certain operational mode, the capacity of the fixed arc suppression coil equipment in each looped network station of the subordinate of transformer station is all above capacitance current, add the automatic compensation type arc suppression coil equipment that transformer station itself installs, make the capacity of entire system compensation substantially exceed system capacitive current, cause serious mistake not long, may influence the effect of whole bucking-out system, can't bring into play the advantage of compensation of ground system.

In addition, damping resistance behind the fixed arc suppression coil equipment can be by short circuit, because automatic compensation type arc suppression coil equipment below still is connected to damping resistance, and also there is certain damping in system itself, so still there is bigger damping resistance in the zero sequence loop, take off humorous degree and maintain higher level yet, therefore fixed arc suppression coil place neutral point can not produce too high voltage yet.So also can guarantee computing function and computational accuracy.

In practice, the automatic compensation type arc suppression coil equipment that is deployed in the transformer station can adopt the adjustable arc suppression coil equipment of coil turn, is the compensation current of this equipment of scalable by the coil turn of regulating this equipment.

The arc suppression coil compensation system that the utility model provides can the resolution system capacitance current constantly increases the problem of the arc suppression coil compensation deficiency of appearance, and actual product operation long-play is in good condition.Because whole bucking-out system adopts centralized compensation and the mode of the compensation combination that distributes, and does not allow to be subject to the place restriction so equipment is installed.

When the capacitance current increase of system causes the problem of existing systems compensation capacity deficiency, the quantity that only need suitably increase fixed arc suppression coil equipment just can adapt to new demand, avoided needing to change arc suppression coil equipment in the prior art and caused the investment that increases progressively, the idleness of equipment of also having avoided being replaced is wasted, and has saved considerable cost of equipment.

In addition, when the arc suppression coil compensation system decomposition in the utility model is become several sections, also can in subrange, keep roughly reasonably compensation, because each equipment is standby each other, when individual other arc suppression coil equipment withdraws from, influence to entire system is little, and this can reduce the operation and maintenance cost of equipment to a certain extent.

Owing to adopted the mode of the compensation that distributes, so that it goes without doing is very big for the capacity of separate unit arc suppression coil equipment, help the long-term stability operation of equipment, reduced breakdown rate, improved the fail safe and the reliability of equipment operation, avoided because the extra charge expenditure that unnecessary maintenance causes.

The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.

Claims (4)

1. an arc suppression coil compensation system is characterized in that, comprises the automatic compensation type arc suppression coil equipment that is arranged in transformer station, fixed arc suppression coil equipment and the main control system that is arranged in the looped network station;

Described automatic compensation type arc suppression coil equipment and fixed arc suppression coil equipment compensate the capacitance current of system jointly, the compensation current of described automatic compensation type arc suppression coil equipment can be regulated, and the compensation current of described fixed arc suppression coil equipment immobilizes;

Described main control system is used for the capacitance current of real-time monitoring system, and send the instruction of regulating its compensation current to automatic compensation type arc suppression coil equipment according to the size of capacitance current, so that the capacitance current of the compensation current sum of the compensation current of automatic compensation type arc suppression coil equipment and fixed arc suppression coil equipment and system is suitable.

2. arc suppression coil compensation according to claim 1 system is characterized in that, the compensation current of the fixed arc suppression coil of the fixed arc suppression coil equipment in each looped network station is all less than the capacitance current sum of this looped network station institute on-load.

3. arc suppression coil compensation according to claim 1 system is characterized in that the damping resistance behind each fixed arc suppression coil equipment is by short circuit.

4. according to any described arc suppression coil compensation system in the claim 1 to 3, it is characterized in that described automatic compensation type arc suppression coil equipment is the adjustable arc suppression coil equipment of coil turn.

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