CN103311041A - Switching control method of VVVE permanent-magnet vacuum circuit breaker - Google Patents

Abstract

The invention relates to an optimizing method for the switching control of a permanent-magnet vacuum circuit breaker, and the adjustment for the dynamic switching characteristics of the circuit breaker is realized by the method by enabling coil current to follow an optimized current curve. The coarse adjustment and the fine adjustment for the switching time are realized through VVVE, so that the action time of the circuit breaker is constant under different working conditions. The method can be used for compensating the switching time of the circuit breaker on line, so that both the separating time and the switching time of the circuit breaker can be kept stable under different working conditions, so as to provide a reliable basis for realizing synchronous switching.

Description

VVVE permanent magnetism vacuum circuit-breaker combined floodgate control method

Technical field

The present invention relates to the control technology of vacuum circuit-breaker permanent magnet mechanism, particularly relate to VVVE permanent magnetism vacuum circuit-breaker combined floodgate control method.

Background technology

At present, the control method of permanent magnetism vacuum circuit-breaker is generally in the majority with open loop control, and namely in the breaking-closing operating process of reality, controller is when carrying out the divide-shut brake order, and the implementation of not sense command is not accepted the feedback states from the outside.Under this method, the time of divide-shut brake is subject to storage capacitor and the unsettled influence of electric capacity initial voltage, makes the branch wire time of circuit breaker bigger fluctuation occur.Because under the open loop, the moving contact state of uncontrollable circuit breaker, in higher operating voltage, mechanism's bite or order by wrong the execution (closing position closes a floodgate, separating brake position separating brake), easily because of by the excessive coil burnout that causes permanent magnet mechanism of the electric current of coil.And realize that under higher operation voltage breaking-closing operating can make movement velocity unshakable in one's determination increase, thus make contact bear bigger impulsive force, reduce mechanism useful life, and may make moving contact that repeatedly spring takes place, influence is closed and is closed reliability.For improving the kinetic characteristic of moving contact, patent " permanent magnetism vacuum circuit-breaker control method and device based on coil current are realized " provides the control of a kind of control strategy realization of applied current closed loop to vacuum circuit-breaker, improved the kinetic characteristic of moving contact, and guaranteed under same temperature, the closing time of circuit breaker has reached ± 0.3ms the closing time dispersiveness under the same temperature not with the influence of electric capacity initial voltage and capacitance.Yet this method do not consider because of the influence of variations in temperature to the breaker mechanical structure, thereby causes closing time to change, and the acquisition methods of the reference curve that provides needs to change continuously the electric capacity of different capabilities, brings inconvenience for actual the use.Because selected curve fixes, be difficult to realize the adjusting to the breaker closing time.Therefore need a kind of effective method, the closing time of circuit breaker is carried out online compensation, so that the closing time of circuit breaker can both keep under different operating modes is stable, thereby for realizing that synchroswitching provides reliable basis.

Summary of the invention

At above the deficiencies in the prior art, the invention provides a kind of VVVE permanent magnetism vacuum circuit-breaker combined floodgate control method.So that the branch wire time of circuit breaker can both keep under different operating modes is stable, for realizing that synchroswitching provides reliable basis.

Purpose of the present invention is achieved through the following technical solutions:

The optimization method that a kind of permanent magnetism vacuum circuit-breaker closes a floodgate and controls, this method realizes the adjustment to the breaker closing dynamic characteristic by making the current curve after coil current is followed optimization.By coarse adjustment and the fine setting of VVVE realization to closing time, make circuit breaker constant following operate time in different operating mode.It is characterized in that this control method comprises:

1) according to the closing coil electric current of known permanent magnetism vacuum circuit-breaker, determines the initiating moment t of vacuum circuit-breaker moving contact ₁, just the conjunction t _a, and the current value I of vacuum circuit-breaker moving contact initiating moment coil ₁, coil is at the timeconstant of separating brake position ₁Timeconstant with closing position ₂, and calculate literary composition and plant described parameter S;

2) according to aforementioned parameters, determine the parameter of VVVE match current equation, thereby draw VVVE reference current curve;

3) by constantly regulating t ₁And S, recomputate match current equation parameter, the reference current curve that obtains revising, use the described coil current tracing of patent " vacuum circuit-breaker control method and device based on coil current are realized ", realization is to coarse adjustment and the fine setting of breaker closing time, to optimize the moving contact of breaker kinetic characteristic and to guarantee the consistency of closing time.

The equation of coil current during given the combined floodgate: $i\left(t\right)=\left\{\begin{array}{cc}{i}_1\left(t\right)& t\&le;t_1\\ i_2\left(t\right)& t_1<t\&le;t_a\\ i_3\left(t\right)& t\&GreaterEqual;t_a\end{array}\right.$

Wherein:

$i_1\left(t\right)=I_0(1-e^{-t/{\mathrm{\&tau;}}_1})$

i ₂(t)=A(t-B) ²+C

$i_3\left(t\right)=I_a{e}^{-(t-t_a)/{\mathrm{\&tau;}}_2}+I_x[1-e^{-(t-t_a)/{\mathrm{\&tau;}}_2}].$

The invention has the advantages that:

Can the closing time of circuit breaker be compensated, so that the branch wire time of circuit breaker can both keep under different operating modes is stable, thereby for realizing that synchroswitching provides reliable basis.

Description of drawings

Fig. 1: permanent magnet mechanism coil drive current curve chart;

Fig. 2: when keeping E constant, current curve family;

Fig. 3: the reference curve family when parameter is adjusted again;

Fig. 4: 2500uF electric capacity, under the 205V initial voltage, 12kV monostable vacuum circuit-breaker combined floodgate characteristic;

Fig. 5: the moving contact kinetic characteristic contrast before and after electric current is optimized;

Fig. 6: change the influence of the closing time of S;

Fig. 7: the displacement curve of 35kV vacuum circuit-breaker when changing the S parameter;

Fig. 8: under the different temperatures, the displacement curve of moving contact during open loop;

Fig. 9: under the different temperatures, the displacement curve of moving contact when following same curve closed loop;

Figure 10: under the different temperatures, the displacement curve when changing the S parameter.

Embodiment

The equation form of 1 closing coil electric current

Coil current for a change at first should obtain the citation form of current equation.Because the dynamic characteristic equation of permanent magnet mechanism is very complicated, if directly use dynamical equation analysis, is difficult to realize the change of electric current.For obtaining the citation form of coil current fast, obtain current curve, the breaker coil electric current of reality has been carried out match.Be example with the combined floodgate, the coil current waveform of permanent magnetism vacuum circuit-breaker is shown in 0.

In 0, t ₁Be the initiating moment of vacuum circuit-breaker moving contact, I ₁Be pick-up current; t _aBe the firm conjunction of moving contact, I _aFor just closing electric current; t ₂Be the moment that moving contact is finished the excess of stroke, I ₂The electric current of coil when finishing the excess of stroke, t ₃Be the moment that the order of closing a floodgate finishes, I ₃The electric current of inscribing during for this.

By to the dynamic analysis of permanent magnet mechanism as can be known at t ₁Constantly and t ₂-t ₃In the stage, coil current increases with exponential form, and therefore, this two stage electric current can adopt the exponential function match; t ₁-t _aAnd t _a-t ₂Stage is because motion process is complicated, to simplify the analysis, the current equation in this stage used fitting of a polynomial.By to the switching current curve shape analysis of actual circuit breaker as can be known, this two stage uses quadratic function can meet the demands substantially.Therefore, the coil current equation of making process can be used formula (1) expression:

$i\left(t\right)=\left\{\begin{array}{cc}{i}_1\left(t\right)& t\&le;t_1\\ i_2\left(t\right)& t_1<t\&le;t_a\\ i_3\left(t\right)& t_a<t\&le;t_2\\ i_4\left(t\right)& t\&GreaterEqual;t_2\end{array}\right.---\left(1\right)$

Wherein:

$i_1\left(t\right)=I_0(1-e^{-t/{\mathrm{\&tau;}}_1})$

i ₂(t)=A(t-B) ²+C

i ₃(t)=at ²+bt+c

$i_4\left(t\right)=I_a{e}^{-(t-t_2)/{\mathrm{\&tau;}}_2}+I_x[1-e^{-(t-t_2)/{\mathrm{\&tau;}}_2}]$

Because at t _a-t ₂In the stage, dynamic/static contact contacts, and the grid side circuit is connected, after this as long as dynamic/static contact no longer separates then to the not influence of grid side circuit.In this stage, moving contact has been finished collision process, strengthens electric current this moment to the not influence of moving contact collision energy, is conducive at t simultaneously ₃Electric current constantly is increased to bigger value, makes moving contact that bigger electromagnetic force be arranged when finishing the excess of stroke, avoids closing rebound.Therefore, employed switching current reference curve does not comprise t _a-t ₂The equation in stage, as the formula (2):

$i\left(t\right)=\left\{\begin{array}{cc}{i}_1\left(t\right)& t\&le;t_1\\ i_2\left(t\right)& t_1<t\&le;t_a\\ i_3\left(t\right)& t\&GreaterEqual;t_a\end{array}\right.---\left(2\right)$

Wherein:

$i_1\left(t\right)=I_0(1-e^{-t/{\mathrm{\&tau;}}_1})$

i ₂(t)=A(t-B) ²+C

$i_3\left(t\right)=I_a{e}^{-(t-t_a)/{\mathrm{\&tau;}}_2}+I_x[1-e^{-(t-t_a)/{\mathrm{\&tau;}}_2}]$

The optimization of 2 electric currents and VVVE control method

The 1st joint has obtained the fit equation of electric current, and this section will analyze how to control the moving contact of breaker kinetic characteristic by setting different current curve parameter values, to reduce the whole time of divide-shut brake, controls the firm sum velocity of moving contact, and avoids occurring contact bounce.

2.1 phase I coil current equation parameter is set and is optimized

When using direct voltage source, the phase I current equation is the nought state equation of firstorder circuit, that is:

$i\left(t\right)=I_0(1-e^{-t/{\mathrm{\&tau;}}_1})=\frac{U_0}{R}(1-e^{-\mathrm{Rt}/L_1})---\left(3\right)$

U in the formula ₀Be direct voltage, R is coil resistance, L ₁Be phase I coil equivalent inductance.For the control system of using electric capacity as the control source, because the time of phase I is shorter, therefore and the capacity of storage capacitor is bigger usually, should stage electric capacity can be similar to regard direct voltage source as, thereby above-mentioned solution form is equally applicable to electric capacity as the system in control source.In this stage, the integrated operation time of the rise time of coil current to divide-shut brake has considerable influence.

Reduce 0-t ₁The time in stage, can reduce pick-up current I ₁Because the electromagnetic force of electromagnet is directly proportional with electric current I and the turn number N of flowing through coil, improves coil turn and can improve electromagnetic force, thereby make current critical value I ₁Reduce, but increasing coil turn can make the inductance of coil increase sharply, and is unfavorable for 0-t ₁The electric current fast rise in stage.This shows that coil turn is unsuitable excessive, this has just determined electric current I ₁Can not unrestrictedly reduce.On the other hand, for specific mechanism, R and L ₁Value determined and pick-up current I ₁Determine, by formula (3) as can be known, reduce electric current and rise to I ₁Time, can only improve the initial voltage U of electric capacity ₀At this moment, the multiple that makes capacitance voltage improve is α, time t on the electric current of phase I after then voltage improves ₁' be:

$t_1^{\&prime;}=-{\mathrm{\&tau;}}_1\ln (1-\frac{1}{\mathrm{\&alpha;}}(1-e^{-\frac{t_1}{{\mathrm{\&tau;}}_1}}))---\left(4\right)$

By the match to the current known curve phase I, can determine timeconstant ₁, I ₀And initiating moment t ₁Relevant parameter is brought into after formula (4) can calculate capacitance voltage and change, and the phase I electric current rises to the time of pick-up current, thereby provides reference for reducing closing time.Formula (5) has further provided the requirement that changes after the rise time the electric capacity initial voltage:

$\mathrm{\&alpha;}=\frac{\mathrm{<figure-callout\; id="0"\; label="U\; U"\; filenames="DEST\_PATH\_HDA00003560681200013.png,DEST\_PATH\_HDA00003560681200021.png"\; state="\{\{state\}\}">U</figure-callout>}}{U_{}}=\frac{1-e^{-t_1/{\mathrm{\&tau;}}_1}}{1-e^{-t_1^{\&prime;}/{\mathrm{\&tau;}}_1}}---\left(5\right)$

Can be defined as making the time of phase I to be reduced to t by formula (5) ₁', the minimum multiple that the electric capacity initial voltage must improve than the initial voltage that obtains known curve is for the design of actual hardware system provides reference.Taking all factors into consideration (4), (5) two formulas, is principle to reduce closing time, and considers it to the requirement of hardware voltage, sets initiating t constantly ₁', make

$k=\frac{t_1^{\&prime;}}{t_1}---\left(6\right)$

Realization is to the optimization of phase I equation parameter.

2.2 second stage coil current equation parameter is set and is optimized

2.2.1 second stage coil current equation parameter is set principle

Moving contact is at t ₁-t _aStage is finished the motion process that arrives firm chalaza from initial position.In this stage; the desirable motion conditions of moving contact is to make the acceleration of motion at moving contact initial stage bigger; thereby reduce accelerator; slow down even slow down reaching the certain speed post acceleration; the restriction moving contact arrives the speed of firm chalaza; reducing the collision energy of moving contact, thereby closing time is reduced and protect moving contact.Realizing this situation, just must be that motion electric current in early stage increases fast, and motion later stage electric current descends rapidly.

In set electromagnetic mechanism,, therefore, do not considering under the magnetically saturated situation electromagnetic force F of permanent magnet mechanism output because turn number N is definite _eBe directly proportional with the current i by coil, because before the motion, moving contact speed is zero, therefore, equation group (7) is set up:

$\left\{\begin{array}{c}{F}_e\left(i\right)=\mathrm{\&lambda;i}\left(t\right)\\ F=F_e\left(i\right)-f\left(x\right)\\ i=i\left(t\right)\\ x=x\left(t\right)\\ {\&Integral;}_0^l\mathrm{Fdx}={\mathrm{<figure-callout\; id="2"\; label="mv\; t"\; filenames="DEST\_PATH\_HDA00003560681200013.png"\; state="\{\{state\}\}">mv</figure-callout>}}_t^{}/2\end{array}\right.---\left(7\right)$

X is the position quantity of moving contact in the formula, and l is clearance between open contacts, and f is that the suffered resistance of moving contact is made a concerted effort in the motion process.Last is conservation of energy formula in the equation group, because x (t ₁)=0, x (t _aLast can get formula (8) to)=l with preceding 4 formula substitutions:

${\&Integral;}_{t_1}^{t_a}i\left(t\right)x^{\&prime;}\left(t\right)\mathrm{dt}=E/\mathrm{\&lambda;}---\left(8\right)$

T in the formula ₁Be the moving contact initiating moment, t _aFor moving contact arrives the moment of just having closed the position, wherein:

$E={\&Integral;}_0^{l}f\left(x\right)\mathrm{dx}+\frac{{\mathrm{<figure-callout\; id="2"\; label="mv\; t"\; filenames="DEST\_PATH\_HDA00003560681200013.png"\; state="\{\{state\}\}">mv</figure-callout>}}_t^{}}{2}---\left(9\right)$

Under steady temperature, if do not consider mechanism aging to the resistance of motion and moving contact stroke change influence the time, it is constant that moving contact overcomes the acting of the resistance of motion.In addition, by the research of pertinent literature as can be known, when supply voltage be reduced to rated voltage 80% the time, the moving contact of breaker movement velocity descends less than 10%, when supply voltage was reduced to rated voltage 65%, speed descended less than 20%, and the velocity variable of visible moving contact is less.In motion process, moving contact overcomes resistance of motion acting much larger than the variation of self kinetic energy, can not consider that therefore the variation of moving contact kinetic energy to the influence of E, thinks that E is constant.

The current equation of formula (8) has been described the function balance process from the angle of macroscopic view acting, the moving contact motion process is not carried out concrete force analysis, therefore can not determine actual displacement curve.In addition, because the purpose of the equation parameter of adjusting again is to improve combined floodgate average speed as far as possible, to reduce closing time, therefore, can adopt even corresponding curve x (the t)=at that accelerates ²/ 2 substitution formulas (8) can get:

${\&Integral;}_{t_1}^{t_a}{i}_2\left(t\right)\mathrm{tdt}=E/\left(\mathrm{\&lambda;a}\right)=S---\left(10\right)$

Formula (10) is carried out discretization to be handled and can get:

$S=\frac{t_a-t_1}{N}\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}[i_2(t_1+\frac{n(t_a-t_1)}{N})\&CenterDot;(t_1+\frac{n(t_a-t_1)}{N})]---\left(11\right)$

Can calculate S from the coil current curve of actual measurement by formula (11), the i that formula (2) is provided ₂(t) equation form substitution formula (10) can obtain to find the solution first equation of coefficient.For specific mechanism, because pick-up current I ₁Determine, and behind the phase I parameter tuning, the initiating of pick-up current correspondence is t constantly ₁Determine therefore have according to the current continuity of phase I to second stage:

I ₁=A(t ₁-B) ²+C (12)

For to make the transitions smooth of electric current from the phase I to the second stage, be identified for the current curve equation of reference fast on the other hand, can increase constraints, i ₁' (t ₁)=i' ₂(t ₁), thereby can obtain formula (13):

$\frac{1}{{\mathrm{\&tau;}}_1}{e}^{-\frac{t_1}{{\mathrm{\&tau;}}_1}}-2A(t_1-B)=0---\left(13\right)$

Can uniquely determine a t by formula (10) (13) ₁-t _aThe current curve in stage.

2.2.2 the parameter optimization of second stage current curve

2.2.1 the basic principle that the second stage parameter arranges has been described, how following surface analysis optimizes the parameter of curve of second stage after the current equation parameter optimization of phase I.

Change to t in current rise time phase I ₁' after, corresponding to firm fashionable t' of second stage _aValue and uncertain, therefore, can't directly use formula (10).Because formula (6) has been determined the multiple relation of the current rise time of phase I, can roughly determine the acceleration of second stage according to formula (14), that is:

a/a'=k=t ₁'/t ₁ (14)

Can understand like this for formula (14), be reduced to k the current rise time of phase I doubly if the i.e. lifting of voltage makes, the acceleration of second stage should be able to be brought up to 1/k doubly thereupon so.Because capacitance voltage improves, and will increase the energy storage of electric capacity greatly, therefore above-mentioned condition is satisfiable.This also is the necessary condition that second stage realizes optimization.

Because clearance between open contacts is identical, therefore have:

$t_a^{\&prime;}=t_1^{\&prime;}+\sqrt{k}(t_a-t_1)---\left(15\right)$

Analyze as can be known according to 2.2.1, can think roughly that E is constant, can be revised corresponding area value by (10) so:

S'=E/(λa')=kE/(λa)=Sk (16)

T with formula (15) and (16) difference alternate forms (10) _aAnd S, and utilize the 2.1 phase I equations of optimizing, by with formula (12) and (13) simultaneous, can solve the value of parameter A, B, C.Thereby obtain the equation parameter corresponding to second stage after the phase I parameter optimization.

2.2.3 the integration of current equation and VVVE regulate

2.1 and 2.2 parameters that provided phase I and second stage switching current equation arrange the method for principle and modification equation parameter.Because the equation form of phase III is:

$i_3\left(t\right)=I_a{e}^{-(t-t_a)/{\mathrm{\&tau;}}_2}+I_x[1-e^{-(t-t_a)/{\mathrm{\&tau;}}_2}]$

After the parameter of preceding two the stage equations of acquisition, I in the equation _a, t _aDetermine, and τ ₂Can be by to known curve match or directly measure, the 3rd section unknown parameter only has I so _xValue, the residual voltage of electric capacity when this value is decided by directly that moving contact arrives firm chalaza, and the capacity of residual voltage and electric capacity has much relations.When revising the parameter of current curve, the actual not capacity of specified capacitance, so I _xValue is also indeterminate.Because this stage, wish that electric current can fast rise, thereby enough electromagnetic forces are provided, make moving contact vibration when finishing the excess of stroke, not occur, therefore need I _xGet bigger value.On the other hand, if I _xValue is excessive, then may the situation that electric current can't rise to reference curve occur because the electric capacity residual voltage is lower, influences actual current control effect, therefore, and I _xValue is unsuitable excessive.Amid all these factors, can use I in the first rank equation of revising after the parameter ₀Replace the I of quadravalence section _x, determined i ₃(t).

For determining the essential characteristic of preceding two stage electric currents, the current curve of phase I and second stage is integrated.A mistake! Do not find Reference source.Figure has provided maintenance E when constant, the current curve family that the method according to 2.1 and 2.2 is drawn.Because this method core is the rise time that changes the phase I, and the run duration of corresponding change second stage moving contact, the essence of its method is equivalent to change capacitance voltage, and keeps electric capacity output energy E constant, and namely VV regulates.For set electromagnetic mechanism, for reducing closing time, must improve the electric capacity initial voltage, and will control the moving contact end speed, must guarantee as far as possible that E is the output constant in energy of electric capacity.Namely improve capacitance voltage and reduce capacitance, help to obtain better moving contact kinetic characteristic, this is consistent with the principle that patent " permanent magnetism vacuum circuit-breaker control method and device based on coil current are realized " is obtained the ideal current curve.A mistake! Do not find Reference source.Middle k=t ₁'/t ₁

Fig. 3 has provided when only changing the E value corresponding to preceding two stage one group of reference curve family.Meaning of this group family of curves is equivalent to require when first rank outage stream rise time is constant under open loop situations, and namely the electric capacity initial voltage is constant, but the output energy E of electric capacity changes, at this moment, produce this variation, actual capacitance is changed, namely VE regulates.By formula (9) as can be known, change E the firm sum velocity of circuit breaker is changed, thereby make fashionable generation respective change just.Therefore to be equivalent to initial voltage identical for Fig. 3, when changing capacitance, and the curve under the corresponding open loop situations.Because other parameter is identical, E and S are linear relationship, change E and are equivalent to directly change S, η=S'/S in Fig. 3.

The 3 combined floodgate control examples based on VVVE method permanent magnetism vacuum circuit-breaker

3.1.1 obtain the initial current equation parameter

Realize the optimization to the switching current curve, at first should obtain the parameter of the electric current output equation of corresponding circuit breaker.Second joint has provided the method how equation parameter is set.Be example with 12kV monostable switching current below, analyze and how to use said method.To obtain current equation as can be known by 2.1, at first should obtain the combined floodgate characteristic curve of permanent magnetism vacuum circuit-breaker under one group of known open loop situations.This suite line can be the simulation figure of giving in the design phase, also can be the figure of the actual combined floodgate timed unit of circuit breaker actual samples.When using the simulation figure that the design phase gives, should note the data of electric current are carried out normalized, so that its A/D sampled value with controller is corresponding.

Be 2500uF with the 0 12kV vacuum circuit-breaker that provides at capacitance below, the actual open loop situations curve when initial voltage is 205V is example, illustrates how to obtain necessary known conditions.

The initiating moment t that draws moving contact easily of displacement curve from Fig. 4 ₁, because the clearance between open contacts of this circuit breaker is 9mm, the excess of stroke is 2.5mm, according to this two item number according to firm conjunction of the t that can obtain moving contact _aCurrent curve from 0 can draw pick-up current I ₁Pass through t again ₁Constantly, and t ₂Data are constantly carried out the exponential function match, can obtain this two stage timeconstant ₁And τ ₂Can calculating parameter S by formula (11), thus all parameters of equation obtained.

For the vacuum circuit-breaker of determining type arbitrarily, its pick-up current I ₁, and timeconstant ₁And τ ₂Its explicit physical meaning can be directly provided or by the measuring of reality by the design parameter of mechanism, thereby reduces the error of calculation of phase I, and t ₁, t _a, S then needs to obtain from known characteristic curve.After obtaining these known conditions, can carry out reference curve optimization by the described method of second joint.

3.1.2 realize coarse adjustment and fine setting to 12kV vacuum circuit-breaker closing time under the normal temperature

Curve based on 0 has calculated the equation parameter of coil current according to the described method of second joint, and the optimization method of using second joint resets the parameter of combined floodgate reference current curve, k=0.7 wherein, η=1.

Fig. 5 has provided the reference curve that uses after optimizing, and uses the actual effect of current closed-loop control and the dynamic characteristic comparison diagram under the former specified open loop situations.Under open loop situations, excessive for avoiding coil current because electric current is uncontrolled, use rated voltage 150V.After arrival was closed and closed the position as seen from the figure, current spikes rose, and its later stage is well beyond Fig. 5 indication range.Therefore, under open loop condition, if coil blackout is untimely, the situation that the coil overcurrent burns may appear.From the moving contact displacement curve as can be known, early stage, speed increased slowly, was in the state that continues acceleration, (about 19.38ms place) speed was bigger when arrival had just been closed the position, and when combined floodgate was finished, the moving contact displacement had small size oscillatory occurences to take place, but amplitude is little, does not influence actual pass closing operation.

Under the current closed-loop state of a control, just fashionable is about 14.79ms, is about 95% of firm sum velocity under the former rated condition in the speed of just closing the position as can be known from the moving contact speed (i.e. the tangent line at the firm chalaza of displacement curve place among the figure) of firm chalaza.Under closed-loop control, in the quite a while before the chalaza just, its velocity amplitude is almost kept constant, and accelerator mainly concentrates on the moving contact motion in earlier stage.Because the measured displacements curve is the minimum value place of reference curve as can be seen, moving contact does not move to firm chalaza as yet, the electric current of this moment should be kept the trend that continues to reduce, yet at this moment the reference current curve has required electric current to rise, therefore under this state, the electric current average that rises early stage is slightly less than setting curve.From the measured displacements curve of Fig. 5 as can be seen, under the closed-loop control state, moving contact arrive close close the position after, stable rapidly, be not subjected to displacement oscillatory occurences.

From The above results as can be seen, the current curve after the change parameter makes the pass close characteristic and is greatly improved.Under the reference current curve, the average speed of moving contact increases, and total closing operating time that closes under the former specified 150V voltage of time ratio that closes has reduced 4.55ms, and just sum velocity also decreases, and closes to close the latter stage moving contact of breaker and do not have bounce to take place.

From the 2nd joint as can be known, change parameter S and can play fine setting fashionable effect just, and rationally control the firm sum velocity of circuit breaker, 0 has provided after obtaining to optimize curve, changes the corresponding combined floodgate displacement curve of S value.

By 06 as can be known, along with the increase of S, firm fashionable of circuit breaker is the trend that reduces, and when S hour circuit breaker can't normally close a floodgate.When S rose to 1.2 times from 1.1 times, its firm fashionable had reduced about 0.3ms.Therefore by 06 value that changes S as can be seen, less to closing fashionable influence, can play the effect of fashionable of fine setting pass.

In order to further specify the generality that has of method, use controller to obtain the displacement curve of 35kV vacuum circuit-breaker when changing the S parameter for 0 ℃.

07 further illustrates change S parameter, and to firm fashionable influence of circuit breaker, as we know from the figure, it is influential to the closing time of circuit breaker to change the S parameter.When the S parameter increased, just fashionable was the trend that reduces, and when above in η=1, namely the closing time of vacuum circuit-breaker changes less.

3.1.3 in the different temperatures scope, make the closing time unanimity of 35kV vacuum circuit-breaker

Under open loop situations, the unique curve of the combined floodgate of 35kV vacuum circuit-breaker is measured, as can be seen from Figure 8, under different temperature, the displacement curve of moving contact of breaker there are differences, make firm fashionable of circuit breaker deviation (being that moving contact moves to the moment of just closing before the position) occur, therefore be necessary the kinetic characteristic of moving contact is regulated, make the run duration district in unanimity.

When using the method for current tracking, make controller along same current curve output current value, the combined floodgate displacement of circuit breaker is shown in 09.When Fig. 9 has provided open loop under different temperatures, the displacement curve of moving contact.From 09 as can be seen, the current tracking method can only guarantee under same temperature, the influence that closing time is not changed by capacitance voltage and capacitance.Yet under different temperature, firm fashionable of circuit breaker will be subjected to considerable influence.Therefore can not use same curve output current value at different temperature controllers.

From 010 as can be seen, guaranteed that by the VE control method circuit breaker is under different temperatures, the stability of closing time, make circuit breaker firm fashionable under different temperatures keep good stable, in the different temperatures scope its just fashionable can control in ± 0.5ms, further provide reliable basis for realizing closing to close synchronously.

Should be appreciated that the above detailed description of technical scheme of the present invention being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art is reading on the basis of specification of the present invention and can make amendment to the technical scheme that each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (4)

1. the permanent magnetism vacuum circuit-breaker optimization method of control that closes a floodgate is characterized in that this control method comprises:

1) according to the closing coil electric current of known permanent magnetism vacuum circuit-breaker, determines the initiating moment t of vacuum circuit-breaker moving contact ₁, just the conjunction t _a, and the current value I of vacuum circuit-breaker moving contact initiating moment coil ₁, coil is at the timeconstant of separating brake position ₁Timeconstant with closing position ₂, and calculate the parameter S described in the literary composition;

2) according to aforementioned parameters, determine the parameter of VVVE match current equation, thereby draw VVVE reference current curve;

3) by continuous adjustment factor k and η, recomputate match current equation parameter, the reference current curve that obtains revising, application coil current tracing realizes coarse adjustment and the fine setting to the breaker closing time, to optimize the moving contact of breaker kinetic characteristic.

2. VVVE permanent magnetism vacuum circuit-breaker combined floodgate control method according to claim 1 is characterized in that, the equation of coil current during given the combined floodgate: $i\left(t\right)=\left\{\begin{array}{cc}{i}_1\left(t\right)& t\&le;t_1\\ i_2\left(t\right)& t_1<t\&le;t_a\\ i_3\left(t\right)& t\&GreaterEqual;t_a\end{array}\right.$

Wherein:

$i_1\left(t\right)=I_0(1-e^{-t/{\mathrm{\&tau;}}_1})$

i ₂(t)=A(t-B) ²+C

$i_3\left(t\right)=I_a{e}^{-(t-t_a)/{\mathrm{\&tau;}}_2}+I_x[1-e^{-(t-t_a)/{\mathrm{\&tau;}}_2}].$

3. VVVE permanent magnetism vacuum circuit-breaker combined floodgate control method according to claim 1 is characterized in that, is used for calculating second stage equation i ₂(t) method of parameter:

$\left\{\begin{array}{c}{\&Integral;}_{t_1(A{(t-B)}^2+C)\mathrm{tdt}=S}^{t_a}\\ S=\frac{t_a-t_1}{N}\underset{n=1}{\overset{N}{\mathrm{\&Sigma;}}}{t}_n{i}_2\left(t_n\right)\\ I_1=A{(t_1-B)}^2+C\\ \frac{1}{{\mathrm{\&tau;}}_1}{e}^{-\frac{t_1}{{\mathrm{\&tau;}}_1}}-2A(t_1-B)=0\end{array}\right.$

N is t in the formula ₁To t _aThe sampling number of period AD, t _nBe the actual samples moment of AD, i ₂(t _n) be t _nThe sampled value of moment AD, wherein t _n=t ₁+ n (t _a-t ₁)/N, A, B, C are parameter to be determined.

4. VVVE permanent magnetism vacuum circuit-breaker combined floodgate control method according to claim 1 is characterized in that, the foundation that VVVE regulates, wherein:

K is for regulating parameter

VE regulates S'=η S, and η is for regulating parameter

According to the reference curve that recomputates after the above-mentioned formula adjusting after the described equation parameter of claim 2 obtains adjusting.

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