CN102931669A - Device for switching capacitor bank based on synchronous precharging switch - Google Patents
Device for switching capacitor bank based on synchronous precharging switch Download PDFInfo
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Abstract
The invention provides a device for switching a capacitor bank based on a synchronous precharging switch, wherein a single-pole synchronous switch (K1), a two-pole synchronous switch (K2) and the capacitor bank are connected in series to three-phase power network voltage , precharging circuits (1), (2) and (3) are connected in parallel with two ends of main contacts of the single-pole synchronous switch (K1) and the two-pole synchronous switch (K2), the capacitor bank is precharged through the precharging circuits (1), (2) and (3) under the line voltage of a power network, and when the voltage on the main contacts of the single-pole synchronous switch and the two-pole synchronous switch and the voltage change ratio are at the zero point at the same time, the main contacts of the single-pole synchronous switch (K1) and the two-pole synchronous switch (K2) are opened or closed for switching the capacitor bank through a phase control device according to the predetermined phase angle of power network voltage. The invention further provides a scheme that two single-pole synchronous switches are used for replacing the two-pole synchronous switch. The device avoids the rush current during the process of switching the parallel capacitor bank, and is shut off during the current zero-crossing process, and the switching action is set in second level. The device is environmental-friendly and energy-saving.
Description
Technical field
The present invention relates to reactive power compensation, harmonic and the electrical network power quality controlling field of electric power system, relate to particularly the device based on Synchronous Pre charge switch opening-closing capacitor bank.
Background technology
Electrical network needs reactive power compensation to reach stable line voltage, improves power factor, lowers the purpose of line loss.Opening-closing capacitor bank is to realize the main method of reactive power compensation, yet the state of the art of opening-closing capacitor bank allows of no optimist.
In the reactive power compensation field, have approximately 80% to use the mechanical contact switch switched capacitor, mechanical contact switch is triple-pole switch, three main contactss of triple-pole switch simultaneously closed, open, at uncertain electric network voltage phase angle switched capacitor at random, electric current during input surpasses 4 times to 10,20 times of normal rating electric current, causes the line voltage distortion.In addition, also there is combined floodgate mechanical contact spring, opens the dangerous probability of restriking in the contact, bounce and restrike so that capacitor group overvoltage is damaged capacitor, cause the accident easily.Be that its circuit is simple and still have the reason of mass market occupation rate with the mechanical contact switch switched capacitor, cost is low.
It is found that afterwards the zero crossing Closing Switch at line voltage, and opened switch at current zero-crossing point and come switched capacitor can obviously reduce impulse current, alleged synchro switch technology that Here it is.Because the capacitor group is capacitive load, when electric current was zero opening, line voltage was peak value, crest voltage can be kept on the capacitor, when Closing Switch dropped into the capacitor group again, the charge discharge that at first needs to store on the capacitor generally adopted discharge coil to zero on the engineering.Patent document: " synchro switch ", grant number: CN 101510689 adopts additional conductive discharge circuit.When opening capacitor, the energy of storing on the capacitor is 0.5*C*U
2, coil discharge and conductive discharge all are that energy consumption in vain is very unfortunate in power consumption, the epoch cry that lowers consumption with environment protecting and power-saving deviates from.Because discharge needs the time, so the switch of opening-closing capacitor bank is long by operate time closed, that be opened to again closure, be generally a minute level.Utilize existing synchro switch technology back-to-back during opening-closing capacitor bank, capacitor shoves greatly.
Synchro switch is developed with the shortcoming of opening the existence of capacitor group in order to overcome three utmost point mechanical contact switch while closure.The patent document of the relative synchronous switch that can retrieve, patent document " synchro switch " for example, the patent No.: ZL98808789.8; Patent document: " phase controlling switch device ", application number: 00137229.7; Patent document: " synchro switch ", Granted publication number: CN 101510689; Patent document: " a kind of synchro switch for the control switching of three-phase electric-power capacitor ", application number: 201010591708.0 etc., all talk about synchro switch and realize with three monopolar synchronous switches.All be closed when line voltage is zero, the main contacts of switch does not all have pre-charging device.
Combination switch is by the thyristor switch of accurate trigger action and do not have three utmost point mechanical switchs of required precision to form, and parallel connection type combination switch and series type composite switch are arranged.Patent document: " a kind of electronic zero cut-in and cut-off contactor ", application number: 01113435.6 discloses a kind of parallel connection type combination switch, combination switch is owing to will use thyristor, so more than the simple used number of elements of mechanical switch that adopts, the control sequential is compared simple employing mechanical switch and is wanted complicated, and engineering is used upper combination switch in parallel and tended to run into mechanical switch and open, when changing thyristor over to and putting into operation, the di/dt that thyristor bears is excessive, causes the technical barrier of damage.
Patent document: " a kind of series type composite switch circuit of opening-closing capacitor bank ", Granted publication number: CN 1845456B discloses a kind of series type composite switch, after adopting a high voltage silicon stack diode and a high-voltage and current-limitation resistance being connected, mechanical switch in parallel, as hanging down at a slow speed the high withstand voltage switch of precision, a thyristor, a diode and a mechanical switch parallel connection are as the low withstand voltage switch of quick high accuracy.It is too complicated that series type composite switch circuit is applied in the three-phase circuit structure and control logic, and when mechanical switch was closed, thyristor switch existed dv/dt excessive, holds flimsy technical barrier.The maximum saving grace of this patent is for having proposed first a kind of pre-charge circuit of the mechanical switch of opening-closing capacitor bank.
Patent document " a kind of 2 controls, 3 precharge phased switch circuit of opening-closing capacitor bank ", authorize publication number: CN201378738Y, this patent is with respect to disclosed series type composite switch in the patent document " a kind of series type composite switch circuit of opening-closing capacitor bank ", remove the low withstand voltage switch of quick high accuracy of a thyristor, a diode and a mechanical switch parallel connection, simplified circuit.This patent document adopts two independently one pole precharge synchro switches.The negative electrode of two high voltage silicon stack diodes that synchro switch is other all is connected on the mains side of switch, and perhaps the anode of two high voltage silicon stack diodes all is connected on the mains side of switch.For overcoming the bounce of switch contact, switch ends has increased the RC absorbing circuit.This patent has proposed application precharge synchro switch and has realized quick non-impact current switched capacitor, the opening-closing capacitor bank technical scheme of obviously not shoving back-to-back, but this patent is to adopt the monopolar synchronous switch of two platform independent to realize that the switch control of three-phase circuit is so-called 2 controls, 3 circuit.This 2 controls, 3 circuit are no problem in low pressure applications, and 2 controls, 3 circuit are used to exist in medium voltage network and produced the large danger of probability of restriking.
Patent document " based on the Intelligent Reactive Compensation Equipment of separate unit tri-level sync switch ", granted patent number: CN202474877U, adopt separate unit triple-pole switch opening-closing capacitor bank, two main contact parallels of triple-pole switch pre-charge circuit, the 3rd main contacts do not have pre-charge circuit, this patent has broken through synchro switch can only adopt 3 independently versions of monopolar synchronous switch, but because circuit structure is terse, it is the opening-closing capacitor bank under accurate perfect condition, two are being moved near under the perfect condition in three main contactss, a contact does not have pre-charge circuit, running status is identical with conventional synchro switch, the switch main contacts is closed when being zero at voltage, is not closed when voltage and voltage change ratio are zero simultaneously.
Thyristor switchable capacitor (TSC) circuit can drop into capacitor accurately, fast in 20ms, and does not have rush of current, the problem of do not have spring, restriking.But middle pressure TSC circuit needs a plurality of Thyristors in series, and there is the tube voltage drop about 2V in the thyristor conducting, and thyristor consumes the heat of several kW when pressing the TSC circuit turn-on in the cover.So large caloric requirement is dispelled the heat by equipment such as air-cooled, water-cooled, heat pipes.Because the TSC technical difficulty is large, energy consumption is large, cost is high, so only be applied in low-pressure field, it is few that use in middle pressure field.
Summary of the invention
The objective of the invention is, on the basis of each technical scheme of above-mentioned switched capacitor, the comprehensive advantage that absorbs wherein, overcome inferior position wherein, a kind of Synchronous Pre charge switch opening-closing capacitor bank device has in the ideal situation been proposed, different with the synchro switch of routine, conventional synchro switch adopts 3 independently monopolar synchronous switches, the present invention has adopted a monopolar synchronous switch and the two poles of the earth synchro switch, the not additional any element of the main contacts of conventional synchro switch, each main contacts two ends of Synchronous Pre charge switch of the present invention pre-charge circuit that all is being connected in parallel, under same operation principle, can transposition according to the element of principles of electric and electronic engineering series circuit, operation principle is constant, and the principles of electric and electronic engineering are about star circuit and delta network equivalent transformation principle, and the principle of duality in the principles of electric and electronic engineering, be combined into different circuit structures, adapt to the application of various different occasions.Owing to be to work in the ideal situation, Synchronous Pre charge switch opening-closing capacitor bank device of the present invention have action fast, comprise back-to-back opening-closing capacitor bank no-flashy-flow, the few or not phenomenon of restriking, the advantage of green energy conservation, use the general precision contactor and finish the action of high-precision synchro switch, can be applicable to each current class of low pressure, middle pressure, high pressure, be convenient to engineering and widely apply.
The present invention is Synchronous Pre charge switch opening-closing capacitor bank device, switch for opening-closing capacitor bank in the three-phase circuit, adopt a monopolar synchronous switch and the two poles of the earth synchro switch, compare the monopolar synchronous switch that conventional synchro switch adopts 3 platform independent, the circuits for triggering of switch coil reduce to two by 3, the position feedback of Simultaneous Switching also reduces to 2 by 3, and is simple in structure, and control logic is also simple.
The present invention realizes by following scheme:
A kind of device based on Synchronous Pre charge switch opening-closing capacitor bank, monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) are connected in series to three phase network voltage with the capacitor group, wherein, pre-charge circuit (1) is being connected in parallel between the input of the main contacts K1A of monopolar synchronous switch (K1) and the output, pre-charge circuit (2) is being connected in parallel between the input of the main contacts K2A of the two poles of the earth synchro switch (K2) and the output, pre-charge circuit (3) is being connected in parallel between the input of the main contacts K2B of the two poles of the earth synchro switch (K2) and the output, grid line voltage is by described pre-charge circuit (1), described pre-charge circuit (2) and described pre-charge circuit (3) are given the precharge of described capacitor group, phase control device is according to the phase angle of predetermined line voltage, voltage on the main contacts of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) and voltage change ratio are the place at zero point simultaneously, turn on and off the main contacts of described monopolar synchronous switch (K1) and described the two poles of the earth synchro switches (K2), with opening-closing capacitor bank.
In above-mentioned a kind of execution mode, described monopolar synchronous switch (K1), the two poles of the earth synchro switch (K2) and described capacitor group can connect into the delta network form.
The present invention also replaces above-mentioned the two poles of the earth synchro switch with two monopolar synchronous switches, concrete scheme is: three monopolar synchronous switch (K1, K2, K3) be connected in series to three phase network voltage with the capacitor group, wherein, three monopolar synchronous switches (K1, K2, K3) separately the input of main contacts and output between the pre-charge circuit (1 that is being connected in parallel respectively, 2,3), grid line voltage is by described pre-charge circuit (1,2,3) give the precharge of described capacitor group, phase control device is according to the phase angle of predetermined line voltage, at three monopolar synchronous switch (K1, K2, K3) voltage on separately the main contacts and voltage change ratio for the place at zero point, turn on and off three monopolar synchronous switches (K1, K2 simultaneously, K3) main contacts is with opening-closing capacitor bank.
In above-mentioned a kind of execution mode, described three monopolar synchronous switches (K1, K2, K3) and described capacitor group connect into the delta network form.
Described pre-charge circuit (1) is comprised of the diode that is connected in series (D1) and resistor (R1), and the negative electrode of diode (D1) is connected to the phase in the line voltage; Described pre-charge circuit (2) is comprised of the diode that is connected in series (D2) and resistor (R2), and the negative electrode of diode (D2) is connected to another phase of line voltage; Described pre-charge circuit (3) is comprised of the diode that is connected in series (D3) and resistor (R3), and the anodic bonding of diode (D3) is to an again phase of line voltage.
Described diode (D1), diode (D2) and diode (D3) are high voltage silicon stack or general-purpose diode; Described resistor (R1), resistor (R2) and resistor (R3) are high voltage resistor or conventional, electric-resistance device.
The phase angle of described predetermined line voltage is chosen as: when phase control device receives the input order of switching order S1, be the place at zero point simultaneously at the voltage peak point of the corresponding grid line voltage of the two poles of the earth synchro switch (K2) main contacts of be connected in parallel described pre-charge circuit (2) and pre-charge circuit (3) and the voltage on this two main contactss and voltage change ratio, connect the main contacts of the two poles of the earth synchro switches (K2), be the place at zero point simultaneously at the voltage peak point of the corresponding electrical network phase voltage of described pre-charge circuit (1) monopolar synchronous switch (K1) main contacts that is being connected in parallel and the voltage on this main contacts and voltage change ratio, connect the main contacts of monopolar synchronous switch (K1); When phase control device receives the excision order of switching order S1, the phase place place of the electrical network phase voltage when the corresponding input of described pre-charge circuit (1) monopolar synchronous switch (K1) main contacts that is being connected in parallel, namely be that voltage on phase voltage peak point and this main contacts and voltage change ratio are the place at zero point simultaneously, the main contacts of excision monopolar synchronous switch (K1), the phase place place of the grid line voltage when the corresponding input of the two poles of the earth synchro switch (K2) main contacts of be connected in parallel described pre-charge circuit (2) and pre-charge circuit (3), namely be that the voltage peak point of grid line voltage and the voltage on this two main contactss and voltage change ratio are the place at zero point simultaneously, the main contacts of excision the two poles of the earth synchro switches (K2), line voltage is by pre-charge circuit (1), pre-charge circuit (2) and pre-charge circuit (3) charge to the capacitor group.
Described monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) are a kind of in permanent magnet contactor or the electromagnetic treadle.
Useful technique effect of the present invention:
Device of the present invention is desirable opening-closing capacitor bank state, when opening-closing capacitor bank, switch by closed, to be opened to again closed operate time be 1～6 second, be greatly to reduce minute level the operate time of comparing the synchro switch of the routine of mentioning in the background technology.And, comprise back-to-back reaching the no-flashy-flow opening-closing capacitor bank that the phenomenon of rarely or substantially not restriking can obtain excellent electric switching effect, has splendid electric property.Compensation arrangement of the present invention adopts synchro switch, and switch closure does not have energy consumption, do not need in the device discharge coil or discharge resistance are set, and be green energy conservation.Device of the present invention is widely used in low pressure (1KV following), middle pressure (1KV～35KV), high pressure (＞35KV) each current class of occasion.
Description of drawings
Fig. 1: the circuit diagram according to an embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, form the precharge fling-cut switch by one pole and two-photo pole switch, wherein the capacitor group connects into the star circuit form;
Fig. 2: the voltage and current working waveform figure of capacitor C1 shown in Figure 1;
Fig. 3: the voltage and current working waveform figure of capacitor C2 shown in Figure 1;
Fig. 4: the voltage and current working waveform figure of capacitor C3 shown in Figure 1;
Fig. 5: the circuit diagram according to second embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, form the precharge fling-cut switch by one pole and two-photo pole switch, wherein the capacitor group connects into the delta network form;
Fig. 6: according to the circuit diagram of the 3rd embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, form the precharge fling-cut switch by one pole and two-photo pole switch, the precharge synchro switch is installed in the zero point of capacitor group, and wherein the main contacts of tri-level sync switch connects into star form;
Fig. 7: according to the circuit diagram of the 4th embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, form the precharge fling-cut switch by one pole and two-photo pole switch, wherein the capacitor group connects into the delta network form, and the precharge synchro switch is installed in the triangle;
Fig. 8: according to the circuit diagram of the 5th embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, 3 single-pole switchs form the precharge fling-cut switches, and wherein the capacitor group connects into the star circuit form;
Fig. 9: according to the circuit diagram of the 6th embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, form the precharge fling-cut switch by 3 single-pole switchs, the precharge synchro switch is installed in the zero point of capacitor group, and wherein the main contacts of tri-level sync switch connects into star form;
Figure 10: according to the circuit diagram of the 7th embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, form the precharge fling-cut switch by 3 single-pole switchs, wherein the capacitor group connects into the delta network form, and the precharge synchro switch is installed in the triangle.
Embodiment
Fig. 1 shows an embodiment according to the device based on Synchronous Pre charge switch opening-closing capacitor bank of the present invention, input X1, the X3 of the input X1 of the main contacts K1A of monopolar synchronous switch (K1) and two main contacts K2A, K2B of the two poles of the earth synchro switch (K2) are connected with three phase network voltage U, V, W respectively, and the output X2 of the main contacts K1A of monopolar synchronous switch (K1) is connected K2 with the two poles of the earth synchro switch) output X2, the X4 of main contacts K2A, K2B be connected with the capacitor group respectively.Wherein, pre-charge circuit (1) is being connected in parallel between the input X1 of the main contacts K1A of monopolar synchronous switch (K1) and the output X2, pre-charge circuit (2) is being connected in parallel between the input X1 of a main contacts K2A of the two poles of the earth synchro switch (K2) and the output X2, the pre-charge circuit (3) that is being connected in parallel between the input X3 of another main contacts K2B of the two poles of the earth synchro switch (K2) and the output X4, the grid line voltage U
WUGive described capacitor group C1, C3 precharge, grid line voltage U by described pre-charge circuit (3) and described pre-charge circuit (1)
VWGive described capacitor group C2, C3 precharge by described pre-charge circuit (3) and described pre-charge circuit (2), phase control device is according to the phase angle of predetermined line voltage, voltage on main contacts K2A, the K2B of the main contacts K1A of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) and voltage change ratio are the place at zero point simultaneously, turn on and off the main contacts of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2), with opening-closing capacitor bank.
Pre-charge circuit (1) is comprised of the diode that is connected in series (D1) and resistor (R1), and the negative electrode of diode (D1) is connected to the U phase in the line voltage; Described pre-charge circuit (2) is comprised of the diode that is connected in series (D2) and resistor (R2), and the negative electrode of diode (D2) is connected to the V phase of line voltage; Described pre-charge circuit (3) is comprised of the diode that is connected in series (D3) and resistor (R3), and the anodic bonding of diode (D3) is to the W phase of line voltage.
Diode (D1), diode (D2) and diode (D3) can adopt high voltage silicon stack or general-purpose diode; Resistor (R1), resistor (R2) and resistor (R3) can adopt high voltage resistor or conventional, electric-resistance device.
When phase control device receives the input order of switching order S1, in the corresponding grid line voltage U of main contacts K2A, K2B of the two poles of the earth synchro switch (K2) of the pre-charge circuit that is being connected in parallel (2) and pre-charge circuit (3)
VWVoltage peak point and the voltage on this two main contactss and voltage change ratio be the place at zero point simultaneously, connect the main contacts of the two poles of the earth synchro switches (K2), at the corresponding electrical network phase voltage of the main contacts K1A U of the monopolar synchronous switch (K1) of the pre-charge circuit that is being connected in parallel (1)
UVoltage peak point and the voltage on this main contacts and voltage change ratio be the place at zero point simultaneously, connect the main contacts of monopolar synchronous switch (K1); When phase control device receives the excision order of switching order S1, at the electrical network phase voltage U that the main contacts K1A of the monopolar synchronous switch (K1) of the pre-charge circuit that is being connected in parallel (1) is corresponding when dropping into
UThe phase place place, namely be that voltage on phase voltage peak point and this main contacts and voltage change ratio are the place at zero point simultaneously, the main contacts of excision monopolar synchronous switch (K1), the grid line voltage U when the corresponding input of main contacts K2A, the K2B of the two poles of the earth synchro switch (K2) of the pre-charge circuit that is being connected in parallel (2) and pre-charge circuit (3)
VWThe phase place place, namely be that the voltage peak point of grid line voltage and the voltage on this two main contactss and voltage change ratio are the place at zero point simultaneously, the main contacts of excision the two poles of the earth synchro switches (K2), line voltage charges to the capacitor group by pre-charge circuit (1), pre-charge circuit (2) and pre-charge circuit (3).After 1～6 second, when again receiving switching order S1 close command, line voltage synchronizing indicator 4, phase controller 5 and 6 work of K1 coil actuator, drive K2 coil, K1 coil, phase angle according to above-mentioned predetermined line voltage, closed the two poles of the earth synchro switches (K2) and monopolar synchronous switch (K1), the capacitor group puts into operation again.
Fig. 2～Fig. 4 shows respectively with in Fig. 1 circuit of oscilloscope measurement, the working waveform figure of the voltage and current of capacitor C1, capacitor C2 and capacitor C3.Can find out that from Fig. 2, Fig. 3, Fig. 4 when every phase capacitor of three-phase condenser bank dropped into, switch shoved not quite, during excision, the voltage on the capacitor can not exceed the peak value of electrical network phase voltage, and voltage value is little.The electric property that this shows apparatus of the present invention is good, and voltage, the current waveform of the capacitor group of measurement satisfy commercial Application.The frequency of electrical network is 50Hz, and a cycle is 20ms, the switch that the oscillogram of measuring from Fig. 2, Fig. 3, Fig. 4 it can also be seen that opening-closing capacitor bank by closed, be opened to again closed operate time less than 1 second, satisfy the requirement of quick-switching action.
The below describes the selection of the main element that adopts based on the device of Synchronous Pre charge switch opening-closing capacitor bank of the present invention for example.Application of installation of the present invention is when line voltage 10KV electric current 200A, monopolar synchronous K switch 1 adopts common one pole permanent magnet contactor, model is CKG4-250/12-DY (one pole) for example, the two poles of the earth synchro switch K2 adopts common the two poles of the earth permanent magnet contactor, model is CKG4-250/12-Y (the two poles of the earth) for example, diode D1, D2, D3 are the high voltage silicon stack diode, diode D1, D2, D3 voltage are 60KV, electric current 1A, the high-voltage and current-limitation resistor R1, R2, the R3 that connect with high voltage silicon stack diode D1, D2, D3 are 12KV, 10K ohm, the high-tension resistive of 500W.
Monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) can be selected permanent magnet contactor or electromagnetic treadle.
The pre-charge circuit 2 and can exchange the position that is connected in monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) main contacts in parallel by the pre-charge circuit 3 of connecting that high voltage silicon stack diode D3 and high-voltage and current-limitation resistor R3 form of connecting of connecting pre-charge circuit 1 and being formed by high voltage silicon stack diode D2 and high-voltage and current-limitation resistor R2 that is formed by high voltage silicon stack diode D1 and high-voltage and current-limitation resistor R1, as long as synchronous voltage signal is done corresponding the adjustment, control program is constant, and the switching effect can not be affected yet.
According in the principles of electric and electronic engineering about the principle of star circuit and delta network equivalent transformation, the filtering capacitor group that is comprised of three-phase reactor L and capacitor C can connect into the star circuit form, also can connect into the delta network form, which kind of type of attachment no matter reactor L adopt all to realize identical switching effect with capacitor C.Based on this, another embodiment of the present invention is proposed.Fig. 5 shows the circuit diagram according to the second embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, and is different from the capacitor group of star connection shown in Figure 1, and in this embodiment, the capacitor group is used delta connection.
According to the principle that the element front and back position of series circuit in the principles of electric and electronic engineering can change, the present invention also proposes the 3rd embodiment based on the device of Synchronous Pre charge switch opening-closing capacitor bank of circuit topological structure shown in Figure 6.As shown in Figure 6, the capacitor group is Y-connection, the main contacts K2A of the input X1 of the main contacts K1A of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2), the input X1 of K2B, X3 all is connected to the place at zero point of capacitor group, the main contacts K2A of the output X2 of the main contacts K1A of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2), the output X2 of K2B, X4 connects together, the main contacts of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) consists of the Zero-point switch of the star structure form of capacitor group, pre-charge circuit (1) wherein is being connected in parallel between the input X1 of the main contacts K1A of monopolar synchronous switch (K1) and the output X2, pre-charge circuit (2) is being connected in parallel between the input X1 of the main contacts K2A of the two poles of the earth synchro switch (K2) and the output X2, pre-charge circuit (3) is being connected in parallel between the input X3 of the main contacts K2B of the two poles of the earth synchro switch (K2) and the output X4, grid line voltage is by pre-charge circuit (1), pre-charge circuit (2) and pre-charge circuit (3) are to the precharge of capacitor group, phase control device is according to the phase angle of predetermined line voltage, voltage on the main contacts of the main contacts of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) and voltage change ratio are the place at zero point simultaneously, turn on and off the main contacts of monopolar synchronous switch (K1) and the main contacts of the two poles of the earth synchro switch (K2), with opening-closing capacitor bank.
Fig. 7 shows the 4th embodiment according to the device based on Synchronous Pre charge switch opening-closing capacitor bank of the present invention, wherein, the capacitor group is comprised of the reactor that connects into the delta network form and capacitor, the main contacts K2A of the main contacts K1A of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2), K2B is installed in the delta network, be connected in series with the capacitor group, wherein, pre-charge circuit (1) is being connected in parallel between the input X1 of the main contacts K1A of monopolar synchronous switch (K1) and the output X2, the pre-charge circuit (2) that is being connected in parallel between the input X1 of the main contacts K2A of the two poles of the earth synchro switch (K2) and the output X2, pre-charge circuit (3) is being connected in parallel between the input X3 of the main contacts K2B of the two poles of the earth synchro switch (K2) and the output X4.
In the above-described embodiments, adopt a monopolar synchronous switch and two-stage synchro switch to construct the device of opening-closing capacitor bank.The present invention also can adopt two monopolar synchronous switches to replace the two poles of the earth synchro switch K2 shown in Fig. 1, Fig. 5-7, and this is described below.
Fig. 8-10 shows the 5th, the 6th and the 7th embodiment according to the device based on Synchronous Pre charge switch opening-closing capacitor bank of the present invention, they correspond respectively to Fig. 1, Fig. 6 and embodiment shown in Figure 7, have just substituted the two poles of the earth synchro switch K2 with two single-pole switch K2 and K3.Control strategy adjusts accordingly and gets final product.Phase control device is according to the phase angle of predetermined line voltage, voltage on the main contacts separately of monopolar synchronous switch (K1), monopolar synchronous switch (K2) and monopolar synchronous switch (K3) and voltage change ratio are the place at zero point simultaneously, turn on and off monopolar synchronous switch (K1), monopolar synchronous switch (K2) and monopolar synchronous switch (K3) main contacts, with opening-closing capacitor bank.
Specific embodiment of the present invention has been made detailed explanation to content of the present invention, and for persons skilled in the art, any apparent change of under the prerequisite that does not deviate from spirit and scope of the invention it being done all thinks open by the present invention.
Claims (11)
1. device based on Synchronous Pre charge switch opening-closing capacitor bank, it is characterized in that: monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) are connected in series to three phase network voltage with the capacitor group, wherein, pre-charge circuit (1) is being connected in parallel between the input of the main contacts K1A of monopolar synchronous switch (K1) and the output, pre-charge circuit (2) is being connected in parallel between the input of the main contacts K2A of the two poles of the earth synchro switch (K2) and the output, pre-charge circuit (3) is being connected in parallel between the input of the main contacts K2B of the two poles of the earth synchro switch (K2) and the output, grid line voltage is by described pre-charge circuit (1), described pre-charge circuit (2) and described pre-charge circuit (3) are given the precharge of described capacitor group, phase control device is according to the phase angle of predetermined line voltage, voltage on the main contacts of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) and voltage change ratio are the place at zero point simultaneously, turn on and off the main contacts of described monopolar synchronous switch (K1) and described the two poles of the earth synchro switches (K2), with opening-closing capacitor bank.
2. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 1, it is characterized in that: described monopolar synchronous switch (K1), the two poles of the earth synchro switch (K2) and described capacitor group connect into the delta network form.
3. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 1, it is characterized in that: described pre-charge circuit (1) is comprised of the diode that is connected in series (D1) and resistor (R1), and the negative electrode of diode (D1) is connected to the phase in the line voltage; Described pre-charge circuit (2) is comprised of the diode that is connected in series (D2) and resistor (R2), and the negative electrode of diode (D2) is connected to another phase of line voltage; Described pre-charge circuit (3) is comprised of the diode that is connected in series (D3) and resistor (R3), and the anodic bonding of diode (D3) is to an again phase of line voltage.
4. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 3, it is characterized in that: described diode (D1), diode (D2) and diode (D3) they are high voltage silicon stack or general-purpose diode; Described resistor (R1), resistor (R2) and resistor (R3) are high voltage resistor or conventional, electric-resistance device.
5. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 1 is characterized in that; Described monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) are a kind of in permanent magnet contactor or the electromagnetic treadle.
6. the device of each described Synchronous Pre charge switch opening-closing capacitor bank according to claim 1-5, it is characterized in that: the phase angle of described predetermined line voltage is chosen as: when phase control device receives the input order of switching order S1, be the place at zero point simultaneously at the voltage peak point of two corresponding grid line voltages of main contacts of the two poles of the earth synchro switch (K2) of be connected in parallel described pre-charge circuit (2) and pre-charge circuit (3) and the voltage on this two main contactss and voltage change ratio, connect the main contacts of the two poles of the earth synchro switches (K2), be the place at zero point simultaneously at the voltage peak point of the corresponding electrical network phase voltage of main contacts of the monopolar synchronous switch (K1) of the described pre-charge circuit (1) that is being connected in parallel and the voltage on this main contacts and voltage change ratio, connect the main contacts of monopolar synchronous switch (K1); When phase control device receives the excision order of switching order S1, phase place place in the electrical network phase voltage that the main contacts of the monopolar synchronous switch (K1) of the described pre-charge circuit (1) that is being connected in parallel is corresponding when dropping into, namely be that voltage on phase voltage peak point and this main contacts and voltage change ratio are the place at zero point simultaneously, the main contacts of excision monopolar synchronous switch (K1), phase place place at the grid line voltage that two main contactss of the two poles of the earth synchro switch (K2) of be connected in parallel described pre-charge circuit (2) and pre-charge circuit (3) are corresponding when dropping into, namely be that the voltage peak point of grid line voltage and the voltage on this two main contactss and voltage change ratio are the place at zero point simultaneously, the main contacts of excision the two poles of the earth synchro switches (K2), line voltage is by described pre-charge circuit (1), pre-charge circuit (2) and pre-charge circuit (3) charge to the capacitor group.
7. device based on Synchronous Pre charge switch opening-closing capacitor bank, it is characterized in that: three monopolar synchronous switch (K1, K2, K3) be connected in series to three phase network voltage with the capacitor group, wherein, three monopolar synchronous switches (K1, K2, K3) separately the input of main contacts and output between the pre-charge circuit (1 that is being connected in parallel respectively, 2,3), grid line voltage is by described pre-charge circuit (1,2,3) give the precharge of described capacitor group, phase control device is according to the phase angle of predetermined line voltage, at three monopolar synchronous switch (K1, K2, K3) voltage on separately the main contacts and voltage change ratio for the place at zero point, turn on and off three monopolar synchronous switches (K1, K2 simultaneously, K3) main contacts is with opening-closing capacitor bank.
8. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 7, it is characterized in that: described three monopolar synchronous switches (K1, K2, K3) and described capacitor group connect into the delta network form.
9. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 7, it is characterized in that: described pre-charge circuit (1) is comprised of the diode that is connected in series (D1) and resistor (R1), and the negative electrode of diode (D1) is connected to the phase in the line voltage; Described pre-charge circuit (2) is comprised of the diode that is connected in series (D2) and resistor (R2), and the negative electrode of diode (D2) is connected to another phase of line voltage; Described pre-charge circuit (3) is comprised of the diode that is connected in series (D3) and resistor (R3), and the anodic bonding of diode (D3) is to an again phase of line voltage.
10. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 9, it is characterized in that: described diode (D1), diode (D2) and diode (D3) they are high voltage silicon stack or general-purpose diode; Described resistor (R1), resistor (R2) and resistor (R3) are high voltage resistor or conventional, electric-resistance device.
11. Synchronous Pre charge switch opening-closing capacitor bank device according to claim 7 is characterized in that: described three monopolar synchronous switches (K1, K2, K3) are a kind of in permanent magnet contactor or the electromagnetic treadle.
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