CN102931669B - Based on the device of Synchronous Pre charge switch opening-closing capacitor bank - Google Patents
Based on the device of Synchronous Pre charge switch opening-closing capacitor bank Download PDFInfo
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- CN102931669B CN102931669B CN201210468939.1A CN201210468939A CN102931669B CN 102931669 B CN102931669 B CN 102931669B CN 201210468939 A CN201210468939 A CN 201210468939A CN 102931669 B CN102931669 B CN 102931669B
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- Y02E40/30—Reactive power compensation
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Abstract
The present invention proposes a kind of device of Synchronous Pre charge switch opening-closing capacitor bank, wherein, monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) are connected in series to three-phase power grid voltage with Capacitor banks, the main contacts two ends of monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) are connected in parallel pre-charge circuit (1, 2, 3), grid line voltage is by pre-charge circuit (1, 2, 3) to Capacitor banks precharge, phase control device is according to the phase angle of predetermined line voltage, voltage on the main contacts of one pole and two-photo pole switch and voltage change ratio are 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.The present invention proposes the scheme replacing above-mentioned the two poles of the earth synchro switch with two monopolar synchronous switches further.This device is no-flashy-flow when opening-closing capacitor bank back-to-back, and current over-zero disconnects, and switch motion is level second, device green energy conservation.
Description
Technical field
The present invention relates to the reactive power compensation of electric power system, harmonic and electrical network power quality controlling field, relate to the device based on Synchronous Pre charge switch opening-closing capacitor bank particularly.
Background technology
Electrical network needs reactive power compensation to reach stable line voltage, improves power factor, lowers the object of line loss.Opening-closing capacitor bank is the main method realizing reactive power compensation, but the state of the art of opening-closing capacitor bank allows of no optimist.
In reactive power compensation field, about there is 80% use mechanical contact switch switched capacitor, mechanical contact switch is triple-pole switch, three main contactss of triple-pole switch close simultaneously, open, at random uncertain electric network voltage phase angle switched capacitor, electric current during input exceedes 4 times of normal rating electric current to 10,20 times, causes line voltage to distort.In addition, also there is the spring of combined floodgate mechanical contact, open the dangerous probability restriked in contact, bouncing and restriking makes Capacitor banks overvoltage, damages capacitor, easily causes the accident.And still having the reason of mass market occupation rate to be that its circuit is simple with mechanical contact switch switched capacitor, cost is low.
It is found that the zero crossing Closing Switch at line voltage afterwards, and opened switch at current zero-crossing point and carry out switched capacitor and obviously can reduce impulse current, alleged synchro switch technology that Here it is.Because Capacitor banks is capacitive load, electric current be zero open time, line voltage is peak value, crest voltage can be preserved on the capacitor, when Closing Switch again drops into Capacitor banks, first to need charge discharge that capacitor stores, to zero, engineering generally to adopt discharge coil.Patent document: " synchro switch ", grant number: CN101510689 adopts additional conductive discharge circuit.When opening capacitor, the energy that capacitor stores is 0.5*C*U
2, coil discharge and conductive discharge are all that energy consumption is in vain very unfortunate, and the epoch cry lowered consumption with environment protecting and power-saving deviates from power consumption.Because electric discharge needs the time, so the switch of opening-closing capacitor bank is long by closing, being opened to again closed operate time, be generally a minute level.Utilize existing synchro switch technology back-to-back opening-closing capacitor bank time, capacitor shoves greatly.
Synchro switch closes simultaneously to overcome three pole mechanical contact switch and opens the shortcoming of Capacitor banks existence and develop.The patent document of the relative synchronous switch that can retrieve, such as patent document " synchro switch ", the patent No.: ZL98808789.8; Patent document: " phase controlling switch device ", application number: 00137229.7; Patent document: " synchro switch ", Authorization Notice No.: CN101510689; Patent document: " a kind of synchro switch for controlling switching of three-phase electric-power capacitor ", application number: 201010591708.0 etc., all talks about synchro switch three monopolar synchronous switches and realizes.Be all close when line voltage is zero, the main contacts of switch does not all have pre-charging device.
Combination switch by accurate trigger action thyristor switch and do not have three pole mechanical switchs of required precision to form, have parallel connection type combination switch and series type composite switch.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 using thyristor, so more than the simple mechanical switch number of elements used that adopts, Control timing sequence is compared the simple mechanical switch that adopts and is wanted complicated, and on engineer applied, combination switch in parallel often runs into mechanical switch and opens, and proceeds to thyristor when 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 ", Authorization Notice No.: CN1845456B discloses a kind of series type composite switch, after adopting a diode of high-voltage silicon rectifier stack and a high-voltage and current-limitation resistant series, a mechanical switch in parallel, resistance toly to compress switch as low precision is at a slow speed high, a thyristor, a diode and mechanical switch are in parallel resistance toly to compress switch as quick high accuracy is low.Series type composite switch circuit is applied in that structure and control logic in three-phase circuit are too complicated, and when mechanical switch closes, it is excessive that thyristor switch exists dv/dt, holds flimsy technical barrier.The maximum saving grace of this patent is a kind of pre-charge circuit of the mechanical switch proposing opening-closing capacitor bank first.
Patent document " a kind of 2 control 3 precharge phased switch circuit of opening-closing capacitor bank ", authorize publication number: CN201378738Y, this patent is relative to series type composite switch disclosed in patent document " a kind of series type composite switch circuit of opening-closing capacitor bank ", eliminate a thyristor, the quick high accuracy of a diode and a mechanical switch parallel connection lowly resistance toly to compress switch, simplify circuit.This patent document adopts two independently one pole precharge synchro switches.The negative electrode of two diode of high-voltage silicon rectifier stack that synchro switch is other is all connected on the mains side of switch, or the anode of two diode of high-voltage silicon rectifier stack is all connected on the mains side of switch.For overcoming the bounce of switch contact, switch ends adds RC absorbing circuit.The patent proposes application precharge synchro switch and realize quick non-impact current switched capacitor, the opening-closing capacitor bank technical scheme of obviously not shoving back-to-back, but this patent is that the monopolar synchronous switch of employing two platform independent realizes the switch control rule of three-phase circuit and so-called 2 control 3 circuit.This 2 control 3 circuit are no problem in low pressure applications, and 2 control 3 circuit are applied to also exist and produced the large danger of probability of restriking in medium voltage network.
Patent document " Intelligent Reactive Compensation Equipment based on 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, 3rd main contacts does not have pre-charge circuit, this patent breaches the version that synchro switch can only adopt 3 independently monopolar synchronous switches, but because circuit structure is terse, in standard opening-closing capacitor bank ideally, in three main contactss, two are ideally run close, a contact does not have pre-charge circuit, running status is identical with conventional synchro switch, switch main contacts is closed when voltage is zero, not closed when voltage and voltage change ratio are zero simultaneously.
Thyristor switchable capacitor (TSC) circuit accurately, fast can drop into capacitor in 20ms, and does not have rush of current, the problem of there is not spring, restriking.But middle pressure TSC circuit needs multiple Thyristors in series, and turn on thyristors exists the tube voltage drop of about 2V, during a set of middle pressure TSC circuit turn-on, thyristor consumes the heat of several kW.So large caloric requirement is dispelled the heat by the equipment such as air-cooled, water-cooled, heat pipe.Because TSC technical difficulty is large, energy consumption is large, cost is high, therefore is only applied in low-pressure field, and it is few that middle pressure field is applied.
Summary of the invention
The object of the invention is, on the basis of each technical scheme of above-mentioned switched capacitor, comprehensive absorption advantage wherein, overcome inferior position wherein, propose a kind of Synchronous Pre charge switch opening-closing capacitor bank device in the ideal situation, different with the synchro switch of routine, conventional synchro switch adopts 3 independently monopolar synchronous switches, present invention employs a monopolar synchronous switch and the two poles of the earth synchro switch, the not additional any element of main contacts of conventional synchro switch, each main contacts two ends of Synchronous Pre charge switch of the present invention are all connected in parallel pre-charge circuit, under same operation principle, element according to principles of electric and electronic engineering series circuit can transposition, operation principle is constant, the principles of electric and electronic engineering are about star circuit and delta network equivalent transformation principle, with 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 occasion.Owing to being work in the ideal situation, Synchronous Pre charge switch opening-closing capacitor bank device of the present invention have action fast, comprise opening-closing capacitor bank no-flashy-flow back-to-back, seldom or not to restrike phenomenon, the advantage of green energy conservation, application general precision contactor completes the action of high-precision synchro switch, each current class of low pressure, middle pressure, high pressure can be applicable to, be convenient to engineering and widely apply.
The present invention is Synchronous Pre charge switch opening-closing capacitor bank device, for the switch of opening-closing capacitor bank in three-phase circuit, adopt a monopolar synchronous switch and the two poles of the earth synchro switch, compare the monopolar synchronous switch that conventional synchronous 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 structure is simple, and control logic is also simple.
The present invention is realized 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 power grid voltage with Capacitor banks, wherein, pre-charge circuit (1) is connected in parallel between the input of the main contacts K1A of monopolar synchronous switch (K1) and output, pre-charge circuit (2) is connected in parallel between the input of the main contacts K2A of the two poles of the earth synchro switch (K2) and output, pre-charge circuit (3) is connected in parallel between the input of the main contacts K2B of the two poles of the earth synchro switch (K2) and output, grid line voltage is by described pre-charge circuit (1), described pre-charge circuit (2) and described pre-charge circuit (3) are to described Capacitor banks precharge, 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 place at zero point simultaneously, turn on and off the main contacts at described monopolar synchronous switch (K1) and described the two poles of the earth synchro switch (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 banks can connect into 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) three-phase power grid voltage is connected in series to Capacitor banks, wherein, three monopolar synchronous switch (K1, K2, pre-charge circuit (1 is connected in parallel respectively between the input of K3) respective main contacts and output, 2, 3), grid line voltage is by described pre-charge circuit (1, 2, 3) to described Capacitor banks precharge, phase control device is according to the phase angle of predetermined line voltage, at three monopolar synchronous switch (K1, K2, K3) voltage on respective main contacts and voltage change ratio are place at zero point simultaneously, turn on and off three monopolar synchronous switch (K1, K2, K3) main contacts, with opening-closing capacitor bank.
In above-mentioned a kind of execution mode, described three monopolar synchronous switches (K1, K2, K3) and described Capacitor banks connect into delta network form.
Described pre-charge circuit (1) is made up of the diode be connected in series (D1) and resistor (R1), and the negative electrode of diode (D1) is connected to the phase in line voltage; Described pre-charge circuit (2) is made up of the diode be 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 made up of the diode be connected in series (D3) and resistor (R3), and the anode of diode (D3) is connected to a phase again 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 resistor.
The phase angle of described predetermined line voltage is chosen as: when phase control device receives the input order of switching order S1, be connected in parallel the voltage peak point of the grid line voltage corresponding to the two poles of the earth synchro switch (K2) main contacts of described pre-charge circuit (2) and pre-charge circuit (3) and the voltage on this two main contactss and voltage change ratio be simultaneously zero point place, connect the main contacts at the two poles of the earth synchro switch (K2), be connected in parallel the voltage peak point of the electrical network phase voltage corresponding to described pre-charge circuit (1) monopolar synchronous switch (K1) main contacts and the voltage on this main contacts and voltage change ratio be simultaneously zero point place, 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 being connected in parallel the input corresponding to described pre-charge circuit (1) monopolar synchronous switch (K1) main contacts, namely be phase voltage peak point and voltage on this main contacts and voltage change ratio are place at zero point simultaneously, the main contacts of excision monopolar synchronous switch (K1), the phase place place of the grid line voltage when being connected in parallel the input corresponding to the two poles of the earth synchro switch (K2) main contacts of described pre-charge circuit (2) and pre-charge circuit (3), namely be the voltage peak point of grid line voltage and the voltage on this two main contactss and voltage change ratio be simultaneously zero point place, the main contacts of excision the two poles of the earth synchro switch (K2), line voltage is by pre-charge circuit (1), pre-charge circuit (2) and pre-charge circuit (3) charge to Capacitor banks.
Described monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) are the one in permanent magnet contactor or electromagnetic treadle.
Advantageous Effects of the present invention:
Device of the present invention is desirable opening-closing capacitor bank state, when opening-closing capacitor bank, switch was 1 ~ 6 second by closing, being opened to again closed operate time, compared the operate time of the synchro switch of the routine mentioned in background technology for minute level, greatly reduced.And, comprise and can reach no-flashy-flow opening-closing capacitor bank back-to-back, phenomenon of rarely or substantially not restriking, excellent electric switching effect can be obtained, there is splendid electric property.Compensation arrangement of the present invention adopts synchro switch, and switch is closed does not have energy consumption, and not needing in device to arrange discharge coil or discharge resistance, is green energy conservation.Device of the present invention is widely used in low pressure (below 1KV), middle pressure (1KV ~ 35KV), each current class of high pressure (> 35KV) occasion.
Accompanying drawing explanation
Fig. 1: according to the circuit diagram of an embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, form precharge fling-cut switch by one pole and two-photo pole switch, wherein Capacitor banks connects into star circuit form;
The voltage and current working waveform figure of the C1 of capacitor shown in Fig. 2: Fig. 1;
The voltage and current working waveform figure of the C2 of capacitor shown in Fig. 3: Fig. 1;
The voltage and current working waveform figure of the C3 of capacitor shown in Fig. 4: Fig. 1;
Fig. 5: according to the circuit diagram of second embodiment based on Synchronous Pre charge switch opening-closing capacitor bank device of the present invention, form precharge fling-cut switch by one pole and two-photo pole switch, wherein Capacitor banks connects into 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, precharge fling-cut switch is formed by one pole and two-photo pole switch, precharge synchro switch is arranged on the zero point of Capacitor banks, 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, precharge fling-cut switch is formed by one pole and two-photo pole switch, wherein Capacitor banks connects into delta network form, and precharge synchro switch is arranged in 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 switch composition precharge fling-cut switches, wherein Capacitor banks connects into 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, precharge fling-cut switch is formed by 3 single-pole switchs, precharge synchro switch is arranged on the zero point of Capacitor banks, 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, precharge fling-cut switch is formed by 3 single-pole switchs, wherein Capacitor banks connects into delta network form, and precharge synchro switch is arranged in 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, the input X1 of the main contacts K1A of monopolar synchronous switch (K1) is connected with three-phase power grid voltage U, V, W respectively with input X1, X3 of two main contactss K2A, K2B of the two poles of the earth synchro switch (K2), and the output X2 of the main contacts K1A of monopolar synchronous switch (K1) is connected with Capacitor banks respectively with output X2, X4 of main contacts K2A, K2B of the two poles of the earth synchro switch (K2).Wherein, pre-charge circuit (1) is connected in parallel between the input X1 of the main contacts K1A of monopolar synchronous switch (K1) and output X2, pre-charge circuit (2) is connected in parallel between the input X1 of a main contacts K2A of the two poles of the earth synchro switch (K2) and output X2, pre-charge circuit (3) is connected in parallel, grid line voltage U between the input X3 of another main contacts K2B of the two poles of the earth synchro switch (K2) and output X4
wUby described pre-charge circuit (3) and described pre-charge circuit (1) to described Capacitor banks C1, C3 precharge, grid line voltage U
vWby described pre-charge circuit (3) and described pre-charge circuit (2) to described Capacitor banks C2, C3 precharge, phase control device is according to the phase angle of predetermined line voltage, voltage on the main contacts K1A of monopolar synchronous switch (K1) and main contacts K2A, K2B of the two poles of the earth synchro switch (K2) and voltage change ratio are 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 made up of the diode be connected in series (D1) and resistor (R1), and the negative electrode of diode (D1) is connected to the U phase in line voltage; Described pre-charge circuit (2) is made up of the diode be 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 made up of the diode be connected in series (D3) and resistor (R3), and the anode of diode (D3) is connected 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 resistor.
When phase control device receives the input order of switching order S1, be connected in parallel pre-charge circuit (2) and pre-charge circuit (3) the two poles of the earth synchro switch (K2) main contacts K2A, K2B corresponding to grid line voltage U
vWvoltage peak point and voltage on this two main contactss and voltage change ratio are place at zero point simultaneously, connect the main contacts at the two poles of the earth synchro switch (K2), at the electrical network phase voltage U corresponding to the main contacts K1A of the monopolar synchronous switch (K1) being connected in parallel pre-charge circuit (1)
uvoltage peak point and voltage on this main contacts and voltage change ratio are 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, the electrical network phase voltage U when the input corresponding to the main contacts K1A of the monopolar synchronous switch (K1) being connected in parallel pre-charge circuit (1)
uphase place place, namely be phase voltage peak point and voltage on this main contacts and voltage change ratio are place at zero point simultaneously, excision monopolar synchronous switch (K1) main contacts, be connected in parallel pre-charge circuit (2) and pre-charge circuit (3) the two poles of the earth synchro switch (K2) main contacts K2A, K2B corresponding to input time grid line voltage U
vWphase place place, namely be the voltage peak point of grid line voltage and the voltage on this two main contactss and voltage change ratio be simultaneously zero point place, the main contacts of excision the two poles of the earth synchro switch (K2), line voltage is charged to Capacitor banks 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 K1 coil actuator 6 work, drive K2 coil, K1 coil, according to the phase angle of above-mentioned predetermined line voltage, closed the two poles of the earth synchro switch (K2) and monopolar synchronous switch (K1), Capacitor banks puts into operation again.
Fig. 2 ~ Fig. 4 respectively illustrates in Fig. 1 circuit with oscilloscope measurement, the working waveform figure of the voltage and current of capacitor C1, capacitor C2 and capacitor C3.As can be seen from Fig. 2, Fig. 3, Fig. 4, when every phase capacitor of three-phase condenser bank drops into, switch shoves not quite, and during excision, the voltage on capacitor can not exceed the peak value of electrical network phase voltage, and voltage value is little.This shows that the electric property of apparatus of the present invention is excellent, voltage, the current waveform of the Capacitor banks of measurement meet commercial Application.The frequency of electrical network is 50Hz, and a cycle is 20ms, and the oscillogram measured from Fig. 2, Fig. 3, Fig. 4 it can also be seen that the switch of opening-closing capacitor bank was less than for 1 second by closing, being opened to again closed operate time, meets the requirement of quick-switching action.
Citing below describes the selection of the main element adopted based on the device of Synchronous Pre charge switch opening-closing capacitor bank of the present invention.Application of installation of the present invention is when line voltage 10KV electric current 200A, monopolar synchronous K switch 1 adopts common monopole permanent magnet contactor, model is CKG4-250/12-DY (one pole) such as, 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) such as, diode D1, D2, D3 are diode of high-voltage silicon rectifier stack, diode D1, D2, D3 voltage is 60KV, electric current 1A, high-voltage and current-limitation resistor R1, R2, R3 of connecting with diode of high-voltage silicon rectifier stack 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 select permanent magnet contactor or electromagnetic treadle.
Connect pre-charge circuit 1 and connect pre-charge circuit 2 and the pre-charge circuit 3 of connecting that is made up of diode of high-voltage silicon rectifier stack D3 and high-voltage and current-limitation resistor R3 that are made up of diode of high-voltage silicon rectifier stack D2 and high-voltage and current-limitation resistor R2 that are made up of diode of high-voltage silicon rectifier stack D1 and high-voltage and current-limitation resistor R1 can exchange the position being connected in monopolar synchronous switch (K1) and the two poles of the earth synchro switch (K2) main contacts in parallel, as long as synchronous voltage signal does corresponding adjustment, control program is constant, and switching effect also can not be affected.
According to the principle about star circuit and delta network equivalent transformation in the principles of electric and electronic engineering, the filtering capacitor group be made up of three-phase reactor L and capacitor C can connect into star circuit form, also can connect into delta network form, which kind of type of attachment no matter reactor L and capacitor C adopt all to realize identical switching effect.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, different from the Capacitor banks of the star connection shown in Fig. 1, and in this embodiment, Capacitor banks uses 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 of the device based on Synchronous Pre charge switch opening-closing capacitor bank of circuit topological structure shown in Fig. 6.As shown in Figure 6, Capacitor banks is Y-connection, the input X1 of the main contacts K1A of monopolar synchronous switch (K1) and the main contacts K2A of the two poles of the earth synchro switch (K2), the input X1 of K2B, X3 is all connected to the place at zero point of Capacitor banks, the output X2 of the main contacts K1A of monopolar synchronous switch (K1) and the main contacts K2A of 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) forms the Zero-point switch of the star structure form of Capacitor banks, wherein be connected in parallel pre-charge circuit (1) between the input X1 of the main contacts K1A of monopolar synchronous switch (K1) and output X2, pre-charge circuit (2) is connected in parallel between the input X1 of the main contacts K2A of the two poles of the earth synchro switch (K2) and output X2, pre-charge circuit (3) is connected in parallel between the input X3 of the main contacts K2B of the two poles of the earth synchro switch (K2) and output X4, grid line voltage is by pre-charge circuit (1), pre-charge circuit (2) and pre-charge circuit (3) are to Capacitor banks precharge, 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 main contacts of the two poles of the earth synchro switch (K2) and voltage change ratio are 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, Capacitor banks is made up of the reactor and capacitor connecting into delta network form, the main contacts K1A of monopolar synchronous switch (K1) and the main contacts K2A of the two poles of the earth synchro switch (K2), K2B is arranged in delta network, be connected in series with Capacitor banks, wherein, pre-charge circuit (1) is connected in parallel between the input X1 of the main contacts K1A of monopolar synchronous switch (K1) and output X2, pre-charge circuit (2) is connected in parallel between the input X1 of the main contacts K2A of the two poles of the earth synchro switch (K2) and output X2, pre-charge circuit (3) is connected in parallel between the input X3 of the main contacts K2B of the two poles of the earth synchro switch (K2) and output X4.
In the above-described embodiments, a monopolar synchronous switch and two-stage synchro switch is adopted 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 the embodiment shown in Fig. 1, Fig. 6 and Fig. 7, just instead of the two poles of the earth synchro switch K2 with two single-pole switch K2 and K3.Control strategy adjusts accordingly.Phase control device is according to the phase angle of predetermined line voltage, voltage on the respective main contacts of monopolar synchronous switch (K1), monopolar synchronous switch (K2) and monopolar synchronous switch (K3) and voltage change ratio are 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 made detailed explanation to content of the present invention, for persons skilled in the art, to any apparent change that it does under the prerequisite not deviating from spirit and scope of the invention, all thinks open by the present invention.
Claims (9)
1. the device based on Synchronous Pre charge switch opening-closing capacitor bank, it is characterized in that: monopolar synchronous K switch 1 and the two poles of the earth synchro switch K2 and Capacitor banks are connected in series to three-phase power grid voltage, wherein, pre-charge circuit 1 is connected in parallel between the input of the main contacts K1A of monopolar synchronous K switch 1 and output, pre-charge circuit 2 is connected in parallel between the input of the main contacts K2A of the two poles of the earth synchro switch K2 and output, pre-charge circuit 3 is connected in parallel between the input of the main contacts K2B of the two poles of the earth synchro switch K2 and output, grid line voltage is by described pre-charge circuit 1, described pre-charge circuit 2 and described pre-charge circuit 3 give described Capacitor banks precharge, phase control device is according to the phase angle of predetermined line voltage, voltage on the main contacts of monopolar synchronous K switch 1 and the two poles of the earth synchro switch K2 and voltage change ratio are place at zero point simultaneously, turn on and off the main contacts of described monopolar synchronous K switch 1 and described the two poles of the earth synchro switch K2, with opening-closing capacitor bank, pre-charge circuit 1 is made up of the diode D1 be connected in series and resistor R1, the negative electrode of diode D1 is connected to the phase in line voltage, described pre-charge circuit 2 is made up of the diode D2 be connected in series and resistor R2, and the negative electrode of diode D2 is connected to another phase of line voltage, described pre-charge circuit 3 is made up of the diode D3 be connected in series and resistor R3, and the anode of diode D3 is connected to a phase again of line voltage.
2. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 1, is characterized in that: described monopolar synchronous K switch 1, the two poles of the earth synchro switch K2 and described Capacitor banks connect into delta network form.
3. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 1, is characterized in that: 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 resistor.
4. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 1, is characterized in that: described monopolar synchronous K switch 1 and the two poles of the earth synchro switch K2 are the one in permanent magnet contactor or electromagnetic treadle.
5. the device of the Synchronous Pre charge switch opening-closing capacitor bank according to any one of claim 1-4, 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 connected in parallel described pre-charge circuit 2 and pre-charge circuit 3 the two poles of the earth synchro switch K2 two main contactss corresponding to the voltage peak point of grid line voltage and the voltage on this two main contactss and voltage change ratio be simultaneously zero point place, connect the main contacts of the two poles of the earth synchro switch K2, the voltage peak point of electrical network phase voltage corresponding to the main contacts of the monopolar synchronous K switch 1 being connected in parallel described pre-charge circuit 1 and the voltage on this main contacts and voltage change ratio are place at zero point simultaneously, connect the main contacts of monopolar synchronous K switch 1, when phase control device receives the excision order of switching order S1, the phase place place of the electrical network phase voltage when the input corresponding to the main contacts of the monopolar synchronous K switch 1 being connected in parallel described pre-charge circuit 1, namely be phase voltage peak point and voltage on this main contacts and voltage change ratio are place at zero point simultaneously, the main contacts of excision monopolar synchronous K switch 1, be connected in parallel described pre-charge circuit 2 and pre-charge circuit 3 the two poles of the earth synchro switch K2 two main contactss corresponding to input time the phase place place of grid line voltage, namely be the voltage peak point of grid line voltage and the voltage on this two main contactss and voltage change ratio be simultaneously zero point place, the main contacts of excision the two poles of the earth synchro switch K2, line voltage is by described pre-charge circuit 1, pre-charge circuit 2 and pre-charge circuit 3 charge to Capacitor banks.
6. the device based on Synchronous Pre charge switch opening-closing capacitor bank, be characterised in that altogether: three monopolar synchronous K switch 1, K2, K3 and Capacitor banks are connected in series to three-phase power grid voltage, wherein, three monopolar synchronous K switch 1, K2, pre-charge circuit 1 is connected in parallel respectively between the input of K3 main contacts separately and output, 2, 3, grid line voltage is by described pre-charge circuit 1, 2, 3 give described Capacitor banks precharge, phase control device is according to the phase angle of predetermined line voltage, three monopolar synchronous K switch 1, K2, voltage on K3 main contacts separately and voltage change ratio are place at zero point simultaneously, turn on and off three monopolar synchronous K switch 1, K2, the main contacts of K3, with opening-closing capacitor bank, pre-charge circuit 1 is made up of the diode D1 be connected in series and resistor R1, the negative electrode of diode D1 is connected to the phase in line voltage, described pre-charge circuit 2 is made up of the diode D2 be connected in series and resistor R2, and the negative electrode of diode D2 is connected to another phase of line voltage, described pre-charge circuit 3 is made up of the diode D3 be connected in series and resistor R3, and the anode of diode D3 is connected to a phase again of line voltage.
7. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 6, is characterized in that: described three monopolar synchronous K switch 1, K2, K3 and described Capacitor banks connect into delta network form.
8. the device of Synchronous Pre charge switch opening-closing capacitor bank according to claim 6, is characterized in that: 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 resistor.
9. Synchronous Pre charge switch opening-closing capacitor bank device according to claim 6, is characterized in that: described three monopolar synchronous K switch 1, K2, K3 are the one in permanent magnet contactor or electromagnetic treadle.
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| CN105826927B (en) * | 2016-03-22 | 2018-12-14 | 广州开能电气实业有限公司 | A kind of corner connection capacitor group switching module |
| CN105680455B (en) * | 2016-03-22 | 2017-12-05 | 广州开能电气实业有限公司 | A kind of star connects the method for work of capacitor group switching module |
| CN107302221A (en) * | 2016-04-14 | 2017-10-27 | 北京馨容纵横科技发展有限公司 | A kind of simplifying for switched capacitor group is pre-charged simultaneous switching circuit |
| CN108448590A (en) * | 2018-04-11 | 2018-08-24 | 全球能源互联网研究院有限公司 | A kind of device, method and system for inhibiting shunt capacitor inrush phenomenon |
| CN109193694B (en) * | 2018-10-25 | 2021-10-29 | 许昌学院 | Low-voltage reactive power compensation system |
| US11105843B2 (en) | 2019-10-10 | 2021-08-31 | Analog Devices International Unlimited Company | Robust architecture for mode switching of a force and measure apparatus |
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