CN102593847B - Single tripolar synchronous switch-based intelligent reactive power compensation device - Google Patents
Single tripolar synchronous switch-based intelligent reactive power compensation device Download PDFInfo
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- CN102593847B CN102593847B CN201210066279.4A CN201210066279A CN102593847B CN 102593847 B CN102593847 B CN 102593847B CN 201210066279 A CN201210066279 A CN 201210066279A CN 102593847 B CN102593847 B CN 102593847B
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Abstract
The invention discloses a single tripolar synchronous switch-based intelligent reactive power compensation device, which is characterized in that: the input ends of main contacts of a tripolar synchronous switch K1 are connected with three phases of power grid voltages U, V and W respectively, and the output ends of the main contacts of the tripolar synchronous switch K1 are connected with a capacitor bank respectively; a pre-charging circuit 1 is connected in parallel between the input end and output end of a main contact; a pre-charging circuit 2 is connected in parallel between the input end and output end of another main contact; the line voltage of a power grid pre-charges the capacitor group through the pre-charging circuits 1 and 2; a phase control device switches on and switches off the three main contacts of the tripolar synchronous switch K1 at the same time according to the preset phase angle of the voltage of the power grid to switch the capacitor group. Experimental waves show that the device is good in switching electrical effect, environment-friendly, energy-saving, simple in structure, economical and practical, and can be conveniently applied to engineering in a large scale.
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 a kind of Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch 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: CN 101510689 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.: CN 101510689; 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 and realizes with two or three monopolar synchronous switches.The internationally famous company of power quality controlling comprises the synchro switch that ABB, Siemens, GE, Schneider, Alstom and each company domestic apply in engineering and is mostly made up of three monopolar synchronous switches.Three monopolar synchronous on-off ratio separate unit tri-level sync constructions of switch are complicated, and drive circuit is many, and every platform single-pole switch all needs independently switch coil and drive circuit, and driver' s timing is complicated.
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.: CN 1845456B 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.Meanwhile, this patent also proposed a kind of pre-charge circuit of mechanical switch.
Patent document " a kind of 2 control 3 precharge phased switch circuit of opening-closing capacitor bank ", authorize publication number: CN201378738Y, 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, and Control timing sequence is complicated.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.Although this patent proposes application precharge synchro switch quick non-impact current switched capacitor, the opening-closing capacitor bank technical scheme of obviously not shoving back-to-back, be adopt multiple stage monopolar synchronous switch to realize.
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 action fast, switching no-flashy-flow, seldom or not to restrike phenomenon, the Intelligent Reactive Compensation Equipment of green energy conservation, it can be applicable to each current class of low pressure, middle pressure, high pressure, and structure simple, economic and practical, be convenient to engineering widely apply, it is more simple more safe and reliable that engineering practice also demonstrates structure, and failure rate is fewer.
The present invention is a kind of Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch.The technical scheme of multiple stage monopolar synchronous switch difference opening-closing capacitor bank is used compared to existing technology, only adopt the synchro switch that three poles close simultaneously, open simultaneously, by application recharge technique and simultaneous techniques, realize reactive power compensation at this tri-level sync switch of phase angle switching of predetermined line voltage.In two pre-charge circuits, the polarity syndeton of diode is different from patent document " 2 of a kind of opening-closing capacitor bank controls 3 precharge phased switch circuit " (authorizing publication number: CN 201378738Y).The tri-level sync switch adopted is the mechanical switch that in engineering, a large amount of three poles used close simultaneously, open simultaneously.
The present invention is realized by following scheme:
The input of the main contacts of tri-level sync K switch 1 respectively with three-phase power grid voltage U, V, W is connected, the output of the main contacts of tri-level sync K switch 1 is connected with Capacitor banks respectively, pre-charge circuit 1 is connected in parallel between the input of one of them main contacts and output, pre-charge circuit 2 is connected in parallel between the input of another main contacts and output, grid line voltage gives described Capacitor banks precharge by described pre-charge circuit 1 and described pre-charge circuit 2, phase control device is according to the phase angle of predetermined line voltage, voltage on tri-level sync K switch 1 main contacts equal zero or voltage and voltage change ratio simultaneously close to locating zero point, connect simultaneously, turn off three main contactss of tri-level sync K switch 1 simultaneously, with opening-closing capacitor bank.
Pre-charge circuit 1 is made up of the diode D1 be connected in series and resistor R1, and the negative electrode of diode D1 is connected to the phase in line voltage; Pre-charge circuit 2 is made up of the diode D2 be connected in series and resistor R2, and the anode of diode D2 is connected to another phase of line voltage.
The phase angle of described predetermined line voltage is chosen as: at the voltage peak point of grid line voltage be connected in parallel corresponding to the main contacts of described pre-charge circuit 1, pre-charge circuit 2 and the voltage on this two main contactss and voltage change ratio simultaneously close to locating zero point, when another does not have the magnitude of voltage zero crossing of the electrical network phase voltage corresponding to the main contacts of pre-charge circuit in parallel and the magnitude of voltage on this main contacts equals zero, connect simultaneously, turn off simultaneously three main contactss of tri-level sync K switch 1.After 1 to 6 seconds, when again receiving switching order S1 close command, according to the phase angle of above-mentioned predetermined line voltage, tri-level sync K switch 1 closes, and Capacitor banks reruns work.
Tri-level sync K switch 1 is the one in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and electromagnetic breaker.
According to the principle of the principles of electric and electronic engineering about star circuit and delta network equivalent transformation, described Capacitor banks is made up of the reactor L and capacitor C connecting into star circuit form or delta network form, and switching effect is constant.
According to the principle that the element front and back position of principles of electric and electronic engineering series circuit can change, tri-level sync K switch 1 can be exchanged with the position of Capacitor banks, Capacitor banks connects for star circuit form, the input of three main contactss of tri-level sync K switch 1 is all connected to the place at zero point of Capacitor banks, pre-charge circuit 3 is connected in parallel between the input of wherein two main contactss of tri-level sync K switch 1, phase control device is according to the phase angle of predetermined line voltage, voltage on tri-level sync K switch 1 main contacts equal zero or voltage and voltage change ratio simultaneously close to locating zero point, connect simultaneously, turn off three main contactss of tri-level sync K switch 1 simultaneously, with opening-closing capacitor bank.
Pre-charge circuit 3 is made up of the diode D1 be connected in series and resistor R1.
The phase angle of described predetermined line voltage is chosen as: at the voltage peak point of the grid line voltage corresponding to the two ends of pre-charge circuit 3 and the voltage on this two main contactss and voltage change ratio simultaneously close to locating zero point, the magnitude of voltage zero crossing of the electrical network phase voltage corresponding to the main contacts that another does not have a pre-charge circuit in parallel, connects simultaneously, turns off simultaneously three main contactss of tri-level sync K switch 1.
According to the principle of the principles of electric and electronic engineering about star circuit and delta network equivalent transformation, three main contactss of described tri-level sync K switch 1 connect into delta network or star circuit form, and switching effect is constant.
Described tri-level sync K switch 1 is the one in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and electromagnetic breaker.
Advantageous Effects of the present invention:
Through experiment, device of the present invention is when opening-closing capacitor bank, and switch was 1 ~ 6 second by closing, being opened to again closed operate time, compared the switching time of minute level of the synchro switch mentioned in background technology, greatly reduced.And, can fast, no-flashy-flow opening-closing capacitor bank, phenomenon of rarely or substantially not restriking, can obtain excellent electric switching effect, have 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.Three pole mechanical switchs are widely used in low pressure (below 1KV), middle pressure (1KV ~ 35KV), each current class of high pressure (> 35KV) occasion,
Therefore, Intelligent Reactive Compensation Equipment of the present invention, owing to using these type of can three pole mechanical switchs of Synchronization Control, also can be suitable for various electric pressure and the application of each current class.In addition, compared with adopting the other technologies scheme of the opening-closing capacitor bank such as synchro switch, combination switch, thyristor switch in prior art, the component number that the solution of the present invention adopts obviously reduces, because this simplify circuit structure, save installing space, economic and practical, user is acceptant, be convenient to engineering widely apply, it is more simple more safe and reliable that engineering practice also demonstrates structure, and failure rate is fewer.
Accompanying drawing explanation
Fig. 1: according to the circuit diagram of an embodiment of the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch of the present invention, 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 another embodiment of the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch of the present invention, wherein Capacitor banks connects into delta network form;
Fig. 6: according to the circuit diagram of an embodiment again of the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch of the present invention, tri-level sync switch is arranged on the zero point of Capacitor banks, and wherein the main contacts of tri-level sync switch connects into triangular form;
Fig. 7: according to the circuit diagram of the another embodiment of the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch of the present invention, tri-level sync switch is arranged on the zero point of Capacitor banks, and wherein the main contacts of tri-level sync switch connects into star form.
Embodiment
Fig. 1 describes according to the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch of the present invention, three main contacts K1A of tri-level sync K switch 1, K1B, the input X1 of K1C, X3, X5 respectively with three-phase power grid voltage U, V, W is connected, three main contacts K1A of tri-level sync K switch 1, K1B, the output X2 of K1C, X4, X6 is connected with Capacitor banks respectively, wherein, pre-charge circuit 1 is connected in parallel between the input X1 of main contacts K1A and output X2, pre-charge circuit 2 is connected in parallel between the input X3 of another main contacts K1B and output X4, grid line voltage U
uVdescribed Capacitor banks precharge is given by described pre-charge circuit 1 and described pre-charge circuit 2, phase control device is according to the phase angle of predetermined line voltage, voltage on tri-level sync K switch 1 main contacts equal zero or voltage and voltage change ratio simultaneously close to locating zero point, connect simultaneously, turn off simultaneously three main contactss of tri-level sync K switch 1, with opening-closing capacitor bank.
The two ends of the main contacts K1A of tri-level sync K switch 1 are connected in parallel the pre-charge circuit 1 of connecting be made up of diode of high-voltage silicon rectifier stack D1 and high-voltage and current-limitation resistor R1, and the negative electrode of diode of high-voltage silicon rectifier stack D1 is connected to the U phase of line voltage; The two ends of the main contacts K1B of tri-level sync K switch 1 are connected in parallel the pre-charge circuit 2 of connecting be made up of diode of high-voltage silicon rectifier stack D2 and high-voltage and current-limitation resistor R2, and the anode of diode of high-voltage silicon rectifier stack D2 is connected to the V phase of line voltage, grid line voltage U
uVby series connection pre-charge circuit 1 and connect pre-charge circuit 2 couples of capacitor C1 and capacitor C2 precharge.
Phase control device is made up of line voltage synchronizing indicator 4, phase controller 5 and K1 coil actuator 6.The circuit of phase control device is similar to the control circuit of the conventional synchronous switch that the art uses, for those skilled in the art is understood, so do not repeat.Phase control device is according to the phase angle of predetermined line voltage, voltage on the main contacts K1C of tri-level sync K switch 1 equals zero, the voltage of main contacts K1A, main contacts K1B and voltage change ratio are simultaneously close to locating zero point, connect simultaneously, turn off simultaneously three main contactss of tri-level sync K switch 1, carry out opening-closing capacitor bank.Namely when receiving switching order S1 close command, line voltage synchronizing indicator 4, phase controller 5 and K1 coil actuator 6 work, and drive K1 coil, in grid line voltage U
uVnegative peak point, closed tri-level sync K switch 1, realizes Capacitor banks no current and impacts and devote oneself to work; When receiving switching order S1 halt instruction, line voltage synchronizing indicator 4, phase controller 5 and K1 coil actuator 6 work, and drive K1 coil, in grid line voltage U
uVnegative peak point, open tri-level sync K switch 1.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 K1 coil, according to the phase angle of above-mentioned predetermined line voltage, closed tri-level sync K switch 1, Capacitor banks puts into operation again.
Fig. 2 ~ Fig. 4 respectively illustrates the working waveform figure of the voltage and current of capacitor C1, capacitor C2 and capacitor C3 shown in the Fig. 1 with oscilloscope measurement.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, the capacitor bank voltage current waveform of measurement meets 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 that reactive power compensator of the present invention adopts.When reactive power compensator of the present invention is applied to line voltage 10KV electric current 200A, tri-level sync K switch 1 adopts common three pole permanent magnet contactors, model is CKG4-250/12-DY (three pole) such as, diode D1, D2 are diode of high-voltage silicon rectifier stack, diode D1, D2 voltage is 60KV, electric current 1A, and high-voltage and current-limitation resistor R1, R2 of connecting with diode of high-voltage silicon rectifier stack D1, D2 are 12KV, 10K ohm, the high-tension resistive of 500W.
Tri-level sync K switch 1 is the one in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and electromagnetic breaker.Three poles of the main contacts of tri-level sync K switch 1 close simultaneously opens simultaneously, does not control closed opening respectively.As long as meeting synchronous control accuracy requires just passable.
Connect pre-charge circuit 1 and the pre-charge circuit 2 of connecting that is 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 be connected in parallel on any the two poles of the earth of tri-level sync K switch 1 main contacts, the position of series connection pre-charge circuit 1 and series connection pre-charge circuit 2 can also be exchanged, 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.Fig. 5 shows the circuit diagram of another embodiment according to the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch of the present invention, and wherein Capacitor banks uses delta connection.
The principle that can change according to the element front and back position of series circuit in the principles of electric and electronic engineering and the principle of star circuit and delta network equivalent transformation, the present invention also proposes the Intelligent Reactive Compensation Equipment of structure shown in Fig. 6, Fig. 7.As shown in Figure 6, Capacitor banks is Y-connection, and input X1, X3, X5 of main contacts K1A, K1B, K1C of tri-level sync K switch 1 are all connected to the place at zero point of the Capacitor banks of Y-connection.Main contacts K1A, K1B, K1C of tri-level sync K switch 1 connect into delta network.In this circuit structure, pre-charge circuit 3 is connected in parallel between the input X1 of the main contacts K1A of tri-level sync the K switch 1 and input X3 of main contacts K1B, pre-charge circuit 3 is made up of the diode D1 be connected in series and resistor R1, the anode of diode D1 is connected on capacitor C2, and switching effect is constant.The difference of circuit shown in Fig. 7 and Fig. 6 is only that three main contactss K1A, K1B, K1C of tri-level sync switch connect into star form.
The grid line voltage U of phase control device corresponding to the two ends of pre-charge circuit 3
uVvoltage peak point and voltage on main contacts K1A and K1B and voltage change ratio simultaneously close to locating zero point, the magnitude of voltage zero crossing of the electrical network phase voltage corresponding to the main contacts K1C that another does not have a pre-charge circuit in parallel, connects simultaneously, turns off simultaneously three main contactss of tri-level sync K switch 1.
It should be noted, although the pre-charge circuit 3 of Fig. 6 and Fig. 7 display is connected in parallel between the input X1 of main contacts K1A and the input X3 of main contacts K1B, but it also can be connected in parallel between the input of any two main contactss in three main contactss, synchronous voltage signal is only needed to be adjusted accordingly, control program is constant, and switching effect also can not be affected.
Specific embodiment of the present invention has made detailed explanation to content of the present invention, for persons skilled in the art, without departing from the premise in the spirit of the present invention to any apparent change that it does, all form infringement of patent right of the present invention, corresponding legal liabilities will be born.
Claims (8)
1. the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch, it is characterized in that: the input of the main contacts of tri-level sync K switch 1 is connected with three-phase power grid voltage respectively, the output of the main contacts of tri-level sync K switch 1 is connected with Capacitor banks respectively, pre-charge circuit 1 is connected in parallel between the input of one of them main contacts and output, pre-charge circuit 2 is connected in parallel between the input of another main contacts and output, grid line voltage gives described Capacitor banks precharge by described pre-charge circuit 1 and described pre-charge circuit 2, phase control device is according to the phase angle of predetermined line voltage, voltage on tri-level sync K switch 1 main contacts equal zero or voltage and voltage change ratio simultaneously close to locating zero point, connect simultaneously, turn off three main contactss of tri-level sync K switch 1 simultaneously, with opening-closing capacitor bank, wherein, described 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 anode of diode D2 is connected to another phase of line voltage.
2. Intelligent Reactive Compensation Equipment according to claim 1, it is characterized in that: the phase angle of described predetermined line voltage is chosen as: be connected in parallel the voltage peak point of the grid line voltage corresponding to the main contacts of described pre-charge circuit 1 and pre-charge circuit 2 and the voltage on this two main contactss and voltage change ratio simultaneously close to locating zero point, when another does not have the magnitude of voltage zero crossing of the electrical network phase voltage corresponding to the main contacts of pre-charge circuit in parallel and the magnitude of voltage on this main contacts equals zero, connect simultaneously, turn off three main contactss of tri-level sync K switch 1 simultaneously.
3. Intelligent Reactive Compensation Equipment according to claim 1, is characterized in that: described tri-level sync K switch 1 is the one in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and electromagnetic breaker.
4. the Intelligent Reactive Compensation Equipment according to any one of claim 1-3, is characterized in that: described Capacitor banks is made up of the reactor and capacitor connecting into star circuit form or delta network form.
5. the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch, it is characterized in that: Capacitor banks connects for star circuit form, the input of three main contactss of tri-level sync K switch 1 is all connected to the place at zero point of Capacitor banks, pre-charge circuit 3 is connected in parallel between the input of wherein two main contactss of tri-level sync K switch 1, phase control device is according to the phase angle of predetermined line voltage, voltage on tri-level sync K switch 1 main contacts equal zero or voltage and voltage change ratio simultaneously close to locating zero point, connect simultaneously, turn off three main contactss of tri-level sync K switch 1 simultaneously, with opening-closing capacitor bank, wherein, described pre-charge circuit 3 is made up of the diode D1 be connected in series and resistor R1.
6. Intelligent Reactive Compensation Equipment according to claim 5, it is characterized in that: the phase angle of described predetermined line voltage is chosen as: at the voltage peak point of the grid line voltage corresponding to the two ends of described pre-charge circuit 3 and the voltage on this two main contactss and voltage change ratio simultaneously close to locating zero point, the magnitude of voltage zero crossing of the electrical network phase voltage corresponding to the main contacts that another does not have a pre-charge circuit in parallel, connects simultaneously, turns off simultaneously three main contactss of tri-level sync K switch 1.
7. Intelligent Reactive Compensation Equipment according to claim 5, is characterized in that: three main contactss of described tri-level sync K switch 1 connect into delta network or star circuit form.
8. Intelligent Reactive Compensation Equipment according to claim 5, is characterized in that: described tri-level sync K switch 1 is the one in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and electromagnetic breaker.
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| CN104052110A (en) * | 2014-05-30 | 2014-09-17 | 安徽三和电力技术有限公司 | Pre-charging circuit of single three-pole synchronous switch reactive compensation device |
| CN104578093B (en) * | 2014-12-09 | 2017-01-11 | 江苏南自通华电力自动化有限公司 | Phase-controlled switch peak zero-cross-switching inrush current control circuit and control method |
| 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 |
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| CN102593847A (en) | 2012-07-18 |
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