CN102593847A - 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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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 reactive power compensation, harmonic and the electrical network power quality controlling field of electric power system, relate to a kind of Intelligent Reactive Compensation Equipment particularly based on separate unit tri-level sync switch.
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 80% to use the mechanical contact switch switched capacitor approximately; Mechanical contact switch is a triple-pole switch, and three main contactss of triple-pole switch are closed simultaneously, 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 have combined floodgate mechanical contact spring, open the dangerous probability of restriking in the contact, bouncing and restriking makes capacitor group overvoltage, damages capacitor, causes the accident easily.And still have the reason of mass market occupation rate with the mechanical contact switch switched capacitor is that its circuit is simple, and cost is low.
It is found that zero crossing close switch afterwards, and opened switch at current zero-crossing point and come switched capacitor obviously to reduce impulse current, alleged synchro switch technology that Here it is at line voltage.Because the capacitor group is a capacitive load, when electric current was zero opening, line voltage was a peak value; Crest voltage can be kept on the capacitor; When close switch drops into the capacitor group once more, at first need generally adopt discharge coil on the engineering with the charge discharge that stores on the capacitor to zero.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,, be generally a minute level so the switch of opening-closing capacitor bank is long by operate time closed, that be opened to once more closure.Utilize existing synchro switch technology back-to-back during opening-closing capacitor bank, capacitor shoves greatly.
Three utmost point mechanical contact switch are closed simultaneously to be developed with the shortcoming of opening the existence of capacitor group synchro switch in order to overcome.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 that is used to control the three-phase power capacitor switching ", application number: 201010591708.0 etc., all talk about synchro switch with two or three monopolar synchronous switches realizations.The internationally famous company of power quality controlling comprises that the synchro switch that ABB, Siemens, GE, Schneider, Alstom and domestic each company use is made up of three monopolar synchronous switches mostly in engineering.Three monopolar synchronous on-off ratio separate unit tri-level sync constructions of switch are complicated, and drive circuit is many, and every single-pole switch all needs independently switch coil and drive circuit, the driving complex time.
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, and combination switch is owing to will use thyristor; So it is more than the simple used number of elements of mechanical switch that adopts; Control timing is compared simple employing mechanical switch and is wanted complicated, and parallelly connected combination switch tends to run into mechanical switch and opens on the practical applications, 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 of parallel connection, as hanging down the high withstand voltage switch of precision at a slow speed, 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, the technical barrier that damages easily.Simultaneously, this patent has also proposed a kind of pre-charge circuit of mechanical switch.
Patent document " a kind of 2 controls, 3 precharge phased switch circuit of opening-closing capacitor bank "; Authorize publication number: CN201378738Y; 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, and control timing is complicated.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 RC and has absorbed circuit.Though this patent has proposed the quick non-impact current switched capacitor of application precharge synchro switch, the opening-closing capacitor bank technical scheme of obviously not shoving back-to-back,, be to adopt many monopolar synchronous switches to realize.
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 thyristor series connection, 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 big caloric requirement is dispelled the heat by equipment such as air-cooled, water-cooled, heat pipes.Because the TSC technical difficulty is big, energy consumption is big, 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 overcomes inferior position wherein; Proposed a kind of action fast, switching no-flashy-flow, the few or phenomenon of not restriking; 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 simple in structure, economic and practical, be convenient to engineering and widely apply; Engineering practice has proved that also structure is safe and reliable more simply more, and failure rate is few more.
The present invention is a kind of Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch.Compare and use many monopolar synchronous switches to come the technical scheme of opening-closing capacitor bank respectively in the prior art; Only adopt the synchro switch that one three utmost point is closed simultaneously, open simultaneously; Through using precharge technology and simultaneous techniques, this tri-level sync switch of switching is realized reactive power compensation at the phase angle of predetermined grid voltage.In two pre-charge circuits, the polarity syndeton of diode and patent document " a kind of 2 controls, 3 precharge phased switch circuit of opening-closing capacitor bank " (mandate publication number: CN 201378738Y) different.The tri-level sync switch that is adopted is a large amount of three utmost points while closures of using, the mechanical switch of opening simultaneously on the engineering.
The present invention realizes through following scheme:
The input of the main contacts of tri-level sync K switch 1 is connected with three phase network voltage U, V, W respectively; The output of the main contacts of tri-level sync K switch 1 is connected with the capacitor group respectively; Pre-charge circuit 1 is being connected in parallel between the input of one of them main contacts and the output; Pre-charge circuit 2 is being connected in parallel between the input of another main contacts and the output; Grid line voltage is given the precharge of said capacitor group through said pre-charge circuit 1 and said pre-charge circuit 2, and phase control device is according to the phase angle of predetermined grid voltage, the voltage on tri-level sync K switch 1 main contacts equal zero or voltage and voltage change ratio while near locating zero point; Connect simultaneously, turn-off three main contactss of tri-level sync K switch 1 simultaneously, with opening-closing capacitor bank.
The phase angle of said predetermined grid voltage is chosen as: at the voltage peak point of the pairing grid line voltage of main contacts of be connected in parallel said pre-charge circuit 1, pre-charge circuit 2 and the voltage on this two main contactss and voltage change ratio simultaneously near locating zero point; When another does not have magnitude of voltage zero crossing and the magnitude of voltage on this main contacts of the pairing electrical network phase voltage of main contacts of parallelly connected pre-charge circuit to equal zero, connect, turn-off simultaneously three main contactss of tri-level sync K switch 1 simultaneously.After 1 to 6 second, when receiving switching order S1 close command once more, according to the phase angle of above-mentioned predetermined grid voltage, tri-level sync K switch 1 closure, the capacitor group reruns work.
Tri-level sync K switch 1 is a kind of in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and the electromagnetic breaker.
According to the principle of the principles of electric and electronic engineering about star circuit and delta network equivalent transformation, said capacitor group is made up of reactor L that connects into star circuit form or delta network form and capacitor C, and the switching effect is constant.
The principle that can change according to the element front and back position of principles of electric and electronic engineering series circuit; The position of tri-level sync K switch 1 and capacitor group can exchange; The capacitor group is connected to the star circuit form; The input of three main contactss of tri-level sync K switch 1 all is connected the place at zero point of capacitor group; The pre-charge circuit 3 that is being connected in parallel between the input of wherein two main contactss of tri-level sync K switch 1, phase control device be according to the phase angle of predetermined grid voltage, the voltage on tri-level sync K switch 1 main contacts equal zero or voltage and voltage change ratio while near locating zero point; Connect simultaneously, turn-off three main contactss of tri-level sync K switch 1 simultaneously, with opening-closing capacitor bank.
The phase angle of said predetermined grid voltage is chosen as: at the voltage peak point of the pairing grid line voltage in the two ends of pre-charge circuit 3 and the voltage on this two main contactss and voltage change ratio simultaneously near locating zero point; Do not have the magnitude of voltage zero crossing of the pairing electrical network phase voltage of main contacts of parallelly connected pre-charge circuit at another, connect, turn-off simultaneously three main contactss of tri-level sync K switch 1 simultaneously.
According to the principle of the principles of electric and electronic engineering about star circuit and delta network equivalent transformation, three main contactss of said tri-level sync K switch 1 connect into delta network or star circuit form, and the switching effect is constant.
Said tri-level sync K switch 1 is a kind of in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and the electromagnetic breaker.
Useful technique effect of the present invention:
Through experiment, device of the present invention when opening-closing capacitor bank, switch by closed, to be opened to closed once more operate time be 1～6 second, compares the switching time of minute level of the synchro switch of mentioning in the background technology, reduce greatly.And, can be fast, the no-flashy-flow opening-closing capacitor bank, the little or phenomenon of not restriking basically 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, discharge coil or discharge resistance need be set in the device, is green energy conservation.Three utmost point mechanical switchs are widely used in low pressure (1KV below), middle pressure (1KV～35KV), high pressure (＞35KV) each current class of occasion,
Therefore, but Intelligent Reactive Compensation Equipment of the present invention also can be suitable for various electric pressures and use with each current class owing to use three utmost point mechanical switchs of this type of Synchronization Control.In addition, compare with the other technologies scheme of opening-closing capacitor bank such as available technology adopting synchro switch, combination switch, thyristor switch, the component number that scheme of the present invention adopts obviously reduces; Therefore simplify circuit structure, saved installing space, economic and practical; User easier is accepted; Be convenient to engineering and widely apply, engineering practice has proved that also structure is safe and reliable more simply more, and failure rate is few more.
Description of drawings
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 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: 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 the capacitor group connects into the 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, the tri-level sync switch is installed in the zero point of capacitor group, 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, the tri-level sync switch is installed in the zero point of capacitor group, and wherein the main contacts of tri-level sync switch connects into star form.
Embodiment
Fig. 1 has described according to the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch of the present invention; The input X1 of three main contacts K1A of tri-level sync K switch 1, K1B, K1C, X3, X5 are connected with three phase network voltage U, V, W respectively; The output X2 of three main contacts K1A of tri-level sync K switch 1, K1B, K1C, X4, X6 are connected with the capacitor group respectively; Wherein, The pre-charge circuit 1 that is being connected in parallel between the input X1 of main contacts K1A and the output X2, the pre-charge circuit 2 that is being connected in parallel between the input X3 of another main contacts K1B and the output X4, grid line voltage U
UVGive the precharge of said capacitor group through said pre-charge circuit 1 and said pre-charge circuit 2; Phase control device is according to the phase angle of predetermined grid voltage; Voltage on tri-level sync K switch 1 main contacts equal zero or voltage and the voltage change ratio while near locating zero point; Connect simultaneously, turn-off three main contactss of tri-level sync K switch 1 simultaneously, with opening-closing capacitor bank.
The pre-charge circuit 1 of connecting that the two ends of the main contacts K1A of tri-level sync K switch 1 are being connected in parallel and are being made up of high voltage silicon stack diode D1 and high-voltage and current-limitation resistor R 1, the negative electrode of high voltage silicon stack diode D1 is connected to the U phase of line voltage; The pre-charge circuit 2 of connecting that the two ends of the main contacts K1B of tri-level sync K switch 1 are being connected in parallel and are being made up of high voltage silicon stack diode D2 and high-voltage and current-limitation resistor R 2, the anode of high voltage silicon stack diode D2 is connected to the V phase of line voltage, grid line voltage U
UVThrough series connection pre-charge circuit 1 and series connection 2 couples of capacitor C1 of pre-charge circuit 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 with the control circuit of the conventional synchro switch that use in the present technique field, for those skilled in the art is understood, so do not give unnecessary details.Phase control device is according to the phase angle of predetermined grid 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 near locating zero point; Connect simultaneously, turn-off three main contactss of tri-level sync K switch 1 simultaneously, come opening-closing capacitor bank.Promptly when receiving switching order S1 close command, line voltage synchronizing indicator 4, phase controller 5 and 6 work of K1 coil actuator drive the K1 coil, in the grid line voltage U
UVThe negative peak point, closed tri-level sync K switch 1 realizes that capacitor group no current impacts to devote oneself to work; When receiving switching order S1 halt instruction, line voltage synchronizing indicator 4, phase controller 5 and 6 work of K1 coil actuator drive the K1 coil, in the grid line voltage U
UVThe negative peak point, open tri-level sync K switch 1.After 1～6 second, when receiving switching order S1 close command once more, line voltage synchronizing indicator 4, phase controller 5 and 6 work of K1 coil actuator; Drive the K1 coil; According to the phase angle of above-mentioned predetermined grid voltage, closed tri-level sync K switch 1, the capacitor group puts into operation again.
Fig. 2～Fig. 4 shows the working waveform figure with the voltage and current of capacitor C1 shown in Figure 1, capacitor C2 and the capacitor C3 of oscilloscope measurement respectively.Can find out that from Fig. 2, Fig. 3, Fig. 4 when every phase capacitor of three-phase condenser bank dropped into, switch work was 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 the capacitor group voltage current waveform of measurement satisfies 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 closed once more operate time less than 1 second, satisfy the requirement of quick switching action.
The selection of the main element of describing reactive power compensator of the present invention for example below and being adopted.When reactive power compensator of the present invention was applied to line voltage 10KV electric current 200A, tri-level sync K switch 1 adopted common three utmost point permanent magnet contactors, and model is CKG4-250/12-DY (three utmost points) for example; Diode D1, D2 are the high voltage silicon stack diode; Diode D1, D2 voltage are 60KV, electric current 1A, and the high-voltage and current-limitation resistor R 1, the R2 that connect with high voltage silicon stack diode D1, D2 are 12KV; 10K ohm, the high-tension resistive of 500W.
Tri-level sync K switch 1 is a kind of in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and the electromagnetic breaker.Three utmost points of the main contacts of tri-level sync K switch 1 are that closure is opened simultaneously simultaneously, do not control closure respectively and open.As long as satisfying synchronous control accuracy requires just passable.
The pre-charge circuit of forming by high voltage silicon stack diode D1 and high-voltage and current-limitation resistor R 11 and can be connected in parallel on any the two poles of the earth of tri-level sync K switch 1 main contacts with the pre-charge circuit 2 of connecting that high-voltage and current-limitation resistor R 2 is formed of connecting by high voltage silicon stack diode D2; Can also exchange the position of series connection pre-charge circuit 1 and series connection pre-charge circuit 2; As long as synchronous voltage signal is done corresponding 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 of being made up 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.Fig. 5 shows the circuit diagram according to another embodiment of the Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch of the present invention, and wherein the capacitor group is used 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 Fig. 6, structure shown in Figure 7.As shown in Figure 6, the capacitor group is Y-connection, and the input X1 of the main contacts K1A of tri-level sync K switch 1, K1B, K1C, X3, X5 all are connected to the place at zero point of the capacitor group of Y-connection.The main contacts K1A of tri-level sync K switch 1, K1B, K1C connect into delta network.In the sort circuit structure; Pre-charge circuit 3 is being connected in parallel between the input X1 of the main contacts K1A of tri-level sync K switch 1 and the input X3 of main contacts K1B; Pre-charge circuit 3 is made up of diode D1 that is connected in series and resistor R 1; The anode of diode D1 is connected on the capacitor C2, and the switching effect is constant.The difference of circuit shown in Figure 7 and Fig. 6 only is that three main contacts K1A, K1B, K1C of tri-level sync switch connect into star form.
Phase control device is pairing grid line voltage U at the two ends of pre-charge circuit 3
UVVoltage peak point and the voltage on main contacts K1A and the K1B and voltage change ratio simultaneously near locating zero point; Do not have the magnitude of voltage zero crossing of the pairing electrical network phase voltage of main contacts K1C of parallelly connected pre-charge circuit at another, connect, turn-off simultaneously three main contactss of tri-level sync K switch 1 simultaneously.
It should be noted; Although the pre-charge circuit 3 that Fig. 6 and Fig. 7 show is connected in parallel between the input X3 of input X1 and main contacts K1B of main contacts K1A; But it also can be connected in parallel between the input of any two main contactss in three main contactss; Only need synchronous voltage signal be done corresponding adjustment, control program is constant, and the switching effect can not be affected yet.
Specific embodiment of the present invention has been made detailed explanation to content of the present invention; As far as persons skilled in the art; Any conspicuous change of under the prerequisite that does not deviate from spirit of the present invention, it being done; All constitute to infringement of patent right of the present invention, with corresponding legal responsibilities.
Claims (10)
1. 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 switch (K1) is connected with three phase network voltage respectively; The output of the main contacts of tri-level sync switch (K1) is connected with the capacitor group respectively; Pre-charge circuit (1) is being connected in parallel between the input of one of them main contacts and the output; Pre-charge circuit (2) is being connected in parallel between the input of another main contacts and the output; Grid line voltage is given the precharge of said capacitor group through said pre-charge circuit (1) and said pre-charge circuit (2), and phase control device is according to the phase angle of predetermined grid voltage, the voltage on tri-level sync switch (K1) main contacts equal zero or voltage and voltage change ratio while near locating zero point; Connect, turn-off simultaneously three main contactss of tri-level sync switch (K1) simultaneously, with opening-closing capacitor bank.
2. Intelligent Reactive Compensation Equipment according to claim 1 is characterized in that: said pre-charge circuit (1) is made up of 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; Said pre-charge circuit (2) is made up of diode that is connected in series (D2) and resistor (R2), and the anode of diode (D2) is connected to another phase of line voltage.
3. Intelligent Reactive Compensation Equipment according to claim 1; It is characterized in that: the phase angle of said predetermined grid voltage is chosen as: at the voltage peak point of the pairing grid line voltage of main contacts of be connected in parallel said pre-charge circuit (1) and pre-charge circuit (2) and the voltage on this two main contactss and voltage change ratio simultaneously near locating zero point; When another does not have magnitude of voltage zero crossing and the magnitude of voltage on this main contacts of the pairing electrical network phase voltage of main contacts of parallelly connected pre-charge circuit to equal zero, connect, turn-off simultaneously three main contactss of tri-level sync switch (K1) simultaneously.
4. Intelligent Reactive Compensation Equipment according to claim 1 is characterized in that: said tri-level sync switch (K1) is a kind of in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and the electromagnetic breaker.
5. according to each described Intelligent Reactive Compensation Equipment among the claim 1-4, it is characterized in that: said capacitor group is made up of the reactor and the capacitor that connect into star circuit form or delta network form.
6. Intelligent Reactive Compensation Equipment based on separate unit tri-level sync switch; It is characterized in that: the capacitor group is connected to the star circuit form; The input of three main contactss of tri-level sync switch (K1) all is connected the place at zero point of capacitor group; The pre-charge circuit (3) that is being connected in parallel between the input of wherein two main contactss of tri-level sync switch (K1), phase control device be according to the phase angle of predetermined grid voltage, the voltage on tri-level sync switch (K1) main contacts equal zero or voltage and voltage change ratio while near locating zero point; Connect, turn-off simultaneously three main contactss of tri-level sync switch (K1) simultaneously, with opening-closing capacitor bank.
7. Intelligent Reactive Compensation Equipment according to claim 6 is characterized in that: said pre-charge circuit (3) is made up of diode that is connected in series (D1) and resistor (R1).
8. Intelligent Reactive Compensation Equipment according to claim 6; It is characterized in that: the phase angle of said predetermined grid voltage is chosen as: at the voltage peak point of the pairing grid line voltage in the two ends of said pre-charge circuit (3) and the voltage on this two main contactss and voltage change ratio simultaneously near locating zero point; Do not have the magnitude of voltage zero crossing of the pairing electrical network phase voltage of main contacts of parallelly connected pre-charge circuit at another, connect, turn-off simultaneously three main contactss of tri-level sync switch (K1) simultaneously.
9. Intelligent Reactive Compensation Equipment according to claim 6 is characterized in that: three main contactss of said tri-level sync switch (K1) connect into delta network or star circuit form.
10. Intelligent Reactive Compensation Equipment according to claim 6 is characterized in that: said tri-level sync switch (K1) is a kind of in permanent magnet contactor, permanent-magnet breaker, electromagnetic treadle and the electromagnetic breaker.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN104578093A (en) * | 2014-12-09 | 2015-04-29 | 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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| 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 |
| CN104578093A (en) * | 2014-12-09 | 2015-04-29 | 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 |
| 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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| CN102593847B (en) | 2015-06-24 |
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