CN104979837A - Two-control-over-three simplified pre-charge synchronous switch circuit of switched capacitor - Google Patents
Two-control-over-three simplified pre-charge synchronous switch circuit of switched capacitor Download PDFInfo
- Publication number
- CN104979837A CN104979837A CN201510351320.6A CN201510351320A CN104979837A CN 104979837 A CN104979837 A CN 104979837A CN 201510351320 A CN201510351320 A CN 201510351320A CN 104979837 A CN104979837 A CN 104979837A
- Authority
- CN
- China
- Prior art keywords
- synchro switch
- voltage
- switch
- phase
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
Provided is a two-control-over-three simplified pre-charge synchronous switch circuit of a switched capacitor. Only one of two synchronous switches is provided with a pre-charge circuit, and the other synchronous switch is not provided with a pre-charge circuit, so only one pre-charge circuit is provided instead of two pre-charge circuits. One unit of a switch voltage detection module is arranged on each synchronous switch to detect a zero crossing point and a switching state of the switch. A control module switches on the basis of a time sequence when both the voltage and the voltage change rate of one synchronous switch are in a zero point perfect condition, and switches when the voltage of the other synchronous switch is in a zero crossing quasi perfect condition. No impact current is applied to a switched capacitor, the capacitor is cut off during specific current zero crossing, voltages that the synchronous switches stand are peak-to-peak values of line voltages to the maximum, and a quick switching interval can be of a second level.
Description
Technical field
2 controls 3 that the present invention relates to a kind of opening-closing capacitor bank simplify precharge simultaneous switching circuit, for in electrical network power quality controlling engineering, can realize dropping into the quick non-impact current of Capacitor banks and current over-zero time excise, the voltage that excision current synchronization switch bears is up to the peak-to-peak value of grid line voltage, belongs to reactive power compensation and the harmonic wave technical field of filtering of electric power system.
Background technology
Patent of invention: " a kind of 2 control 3 precharge phased switch circuit of opening-closing capacitor bank ", the patent No.: 200910076776.0, has following benefit: the price overcoming thyristor switchable capacitor group (TSC) is high, and consume energy large shortcoming; Breaking through the slow-footed restriction of conventional phased switch, will shorten operate time, having closed one-off by being opened to, the time, closed not generation current impacted, and opening electric current is zero within 1 second; Reduce the structure that traditional three-phase phased switch adopts three independent switches, an employing two independently switch just completes three-phase on-off action, is called 2 controls 3; To Capacitor banks precharge, at the peak dot fling-cut switch of voltage, switching accuracy is lower than traditional phased switch, and effect is better than traditional phased switch, and this means that cost is low, quality is high, and user accepts well.Energy-conserving and environment-protective, do not have energy consumption, meet requirements of the times.
But, there is the problem that when switch disconnects, switch ends voltage is high in this patent, in this patent, form 3 phase switches to the phased switch of Capacitor banks precharge for two, on every phased switch side, be connected in parallel the series circuit of diode of high-voltage silicon rectifier stack and high-voltage and current-limitation resistance, reach the effect to Capacitor banks precharge.Owing to have employed two pre-charge circuits, after causing K1 switch opens 10ms shown in Fig. 7 of Figure of description, K1 switch ends ceiling voltage is 3.4 times of grid line voltage effective value, higher than the peak-to-peak value of grid line voltage, during the switch opens of K2 shown in Fig. 4, after 10ms, K2 switch ends ceiling voltage is 3 times of grid line voltage effective value, normally, (be not 2*1.414 times line magnitude of voltage owing to there being the voltage on reactor switch), time mechanical switch is opened, switch equally also also exists spring, switch spring makes the pitch smaller of switch contact, when switch opens 10ms, the voltage of switch is peak, run into switch spring again, as easy as rolling off a log danger of restriking.To analyze Producing reason be this patent because the negative electrode of other two diode of high-voltage silicon rectifier stack of phased switch 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, and this structure of mains side of switch causes.3.4 times of voltages of the effective value of grid line voltage are certainly led to when K2 switch opens.If structural change, the negative electrode of a precharge diode is connected on the mains side of switch, and the anode of another precharge diode is connected on the mains side of switch, then have a phase capacitor to have interrupted alternating current during switch opens in Capacitor banks, switch breaks not open, and this structure is unworkable.
2 control 3 circuit are applied a lot in actual production, measure many families 2 and control 3 switched capacitor products, comprise and meet combination switch, synchro switch, when all finding to there is switch opens, phase switch ceiling voltage is 3.4 times of grid line voltage effective value, and contact adhesion phenomenon occurs.
Overcome the shortcoming that 2 of above-mentioned opening-closing capacitor bank controls overtension when 3 precharge phased switch circuit are opened, patent " device based on Synchronous Pre charge switch opening-closing capacitor bank " can be adopted, the patent No.: 201210468939.1, this patent adopts monopolar synchronous K switch 1 and the two poles of the earth synchro switch K2 and Capacitor banks to be connected in series to three-phase power grid voltage, the main contacts two ends of monopolar synchronous K switch 1 and the two poles of the earth synchro switch K2 are connected in parallel pre-charge circuit 1, 2, 3, this patent has the no-flashy-flow when opening-closing capacitor bank back-to-back, current over-zero disconnects, switch motion is level second, the advantage of device green energy conservation.Particularly switch each switch contact when opening bears phase voltage, is not line voltage, and 1.732 times of phase voltage is line voltage, so the voltage of switch contact is low, re-striking fault can not occur.But, this patent have employed 3 synchro switches, in some application scenario, 2 synchro switches of 2 control 3 forms can only be adopted, like this, just propose the voltage that whether can not bear 3.4 times high when 2 control 3 circuit breaker in middle stop, the peak-to-peak value only the bearing grid line voltage i.e. effective value line voltage of 3 times, also to possess the required precision of precharge switched capacitor switching not high, quick non-impact current, energy-conservation advantage simultaneously.The present invention solves this technical problem exactly.
Summary of the invention
2 controls 3 that the present invention proposes a kind of opening-closing capacitor bank simplify precharge simultaneous switching circuit, at two synchro switch K1, in K2, only configure pre-charge circuit 5 at a synchro switch K2, another synchro switch K1 does not configure pre-charge circuit, pre-charge circuit is reduced to one by two, each synchro switch K1, K2 is installed with one group of switching voltage detection module 4, the zero crossing of sense switch and switching state, control module 2 ideally drops into for zero point at the voltage of a synchro switch K2 and voltage change ratio according to sequential simultaneously, ideally drop in the voltage over zero standard of another synchro switch K1, drop into Capacitor banks non-impact current, synchro switch K1 is opened at specific current zero-crossing point, K2 excises capacitor, synchro switch K1, the voltage that K2 bears mostly is the peak-to-peak value of line voltage most, switching frequent intervals can be level second.
The present invention is realized by following scheme: two synchro switch K1 of 2 control 3 opening-closing capacitor bank, in K2, a synchro switch K2 configures pre-charge circuit 5, another synchro switch K1 does not configure pre-charge circuit, each synchro switch is installed with switching voltage detection module 4, the reactor L electric-type container C of Capacitor banks is connected into triangular structure pattern, synchro switch K1, the input of K2 is connected in the two-phase of three phase network power supply, output is connected with two angle points of the Capacitor banks of triangular structure type, 3rd angle point of Capacitor banks is connected with the third phase of three phase network power supply, synchro switch K1, the Control protection module 2 of K2 accepts from synchronizing voltage detection module 1, the information of switching voltage detection module 4 and switching order S1, be zero point according to sequential at the voltage of synchro switch K2 and voltage change ratio simultaneously, it is zero point at the voltage of synchro switch K1, control synchronization K switch 1, K2 coil drive module exports, drive synchro switch K1, K2 coil, break-make synchro switch K1, K2, realize non-impact current opening-closing capacitor bank, wherein said synchro switch K1, K2 is permanent magnet vacuum contactor or permanent-magnet relay, also can be the vacuum contactor of electromagnetic type or the relay of electromagnetic type.
Described at synchro switch K2 two ends, be connected in parallel pre-charge circuit 5, pre-charge circuit 5 is connected in series by diode D1 and current-limiting resistance R1 and forms, and reaches the effect of the precharge of the capacitor C to Capacitor banks, at synchro switch K1 two ends, do not connect pre-charge circuit.Described diode D1 is high voltage silicon stack or general-purpose diode, described current-limiting resistance R1 be the limit withstand voltage >=high-tension resistive of 1000V or the conventional, electric-resistance of the withstand voltage < 1000V of the limit.
Described voltage detection module 4 is divided into two groups, the voltage of first group of detection synchro switch K1, input is connected on the two ends of synchro switch K1, be made up of with the series circuit of current-limiting resistance R3 again the inverse parallel of the light-emitting diode of diode D2 and optocoupler U1, it exports the collector electrode that 1 is the photosensitive amplifier of optocoupler U1, exporting 1 is connected in Control protection module 2, second group of voltage detection module 4 is detected the voltage of synchro switch K2, the input of second group is connected on the two ends of synchro switch K2, be made up of with the series circuit of current-limiting resistance R5 again the inverse parallel of the light-emitting diode of diode D3 and optocoupler U2, it exports the collector electrode that 2 are the photosensitive amplifier of optocoupler U2, export 2 to be connected in Control protection module 2.The function of voltage detection module 4 has two, and one is the zero crossing detecting synchro switch K1, K2, and two is closed, the open modes judging synchro switch K1, K2, and run under height, medium voltage network, optocoupler U1, optocoupler U2 use optical fiber U1, optical fiber U2 instead.
It is described when line voltage is with positive sequence wiring, namely the V phase of line voltage lags behind U phase 120 °, and W phase is ahead of U phase 120 °, and its synchro switch K1 is arranged on U phase, synchro switch K2 is arranged on W phase, under the state that synchro switch K1, K2 open, grid line voltage U
vWby pre-charge circuit 5, a road is to the capacitor C2 precharge of Capacitor banks, and another road, to the capacitor C1 of Capacitor banks and capacitor C3 precharge, is pre-charged to the crest voltage of grid line voltage, grid line voltage U
uWby pre-charge circuit 5 and the first group of input of switching voltage detection module 4 being connected to synchro switch K1, to the capacitor C3 precharge of Capacitor banks, because current-limiting resistance R3 numerical value is large, pre-charge current is little, to the precharge level of capacitor C3 far away less than the crest voltage of grid line voltage, when described Control protection module 2 receives fling-cut switch S1 input command job, on-Line Voltage U
vWnegative peak point, the voltage of synchro switch K2 and voltage change ratio are zero point simultaneously, closed synchro switch K2, the single-phase no current realizing electrical network VW phase impacts and drops into capacitor, voltage and the voltage change ratio of synchro switch while, zero crossing drops into switch is perfect condition, then first group of switching voltage detection module 4 of synchro switch K1 detects the voltage over zero of synchro switch K1, next zero crossing place after the 20ms of zero crossing closes synchro switch K1, realize the impact of three-phase no current to devote oneself to work, drop into switch at the voltage over zero of synchro switch to be as the criterion perfect condition, receive change over switch S1 cease and desist order stop time, at the negative peak point of phase voltage U phase, electric current is open synchro switch K1 zero point, then, on-Line Voltage U
vWnegative peak point, electric current is open synchro switch K2 zero point, and synchro switch K1 bears the peak-to-peak value less than line voltage, and synchro switch K2 bears the peak-to-peak value of line voltage, completes the switching action of a Capacitor banks.Complete switching action next time after allowing for 1 moment in second, there is no rush of current equally.
The reactor L capacitor C of described Capacitor banks can be triangle linked vector graph, also can be Y-connection pattern.
Described synchro switch K1, K2 can be arranged on any two-phase of three-phase circuit, the diode D1 of pre-charge circuit 5 can receive on electric network source by anode, also can receive on electric network source by negative electrode, the switching sequential of synchro switch K1, K2 makes corresponding change, and switching effect is constant.
2 control 3 circuit operate in three-phase circuit, and contactor only has two, has lacked one, and circuit service requirement sequencing control described above is very complicated.The circuit form of switch on-off capacitor is a lot, such as capacitor, reactor series connection triangularity, and switch is placed in A-frame arm, and with three switch on-off capacitors, the operation of switch is single phasing mode, simpler than 2 control 3 types.
2 controls 3 of this opening-closing capacitor bank simplify precharge simultaneous switching circuit, the recharge technique of application Capacitor banks and switching voltage detection technique, ideally drop into for zero point at the voltage of a synchro switch and voltage change ratio according to sequential simultaneously, ideally drop in the voltage over zero standard of another synchro switch, drop into Capacitor banks non-impact current, at specific current zero-crossing point excision capacitor, the voltage that synchro switch bears mostly is the peak-to-peak value of line voltage most, switching frequent intervals can be level second, circuit is simple, cost is low, take up space few, effective, this invention is especially applicable to the 2 control 3 types fill switch altogether in the 400V " Intelligent capacitor " widely applied.
Accompanying drawing explanation
Fig. 1: 2 controls 3 that switching triangle connects Capacitor banks simplify precharge simultaneous switching circuit circuit diagram
Fig. 2: the circuit diagram of voltage detection module 4
Fig. 3: twice switching synchro switch K1 electric current, voltage power supply oscillogram
Fig. 4: twice switching synchro switch K2 electric current, voltage power supply oscillogram
Fig. 5: synchro switch K1 electric current, synchro switch K2 electric current switching movement oscillogram
Fig. 6: 2 controls 3 of switching Y-connection Capacitor banks simplify precharge simultaneous switching circuit circuit diagram
Embodiment
Lead to and see Fig. 1-6.
Ask for an interview two synchro switch K1 that Fig. 1-Fig. 5: 2 controls 3 opening-closing capacitor bank, in K2, a synchro switch K2 configures pre-charge circuit 5, another synchro switch K1 does not configure pre-charge circuit, each synchro switch is installed with switching voltage detection module 4, the reactor L electric-type container C of Capacitor banks is connected into triangular structure pattern, synchro switch K1, the input of K2 is connected in the two-phase of three phase network power supply, output is connected with two angle points of the Capacitor banks of triangular structure type, 3rd angle point of Capacitor banks is connected with the third phase of three phase network power supply, synchro switch K1, the Control protection module 2 of K2 accepts from synchronizing voltage detection module 1, the information of switching voltage detection module 4 and switching order S1, be zero point according to sequential at the voltage of synchro switch K2 and voltage change ratio simultaneously, it is zero point at the voltage of synchro switch K1, control synchronization K switch 1, K2 coil drive module exports, drive synchro switch K1, K2 coil, break-make synchro switch K1, K2, realize non-impact current opening-closing capacitor bank, opening-closing capacitor bank, wherein said synchro switch K1, K2 is permanent magnet vacuum contactor or permanent-magnet relay, also can be the vacuum contactor of electromagnetic type or the relay of electromagnetic type.
Described at synchro switch K2 two ends, be connected in parallel pre-charge circuit 5, pre-charge circuit 5 is connected in series by diode D1 and current-limiting resistance R1 and forms, reach the effect of the precharge of the capacitor C to Capacitor banks, at synchro switch K1 two ends, do not connect pre-charge circuit, described diode D1 is high voltage silicon stack or general-purpose diode, described current-limiting resistance R1 be the limit withstand voltage >=high-tension resistive of 1000V or the conventional, electric-resistance of the withstand voltage < 1000V of the limit.
Please see Figure 2: the circuit diagram of voltage detection module 4, voltage detection module 4 is divided into two groups, the voltage of first group of detection synchro switch K1, input is connected on the two ends of synchro switch K1, be made up of with the series circuit of current-limiting resistance R3 again the inverse parallel of the light-emitting diode of diode D2 and optocoupler U1, it exports the collector electrode that 1 is the photosensitive amplifier of optocoupler U1, exporting 1 is connected in Control protection module 2, second group of voltage detection module 4 is detected the voltage of synchro switch K2, the input of second group is connected on the two ends of synchro switch K2, be made up of with the series circuit of current-limiting resistance R5 again the inverse parallel of the light-emitting diode of diode D3 and optocoupler U2, it exports the collector electrode that 2 are the photosensitive amplifier of optocoupler U2, export 2 to be connected in Control protection module 2.The function of voltage detection module 4 has two, and one is the zero crossing detecting synchro switch K1, K2, and two is closed, the open modes judging synchro switch K1, K2, and run under height, medium voltage network, optocoupler U1, optocoupler U2 use optical fiber U1, optical fiber U2 instead.
It is described when line voltage is with positive sequence wiring, namely the V phase of line voltage lags behind U phase 120 °, and W phase is ahead of U phase 120 °, and its synchro switch K1 is arranged on U phase, synchro switch K2 is arranged on W phase, under the state that synchro switch K1, K2 open, grid line voltage U
vWby pre-charge circuit 5, a road is to the capacitor C2 precharge of Capacitor banks, and another road, to the capacitor C1 of Capacitor banks and capacitor C3 precharge, is pre-charged to the crest voltage of grid line voltage, grid line voltage U
uWby pre-charge circuit 5 and the first group of input of switching voltage detection module 4 being connected to synchro switch K1, to the capacitor C3 precharge of Capacitor banks, because current-limiting resistance R3 numerical value is large, pre-charge current is little, to the precharge level of capacitor C3 far away less than the crest voltage of grid line voltage, when described Control protection module 2 receives fling-cut switch S1 input command job, on-Line Voltage U
vWnegative peak point, the voltage of synchro switch K2 and voltage change ratio are zero point simultaneously, closed synchro switch K2, the single-phase no current realizing electrical network VW phase impacts and drops into capacitor, voltage and the voltage change ratio of synchro switch while, zero crossing drops into switch is perfect condition, then first group of switching voltage detection module 4 of synchro switch K1 detects the voltage over zero of synchro switch K1, next zero crossing place after the 20ms of zero crossing closes synchro switch K1, realize the impact of three-phase no current to devote oneself to work, drop into switch at the voltage over zero of synchro switch to be as the criterion perfect condition, receive change over switch S1 cease and desist order stop time, at the negative peak point of phase voltage U phase, electric current is open synchro switch K1 zero point, then, on-Line Voltage U
vWnegative peak point, electric current is open synchro switch K2 zero point, and synchro switch K1 bears the peak-to-peak value less than line voltage, and synchro switch K2 bears the peak-to-peak value of line voltage, completes the switching action of a Capacitor banks.Complete switching action next time after allowing for 1 moment in second, there is no rush of current equally.Fig. 3 is twice switching synchro switch K1 electric current, voltage power supply oscillogram, Fig. 4 is twice switching synchro switch K2 electric current, voltage power supply oscillogram, from Fig. 3, find out in Fig. 4 that dropping into electric current does not impact, during excision synchro switch, the voltage that synchro switch bears is no more than the peak-to-peak value of grid line voltage, excision synchro switch is not more than 1 second to the time of again dropping into synchro switch, the electric current again dropped into does not impact, Fig. 5 is synchro switch K1 electric current, synchro switch K2 electric current switching movement oscillogram, the action sequence of synchro switch K1 and synchro switch K2 can be seen.
The reactor L capacitor C of described Capacitor banks can be triangle linked vector graph, as Fig. 1, also can be Y-connection pattern, as Fig. 6, as common benefit opening-closing capacitor bank, synchro switch is arranged on outside the Capacitor banks of triangle connection, according to the principles of electric and electronic engineering, Capacitor banks can carry out the equivalent transformation of triangle-star, and operational effect is constant.
Described synchro switch K1, K2 can be arranged on any two-phase of three-phase circuit, the diode D1 of pre-charge circuit 5 can receive on electric network source by anode, also can receive on electric network source by negative electrode, the switching sequential of synchro switch K1, K2 makes corresponding change, and switching effect is constant.
The main element type selecting of a specific embodiment: 2 controls 3 being applied to the opening-closing capacitor bank of line voltage 400V electric current 40A simplify precharge simultaneous switching circuit, synchro switch K1, synchro switch K2 adopt permanent-magnet relay device, model DS903C-C-90A 9V, diode D1 voltage is 3000V, electric current 1A, the current-limiting resistance of connecting with diode D1 is 400 ohm, 8W resistance, optocoupler U1 in voltage detection module 4, optocoupler U2 are 4N36, current-limiting resistance R3, current-limiting resistance R5 are 400K ohm, 2W resistance.Resistance R2, resistance R4 are 10K ohm, 1/4W resistance.
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 (6)
1. 2 controls 3 of an opening-closing capacitor bank simplify precharge simultaneous switching circuit, it is characterized in that: two synchro switch K1 of 2 control 3 opening-closing capacitor bank, in K2, a synchro switch K2 configures pre-charge circuit 5, another synchro switch K1 does not configure pre-charge circuit, each synchro switch is installed with switching voltage detection module 4, the reactor L electric-type container C of Capacitor banks is connected into triangular structure pattern, synchro switch K1, the input of K2 is connected in the two-phase of three phase network power supply, output is connected with two angle points of the Capacitor banks of triangular structure type, 3rd angle point of Capacitor banks is connected with the third phase of three phase network power supply, synchro switch K1, the Control protection module 2 of K2 accepts from synchronizing voltage detection module 1, the information of switching voltage detection module 4 and switching order S1, be zero point according to sequential at the voltage of synchro switch K2 and voltage change ratio simultaneously, it is zero point at the voltage of synchro switch K1, control synchronization K switch 1, K2 coil drive module exports, drive synchro switch K1, K2 coil, break-make synchro switch K1, K2, realize non-impact current opening-closing capacitor bank, opening-closing capacitor bank, wherein said synchro switch K1, K2 is permanent magnet vacuum contactor or permanent-magnet relay, also can be the vacuum contactor of electromagnetic type or the relay of electromagnetic type.
2. 2 controls 3 of a kind of opening-closing capacitor bank according to claim 1 simplify precharge simultaneous switching circuit, it is characterized in that: at synchro switch K2 two ends, be connected in parallel pre-charge circuit 5, pre-charge circuit 5 is connected in series by diode D1 and current-limiting resistance R1 and forms, reach the effect of the precharge of the capacitor C to Capacitor banks, at synchro switch K1 two ends, do not connect pre-charge circuit.
3. 2 controls 3 of a kind of opening-closing capacitor bank according to claim 1 simplify precharge simultaneous switching circuit, it is characterized in that: voltage detection module 4 is divided into two groups, the voltage of first group of detection synchro switch K1, input is connected on the two ends of synchro switch K1, be made up of with the series circuit of current-limiting resistance R3 again the inverse parallel of the light-emitting diode of diode D2 and optocoupler U1, it exports the collector electrode that 1 is the photosensitive amplifier of optocoupler U1, exporting 1 is connected in Control protection module 2, second group of voltage detection module 4 is detected the voltage of synchro switch K2, the input of second group is connected on the two ends of synchro switch K2, be made up of with the series circuit of current-limiting resistance R5 again the inverse parallel of the light-emitting diode of diode D3 and optocoupler U2, it exports the collector electrode that 2 are the photosensitive amplifier of optocoupler U2, export 2 to be connected in Control protection module 2.The function of voltage detection module 4 has two, and one is the zero crossing detecting synchro switch K1, K2, and two is closed, the open modes judging synchro switch K1, K2, and run under height, medium voltage network, optocoupler U1, optocoupler U2 use optical fiber U1, optical fiber U2 instead.
4. 2 controls 3 of a kind of opening-closing capacitor bank according to claim 1 simplify precharge simultaneous switching circuit, it is characterized in that: when line voltage is with positive sequence wiring, namely the V phase of line voltage lags behind U phase 120 °, W phase is ahead of U phase 120 °, its synchro switch K1 is arranged on U phase, synchro switch K2 is arranged on W phase, under the state that synchro switch K1, K2 open, grid line voltage U
vWby pre-charge circuit 5, a road is to the capacitor C2 precharge of Capacitor banks, and another road, to the capacitor C1 of Capacitor banks and capacitor C3 precharge, is pre-charged to the crest voltage of grid line voltage, grid line voltage U
uWby pre-charge circuit 5 and the first group of input of switching voltage detection module 4 being connected to synchro switch K1, to the capacitor C3 precharge of Capacitor banks, because current-limiting resistance R3 numerical value is large, pre-charge current is little, to the precharge level of capacitor C3 far away less than the crest voltage of grid line voltage, when described Control protection module 2 receives fling-cut switch S1 input command job, on-Line Voltage U
vWnegative peak point, the voltage of synchro switch K2 and voltage change ratio are zero point simultaneously, closed synchro switch K2, the single-phase no current realizing electrical network VW phase impacts and drops into capacitor, voltage and the voltage change ratio of synchro switch while, zero crossing drops into switch is perfect condition, then first group of switching voltage detection module 4 of synchro switch K1 detects the voltage over zero of synchro switch K1, next zero crossing place after the 20ms of zero crossing closes synchro switch K1, realize the impact of three-phase no current to devote oneself to work, drop into switch at the voltage over zero of synchro switch to be as the criterion perfect condition, receive change over switch S1 cease and desist order stop time, at the negative peak point of phase voltage U phase, electric current is open synchro switch K1 zero point, then, on-Line Voltage U
vWnegative peak point, electric current is open synchro switch K2 zero point, and synchro switch K1 bears the peak-to-peak value less than line voltage, and synchro switch K2 bears the peak-to-peak value of line voltage, completes the switching action of a Capacitor banks.Complete switching action next time after allowing for 1 moment in second, there is no rush of current equally.
5. 2 controls 3 of a kind of opening-closing capacitor bank according to claim 1 simplify precharge simultaneous switching circuit, it is characterized in that: the reactor L capacitor C of described Capacitor banks can be triangle linked vector graph, also can be Y-connection pattern.
6. 2 controls 3 of a kind of opening-closing capacitor bank according to claim 1 simplify precharge simultaneous switching circuit, it is characterized in that: synchro switch K1, K2 can be arranged on any two-phase of three-phase circuit, the diode D1 of pre-charge circuit 5 can receive on electric network source by anode, also can receive on electric network source by negative electrode, the switching sequential of synchro switch K1, K2 makes corresponding change, and switching effect is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510351320.6A CN104979837A (en) | 2015-06-23 | 2015-06-23 | Two-control-over-three simplified pre-charge synchronous switch circuit of switched capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510351320.6A CN104979837A (en) | 2015-06-23 | 2015-06-23 | Two-control-over-three simplified pre-charge synchronous switch circuit of switched capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104979837A true CN104979837A (en) | 2015-10-14 |
Family
ID=54276075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510351320.6A Pending CN104979837A (en) | 2015-06-23 | 2015-06-23 | Two-control-over-three simplified pre-charge synchronous switch circuit of switched capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104979837A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105826927A (en) * | 2016-03-22 | 2016-08-03 | 广州开能电气实业有限公司 | Angle joint capacitor set switching module |
| CN106057566A (en) * | 2016-06-24 | 2016-10-26 | 国家电网公司 | Novel compound switch for high-voltage capacitor switching and working method of novel compound switch |
| CN106374507A (en) * | 2016-09-06 | 2017-02-01 | 青岛鼎信通讯股份有限公司 | Three-phase common compensation intelligent synchronous switch and control protection method thereof |
| 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 |
| EP4293888A1 (en) * | 2022-06-15 | 2023-12-20 | Guangdong Carrier HVAC Co., Ltd. | Ac-side precharge isolation detection circuit and ac-side precharge circuit |
-
2015
- 2015-06-23 CN CN201510351320.6A patent/CN104979837A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105826927A (en) * | 2016-03-22 | 2016-08-03 | 广州开能电气实业有限公司 | Angle joint capacitor set switching module |
| 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 |
| 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 |
| CN106057566A (en) * | 2016-06-24 | 2016-10-26 | 国家电网公司 | Novel compound switch for high-voltage capacitor switching and working method of novel compound switch |
| CN106057566B (en) * | 2016-06-24 | 2019-07-23 | 国家电网公司 | A kind of combination switch and its working method for high-voltage capacitance switching |
| CN106374507A (en) * | 2016-09-06 | 2017-02-01 | 青岛鼎信通讯股份有限公司 | Three-phase common compensation intelligent synchronous switch and control protection method thereof |
| EP4293888A1 (en) * | 2022-06-15 | 2023-12-20 | Guangdong Carrier HVAC Co., Ltd. | Ac-side precharge isolation detection circuit and ac-side precharge circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104979837A (en) | Two-control-over-three simplified pre-charge synchronous switch circuit of switched capacitor | |
| CN201845250U (en) | Intelligent digital control non-contact voltage stabilizer | |
| CN103165342B (en) | Intelligent controller for split phase type quick permanent magnet vacuum circuit breaker | |
| CN106057566B (en) | A kind of combination switch and its working method for high-voltage capacitance switching | |
| CN109586557A (en) | A kind of frequency converter pre-charge system and frequency converter | |
| CN106300398B (en) | Interphase load transfer terminal device based on steady-state waveform fitting | |
| CN102611123A (en) | Intelligent reactive compensation device based on single three-pole synchronous switch | |
| CN102005994A (en) | Same-phase switching circuit and actuating device of rare-earth permanent magnet synchronous electric motor | |
| CN102810864A (en) | Comprehensive treatment device of electric energy quality of low-voltage distribution network | |
| CN2800620Y (en) | Intelligent zero-cross opening or closing gate breaker | |
| CN112666494A (en) | Circuit for detecting three-phase mains power failure | |
| CN104578093A (en) | Phase-controlled switch peak zero-cross-switching inrush current control circuit and control method | |
| CN102420431A (en) | Low-voltage phase control switch for mechanically switching capacitor | |
| CN102931669A (en) | Device for switching capacitor bank based on synchronous precharging switch | |
| CN106374507A (en) | Three-phase common compensation intelligent synchronous switch and control protection method thereof | |
| CN203085446U (en) | Phase selection switch controller | |
| CN204304445U (en) | A kind of phased switch peak value operating passing zero Inrush control circuit | |
| CN106451500B (en) | Interphase load transfer terminal device based on transient waveform fitting | |
| CN205407276U (en) | Electric capacity zero passage switching module | |
| CN204809871U (en) | Precharge synchro switch circuit is simplified in 2 accuses 3 of switched capacitor group | |
| CN106229963B (en) | A kind of silicon-controlled control circuit mostly changed to crush-cutting | |
| CN202474877U (en) | Single triple-pole synchronous switch-based intelligent reactive power compensation device | |
| CN102593847B (en) | Single tripolar synchronous switch-based intelligent reactive power compensation device | |
| CN202353224U (en) | Low-voltage phased switching capacitor switch | |
| CN101783511B (en) | Two-control three-precharge phase-control switch circuit of switched capacitor bank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151014 |
|
| WD01 | Invention patent application deemed withdrawn after publication |