CN1215626C - Voltage fluctuation compensation device - Google Patents

Abstract

A voltage variation compensator with reduced cost and size, which is fitted with a detection control unit for monitoring voltage lowering in a power system, and for controlling power supply on the basis of that, and suppresses variations in the voltage supplied to a load, and to realize high- precision voltage compensation. Device losses are reduced by connecting, the power system, a plurality of voltage compensating circuits P1-P3 in series with, N1-N3 which convert DC voltages stored in capacitors 11 having been charged voltages respectively different (2K times a minimum voltage (K=0, 1, 2, and so on)) into ACs and output them, selecting a desired combination from the compensating circuits P1-P3, N1-N3, performing voltage compensation by the sum of their output voltages, when the system voltage is lowered, and performing bypassing with a high-speed mechanical short-circuiting switch 8, when the system voltage is normal.

Description

Voltage fluctuation compensation device and be provided with the electric power system of this voltage fluctuation compensation device

Technical field

When the present invention is the power system voltage instantaneity decline of relevant a kind of supply load, with its electric power system of measuring the voltage fluctuation compensation device of also bucking voltage decline and being provided with this voltage fluctuation compensation device.

Technical background

Descend because of thunder and lightning etc. makes the voltage instantaneity of electric power system, precision equipment of factory etc. and so on misoperation or temporarily stop sometimes can causing infringement very big on the production line.In order to prevent such infringement, the voltage fluctuation of degradation under the instantaneous voltage of supervision electric power system, and the voltage fluctuation compensation device of using compensation voltage decline.

Figure 22 illustrates the signal pie graph of existing voltage fluctuation compensation device.As shown in the figure, from the electric power of power transmission line 1,, be connected to user's (load) 3 and supply capability by voltage fluctuation compensation device with transformer 2 step-downs.Voltage fluctuation compensation device is made of DC power supply 4, converter 5, smoothing filter 6 and high-power transformer 7.

Relevant this existing voltage fluctuation compensation device below is shown, the voltage compensation action of (below, be called wink when low) when the instantaneous decline of system voltage.

System voltage, the output of voltage fluctuation compensating circuit when Figure 23 represents respectively that system voltage wink is low and supply with user 3 voltage.As shown in the figure, in case instantaneity voltage takes place on the system voltage to descend, just measuring voltage at the test section (scheming not shown) of monitor voltage fluctuation descends, by the control of powering based on this, in the voltage fluctuation compensation device, alternating voltage takes place by DC power supply 4 and converter 5 in employing, the way that process smoothing filter 6 and high-power transformer 7 are connected in series with electric power system, and the voltage of compensates electric system descends.Therefore, the output voltage that voltage fluctuation compensation device is come is added on the system voltage after voltage descends, shows normal voltage greatly to user's 3 supply capabilities.

Existing voltage fluctuation compensation device constitutes as described above, because even system voltage just often, also make the load current of considerable part flow through converter 5, therefore by transformer 7, the loss of transformer 7 and converter 5 under normal circumstances also takes place, and needs large-scale cooling device.

And the wink of system voltage is when hanging down, owing to passing through smoothing filter 6 and transformer 7 to the electric power system service voltage, so the capacity of smoothing filter 6 or transformer 7 will increase the problem that exists device to maximize.

Summary of the invention

The present invention researches and develops in order to solve above-mentioned this problem, carry out high-accuracy voltage when its purpose is to obtain a kind of can hanging down in system voltage wink and compensate, voltage fluctuation compensation device that the miniaturization of the whole cheap also energy of device constitutes and the electric power system that is provided with this voltage fluctuation compensation device.

The described voltage fluctuation compensation device in the 1st aspect of the present invention is: comprise and carry out the power on supervision of drops and based on this detection control part of controlling of electric power system, and the voltage fluctuation of load is supplied with in inhibition, it is characterized in that also comprising: possess the energy storing device of storing different voltages respectively, the direct voltage of this energy storing device storage converted to exchange output, be connected in series to a plurality of voltage compensating circuits in the electric power system, when the voltage of above-mentioned electric power system descends, select the combination that requires among above-mentioned a plurality of voltage compensating circuits, the voltage that compensates above-mentioned electric power system with its output voltage summation descends.

And the described voltage fluctuation compensation device in the 2nd aspect of the present invention is, the absolute value that is stored in the different voltages on the energy storing device in a plurality of voltage compensating circuits respectively is to this voltage compensating circuit output voltage absolute value of minimum roughly 2 ^KTimes, K=0,1,2 ....

And the described voltage fluctuation compensation device in the 3rd aspect of the present invention is, on each output of or a plurality of above-mentioned voltage compensating circuits of being connected in series, possesses the high speed machine formula short switch that is used for the bypass voltage compensating circuit, the voltage of above-mentioned electric power system just often, connect this whole short switches and make whole above-mentioned voltage compensating circuit bypasses, disconnect this whole short switches when the voltage of above-mentioned electric power system descends, the voltage that is compensated above-mentioned electric power system by the next voltage output of above-mentioned voltage compensating circuit descends.

And the described voltage fluctuation compensation device in the 4th aspect of the present invention is, output at the full compensating circuit that constitutes by the whole voltage compensating circuits that are connected in series, possesses the high speed machine formula short switch that is used for the bypass voltage compensating circuit with this full compensating circuit parallel connection, the voltage of electric power system is just often connected this short switch and is made above-mentioned voltage compensating circuit bypass, the voltage of above-mentioned electric power system disconnects this short switch when descending, export the voltage decline that compensates above-mentioned electric power system by the voltage that above-mentioned full compensating circuit comes.

And the described voltage fluctuation compensation device in the 5th aspect of the present invention is, because of the voltage of electric power system descends the disconnection that causes short switch when beginning, in the closed-loop path that constitutes by full compensating circuit and above-mentioned short switch, along with the predetermined energy storage device in above-mentioned full compensating circuit flows out discharging current, form mandatory current zero for the commercial frequency alternating current that flows through above-mentioned short switch, this alternating current of instantaneous blocking.

And the described voltage fluctuation compensation device in the 6th aspect of the present invention is, carry out supervision that voltage in the electric power system descends and possess: when the voltage of above-mentioned electric power system descends, detect the checkout gear of the current polarity that flows through above-mentioned short switch based on this detection control part of powering control; And the voltage compensating circuit of control selection requirement, the energy storing device in this voltage compensating circuit flows through the control device of catching up with the discharging current of stating the mobile opposite current polarity of short switch.

And the described voltage fluctuation compensation device in the 7th aspect of the present invention is, short switch possesses the high speed reversing arrangement, so that descend the disconnection that causes this short switch when beginning at the voltage of electric power system, because supply with and the electric current that flows through the opposite current direction of short switch, the electric current of this short switch is flow through in instantaneous blocking.

And the described voltage fluctuation compensation device in the 8th aspect of the present invention is that according to the 4th aspect, short switch is that electromagnetic repulsion power is used for the mechanical switch that the contact opening operation disconnects.

And the described voltage fluctuation compensation device in the 9th aspect of the present invention is, according to the 1st aspect, each voltage compensating circuit possesses the compensating switch and the change over switch that is parallel-connected to this voltage compensating circuit output that is used for stored voltage on the energy storing device is inserted electric power system, above-mentioned compensating switch and above-mentioned change over switch, the thyristor by reverse parallel connection connection diode constitutes respectively.

And the described voltage fluctuation compensation device in the 10th aspect of the present invention is, according to the 1st aspect, each voltage compensating circuit possesses 4 full-bridge converter that thyristor constitutes that connected diode by reverse parallel connection respectively, polarity when descending according to power system voltage, by positive and negative the two one of polarity, output energy storing device on stored voltage.

And the described voltage fluctuation compensation device in the 11st aspect of the present invention is, according to the 1st aspect, each voltage compensating circuit possesses 2 thyristors that reverse parallel connection respectively connects diode to carry out opposite direction and is connected in series, and the change over switch of this voltage compensating circuit output that is connected in parallel, with 2 half bridge converters that thyristor constitutes that are connected diode by reverse parallel connection respectively, polarity when descending, output according to the voltage of electric power system be stored in the output generating positive and negative voltage a pair of energy storing device the two one of voltage.

And the described voltage fluctuation compensation device in the 12nd aspect of the present invention is that according to the 1st aspect, energy storing device is with charging transformer and the capacitor of charging with diode charging.

And the described voltage fluctuation compensation device in the 13rd aspect of the present invention is according to the 12nd aspect, to be hindered with inserting the electric current brownout in the closed-loop path with the charging that transformer secondary output coil, charging constitute with diode and capacitor by charging.

And the described voltage fluctuation compensation device in the 14th aspect of the present invention is, according to the 9th aspect, energy storing device is to use the capacitor of diode charging with transformer with charging with above-mentioned charging, and passes through the above-mentioned capacitor charging of the 2 common secondary coils of above-mentioned charging transformer to a plurality of voltage compensating circuits.

And the described voltage fluctuation compensation device in the 10th aspect of the present invention is, according to the 14th aspect, the capacitor that possesses whole voltage compensating circuits is connected in parallel with the resistance of the charging voltage correspondence that requires respectively, and the charging transformer secondary output coil that these whole capacitors are charged in the lump, at the positive pole of this charging with the transformer secondary output coil, between the intermediate point of two terminals of negative side and this side of the positive electrode terminal, all the be connected in series capacitor of positive polarity of output voltage, between above-mentioned intermediate point and above-mentioned negative side terminal, all the be connected in series capacitor of negative polarity of output voltage, on the tie point of the capacitor of the capacitor of above-mentioned positive polarity and above-mentioned negative polarity, connect the output that above-mentioned charging uses the intermediate point of transformer secondary output coil, according to the charging voltage of the ratio dividing potential drop of the above-mentioned resistance that is connected in parallel, to above-mentioned each capacitor charging.

And the described voltage fluctuation compensation device in the 16th aspect of the present invention is, according to the 15th aspect, between the tie point of charging with the capacitor of the capacitor of the intermediate point of transformer secondary output coil and positive polarity and negative polarity, compare with the resistance that is connected in parallel on each capacitor, insert fully little electric current brownout resistance.

And the described voltage fluctuation compensation device in the 17th aspect of the present invention is that according to the 12nd aspect, the charging transformer that capacitor is charged is that primary side is connected in the electric power system.

And the described voltage fluctuation compensation device in the 18th aspect of the present invention is, according to the 1st aspect, in order to carry out supervision that voltage in the electric power system descends and based on detection control part action of this control of powering, with the step-down that connects primary side in the electric power system with transformer be connected primary side that this step-down uses and the change-over circuit of forming by rectification circuit and capacitor and constitute continuous-current plant, the direct voltage from above-mentioned change-over circuit will be supplied with above-mentioned detection control part.

And the described voltage fluctuation compensation device in the 19th aspect of the present invention is, according to the 18th aspect, in the operate time that the voltage of compensates electric system descends, increase condenser capacity, setting is bigger than setting to the discharge time constant of change-over circuit efferent from this capacitor, makes the output voltage decline that comes from continuous-current plant become below the permissible value of regulation.

And the described voltage fluctuation compensation device in the 20th aspect of the present invention is, according to the 1st aspect, in order to carry out supervision that voltage in the electric power system descends and based on detection control part action of this control of powering, the DC power supply that the system beyond above-mentioned electric power system constitutes is supplied with direct voltage to above-mentioned detection control part.

And the described voltage fluctuation compensation device in the 21st aspect of the present invention is according to the 1st aspect, to possess the bypass switch in parallel with these whole compensating circuits at the whole compensating circuit outputs that are made of the whole voltage compensating circuits that are connected in series.

And the described voltage fluctuation compensation device in the 22nd aspect of the present invention is, according to the 4th aspect～the 21st aspect, in the both sides of whole compensating circuits, from using the tie point of switch to insert change over switches to these whole compensating circuit sides with short switch or bypass.

And the described voltage fluctuation compensation device in the 23rd aspect of the present invention is, according to the 4th aspect, change over switch is connected in series at the circuit two ends of be connected in parallel whole compensating circuits and short switch, and with the outside of this change over switch of both sides as tie point, have and above-mentioned whole compensating circuits and above-mentioned short switch bypass switch in parallel.

And the described voltage fluctuation compensation device in the 24th aspect of the present invention is according to the 1st aspect, comprising: be used for the voltage fluctuation compensation device as claimed in claim 1 that is connected with described electric power system; Under-voltage relay is located at the upstream side of this electric power system with respect to described voltage fluctuation compensation device; The protecting electrical power system circuit breaker is used to detect the certain above voltage of above-mentioned electric power system and descends, and just interdicts circuit; Stop circuit, in the action that the above-mentioned power system voltage of the output voltage compensation that comes with voltage compensating circuit descends, make the voltage drop detection signal that becomes the circuit open command of above-mentioned under-voltage relay output not be sent to above-mentioned protecting electrical power system circuit breaker.

Description of drawings

Fig. 1 is the voltage fluctuation compensation device pie graph of the embodiment of the invention 1.

Fig. 2 represents the voltage wink of the embodiment of the invention 1 to hang down the detailed circuit diagram of control circuit.

Fig. 3 is the voltage fluctuation compensation device movement oscillogram of the explanation embodiment of the invention 1.

Fig. 4 is another routine voltage fluctuation compensation device pie graph of the embodiment of the invention 1.

Fig. 5 is another routine voltage compensating circuit pie graph of the embodiment of the invention 1.

Fig. 6 is the voltage compensating circuit pie graph of the embodiment of the invention 2.

Fig. 7 is the voltage fluctuation compensation device pie graph of the embodiment of the invention 3.

Fig. 8 is the voltage fluctuation compensation device pie graph of the embodiment of the invention 4.

Fig. 9 is the voltage fluctuation compensation device pie graph of the embodiment of the invention 5.

Figure 10 is the commutation action diagram of the steady short-circuit switch of the explanation embodiment of the invention 5.

Figure 11 represents the current-voltage waveform figure of voltage fluctuation compensation device when voltage compensation moves of the embodiment of the invention 5.

Figure 12 represents the short switch structural section of the embodiment of the invention 5.

Figure 13 is the voltage fluctuation compensation device signal pie graph of the embodiment of the invention 6.

Figure 14 is the disconnect structural map of the embodiment of the invention 6.

Figure 15 is the voltage fluctuation compensation device signal pie graph of the embodiment of the invention 7.

Figure 16 is another routine voltage fluctuation compensation device signal pie graph of the embodiment of the invention 7.

Figure 17 is the whole compensating circuit pie graphs of another example of the embodiment of the invention 7.

Figure 18 is the voltage fluctuation compensation device pie graph of the embodiment of the invention 8.

Figure 19 represents the continuous-current plant output map of the embodiment of the invention 8.

Figure 20 is another routine voltage fluctuation compensation device pie graph of the embodiment of the invention 8.

Figure 21 is the voltage fluctuation compensation device signal pie graph of the embodiment of the invention 9.

Figure 22 is existing voltage fluctuation compensation device signal pie graph.

Figure 23 is the voltage compensation action diagram of the existing voltage fluctuation compensation device of explanation.

Embodiment

Embodiment 1

Below, describe relevant embodiments of the invention 1 in detail.

Fig. 1 is the voltage fluctuation compensation device pie graph of the embodiment of the invention 1.

From the electric power of power transmission line 1, with transformer 2 step-downs, be connected to user 3 (load), supply electric power through voltage fluctuation compensation device 100.

About voltage fluctuation compensation device 100, as shown in the figure, in the electric power system, a plurality of compensating units 110 that constitute by 2 voltage compensating circuit P, N selecting according to polarity of voltage that are connected in series with.By whole compensating circuits 120 that these a plurality of (at this moment 6 s') that are connected in series voltage compensating circuit N1, P1, N2, P2, N3, P3 constitute, possess the steady short-circuit switch 8 of high speed machine formula, its output is with compensating circuit 120 is in parallel entirely.

In each voltage compensating circuit P1～P3, N1～N3, possess: wink that the output parallel connection possesses low change over switch 9, wink low compensating switch 10, as the charging capacitor 11 of energy storing device be used for to the charging of charging capacitor 11 chargings with diode 12 and charging secondary coil 14 with transformer 200, the charging voltage of charging capacitor 11 by the wink that is connected in series in this charging capacitor 11 low compensating switch 10 receive in the electric power system.And, wink low change over switch 9 with wink low compensating switch 10 is connected the thyristor of diode, for example IGB T formation by reverse parallel connection.In addition, the self-extinction of arc type element beyond the thyristor IGB T is also harmless.

The charging of charging capacitor 11 usefulness is filled voltage with diode 12 and charging with the secondary coil 14 of transformer 200, and charging connects with electric power system with transformer 13.In addition, the 15th, the charging iron core of transformer 200.

2 voltage compensating circuit P, N in compensating unit 110 wield positive and negative voltage respectively and take place.That is, by means of the effect of 2 chargings with diode 12p, 12n, utilize common secondary coil 14, the identical size of the voltage of opposite polarity is given charging capacitor 11p and charging capacitor 11n charging separately.

The voltage ratio of charging capacitor 11 (11p1,11n1) (11p2,11n2) (11p3, the 11n3) charging of setting in compensating unit 110 is 2 power ratio.That is, satisfy following relation.

Vn3=2 * Vn2=2 * 2 * Vn1 (p too)

The low change over switch 9 of steady short-circuit switch 8, wink, wink, low compensating switch 10 was connected to as on the voltage wink of the detecting control part low control circuit 16.And system voltage also is input to low control circuit 16 of voltage wink.Below explanation is about the formation and the action of low control circuit 16 of this voltage wink.

Fig. 2 is the detailed circuit diagram of low control circuit 16 of expression voltage wink.And Fig. 3 is voltage compensation action that produces and the oscillogram that concerns of hanging down control circuit 16 control actions voltage wink of the voltage fluctuation compensation device 100 shown in the presentation graphs 1.

As shown in Figure 2, system voltage be input to voltage wink low control circuit 16 and with target voltage 25 relatively.At this moment target voltage 25 is made as system voltage just often.Amplify both poor with error amplifying circuit 26, and then implement after the absolute value conversion, convert 3 position digital signals (D1～D3) at A/D converter 27.When the system voltage and the difference of target voltage 25 become charging voltage Vp1 with charging capacitor 11p1 and equate, only make that lowest order becomes 1 in the output signal of A/D converter 27, promptly become the mode of " 001 ", adjust the gain of error amplifying circuit 26 in advance.

As long as any of D1～D3 signal becomes 1,, disconnect steady short-circuit switch 8 with signal Z (=0) just by NOR circuit 28.

On the other hand, the system voltage that input voltage wink is hanged down control circuit 16 also is input to polarity determination circuit 29, and decision polarity.Secondly, the polarity of system voltage, is selected to become activation signal Yp or Yn, Xp or Xn by digital signal D1～D3 via AND circuit 30 and inverter 31 according to positive and negative situation.Xp, Xn are the drive signals of low compensating switch 10 of wink, and Yp, Yn are the drive signals of low change over switch 9 of wink, wink low change over switch 9 and wink low compensating switch 10 constitute by inverter 31, it is moved with opposite polarity.

System voltage just often, it is complete 0 o'clock of digital signal D1～D3, steady short-circuit switch 8 is in the low change over switch 9 of connection (signal Z is 1), wink and is in connections (signal Y is 1), wink hangs down compensating switch 10 and be in disconnection (signal X is 0), and electric current flows through steady short-circuit switch 8.At this moment, charging capacitor 11 charges to certain voltage by means of charging with transformer 200.Because the work that charging is just charged to charging capacitor 11 with transformer 200 is so small capacity transformer is just done.

Compensating movement when secondly, illustrating that according to Fig. 3 wink is low.

At moment t0,, instantaneous voltage descends if taking place on the system voltage.After the moment t0, the output generation error voltage of error amplifying circuit 26.Thus, in the output of A/D converter 27, corresponding to this error voltage digital signal D1～D3 takes place also.Meanwhile, signal Z becomes 0, and steady short-circuit switch 8 is disconnected.

T0～t1 constantly, because the polarity of system voltage is being for just, digital signal D1～D3 is sent to p side element respectively.The signal D1 of lowest order is 1 o'clock, and among the voltage compensating circuit P1, Xp1 becomes 1, Yp1 becomes 0, and wink, low compensating switch 10p1 connected, and wink, low change over switch 9p1 disconnected, and the voltage Vp1 of charging capacitor 11p1 is by low compensating switch 10p1 output of wink.When signal D2 was 1, among the voltage compensating circuit P2, X p2 became 1, Yp2 becomes 0, and wink, low compensating switch 10p2 connected, and wink, low change over switch 9p2 disconnected, and the voltage Vp2 of charging capacitor 11p2 is by low compensating switch 10p2 output of wink.Equally, the signal D3 of highest order is 1 o'clock, the voltage Vp3 of output charging capacitor 11p3 among the voltage compensating circuit P3.In addition, about becoming 0 signal among each digital signal D1～D3, for example the signal D1 of lowest order is 0 o'clock, among the voltage compensating circuit P1 Xp1 be 0 and Yp1 be 1, thereby, be approximately 0 from the output of voltage compensating circuit P1 along with low its output of change over switch 9p1 short circuit of wink.These outputs are made up by system, can produce " 000 "～8 grade output voltages of " 111 ", and maximum bucking voltage becomes 7 * Vp1.

Up to t1～t2, the polarity of system voltage is for after negative, and digital signal D1～D3 is sent to n side element respectively, in voltage compensating circuit N1～N3, exports bucking voltage equally, and maximum bucking voltage becomes 7 * Vn1.

In the foregoing description 1, the full compensating circuit 120 that is made of a plurality of voltage compensating circuit N1, P1, N2, P2, N3, the P3 that are connected in series is connected in series because of direct and electric power system, so do not need existing the sort of high-power transformer.And,, possess the steady short-circuit switch 8 of high speed machine formula with full compensating circuit 120 parallel connections, system voltage just often, 8 conductings of steady short-circuit switch also make current bypass, therefore device loss just often is almost 0, the cooling device low capacity just, whole device can cheap miniaturization.

And, when the instantaneous decline of system voltage, control by numerical grade, select combination to have a plurality of voltage compensating circuit N1, P1, N2, P2, N3, the P3 of the charging capacitor 11 of different charging voltages separately, summation mode with output voltage is carried out voltage compensation, thereby may carry out extremely meticulous voltage compensation, so that can or use small-sized output filter.And, generally using occasion such as PWM control, and partly produce suitable operating lag at the output filter frequency band and compare, control mode is owing to be that the numerical grade formula is controlled, so but real-Time Compensation voltage, and then fine compensation voltage more.

And setting is Vn3=2 * Vn2=2 * 2 * Vn1 (p too) to the voltage of charging capacitor 11 chargings of each voltage compensating circuit P1～P3, N1～N3, and therefore uniformly-spaced high accuracy is pressed grade control compensation voltage.

And the charging of charging capacitor 11 by being connected in electric power system is with transformer 200, and system voltage just often can fully charge, thereby charging is just enough with transformer 200 usefulness low capacities, and charging circuit is with small-sized and cheaply get up.And,, install also simple in order to charge automatically.

In addition, in the foregoing description 1, at the output of whole compensating circuits 120, though have a steady short-circuit switch 8 with whole compensating circuit 120 parallel connections, but as shown in Figure 4, also can be in the outfit in parallel of each output of each voltage compensating circuit P1～P3, N1～N3.And, on compensating unit 110 each output that constitute by a pair of voltage compensating circuit P, N, having steady short-circuit switch 8, Fig. 5 illustrates the pie graph of each compensating unit 110 at this moment.Perhaps at other a plurality of voltage compensating circuit P1～P3, each output of N1～N3, it is good to have steady short-circuit switch 8.Like this, even have a plurality of steady short-circuit switches 8, control mode is also same with one situation, just often closed all steady short-circuit switches 8, make whole voltage compensating circuit P1～P3, N1～N3 bypass, when the voltage of electric power system descends, disconnect whole steady short-circuit switches 8, according to the voltage decline of the next voltage output compensates electric system of voltage compensating circuit P1～P3, N1～N3.

Embodiment 2

Fig. 6 (a) and Fig. 6 (b) are the voltage compensating circuit pie graphs of the embodiment of the invention 2 voltage fluctuation compensation devices.

In the foregoing description 1, though constitute compensating unit 110 with a pair of voltage compensating circuit P, N, in 2 examples shown in the present embodiment 2, each compensating unit 110 of output generating positive and negative voltage is made of a voltage compensating circuit PN.Below, illustrate about corresponding to voltage compensating circuit P1 of the foregoing description and the voltage compensating circuit PN1 of voltage compensating circuit N1.

In the 1st example that Fig. 6 (a) illustrates, voltage compensating circuit PN1 possess by reverse parallel connection connect full-bridge converter that 4 thyristor 17a～17d of diode constitute, as the charging capacitor 18 of energy storing device and the charging that is used for charging capacitor 18 chargings with diode 12 and charging secondary coil 14 with transformer 200, the charging voltage Vpn1 of charging capacitor 18 is connected in the electric power system according to the polarity of the on plus or minus of thyristor 17a～17d.And,, steady short-circuit switch 8 in parallel with voltage compensating circuit PN1 is set at the output of voltage compensating circuit PN1.

At this moment, also same with the foregoing description 1, voltage compensating circuit PN1 and voltage compensating circuit PN2, the PN3 (scheming not shown) that has the charging capacitor 18 that charging voltage is different separately is connected in series in the electric power system.And, set voltage ratio that the charging capacitor 18 in each voltage compensating circuit PN1, PN2, the PN3 is recharged and be 2 power ratio.That is, satisfy following relation.

Vpn3＝2×Vpn2＝2×2×Vpn1

Secondly, relevant action is described.Just often, promptly digital signal D1～D3 is 0 o'clock entirely, and steady short-circuit switch 8 is an on-state, and electric current flows through steady short-circuit switch 8.At this moment, suppose that the side of upper arm one side 17a, 17b among thyristor 17a～17d or underarm one side 17c, 17d is on-state, then the opposing party is an off-state.

And when the voltage of electric power system descends, each voltage compensating circuit PN1, PN2, PN3 according to the digital signal D1 that produces by error voltage～D3 selection, when the polarity of electric power system is timing, owing to make switch element 17b, 17c conducting, switch element 17a, 17d end, and just export charging voltage with positive polarity by switch element 17b, 17c.And when the polarity of electric power system when negative because switch element 17a, 17d conducting, switch element 17b, 17c are ended, just export charging voltage with negative polarity by switch element 17a, 17d.In addition, as for becoming 0 signal among each digital signal D1～D3, for example the signal D1 of lowest order is 0 o'clock, among the voltage compensating circuit PN1 because upper arm one side 17a, 17b or underarm one side 17c, 17d which side for conducting then the opposing party for ending, so the output short circuit, the output that comes from voltage compensating circuit PN1 is almost 0.Therefore, catch up with that to state embodiment 1 same, carry out voltage compensation.

Like this among voltage compensating circuit PN1, the PN2 of Gou Chenging, the PN3, each personal charging just can be exported and positive and negative two bucking voltages that polarity is corresponding with diode 12 and charging capacitor 18, thereby reaches miniaturization and reduce cost.

Then, relevant the 2nd example that illustrates at Fig. 6 (b) is described.

As shown in the figure, voltage compensating circuit PN1 possesses: connect semibridge system transducer that 2 thyristor 19p1,19n1 of diode constitute, 2 the thyristor 20p1, the 20n1 differential concatenation that are connected diode by reverse parallel connection connected by reverse parallel connection, voltage compensating circuit PN1 output be connected in parallel low change over switch of wink, use the secondary coil 14 of transformer 200 with diode 12 and charging as charging capacitor 21p1, the 21n1 of energy storing device and the charging that is used for charging capacitor 21p1,21n1.

And,, be arranged in parallel steady short-circuit switch 8 with voltage compensating circuit PN1 at the output of voltage compensating circuit PN1.

At this moment catch up with also that to state embodiment 1 same, voltage compensating circuit PN1 and voltage compensating circuit PN2, PN3 (scheming not shown) with charging capacitor 21 that charging voltage is different separately are connected in series in the electric power system.

At this moment, same control signal X, Y, the Z of low control circuit 16 generations control by the voltage wink shown in Figure 2 of the foregoing description 1, voltage compensating circuit PN1 for example shown in the figure, give switch element 19p1 signal Xp1 respectively, signal Xn1 gives switch element 19n1, signal Yp1 gives switch element 20p1, and signal Yn1 gives switch element 20n1, and signal Z gives steady short-circuit switch 8.Therefore, when the voltage of electric power system descends, for example when polarity for just, the signal D1 of lowest order is 1 o'clock, among the voltage compensating circuit PN1, Xp1 becomes 1, Yp1 becomes 0, is exported the voltage Vp1 of charging capacitor 21p1 by switch element 19p1.When polarity when negative, Xn1 becomes 1, Yn1 becomes 0, by the voltage Vn1 of switch element 19n1 output charging capacitor 21n1.Signal D1 also caught up with that to state embodiment 1 same at 0 o'clock, because constitute change over switch 20p1, the 20n1 conducting of low change over switch of wink, so the output short circuit, the output that comes from voltage compensating circuit PN1 is almost 0.Therefore carry out the same voltage compensation action shown in Fig. 3 of the foregoing description 1.

Like this, in the voltage compensating circuit PN1, the PN2 that constitute, PN3, charging capacitor 21p, 21n charging anodal, negative pole that available common charge path is given, charging can be one with diode 12, charging is lacked to one just to become with the tap of transformer secondary output coil 14, thereby realizes miniaturization and cost degradation.

Embodiment 3

Then, relevant embodiments of the invention 3 are described.

Fig. 7 is the voltage fluctuation compensation device pie graph of the embodiment of the invention 3.

In the foregoing description 1, constitute compensating unit 110 with a pair of voltage compensating circuit P, N, and in present embodiment 3, solve voltage compensating circuit P that produces cathode voltage and the voltage compensating circuit N that produces cathode voltage respectively, for example as shown in the figure, be connected in series voltage compensating circuit P3, voltage compensating circuit P2, voltage compensating circuit P1, voltage compensating circuit N1, voltage compensating circuit N2, voltage compensating circuit N3 of order constitutes whole compensating circuits 120, and possessing the steady short-circuit switch 8 of high speed machine formula, its output is with all compensating circuits 120 are in parallel.

Each voltage compensating circuit P1～P3, N1～N3 catch up with that to state embodiment 1 same, have low compensating switch 10 of low change over switch 9 of the wink that is equipped with in parallel, wink at output, as the charging capacitor 11 of energy storing device.

Each charging capacitor 11 is connected in parallel respectively and sets with resistance 22 with the charging voltage correspondent voltage that requires, and possesses the charging transformer secondary output coil 14 that in the lump whole charging capacitors 11 is charged.Charging is received the tie point of voltage compensating circuit P1 and voltage compensating circuit N1 with the centre tap of transformer secondary output coil 14, and possesses charging respectively with diode 12 in side of the positive electrode and negative side, with positive side charging path and minus side charge path, according to the charging voltage of the voltage setting that is connected in parallel, to each charging capacitor 11 charging with the ratio dividing potential drop of resistance 22.

Each resistance 22 is selected following (n and p are same) roughly.

(resistance of 22p3)=2 * (resistance of 22p2)

=2 * 2 * (resistance of 22p1).

So, can set the voltage of each charging capacitor 11 equally with the foregoing description 1.

And, set relatively with the voltage of each charging capacitor 11 that is connected in parallel with resistance 22, enough little electric current brownout resistance 23 is inserted between the tie point of the charge centre tap of using transformer secondary output coil 14 and voltage compensating circuit P1, N1.

In addition, in this formation,, can not and hang down change over switch 9 wink via electric current brownout resistance 23 and stop streaming currents with the charge path difference of charging capacitor 11.Therefore, in this formation, system voltage when steady short-circuit switch 8 is in conducting state, be controlled low change over switch 9 of each wink just often, makes it also all become off-state.In addition, the control except that at this moment is all same with the foregoing description 1.

That is,, control low change over switch 9 of wink, forcibly make it become off-state before the t0 of Fig. 3 and after the t2.Therefore, charge path disconnects with system, prevents that charging voltage is to system leak.Yet, become at steady short-circuit switch 8 disconnection Fig. 3 moment t0～t2 during because wink low change over switch 9 any become connection, charging voltage all can let out by low change over switch 9 of wink.At this moment,, flow through charging with transformer 200 leakage currents with diode 12, limited, therefore can prevent to charge and use the destruction of transformer 200 by means of electric current brownout resistance 23 via wink low change over switch 9, charging from middle tap.Like this, electric current brownout resistance 23 is exactly the (element of leakage current of t0～t2) when suppressing wink low compensation, and and voltage setting following relation of establishment between the resistance 22, when making charging capacitor 11 chargings, just the electric current brownout is hindered 23 voltage drops and be controlled at unchallenged degree.

(voltage is set the resistance with resistance 22p1)＞＞

In (resistance of electric current brownout resistance 23) present embodiment, owing to make charging capacitor 11 chargings with the common secondary coil 14 that charges with transformer 200, so 14 of secondary coils with the structure of a tap of intermediate point just, can be extremely simple, reach the miniaturization and the cost degradation of voltage fluctuation compensation device 100.

In addition, in the foregoing description 1～3, be connected in series voltage compensating circuit P1～P3, N1～N3, or voltage compensating circuit PN1～PN3 promptly adopt 3 compensating units 110, yet are not limited thereto, and compensating unit 110 numbers are many more, and it is meticulous more to carry out voltage compensation.

Embodiment 4

Then, by Fig. 8 embodiments of the invention 4 are described.

In the voltage fluctuation compensation device 100 shown in the foregoing description 1,2, charging constitutes charge loop with transformer 14, charging capacitor 11, charging with diode 12, after the voltage compensation release, in the above-mentioned charge loop, the transformer secondary output coil 14 → charging capacitor 11 that flowing → charging charging current of diode 12 directions.Here, long during the voltage compensation action, the voltage of charging capacitor 11 descends under the big situation, and this charging current will increase, has the worries such as destruction that secondary coil 14 scaling loss, charging are used diode 12 take place.So, in the present embodiment 4, electric current brownout resistance 24 is set in charge loop.Therefore in the time of can preventing to charge, the overload current that flows in the charge loop can prevent to constitute the circuit block abnormal heating, destruction of charge loop etc.

Embodiment 5

Then, the voltage fluctuation compensation device 100 about the Fig. 1 with the foregoing description 1 illustrates same formation describes the steady short-circuit switch 8 that relevant all compensating circuit 120 outputs are arranged in parallel in detail according to Fig. 9.

As shown in the figure, at the mains side or the load side that constitute the electric power system that parallel circuits is connected by full compensating circuit 120 and steady short-circuit switch 8, the measurement section 35a of allocating and measuring curtage etc.And the also 35b of allocating and measuring portion on the current path that flows through steady short-circuit switch 8.

According to the electrical information of coming from these measurement section 35 (35a, 35b), voltage wink, low control circuit 16 was with appropriate time above-mentioned each voltage compensating circuit P1～P3, N1～N3 of control and steady short-circuit switch 8.

Action with steady short-circuit switch 8 is the center then, and the action of relevant voltage fluctuation compensation device 100 is described.This voltage fluctuation compensation device 100, situations about descending at the voltage of electric power system etc. are in order to compensate its voltage, send normal voltage to load side (user 3), at first, system voltage just often, steady short-circuit switch 8 is in on-state, and electric current flows through this steady short-circuit switch 8.Therefore the power consumption of voltage fluctuation compensation device 100 is extremely little.

Next illustrates that the low abnormal conditions that wait of wink take place relevant system voltage.Though it is the purpose of this device that the decline of voltage is compensated, and makes the electric current that flows to steady short-circuit switch 8 turn to full compensating circuit 120 before this, promptly need blocking rapidly to flow into the electric current of steady short-circuit switch 8.Figure 10 is this go to action figure of explanation, and, among Figure 11.Typicalness illustrates the voltage that comprises electric power system and descends and above-mentioned go to action then, and the current-voltage waveform that is caused by voltage fluctuation compensation device 100 compensating movements changes.

With frequent monitor voltage of the measurement section 35a of mains side and electric current, as shown in figure 11, at moment t1, electric voltage exception takes place and it is measured.Voltage wink, low control circuit 16 sent open command for steady short-circuit switch 8 at once.If t1 mains side voltage (system voltage) V1 descends constantly, steady short-circuit switching current I2 also just descends thereupon.According to open command, the contact of steady short-circuit switch 8 leaves and electric arc takes place at moment t1a, yet generally in the same old way until electric current nature zero point, electric currents do not continue flow and can not carry out voltage compensation in the past and move in the steady short-circuit switch 8.Thereby, electric arc takes place between the contact of steady short-circuit switch 8, the moment t2 of distance between the convertible contact then, as shown in figure 10, with full compensating circuit 120 for example the compensating switch 10n1 of voltage compensating circuit N1 become connection, the wink of other voltage compensating circuit N2, N3, P1～P3, low change over switch 9 became connection.So the electric charge of pre-charge in the charging capacitor 11n1 flows to the momentary interruption closed circuit 36 of conduct by the closed-loop path of steady short-circuit switch 8 with the opposite current polarity that flows through steady short-circuit switch 8.In addition, so-called moment t2 to distance between convertible contact is meant when conversion finishes being added to voltage between contact before the distance that can bear, the moment that contact leaves.

The frequency that flows to the discharging current 37 that above-mentioned momentary interruption comes with the charging capacitor 11n1 of closed loop 36 is by the static capacity of charging capacitor 11n1 and the impedance decision of this closed circuit 36, for example the such commercial frequency of 50Hz, 60Hz enough height just.Thereby the high-frequency current (discharging current) 37 flowing through overlapping momentary interruption usefulness closed loop 36 on the commercial frequency electric current of steady short-circuit switch 8 at moment t3, forms mandatory current zero 38 to steady short-circuit switching current I2.At this impressed current 0. 38, steady short-circuit switch 8 breaking currents, the electric current that becomes system then flows to whole compensating circuits 120.

As shown in figure 11, at moment t2～t3, steady short-circuit switching current I2 reduces, and opposite all compensating circuit electric current I 3 are increasing.The ratio of this increase is according to being decided with the charging capacitor 11n1 static capacity of closed loop 36 and the frequency of impedance decision by above-mentioned momentary interruption.

After current conversion had just finished to whole compensating circuits 120, full compensating circuit 120 was according to the control of low control circuit 16 of voltage wink, carried out the compensating movement same with the foregoing description 1.

Although when steady short-circuit switch 8 hanged down in system voltage wink,, need to disconnect as quick as thought at possible limit transient compensation voltage.

Figure 12 is the profile when constituting the steady short-circuit switch 8 of high speed machine formula by the vacuum switching device that utilizes electromagnetic repulsion power.Among the figure, the 41st, the vacuum tube of switching circuit junction portion, the 42nd, the fixation side terminal of connection vacuum tube 41, the 43rd, movable side terminal, system power flows into the circuit that is made of the movable side terminal 43 of fixation side terminal 42-vacuum tube 41-.Scheming unshowned is fixed contact and travelling contact in the vacuum tube 41.The 44th, be used to open and close the electromagnetic repulsion portion of the drive division of vacuum tube 41 contacts, the 45th, be used to make the spring mechanism portion of the off-state of the contact force of contact contact and retaining contact.In the steady short-circuit switch 8 of Gou Chenging, send certainly about the about later on 1ms of open command like this, can break away from the contact in the vacuum tube 41, can be described as a kind of structure that is fit to instantaneous blocking.And be mechanical contact, the loss when still switching on is minimum.

In the foregoing description 5, when steady short-circuit switch 8 opened circuit beginning, the charging capacitor 11 outflow discharging currents 37 from full compensating circuit 120 made the steady short-circuit switching current produce mandatory current zero 38, can instantaneous blocking steady short-circuit switching current.Thereby, after voltage takes place unusually, the instantaneous compensating movement that just can begin voltage decline.And the device or the control device that are used to produce impressed current zero point do not need other way, to be fit to the structure of miniaturization, low price, obtain the high voltage fluctuation compensation device of reliability.

In addition, in the foregoing description,,,, also can flow out discharging current 37 by other charging capacitor 11n2,11n3 or its combination as long as the polarity of discharging current 37 is identical though the charging capacitor 11n1 in full compensating circuit 120 flows out discharging current 37.

And, the switching motion of the switch of steady short-circuit shown in the foregoing description 8, the foregoing description 3 of steady short-circuit switch 8 also can be used equally even be connected in parallel on the full compensating circuit 120, and the voltage fluctuation compensation device 100 of not only be connected in series a plurality of voltage compensating circuit P1～P3, N1～N3, and when constituting voltage fluctuation compensation device and be connected in series in the electric power system, can use too with voltage compensating circuit.

And then, in the foregoing description, when steady short-circuit switch 8 disconnects beginning, charging capacitor 11n1 in full compensating circuit 120 flows out discharging current 37, the electric current of steady short-circuit switch 8 is flow through in blocking, yet, also can use other conversion equipment because the electric current of supply and this current reversal can make the instantaneous blocking of the electric current that flows through steady short-circuit switch 8.

Embodiment 6

Then, relevant embodiments of the invention 6 are described.

Figure 13 is the voltage fluctuation compensation device signal pie graph of the embodiment of the invention 6.

As shown in the figure, on full compensating circuit 120 outputs of a plurality of voltage compensating circuit P, N that all are connected in series, with in the voltage fluctuation compensation device of whole compensating circuit 120 parallel high-speed mechanical stability short switches 8, the two ends of full compensating circuit 120 cut- off switch 51,52 separately are connected in series on whole compensating circuits 120.This cut- off switch 51,52 is configured in full compensating circuit 120 sides near the contact 53,54 of whole compensating circuits 120 with steady short-circuit switch 8.

The then relevant action of explanation.Full compensating circuit 120 is when degradation is unusual under system voltage, should compensate its not enough voltage, voltage just often, steady short-circuit switch 8 is in on-state, 54 the circuit impedance from contact 53 to contact, steady short-circuit switch 8 lateral circuit sides are lower than the circuit of cut- off switch 51,52 and full compensating circuit 120 formations, thereby the most of steady short-circuit switch 8 that flows into of electric current, suppress voltage fluctuation compensation device 100 loss just often greatly.At this moment, cut- off switch 51,52 is an on-state.In case unusual by degradation under this state generation systems voltage, steady short-circuit switch 8 is disconnected, as above-mentioned embodiment 1 said, full compensating circuit 120 compensated the action of undertension part.

Although in this full compensating circuit 120, when needing inspection or repairing,, carry out detection, the repairing of full compensating circuit 120 so disconnect cut- off switch 51,52 just often because electric current flows through steady short-circuit switch 8.

And full compensating circuit 120 carried out among the power supply compensating movement when system voltage descended, and carried out the detection of full compensating circuit 120 or when repairing, and steady short-circuit switch 8 is connected and is disconnected cut- off switch 51,52.

In the foregoing description, the two ends of full compensating circuit 120 possess cut- off switch 51,52 separately.Check or repair when the full compensating circuit 120, connect steady short-circuit switch 8 and cut- off switch 51,52 is disconnected.Thereby, in the same old way from primary side terminal (mains side) to primary side (load side) supply capability, and load side can not have a power failure, and just becomes power supply serially if voltage can not compensate when descending.And at this moment, because cut- off switch 51,52 is disconnected, full compensating circuit 120 becomes no-voltage condition, does not worry to get an electric shock, and can check or repair.

In addition, in the present embodiment, used cut- off switch 51,52, for example as shown in figure 14, the joint 61 that employing is made of joint convex terminal 61a and the recessed terminal 61b of joint the full compensating circuit 120 that is equipped with wheel 63 mounting under movable state on the base plate 62, is extracted out from electric power system, when insulation ground leaves the action of necessary distance, disconnect with system on also can be electric at joint 61 places.

Embodiment 7

Figure 15 is the voltage fluctuation compensation device signal pie graph of the embodiment of the invention 7.

As shown in the figure, at full compensating circuit 120 outputs of a plurality of voltage compensating circuit P, N that all are connected in series, possess in the voltage fluctuation compensation device 100 of the high speed machine formula steady short-circuit switch 8 of following full compensating circuit 120 parallel connections, the two ends of full compensating circuit 120 are connected in series with cut- off switch 51,52 with full compensating circuit 120 respectively.This cut- off switch 51,52 is disposed at the outside (with full compensating circuit 120 opposition sides), near the tie point 53,54 of full compensating circuit 120 with steady short-circuit switch 8, and then on the tie point 53,54 in the outside, be connected in parallel to bypass with switch 57 with the circuit of be connected in parallel full compensating circuit 120 and steady short-circuit switch 8.

The then relevant action of explanation.Full compensating circuit 120 is to compensate its not enough electric power when degradation is unusual under the system voltage, yet voltage just often, steady short-circuit switch 8 is an on-state, tie point 53 is to the circuit impedance of tie point 54, because steady short-circuit switch 8 lateral circuits one side is lower than the circuit that is made of full compensating circuit 120, the electric current major part flows through steady short-circuit switch 8, and suppresses the loss just often of voltage fluctuation compensation device 100 greatly.At this moment, cut- off switch 51,52 is an on-state, and bypass is an off-state with switch 57.In case unusual by degradation under this state generation systems voltage, steady short-circuit switch 8 is disconnected, as above-mentioned embodiment 1 said, carry out the action of full compensating circuit 120 bucking voltage insufficient sections.

Although in this full compensating circuit 120 or steady short-circuit switch 8, when inspection or repairing needing occurring, just bypass is connected with switch 57, and cut- off switch 51,52 is disconnected.

In this voltage fluctuation compensation device 100, even full compensating circuit 120 and steady short-circuit switch 8 are checked when repairing, can not have a power failure to primary side (load side) supply capability from primary side (mains side) in the same old way, just become power supply serially if voltage can not compensate when descending in load side.And at this moment, because cut- off switch 51,52 is disconnected, full compensating circuit 120 becomes no-voltage condition, does not worry to get an electric shock, and still can check or repair.

In addition, shown in Figure 16 (a), Figure 16 (b), under the situation that is not equipped with steady short-circuit switch 8, just often, bypass is an off-state with switch 57, electric current flows through the switch element that hangs down change over switch 9 wink of full compensating circuit 120 shown in Figure 17 and follows the circuit of its diode that is connected in parallel, and when system voltage descends, carries out the same compensating movement of the foregoing description with full compensating circuit 120.

At this moment also same with the foregoing description 7, occur in the full compensating circuit 120 needing to check or when repairing, bypass is connected with switch 57, check and repair.At this moment among Figure 16 (a), adopt the way that cut- off switch 51,52 is disconnected, make full compensating circuit 120 become no-voltage condition, do not worry to get an electric shock, can check or repair.

Embodiment 8

Then, the relevant embodiment of the invention 8 is described.

Figure 18 is the voltage fluctuation compensation device pie graph of the embodiment of the invention 8.

As shown in the figure, in the foregoing description 1,, be provided for making the continuous-current plant 70 of low control circuit 16 actions of voltage wink at this moment with in the voltage fluctuation compensation device shown in Fig. 4 100.This continuous-current plant 70 is connected electric power system by primary side step-down with transformer 71 be connected step-down and constitute with transformer 71 primary side and the converter circuit 74 formed by rectification circuit 72 and capacitor 73.

The action of relevant continuous-current plant 70 then, is described.

The continuous-current plant 70 that control circuit is used from introducing power supply as the power transmission line 1 that carries out the voltage compensation object, at the step-down transformer 71 that connects power transmission line 1, converts the voltage that is used for low control circuit 16 of voltage wink to.Step-down is connecting converter circuit 74 with the primary side of transformer 71, and interchange is converted to direct current.Make output voltage stabilization by the capacitor 73 that is arranged at converter circuit 74 outputs, and with control circuit direct voltage V _DCService voltage wink is hanged down control circuit 16.

Although because from introducing power supply as the power transmission line 1 that carries out the voltage compensation object, the power system voltage of power transmission line 1 descends and carries out when the compensating movement, the output voltage that service voltage wink is hanged down control circuit 16 also descends.Thereby, increase the discharge time constant of converter circuit 74 capacitors 73, so that guarantee the output voltage of low control circuit 16 regular events of voltage wink.

When taking place on the system voltage to hang down in wink, the output voltage V of converter circuit 74 _DC, as shown in figure 19, descend in time.For example in the compensating movement time of voltage fluctuation compensation device 100 t, the output of the converter circuit 74 Δ V that only descends.If being supplied with minimum voltage, the direct voltage of low control circuit 16 requirements of voltage wink is made as Vmin, in case Δ V becomes greater than (V here, _DC-Vmin), the voltage that hangs down control circuit 16 in the compensating movement service voltage wink can become below the Vmin, and voltage wink, low control circuit 16 can't operate as normal.Therefore, in the present embodiment, supply with minimum voltage Vmin by the compensating movement time t1 of voltage fluctuation compensation device 100 and the direct voltage of low control circuit 16 requirements of voltage wink, obtain the voltage sloping portion Δ Va that allows, the output voltage rate of descent of converter circuit 74 is become below the Δ Va/t1.Here, can continue to increase capacitor 73 capacity, capacitor 73 discharge time constants of converter circuit 74 outputs are become more than the setting.

In the present embodiment,, can prevent that the action of low control circuit 16 of voltage wink from occurring unusually, and improve the reliability of voltage fluctuation compensation device 100 even system voltage also can be supplied with the direct voltage that needs to hanging down control circuit 16 voltage wink in descending.

In addition, in the above-described embodiments, though show from introduce the continuous-current plant 70 of power supply as the power transmission line 1 that carries out the voltage compensation object, as shown in figure 20, also can use the DC power supply 75 of power transmission line 1 electric power system in addition that is connected to the voltage compensation object.At this moment, the electric power system of so-called voltage fluctuation compensation device 100 voltage compensations, supply with direct voltages from the DC power supply 75 that connects other system to hanging down control circuit 16 voltage wink, even thereby take place in the electric power system of target compensation wink not influenced by it when low, can stably provide direct voltage to hanging down control circuit 16 voltage wink, DC power supply 75 also can adopt battery pack, solar cell, wind power generation plant etc., can obtain same effect.

Embodiment 9

Then, the embodiment of the invention 9 is described.

In general, have defencive function in the electric power system, unusual by means of overcurrent relay and under-voltage relay detection system protected the breaker open circuit thus.Constitute the protection breaker like this, as long as which side abnormal signal of overcurrent relay or under-voltage relay just interdicts action.During the accident that is short-circuited in its electric power system, because of big electric current flows through and the decline of short circuit accident generation voltage, descend both so monitor overcurrent and voltage, is because which side relay fault also can correctly be measured accident according to the abnormal signal that comes from the opposing party's relay.

At embodiments of the invention 9, have in the electric power system of above-mentioned this common defencive function according to explanation below Figure 21 is relevant, import the situation of the voltage fluctuation compensation device shown in the foregoing description 1.

As shown in the figure, the electric power of power transmission line 1 at first by protection breaker 80, is input to voltage fluctuation compensation device 100 by circuit 81a with transformer 2 step-downs, and the output of voltage fluctuation compensation device 100 connects each user 3 and supply capability by circuit 81b.Protection breaker 80; when systematic failures, cut off circuit 81b from transformer 2 as voltage source; thereby, be set to the galvanometer 83 of the overcurrent relay 82 that over-current detection uses and be the potentiometer 85 of the under-voltage relay 84 of under-voltage detection usefulness at the circuit 81a of this protection breaker 80 below just.

The electric current one of circuit 81a surpasses setting, overcurrent relay 82 with regard to output signal " 1 ", this be worth with next output signal " 0 ", and output signal becomes the 1st of OR circuit 86 and imports.On the other hand, with regard to output signal " 1 ", this output signal " 0 " then more than value, its output signal will become the 1st input of the AND circuit 88 that voltage fluctuation compensation device 100 outputs possess to the voltage of under-voltage relay 84 ifs circuit 81a less than setting.In voltage fluctuation compensation device 100, for example hanged down the NO T signal input AND circuit 88 of the signal Z of control circuit 16 voltage shown in Figure 2 wink.That is, output signal " 0 ", voltage compensation action stop middle output " 1 " in the voltage compensation action, and this output signal is the 2nd input of AND circuit 88.AND circuit 88 is output as the 2nd input of OR circuit 86, and the output of OR circuit 86 is as circuit blocking instruction 89 input protection breakers 80.Protection breaker 80 was failure to actuate when circuit blocking instruction 89 was " 0 ", interdicted action during for " 1 ".

Among Figure 21, the electric power system of power transmission line 1 is normal, and when the system in downstream was also no abnormal, the output of overcurrent relay 82 and under-voltage relay 84 all was " 0 ", and because the voltage compensation action stops, voltage fluctuation compensation device 100 is output as " 1 ".In " 0 ", " 1 " the input AND circuit 88, its output becomes " 0 ".So " 0 ", " 0 " are input in the OR circuit 86, its output becomes " 0 ", and protection breaker 80 does not have the blocking action.

Because of the emergency system voltage of power transmission line 1 descends, 100 moments of voltage fluctuation compensation device enter compensating movement, the signal " 0 " in the action of output expression voltage compensation.On the other hand, why make the operating lag of under-voltage relay 84, the voltage of measuring circuit 81a descends, under-voltage relay 84 output voltage decline detection signals 87, and promptly signal " 1 " is for after voltage fluctuation compensation device 100 action beginnings.And the output of overcurrent relay 82 becomes " 0 ".So to AND circuit 88 input " 0 ", " 1 ", output becomes " 0 ", thereby to OR circuit 86 input " 0 ", " 0 ", output becomes " 0 ", and protection breaker 80 does not interdict action.Therefore voltage fluctuation compensation device 100 carries out the compensating movement of under voltage, electric power is provided for user 3.

Like this, at the output of voltage fluctuation compensation device 100 configuration AND circuit 88, in the voltage compensation action, make its prevention and make the protection breaker 80 that is not sent to electric power system from the voltage drop detection signal 87 of under-voltage relay 84 outputs.

Promptly; become circuit blocking instruction 89 the voltage drop detection signals 87 of protection breaker 80 from under-voltage relay 84; in the voltage compensation action of voltage fluctuation compensation device 100, do not play circuit blocking instruction 89 effects, make protection breaker 80 not interdict action.Thereby, when voltage fluctuation compensation device 100 hanged down in system voltage wink, can carry out the good voltage compensation action of reliability, compensated voltage can be given load user 3.

In addition, in the present embodiment, the output that is illustrated in electric power system is provided with the situation of voltage fluctuation compensation device 100, but in user's 3 inner situations about being provided with too.

And in the present embodiment; make a kind of voltage drop detection signal 87 of under-voltage relay 84; in the voltage compensation action of voltage fluctuation compensation device 100, be not sent to the formation of protection breaker 80, yet can in the voltage compensation action, under-voltage relay 84 be failure to actuate yet.

And, in the foregoing description, adopt the voltage fluctuation compensation device shown in the foregoing description 1, yet connecting electric power system, according to the supervision that power system voltage descends, also can use by the voltage fluctuation compensation device of power supply control output bucking voltage.

Though the charging voltage of charging capacitor also can be used the combination of other voltage ratio than the power ratio that is set at about 2 in each compensation arrangement in the various embodiments described above.Voltage ratio is about 2 power ratio, but the repetition that its combination does not produce the service voltage value is the most suitable.

In each embodiment, though energy storage device is to use capacitor to represent, also available other, for example use storage battery etc.

The invention effect

As previously discussed, the described voltage fluctuation compensation device in the 1st aspect of the present invention is: possess the energy storing device of storing respectively different voltages, a plurality of voltage compensating circuits of the converting direct-current voltage into alternating-current voltage output of storing on this energy storing device are connected in series in the power system, during the voltage drop of above-mentioned power system, from above-mentioned a plurality of voltage compensating circuits, select the combination of requirement, compensate the voltage drop of above-mentioned power system with its output voltage summation, thereby can cheaply consist of the device that promotes miniaturization, make simultaneously superfine high-accuracy voltage compensation become possibility.

And the described voltage fluctuation compensation device in the 2nd aspect of the present invention, according to the 1st aspect, the different absolute value of voltage that are stored in respectively the energy storing device in a plurality of voltage compensating circuits are to this voltage compensating circuit output voltage (absolute value) of minimum roughly 2^KDoubly (K=0,1,2 ...), thereby can be by grade control and compensation voltage uniformly-spaced, and then high accuracy is carried out voltage compensation.

And the described voltage fluctuation compensation device in the 3rd aspect of the present invention is, according to the 1st aspect or 2, each output at one or a plurality of above-mentioned voltage compensating circuits of being connected in series possesses be used to the high speed machine formula short switch that makes the voltage compensating circuit bypass, when the voltage of power system is normal, connecting all, this short switch makes whole above-mentioned voltage compensating circuit bypasses, during the voltage drop of above-mentioned power system, disconnect all this short switches, compensated the voltage drop of above-mentioned power system by the next Voltage-output of above-mentioned voltage compensating circuit, thereby can reduce loss when normal, cooling device with low capacity just can make the cheap miniaturization of whole device.

And the described voltage fluctuation compensation device in the 4th aspect of the present invention is, according to the 1st aspect or 2, at the full compensating circuit output that is consisted of by the whole voltage compensating circuits that are connected in series, possess be used to the high speed machine formula short switch that makes the voltage compensating circuit bypass with this full compensating circuit parallel connection, when the voltage of power system is normal, connecting all, this short switch makes above-mentioned voltage compensating circuit bypass, disconnect this short switch during the voltage drop of above-mentioned power system, compensated the voltage drop of above-mentioned power system by the next Voltage-output of above-mentioned full compensating circuit, thereby can reduce loss when normal, cooling device with low capacity just, and the number of short switch can need only one, therefore can make the cheap miniaturization of whole device.

And the described voltage fluctuation compensation device in the 5th aspect of the present invention is, according to the 4th aspect, when causing that because of the voltage drop of power system the disconnection of short switch begins, in the closed-loop path that is consisted of by full compensating circuit and above-mentioned short switch, along with the predetermined energy storage device in above-mentioned full compensating circuit flows out discharge current, form mandatory current zero for the commercial frequency alternating current that flows through above-mentioned short switch, this alternating current of instantaneous blocking, thereby, because the discharge current that the part of full compensating circuit flows, moment begins the compensating movement of voltage drop behind the voltage abnormal, makes the voltage compensation of high reliability become possibility.

And the described voltage fluctuation compensation device in the 6th aspect of the present invention is, according to the 5th aspect, carry out possessing to the supervision of voltage drop in the power system with based on this detection control part that carries out power supply control: during the voltage drop of above-mentioned power system, detect the device of the current polarity that flows through above-mentioned short switch; And to control the voltage compensating circuit of selecting requirement, energy storing device in this voltage compensating circuit, flow and catch up with the device of the discharge current of stating the mobile opposite current polarity of short switch, thereby be that the cheap device of miniaturization that promotes consists of, make the voltage compensation of high reliability become possibility.

And the described voltage fluctuation compensation device in the 7th aspect of the present invention is, possesses energy storing device, the DC voltage of this energy storing device storage is converted to the voltage compensating circuit that exchanges output to be connected in series in the power system, and with the above-mentioned voltage compensating circuit high speed machine formula short switch that is connected in parallel, when the voltage of above-mentioned power system is normal, closed this short switch makes above-mentioned voltage compensating circuit bypass, during the voltage drop of above-mentioned power system, disconnect this short switch, by the next Voltage-output of above-mentioned voltage compensating circuit, compensate the voltage drop of above-mentioned power system, thereby, can reduce the loss when normal, make with cheap, miniaturization consists of voltage compensation becomes possibility.

And the described voltage fluctuation compensation device in the 8th aspect of the present invention is, according to the 7th aspect, when causing that because of the voltage drop of power system the disconnection of short switch begins, in the closed-loop path that is consisted of by voltage compensating circuit and above-mentioned short switch, along with the energy storing device of repaying from above-mentioned voltage in the circuit flows out discharge current, form mandatory current zero for the commercial frequency alternating current that flows through above-mentioned short switch, this alternating current of instantaneous blocking, thereby because the discharge current that uses the part of voltage compensating circuit to flow, can be behind the voltage abnormal moment begin the compensating movement of voltage drop, make the voltage compensation of high reliability become possibility.

And the described voltage fluctuation compensation device in the 9th aspect of the present invention is, according to the 3rd aspect, 4 and 7 each, short switch possesses the high speed reversing arrangement, so that when the voltage drop of power system causes that the disconnection of this short switch begins, with the electric current of supply with this opposite current direction, the electric current of this short switch is flow through in instantaneous blocking, thus the compensating movement of voltage drop can be behind the voltage abnormal moment, make the voltage compensation of high reliability become possibility.

And the described voltage fluctuation compensation device in the 10th aspect of the present invention is, according to the 3rd aspect～9 each, short switch is that electromagnetic repulsion power is used for the mechanical switch that the contact opening operation disconnects, thereby the loss in when energising is minimum, and become the short switch that is fit to moment blocking structure, accurately carry out the high voltage compensation of reliability.

And the described voltage fluctuation compensation device in the 11st aspect of the present invention is, according to the 1st aspect～4 each, each voltage compensating circuit possesses for the compensating switch that the voltage of storing on the energy storing device is accessed power system and the change-over switch that is parallel-connected to this voltage compensating circuit output, above-mentioned compensating switch and above-mentioned change-over switch, thyristor by reverse parallel connection connection diode consists of respectively, thereby accurately carries out the good voltage compensation of precision.

And the described voltage fluctuation compensation device in the 12nd aspect of the present invention is, according to the 1st aspect～4 each, each voltage compensating circuit possesses respectively 4 full-bridge converter that thyristor consists of that connected diode by reverse parallel connection, polarity during according to the voltage drop of power system, by positive and negative the two one of polarity, the voltage of storing on the output energy storing device accurately carries out the good voltage compensation of precision.

And the described voltage fluctuation compensation device in the 13rd aspect of the present invention is, according to the 1st aspect～4 each, each voltage compensating circuit possesses 2 thyristors that reverse parallel connection respectively connects diode to carry out opposite direction and is connected in series, and the change-over switch of this voltage compensating circuit output that is connected in parallel be connected reverse parallel connection respectively and connect 2 half bridge converters that thyristor consists of of diode, polarity during according to the voltage drop of power system, output be stored in the output generating positive and negative voltage a pair of energy storing device the two one of voltage, thereby accurately carry out the good voltage compensation of precision.

And the described voltage fluctuation compensation device in the 14th aspect of the present invention, according to the 1st aspect～13 each, energy storing device be with charging with transformer and charging with the capacitor of diode charging, thereby accurate output bucking voltage.

And the described voltage fluctuation compensation device in the 15th aspect of the present invention is, according to the 14th aspect, at the charging that is consisted of with diode and capacitor with transformer secondary output coil, charging by charging insertion current limit resistance in the closed-loop path, thereby when charging, can prevent that charging from overcurrent flows in the closed circuit, can prevent circuit block abnormal heating and destruction.

And the described voltage fluctuation compensation device in the 16th aspect of the present invention is, according to the 11st aspect, energy storing device is the capacitor of using diode charging with above-mentioned charging with transformer and charging, and pass through the common secondary coil of above-mentioned charging transformer to the above-mentioned capacitor charging of a plurality of voltage compensating circuits, thereby simplified the device formation.

And the described voltage fluctuation compensation device in the 17th aspect of the present invention is, according to the 16th aspect, the charging transformer secondary output coil that the capacitor that possesses whole voltage compensating circuits is connected in parallel and these whole capacitors are charged in the lump with resistance corresponding to charging voltage that requires respectively, at the positive pole of this charging with the transformer secondary output coil, between the intermediate point of two terminals of negative side and this side of the positive electrode terminal, output voltage all is connected in series the capacitor of positive polarity, between above-mentioned intermediate point and above-mentioned negative side terminal, output voltage all is connected in series the capacitor of negative polarity, on the tie point of the capacitor of the capacitor of above-mentioned positive polarity and above-mentioned negative polarity, connect the output that above-mentioned charging uses the intermediate point of transformer secondary output coil, charging voltage according to the ratio dividing potential drop of the above-mentioned resistance that is connected in parallel, to above-mentioned capacitor charging, thereby significantly simplify to charge and use the secondary coil of transformer, promote the device of miniaturization to consist of with cheapness, accurately carry out the good voltage compensation of precision.

And the described voltage fluctuation compensation device in the 18th aspect of the present invention is, according to the 17th aspect, between the tie point of charging with the capacitor of the capacitor of the intermediate point of transformer secondary output coil and positive polarity and negative polarity, compare with the resistance that is connected in parallel on each capacitor, insert fully little current limit resistance, thereby can limit with good reliability the leakage current of charging voltage, can prevent that charging from going to pot with transformer.

And the described voltage fluctuation compensation device in the 19th aspect of the present invention is, according to each of the 14th aspect～18, the charging transformer of giving capacitor charging is that primary side connects in the power system, thereby capacitor is when system voltage is normal, can automatically slowly charge, and make device small-sized simple.

And the described voltage fluctuation compensation device in the 20th aspect of the present invention is, according to each of the 1st aspect～19, carry out detection control part action of power supply control for the supervision of carrying out voltage drop in the power system with based on this, with the step-down that connects primary side in the power system with transformer be connected the primary side that this step-down uses and the change-over circuit that is consisted of by rectification circuit and capacitor and consist of continuous-current plant, owing to supply with above-mentioned detection control part from the DC voltage that above-mentioned change-over circuit comes, DC voltage that can control performance is good is supplied with and is detected control section.

And the described voltage fluctuation compensation device in the 21st aspect of the present invention is, according to the 20th aspect, within the actuation time of the voltage drop of compensates electric system, increase condenser capacity, the discharge time constant of setting from this capacitor to the change-over circuit efferent is larger than setting, so that become below the permissible value of regulation from the next output voltage decline of continuous-current plant, thereby can make detection control part operating stably, improve the reliability of voltage fluctuation compensation device.

And the described voltage fluctuation compensation device in the 22nd aspect of the present invention is, according to each of the 1st aspect～19, for the supervision that makes voltage drop in the power system and the detection control part action of carrying out thus power supply control, supply with DC voltage by the dc source that the system beyond the above-mentioned power system consists of to above-mentioned detection control part, thereby can make detection control part operating stably, improve the reliability of voltage fluctuation compensation device.

And the described voltage fluctuation compensation device in the 23rd aspect of the present invention is, according to the 1st aspect or 2, by the full compensating circuit output that is connected in series whole voltage compensating circuits and consists of, possess the bypass switch with this full compensating circuit parallel connection, thus maintenance, when checking by bypass with switch to the supply capability of loading.

And the described voltage fluctuation compensation device in the 24th aspect of the present invention is, according to the 4th aspect or 23, both sides at full compensating circuit, tie point from short switch and bypass usefulness switch, insert change-over switch to this full compensating circuit side, thereby under no-voltage condition, carry out safely maintenance, the inspection of full compensating circuit on one side to the load supply capability on one side.

And the described voltage fluctuation compensation device in the 25th aspect of the present invention is, according to the 4th aspect, circuit two ends at be connected in parallel full compensating circuit and short switch are connected in series change-over switch, and with the outside of this change-over switch of both sides as tie point, possess above-mentioned full compensating circuit and state short switch bypass switch in parallel with catching up with, thereby maintenance, when checking by the bypass switch, on one side under no-voltage condition, carry out safely maintenance, the inspection of full compensating circuit and short switch on one side to the load supply capability.

And the described voltage fluctuation compensation device in the 26th aspect of the present invention is; according to each of the 1st aspect～4; near the upstream side of the voltage fluctuation compensation device that connects in the electric power system in this electric power system; possesses under-voltage relay; detect more than the certain voltage decline of above-mentioned electric power system; and the protecting electrical power system circuit breaker of outfit blocking circuit; in the action that the above-mentioned power system voltage of output voltage compensation that comes with voltage compensating circuit descends; possess and to stop circuit; make the voltage drop detection signal of the circuit open command that becomes above-mentioned under-voltage relay output not be sent to above-mentioned protecting electrical power system circuit breaker; thereby voltage fluctuation compensation device can reliability when system voltage descends carry out the voltage compensation action well, and compensated voltage is supplied with load.

And the described voltage fluctuation compensation device in the 27th aspect of the present invention is; near the upstream side of this voltage fluctuation compensation device in above-mentioned electric power system; possesses under-voltage relay; the certain above voltage that detects above-mentioned electric power system descends; and the protecting electrical power system circuit breaker of outfit blocking circuit; in the output of bucking voltage; possesses the prevention circuit; make the voltage drop detection signal of the circuit open command that becomes above-mentioned under-voltage relay output not be sent to above-mentioned protecting electrical power system circuit breaker; thereby voltage fluctuation compensation device is when system voltage descends; can reliability carry out the voltage compensation action well, and compensated voltage is supplied with load.

Claims (24)

1. voltage fluctuation compensation device, comprise and carry out the power on supervision of drops and of electric power system based on this detection control part of controlling, and the voltage fluctuation of load is supplied with in inhibition, it is characterized in that also comprising: possess the energy storing device of storing different voltages respectively, the direct voltage of this energy storing device storage converted to exchange output, be connected in series to a plurality of voltage compensating circuits in the electric power system, when the voltage of above-mentioned electric power system descends, select the combination that requires among above-mentioned a plurality of voltage compensating circuits, the voltage that compensates above-mentioned electric power system with its output voltage summation descends.

2. voltage fluctuation compensation device according to claim 1 is characterized in that: the absolute value that is stored in the different voltages on the energy storing device in a plurality of voltage compensating circuits respectively is to this voltage compensating circuit output voltage absolute value of minimum roughly 2 ^KTimes, K=0,1,2 ....

3. voltage fluctuation compensation device according to claim 1, it is characterized in that: on each output of or a plurality of above-mentioned voltage compensating circuits of being connected in series, possesses the high speed machine formula short switch that is used for the bypass voltage compensating circuit, the voltage of above-mentioned electric power system just often, connect this whole short switches and make whole above-mentioned voltage compensating circuit bypasses, disconnect this whole short switches when the voltage of above-mentioned electric power system descends, the voltage that is compensated above-mentioned electric power system by the next voltage output of above-mentioned voltage compensating circuit descends.

4. voltage fluctuation compensation device according to claim 1, it is characterized in that: at the output of the full compensating circuit that constitutes by the whole voltage compensating circuits that are connected in series, possesses the high speed machine formula short switch that is used for the bypass voltage compensating circuit with this full compensating circuit parallel connection, the voltage of electric power system is just often connected this short switch and is made above-mentioned voltage compensating circuit bypass, the voltage of above-mentioned electric power system disconnects this short switch when descending, export the voltage decline that compensates above-mentioned electric power system by the voltage that above-mentioned full compensating circuit comes.

5. voltage fluctuation compensation device according to claim 4, it is characterized in that: because of the voltage of electric power system descends the disconnection that causes short switch when beginning, in the closed-loop path that constitutes by full compensating circuit and above-mentioned short switch, along with the predetermined energy storage device in above-mentioned full compensating circuit flows out discharging current, form mandatory current zero for the commercial frequency alternating current that flows through above-mentioned short switch, this alternating current of instantaneous blocking.

6. voltage fluctuation compensation device according to claim 5, it is characterized in that: carry out supervision that voltage in the electric power system descends and possess: when the voltage of above-mentioned electric power system descends, detect the checkout gear of the current polarity that flows through above-mentioned short switch based on this detection control part of powering control; And the voltage compensating circuit of control selection requirement, the energy storing device in this voltage compensating circuit flows through the control device of catching up with the discharging current of stating the mobile opposite current polarity of short switch.

7. according to claim 3 or 4 described voltage fluctuation compensation devices, it is characterized in that: short switch possesses the high speed reversing arrangement, so that descend the disconnection that causes this short switch when beginning at the voltage of electric power system, because supply with and the electric current that flows through the opposite current direction of short switch, the electric current of this short switch is flow through in instantaneous blocking.

8. according to claim 3 or 4 described voltage fluctuation compensation devices, it is characterized in that: short switch is that electromagnetic repulsion power is used for the mechanical switch that the contact opening operation disconnects.

9. voltage fluctuation compensation device according to claim 1, it is characterized in that: each voltage compensating circuit possesses the compensating switch and the change over switch that is parallel-connected to this voltage compensating circuit output that is used for stored voltage on the energy storing device is inserted electric power system, above-mentioned compensating switch and above-mentioned change over switch, the thyristor by reverse parallel connection connection diode constitutes respectively.

10. voltage fluctuation compensation device according to claim 1, it is characterized in that: each voltage compensating circuit possesses 4 full-bridge converter that thyristor constitutes that connected diode by reverse parallel connection respectively, polarity when descending according to power system voltage, by positive and negative the two one of polarity, output energy storing device on stored voltage.

11. voltage fluctuation compensation device according to claim 1, it is characterized in that: each voltage compensating circuit possesses 2 thyristors that reverse parallel connection respectively connects diode to carry out opposite direction and is connected in series, and the change over switch of this voltage compensating circuit output that is connected in parallel, with 2 half bridge converters that thyristor constitutes that are connected diode by reverse parallel connection respectively, polarity when descending, output according to the voltage of electric power system be stored in the output generating positive and negative voltage a pair of energy storing device the two one of voltage.

12. voltage fluctuation compensation device according to claim 1 is characterized in that: energy storing device is with charging transformer and the capacitor of charging with diode charging.

13. voltage fluctuation compensation device according to claim 12 is characterized in that: hindering with inserting the electric current brownout in the closed-loop path with the charging that transformer secondary output coil, charging constitute with diode and capacitor by charging.

14. voltage fluctuation compensation device according to claim 9, it is characterized in that: energy storing device is to use the capacitor of diode charging with transformer with charging with above-mentioned charging, and passes through the above-mentioned capacitor charging of the 2 common secondary coils of above-mentioned charging transformer to a plurality of voltage compensating circuits.

15. voltage fluctuation compensation device according to claim 14, it is characterized in that: the capacitor that possesses whole voltage compensating circuits is connected in parallel with the resistance of the charging voltage correspondence that requires respectively, and the charging transformer secondary output coil that these whole capacitors are charged in the lump, at the positive pole of this charging with the transformer secondary output coil, between the intermediate point of two terminals of negative side and this side of the positive electrode terminal, all the be connected in series capacitor of positive polarity of output voltage, between above-mentioned intermediate point and above-mentioned negative side terminal, all the be connected in series capacitor of negative polarity of output voltage, on the tie point of the capacitor of the capacitor of above-mentioned positive polarity and above-mentioned negative polarity, connect the output that above-mentioned charging uses the intermediate point of transformer secondary output coil, according to the charging voltage of the ratio dividing potential drop of the above-mentioned resistance that is connected in parallel, to above-mentioned each capacitor charging.

16. voltage fluctuation compensation device according to claim 15, it is characterized in that: between the tie point of charging with the capacitor of the capacitor of the intermediate point of transformer secondary output coil and positive polarity and negative polarity, compare with the resistance that is connected in parallel on each capacitor, insert fully little electric current brownout resistance.

17. voltage fluctuation compensation device according to claim 12 is characterized in that: the charging transformer to the capacitor charging is that primary side is connected in the electric power system.

18. voltage fluctuation compensation device according to claim 1, it is characterized in that: in order to carry out supervision that voltage in the electric power system descends and based on detection control part action of this control of powering, with the step-down that connects primary side in the electric power system with transformer be connected primary side that this step-down uses and the change-over circuit of forming by rectification circuit and capacitor and constitute continuous-current plant, the direct voltage from above-mentioned change-over circuit will be supplied with above-mentioned detection control part.

19. voltage fluctuation compensation device according to claim 18, it is characterized in that: in the operate time that the voltage of compensates electric system descends, increase condenser capacity, setting is bigger than setting to the discharge time constant of change-over circuit efferent from this capacitor, makes the output voltage decline that comes from continuous-current plant become below the permissible value of regulation.

20. voltage fluctuation compensation device according to claim 1, it is characterized in that: in order to carry out supervision that voltage in the electric power system descends and based on detection control part action of this control of powering, the DC power supply that the system beyond above-mentioned electric power system constitutes is supplied with direct voltage to above-mentioned detection control part.

21. voltage fluctuation compensation device according to claim 1 is characterized in that: possess the bypass switch in parallel with these whole compensating circuits at the whole compensating circuit outputs that constitute by the whole voltage compensating circuits that are connected in series.

22., it is characterized in that: in the both sides of whole compensating circuits, from using the tie point of switch to insert change over switches to these whole compensating circuit sides with short switch or bypass according to claim 4 or 21 described voltage fluctuation compensation devices.

23. voltage fluctuation compensation device according to claim 4, it is characterized in that: change over switch is connected in series at the circuit two ends of be connected in parallel whole compensating circuits and short switch, and with the outside of this change over switch of both sides as tie point, have and above-mentioned whole compensating circuits and above-mentioned short switch bypass switch in parallel.

24. an electric power system comprises:

Be used for the voltage fluctuation compensation device as claimed in claim 1 that is connected with described electric power system;

Under-voltage relay is located at the upstream side of this electric power system with respect to described voltage fluctuation compensation device;

The protecting electrical power system circuit breaker is used to detect the certain above voltage of above-mentioned electric power system and descends, and just interdicts circuit;

Stop circuit, in the action that the above-mentioned power system voltage of the output voltage compensation that comes with voltage compensating circuit descends, make the voltage drop detection signal that becomes the circuit open command of above-mentioned under-voltage relay output not be sent to above-mentioned protecting electrical power system circuit breaker.

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