KR20050085602A - System for voltage stabilization of power supply lines - Google Patents

Abstract

The invention relates to a voltage stabilization system for power supply lines, comprising a variable inductance, an autotransformer and a system for controlling the variable inductance to automatically compensating for voltage variations of the power supply lines. The system can include a control system that includes a processor unit, a setpoint adjustment unit, a feedback unit and a rectifier circuit.

Description

Voltage stabilization system of power line {SYSTEM FOR VOLTAGE STABILIZATION OF POWER SUPPLY LINES}

This application claims the benefit of USC 119 (e) to U.S. Provisional Patent Application No. 60 / 433,601, filed Dec. 16, 2002, and prioritizes Norwegian Patent Application No. 2002 5990, Dec. 12, 2002. Insist. The entire contents of these two applications are referenced in this application.

The present invention relates to voltage stabilization, and more particularly, to a method and system using a variable inductance to compensate for voltage fluctuations that may occur in a power line.

Undersized lines for power transmission, also called weak lines, have relatively small cross sections and relatively large resistances to load requirements. The loss due to the small lead leads to an overvoltage drop, which results in an inadequate voltage level for the power connected to the line.

A transformer is a static device that supplies a fixed voltage determined by the number of primary and secondary windings, that is, the transformer ratio. Under a fixed transformer ratio, the voltage is too low (ie undervoltage) when the load is high, and the voltage is too high (ie overvoltage) when the load is low. Since loads always follow the very variable requirements of each power consumer, sometimes fixed transformer ratio transformers are not suitable for dynamic loads.

The low voltage level can be compensated by stepping up the voltage in the transformer that is powering the line. In the conventional method, the voltage level is controlled by a load tap converter of a transformer connected to each phase at a position where the voltage reaches an unacceptably low level.

Currently, the problem of weak tracks is often solved by replacing the existing tracks with new ones having large cross-sectional areas and corresponding low resistive losses.

Several methods are currently used to improve tracks. If there is space above the existing pole, a new track may be installed on the other side of the pole in parallel with the weak track. Once the new track is installed, the old track is disconnected and removed from service. This method can improve the power transfer system without special interruption of service. Alternatively, there is a way to install the hardware for fixing the new line to the existing pole, to disconnect the weak line, and to quickly install the new line. According to this method, the interruption of service becomes longer than the previous method. In the third method, which is often used when the previous track is unavailable, a new route is constructed. Such construction includes the installation of new poles and new conductors. In particular, before construction can begin, new routes may need to be approved by local governments and property owners.

In another prior art method of voltage regulation, a mechanically controlled variac (ie, a transformer with variable transformer ratio) is used in conjunction with the transformer. However, mechanically controlled bariacs are no longer used because mechanical components require frequent servicing.

Other methods are currently in use to transfer electrical lines near the user and to connect new transformers to the transferred line that are near the user. This method is also undesirable because of the large range of work required to relocate the electrical lines and the high costs associated with it.

Wanlass U.S. Patent No. 3,409,822 (hereinafter referred to as "The Wanus Patent") is a voltage regulator having a device with AC, i.e., a DC wound around a load winding and a ferromagnetic core, i.e. a control winding. It is starting. In part of the iron core, the DC-generating magnetic flux component and the AC-generating magnetic flux component follow the same path but are always provided in opposite directions. As a result, the magnetic flux component is subtracted from this part and the iron core has a permeability corresponding to the final magnetic flux to a limited extent. In other parts, but not all of the iron core, the magnetic flux is orthogonal to each other. For example, the Wanrus patent discloses a voltage regulator based on magnetic flux control at iron core angles through the addition or subtraction of magnetic fluxes (matched magnetic fluxes) that lie in the same path. However, the device's power regulation capability is limited because the regulator disclosed in the Wanrus patent is a means for operation in the unsaturated region of the iron core and the permeability range is limited to the linear region of the iron core.

The above and other objects, features and advantages of the present invention will be more fully understood from the following description taken in conjunction with the accompanying drawings:

1 shows a single winding transformer.

2 shows a first embodiment of the present invention.

3 shows a second embodiment of the present invention.

4 shows a third embodiment of the present invention.

5 shows a general block diagram of an embodiment according to the present invention.

6 illustrates the embodiment of FIG. 2 in more detail.

FIG. 7 shows a control system for controlling the embodiment shown in FIGS. 6 and 8.

8 illustrates the embodiment of FIG. 4 in more detail.

9 illustrates the embodiment of FIG. 3 in more detail.

10 shows a control system for the control of the embodiment of FIG. 9.

11 shows one three-phase embodiment of the present invention.

12 shows a control system for the control of the embodiment of FIG. 1.

Figure 13 shows a second three-phase embodiment of the present invention.

14 shows a control system for the control of the embodiment of FIG. 13.

Figure 15 shows a third three-phase embodiment of the present invention.

16-18 illustrate a control system for the control of the embodiment of FIG. 15.

19 and 20 illustrate controllable inductances in accordance with one embodiment of the present invention.

The present invention addresses the problems associated with prior art solutions to the problems caused by weak tracks. Unlike conventional methods, permeability control is performed using orthogonal fields, but not by parallel magnetic fields that are added or subtracted.

In one aspect of the invention, the invention is a system for voltage stabilization of a power line having a single winding transformer having a series winding and a parallel winding, a variable inductance and a control system connected to the single winding transformer. . The variable inductance includes a magnetic iron core, a main winding wound around a first axis, and a control winding wound around a second axis perpendicular to the first axis. When the main and control windings of the variable inductance are excited, an orthogonal magnetic flux is generated in the magnetic core. The voltage stabilization system of the present invention automatically compensates for the voltage variation of the power supply line to which the system is connected. In one embodiment, orthogonal magnetic flux is generated substantially in all of the magnetic cores, and in another embodiment, the magnetic iron cores are made of an anisotropic magnetic material.

In the embodiment of the voltage stabilization system described above, the control system includes a processor portion for controlling the control current supplied to the control winding, a set point adjustment device and a switch in electrical communication with the processor portion. The switch intercepts the adjustment and is also in electrical communication with the processor unit. The system also includes a feedback input for sensing the output voltage, which is in electrical communication with the processor portion and the power line. The control system also includes a rectifying circuit in electrical communication with the processor portion and the control winding.

In one variation of the above embodiment, the series winding of the single winding transformer is connected in series with the first power supply line, and the parallel winding is connected in series with the main winding and the second power supply line.

In another variation of this embodiment, the series winding and the main winding are connected in series with the first power supply line, the main winding is located on the line side of the series winding, and the parallel winding is directly connected to the second power supply line.

In another aspect, the invention includes a method for voltage stabilization. An input voltage is supplied to the single winding transformer, the controllable inductance is connected in series to at least one winding of the single winding transformer, and the output is sensed. Orthogonal magnetic fields are generated in the magnetic core of the controllable inductance. At least one orthogonal magnetic field is adjusted to control the magnetic permeability of the magnetic core to adjust the voltage in response to the sensed output voltage.

In the system according to one embodiment of the invention, substantially no transformer action occurs between the main winding and the control winding, since the two magnetic fields are orthogonal at all parts of the iron core. This extended operation improves the power regulation capability of the variable inductance by the order of magnitude, because the power regulation capability is proportional to the inverse of the magnetic permeability of the magnetic material (half the permeability, the power regulation is doubled). . Therefore, the present invention can be used in the high power field.

In addition, a dynamic voltage amplifier or voltage stabilization system that employs orthogonal flux control to adjust the line voltage to maintain the voltage at a predetermined value while increasing the line voltage necessary to avoid undervoltage conditions is very useful for improving the line. It is an efficient alternative. Such a device can be connected to a weak line, dynamically compensating for the load dependent voltage drop.

The system according to the invention comprises an electronically controlled quadrature flux inductance. Together with the transformer, this inductance provides a variable output voltage that compensates for undesirable voltage drops.

In one embodiment, the power supply line voltage stabilization system comprises a control system for controlling the current in the control winding as a function of the desired and practical operating parameters of the power supply line. In one variant, the operating parameter is line voltage. The regulation system supplies power to the control windings within the variable inductance based on the line equipment and the line voltage (i.e., set point) of a predetermined value, as a result of which the output voltage is maintained at a predetermined value.

By the embodiments of the present invention, the existing weak line can be applied to maintain a suitable voltage in a simple and inexpensive manner when energy use is increased. In one embodiment, the proper voltage is maintained by connecting a voltage stabilization system to the line between the distribution transformer and the user. In one variation of this embodiment, the single winding transformer adds a voltage in series with the power supply voltage to stabilize the line voltage. The variable inductance adjusts the voltage across the series winding of a single winding transformer by adjusting the voltage across it (by changing the permeability of the inductance core by orthogonal magnetic fields) or the time voltage integral across it.

This voltage stabilization must be done quickly to prevent damage to the equipment on the user's side, as this kind of damage occurs when a rapid change in load causes excessive overvoltage. In a system according to one embodiment of the invention, the change in voltage is controlled by the control of the current in the control winding. The low inertia and responsiveness of the system allows the system to absorb voltage peaks and troughs.

The single winding transformer is a transformer having a series winding S and a parallel winding P. FIG. 1 shows a single winding transformer T1 in which a parallel winding P and a series winding S are connected in series. The series winding S has a relatively small number of turns, while the parallel winding P has a relatively large number of turns. In one embodiment, the series winding has about 20 turns, and the parallel winding has about 230 turns. The applied voltage V1 is divided in proportion to the number of turns of the series winding S and the parallel winding P. When the total number of windings included in the parallel winding P and the series winding S is N1 and the number of windings of the parallel winding P is N2, the voltage V2 having the value of V1 (N2 / N1) is the parallel winding P. Appear across. Since the device is also reversible, the magnetic flux connecting both the parallel winding P and the series winding S is set when the voltage V2 is applied across the parallel winding P. As a result, a potential difference of V1 = V2 (N1 / N2) appears at both ends of the N1 winding (male).

In the first embodiment of the present invention shown in FIG. 2, the series winding S is a first power line (for example, a first phase) from the line input LI to the line output LU. It is connected in series with. In this embodiment, the parallel winding P is connected to the second power supply line (for example, the second phase) L via the orthogonal magnetic field variable inductance LR. Here, the voltage in the series winding S can be changed by changing the voltage in the parallel winding P by the variable inductance LR.

In the second embodiment of the present invention shown in Fig. 3, the variable inductance LR and the series winding S are connected in series with the first power line from LI to LU, in which case the variable inductance is connected to the series winding S. It is connected to the track side (LI) of. The parallel winding P is connected to the second power supply line.

In the third embodiment of the present invention shown in Fig. 4, the variable inductance LR and the series winding S are connected in series with the first power line from LI to LU, in which case the variable inductance is connected to the series winding S. Is connected to the load side (LU). The parallel winding is directly connected to the second power supply line L, and in the preceding embodiments, the second phase is a neutral conductor.

In the second and third embodiments of the present invention, the first power line LI-LU because the variable inductance LR absorbs the temporal voltage sum keeping in series with the voltage from the series winding S of the single winding transformer. The voltage in) changes.

Since the voltage absorbed by the variable inductance is the reactance voltage, this voltage is 90 ° ahead of the current. As a result, the voltage subtracted from or added to the load voltage has a phase difference of 90 ° from the resistive current caused by the load. In a single winding transformer, an ampere-turn balance occurs between the series winding S and the parallel winding P. Therefore, the voltage induced by the load is reflected in the parallel winding P, causing a voltage drop in the variable inductance. The magnitude of the voltage drop depends on the value of the variable inductance and the amount of current.

In one embodiment, a fixed inductor is installed in parallel with the parallel winding of the single winding transformer to reduce the high frequencies generated by the system to stabilize control of the system. In addition, variable inductance may be used.

In the second embodiment, the current through the variable inductance is the sum of the load current through the series winding and the current through the parallel winding, and in the third embodiment, the current through the variable inductance is the load current. to be. In the first embodiment, the current through the variable inductance is the current in the parallel winding. Since these currents have different magnitudes, the embodiment may be selected depending on the particular application.

5 is a block diagram illustrating a voltage stabilization circuit and associated control system (eg, regulation system). The first power supply line LI passes through a voltage stabilization circuit controlled by the control system. K1, K2 and K3 are switches that connect or disconnect the voltage stabilization circuit to the network. In Fig. 5, K1 is shown in a closed state and K2 and K3 are shown in an open state, which corresponds to a state in which no voltage stabilization circuit is used. When using the voltage stabilization circuit, K1 and K2 are open and K3 is closed.

6 and 7 show the single phase voltage stabilization circuit in more detail. T1 is a single winding transformer having a series winding (S) located between terminals 1-2 and 3 and a parallel winding (P) located between terminals 1-2 and 4, which is shown in FIG. Corresponds to one embodiment.

In FIG. 6, T4 is an orthogonal magnetic field variable inductance LR with an operating winding located between terminals 1 and 2, ie a main winding H and a control winding ST located between terminals 3 and 4. FIG. Controllable inductance LR is connected to parallel winding P of transformer T1 with terminal 2 of T4 connected to the terminal of T1. The terminals 1L1 and 1L2 supply a voltage to the rectifier circuit U9 shown in FIG.

7 shows a control system for adjusting the current in the variable inductance T4. The control system is connected to a setpoint regulator, a switch S3 for regulating regulation, a feedback circuit for sensing the output voltage of the single winding transformer T1, a processor unit U8 and a control winding of the inductance. Rectifier circuit U9. In one embodiment, the set point adjustment device is potentiometer R8 and the feedback circuit comprises a transformer T7. In another embodiment, the processor unit U8 includes a microprocessor, and in another embodiment, the system also includes an overvoltage protection circuit U10.

More specifically, in one embodiment, the set point adjusting device of FIG. 7 includes a first terminal, a second terminal and a third terminal connected to terminals 7, 11 and 10 of the processor unit U8, respectively. The switch S3 includes a first terminal and a second terminal connected to terminals 4 and 6 of the processor unit U8, respectively. Primary terminals 1,2 of transformer T7 are connected to S1 and R1 to sense the output voltage appearing on the LU. In a variant of this embodiment, the primary winding of transformer T7 is protected by a fuse. The first terminal and the second terminal of the secondary winding of the transformer T7 are connected to terminals 5 and 9 of the processor unit U8, respectively.

In one embodiment, the terminals 1L1 and 1L2 corresponding to R1 and S1 are connected to the input line of the processor unit U8. In a variant of this embodiment, a shielding transformer is used to reduce this voltage before the voltages appearing at 1L1 and 1L2 are applied to the processor unit U8. The overvoltage protection device U10 includes a 1L1, a rectifier constant output terminal and a first terminal, a second terminal and a third terminal respectively connected to 1L2. In a variant of this embodiment, the overvoltage protection circuit includes a first potentiometer R1 connected between the first terminal and the second terminal, and a second potentiometer R2 connected between the second terminal and the third terminal. do. The overvoltage protection circuit also includes fixed resistors R3 and R4.

In one embodiment, terminals L1 and L2 of FIG. 6 are also connected to the first terminal and the second terminal of rectifier circuit U9. The rectifier circuit U9 output includes a positive electrode terminal and a negative electrode terminal respectively connected to the control winding ST at terminals 3T4 and 4T4. In a variation of this embodiment, a resistance network comprising one or more resistors (ie, R5, R6 and R7) is connected in series with the negative electrode terminal and the control winding ST.

In one embodiment, the rectifier circuit U9 is a full-wave bridge circuit comprising four diodes V1, V2, V3 and V4. In a variation of this embodiment, diodes V1 and V2 are control rectifying diodes, ie thyristors. The rectifier circuit U9 is connected to the processor unit U8 through a control terminal for the diode V1 and a control terminal for the diode V2. In still another modification of this embodiment, the diode V5 is connected between the positive electrode terminal and the negative electrode terminal of the rectifier circuit U9.

In general, the control system of FIG. 7 occurs across the main winding H of the controllable inductor T4 by adjusting the power supplied to the control winding ST in response to a change in the output voltage of the single winding transformer T1. Automatically adjust the voltage drop. The set point representing the predetermined output voltage is set via the set point adjusting device R8. The feedback circuit provides an indication of the output voltage of the single winding transformer T1 to the processor unit U8. The processor unit U8 adjusts the power supplied to the rectifier output terminal by controlling the operation of the rectifier circuit U9 by comparing the set point and the feedback voltage. In one embodiment, the output of rectifier circuit U9 is a DC current.

The first embodiment of the present invention shown in 6, whose inductance LR is connected in series with the parallel winding P of the single winding transformer T1, is realized by the voltage across the parallel winding of T1. The voltage is regulated by an inductance T4 connected in series by a transformer with a line voltage LI-LU between input terminal X1 and output terminal X1: 7. Thus, the voltage supplied to the load from R and S on X1: 7 and X1: 10 increases. If the difference between the feedback signal and the set point is large, the regulator increases the additional voltage to compensate for the voltage drop by increasing the control current for inductance T4. Conversely, if the added voltage is too high, the power is reduced by adjusting the voltage added to the line voltage down. Therefore, the output voltage supplied to the load is maintained at about the same level as the setpoint voltage.

FIG. 8 illustrates in more detail a third embodiment of the present invention initially outlined with reference to FIG. 4. In FIG. 8, T1 is a single winding transformer having a series winding S located between terminals 1-2 and 3 and a parallel winding P located between terminals 1-2 and 4. FIG. The control system associated with this circuit is shown in FIG.

T4 is an orthogonal magnetic field variable inductance with a main winding (H) located between terminals 1 and 2 and a control winding (ST) located between terminals 3 and 4. The terminal 1 of the inductance T4 is connected to the output terminal of the series winding S at the terminal T3 and is also the terminal 3 of the control winding ST of FIG. 8 from the positive and negative terminals of the control rectifying circuit U9 of FIG. 7. Control currents are supplied to and 4. Output voltages from terminals R and S of the voltage stabilization circuit of FIG. 8 are feedback-connected to terminals 2 and 1 of the transformer T of FIG. By this connection, a feedback signal is supplied to the rectifier regulator U8 of FIG. In one embodiment, the set point adjustment may be made via potentiometer R8. The voltage input to the rectifier U9 of FIG. 8 is supplied from terminals X1: 2 and X1: 4 of FIG.

In a voltage system in which the inductance LR is connected to the load side of the series winding S of the single winding transformer T1 and in series with the output of the winding, a controllable induced voltage drop across the inductance T4 installed in series on the line is provided. Stabilization is achieved by adjusting the incremental output voltage (output line voltage) from T1.

If the difference between the feedback signal and the set point is large (e.g., a large low voltage), the regulator increases the control current for inductance T4, thereby reducing the voltage drop across the inductance, thereby increasing the voltage and compensating for the voltage drop. Conversely, if the additional voltage is too large (e.g., overvoltage), the power supplied to inductance T4 is reduced. As a result, the voltage drop across the inductance T4 is reduced, the voltage supplied to the load is reduced, and the output voltage is maintained at the set point voltage.

9 illustrates in more detail a second embodiment of the present invention. Here, T1 is a single winding transformer with a series winding located between terminals 1-2 and 3. The parallel winding P is located between terminals 1-2 and 4. This embodiment corresponds to the embodiment shown schematically in FIG. 3, and the corresponding control system is shown in FIG. 10.

T4 is a variable inductance with a main winding (H) located between terminals 1 and 2 and a control winding (ST) located between terminals 3 and 4. Terminals T4: 2 of the controllable inductance are connected to the series winding S at terminals T1: 1-2. The parallel winding P is also connected to the terminals T1: 2. FIG. 10 shows how the control current is supplied from the positive and negative electrodes of the control rectifier circuit U9 to terminals 3 and 4 on the control winding ST of FIG. 9. Output voltages from terminals R and S of the voltage stabilization circuit are feedback-connected to terminals 2 and 1 of the transformer T7. By this connection, a feedback signal is supplied to the rectifier regulator U8. In one embodiment, the set point adjustment may be made via potentiometer R8. The voltage input to the rectifier U9 is supplied from terminals X1: 2 and X1: 4 of FIG.

The voltage regulator connection comprises an inductance LR connected to the line side of the series winding S while in series with the winding. In this embodiment, stabilization is realized through the adjustment of the single winding transformer through the adjustment of the voltage drop across the inductance T4 installed in series on the line.

If the value of the set point far exceeds the value of the feedback signal (ie, low voltage), the regulator compensates for the voltage drop by reducing the voltage drop across the inductance by increasing the control current for the inductance T4.

Conversely, when an overvoltage condition occurs, the power supplied to the control winding is reduced to increase the voltage drop across the inductance, keeping the output voltage supplied to the load approximately equal to the setpoint voltage.

Thus, for the single phase solution described so far, the three phase embodiment is based on the same technical voltage regulation method based on the comparison between the output voltage and the reference voltage (ie, the set point).

11 and 12 show a three-phase embodiment of the solution according to the second embodiment of the present invention shown in FIG. In Fig. 11, the control windings ST of the inductances T4, T5 and T6 are shown to be connected in series so that they are equally adjusted via the control circuit of Fig. 12. 12 shows an adjustment system corresponding to the above-described adjustment system. The regulation system comprises a set point regulating resistor (R8), a switch (S3) that intercepts the regulator, a transformer (T7) for voltage feedback from the phase RS, a processor unit (U8) (i.e., a reactor regulator), a diode rectifier (U9). And an overvoltage protection circuit U10.

The current signal is supplied to the variable reactance T4 from the output of the regulation system (points 3T4 and 4T4). In a variant of this embodiment, individual adjustments to each phase are also possible.

13 and 14 show a three phase embodiment of the single phase solution of FIG. 8 wherein the control windings of inductances T4, T5 and T6 (FIG. 13) are connected in series and are equally adjusted. In a variant of this embodiment, individual adjustments to each phase are also possible. 14 shows a corresponding control circuit used to adjust the voltage supplied to the load.

15 to 18 show a three phase embodiment of the single phase solution of FIG. Inductances T4, T5 and T6 are shown in FIG. Each of these inductances T4, T5, and T6 is adjusted by respective adjustment circuits. In this three-phase embodiment, the phase sequence is important because the voltage in the series winding S is added to the phase voltage vectorly from the supply transformer to the line (not shown). A series winding is located between points 1 and 3, while a parallel winding is located between points 2 and 4. A single winding transformer for each phase T1, T2 and T3 is also shown in FIG. 15. The variable inductance T4 adjusts the voltage for T1 in response to the feedback signal supplied from phases R-S (X1: 7 and X1: 10). The variable inductance T5 adjusts the voltage for T2 in response to the feedback signal supplied from phases S-T (X1: 12 and X1: 14). The variable inductance T6 adjusts the voltage for T3 in response to the feedback signal supplied from phases T-R (X1: 14 and X1: 10). In this way the line voltages for each phase can be adjusted independently of each other.

FIG. 16 shows the voltage adjustment of T1 using T4 performed in response to the predetermined voltage indicated by the set point set by the set point adjusting device R8. The output signal (see lower right in FIG. 16) is applied to points 3 and 4 of T4. Corresponding adjustment of T2 using T5 performed in response to the set point adjustment device R10 is shown in FIG. The voltage regulation at T3 using T6 is shown in FIG. 18.

The three phase system described above shows a delta connection of the parallel windings. However, other connections may also be used. For example, the parallel windings can be connected in a molded (ie, Y-shaped circuit) configuration, which is a known connection structure for three-phase systems.

19 shows an embodiment of a controllable inductor T4, which comprises a first pipe element 101 and a main winding H wound around the first pipe element 101. . In one embodiment, the controllable inductor also includes magnetic termination couplers 105, 106. In one embodiment, controllable inductor T4 is made of anisotropic material. In a variant of this embodiment, the anisotropic material is a grain oriented anisotropic material. If a directional material is used, the directional direction GO and the horizontal direction TD can be defined.

As shown in FIG. 20, the controllable inductor T4 also has a second pipe element 102. The control winding ST is wound around the second pipe element and the second axis perpendicular to the first axis on which the main winding H is wound. In a variant of this embodiment, the second pipe element 102 is located concentrically in the first pipe element 101. The end couplers 105 and 106 connect the ends of the first pipe element 101 to the corresponding ends of the second pipe element 102 respectively. In a variant of this embodiment, the magnetic iron core is formed by the first pipe element 101, the second pipe element 102 and the termination couplers 105, 106.

In the embodiment shown in FIG. 20, the first axis M is an annular axis relative to the second axis L. As shown in FIG. In this embodiment, the second axis L is a linear axis located at the center of the second pipe element 102.

In operation, the controllable inductor T4 of FIGS. 19 and 20 generates two orthogonal magnetic fluxes. The first magnetic field H _f and the first magnetic flux B _f are generated when the main winding H is excited. First magnetic field H _s of the first magnetic flux Bs are generated when the control winding (ST) women. In a variant of this embodiment, the magnetic fields H _f and H _s are orthogonal to each other in virtually all magnetic cores, and the magnetic fluxes B _f and B _s are orthogonal to each other in virtually all magnetic cores.

Modifications, modifications, and other implementations to those described herein can be made by those skilled in the art without departing from the spirit and scope of the invention as claimed. Accordingly, the present invention should not be defined by the preceding exemplary description, but should instead be defined by the spirit and scope of the claims set forth below.

Claims (14)

A system for voltage stabilization of power lines, Single winding transformer including series winding and parallel winding; A variable inductance connected to the single winding transformer and having a magnetic iron core, a main winding wound around the first axis, and a control winding wound around the second axis; And And a control system for controlling the magnetic permeability of the magnetic iron core. The voltage fluctuation of the power line is automatically compensated, The first axis and the second axis are orthogonal axes, and Orthogonal magnetic flux is generated in the magnetic iron core when the main winding and the control winding are excited. The method of claim 1, wherein the control system, A processor unit; An adjusting device in electrical communication with the processor unit; A switch in electrical communication with the processor unit; A feedback input in electrical communication with the processor unit and the power line; And A rectifying circuit in electrical communication with said processor portion and said control winding, The switch operates to intervene adjustment, The feedback input senses an output voltage, and also And the processor unit controls a control current supplied to the control winding.  The series winding of the single winding transformer is connected in series with a first power supply line. The parallel winding is connected in series with the main winding and the second power supply line. The method of claim 1, wherein the series winding and the main winding is connected in series with a first power supply line, The main winding is located on a line side of the series winding, And said parallel winding is directly connected to a second power supply line. The method of claim 1, wherein the series winding and the main winding is connected in series with the first power line, The main winding is located on a load side of the series winding, And said parallel winding is directly connected to a second power supply line. A three-phase system for voltage stabilization of a power supply line, comprising a system according to any one of claims 2, 3 or 4 for voltage stabilization of each phase. 6. The three-phase system for voltage stabilization of a power supply line according to claim 5, wherein the three-phase control windings are connected in series and adjusted together. 6. The three-phase system for voltage stabilization of a power supply line according to claim 5, wherein the three-phase control windings are controlled independently of each other. 2. The voltage stabilization system of a power supply line according to claim 1, wherein said magnetic iron core comprises an anisotropic material. 2. The voltage stabilization system of a power supply line according to claim 1, wherein said orthogonal magnetic flux is generated in substantially all magnetic cores. Supplying an input voltage to the mono winding transformer; Connecting a controllable inductance in series with at least one winding of the single winding transformer; Sensing an output voltage; Generating orthogonal magnetic fields at the magnetic core of the controllable inductance; And Adjusting at least one magnetic field of the orthogonal magnetic field to control the magnetic permeability of the magnetic iron core to adjust the voltage in response to the sensed output voltage. 12. The method of claim 11 wherein the controllable inductance is connected in series with a series winding of the first phase of the circuit. 13. The method of claim 12 wherein the controllable inductance is connected to the load side of the series winding. 12. The method of claim 11, wherein controlling the permeability comprises adjusting a control current supplied to a control winding of the controllable inductance.