CA1181806A - Method and device for continuously controlling the phase angle in electric energy transmission equipment - Google Patents
Method and device for continuously controlling the phase angle in electric energy transmission equipmentInfo
- Publication number
- CA1181806A CA1181806A CA000391303A CA391303A CA1181806A CA 1181806 A CA1181806 A CA 1181806A CA 000391303 A CA000391303 A CA 000391303A CA 391303 A CA391303 A CA 391303A CA 1181806 A CA1181806 A CA 1181806A
- Authority
- CA
- Canada
- Prior art keywords
- transformer
- voltage
- energy transmission
- exciter
- correcting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/24—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using bucking or boosting transformers as final control devices
- G05F1/26—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using bucking or boosting transformers as final control devices combined with discharge tubes or semiconductor devices
- G05F1/30—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using bucking or boosting transformers as final control devices combined with discharge tubes or semiconductor devices semiconductor devices only
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices
- G05F1/16—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices combined with discharge tubes or semiconductor devices
- G05F1/20—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices combined with discharge tubes or semiconductor devices semiconductor devices only
Abstract
ABSTRACT OF THE INVENTION
In electric energy transmission equipment it is often necessary to connect high-tension lines and the like together. In order to avoid negative effects reflecting back into the line network and the generators, the phase angles of the alternating voltages to be connected together must agree.
For this purpose, in practice, capacitive or inductive reactive powers have hitherto been connected into the circuit. Such compensation can be continuously carried out by means of a method and a device for carrying out the method, which considerably increases operational reliability. For this purpose, a correcting voltage (UZ) is inductively added to a high-tension line (HL) via a correcting transformer (ZT). The correcting voltage (UZ) is composed of a voltage (UK) =
constant, originating from an exciter transformer (ET), and of a controlled or regulated voltage (UV) which is continuously adjustable and the phase relationship of which is variable, from a voltage source (1).
In electric energy transmission equipment it is often necessary to connect high-tension lines and the like together. In order to avoid negative effects reflecting back into the line network and the generators, the phase angles of the alternating voltages to be connected together must agree.
For this purpose, in practice, capacitive or inductive reactive powers have hitherto been connected into the circuit. Such compensation can be continuously carried out by means of a method and a device for carrying out the method, which considerably increases operational reliability. For this purpose, a correcting voltage (UZ) is inductively added to a high-tension line (HL) via a correcting transformer (ZT). The correcting voltage (UZ) is composed of a voltage (UK) =
constant, originating from an exciter transformer (ET), and of a controlled or regulated voltage (UV) which is continuously adjustable and the phase relationship of which is variable, from a voltage source (1).
Description
Fk/lu A method and a device for continuously controlling the phase angle in electrlc en rgy transmission ~g~
BACKGROUND OF THE INVENTION
The present invention relates to a method for continuously controlling the phase angle in electric energy transmission equipment and to a device for carrying out this method.
When for example several energy transmission lines are connected together, an effort must be made to match the phase angles of the alternating voltages connected together.
This improves the transmission characteristics of the line and reduces any e~fects reflected back to the generators. This effort is made more difficult because the phase angle of a voltage fed into a transmission line is rotated along this line and by the load at the end of this line if this load is not a pure resistance.
For this reason, so-called shunt transformers are used in interconnected grids for matching the phase angles of the voltage in the various parts of the grid to each other.
The shunt transformer induces in each conductor of the line a quadrature-axis voltage component which is superimposed on the input voltage and the phase angle of which is displaced by 90 with respect to that of the input voltage so than an output voltage is generated the phase angle of which is displaced with respect to that of the input voltage.
In addition, a controllable phase-shifting device having at least two series-connected reactive impedances has been disclosed (German Offenlegungsschrift 2,853,358, published June 4, 1980 and the cognate U.S. Patent No. 4,302,716, granted November 24, 1981). Between the impedances a tap has been provided and in series with this tap at least one electrically controlled current switch which is preferably a bidirectional thyristor. This phase-shifting device makes it ~3~r' , . ~
BACKGROUND OF THE INVENTION
The present invention relates to a method for continuously controlling the phase angle in electric energy transmission equipment and to a device for carrying out this method.
When for example several energy transmission lines are connected together, an effort must be made to match the phase angles of the alternating voltages connected together.
This improves the transmission characteristics of the line and reduces any e~fects reflected back to the generators. This effort is made more difficult because the phase angle of a voltage fed into a transmission line is rotated along this line and by the load at the end of this line if this load is not a pure resistance.
For this reason, so-called shunt transformers are used in interconnected grids for matching the phase angles of the voltage in the various parts of the grid to each other.
The shunt transformer induces in each conductor of the line a quadrature-axis voltage component which is superimposed on the input voltage and the phase angle of which is displaced by 90 with respect to that of the input voltage so than an output voltage is generated the phase angle of which is displaced with respect to that of the input voltage.
In addition, a controllable phase-shifting device having at least two series-connected reactive impedances has been disclosed (German Offenlegungsschrift 2,853,358, published June 4, 1980 and the cognate U.S. Patent No. 4,302,716, granted November 24, 1981). Between the impedances a tap has been provided and in series with this tap at least one electrically controlled current switch which is preferably a bidirectional thyristor. This phase-shifting device makes it ~3~r' , . ~
- 2 ~
possible to ro-tate, in small steps and in both possible directlons, the phase angle of the voltage tapped off. The rotation of the phase angle is generated by the reactive power in the reactive impedances which is why the amount of this rotation determines the required rated power of the impedances.
In this arrangement the rated power reaches about one quarter of the power-handling capacity ror a rotation by 6~. For economic reasons, the phase-shifting device described can, therefore, be used only to a limited extent for energy transmission lines in spite of its technical advantages.
SUMMARY OF THE INVENTION
:
It is the object of the invention to create a method and a device for carrying out the method by means of which the phase angle o~ the secondary voltages can be displaced selectively in one and/or in all directions (longitudinally, diagonally and transversely) over a large range of angles. This displacement is intended to make possible an industrial implementation and is not to be caxried out by means of reactive power.
According to the invention, this object is achieved by the feature that at least one continuously adjustable voltage source providing a correcting voltage having a selected phase angle is inductively added to the input voltage.
This results in a vectorial addition of two voltages, which addition can be separately controlled or regulated for each phase.
The device according to the invention is provided with a continuously adjustable voltage source which is connected via a recti~ier circuit to a correcting-voltage source.
The method according to the invention, or the corresponding device, makes it possible continuously to compensate energy systems even with great variations in reactive power loading.
A self-controlled inverter makes it possible to set, in a simple manner, phase angles which have been selected at will.
A particularly economical arrangement is realized when the rectifier circuit comprises a bridge circuit equipped with anti-parallel-connected thyristors.
In order to attain a reduction in the control design effort it is advantageous to provide the voltage source with an exciter transformer which is connected to the input voltage, and the secondary winding oE which is finely stepped.
A further advantageous construction contemplates stepping the secondary winding of the exciter transformer in accordance with a power series. This permits a further reduction in the control design effort since the range, which is to be continuously controlled or regulated, can be selected to be almost randomly small.
~RIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof.
Such description makes reference to the annexed drawings wherein:
Figure 1 shows the principle of vectorial addition of a correcting voltage to the input voltage in an arbitrary direction.
Figure 2 shows a basic diagram of a circuit arrange-ment for the vectorial addition of a compensation voltage in one phase of a line network.
Figure 3 shows a variant of the circuit arrangement of Figure 2 which is provided with a rectifier bridge circuit;
Figure 4 shows a circuit arrangement for a three-phase system with vectorial addition transversely to the input voltage;
Figure 5 shows another circuit arrangement provided with a secondary winding, stepped in accordance with a power series, of - 3a -an exciter transformer;
Figure 6 shows a circuit arrangement for the switchable selective vectorial addition in the longitudinal, transverse and diagonal directions; and Figure 7 shows an illustrative vector cliagram resulting from the circuit arrangement in Figure 6.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to Figure 1, the input voltage of a high-tension line is designated by U. The phase relationship of this input voltage U shows a phase angle (~ which is leading (capacitive load) or lagging (inductive load) within a certain time interval, depending on varying loads applied to the high-tension line. By inductively adding a corrective voltage U~ with a phase angle ~', a phase rotation by ~ is produced. The resultant output voltage is designated by U'; the current and the voltage have the deslred relationship with respect to one another.
In a circuit arrangement, Figure 2, the high-tension line HL is shown symbolized by means of its input voltage U and its output voltage U'. The voltages U and U', respectively, are measured at the secondar~v side of a correcting transformer ZT. The secondary winding of the correcting transformer ZT carries a correcting voltage UZ which has been ~roduced, on the one hand, by an exciter transformer ET and, on the other hand, by a voltage source 1. The voltage source 1 is formed by a correcting-voltage source 3, a suhsequent rectifier circuit 2 and an electronic power circuit LE. The electronic power circuit is supplied with a measuring/control signal S.
The operation of this circuit arrangement is based on the fact that a correcting voltage UZ is added inductively via the correcting transformer ~T to the input voltage U
resulting in the output voltage U'. In this arrangement, a constant alternating voltage UK, displaced by a fixed phase angle with respect to the voltage U, and a variable alternating voltage UV which is connected in series with the alternating voltage UX is connected into the circuit via the exciter transformer ET. The phase relationship and the amplitude of the alternating voltage UV are varied by the measuring/control signal S. For this purpose a self-controlled inverter is used which consists, in a manner known in itself, of the correcting-voltage source 3, the rectifier circuit 2 and the electronlc power circuit LE.
The advantage o~ such a circuit arrangement consists in the fact that only the instantaneous change ~ in phase angle needs to be controlled or regulated. Reactive powers present over greater time intervals can be compensated at least approximately by the exciter transformer ET with its constant alternating voltage UK.
The circuit arrangement according to Figure 3 is again provided with an exciter transformer ET to the primary side of which an input voltage UXO is applied The output or - 5 ~ r~
excitation voltage Uk at the transormer ET is fed to a bridge circuit equipped with antiparallel-connected thyristors 4-7'.
In this bridge circuit, a correcting current IZ, which has been formed therein and which flows through the primary winding of a correcting transformer ZT, is commutated. The current I of a high-tension line HT having an input voltage U flows through the secondary winding of the correctiny transformer ZT. Due to the inductive addition of the correcting voltage UZ the high-tension line HL adjusts to a vo1tage U' which is compensated in phase and amplitude. The transformer ZT is wound in opposite directions which is also symbolized in the varlous Figures of the drawings by means of dots at the primary and secondary winding.
Each of the thyristors 4-7' is provided with its own extinction circuit, known in itself, and permits continuous adjustment of the correcting voltage UZ for any arbitrary phase angle between the output voltage UK of the transformer ET and the correcting current IZ.
As a variant to this arrangement, also only a single pair of antiparallel-connected thyristors 4,4' can be provided with their own extinction circuit, the remaining thyristors 5-7' being extinguished at the zero transition of the current.
As a further variant, the e~tinction -facilities can be omitted at all the thyristors; current transfer then takes place by mens of natural commutation.
In a three-phase system, Figure 4, a high-tension line HL is provided with phases R, S, T. An exciter transformer ET is delta-connected between these phases so that an addition of the voltage vectors is possible in the transverse direction. The compensated phases are designated by R' S' T' , For this purpose, the phase currents IR, IS, IT
are determined by ammeters 8-10 and the voltages UST and URS by voltmeters connected between the phases. The resulting signals Sl (IR, IS, IT) and S2 (UST, URS) control a previously described electronic power circuit LE
equipped with thyristor bridge circuits. At the input the electronic power circuit for the voltage UER is shown which is connected with a stepped winding of the secondary side of the exciter transformer ET. At the output of the el.ectronic power circuit LE a correcting voltage UZR
and a correcting current IZ appear which here also, as previously described, result in a compensa-ted phase voltage UR' by means of inductive addition in the correcting transformer ZT.
The remaining phases are compensated in -the same manner. The stepping of the winding on the secondary side of -the exci-ter transformer ET allows -the control or regulating range required in the electronic power circuit LE to be reduced by suitably connecting the windings together.
The circuit arrangement according to Figure 5 shows an exciter -transformer ET,the secondary side of which is provided with a vernier winding which is stepped in accordance with a power series (3 ).
The bridge circuits 14-16 are again provided with antiparallel-connected thyristors and are fed by the voltages UKl-UK3. The required control range in the thyristor bridge circuit 13, equipped with extinction cir-cuits and fed by the alternating voltage UV, can be kept very small by means of the appropriate connection - with 25 positive and negative phase relationship depending on the winding direction. This makes i.t possible to have a very cost-effective solution; the correcting voltage UZ
or the correcting current IZ, respectively, can be matched to an optimum degree to the operating conditions of energy 30 transmission facilities.
A circuit arrangement for the selective arbitrary addition of voltages in the longitudinal, diagonal, or transverse direction is shown in Figure 6. In this arrangement the exciter transformer ET is again provided 35 with vernier windings stepped in accordance with a power series. However, these windings are duplicated for each R, S, T phase and, accordingly, allow selective con-necting together in arbitrary vector positions in the subsequent electronic power circuit LE.
The electronic power circuit LE, designated by the sub-groups L = longitudinal, Q = transverse, is designed by means of so-called series- and parallel-triacs, this design being known in itself (German Offenlegungsschrift 2,634,742). The control variables of the phases are designated by x, y, z; continuous regulation is carried out in the aforementioned rnanner.
The vector diagram of Figure 7 illustrates the operation of the circuit arrangement of Figure 6. The vectors and their compensation variables are labeled in accordance with their phase designations and control variables.
The many possible combinations for controlling and regulating the phase angle in electric energy trans mission equipment by means of a circuit arrangement in accordance with Figure 6 must be optimized in accordance with the operating conditions. For this purpose a pro-cess computer is advantageously used.
The method according to the invention and the device for carrying out the method are particularly economical since even in the case where the correcting voltage has an arbitrary phase relationship, in each case only a single correcting transformer is switched into the high-tension line.
List of Desi.gnati.ons .
U = input ~oltage U' = output voltage UKo, UK = constant alternating voltage UV = variable alternating voltage (~, U = variable) UZ = correc-ting voltage HL = high-tensi.on line R, S, T = phases of the HL
ET = exciter transformer ZT = correcting transformer LE = electronic power circuit with self-con-trolled inverter (thyristors) ~, ~' = phase angle IZ = correcting current L = longitudinal component Q = transverse component x, y, z = control variables 1 = voltage source 2 = rectifier circuit
possible to ro-tate, in small steps and in both possible directlons, the phase angle of the voltage tapped off. The rotation of the phase angle is generated by the reactive power in the reactive impedances which is why the amount of this rotation determines the required rated power of the impedances.
In this arrangement the rated power reaches about one quarter of the power-handling capacity ror a rotation by 6~. For economic reasons, the phase-shifting device described can, therefore, be used only to a limited extent for energy transmission lines in spite of its technical advantages.
SUMMARY OF THE INVENTION
:
It is the object of the invention to create a method and a device for carrying out the method by means of which the phase angle o~ the secondary voltages can be displaced selectively in one and/or in all directions (longitudinally, diagonally and transversely) over a large range of angles. This displacement is intended to make possible an industrial implementation and is not to be caxried out by means of reactive power.
According to the invention, this object is achieved by the feature that at least one continuously adjustable voltage source providing a correcting voltage having a selected phase angle is inductively added to the input voltage.
This results in a vectorial addition of two voltages, which addition can be separately controlled or regulated for each phase.
The device according to the invention is provided with a continuously adjustable voltage source which is connected via a recti~ier circuit to a correcting-voltage source.
The method according to the invention, or the corresponding device, makes it possible continuously to compensate energy systems even with great variations in reactive power loading.
A self-controlled inverter makes it possible to set, in a simple manner, phase angles which have been selected at will.
A particularly economical arrangement is realized when the rectifier circuit comprises a bridge circuit equipped with anti-parallel-connected thyristors.
In order to attain a reduction in the control design effort it is advantageous to provide the voltage source with an exciter transformer which is connected to the input voltage, and the secondary winding oE which is finely stepped.
A further advantageous construction contemplates stepping the secondary winding of the exciter transformer in accordance with a power series. This permits a further reduction in the control design effort since the range, which is to be continuously controlled or regulated, can be selected to be almost randomly small.
~RIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof.
Such description makes reference to the annexed drawings wherein:
Figure 1 shows the principle of vectorial addition of a correcting voltage to the input voltage in an arbitrary direction.
Figure 2 shows a basic diagram of a circuit arrange-ment for the vectorial addition of a compensation voltage in one phase of a line network.
Figure 3 shows a variant of the circuit arrangement of Figure 2 which is provided with a rectifier bridge circuit;
Figure 4 shows a circuit arrangement for a three-phase system with vectorial addition transversely to the input voltage;
Figure 5 shows another circuit arrangement provided with a secondary winding, stepped in accordance with a power series, of - 3a -an exciter transformer;
Figure 6 shows a circuit arrangement for the switchable selective vectorial addition in the longitudinal, transverse and diagonal directions; and Figure 7 shows an illustrative vector cliagram resulting from the circuit arrangement in Figure 6.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
According to Figure 1, the input voltage of a high-tension line is designated by U. The phase relationship of this input voltage U shows a phase angle (~ which is leading (capacitive load) or lagging (inductive load) within a certain time interval, depending on varying loads applied to the high-tension line. By inductively adding a corrective voltage U~ with a phase angle ~', a phase rotation by ~ is produced. The resultant output voltage is designated by U'; the current and the voltage have the deslred relationship with respect to one another.
In a circuit arrangement, Figure 2, the high-tension line HL is shown symbolized by means of its input voltage U and its output voltage U'. The voltages U and U', respectively, are measured at the secondar~v side of a correcting transformer ZT. The secondary winding of the correcting transformer ZT carries a correcting voltage UZ which has been ~roduced, on the one hand, by an exciter transformer ET and, on the other hand, by a voltage source 1. The voltage source 1 is formed by a correcting-voltage source 3, a suhsequent rectifier circuit 2 and an electronic power circuit LE. The electronic power circuit is supplied with a measuring/control signal S.
The operation of this circuit arrangement is based on the fact that a correcting voltage UZ is added inductively via the correcting transformer ~T to the input voltage U
resulting in the output voltage U'. In this arrangement, a constant alternating voltage UK, displaced by a fixed phase angle with respect to the voltage U, and a variable alternating voltage UV which is connected in series with the alternating voltage UX is connected into the circuit via the exciter transformer ET. The phase relationship and the amplitude of the alternating voltage UV are varied by the measuring/control signal S. For this purpose a self-controlled inverter is used which consists, in a manner known in itself, of the correcting-voltage source 3, the rectifier circuit 2 and the electronlc power circuit LE.
The advantage o~ such a circuit arrangement consists in the fact that only the instantaneous change ~ in phase angle needs to be controlled or regulated. Reactive powers present over greater time intervals can be compensated at least approximately by the exciter transformer ET with its constant alternating voltage UK.
The circuit arrangement according to Figure 3 is again provided with an exciter transformer ET to the primary side of which an input voltage UXO is applied The output or - 5 ~ r~
excitation voltage Uk at the transormer ET is fed to a bridge circuit equipped with antiparallel-connected thyristors 4-7'.
In this bridge circuit, a correcting current IZ, which has been formed therein and which flows through the primary winding of a correcting transformer ZT, is commutated. The current I of a high-tension line HT having an input voltage U flows through the secondary winding of the correctiny transformer ZT. Due to the inductive addition of the correcting voltage UZ the high-tension line HL adjusts to a vo1tage U' which is compensated in phase and amplitude. The transformer ZT is wound in opposite directions which is also symbolized in the varlous Figures of the drawings by means of dots at the primary and secondary winding.
Each of the thyristors 4-7' is provided with its own extinction circuit, known in itself, and permits continuous adjustment of the correcting voltage UZ for any arbitrary phase angle between the output voltage UK of the transformer ET and the correcting current IZ.
As a variant to this arrangement, also only a single pair of antiparallel-connected thyristors 4,4' can be provided with their own extinction circuit, the remaining thyristors 5-7' being extinguished at the zero transition of the current.
As a further variant, the e~tinction -facilities can be omitted at all the thyristors; current transfer then takes place by mens of natural commutation.
In a three-phase system, Figure 4, a high-tension line HL is provided with phases R, S, T. An exciter transformer ET is delta-connected between these phases so that an addition of the voltage vectors is possible in the transverse direction. The compensated phases are designated by R' S' T' , For this purpose, the phase currents IR, IS, IT
are determined by ammeters 8-10 and the voltages UST and URS by voltmeters connected between the phases. The resulting signals Sl (IR, IS, IT) and S2 (UST, URS) control a previously described electronic power circuit LE
equipped with thyristor bridge circuits. At the input the electronic power circuit for the voltage UER is shown which is connected with a stepped winding of the secondary side of the exciter transformer ET. At the output of the el.ectronic power circuit LE a correcting voltage UZR
and a correcting current IZ appear which here also, as previously described, result in a compensa-ted phase voltage UR' by means of inductive addition in the correcting transformer ZT.
The remaining phases are compensated in -the same manner. The stepping of the winding on the secondary side of -the exci-ter transformer ET allows -the control or regulating range required in the electronic power circuit LE to be reduced by suitably connecting the windings together.
The circuit arrangement according to Figure 5 shows an exciter -transformer ET,the secondary side of which is provided with a vernier winding which is stepped in accordance with a power series (3 ).
The bridge circuits 14-16 are again provided with antiparallel-connected thyristors and are fed by the voltages UKl-UK3. The required control range in the thyristor bridge circuit 13, equipped with extinction cir-cuits and fed by the alternating voltage UV, can be kept very small by means of the appropriate connection - with 25 positive and negative phase relationship depending on the winding direction. This makes i.t possible to have a very cost-effective solution; the correcting voltage UZ
or the correcting current IZ, respectively, can be matched to an optimum degree to the operating conditions of energy 30 transmission facilities.
A circuit arrangement for the selective arbitrary addition of voltages in the longitudinal, diagonal, or transverse direction is shown in Figure 6. In this arrangement the exciter transformer ET is again provided 35 with vernier windings stepped in accordance with a power series. However, these windings are duplicated for each R, S, T phase and, accordingly, allow selective con-necting together in arbitrary vector positions in the subsequent electronic power circuit LE.
The electronic power circuit LE, designated by the sub-groups L = longitudinal, Q = transverse, is designed by means of so-called series- and parallel-triacs, this design being known in itself (German Offenlegungsschrift 2,634,742). The control variables of the phases are designated by x, y, z; continuous regulation is carried out in the aforementioned rnanner.
The vector diagram of Figure 7 illustrates the operation of the circuit arrangement of Figure 6. The vectors and their compensation variables are labeled in accordance with their phase designations and control variables.
The many possible combinations for controlling and regulating the phase angle in electric energy trans mission equipment by means of a circuit arrangement in accordance with Figure 6 must be optimized in accordance with the operating conditions. For this purpose a pro-cess computer is advantageously used.
The method according to the invention and the device for carrying out the method are particularly economical since even in the case where the correcting voltage has an arbitrary phase relationship, in each case only a single correcting transformer is switched into the high-tension line.
List of Desi.gnati.ons .
U = input ~oltage U' = output voltage UKo, UK = constant alternating voltage UV = variable alternating voltage (~, U = variable) UZ = correc-ting voltage HL = high-tensi.on line R, S, T = phases of the HL
ET = exciter transformer ZT = correcting transformer LE = electronic power circuit with self-con-trolled inverter (thyristors) ~, ~' = phase angle IZ = correcting current L = longitudinal component Q = transverse component x, y, z = control variables 1 = voltage source 2 = rectifier circuit
3 = correcting-voltage source
4,4' = thyristors with extincti.on circuit 4-7' = thyristors, antiparallel-connected 8-10 = ammeter 11-12 = voltlneter 13 = thyristor br~dge circuit with extinction circuits 14-16 = thyristor bridge circuits ~ ~ _
Claims (3)
1. A static regulation transformer for an electrical energy transmission system having energy transmission lines, comprising:
an exciter transformer having an input side and an output side;
means for inputting at least one selected voltage of said energy transmission system to said input side of said exciter transformer;
an additional transformer defining a correcting transformer connected in circuit with said exciter transformer;
said additional transformer having a primary winding means and a secondary winding means;
said primary winding means of said additional transformer being connected in series with the output side of said exciter transformer and influenced by said excitation voltage;
said secondary winding means of said additional transformer being connected in series with the energy transmission lines of said energy transmission system, current converter means adjustable with respect to an output voltage thereof and comprising at least one bridge circuit;
said bridge circuit containing antiparallel-connected thyristors;
said bridge circuit having an input side and an output side;
said exciter transformer having a secondary winding;
the input side of said bridge circuit being connected with the secondary winding means of the exciter transformer; and the output side of said bridge circuit being connected with the primary winding of said additional trans-former.
an exciter transformer having an input side and an output side;
means for inputting at least one selected voltage of said energy transmission system to said input side of said exciter transformer;
an additional transformer defining a correcting transformer connected in circuit with said exciter transformer;
said additional transformer having a primary winding means and a secondary winding means;
said primary winding means of said additional transformer being connected in series with the output side of said exciter transformer and influenced by said excitation voltage;
said secondary winding means of said additional transformer being connected in series with the energy transmission lines of said energy transmission system, current converter means adjustable with respect to an output voltage thereof and comprising at least one bridge circuit;
said bridge circuit containing antiparallel-connected thyristors;
said bridge circuit having an input side and an output side;
said exciter transformer having a secondary winding;
the input side of said bridge circuit being connected with the secondary winding means of the exciter transformer; and the output side of said bridge circuit being connected with the primary winding of said additional trans-former.
2. The static regulation transformer as defined in claim 1, wherein:
said exciter transformer possesses at least one primary winding for each phase of the energy transmission system; and each of said primary windings being operatively associated with a number of secondary windings stepped in accordance with a power series.
said exciter transformer possesses at least one primary winding for each phase of the energy transmission system; and each of said primary windings being operatively associated with a number of secondary windings stepped in accordance with a power series.
3. The static regulation transformer as defined in claim 1, wherein:
said static regulation transformer is devoid of any capacitances or inductances for accomplishing the regulation in longitudinal, transverse and diagonal directions.
said static regulation transformer is devoid of any capacitances or inductances for accomplishing the regulation in longitudinal, transverse and diagonal directions.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH893180 | 1980-12-03 | ||
| CH8931/80-4 | 1980-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1181806A true CA1181806A (en) | 1985-01-29 |
Family
ID=4346438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000391303A Expired CA1181806A (en) | 1980-12-03 | 1981-12-01 | Method and device for continuously controlling the phase angle in electric energy transmission equipment |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0053413B1 (en) |
| CA (1) | CA1181806A (en) |
| DE (1) | DE3166863D1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0801833B2 (en) † | 1995-01-05 | 2007-03-07 | Siemens Power Transmission & Distribution, Inc. | Transmission line power flow controller with unequal advancement and retardation of transmission angle |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0152002B1 (en) * | 1984-02-10 | 1988-11-17 | BBC Brown Boveri AG | Phase-shifter |
| DE4135059A1 (en) * | 1991-10-24 | 1993-04-29 | Asea Brown Boveri | Continuous voltage controller with magnetically decoupled single transformers - employs thyristors in controlled inverter between additional windings of main transformer and sections of additional transformer |
| AT409691B (en) | 1997-11-11 | 2002-10-25 | Croce Wolfgang | CIRCUIT TO REDUCE LOSSES IN FORMING, SWITCHING OR CONTROLLING ELECTRICAL PERFORMANCE |
| BRPI0802444A8 (en) * | 2008-07-15 | 2017-02-21 | Siemens Ltda | SYSTEM FOR REGULATION OF LOAD VOLTAGE IN POWER DISTRIBUTION CIRCUITS AND METHOD FOR REGULATION OF LOAD VOLTAGE IN POWER DISTRIBUTION CIRCUITS |
| DE102010015276A1 (en) * | 2010-04-15 | 2011-10-20 | A. Eberle Gmbh & Co. Kg | Control / regulation of the secondary voltage of local power transformers through the use of line-commutated inverters |
| FR3029034B1 (en) * | 2014-11-24 | 2018-08-10 | Thales | DEVICE FOR CONVERTING ELECTRIC ENERGY WITH IMPROVED CHARACTERISTICS |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3444457A (en) * | 1967-03-23 | 1969-05-13 | Westinghouse Electric Corp | Voltage regulator system utilizing a center-tapped inductor |
| FR2155839B1 (en) * | 1971-10-08 | 1975-04-18 | Alsthom Cgee | |
| DE2609697C2 (en) * | 1976-03-05 | 1978-04-13 | Nieke Elektroapparate Kg, 1000 Berlin | Variable transformer with electronic control |
| DE2730010C2 (en) * | 1977-07-02 | 1985-05-30 | Brown, Boveri & Cie Ag, 6800 Mannheim | Circuit arrangement for generating reactive currents that can be changed quickly according to size and curve shape |
| DE2902514C2 (en) * | 1979-01-23 | 1982-12-16 | Siemens AG, 1000 Berlin und 8000 München | Arrangement for keeping the voltage constant in a single or multi-phase network |
-
1981
- 1981-11-10 EP EP19810201254 patent/EP0053413B1/en not_active Expired
- 1981-11-10 DE DE8181201254T patent/DE3166863D1/en not_active Expired
- 1981-12-01 CA CA000391303A patent/CA1181806A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0801833B2 (en) † | 1995-01-05 | 2007-03-07 | Siemens Power Transmission & Distribution, Inc. | Transmission line power flow controller with unequal advancement and retardation of transmission angle |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3166863D1 (en) | 1984-11-29 |
| EP0053413B1 (en) | 1984-10-24 |
| EP0053413A1 (en) | 1982-06-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1312649C (en) | Scheme for rapid adjustment of network impedance | |
| US6737837B1 (en) | Device and a method for control of power flow in a transmission line | |
| CA1253203A (en) | Phase shifter | |
| KR920004319B1 (en) | Method and system for in | |
| US5900723A (en) | Voltage based VAR compensation system | |
| US3992661A (en) | Reactive current compensating apparatus for electric power systems | |
| US4286207A (en) | High-power AC voltage stabilizer | |
| US4028614A (en) | High speed control of reactive power for voltage stabilization in electric power systems | |
| US4013942A (en) | Phase shifter | |
| US3551799A (en) | Mains voltage stabilizing apparatus providing constant reactive current | |
| CA1181806A (en) | Method and device for continuously controlling the phase angle in electric energy transmission equipment | |
| GB2152306A (en) | Static var generator having reduced harmonics | |
| Karady | Concept of a combined short circuit limiter and series compensator (power lines) | |
| CA1100200A (en) | Circuit for compensating harmonic currents in an electric consumer | |
| US2812488A (en) | Voltage regulating transformer system with permanent phase shift | |
| EP0083487B1 (en) | Static var generator | |
| US3424971A (en) | Means for controlling reactive power in an inverter station | |
| US6867570B2 (en) | Circuit arrangement for the static generation of a variable electric output | |
| US3909697A (en) | Arrangement for supplying direct current to a consumer from an alternating current source with interposed transformer and rectifier establishing periodic rapid changes in transformation ratio | |
| US3454866A (en) | Regulating transformer arrangement with tap changing means | |
| US5424626A (en) | Tuned A.C. power systems compensator having variable reflective impedance for linear and non-linear reactive load compensation | |
| WO1990015471A1 (en) | Phase converter | |
| US3530358A (en) | Three-phase regulator systems | |
| US4236108A (en) | Variable phase-shifting transformer network | |
| CA1175479A (en) | Multi-voltage transformer input circuits with primary reactor voltage control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |