CN104485824A - Multifunctional transformer with isolated magnetic control - Google Patents
Multifunctional transformer with isolated magnetic control Download PDFInfo
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- CN104485824A CN104485824A CN201510010431.0A CN201510010431A CN104485824A CN 104485824 A CN104485824 A CN 104485824A CN 201510010431 A CN201510010431 A CN 201510010431A CN 104485824 A CN104485824 A CN 104485824A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 69
- 230000009466 transformation Effects 0.000 claims abstract description 11
- 230000004907 flux Effects 0.000 claims description 19
- 238000004804 winding Methods 0.000 claims 14
- 238000000034 method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
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- 208000012826 adjustment disease Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F21/00—Variable inductances or transformers of the signal type
- H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
- H01F21/08—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by varying the permeability of the core, e.g. by varying magnetic bias
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
- Control Of Electrical Variables (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The invention relates to a multifunctional transformer with isolated magnetic control. The multifunctional transformer comprises a magnetic control saturable reactor, and a primary coil and a secondary coil are arranged on an iron core of the magnetic control saturable reactor. The ratio of transformation of the primary coil and the secondary coil is equal to that of the transformer. Various AC coils and DC coils of the magnetic control saturable reactor are neither connected with the primary coil and the secondary coil nor connected with an electrical power system. The magnetic control saturable reactor is provided with the DC coils which are connected with a thyristor D1 and a thyristor D2 in series respectively. A control circuit controls the magnitudes of fire angles of the thyristor D1 and the thyristor D2, and therefore the reactance value of the primary coil is continuously adjusted.
Description
Technical Field
The invention relates to the technical field of power transmission and transformation of a power system, in particular to a multifunctional transformer with isolated magnetic control.
Background
Power transformers are used in a wide variety of applications in power systems. The power transformer can convert a high voltage into a low voltage and can also convert a low voltage into a high voltage.
Shunt reactors are also widely used in power systems. The shunt reactor can limit overvoltage; the reactor and the capacitor are combined to form a reactive power regulating circuit of the power system. In some application fields, the reactance value of the shunt reactor is fixed and invariable; in some application fields, the reactance value of the reactor is continuously adjusted along with the change of the operation mode of the power system. The controllable saturable reactor with the reactance value capable of being continuously adjusted is called a saturable reactor or a magnetically controlled reactor for short.
Hitherto, two devices, namely a power transformer and a magnetically controlled saturable reactor, have been studied and manufactured separately. Both types of equipment have larger iron cores respectively and require coils with more turns. If a transformer substation needs a power transformer, a magnetically controlled saturable reactor and two devices at the same time, the total volume of the devices is large, the iron core is heavy, the price is high, and the occupied area is large.
CN201410461882.1 proposes a multifunctional transformer, realizes the transformer function and the magnetically controlled saturable reactor function on the basis of a magnetically controlled saturable reactor iron core. However, the change of the load of the transformer of the invention can affect the reactance value of the magnetically controlled saturable reactor. The method is not suitable for occasions where the load of the transformer is changed greatly and the reactance value of the magnetic control saturable reactor is required to be unchanged.
Disclosure of Invention
The invention aims to solve the problems and provides a multifunctional transformer with isolated magnetic control, wherein the load of the transformer is changed, and the reactance value of a magnetic control saturable reactor is not influenced.
In order to achieve the purpose, the invention adopts the following method:
a kind of magnetic control isolated multi-functional transformer, it is single-phase, including magnetic control saturation reactor and transformer installed on the same closed-loop iron core; wherein,
the transformer consists of a primary coil and a secondary coil, and the transformation ratio of the primary coil to the secondary coil is equal to the transformation ratio of the transformer;
the magnetically controlled saturable reactor comprises alternating current coils, direct current coils and a control circuit, and the coils are not directly connected with the primary coil and the secondary coil of the transformer and are not connected to a power system;
the control circuit adjusts the direct current of the magnetically controlled saturable reactor, and the reactance value of the primary coil is continuously adjusted.
The primary coil and the secondary coil of the transformer are respectively composed of a pair of alternating current coils which are arranged on two iron core columns and are connected in series in the forward direction;
the magnetically controlled saturable reactor comprises two groups of coils positioned on two iron core columns, and the two groups of coils have the same structure; each group of coils comprises a first alternating current coil, a second alternating current coil and a direct current coil; the homonymous ends of the two first direct current coils and the homonymous ends of the two direct current coils are connected together;
the synonym ends of the two direct current coils are connected with a contact N through a forward thyristor and a reverse thyristor;
the different name end of the first alternating current coil on each iron core column is connected with the same name end of the second alternating current coil on the other iron core column; the synonyms of the two second coils are connected with a connection point N;
the control ends of the two thyristors are connected with the control circuit, the control circuit controls the triggering angles of the two thyristors, the rectification quantity of the two thyristors is continuously adjusted, and the direct current of the two direct current coils is adjusted.
The number of turns of the two alternating current coils of the primary coil is equal; the two alternating current coils of the secondary coil have equal turns; the turn ratio of each alternating current coil of the primary coil to each alternating current coil of the secondary coil is equal to the transformation ratio of the primary coil and the secondary coil of the transformer.
A fly-wheel diode is connected in series between a first alternating current coil and a second alternating current coil which are positioned on the same iron core column in the magnetically controlled saturable reactor.
The turns of all alternating current coils in the magnetically controlled saturable reactor are equal; the number of turns of each direct current coil is equal; the number of turns of each direct current coil is not equal to twice of the number of turns of the first alternating current coil on the iron core column where the direct current coil is located, so that voltage exists at two ends of the two thyristors.
The primary coil of the transformer consists of two pairs of alternating current coils which are connected in series in the positive direction, and the two alternating current coils of each pair of alternating current coils are respectively positioned on different iron core columns; the homonymous ends of two alternating current coils at the same position in the two pairs of alternating current coils are connected, and the heteronymous ends of the rest two alternating current coils are connected; the secondary coil is formed by a pair of forward series AC coils positioned on the two iron core columns;
the magnetic control saturation electric controller consists of two groups of direct current coils which are respectively positioned on different iron core columns; the two direct current coils at the same position on the two iron core columns in each group of direct current coils are connected at the same name end; in the rest synonym terminals, one of the two synonym terminals of the direct current coil of the same group is directly connected with the connection point N, and the other is connected with the connection point N through a forward or reverse thyristor, but the positions of the direct current coils connected with the thyristors are not corresponding to the positions of the iron core columns; each thyristor is connected with the control circuit; the control circuit controls the triggering angles of the two thyristors, so that the rectification quantity of the two thyristors is continuously adjusted, and the direct current of the two direct current coils is adjusted.
The number of turns of each alternating current coil of the primary coil is equal; the turns of the alternating current coils of the secondary coil are equal;
the number of turns of each alternating current coil of the primary coil and the number of turns of each alternating current coil of the secondary coil are equal to 2 times of the transformation ratio of the primary coil and the secondary coil of the transformer.
And a freewheeling diode is connected between two alternating current coils on the same iron core column in the primary coil in series.
When the control circuit controls the two thyristors to be completely cut off, the rectifying circuits of the two thyristors do not work, the direct current of each direct current coil is equal to zero, and the primary coil of the transformer has a maximum reactance value Zmax;
when the control circuit controls all thyristors to be conducted fully, the direct current flowing through all direct current coils reaches the maximum design value, and the primary coil of the transformer has the minimum reactance value Zmin.
The closed-loop iron core is provided with at least two iron core columns with equal cross sections, and each of the two iron core columns can form at least one magnetic flux closed loop which does not pass through the iron core column of the other iron core column; and the magnetic control saturable reactor and each coil of the transformer are arranged on the two iron core columns.
The closed-loop iron cores can be two closed-loop iron cores without a passage; or an integral, closed-loop core with three or more core legs having a passage therebetween, wherein any two of the core legs can form a closed magnetic flux loop with each other, but at least two of the core legs can form a closed loop without passing through the core leg of the other core leg.
The closed-loop iron core is provided with a magnetic valve.
The multifunctional transformer with isolated magnetic control adopts the single-phase multifunctional transformer with isolated magnetic control to form a three-phase multifunctional transformer with isolated magnetic control.
The multifunctional transformer with isolated magnetic control adopts the single-phase multifunctional transformer with isolated magnetic control to form a three-phase multifunctional transformer with isolated magnetic control.
The multifunctional transformer with isolated magnetic control adopts the single-phase multifunctional transformer with isolated magnetic control to form a three-phase multifunctional transformer with isolated magnetic control.
The invention has the beneficial effects that: the multifunctional transformer with isolated magnetic control realizes two functions of the transformer and the magnetic control saturable reactor on the basis of one magnetic control saturable reactor iron core. The overall volume of the equipment is reduced, the weight of the iron core of the equipment is reduced, the overall price of the equipment is reduced, and the overall floor area of the equipment is reduced.
The reactance value of the magnetically controlled saturable reactor is adjusted and changed, the load current of the transformer cannot be influenced, and the leakage reactance between the primary coil and the secondary coil of the transformer is slightly influenced. The change of the load current of the transformer does not influence the reactance value of the magnetically controlled saturable reactor.
Drawings
Fig. 1 shows a first magnetically isolated multifunctional transformer.
Fig. 2 shows a second magnetically isolated multi-function transformer.
The transformer comprises a primary coil terminal I, a primary coil terminal II, a secondary coil terminal I, a secondary coil terminal II, a closed-loop iron core 5 and a control circuit 6.
The invention is further described with reference to the following figures and examples.
The specific implementation mode is as follows:
example 1:
the structure and connection mode of the first magnetically controlled isolated multifunctional transformer are shown in fig. 1. The transformer comprises a primary coil terminal I1, a primary coil terminal II2, a secondary coil terminal I3, a secondary coil terminal II4, a closed-loop iron core 5 and a control circuit 6. The closed-loop iron core of the first magnetically-controlled isolated multifunctional transformer is the same as that of the magnetically-controlled saturable reactor. The closed-loop iron core 5 of the first magnetically-controlled isolated multifunctional transformer is provided with at least two iron core columns; two iron core columns with equal cross-sectional areas and both provided with direct current coils and alternating current coils; at least one of the two core legs can form a closed magnetic flux loop without passing through the core leg of the other core leg. One of the iron core columns is provided with an alternating current coil L1, an alternating current coil L3, an alternating current coil L5, an alternating current coil L7 and a direct current coil L9, and the other iron core column is provided with an alternating current coil L2, an alternating current coil L4, an alternating current coil L6, an alternating current coil L8 and a direct current coil L10; the number of turns of ac coil L1 is equal to that of ac coil L2, the number of turns of ac coil L3 is equal to that of ac coil L4, the number of turns of ac coil L5, ac coil L6, ac coil L7 and ac coil L8 is equal, and the number of turns of dc coil L9 is equal to that of dc coil L10. The turns ratio of ac coil L1 to ac coil L3 is equal to the transformer primary to secondary ratio. The number of turns of dc coil L9(L10) is not equal to twice the number of turns of ac coil L5(L6, L7, or L8).
The closed-loop core 5 may be two closed-loop cores having no passage with each other, such as 1: two square iron cores. Or can be an integral closed-loop iron core with a passage; for example, 2: the magnetic flux closed-loop magnetic core comprises three core columns, wherein magnetic yokes are arranged at two ends of each core column and are communicated with the three core columns, any two core columns can mutually form a magnetic flux closed loop, but at least two core columns can respectively form a closed loop which does not pass through the core column of the other core column. For example, 3: four iron core columns, wherein two ends of each iron core column are provided with magnetic yokes to be communicated with the four iron core columns, any two iron core columns can mutually form a magnetic flux closed loop, but at least two iron core columns can respectively form a closed loop which does not pass through the iron core column of the other iron core column, as shown in figure 1.
Ac coil L1 and ac coil L2 are connected in series in the forward direction as a transformer primary coil, and the remaining terminals are connected to primary coil terminal I1 and primary coil terminal II2, respectively. Ac coil L3 and ac coil L4 are connected in series in the forward direction as a transformer secondary, and the remaining terminals are connected to secondary terminal I3 and secondary terminal II4, respectively. The primary coil and the secondary coil are used as the transformer function of the first magnetically-controlled isolated multifunctional transformer.
The dotted terminals of the alternating current coil L5, the dotted terminals of the alternating current coil L6, the dotted terminals of the direct current coil L9 and the dotted terminals of the direct current coil L10 are connected together; the different name end of the alternating current coil L5 is connected with the same name end of the alternating current coil L8, and the different name end of the alternating current coil L6 is connected with the same name end of the alternating current coil L7; the different name end of the alternating current coil L7 is connected with the node N through the different name end of the alternating current coil L7; the different name end of the direct current coil L9 is connected with the node N through a forward thyristor D1, and the different name end of the direct current coil L10 is connected with the node N through a reverse thyristor D1.
The trigger terminals of the thyristor D1 and the thyristor D2 are respectively connected with the control circuit 6, and the control circuit 6 controls the sizes of the trigger angles of the thyristor D1 and the thyristor D2, so that the rectification flow of the thyristor D1 and the thyristor D2 can be continuously adjusted.
And a diode D3 is also connected between the different-name end of the alternating current coil L5 and the same-name end of the alternating current coil L7. The diode D3 is referred to as a freewheeling diode. The fly-wheel diode improves the fly-wheel characteristic of the magnetically controlled saturable reactor and the balance characteristic of the voltage of a coil of the magnetically controlled saturable reactor, and can be removed in some application occasions. The function of the fly-wheel diode of the magnetically controlled saturable reactor is public knowledge and is not described in detail.
The rated voltage of the primary coil of the first magnetically-controlled isolated multifunctional transformer is set to be U1, and the primary coil of the first magnetically-controlled isolated multifunctional transformer is connected to a system with the rated voltage of U1. The ac coil L1 and the ac coil L2 are energized by an exciting current, and an ac magnetic flux is generated in the closed-loop core 5, and the ac magnetic flux generates an induced electromotive force in the ac coil L3 and the ac coil L4, and if a load is connected to the secondary coil formed by the ac coil L3 and the ac coil L4, the secondary coil supplies a load current to the load. The primary coil and the secondary coil are used as the transformer function of the first magnetically-controlled isolated multifunctional transformer.
The first access rated voltage of the primary coil of the first magnetically-controlled isolated multifunctional transformer is U1. The ac coil L1 and the ac coil L2 have excitation current flowing therethrough, and generate an ac magnetic flux in the closed-loop core 5; the alternating current magnetic flux generates induced electromotive force in an alternating current coil L5, an alternating current coil L6, an alternating current coil L7, an alternating current coil L8, a direct current coil L9 and a direct current coil L10, and because the number of turns of a direct current coil L9 is not equal to two times of the number of turns of the alternating current coil L5, voltages exist at two ends of a thyristor D1 and a thyristor D2.
When the control circuit 6 controls the thyristor D1 and the thyristor D2 to be fully turned off, the thyristor D1 and the thyristor D2 rectifier circuit are not operated, and the direct current in the direct current coil L9 and the direct current coil L10 is equal to zero. The primary coil of the first magnetically controlled isolated multifunctional transformer has a maximum reactance value Zmax.
When the control circuit 6 controls the thyristor D1 and the thyristor D2 to be fully turned on, the direct current flowing through the direct current coil L9 and the direct current coil L10 reaches a maximum design value. The primary coil of the first magnetically-controlled isolated multifunctional transformer has a minimum reactance value Zmin.
The control circuit 6 controls the rectification flow of the thyristor D1 and the thyristor D2, and can control the direct current in the direct current coil L9 and the direct current coil L10, so that the reactance value of the primary coil of the first magnetically-controlled isolated multifunctional transformer can be controlled. The control circuit 6 continuously controls the rectification flow of the thyristor D1 and the thyristor D2, can continuously control the direct current in the direct current coil L9 and the direct current coil L10, and realizes the continuous adjustment of the reactance value of the primary coil of the first magnetically-controlled isolated multifunctional transformer, and the reactance value of the primary coil of the first magnetically-controlled isolated multifunctional transformer is adjusted and changed between the maximum value and the minimum value.
It can be seen that the closed-loop iron core 5, the ac coil L5, the ac coil L7 and the dc coil L9, the ac coil L6, the ac coil L8 and the dc coil L10, the thyristor D1 and the thyristor D2, the diode D3, the control circuit 6, and the connection manner thereof shown in fig. 1 are actually magnetic controlled saturable reactors which are not directly electrically connected with the power system. A primary coil and a secondary coil of the transformer are added on the basis of the magnetically controlled saturable reactor, so that a first magnetically controlled isolated multifunctional transformer is formed. The magnetic control saturable reactor is not directly electrically connected with the primary coil and the secondary coil, and is not directly electrically connected with the power system, so that the reactance value of the magnetic control saturable reactor cannot be influenced by the change of load current in the primary coil and the secondary coil. Although the magnetically controlled saturable reactor is not directly electrically connected with the primary coil and the secondary coil, as long as the primary coil and the secondary coil have voltage, alternating current magnetic flux exists in the magnetically controlled saturable reactor closed-loop iron core 5, and the alternating current coil and the direct current coil of the magnetically controlled saturable reactor can obtain alternating current energy from the alternating current magnetic flux of the magnetically controlled saturable reactor closed-loop iron core 5, so that the magnetically controlled saturable reactor is driven to work.
The secondary coil of the first magnetically-isolated multifunctional transformer is connected with a load, so that the magnitude of the direct current in the direct current coil L9 and the direct current coil L10 cannot be changed no matter the load current is increased or reduced, and the magnitude of the reactance value of the first magnetically-isolated multifunctional transformer cannot be influenced.
Experiments show that direct currents in the direct current coil L9 and the direct current coil L10 change within the range of the requirements of the magnetically controlled saturable reactor, the influence on the transformation ratio of the primary voltage and the secondary voltage of the first magnetically controlled isolated multifunctional transformer is small, and the influence on the leakage reactance between the primary coil and the secondary coil of the first magnetically controlled isolated multifunctional transformer is small. Namely, the reactance value of the magnetically controlled saturable reactor is adjusted and changed, the load current of the transformer cannot be influenced, and the leakage reactance of the transformer is slightly influenced.
The closed-loop iron core 5 may adopt a magnetic valve structure to improve current harmonic characteristics. The magnetic valve structure is public knowledge for improving the current harmonic characteristics of the magnetically controlled saturable reactor, and is not described any more.
The structure and connection mode of the first magnetic control isolated multifunctional transformer shown in fig. 1 is a single-phase magnetic control isolated multifunctional transformer. The multifunctional transformer with isolated single-phase magnetic control can be popularized to the multifunctional transformer with isolated three-phase magnetic control. The popularization method is public knowledge and is not described in detail.
The first magnetically controlled isolated multifunctional transformer shown in fig. 1 can adopt a method of connecting resistors in series, so that the transient process of the first magnetically controlled isolated multifunctional transformer is shortened, and the adjustment reaction speed is high. The method of series resistance is referred to CN 201410353026.4; CN 2014104617822.4; CN 201410714156.6.
The two ends of the thyristor D1 and the thyristor D2 can also be connected with a piezoresistor (or a voltage stabilizing diode) in parallel, and the two ends of the thyristor D1 and the thyristor D2 can also be connected with a damping circuit with a resistor and a capacitor connected in series in parallel; to protect thyristor D1 and thyristor D2. This is common knowledge and will not be described in detail. Experiments show that the piezoresistors (or voltage stabilizing diodes) are connected in parallel at the two ends of the thyristor D1 and the thyristor D2, so that the reaction speed of the magnetically controlled saturable reactor can be increased.
It can be seen that the magnetically controlled saturable reactor shown in fig. 1, which is composed of the closed-loop iron core 5, the ac coil L5, the ac coil L7 and the dc coil L9, the ac coil L6, the ac coil L8 and the dc coil L10, the thyristor D1 and the thyristor D2, the diode D3, the control circuit 6, and the connection modes thereof, is only an example. The magnetically controlled saturable reactor can have various structures and forms, and a primary coil and a secondary coil are added on the basis of other magnetically controlled saturable reactors, so that a multifunctional transformer with isolated magnetically controlled functions can be formed.
The primary coil may also take a variety of forms in order to enhance its effect.
Example 2:
the present example provides a primary coil form different from that of example 1, and provides a magnetically controlled saturable reactor form different from that of example 1. The same portions as those in embodiment 1 will not be described again. The different parts are expressed as follows.
The structure and connection mode of the second magnetically controlled isolated multifunctional transformer are shown in fig. 2. The transformer comprises a primary coil terminal I1, a primary coil terminal II2, a secondary coil terminal I3, a secondary coil terminal II4, a closed-loop iron core 5 and a control circuit 6. The closed-loop iron core of the second magnetically-controlled isolated multifunctional transformer is the same as that of the magnetically-controlled saturable reactor. The closed-loop iron core 5 of the second magnetically-controlled isolated multifunctional transformer is provided with at least two iron core columns; two iron core columns with equal cross-sectional areas and both provided with direct current coils and alternating current coils; at least one of the two core legs can form a closed magnetic flux loop without passing through the core leg of the other core leg. One of the iron core columns is provided with an alternating current coil L11, an alternating current coil L13, an alternating current coil L15, a direct current coil L17 and a direct current coil L19, and the other iron core column is provided with an alternating current coil L12, an alternating current coil L14, an alternating current coil L16, a direct current coil L18 and a direct current coil L20; the number of turns of ac coil L11, ac coil L12, ac coil L13, and ac coil L14 is equal, the number of turns of ac coil L15 is equal to that of ac coil L16, the number of turns of dc coil L17 is equal to that of dc coil L20, and the number of turns of dc coil L18 is equal to that of dc coil L19. Dc coil L17 has no equal number of turns to dc coil L18, and dc coil L19 has no equal number of turns to dc coil L20. The turns ratio of ac coil L11 to ac coil L15 is equal to 2 times the transformer primary to secondary ratio.
Ac coil L11 and ac coil L14 are connected in series in the forward direction between primary coil terminal I1 and primary coil terminal II2, and ac coil L12 and ac coil L13 are connected in series in the forward direction between primary coil terminal I1 and primary coil terminal II 2. Ac coil L15 and ac coil L16 are connected in series in the forward direction as a transformer secondary, and the remaining terminals are connected to secondary terminal I3 and secondary terminal II4, respectively. The primary coil and the secondary coil are used as the transformer function of a second magnetically-controlled isolated multifunctional transformer.
And a diode D3 is also connected between the different-name end of the alternating current coil L11 and the same-name end of the alternating current coil L13. The diode D3 is referred to as a freewheeling diode. The freewheeling diode provides voltage balance characteristics for each alternating current coil and direct current coil on the second magnetically-controlled isolated multifunctional transformer, and the freewheeling diode can be eliminated in some application occasions. The effect of the freewheeling diode of the primary coil is similar to that of the freewheeling diode of the magnetically controlled saturable reactor, is public knowledge and is not described in detail.
The homonymous end of the direct current coil L17 is connected with the homonymous end of the direct current coil L18, the homonymous end of the direct current coil L19 is connected with the homonymous end of the direct current coil L20, the synonym end of the direct current coil L17 is connected with the node N through a forward thyristor D1, the synonym end of the direct current coil L20 is connected with the node N through a reverse thyristor D1, the synonym end of the direct current coil L18 is connected with the node N, and the synonym end of the direct current coil L19 is connected with the node N.
The trigger terminals of the thyristor D1 and the thyristor D2 are respectively connected with the control circuit 6, and the control circuit 6 controls the sizes of the trigger angles of the thyristor D1 and the thyristor D2, so that the rectification flow of the thyristor D1 and the thyristor D2 can be continuously adjusted.
And setting the rated voltage of the primary coil of the second magnetically-controlled isolated multifunctional transformer as U1, and switching the primary coil of the first magnetically-controlled isolated multifunctional transformer into a system with the rated voltage of U1. The ac coil L11, the ac coil L12, the ac coil L13, and the ac coil L14 are energized with an exciting current, and an ac magnetic flux is generated in the closed-loop core 5, and the ac magnetic flux generates an induced electromotive force in the ac coil L15 and the ac coil L16, and if a load is connected to the secondary coil formed by the ac coil L15 and the ac coil L16, the secondary coil supplies a load current to the load. The primary coil and the secondary coil are used as the transformer function of a second magnetically-controlled isolated multifunctional transformer.
The first access rated voltage of the primary coil of the second magnetically-controlled isolated multifunctional transformer is U1. The ac coil L11, the ac coil L12, the ac coil L13, and the ac coil L14 are energized with an exciting current, and an ac magnetic flux is generated in the closed-loop core 5; the alternating current magnetic flux generates alternating current induced electromotive force in the direct current coil L17, the direct current coil L18, the direct current coil L19 and the direct current coil L20, and since the turns of the direct current coil L17 are not equal to the turns of the direct current coil L18, alternating current voltage exists at two ends of the thyristor D1, and since the turns of the direct current coil L19 are not equal to the turns of the direct current coil L20, alternating current voltage exists at two ends of the thyristor D2.
When the control circuit 6 controls the thyristor D1 and the thyristor D2 to be fully turned off, the thyristor D1 and the thyristor D2 rectifier circuit are not operated, and the direct current in the direct current coil L17, the direct current coil L18, the direct current coil L19 and the direct current coil L20 is equal to zero. The primary coil of the second magnetically-controlled isolated multifunctional transformer has the maximum reactance value Zmax.
When the control circuit 6 controls the thyristor D1 and the thyristor D2 to be fully turned on, the dc current flowing through the dc coil L17, the dc coil L18, the dc coil L19 and the dc coil L20 reaches the maximum design value. The primary coil of the second magnetically-controlled isolated multifunctional transformer has a minimum reactance value Zmin.
The control circuit 6 controls the rectification flow of the thyristor D1 and the thyristor D2, and can control the direct current in the direct current coil L17, the direct current coil L18, the direct current coil L19 and the direct current coil L20, so that the reactance value of the primary coil of the second magnetically-controlled isolated multifunctional transformer can be controlled. The control circuit 6 continuously controls the rectification flow of the thyristor D1 and the thyristor D2, can continuously control the direct current in the direct current coil L17, the direct current coil L18, the direct current coil L19 and the direct current coil L20, realizes the continuous adjustment of the reactance value of the primary coil of the second magnetically-controlled isolated multifunctional transformer, and adjusts and changes the reactance value of the primary coil of the second magnetically-controlled isolated multifunctional transformer between the maximum value and the minimum value.
The common parts of embodiment 2 and embodiment 1 will not be described again.
The multifunctional transformer with isolated magnetic control can be designed and manufactured by the prior art and can be completely realized. Has wide application prospect.
Claims (15)
1. A multifunctional transformer with isolated magnetic control is characterized in that the transformer is single-phase and comprises a magnetic control saturable reactor and a transformer which are arranged on the same closed-loop iron core; wherein,
the transformer consists of a primary coil and a secondary coil, and the transformation ratio of the primary coil to the secondary coil is equal to the transformation ratio of the transformer;
the magnetically controlled saturable reactor comprises alternating current coils, direct current coils and a control circuit, and the coils are not directly connected with the primary coil and the secondary coil of the transformer and are not connected to a power system;
the control circuit adjusts the direct current of the magnetically controlled saturable reactor, and the reactance value of the primary coil is continuously adjusted.
2. The magnetically controlled isolated multifunctional transformer of claim 1, wherein the primary and secondary windings of said transformer are each comprised of a pair of ac windings mounted on two legs and connected in series in the forward direction;
the magnetically controlled saturable reactor comprises two groups of coils positioned on two iron core columns, and the two groups of coils have the same structure; each group of coils comprises a first alternating current coil, a second alternating current coil and a direct current coil; the homonymous ends of the two first direct current coils and the homonymous ends of the two direct current coils are connected together;
the synonym ends of the two direct current coils are connected with a contact N through a forward thyristor and a reverse thyristor;
the different name end of the first alternating current coil on each iron core column is connected with the same name end of the second alternating current coil on the other iron core column; the synonyms of the two second coils are connected with a connection point N;
the control ends of the two thyristors are connected with the control circuit, the control circuit controls the triggering angles of the two thyristors, the rectification quantity of the two thyristors is continuously adjusted, and the direct current of the two direct current coils is adjusted.
3. The magnetically controlled isolated multifunctional transformer of claim 2, wherein said primary winding has equal turns of two ac windings; the two alternating current coils of the secondary coil have equal turns; the turn ratio of each alternating current coil of the primary coil to each alternating current coil of the secondary coil is equal to the transformation ratio of the primary coil and the secondary coil of the transformer.
4. The magnetically controlled isolated multifunctional transformer according to claim 2, wherein a freewheeling diode is connected in series between the first ac winding and the second ac winding of the same core leg in the magnetically controlled saturable reactor.
5. The magnetically controlled isolated multifunctional transformer according to claim 2, wherein each ac coil in the magnetically controlled saturable reactor has the same number of turns; the number of turns of each direct current coil is equal; the number of turns of each direct current coil is not equal to twice of the number of turns of the first alternating current coil on the iron core column where the direct current coil is located, so that voltage exists at two ends of the two thyristors.
6. The magnetically controlled isolated multifunctional transformer of claim 1, wherein said primary winding of the transformer is comprised of two pairs of ac windings connected in series in the forward direction, the two ac windings of each pair of ac windings being located on different legs; the homonymous ends of two alternating current coils at the same position in the two pairs of alternating current coils are connected, and the heteronymous ends of the rest two alternating current coils are connected; the secondary coil is formed by a pair of forward series AC coils positioned on the two iron core columns;
the magnetic control saturation electric controller consists of two groups of direct current coils which are respectively positioned on different iron core columns; the two direct current coils at the same position on the two iron core columns in each group of direct current coils are connected at the same name end; in the rest synonym terminals, one of the two synonym terminals of the direct current coil of the same group is directly connected with the connection point N, and the other is connected with the connection point N through a forward or reverse thyristor, but the positions of the direct current coils connected with the thyristors are not corresponding to the positions of the iron core columns; each thyristor is connected with the control circuit; the control circuit controls the triggering angles of the two thyristors, so that the rectification quantity of the two thyristors is continuously adjusted, and the direct current of the two direct current coils is adjusted.
7. The magnetically controlled isolated multifunctional transformer of claim 6, wherein said primary windings have equal number of turns of each ac winding; the turns of the alternating current coils of the secondary coil are equal;
the number of turns of each alternating current coil of the primary coil and the number of turns of each alternating current coil of the secondary coil are equal to 2 times of the transformation ratio of the primary coil and the secondary coil of the transformer.
8. The magnetically controlled isolated multifunctional transformer of claim 6, wherein a freewheeling diode is connected in series between two ac windings on the same core leg of said primary winding.
9. The magnetically controlled isolated multifunctional transformer of claim 2 or 6, wherein when the control circuit controls the two thyristors to be fully cut off, the rectifying circuits of the two thyristors are not operated, the dc current of each dc coil is equal to zero, and the primary coil of the transformer has a maximum reactance value Zmax;
when the control circuit controls all thyristors to be conducted fully, the direct current flowing through all direct current coils reaches the maximum design value, and the primary coil of the transformer has the minimum reactance value Zmin.
10. The magnetically controlled isolated multifunctional transformer of any one of claims 1-9, wherein said closed-loop core comprises at least two core legs of equal cross-sectional area, each of said two core legs forming at least one closed loop of magnetic flux that does not pass through the other core leg; and the magnetic control saturable reactor and each coil of the transformer are arranged on the two iron core columns.
11. The magnetically controlled isolated multifunctional transformer of any one of claims 1-9, wherein said closed-loop iron core can be two closed-loop iron cores without a passage therebetween;
or an integral, closed-loop core with three or more core legs having a passage therebetween, wherein any two of the core legs can form a closed magnetic flux loop with each other, but at least two of the core legs can form a closed loop without passing through the core leg of the other core leg.
12. The magnetically controlled isolated multifunctional transformer of any one of claims 1-9, wherein said closed-loop core has magnetic valves.
13. A magnetically isolated multifunctional transformer, characterized in that it is composed of a single-phase magnetically isolated multifunctional transformer according to claim 1.
14. A magnetically isolated multifunctional transformer, characterized in that it is composed of a single-phase magnetically isolated multifunctional transformer according to claim 2.
15. A magnetically isolated multifunctional transformer, characterized in that it is a three-phase magnetically isolated multifunctional transformer composed of the single-phase magnetically isolated multifunctional transformer of claim 6.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510010431.0A CN104485824B (en) | 2015-01-08 | 2015-01-08 | Multifunctional transformer with isolated magnetic control |
| PCT/CN2015/075725 WO2016110013A1 (en) | 2015-01-08 | 2015-04-01 | Magnetically-controlled isolated multifunctional transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510010431.0A CN104485824B (en) | 2015-01-08 | 2015-01-08 | Multifunctional transformer with isolated magnetic control |
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| CN104485824A true CN104485824A (en) | 2015-04-01 |
| CN104485824B CN104485824B (en) | 2017-01-18 |
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| WO (1) | WO2016110013A1 (en) |
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| CN105141140A (en) * | 2015-07-31 | 2015-12-09 | 山东大学 | Improved multi-functional transformer |
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| Publication number | Publication date |
|---|---|
| CN104485824B (en) | 2017-01-18 |
| WO2016110013A1 (en) | 2016-07-14 |
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