CN114171307A - Split winding type on-load voltage regulating transformer - Google Patents
Split winding type on-load voltage regulating transformer Download PDFInfo
- Publication number
- CN114171307A CN114171307A CN202111509657.7A CN202111509657A CN114171307A CN 114171307 A CN114171307 A CN 114171307A CN 202111509657 A CN202111509657 A CN 202111509657A CN 114171307 A CN114171307 A CN 114171307A
- Authority
- CN
- China
- Prior art keywords
- winding
- voltage
- split
- module
- load tap
- 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.)
- Granted
Links
- 238000004804 winding Methods 0.000 title claims abstract description 231
- 230000001105 regulatory effect Effects 0.000 title description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 66
- 238000002955 isolation Methods 0.000 claims description 10
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- 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
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
-
- 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
-
- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention relates to the technical field of transformers, in particular to a split winding type on-load tap changing transformer, and aims to solve the problems of how to realize stepless voltage regulation of the on-load tap changing transformer and improve the speed and reliability of on-load voltage regulation. For the purpose, the primary side of the on-load tap changer comprises an on-load tap changer connected with a power supply line of a power grid in three phases, the on-load tap changer comprises a primary side winding, a winding switching module and an electric energy conversion module, the primary side winding comprises a main winding with a common magnetic core, a stepless energy taking winding and at least one stepped winding, and the stepless energy taking winding comprises three split windings; the winding switching module can carry out switching control on the stepped winding; the electric energy conversion module can convert the winding voltage of each split winding and apply the winding voltage after electric energy conversion to the primary winding through a power supply line so as to realize stepless regulation of the winding voltage of the primary winding.
Description
Technical Field
The invention relates to the technical field of transformers, and particularly provides a split winding type on-load tap changing transformer.
Background
At present, a conventional On-Load Tap Changer (OLTC) mainly performs voltage regulation (stepped voltage regulation) according to a preset fixed step length by determining a good On-Load voltage regulation range according to a primary side winding combination of a transformer through a mechanical switch. Because the voltage can be adjusted only according to the preset fixed step length, the voltage waveform is not smooth enough in the transition in the voltage adjusting process, and stepless voltage adjustment cannot be realized. Meanwhile, in the voltage regulation process, the voltage division joint of the transformer is limited by the mechanical characteristics of the mechanical switch, certain time delay exists during action, the voltage regulation response time is long, and on-load voltage regulation cannot be completed quickly. In addition, the action times of the voltage division joint are limited, and after the action times exceed a certain number of times, the mechanical life of the voltage division joint is greatly reduced, so that the transformer cannot be ensured to continuously and reliably carry out on-load voltage regulation.
Accordingly, there is a need in the art for a new on-load tap changer solution to the above-mentioned problems.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks, the present invention is proposed to provide a split winding type on-load tap changer that solves or at least partially solves the technical problem of how to make an on-load tap changer achieve stepless voltage regulation and improve speed and reliability of on-load tap changing, the primary side of the on-load tap changer comprising an on-load tap changing device connected to the power supply line of the power grid; the on-load voltage regulation device comprises a primary side winding, a winding switching module and an electric energy conversion module, wherein the primary side winding comprises a main winding with a common magnetic core, a stepless energy taking winding and at least one stepped winding, and the stepless energy taking winding comprises three split windings;
the winding switching module comprises a switch connected with the primary winding, and the winding switching module is configured to control at least one primary winding to be switched in or switched out of the primary winding through the switch;
the first end of the electric energy conversion module is respectively connected with each split winding, the second end of the electric energy conversion module is respectively connected with a power supply line connected with each phase of on-load voltage regulation device, and the electric energy conversion module is configured to respectively perform electric energy conversion on the winding voltage of each split winding and apply the winding voltage after the electric energy conversion to the primary winding through the corresponding power supply line so as to realize stepless regulation on the winding voltage of the primary winding.
In one technical solution of the split winding type on-load tap changer, the switch is a flexible switch or a mechanical switch composed of power electronic devices;
the power electronic device at least comprises thyristors, the flexible switch comprises at least N thyristor components, N is more than or equal to 2, and each thyristor component comprises two thyristors which are reversely connected in parallel;
the at least one stepped winding is sequentially connected in series, the first end of the first stepped winding is connected with the main winding, and the second end of the last stepped winding is connected with the stepless energy taking winding;
the first ends of the 1 st to N-1 th thyristor assemblies are respectively connected with the first end of each stepped winding, the second ends of the 1 st to N th thyristor assemblies are mutually connected, and the first end of the Nth thyristor assembly is connected with the second end of the last stepped winding.
In one technical scheme of the split winding type on-load tap changing transformer, the electric energy conversion module comprises a rectifier submodule, three inverter submodules and three isolation transformers;
the alternating current side of the rectifier submodule is sequentially connected with the three split windings respectively, and the direct current side of the rectifier submodule is connected with the direct current sides of the three inverter submodules respectively;
and the alternating current side of each inversion sub-module is respectively connected with the first end of an isolation transformer, and the second end of each isolation transformer is respectively connected with the second end of the electric energy conversion module so as to be respectively connected with a power supply line connected with each phase of on-load voltage regulation device through the second end of the electric energy conversion module.
In one technical scheme of the split winding type on-load tap changer, the rectifier sub-module is an H-bridge rectifier sub-module composed of power electronic devices, and the inverter sub-module is an H-bridge inverter sub-module composed of power electronic devices.
In one technical solution of the split winding type on-load tap changer, the power electronic device of the rectifier sub-module is a controllable power electronic device or an uncontrollable power electronic device.
In an aspect of the split-winding on-load tap changer, the power conversion module is further configured to perform the following operations to convert the winding voltage of the split winding into power:
and performing double closed-loop control on the rectifier submodule by taking the direct-current side voltage of the rectifier submodule as an outer-loop control quantity and taking the current as an inner-loop control quantity, and performing double closed-loop control on the inverter submodule by taking the alternating-current side voltage of the inverter submodule as an outer-loop control quantity and taking the current as an inner-loop control quantity to realize electric energy conversion on the winding voltage of the split winding.
In one technical scheme of the split winding type on-load tap changer, the three-phase on-load tap changer is connected with a power supply line of a power grid after being connected in a triangular connection mode or a star connection mode.
One or more technical schemes of the invention at least have one or more of the following beneficial effects:
in the technical scheme of the invention, the primary side of the split winding type on-load tap changer comprises three phases of on-load tap changers connected with a power supply line of a power grid; the on-load voltage regulation device can comprise a primary side winding, a winding switching module and an electric energy conversion module, wherein the primary side winding can comprise a main winding with a common magnetic core, a stepless energy taking winding and at least one stepped winding, and the stepless energy taking winding comprises three split windings; the winding switching module may include a switch connected to the stepped winding, and the winding switching module may be configured to control the at least one stepped winding to be switched in or switched out of a primary side winding of the on-load voltage regulation device through the switch; the first end of the electric energy conversion module is respectively connected with each split winding, the second end of the electric energy conversion module is respectively connected with a power supply line connected with each phase of on-load voltage regulation device, and the electric energy conversion module can be configured to respectively carry out electric energy conversion on the winding voltage of each split winding and apply the winding voltage after the electric energy conversion to the primary side winding through the corresponding power supply line so as to realize stepless regulation on the winding voltage of the primary side winding.
The switching control is carried out on one or more stepped windings, so that the stepped regulation of the winding voltage of the primary side winding can be realized, and the voltage regulation of different levels can be realized by connecting different numbers of stepped windings into the primary side winding. For example, a first level of voltage regulation may be achieved by coupling one of the secondary windings to the primary winding, and a second level of voltage regulation may be achieved by coupling two of the secondary windings to the primary winding. The winding voltage of each split winding in the stepless energy-taking winding is subjected to electric energy conversion through the electric energy conversion module, so that the winding voltage of the split winding can be converted into a voltage with any voltage amplitude and/or any voltage phase within a preset conversion range, namely, the output voltage of the electric energy conversion module is a voltage with continuously adjustable voltage amplitude and phase. Under the condition that the voltage of a power grid in a power supply line is fixed and unchanged, the winding voltage of a primary side winding of the on-load transformer can be changed by changing the output voltage of the electric energy conversion module, and meanwhile, the winding voltage of the primary side winding is continuously adjustable because the output voltage of the electric energy conversion module is continuously adjustable, so that the stepless regulation of the winding voltage of the primary side winding is realized.
Referring to FIG. 1, in an example application scenario, U1Representing line voltage, U, between the phase gridsL1Representing the winding voltage of the main winding in an a-phase on-load tap changer, UL2Representing the winding voltage, U, formed by all the stepped windings connected to the supply line in an a-phase on-load tap changerabThe voltage of the second end of the electric energy conversion module in the a-phase on-load voltage regulation device is input into the power supply circuit
(L1Indicating the inductance value of the main winding, L2Representing the inductance of the step winding, i1Representing the current through the main winding, i2Representing current flowing through the stepped winding) in U1Can adjust the voltage U under the unchanged conditionabTo UL1+UL2Performing voltage compensation, and voltage UabThe voltage amplitude of (1) is between 0 and the maximum value, voltage UabIs 0 to 360 deg., i.e. the voltage U can be adjustedabAnd converting the voltage into the voltage with any voltage amplitude and/or any voltage phase within the range (preset conversion range) shown by the circle in fig. 1. By regulating the voltage U in stagesL2And simultaneously regulating the voltage UabCan continuously and steplessly adjust UL1+UL2Voltage and amplitude of (d). Further, I in FIG. 1LRepresenting the current flowing through the main winding and the secondary winding,
represents the current ILThe phase of (a) is determined,
represents a voltage U1The phase of (a) is determined,
indicating that the main winding and the stepped winding form a series windingThe phase of the winding voltage.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. Wherein:
fig. 1 is a schematic diagram of the principle of stepless regulation of an on-load tap changer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a topology of an on-load tap changer according to an embodiment of the invention;
FIG. 3 is a schematic diagram of the control principle of the stepped voltage regulation according to one embodiment of the present invention;
fig. 4 is a schematic diagram of a topology of an on-load tap changer according to another embodiment of the invention;
fig. 5 is a schematic diagram of a topology of an on-load tap changer according to yet another embodiment of the invention;
fig. 6 is a flow chart illustrating the main steps of a control method for stepless voltage regulation according to an embodiment of the present invention.
Detailed Description
Some embodiments of the invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
Referring to fig. 2, fig. 2 is a schematic diagram of the main topology of a split-winding on-load tap changer according to one embodiment of the present invention. As shown in fig. 2, the primary side of the split winding type on-load tap changer in the embodiment of the present invention includes an on-load tap changer in which three phases are connected to a power supply line of a power grid; the on-load voltage regulation device comprises a primary side winding, a winding switching module and an electric energy conversion module, wherein the primary side winding comprises a main winding with a common magnetic core, a stepless energy taking winding and at least one stepped winding, and the stepless energy taking winding comprises three split windings.
The winding switching module may include a switch connected to the stepped winding, and the winding switching module may be configured to control the at least one stepped winding to be switched into or switched out of the primary side winding of the on-load voltage regulation device through the switch. The switching control is carried out on one or more stepped windings, so that the stepped regulation of the winding voltage of the primary side winding can be realized, and the voltage regulation of different levels can be realized by connecting different numbers of stepped windings into the primary side winding. For example, a first level of voltage regulation may be achieved by coupling one of the secondary windings to the primary winding, and a second level of voltage regulation may be achieved by coupling two of the secondary windings to the primary winding.
The first end of the electric energy conversion module is respectively connected with each split winding, the second end of the electric energy conversion module is respectively connected with a power supply line connected with each phase of on-load voltage regulation device, and the electric energy conversion module is configured to respectively carry out electric energy conversion on the winding voltage of each split winding and apply the winding voltage after the electric energy conversion to the primary side winding through the corresponding power supply line so as to realize stepless regulation on the winding voltage of the primary side winding. The winding voltage of each split winding in the stepless energy-taking winding is subjected to electric energy conversion through the electric energy conversion module, so that the winding voltage of the split winding can be converted into the voltage with any voltage amplitude and/or any voltage phase in a preset conversion range, namely, the output voltage of the electric energy conversion module is the voltage with continuously adjustable voltage amplitude and phase. Under the condition that the voltage of a power grid in a power supply line is fixed and unchanged, the winding voltage of a primary side winding of the on-load transformer can be changed by changing the output voltage of the electric energy conversion module, and meanwhile, the winding voltage of the primary side winding is continuously adjustable because the output voltage of the electric energy conversion module is continuously adjustable, so that the stepless regulation of the winding voltage of the primary side winding is realized.
The winding switching module and the electric energy conversion module are further described below.
1. Winding switching module
In one embodiment, the switch may be a flexible switch, the flexible switch is a switch composed of a Power Electronic Device (Power Electronic Device), and switching control can be performed on the stepped winding quickly and reliably based on the Power Electronic Device, so that the defects that on-load voltage regulation cannot be completed quickly due to long response time when a mechanical switch is used for switching control on the winding, and continuous and reliable on-load voltage regulation of a transformer cannot be guaranteed after the mechanical life of the mechanical switch is reduced in the prior art are overcome. The power electronic device may be a fully-controlled power Semiconductor device, such as a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), an Integrated Gate Commutated Thyristor (IGCT), or a Thyristor (Thyristor).
The flexible switch at least comprises N Thyristor assemblies, wherein N is more than or equal to 2, each Thyristor assembly respectively comprises two thyristors (thyristors) which are connected in inverse parallel, and the thyristors are unidirectional thyristors. The primary side windings are sequentially connected in series, the first end of the first stepped winding is connected with the main winding, and the second end of the last stepped winding is connected with the stepless energy taking winding. On the basis, the first ends of the 1 st to N-1 st thyristor assemblies are respectively connected with the first end of each stepped winding, the second ends of the 1 st to N th thyristor assemblies are mutually connected, and the first end of the Nth thyristor assembly is connected with the second end of the last stepped winding.
With continued reference to fig. 2, the flexible switch includes a thyristor assembly 1 to a thyristor assembly N, taking the thyristor assembly 1 as an example, the thyristor assembly 1 includes thyristors G1 and G2 connected in inverse parallel, a first end of the thyristor assembly 1 is connected to a first end of the stepped winding S1, and a second end of the thyristor assembly 1 is connected to second ends of other thyristor assemblies. Wherein, the first terminal of the thyristor assembly 1 refers to a terminal at which the anode of the thyristor G1 and the cathode of the thyristor G2 are simultaneously connected, and the second terminal of the thyristor assembly 1 refers to a terminal at which the cathode of the thyristor G1 and the anode of the thyristor G2 are simultaneously connected. The connection structure and the first/second terminals of each of the thyristor components 2 to N are the same as those of the thyristor component 1, and are not described herein again. Referring to fig. 3, the pwm (pulse Width modulation) modulation pulses may be sent to the power electronics in the flexible switch by the control system to control the on/off of the power electronics, so as to switch the corresponding stepped winding into or out of the primary winding.
When the flexible switch is used for switching control over the primary winding, the primary winding can be connected to or cut off from the primary winding by controlling the conduction or the disconnection of a thyristor in the thyristor assembly. Taking the stepped winding S1 as an example, if the stepped winding S1 needs to be connected to the primary winding, the thyristors G1 and G2 in the thyristor assembly 1 can be controlled to be turned off; the thyristors G1 and G2 in the thyristor assembly 1 can be controlled to be alternately turned on/off according to the positive and negative polarities of the alternating current input to the primary side winding through the power supply line if the stepped winding S1 is cut off from the primary side winding as needed.
In another embodiment, as shown in fig. 4, the switch may be a mechanical switch, and the secondary winding is switched in or switched out of the primary winding by controlling the opening and closing of the mechanical switch.
2. Electric energy conversion module
The power conversion module may include a rectifier sub-module, three inverter sub-modules, and three isolation transformers. The alternating current side of the rectifier submodule is respectively connected with the three split windings in sequence, and the direct current side of the rectifier submodule is respectively connected with the direct current sides of the three inverter submodules; the alternating current side of each inversion sub-module is respectively connected with the first end of an isolation transformer, and the second end of each isolation transformer is respectively connected with the second end of the electric energy conversion module so as to be respectively connected with a power supply line connected with each phase of on-load voltage regulation device through the second end of the electric energy conversion module. The rectifier sub-module can convert alternating current on the stepless energy taking winding into direct current, the inverter sub-module can convert the direct current into alternating current, the alternating current is input into a power supply circuit through the isolation transformer, and the alternating current is input into the primary side winding through the power supply circuit.
In this embodiment, a rectifier sub-module and an inverter sub-module may be respectively constructed by using a conventional rectifier topology and an inverter topology in the field of electric energy conversion technology. In a preferred embodiment, the rectifier sub-module and the inverter sub-module may be constructed by using an H-bridge topology, that is, the rectifier sub-module may be an H-bridge rectifier sub-module composed of power electronic devices, and the inverter sub-module may be an H-bridge inverter sub-module composed of power electronic devices. In this embodiment, different types of power electronic devices can be selected according to actual requirements to construct the rectifier module, as shown in fig. 2, controllable power electronic devices such as IGBTs can be used to construct the rectifier module, and as shown in fig. 5, uncontrollable power electronic devices such as diodes can also be used to construct the rectifier module.
The power conversion module in this embodiment may be configured to power convert the winding voltage of the split winding by performing the following operations:
and performing double closed-loop control on the rectification submodule by taking the direct-current side voltage of the rectification submodule as an outer-loop control quantity and the current as an inner-loop control quantity, and performing double closed-loop control on the inversion submodule by taking the alternating-current side voltage of the inversion submodule as an outer-loop control quantity and the current as an inner-loop control quantity to realize electric energy conversion on winding voltage of the split winding.
Referring to fig. 6, fig. 6 illustrates a flow of main steps of a control method for stepless voltage regulation by a power conversion module according to an embodiment of the present invention. As shown in fig. 6, the method for controlling the stepless voltage regulation by the power conversion module mainly includes the following steps S101 to S107.
Step S101: three-phase alternating current is input.
In this embodiment, the three-phase ac power is the ac power input to the power conversion module by the split winding.
Step S102: and carrying out park conversion on the three-phase voltage and converting the three-phase voltage to a dq coordinate axis.
In this embodiment, the coordinate transformation may be performed on the three-phase voltages among the three-phase alternating currents input in step S101.
Step S103: and setting rated ud and uq, and performing tracking control through a PI regulator.
In this embodiment, the rated ud and uq refer to rated values of voltage components of the three-phase voltage on the d axis and the q axis, the rated ud and uq are tracking quantities, the actual ud and uq are control quantities, and the actual ud and uq are tracked and controlled by the PI regulator, so that the actual ud and uq are respectively consistent with the rated ud and uq.
Step S104: and carrying out park inverse transformation on ud and uq.
Step S105: the space voltage reference vector Uref is synthesized by adopting svpwm (space vector pulse width modulation), a PWM generator is used for sending out PWM pulse, and direct-current voltage is output.
In the embodiment, after park inverse transformation is performed on ud and uq, a space voltage reference vector Uref is determined according to a transformation result, PWM pulses are determined according to the space voltage reference vector Uref by adopting svpwm modulation, a PWM generator is controlled to emit corresponding PWM pulses, a rectification inverter sub-module can convert three-phase alternating current into direct current under the control of the PWM pulses, and direct current voltage is output to the inverter sub-module.
Step S106: by controlling the period and the duty ratio of the PWM pulse, the H bridge of each phase inverts the direct current voltage into alternating current voltage with adjustable amplitude phase angle.
Step S107: the alternating voltage is used as compensation voltage to be matched with the step voltage regulation, and the stepless voltage regulation is realized. Referring to fig. 1, the ac voltage is the voltage U output by the power conversion module to the power supply lineabThe step voltage regulation is the voltage UL2By regulating the voltage U in stagesL2And simultaneously regulating the voltage UabCan continuously and steplessly adjust UL1+UL2The stepless voltage regulation is realized by the voltage and the amplitude.
The steps S101 to S105 relate to rectification control of the rectifier submodule, the step S106 relates to inversion control of the inverter submodule, and the specific methods of the steps in the rectification control and the inversion control may all adopt conventional rectification and inversion control methods in the technical field of electric energy conversion, and are not described herein again.
Further, in another embodiment of the split-winding on-load tap changer according to the present invention, the primary side of the split-winding on-load tap changer may include a three-phase on-load tap changing device, and the three-phase on-load tap changing device is connected to a power supply line of a power grid after being connected in a delta connection manner or a star connection manner, and a topology structure of the on-load tap changing device is the same as that of the on-load tap changing device in the embodiment of the split-winding on-load tap changer, and therefore, details thereof are not repeated. As shown in fig. 2, 4 and 5, in one embodiment, three-phase on-load tap changing devices are connected in a delta connection manner, and the main difference of the on-load tap changing transformers shown in fig. 2, 4 and 5 is that the power electronic devices of the rectifier modules in the on-load tap changing device shown in fig. 2 are controllable power electronic devices such as IGBTs, and the switches are flexible switches; in the on-load voltage regulation device shown in fig. 4, the power electronic devices of the rectifier modules are controllable power electronic devices such as IGBTs, and the switches are mechanical switches; the power electronics of the rectifier module in the on-load tap changer shown in fig. 5 are uncontrollable power electronics such as diodes and the switches are flexible switches.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (7)
1. A split winding type on-load tap changer is characterized in that the primary side of the on-load tap changer comprises an on-load tap changer of which the three phases are connected with a power supply line of a power grid; the on-load voltage regulation device comprises a primary side winding, a winding switching module and an electric energy conversion module, wherein the primary side winding comprises a main winding with a common magnetic core, a stepless energy taking winding and at least one stepped winding, and the stepless energy taking winding comprises three split windings;
the winding switching module comprises a switch connected with the primary winding, and the winding switching module is configured to control at least one primary winding to be switched in or switched out of the primary winding through the switch;
the first end of the electric energy conversion module is respectively connected with each split winding, the second end of the electric energy conversion module is respectively connected with a power supply line connected with each phase of on-load voltage regulation device, and the electric energy conversion module is configured to respectively perform electric energy conversion on the winding voltage of each split winding and apply the winding voltage after the electric energy conversion to the primary winding through the corresponding power supply line so as to realize stepless regulation on the winding voltage of the primary winding.
2. The split-winding on-load tap changer of claim 1, wherein the switch is a flexible switch or a mechanical switch comprised of power electronics;
the power electronic device at least comprises thyristors, the flexible switch comprises at least N thyristor components, N is more than or equal to 2, and each thyristor component comprises two thyristors which are reversely connected in parallel;
the at least one stepped winding is sequentially connected in series, the first end of the first stepped winding is connected with the main winding, and the second end of the last stepped winding is connected with the stepless energy taking winding;
the first ends of the 1 st to N-1 th thyristor assemblies are respectively connected with the first end of each stepped winding, the second ends of the 1 st to N th thyristor assemblies are mutually connected, and the first end of the Nth thyristor assembly is connected with the second end of the last stepped winding.
3. The split-winding on-load tap changer of claim 1, wherein the power conversion module comprises a rectifier sub-module, three inverter sub-modules, and three isolation transformers;
the alternating current side of the rectifier submodule is sequentially connected with the three split windings respectively, and the direct current side of the rectifier submodule is connected with the direct current sides of the three inverter submodules respectively;
and the alternating current side of each inversion sub-module is respectively connected with the first end of an isolation transformer, and the second end of each isolation transformer is respectively connected with the second end of the electric energy conversion module so as to be respectively connected with a power supply line connected with each phase of on-load voltage regulation device through the second end of the electric energy conversion module.
4. The split-winding on-load tap changer of claim 3, wherein the rectifier sub-module is an H-bridge rectifier sub-module comprising power electronics, and the inverter sub-module is an H-bridge inverter sub-module comprising power electronics.
5. The split-winding on-load tap changer of claim 4, wherein the power electronics of the rectifier sub-module are controllable or non-controllable.
6. The split-winding on-load tap changer of claim 3, wherein the power conversion module is further configured to perform the following operations for power conversion of the winding voltage of the split winding:
and performing double closed-loop control on the rectifier submodule by taking the direct-current side voltage of the rectifier submodule as an outer-loop control quantity and taking the current as an inner-loop control quantity, and performing double closed-loop control on the inverter submodule by taking the alternating-current side voltage of the inverter submodule as an outer-loop control quantity and taking the current as an inner-loop control quantity to realize electric energy conversion on the winding voltage of the split winding.
7. The split-winding on-load tap changer of claim 1, wherein the three-phase on-load tap changing devices are connected to a power supply line of a power grid after being connected in a delta connection manner or a star connection manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111509657.7A CN114171307B (en) | 2021-12-10 | 2021-12-10 | Split winding type on-load voltage regulating transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111509657.7A CN114171307B (en) | 2021-12-10 | 2021-12-10 | Split winding type on-load voltage regulating transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114171307A true CN114171307A (en) | 2022-03-11 |
| CN114171307B CN114171307B (en) | 2024-08-09 |
Family
ID=80485547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111509657.7A Active CN114171307B (en) | 2021-12-10 | 2021-12-10 | Split winding type on-load voltage regulating transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114171307B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115173426A (en) * | 2022-09-08 | 2022-10-11 | 国网智能电网研究院有限公司 | Voltage amplitude phase adjusting device and adjusting method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2100897C1 (en) * | 1996-10-01 | 1997-12-27 | Челябинский государственный технический университет | Control method for multiphase compensated rectifier set |
| CN101968993A (en) * | 2010-07-16 | 2011-02-09 | 江苏上能变压器有限公司 | 220 kilovolt grade low-voltage winding split on-load voltage-regulating wind power transformer |
| CN106330032A (en) * | 2016-09-23 | 2017-01-11 | 国网江苏省电力公司南京供电公司 | Multi-stage on-load automatic voltage adjustment power distribution transformer |
| CN112103953A (en) * | 2020-09-11 | 2020-12-18 | 西安交通大学 | Stepless voltage regulation distribution transformer based on bidirectional controllable switch and voltage regulation method |
-
2021
- 2021-12-10 CN CN202111509657.7A patent/CN114171307B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2100897C1 (en) * | 1996-10-01 | 1997-12-27 | Челябинский государственный технический университет | Control method for multiphase compensated rectifier set |
| CN101968993A (en) * | 2010-07-16 | 2011-02-09 | 江苏上能变压器有限公司 | 220 kilovolt grade low-voltage winding split on-load voltage-regulating wind power transformer |
| CN106330032A (en) * | 2016-09-23 | 2017-01-11 | 国网江苏省电力公司南京供电公司 | Multi-stage on-load automatic voltage adjustment power distribution transformer |
| CN112103953A (en) * | 2020-09-11 | 2020-12-18 | 西安交通大学 | Stepless voltage regulation distribution transformer based on bidirectional controllable switch and voltage regulation method |
Non-Patent Citations (1)
| Title |
|---|
| 李震: "无触点无级有载调压装置的运行误差自动检测方法", 《自动化仪表仪器》, 31 January 2021 (2021-01-31), pages 1 - 4 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115173426A (en) * | 2022-09-08 | 2022-10-11 | 国网智能电网研究院有限公司 | Voltage amplitude phase adjusting device and adjusting method |
| WO2024051838A1 (en) * | 2022-09-08 | 2024-03-14 | 国网智能电网研究院有限公司 | Voltage amplitude and phase adjustment apparatus and method, and computer device and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114171307B (en) | 2024-08-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101553977B (en) | Device for converting an electric current | |
| US5969511A (en) | Method and device for continuous adjustment and regulation of transformer turns ratio, and transformer provided with such device | |
| Mohr et al. | Converter systems for fuel cells in the medium power range—A comparative study | |
| US9800161B2 (en) | Power converters | |
| US9344004B2 (en) | Power conversion system | |
| US6977449B2 (en) | Frequency converter and drive for electric motor | |
| EP3072229B1 (en) | Soft switching inverter | |
| KR20170035959A (en) | DC-DC converter having a transformer and DC network having a DC-DC converter and method to operate a DC network | |
| US20160146192A1 (en) | Wind turbine power conversion system | |
| CN110289774B (en) | High-voltage direct-current transmission converter unit and control method and control device thereof | |
| US20200350836A1 (en) | Modular multipoint power converter and method of operating it | |
| EP3925064A1 (en) | Boost converter and control method | |
| CN114171307B (en) | Split winding type on-load voltage regulating transformer | |
| KR100934334B1 (en) | Heating power unit | |
| CN112952791B (en) | DC power flow controller | |
| CN106972802A (en) | The method and apparatus of controlled motor drive system DC bus-bar voltage | |
| Kjaer et al. | A primary-switched line-side converter using zero-voltage switching | |
| CN114171306B (en) | Non-isolated energy-taking on-load voltage regulating transformer | |
| EP2840699A2 (en) | Multilevel converter system | |
| WO2014085591A2 (en) | Power conversion | |
| JP2022133822A (en) | Power conversion circuit and power conversion device | |
| CN110995018A (en) | Topological structure based on different arrangement of bidirectional H-bridges | |
| CN111800060B (en) | PFC-containing motor driving circuit and control method thereof | |
| RU2740490C1 (en) | Device for stabilization of three-phase sinusoidal voltage with link of increased frequency | |
| US20240048070A1 (en) | Power converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |