CN116526498A - Transformer hybrid voltage regulating system, control method and storage medium - Google Patents

Transformer hybrid voltage regulating system, control method and storage medium Download PDF

Info

Publication number
CN116526498A
CN116526498A CN202310297312.2A CN202310297312A CN116526498A CN 116526498 A CN116526498 A CN 116526498A CN 202310297312 A CN202310297312 A CN 202310297312A CN 116526498 A CN116526498 A CN 116526498A
Authority
CN
China
Prior art keywords
voltage
transistor
transformer
controller
load
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.)
Pending
Application number
CN202310297312.2A
Other languages
Chinese (zh)
Inventor
刘水
钟振鑫
陈鸣
张大兴
唐伟华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Power Grid Co Ltd
Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Original Assignee
Guangdong Power Grid Co Ltd
Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Guangdong Power Grid Co Ltd, Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd filed Critical Guangdong Power Grid Co Ltd
Priority to CN202310297312.2A priority Critical patent/CN116526498A/en
Publication of CN116526498A publication Critical patent/CN116526498A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The embodiment of the invention discloses a transformer hybrid voltage regulating system, a control method and a storage medium. The transformer hybrid voltage regulating system comprises: a first transformer, a power electronic converter, and a controller; the primary side of the first transformer comprises three-phase main windings, each phase of main winding comprises a plurality of sectional windings and a plurality of voltage regulating switches, the two ends of each sectional winding are connected with three voltage regulating switches in series, and the adjacent sectional windings share one voltage regulating switch; the three groups of main windings adopt a Y connection mode or a delta connection mode; the secondary side of the first transformer comprises a three-phase auxiliary winding and a three-phase auxiliary winding; the first end of each phase of auxiliary winding is connected, and the second end of each auxiliary winding is connected with the input end of the power electronic converter; the first end of each phase auxiliary winding, the output end of the power electronic converter and the load are connected in series, and the second end of each phase auxiliary winding is connected. The scheme can realize accurate regulation of the output voltage of the transformer and provide reactive power for the load.

Description

Transformer hybrid voltage regulating system, control method and storage medium
Technical Field
The embodiment of the invention relates to the technical field of transformers, in particular to a transformer hybrid voltage regulating system, a control method and a storage medium.
Background
The connectors on the on-load voltage regulator in the prior art are only several or more than ten, so that the voltage of the on-load voltage regulating transformer can be regulated according to a certain discrete step size, waveform transition is not smooth enough, stepless voltage regulation cannot be realized, and the regulation precision is low. The transformer tap is subject to its mechanical characteristics, and there is a certain time delay in the tap operation, the voltage regulation response time is long, and the number of operations is limited, so reactive power cannot be supplied to the system.
Disclosure of Invention
The embodiment of the invention provides a transformer hybrid voltage regulating system, a control method and a storage medium, which are used for realizing accurate regulation of transformer output voltage and providing reactive power for a load.
In a first aspect, an embodiment of the present invention provides a hybrid voltage regulating system for a transformer, including: a first transformer, a power electronic converter, and a controller;
the primary side of the first transformer comprises three-phase main windings, each phase of main winding comprises a first winding, a plurality of sectional windings and a plurality of voltage regulating switches, the first winding and the sectional windings are connected in series, two ends of each sectional winding are connected in parallel with three voltage regulating switches connected in series, and adjacent sectional windings share one voltage regulating switch; the three groups of main windings adopt a Y connection mode or a delta connection mode;
The secondary side of the first transformer comprises a three-phase auxiliary winding and a three-phase auxiliary winding; the first end of each auxiliary winding is connected with the first end of each phase, the second end of each auxiliary winding is connected with the input end of the power electronic converter, and the auxiliary windings are used for supplying power to the power electronic converter; the first end of the auxiliary winding of each phase, the output end of the power electronic converter and the load are connected in series, and the second end of the auxiliary winding of each phase is connected;
the controller is connected with the load and is used for collecting load voltage; the controller is connected with the voltage regulating switch and is used for controlling the voltage regulating switch to regulate the output voltage of the first transformer according to the load voltage; the controller is connected with the power electronic converter and is used for adjusting the output voltage of the power electronic converter according to the load voltage so as to adjust the voltage and reactive power provided to the load.
Optionally, the power electronic converter comprises a first input module, a first output module, three first storage modules and a second transformer;
the first input module comprises three first bridge arms and three first inductors which are connected in parallel, the first bridge arms comprise two first switching tubes which are connected in series, the interconnection point of the two first switching tubes of each first bridge arm is connected with a first end of one first inductor, a second end of the first inductor is used as an input end of the power electronic converter, and a control end of the first switching tube is connected with the controller;
The first output module comprises four second bridge arms and four second inductors which are connected in parallel, and the first bridge arm is connected with the second bridge arms in parallel;
the second bridge arm comprises two second switching tubes connected in series, the interconnection point of the two second switching tubes of each second bridge arm is connected with the first end of one second inductor, the second ends of any three second inductors are respectively connected with the first end of one first storage module and the input end of the second transformer, the second ends of the remaining second inductors, the second ends of three first storage modules and the input end of the second transformer are connected, and the control end of the second switching tube is connected with the controller.
Optionally, the first switching tube comprises a first transistor;
a first pole of a first transistor is used as a first end of the first bridge arm, a second pole of the first transistor is connected with a first pole of a second transistor, a second pole of the second transistor is used as a second end of the first bridge arm, and a control end of the first transistor is used as a control end of the first switch tube;
the second switching transistor includes a second transistor;
A first pole of a first second transistor is used as a first end of the second bridge arm, a second pole of the first second transistor is connected with a first pole of a second transistor, a second pole of the second transistor is used as a second end of the second bridge arm, and a control end of the second transistor is used as a control end of the second switching tube;
the first storage module comprises a first capacitor;
the first end of the first capacitor is used as the first end of the first memory module, and the second end of the first capacitor is used as the second end of the first memory module.
Optionally, the power electronic converter includes a second input module and three second output modules;
the second input module comprises three third bridge arms and three third inductors which are connected in parallel, the third bridge arms comprise two third switching tubes which are connected in series, the interconnection point of the two third switching tubes of each third bridge arm is connected with the first end of one third inductor, the second end of the third inductor is used as the input end of the power electronic converter, and the control end of the third switching tube is connected with the controller;
the second output module comprises two fourth bridge arms, a fourth inductor, a second storage module and a third transformer which are connected in parallel, wherein each fourth bridge arm comprises two fourth switching tubes which are connected in series, the interconnection point of each of the two fourth switching tubes of one fourth bridge arm is connected with the first end of each fourth inductor, the second end of each fourth inductor, the first end of each second storage module and the input end of the third transformer are connected, the interconnection point of each of the two fourth switching tubes of the other fourth bridge arm, the second end of each second storage module and the input end of the third transformer are connected, and the control end of each fourth switching tube is connected with the controller;
And the fourth bridge arms of the different second output modules are connected in parallel.
Optionally, the third switching transistor includes a third transistor;
a first pole of a first third transistor is used as a first end of the third bridge arm, a second pole of the first third transistor is connected with a first pole of a second third transistor, a second pole of the second third transistor is used as a second end of the third bridge arm, and a control end of the third transistor is used as a control end of the third switching tube;
the fourth switching transistor comprises a fourth transistor;
a first pole of a first fourth transistor is used as a first end of the fourth bridge arm, a second pole of the first fourth transistor is connected with a first pole of a second fourth transistor, a second pole of the second fourth transistor is used as a second end of the fourth bridge arm, and a control end of the fourth transistor is used as a control end of the fourth switching tube;
the second storage module comprises a second capacitor;
the first end of the second capacitor is used as the first end of the second memory module, and the second end of the second capacitor is used as the second end of the second memory module.
In a second aspect, an embodiment of the present invention further provides a control method for a hybrid voltage regulating system of a transformer, where the control method for the hybrid voltage regulating system of the transformer provided by any embodiment of the present invention is implemented by using the hybrid voltage regulating system of a transformer, and the control method for the hybrid voltage regulating system of a transformer includes:
the controller collects the load voltage;
the controller controls the voltage regulating switch to regulate the output voltage of the first transformer according to the load voltage;
the controller adjusts the power electronic converter output voltage according to the load voltage to adjust the voltage and reactive power provided to the load.
Optionally, the controller controlling the voltage regulating switch to regulate the first transformer output voltage according to the load voltage includes:
the controller calculates a voltage amplitude difference according to the load voltage and the target voltage;
the controller generates an on-load voltage-regulating tapping switch instruction according to the voltage amplitude difference;
and the controller controls the voltage regulating switch to regulate the output voltage of the first transformer according to the on-load voltage regulating tapping switch instruction.
Optionally, the controller adjusts the power electronic converter output voltage according to the load voltage to adjust the voltage and reactive power provided to the load, including:
The controller calculates a voltage phase angle difference according to the load voltage and the target voltage;
the controller calculates preset output voltage of the power electronic converter according to the voltage phase angle difference;
the controller generates a pulse signal according to the preset output voltage and the on-load voltage-regulating tap switch instruction, and sends the pulse signal to the power electronic converter;
and the power electronic converter regulates output voltage and reactive power according to the pulse signal.
Optionally, the controller generates a pulse signal according to the preset output voltage and the on-load voltage-regulating tap switch command, including:
the controller generates phase fundamental wave voltage, positive sequence voltage and negative sequence voltage according to the preset output voltage and the on-load voltage-regulating tap switch instruction;
the controller integrates the phase fundamental voltage, the positive sequence voltage and the negative sequence voltage into a pulse signal.
In a third aspect, an embodiment of the present invention further provides a computer readable storage medium storing a computer program, where the computer program when executed by a processor implements the method for controlling a hybrid voltage regulation system of a transformer provided by any embodiment of the present invention.
According to the embodiment of the invention, the load voltage is collected through the controller so as to determine the voltage value which needs to be adjusted. Therefore, the controller can control the voltage regulating switch to roughly regulate the output voltage of the first transformer according to the load voltage, and the controller can accurately regulate the output voltage of the power electronic converter according to the load voltage, so that the voltage output by the first transformer and the power electronic converter to the load is equal to the target voltage required to be regulated, continuous regulation of the load voltage is realized, and the accuracy of regulation of the load voltage is improved. In addition, the power electronic converter can change the load voltage direction, so that the load current direction is changed, and the voltage direction output by the power grid end is different from the load current direction, so that a certain reactive power is provided for the load.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a hybrid voltage regulating system of a transformer according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another hybrid voltage regulating system for a transformer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power electronic converter according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another power electronic converter according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a control method of a hybrid voltage regulating system of a transformer according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a composite control voltage vector of a transformer hybrid voltage regulating system according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a method for controlling a voltage regulating switch to regulate an output voltage of a first transformer according to a load voltage by a controller according to an embodiment of the present invention;
FIG. 8 is a schematic flow chart of a method for a controller to regulate voltage and reactive power supplied to a load according to an embodiment of the present invention;
fig. 9 is a flowchart of a method for generating a pulse signal by a controller according to a preset output voltage and an on-load tap changer command according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
An embodiment of the invention provides a transformer hybrid voltage regulating system, fig. 1 is a schematic structural diagram of the transformer hybrid voltage regulating system provided by the embodiment of the invention, and fig. 2 is a schematic structural diagram of another transformer hybrid voltage regulating system provided by the embodiment of the invention. As shown in fig. 1 and 2, the transformer hybrid voltage regulating system includes: a first transformer 100, a power electronic converter 200, and a controller 300; the primary side of the first transformer 100 comprises three-phase main windings 110, each phase main winding 110 comprises a first winding R1, a plurality of segmented windings R2 and a plurality of voltage regulating switches K, the first winding R1 and the segmented windings R2 are connected in series, two ends of each segmented winding R2 are connected in parallel with three voltage regulating switches K connected in series, and the adjacent segmented windings R2 share one voltage regulating switch K; the three groups of main windings 110 are connected in a Y connection mode or a delta connection mode; the secondary side of the first transformer 100 includes a three-phase auxiliary winding R3 and a three-phase auxiliary winding R4; a first end of each phase of auxiliary winding R4 is connected, a second end of each auxiliary winding R4 is connected with an input end of the power electronic converter 200, and the auxiliary windings R4 are used for supplying power to the power electronic converter 200; the first end of each phase auxiliary winding R3, the output end of the power electronic converter 200 and the load 400 are connected in series, and the second end of each phase auxiliary winding R3 is connected; the controller 300 is connected with the load 400, and the controller 300 is used for collecting load voltage; the controller 300 is connected with the voltage regulating switch K, and the controller 300 is used for controlling the voltage regulating switch K to regulate the output voltage of the first transformer 100 according to the load voltage; the controller 300 is connected to the power electronic converter 200, and the controller 300 is configured to regulate the output voltage of the power electronic converter 200 according to the load voltage, so as to regulate the voltage and reactive power provided to the load 400.
Specifically, in fig. 1, the primary-side main winding 110 is connected in a Y-connection manner, that is, the first ends of the main windings 110 are respectively connected to three phases of an external power source, and the second ends of the main windings 110 are respectively connected. In fig. 2, the primary side main windings 110 are connected in a delta connection manner, that is, the first ends of the main windings 110 are respectively connected with three phases of an external power supply, and the main windings 110 are connected in a tail-end manner.
The hybrid voltage regulating system of the transformer applies the power electronic conversion technology to the on-load voltage regulating technology, and performs fixed step adjustment (rough adjustment) on the output voltage of the transformer through the voltage regulating switch K, and compensates (fine adjustment) the voltage output to the load 400 through the power electronic converter 200. In addition, the power electronic converter 200 can change the load voltage phase and the negative current phase through voltage vector phase angle control, thereby changing the load current and the power grid voltage direction, and further realizing the reactive power supply to the load 400.
According to the connection relation of the transformer hybrid voltage regulating system, the working principle of the transformer hybrid voltage regulating system is as follows: the sum of the voltage output by the secondary winding R3 of the first transformer 100 and the voltage output by the power electronic converter 200 is the voltage that the load 400 needs to regulate. The controller 300 collects load voltage, controls the on or off of the voltage regulating switch K according to the load voltage, changes the number of the segmented windings R2 connected in series with the first winding R1, and changes the overall total number of turns of the main winding 110, so that the turn ratio of the main winding 110 to the auxiliary winding R3 is changed, and further, the output voltage of the first transformer 100 is regulated to perform fixed step regulation. At the same time, the controller 300 adjusts the output voltage of the power electronic converter 200 according to the load voltage, so as to compensate the load voltage. Therefore, continuous adjustment of the load voltage can be realized, and the accuracy of the adjustment of the load voltage is improved. In addition, the power electronic converter 200 can change the load voltage direction, so as to change the load current direction, so that the voltage direction output by the power grid end is different from the load current direction, and a certain reactive power is provided for the load 400.
The embodiment of the invention collects the load voltage through the controller 300 to determine the voltage value which needs to be adjusted. Therefore, the controller 300 can control the voltage regulating switch K to roughly regulate the output voltage of the first transformer 100 according to the load voltage, and the controller 300 can precisely regulate the output voltage of the power electronic converter 200 according to the load voltage, so that the voltages output by the first transformer 100 and the power electronic converter 200 to the load 400 are equal to the target voltage to be regulated, thereby realizing continuous regulation of the load voltage and improving the accuracy of regulation of the load voltage. In addition, the power electronic converter 200 may change the load voltage direction, thereby changing the load current direction, so that the voltage direction output by the grid end is different from the load current direction, and thus a certain reactive power is provided to the load 400.
Fig. 3 is a schematic structural diagram of a power electronic converter according to an embodiment of the present invention, and as shown in fig. 3, a power electronic converter 200 includes a first input module 210, a first output module 220, three first storage modules 230, and a second transformer 240; the first input module 210 comprises three parallel first bridge arms 211 and three first inductors L1, the first bridge arms 211 comprise two first switching tubes connected in series, interconnection points of the two first switching tubes of each first bridge arm 211 are connected with a first end of one first inductor L1, a second end of the first inductor L1 is used as an input end of the power electronic converter 200, and a control end of the first switching tube is connected with a controller; the first output module 220 includes four parallel second bridge arms 221 and four second inductors L2, and the first bridge arm 211 is parallel to the second bridge arms 221; the second bridge arm 221 includes two second switching tubes connected in series, the interconnection point of the two second switching tubes of each second bridge arm 221 is connected with the first end of a second inductor L2, the second ends of any three second inductors L2 are respectively connected with the first end of a first storage module 230 and the input end of a second transformer 240, the second ends of the remaining second inductors L2, the second ends of three first storage modules 230 and the input end of the second transformer 240 are connected, and the control end of the second switching tube is connected with the controller.
The first switching tube comprises a first transistor T1; the first pole of the first transistor T1 is used as the first end of the first bridge arm 211, the second pole of the first transistor T1 is connected with the first pole of the second first transistor T1, the second pole of the second first transistor T1 is used as the second end of the first bridge arm 211, and the control end of the first transistor T1 is used as the control end of the first switch tube; the second switching tube comprises a second transistor T2; the first pole of the first second transistor T2 is used as the first end of the second bridge arm 221, the second pole of the first second transistor T2 is connected with the first pole of the second transistor T2, the second pole of the second transistor T2 is used as the second end of the second bridge arm 221, and the control end of the second transistor T2 is used as the control end of the second switch tube; the first memory module 230 includes a first capacitor C1; the first end of the first capacitor C1 serves as the first end of the first memory module 230, and the second end of the first capacitor C1 serves as the second end of the first memory module 230.
As shown in fig. 3, the power electronic converter 200 adopts a three-phase back-to-back voltage source type topology, and the first input module 210 of the power electronic converter 200 is connected to the three-phase auxiliary winding R4, that is, each first bridge arm 211 on the left side is correspondingly connected to the three-phase auxiliary winding R4 through a first inductor L1. The controller rectifies the voltage input from the auxiliary winding R4 by controlling the on state of the first transistor T1, i.e., controls the input voltage to a desired voltage value. The first output module 220 adopts an inversion structure of the three-phase four-wire power electronic converter 200. The neutral points of any three second bridge arms 221 are connected to the second transformer 240 through a filter circuit formed by the second inductor L2 and the first capacitor C1. The controller can adjust the output voltage of the power electronic converter 200 by controlling the on state of the second transistor T2, i.e. the amplitude and phase angle of the output voltage of the power electronic converter 200 can be adjusted.
Fig. 4 is a schematic structural diagram of another power electronic converter according to an embodiment of the present invention, and as shown in fig. 4, the power electronic converter 200 includes a second input module 250 and three second output modules 260; the second input module 250 includes three third bridge arms 251 and three third inductors L3 connected in parallel, the third bridge arms 251 include two third switching tubes connected in series, an interconnection point of the two third switching tubes of each third bridge arm 251 is connected with a first end of a third inductor L3, a second end of the third inductor L3 is used as an input end of the power electronic converter 200, and a control end of the third switching tube is connected with the controller; the second output module 260 includes two parallel fourth bridge arms 261, a fourth inductor L4, a second storage module 262 and a third transformer 263, the fourth bridge arms 261 include two fourth switching tubes connected in series, an interconnection point of the two fourth switching tubes of one fourth bridge arm 261 is connected with a first end of the fourth inductor L4, a second end of the fourth inductor L4, a first end of the second storage module 262 and an input end of the third transformer 263, an interconnection point of the two fourth switching tubes of the other fourth bridge arm 261, a second end of the second storage module 262 and an input end of the third transformer 263 are connected, and a control end of the fourth switching tube is connected with the controller; the fourth leg 261 of the different second output module 260 is connected in parallel.
The third switching tube comprises a third transistor T3; the first pole of the first third transistor T3 is used as the first end of the third bridge arm 251, the second pole of the first third transistor T3 is connected with the first pole of the second third transistor T3, the second pole of the second third transistor T3 is used as the second end of the third bridge arm 251, and the control end of the third transistor T3 is used as the control end of the third switch tube; the fourth switching transistor comprises a fourth transistor T4; the first pole of the first fourth transistor T4 is used as the first end of the fourth bridge arm 261, the second pole of the first fourth transistor T4 is connected with the first pole of the second fourth transistor T4, the second pole of the second fourth transistor T4 is used as the second end of the fourth bridge arm 261, and the control end of the fourth transistor T4 is used as the control end of the fourth switching tube; the second memory module 262 includes a second capacitor C2; the first end of the second capacitor C2 serves as the first end of the second memory module 262, and the second end of the second capacitor C2 serves as the second end of the second memory module 262.
As shown in fig. 4, the second input module 250 of the power electronic converter 200 is connected to the three-phase auxiliary winding R4, that is, each third leg 251 on the left side is connected to the three-phase auxiliary winding R4 through a third inductance L3. The controller rectifies the voltage input from the auxiliary winding R4 by controlling the on state of the third transistor T3, i.e., controls the input voltage to a desired voltage value. The output in fig. 4 adopts the second output modules 260 of the H-bridge topology structure of three common dc buses, and each second output module 260 is connected with the third transformer 263 as the output of the power electronic converter 200 after passing through the filter circuit formed by the fourth inductor L4 and the second capacitor C2. The controller can adjust the output voltage of the power electronic converter 200 by controlling the on state of the fourth transistor T4, i.e. adjust the amplitude and phase angle of the output voltage of the power electronic converter 200.
Referring to fig. 3 and 4, the three-phase conversion of the structure of the power electronic converter 200 of fig. 4 is more independent with respect to the structure of the power electronic converter 200 of fig. 3, and the switching frequency of the fourth transistor T4 is higher than the switching frequency of the third transistor T3, whereby the structure of the power electronic converter 200 of fig. 4 can optimize the capacity and volume of the filter circuit composed of the fourth inductance L4 and the second capacitance C2. In addition, when the dc bus voltages are the same, the power electronic converter 200 of fig. 4 has a larger output voltage amplitude adjustment range than the power electronic converter 200 of fig. 3, which contributes to an improvement in the compensation range of the power electronic converter 200.
Fig. 5 is a schematic flow chart of a control method of a hybrid voltage regulating system of a transformer according to an embodiment of the present invention, where the control method of the hybrid voltage regulating system of the transformer is implemented by using the hybrid voltage regulating system of the transformer according to any embodiment of the present invention. The control method of the transformer hybrid voltage regulating system comprises the following steps:
s10, the controller collects load voltage.
The controller is connected with the load, so that the controller can monitor the change of the load voltage in real time and collect the load voltage.
And S11, the controller controls the voltage regulating switch to regulate the output voltage of the first transformer according to the load voltage.
After the controller collects the load voltage, the difference value between the current load voltage and the target voltage to be regulated can be obtained, and then a regulating signal can be generated according to the difference value between the current load voltage and the target voltage to be regulated so as to control the conducting state of the voltage regulating switch, the number of segmented windings connected with the first winding in series is changed, the total number of turns of the main winding is changed, the turn ratio of the main winding and the auxiliary winding is changed, and further the output voltage of the first transformer is regulated to carry out fixed step regulation.
And S12, the controller adjusts the output voltage of the power electronic converter according to the load voltage so as to adjust the voltage and reactive power provided to the load.
The sum of the voltage output by the secondary winding of the first transformer and the voltage output by the power electronic converter is the target voltage required to be regulated by the load. The controller generates an adjusting signal according to the difference value between the current load voltage and the target voltage to be adjusted, and compensates the load voltage. Therefore, continuous adjustment of the load voltage can be realized, and the accuracy of the adjustment of the load voltage is improved. In addition, the power electronic converter can change the load voltage direction, so that the load current direction is changed, the voltage direction output by the power grid end is different from the load current direction, and the purpose of providing a certain reactive power for the load is achieved.
Fig. 6 is a schematic diagram of a composite control voltage vector of a hybrid voltage regulating system of a transformer according to an embodiment of the present invention. As shown in FIG. 6, u s For outputting voltage for three-phase secondary winding, u vsc1 For the series output voltage of the power electronic converter and the three-phase auxiliary winding, u max Maximum voltage which can be output for the series connection of the power electronic converter and the three-phase auxiliary winding, u 0 Is the load voltage. As can be seen from the voltage vector relationship in FIG. 7, the voltage u 0 Can be continuously adjustable within the circle range, thereby realizing the accurate adjustment of load voltage and realizing the stable operation of the output voltage of the transformer.
On the basis of the foregoing embodiments, fig. 7 is a schematic flow chart of a method for controlling a voltage regulating switch to regulate an output voltage of a first transformer by a controller according to a load voltage according to the embodiment of the present invention, and as shown in fig. 7, the method for controlling the voltage regulating switch to regulate the output voltage of the first transformer by the controller according to the load voltage includes:
and S20, the controller calculates a voltage amplitude difference according to the load voltage and the target voltage.
Wherein the difference between the magnitude of the load voltage and the magnitude of the target voltage is equal to the voltage magnitude difference.
S21, the controller generates an on-load voltage-regulating tapping switch instruction according to the voltage amplitude difference.
The controller generates a signal capable of controlling the on state of the voltage regulating switch according to the voltage amplitude difference, namely an on-load voltage regulating tapping switch instruction.
S22, the controller controls the voltage regulating switch to regulate the output voltage of the first transformer according to the on-load voltage regulating tapping switch instruction.
The controller controls the conduction state of the voltage regulating switch according to the on-load voltage regulating tapping switch instruction so as to change the number of segmented windings connected in series with the first winding and change the overall total number of turns of the main winding, thereby changing the turn ratio of the main winding and the auxiliary winding and further realizing the adjustment of the output voltage of the first transformer to carry out fixed step adjustment.
Exemplary, on the basis of the foregoing embodiment, fig. 8 is a schematic flow chart of a method for adjusting voltage and reactive power provided to a load by a controller according to an embodiment of the present invention, where, as shown in fig. 8, the method for adjusting voltage and reactive power provided to the load by the controller includes:
and S30, the controller calculates a voltage phase angle difference according to the load voltage and the target voltage.
Wherein the difference between the phase of the load voltage and the phase of the target voltage is equal to the voltage phase angle difference.
And S31, the controller calculates preset output voltage of the power electronic converter according to the voltage phase angle difference.
And S32, the controller generates a pulse signal according to the preset output voltage and the on-load voltage-regulating tapping switch instruction, and sends the pulse signal to the power electronic converter.
And S33, the power electronic converter regulates output voltage and reactive power according to the pulse signals.
On the basis of the above embodiments, fig. 9 is a schematic flow chart of a method for generating a pulse signal by a controller according to a preset output voltage and an on-load tap changer command according to an embodiment of the present invention, where the method includes:
and S40, the controller generates phase fundamental wave voltage, positive sequence voltage and negative sequence voltage according to the preset output voltage and the on-load voltage-regulating tap switch command.
S41, integrating the controller into a pulse signal according to the phase fundamental wave voltage, the positive sequence voltage and the negative sequence voltage.
Embodiments of the present invention also provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method as provided by any of the embodiments of the present invention.
The computer storage media of embodiments of the invention may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium may be, for example, but not limited to: an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. Computer-readable storage media include (a non-exhaustive list): an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access Memory (Random Access Memory, RAM), a Read-Only Memory (ROM), an erasable programmable Read-Only Memory (electrically erasable, programmable Read-Only Memory, EPROM), a flash Memory, an optical fiber, a portable compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, with computer readable program code embodied in the data signal. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, radio Frequency (RF), etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++, ruby, go and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a local area network (Local Area Network, LAN) or a wide area network (Wide Area Network, WAN), or may be connected to an external computer, for example, through the internet using an internet service provider.
It will be appreciated by those skilled in the art that the term user terminal encompasses any suitable type of wireless user equipment, such as a mobile telephone, a portable data processing device, a portable web browser or a car mobile station.
In general, the various embodiments of the invention may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
Embodiments of the invention may be implemented by a data processor of a mobile device executing computer program instructions, e.g. in a processor entity, either in hardware, or in a combination of software and hardware. The computer program instructions may be assembly instructions, instruction set architecture (Instruction Set Architecture, ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages.
The block diagrams of any of the logic flows in the figures of this invention may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program may be stored on a memory. The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read Only Memory (ROM), random Access Memory (RAM), optical storage devices and systems (digital versatile disk DVD or CD optical disk), etc. The computer readable medium may include a non-transitory storage medium. The data processor may be of any type suitable to the local technical environment, such as, but not limited to, general purpose computers, special purpose computers, microprocessors, digital signal processors (Digital Signal Processing, DSPs), application specific integrated circuits (Application Specific Integrated Circuit, ASICs), programmable logic devices (Field-Programmable Gate Array, FGPA), and processors based on a multi-core processor architecture.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A transformer hybrid voltage regulation system, comprising: a first transformer, a power electronic converter, and a controller;
the primary side of the first transformer comprises three-phase main windings, each phase of main winding comprises a first winding, a plurality of sectional windings and a plurality of voltage regulating switches, the first winding and the sectional windings are connected in series, two ends of each sectional winding are connected in parallel with three voltage regulating switches connected in series, and adjacent sectional windings share one voltage regulating switch; the three groups of main windings adopt a Y connection mode or a delta connection mode;
the secondary side of the first transformer comprises a three-phase auxiliary winding and a three-phase auxiliary winding; the first end of each auxiliary winding is connected with the first end of each phase, the second end of each auxiliary winding is connected with the input end of the power electronic converter, and the auxiliary windings are used for supplying power to the power electronic converter; the first end of the auxiliary winding of each phase, the output end of the power electronic converter and the load are connected in series, and the second end of the auxiliary winding of each phase is connected;
the controller is connected with the load and is used for collecting load voltage; the controller is connected with the voltage regulating switch and is used for controlling the voltage regulating switch to regulate the output voltage of the first transformer according to the load voltage; the controller is connected with the power electronic converter and is used for adjusting the output voltage of the power electronic converter according to the load voltage so as to adjust the voltage and reactive power provided to the load.
2. The transformer hybrid voltage regulation system of claim 1, wherein the power electronic converter comprises a first input module, a first output module, three first storage modules, and a second transformer;
the first input module comprises three first bridge arms and three first inductors which are connected in parallel, the first bridge arms comprise two first switching tubes which are connected in series, the interconnection point of the two first switching tubes of each first bridge arm is connected with a first end of one first inductor, a second end of the first inductor is used as an input end of the power electronic converter, and a control end of the first switching tube is connected with the controller;
the first output module comprises four second bridge arms and four second inductors which are connected in parallel, and the first bridge arm is connected with the second bridge arms in parallel;
the second bridge arm comprises two second switching tubes connected in series, the interconnection point of the two second switching tubes of each second bridge arm is connected with the first end of one second inductor, the second ends of any three second inductors are respectively connected with the first end of one first storage module and the input end of the second transformer, the second ends of the remaining second inductors, the second ends of three first storage modules and the input end of the second transformer are connected, and the control end of the second switching tube is connected with the controller.
3. The transformer hybrid voltage regulation system of claim 2, wherein the first switching tube comprises a first transistor;
a first pole of a first transistor is used as a first end of the first bridge arm, a second pole of the first transistor is connected with a first pole of a second transistor, a second pole of the second transistor is used as a second end of the first bridge arm, and a control end of the first transistor is used as a control end of the first switch tube;
the second switching transistor includes a second transistor;
a first pole of a first second transistor is used as a first end of the second bridge arm, a second pole of the first second transistor is connected with a first pole of a second transistor, a second pole of the second transistor is used as a second end of the second bridge arm, and a control end of the second transistor is used as a control end of the second switching tube;
the first storage module comprises a first capacitor;
the first end of the first capacitor is used as the first end of the first memory module, and the second end of the first capacitor is used as the second end of the first memory module.
4. The transformer hybrid voltage regulation system of claim 1, wherein the power electronic converter comprises a second input module and three second output modules;
the second input module comprises three third bridge arms and three third inductors which are connected in parallel, the third bridge arms comprise two third switching tubes which are connected in series, the interconnection point of the two third switching tubes of each third bridge arm is connected with the first end of one third inductor, the second end of the third inductor is used as the input end of the power electronic converter, and the control end of the third switching tube is connected with the controller;
the second output module comprises two fourth bridge arms, a fourth inductor, a second storage module and a third transformer which are connected in parallel, wherein each fourth bridge arm comprises two fourth switching tubes which are connected in series, the interconnection point of each of the two fourth switching tubes of one fourth bridge arm is connected with the first end of each fourth inductor, the second end of each fourth inductor, the first end of each second storage module and the input end of the third transformer are connected, the interconnection point of each of the two fourth switching tubes of the other fourth bridge arm, the second end of each second storage module and the input end of the third transformer are connected, and the control end of each fourth switching tube is connected with the controller;
And the fourth bridge arms of the different second output modules are connected in parallel.
5. The transformer hybrid voltage regulation system of claim 4, wherein the third switching tube comprises a third transistor;
a first pole of a first third transistor is used as a first end of the third bridge arm, a second pole of the first third transistor is connected with a first pole of a second third transistor, a second pole of the second third transistor is used as a second end of the third bridge arm, and a control end of the third transistor is used as a control end of the third switching tube;
the fourth switching transistor comprises a fourth transistor;
a first pole of a first fourth transistor is used as a first end of the fourth bridge arm, a second pole of the first fourth transistor is connected with a first pole of a second fourth transistor, a second pole of the second fourth transistor is used as a second end of the fourth bridge arm, and a control end of the fourth transistor is used as a control end of the fourth switching tube;
the second storage module comprises a second capacitor;
the first end of the second capacitor is used as the first end of the second memory module, and the second end of the second capacitor is used as the second end of the second memory module.
6. A control method of a transformer hybrid voltage regulating system, which is executed by the transformer hybrid voltage regulating system according to any one of claims 1 to 5, comprising:
the controller collects the load voltage;
the controller controls the voltage regulating switch to regulate the output voltage of the first transformer according to the load voltage;
the controller adjusts the power electronic converter output voltage according to the load voltage to adjust the voltage and reactive power provided to the load.
7. The method of claim 6, wherein the controller controlling the voltage regulating switch to regulate the first transformer output voltage according to the load voltage comprises:
the controller calculates a voltage amplitude difference according to the load voltage and the target voltage;
the controller generates an on-load voltage-regulating tapping switch instruction according to the voltage amplitude difference;
and the controller controls the voltage regulating switch to regulate the output voltage of the first transformer according to the on-load voltage regulating tapping switch instruction.
8. The method of claim 7, wherein the controller adjusts the power electronic converter output voltage according to the load voltage to adjust the voltage and reactive power provided to the load, comprising:
The controller calculates a voltage phase angle difference according to the load voltage and the target voltage;
the controller calculates preset output voltage of the power electronic converter according to the voltage phase angle difference;
the controller generates a pulse signal according to the preset output voltage and the on-load voltage-regulating tap switch instruction, and sends the pulse signal to the power electronic converter;
and the power electronic converter regulates output voltage and reactive power according to the pulse signal.
9. The method of claim 8, wherein the controller generates a pulse signal according to the preset output voltage and the on-load tap changer command, comprising:
the controller generates phase fundamental wave voltage, positive sequence voltage and negative sequence voltage according to the preset output voltage and the on-load voltage-regulating tap switch instruction;
the controller integrates the phase fundamental voltage, the positive sequence voltage and the negative sequence voltage into a pulse signal.
10. A computer readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the method of controlling a hybrid transformer voltage regulator system according to any one of claims 6-9.
CN202310297312.2A 2023-03-23 2023-03-23 Transformer hybrid voltage regulating system, control method and storage medium Pending CN116526498A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310297312.2A CN116526498A (en) 2023-03-23 2023-03-23 Transformer hybrid voltage regulating system, control method and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310297312.2A CN116526498A (en) 2023-03-23 2023-03-23 Transformer hybrid voltage regulating system, control method and storage medium

Publications (1)

Publication Number Publication Date
CN116526498A true CN116526498A (en) 2023-08-01

Family

ID=87391086

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310297312.2A Pending CN116526498A (en) 2023-03-23 2023-03-23 Transformer hybrid voltage regulating system, control method and storage medium

Country Status (1)

Country Link
CN (1) CN116526498A (en)

Similar Documents

Publication Publication Date Title
Chen et al. Moving discretized control set model-predictive control for dual-active bridge with the triple-phase shift
Quevedo et al. Model predictive control of an AFE rectifier with dynamic references
Shah et al. Paralleling of LLC resonant converters
WO2020147193A1 (en) Dc-side inertia enhancement control method for island diesel-storage hybrid power supply system
Jeung et al. Robust voltage control of dual active bridge DC-DC converters using sliding mode control
US11888410B1 (en) Symmetric hybrid converters
CN110212800B (en) Modular multilevel converter universal control method based on model predictive control
US20160197556A1 (en) System and Method for LLC Converter Design
RU2711537C1 (en) Static reactive power compensator
Tiwary et al. Sliding mode and current observer‐based direct power control of dual active bridge converter with constant power load
CN110768536A (en) Double-active-bridge circuit loss control method
Tu et al. Research of the high supply voltage quality control for solid‐state transformer
Segundo‐Ramírez et al. Stability boundary analysis of the dynamic voltage restorer in weak systems with dynamic loads
Cobreces et al. Hysteretic control of grid-side current for a single-phase LCL grid-connected voltage source converter
CN116015074B (en) High-precision semiconductor test power supply multi-output control method and system
Almaguer et al. A frequency-based LCL filter design and control considerations for three-phase converters for solid-state transformer applications
CN116526498A (en) Transformer hybrid voltage regulating system, control method and storage medium
Park et al. Novel current slope control in dual-active-bridge converter using periodic filters and direct access memory in DSP
KR101848903B1 (en) Sliding mode controller for dual active bridge converter
CN113852067B (en) Method, system, storage medium and equipment for controlling seamless switching between off-grid and on-grid
Li et al. Perturbation Observation Method-Based Optimization Seeking Control of Soft-Switching and No Backflow Power for LCL Resonant-Type Dual Active Bridge DC–DC Converters
Abramov et al. Analysis and design of post-regulation stages for resonant capacitively-coupled wireless power systems
Dai Modeling and efficiency-based control of interleaved LLC converters for PV DC microgrid
CN115118161A (en) Neutral point voltage balance control method and device for three-level bidirectional converter
Jakka et al. Three‐winding transformer based asymmetrical dual active bridge 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