CN207010241U - A kind of hybrid power electronic transformer of unified power quality controlling - Google Patents

A kind of hybrid power electronic transformer of unified power quality controlling Download PDF

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Publication number
CN207010241U
CN207010241U CN201720494769.2U CN201720494769U CN207010241U CN 207010241 U CN207010241 U CN 207010241U CN 201720494769 U CN201720494769 U CN 201720494769U CN 207010241 U CN207010241 U CN 207010241U
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transformer
power
unit
voltage
series
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刘君
曾华荣
陈沛龙
肖永
马晓红
杨涛
张迅
曾鹏
杨斌
王建华
季振东
赵剑锋
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Electric Power Research Institute of Guizhou Power Grid Co Ltd
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Electric Power Research Institute of Guizhou Power Grid Co Ltd
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    • 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
    • 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
    • Y02E40/40—Arrangements for reducing harmonics

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Abstract

The utility model discloses a kind of hybrid power electronic transformer with unified power quality controlling function, the topology that the Power Quality Detection and control method are combined based on traditional transformer with electronic power convertor, and can be divided into such as lower part：Hardware circuit connects：It is made up of multiwinding transformer and electronic power convertor, wherein current transformer includes rectification unit, electric discharge/balanced loop unit, inversion unit and direct current output port;Power Quality Detection unit：By carrying out Park Transformation to three-phase voltage, and by carrying out inverse transformation after filter filtering, realize the detection of voltage harmonic and allocation of distortion;Voltage Stability Control：Gather voltage on line side and with the comparison of set-point, using PI regulation two close cycles designs, and by filter filtering, finally obtain the regulation voltage of input net side;The control of reactive power compensating：Decoupled by positive sequence, the synchronous of negative phase-sequence, double sequence Synchronization Controls, finally obtain reactive-load compensation amount.

Description

A kind of hybrid power electronic transformer of unified power quality controlling
Technical field
A kind of hybrid power electronic transformer of unified power quality controlling of the utility model design, belongs to power electronics Applied technical field in power system.
Background technology
Electric energy is a kind of most popular energy in modern society, and its level of application indicates a national developing water It is flat.With the rapid development of China's science and technology and national economy, the demand of electric energy is significantly increased people, while to electric energy matter The requirement more and more higher of amount.The quality of power supply is for the safety of power system and electrical equipment, economical operation, industrial production and product Quality and the maintenance equal important in inhibiting of normal life order.
At present, there is the characteristics of a series of new in power system：First, large-scale, ultra-large type power system starts to occur, such as The safe and stable operation of what guarantee large-scale power system is an outstanding problem；Second, renewable energy power generation technology obtained it is general All over concern, the power supply of power system is become diversified forms by traditional industrial frequency AC form and deposited, such as dc source（Photovoltaic is sent out Electricity）, AC frequency conversion power supply（Wind-power electricity generation）Deng, in these renewable energy systems, be directed to it is a series of it is high-power, Efficiently, the energy conversion and control problem of high quality；Third, nonlinear-load rapid development, under causing power quality continuous Drop, and a large amount of requirement of the sensitiveness load user to the quality of power supply about comes higher, causes power quality problem to become increasingly conspicuous.
Under background of the power system in face of these new challenges, the electric power as the most basic power transmission and transformation device of power system becomes Depressor, excessively single function cause it to be increasingly difficult to meet the requirement of modern power systems.Moreover, conventional electric power transformer Also have the disadvantage that, including：Volume, weight are big, and transformer insulation oil exists to environment to be threatened；Open circuit loss is higher, and bears Output voltage decline is easily caused during load；When load side breaks down, it is impossible to isolated fault, so as to cause failure propagation；With non-thread Property load when, distortion current enters power network by transformer coupled, and power network can be polluted；Mains side voltage is interfered When, load side can be delivered to again, cause the influence to sensitive load；Supporting relevant device is needed to protect it；In addition, During core sataration, harmonic wave can be produced, larger excitation surge current can be also caused when putting into power network.Therefore, it is how functionally right Power transformer is reformed, and realizes the leap again of transformer technology, meets it modern, or even Future Power System Various new demands are an of great value theoretical problems and put into practice problem, and numerous research workers face it is new Challenge.Therefore, since 20th century, domestic and foreign scholars all are being tried to explore to study novel electric power transformer.
The content of the invention
Purpose of utility model：For the topology and its key control technology of hybrid power electronic transformer, in topology, electricity Several aspects such as energy quality testing, Voltage Stability Control, the control of reactive power compensating are made that research.The purpose of this utility model is A kind of hybrid power electronic transformer with unified power quality controlling function is proposed, the mixed type transformer both has electricity The basic functions such as energy transmission, voltage conversion, have the new function of Power Quality Detection and improvement, the function is in New Topological again On the basis of, by PI double-loop control strategies and the idle Strategy For Synchronization Control of positive sequence, negative phase-sequence, realize voltage stabilization, Harmonic filtration and reactive-load compensation are so that the quality of power supply is effectively administered, so as to overcome the deficiencies in the prior art.
Technical scheme：To realize above-mentioned purpose of utility model, the utility model uses has unified electric energy based on specific The hybrid power electronic transformer topology of quality controlling function.
A kind of hybrid power electronic transformer of unified power quality controlling, including suitable for middle pressure AC distribution net Multiple coil Industrial Frequency Transformer, suitable for the connection in series-parallel back-to-back converter of triangle connection and Y-connection and mixed suitable for this Mould assembly electric power electric transformer；
The Industrial Frequency Transformer includes three windings, the first winding connection 10kV AC distribution nets, and the second winding major loop is made To connect normal load, tertiary winding connection electronic power convertor after the upper current transformer outlet side of 400V distributions series connection；
The electronic power convertor is two level back to back structure, inverse comprising an AC/DC rectification unit, a DC/AC Become unit, the LC filter units of both sides, an electric discharge/balanced loop unit and a direct current output port, wherein, rectification unit It is three phase full bridge structure with inversion unit, prime rectification unit, electric discharge/balanced loop unit, later stage inversion unit phase successively Even, direct current output port is parallel to electric discharge balanced loop outlet both ends；
The hybrid power electronic inverter output port passes through transformer and the second winding load end series coupled, rectification Unit has reactive-load compensation, harmonic wave control ability, and inversion unit has voltage regulation capability；
The hybrid power electronic inverter includes Power Quality Detection unit, gathers net side three-phase voltage first, passes through dq0Orthogonal coordinates convert to obtain active and reactive and zero-sequence component, then by active and reactive signal by wave filter, obtain it is active, Idle DC component, obtained active and reactive, zero-sequence component are subjected to orthogonal coordinates inverse transformation, obtain harmonic voltage component, net It is voltage harmonic and allocation of distortion that side voltage, which subtracts harmonic component,；
Topology includes following structure：
A, multiwinding transformer includes three windings, wherein the first winding（1）Connect net side, the second winding（2）As master Normal load, the tertiary winding are connected after circuit in series current transformer output side transformer（3）It is connected with electronic power convertor；
B, major loop head and end access bypass, and by-pass switch is connected at both ends；
C, electronic power convertor prime AC/DC rectification units include 6 IGBT and 6 anti-parallel diodes, and every two Individual IGBT and anti-parallel diodes head and the tail are composed in series a bridge arm, and prime three phase full bridge is made up of three bridge arms, Mei Geqiao The midpoint of arm and the tertiary winding of multiwinding transformer（3）Connection, prime three phase full bridge output stage are connected with electric discharge/balanced loop Connect；
B, current transformer both ends connect one group of wave filter respectively, and by-pass switch, while major loop are added at current transformer top Series transformer parallel connection switching IGCT；
C, electric discharge/balanced loop unit includes 2 IGBT and 2 electric capacity, and two IGBT head and the tail are connected, two electric capacity head and the tail Series connection, the IGBT and electric capacity after series connection are parallel with one another, and resistance, and series electrical are connected between series IGBT midpoint and series capacitance midpoint Hold neutral earthing, electric discharge/balanced loop unit output stage is connected with rear class DC/AC inversion units；
D, direct current output port is parallel to electric discharge/balanced loop unit output stage both ends, for connecing DC load and distribution The formula energy；
E, IGBT and 6 anti-parallel diodes of rear class DC/AC inversion units 6, each two IGBT and reverse parallel connection two Pole pipe head and the tail are composed in series a bridge arm, and rear class three phase full bridge is made up of three bridge arms, each bridge arm center tap, as electric power The output port of electronic inverter；
F, the output port of electronic power convertor passes through transformer and the second winding（2）Load end is coupled, so as to rise To the effect of power quality controlling.
Beneficial effect：The utility model have unified power quality controlling function hybrid power electronic transformer and its Control method, it can effectively suppress the pollution of unbalanced power supply degree harmonic, prevent Voltage Drop, be provided simultaneously with no-power compensation function With stable DC output function, it is greatly improved power quality indexes.
Brief description of the drawings
Fig. 1 hybrid powers electronic transformer topology；
Fig. 2 Power Quality Detection figures；
Fig. 3 dynamic voltage regulations control；
Fig. 4 static reactive power compensations control；
In figure：Wherein：The windings of 1- first；The windings of 2- second；The 3- tertiary windings.
Embodiment
The utility model is further illustrated below in conjunction with the accompanying drawings
The multiwinding transformer and electronic power convertor that the utility model is related to, the wherein tertiary winding（3）Using including Two kinds of connected modes that Y-connection connects with triangle, electronic power convertor are combined using dynamic regulation and static regulation Control mode, there is hybrid power electronic transformer and its control method specific implementation of unified power quality controlling function Method is as follows：
Power Quality Detection control process as shown in Fig. 2 gather net side three-phase voltage, by the change of dq0 orthogonal coordinates first Get active and reactive and zero-sequence component in return, then active and reactive signal obtained into active and reactive DC component by wave filter, Obtained active and reactive, zero-sequence component are subjected to orthogonal coordinates inverse transformation, obtain harmonic voltage component, voltage on line side subtracts humorous Wave component is voltage harmonic and allocation of distortion；
Voltage Stability Control process is as shown in figure 3, using PI double-closed-loop controls, by the voltage on line side and load gathered Side voltage, by PI regulations and filter filtering, finally obtain the compensation output voltage for injecting net side；
The control of reactive power compensating mode is as shown in Figure 4.Power network three-phase voltage is gathered, it is orthogonal to carry out positive sequence d-q to three-phase voltage Coordinate transform and the conversion of negative phase-sequence d-q orthogonal coordinates, obtain that positive sequence is active and reactive component and negative phase-sequence is active and reactive component； Meanwhile unit collection power network three-phase current, the conversion of positive sequence d-q orthogonal coordinates and the conversion of negative phase-sequence d-q orthogonal coordinates are carried out respectively, are obtained To positive sequence active component signal and the active and reactive signal of negative phase-sequence；Unit inverter side fed-back current signals pass through the orthogonal seats of positive sequence d-q Mark conversion and negative phase-sequence d-q orthogonal coordinates convert to obtain positive sequence and the active and reactive current instantaneous value of negative phase-sequence；DC voltage instantaneous value Make difference with reference value and positive sequence watt current reference value is used as after pi regulator, become by load-side electric current by positive sequence d-q coordinates Positive sequence active component reference value is obtained after changing；Unit is used using positive sequence, the double sequence Strategy For Synchronization Controls of negative phase-sequence, positive sequence reactive component Compensated with the positive sequence transform controller of frequency rotation, obtain positive sequence voltage control instruction signal and negative sequence component is negative with what is rotated Sequence transform controller compensates, and obtains negative voltage control command signal, negative sequence voltage command signal is changed to positive sequence d-q coordinates Under system, obtain inputting the voltage command signal of SVPWM modules and two controllers while work, completion positive sequence and negative phase-sequence it is idle Component compensation.
Described above is only preferred embodiment of the present utility model, it should be pointed out that：For the common skill of the art For art personnel；On the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improve and Retouching also should be regarded as the scope of protection of the utility model.

Claims (2)

  1. A kind of 1. hybrid power electronic transformer of unified power quality controlling, it is characterised in that：The power quality controlling The topology that hybrid power electronic transformer is combined based on traditional transformer with electronic power convertor, including suitable for middle pressure The Multiple coil Industrial Frequency Transformer of AC distribution net, the connection in series-parallel back-to-back converter suitable for triangle connection and Y-connection；
    Described Industrial Frequency Transformer includes three windings, the first winding（1）Connect 10kV AC distribution nets, the second winding（2）It is main Loop connects normal load, the tertiary winding later as the upper current transformer outlet side of 400V distributions series connection（3）Power electronics is connected to become Flow device；
    Described electronic power convertor is two level back to back structure, inverse comprising an AC/DC rectification unit, a DC/AC Become unit, the LC filter units of both sides, an electric discharge/balanced loop unit and a direct current output port, wherein, rectification unit It is three phase full bridge structure with inversion unit, prime rectification unit, electric discharge/balanced loop unit, later stage inversion unit phase successively Even, direct current output port is parallel to electric discharge balanced loop outlet both ends；
    Described electronic power convertor output port passes through transformer and the second winding（2）Load end series coupled；
    Described electronic power convertor includes Power Quality Detection unit, net side three-phase voltage is gathered first, by dq0It is orthogonal Coordinate transform obtains active and reactive and zero-sequence component, then active and reactive signal is obtained into active and reactive direct current by wave filter Component, obtained active and reactive, zero-sequence component are subjected to orthogonal coordinates inverse transformation, obtain harmonic voltage component, voltage on line side subtracts It is voltage harmonic and allocation of distortion to go harmonic component.
  2. 2. a kind of hybrid power electronic transformer of unified power quality controlling according to claim 1, its feature exist In：Topology includes following structure：
    Multiwinding transformer includes three windings, wherein the first winding（1）Connect net side, the second winding（2）As major loop string Normal load, the tertiary winding are connected after connection current transformer output side transformer（3）It is connected with electronic power convertor；
    The access bypass of major loop head and end, and connect by-pass switch at both ends；
    Electronic power convertor prime AC/DC rectification units include 6 IGBT and 6 anti-parallel diodes, each two IGBT A bridge arm is composed in series with anti-parallel diodes head and the tail, prime three phase full bridge is made up of three bridge arms, in each bridge arm The tertiary winding of point and multiwinding transformer（3）Connection, prime three phase full bridge output stage are connected with electric discharge/balanced loop；
    Current transformer both ends connect one group of wave filter respectively, and by-pass switch is added at current transformer top, while major loop series connection becomes Depressor parallel connection switching IGCT；
    Electric discharge/balanced loop unit includes 2 IGBT and 2 electric capacity, and two IGBT head and the tail are connected, and two electric capacity head and the tail are connected, IGBT and electric capacity after series connection is parallel with one another, and resistance is connected between series IGBT midpoint and series capacitance midpoint, and in series capacitance Point ground connection, electric discharge/balanced loop unit output stage are connected with rear class DC/AC inversion units；
    Direct current output port is parallel to electric discharge/balanced loop unit output stage both ends, for connecing DC load and distributed energy；
    6 IGBT and 6 anti-parallel diodes of rear class DC/AC inversion units, each two IGBT and anti-parallel diodes are first Tail is composed in series a bridge arm, and rear class three phase full bridge is made up of three bridge arms, each bridge arm center tap, becomes as power electronics Flow the output port of device；
    The output port of electronic power convertor passes through transformer and the second winding（2）Load end is coupled.
CN201720494769.2U 2017-05-05 2017-05-05 A kind of hybrid power electronic transformer of unified power quality controlling Active CN207010241U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106972505A (en) * 2017-05-05 2017-07-21 贵州电网有限责任公司电力科学研究院 The hybrid power electronic transformer and its control method of unified power quality controlling
CN109038691A (en) * 2018-07-10 2018-12-18 东南大学 Hybrid power electronic transformer frequency modulation and voltage modulation control strategy based on virtual inertia
CN112054528A (en) * 2020-09-01 2020-12-08 武汉理工大学 Distributed power flow controller topology suitable for power distribution network and control method
CN115001047A (en) * 2022-08-03 2022-09-02 国网湖北省电力有限公司经济技术研究院 Energy router and transformer parallel system and control method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106972505A (en) * 2017-05-05 2017-07-21 贵州电网有限责任公司电力科学研究院 The hybrid power electronic transformer and its control method of unified power quality controlling
CN106972505B (en) * 2017-05-05 2023-09-22 贵州电网有限责任公司电力科学研究院 Mixed power electronic transformer for unified power quality control and control method thereof
CN109038691A (en) * 2018-07-10 2018-12-18 东南大学 Hybrid power electronic transformer frequency modulation and voltage modulation control strategy based on virtual inertia
CN112054528A (en) * 2020-09-01 2020-12-08 武汉理工大学 Distributed power flow controller topology suitable for power distribution network and control method
CN112054528B (en) * 2020-09-01 2024-04-05 武汉理工大学 Distributed power flow controller topology suitable for power distribution network and control method
CN115001047A (en) * 2022-08-03 2022-09-02 国网湖北省电力有限公司经济技术研究院 Energy router and transformer parallel system and control method thereof

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