CN106972505A - The hybrid power electronic transformer and its control method of unified power quality controlling - Google Patents
The hybrid power electronic transformer and its control method of unified power quality controlling Download PDFInfo
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- CN106972505A CN106972505A CN201710317208.XA CN201710317208A CN106972505A CN 106972505 A CN106972505 A CN 106972505A CN 201710317208 A CN201710317208 A CN 201710317208A CN 106972505 A CN106972505 A CN 106972505A
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- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
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- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Inverter Devices (AREA)
Abstract
There is the hybrid power electronic transformer and its control method, the topology that the Power Quality Detection and control method are combined based on traditional transformer with electronic power convertor of unified power quality controlling function the invention discloses a kind of, and following part can be divided into：Hardware circuit is connected：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 inverse transformation is carried out 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：By the synchronous decoupling of positive sequence, negative phase-sequence, double sequence Synchronization Controls finally obtain reactive-load compensation amount.
Description
Technical field
The hybrid power electronic transformer and its control method of the unified power quality controlling of present invention design, belong to electric power
Applied technical field of the electronics in power system.
Technical background
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.As China's science and technology and national economy are developed rapidly, 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, the characteristics of power system occurs in that a series of new：One is 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；Two be that renewable energy power generation technology has obtained general
All over concern, the power supply of power system is become diversified forms by traditional industrial frequency AC form and deposited, and such as dc source (send out by photovoltaic
Electricity), AC frequency conversion power supply (wind-power electricity generation) etc., in these renewable energy systems, be directed to it is a series of it is high-power,
Efficiently, high-quality energy conversion and control problem；Three be nonlinear-load rapid development, under causing power quality continuous
Drop, and a large amount of requirements of the sensitiveness load user to the quality of power supply about comes higher, causes power quality problem to become increasingly conspicuous.
In power system under the background of these new challenges, become as the electric power of the most basic power transmission and transformation device of power system
Depressor, excessively single function 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；Band non-thread
Property load when, distortion current can be polluted by transformer coupled entrance power network to power network；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 problem and to put into practice problem, be also 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
Goal of the invention：For the topology and its key control technology of hybrid power electronic transformer, in topology, electric energy matter
Several aspects such as amount detection, Voltage Stability Control, the control of reactive power compensating are made that research.It is an object of the invention to propose one kind
Hybrid power electronic transformer and its control method with unified power quality controlling function, the mixed type transformer both had
There are the basic functions such as electric energy transmission, voltage conversion, the new function with Power Quality Detection and improvement, the function is new
On the basis of topology, by PI double-loop control strategies and the idle Strategy For Synchronization Control of positive sequence, negative phase-sequence, the steady of voltage is realized
Fixed, 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：For achieving the above object, the present invention has unified power quality controlling using based on specific
The Voltage Stability Control and power-less compensation control method of the hybrid power electronic transformer topology of function.
The hybrid power electronic transformer and its control method of unified power quality controlling, including exchanged suitable for middle pressure
The Multiple coil Industrial Frequency Transformer of power distribution network, connect suitable for triangle and the connection in series-parallel back-to-back converter of Y-connection and suitable
Major loop power quality detection method and control method for the hybrid power electronic transformer；
The Industrial Frequency Transformer includes three windings, and the first winding connection 10kV AC distribution nets, 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 two 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, and net side three-phase voltage u is gathered firstsa、
usb、usc, by dq0Orthogonal coordinates conversion obtains active and reactive and zero-sequence component, then by active and reactive signal by wave filter,
Active and reactive DC component is obtained, obtained active and reactive, zero-sequence component are subjected to orthogonal coordinates inverse transformation, harmonic wave electricity is obtained
Component is pressed, it is voltage harmonic and allocation of distortion that voltage on line side, which subtracts harmonic component,；
The control method of power quality controlling includes the control method that Voltage Stability Control and the control of reactive power compensating are combined,
Wherein Voltage Stability Control unit collection voltage on line side usWith load terminal voltage ul, with ulrefFor given reference voltage and ulMake
Difference, income value and u after PI is adjustedlrefAnd usDifference be added, and subtract the filtered circuit after gain, gained signal is by inverse
Become device kiAfter obtain inverter voltage ui, superposition filtering voltage negative-feedback uc, it is filtered into wave filter, gained filtering voltage warp
By filtered circuit negative-feedback, finally output adjusts voltage Δ u after n times of gain；
The control of reactive power compensating unit gathers power network three-phase voltage, three-phase voltage is carried out the conversion of positive sequence d-q orthogonal coordinates and
Negative phase-sequence d-q orthogonal coordinates are converted, and obtain that positive sequence is active and reactive componentAnd negative phase-sequence is active and reactive componentMeanwhile, unit collection power network three-phase current carries out the conversion of positive sequence d-q orthogonal coordinates and negative phase-sequence d-q orthogonal coordinates respectively
Conversion, obtains positive sequence active component signalWith the active and reactive signal of negative phase-sequenceUnit inverter side feedback current is believed
Number by the conversion of positive sequence d-q orthogonal coordinates and the conversion of negative phase-sequence d-q orthogonal coordinates obtains positive sequence and the active and reactive electric current of negative phase-sequence is instantaneous
ValueDC voltage instantaneous value udcWith reference value udcrefMake difference and the active electricity of positive sequence is used as after pi regulator
Flow reference valueBy load-side electric current positive sequence active component reference value is obtained after positive sequence d-q coordinate transformsUnit is adopted
With positive sequence, the double sequence Synchronization Controls of negative phase-sequence, positive sequence reactive component is used the positive sequence transform controller compensation rotated with frequencies omega, obtained
Positive sequence voltage control instruction signalWithNegative sequence component is compensated with-ω negative phase-sequence the transform controllers rotated, obtains negative phase-sequence electricity
Voltage-controlled command signal processedNegative sequence voltage command signal is changed to positive sequence d-q coordinate systems, obtains inputting SVPWM moulds
The voltage command signal of blockWithTwo controllers work simultaneously, complete power quality controlling control.
Topology includes following structure：
A, multiwinding transformer include three windings, wherein the first winding (1) connects net side, the second winding (2) is used as master
Normal load is connected after circuit in series current transformer output side transformer, the tertiary winding (3) is connected with electronic power convertor；
B, the access bypass of major loop head and end, and connect by-pass switch at two ends；
C, electronic power convertor prime AC/DC rectification units include 6 IGBT and 6 anti-parallel diodes, 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 (3) of multiwinding transformer are connected, and prime three phase full bridge output stage is connected with electric discharge/balanced loop
Connect；
D, current transformer two ends connect one group of wave filter respectively, and add by-pass switch at current transformer top, while major loop
Series transformer parallel connection switching IGCT；
E, electric discharge/balanced loop unit include 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 is 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；
F, direct current output port are parallel to electric discharge/balanced loop unit output stage two ends, for connecing DC load and distribution
The formula energy；
G, 6 IGBT and 6 anti-parallel diodes of rear class DC/AC inversion units, 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, and each bridge arm center tap is used as electric power
The output port of electronic inverter；
H, the output port of electronic power convertor are coupled by transformer with the second winding (2) load end, so as to rise
To the effect of power quality controlling.
The method of Power Quality Detection is comprised the following steps：
The first step, collection net side three-phase voltage usa、usb、usc, active and reactive and zero are obtained by the conversion of dq0 orthogonal coordinates
Order components；
Second step, by active and reactive signal by wave filter, obtain active and reactive DC component；
3rd step, obtained active and reactive, zero-sequence component is subjected to orthogonal coordinates inverse transformation, obtains harmonic voltage component；
It is voltage harmonic and allocation of distortion that 4th step, voltage on line side, which subtract harmonic component,.
The control method that Voltage Stability Control and the control of reactive power compensating are combined includes Voltage Stability Control and reactive-load compensation
Control.
Voltage Stability Control includes：
A, collection voltage on line side usWith load side voltage ul, set-point ulrefWith ulIt is poor to make, and is adjusted into pi regulator
Section, while by set-point ulrefWith usIt is poor to make；
B, the output signal of pi regulator and set-point ulrefAnd usDifference be added, and subtract KcFiltered electrical flow valuve again, warp
Cross inverter gain ki, subtract after filtering voltage, signal enters wave filter；
Through overload terminal voltage negative-feedback after the filtered device filtering of c, signal, and after n times of gain, output injection line voltage
Δu.6th, the hybrid power electronic transformer and its control method of described unified power quality controlling are required according to right 4,
It is characterized in that：The control of reactive power compensating includes：
A, collection power network three-phase voltage usa、usb、usc, three-phase current isa、isb、iscAnd control unit inverter side three-phase electricity
Flow ica、icb、icc, and three groups of voltages, electric currents are subjected to the conversion of positive sequence d-q orthogonal coordinates and the change of negative phase-sequence d-q orthogonal coordinates respectively
Change, obtain that positive sequence is active and reactive componentAnd negative phase-sequence is active and reactive componentPositive sequence active component signalWith the active and reactive signal of negative phase-sequencePositive sequence and the active and reactive current instantaneous value of negative phase-sequence
I, acquisition control unit DC voltage udc, and with set-point udcrefIt is adjusted after making difference into pi regulator,
Export positive sequence watt current reference value
J, positive sequence reactive component use the positive sequence transform controller compensation rotated with frequencies omega, by Current Decoupling, obtain
Positive sequence voltage control instruction signalWithNegative sequence component is compensated with-ω negative phase-sequence the transform controllers rotated, passes through solution for the current
Coupling, obtains negative voltage control command signal
D, negative sequence voltage command signal changed to positive sequence d-q coordinate systems, obtain inputting the voltage instruction of SVPWM modules
SignalWithTwo controllers work simultaneously, complete power quality controlling control.
Beneficial effect：The present invention has hybrid power electronic transformer and its control of unified power quality controlling function
Method, can effectively suppress the pollution of unbalanced power supply degree harmonic, prevent Voltage Drop, be provided simultaneously with no-power compensation function and steady
Determine direct current output function, be greatly improved power quality indexes.
Brief description of the drawings
Fig. 1 hybrid powers electronic transformer topology
Fig. 2 power quality detection methods
Fig. 3 dynamic voltage regulations are controlled
Fig. 4 static reactive power compensations are controlled
In figure：Wherein：The windings of 1- first；The windings of 2- second；The 3- tertiary windings.
Embodiment
The present invention is further described below in conjunction with the accompanying drawings
Multiwinding transformer and electronic power convertor of the present invention, the wherein tertiary winding (3), which are used, includes star
Two kinds of connected modes that connection and triangle are connected, the control that electronic power convertor is combined using dynamic regulation and static regulation
Mode processed, hybrid power electronic transformer and its control method specific implementation method with unified power quality controlling function
It is as follows：
Power Quality Detection control process is as shown in Fig. 2 collection net side three-phase voltage u firstsa、usb、usc, by dq0 just
Coordinate transform is handed over to obtain active and reactive and zero-sequence component ud、uq、u0, then active and reactive signal had by wave filter
Work(, idle DC componentObtained active and reactive, zero-sequence component are subjected to orthogonal coordinates inverse transformation, harmonic wave electricity is obtained
Press component uaf、ubf、ucf, it is voltage harmonic and allocation of distortion u that voltage on line side, which subtracts harmonic component,ah、ubh、uch；
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 obtains the compensation output voltage Δ u of injection 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 componentAnd negative phase-sequence is active and idle
ComponentMeanwhile, unit collection power network three-phase current, carries out the conversion of positive sequence d-q orthogonal coordinates respectively and negative phase-sequence d-q is orthogonal
Coordinate transform, obtains positive sequence active component signalWith the active and reactive signal of negative phase-sequenceUnit inverter side feedback current
Signal obtains positive sequence and negative phase-sequence active and reactive electric current wink by the conversion of positive sequence d-q orthogonal coordinates and the conversion of negative phase-sequence d-q orthogonal coordinates
DurationDC voltage instantaneous value udcWith reference value udcrefMake difference active as positive sequence after pi regulator
Current reference valueBy load-side electric current positive sequence active component reference value is obtained after positive sequence d-q coordinate transformsUnit
Using positive sequence, the double sequence Strategy For Synchronization Controls of negative phase-sequence, positive sequence reactive component uses the positive sequence transform controller rotated with frequencies omega to mend
Repay, obtain positive sequence voltage control instruction signalWithNegative sequence component is compensated with-ω negative phase-sequence the transform controllers rotated, is obtained
Negative voltage control command signalNegative sequence voltage command signal is changed to positive sequence d-q coordinate systems, inputted
The voltage command signal of SVPWM modulesWithTwo controllers are worked simultaneously, and the reactive component for completing positive sequence and negative phase-sequence is mended
Repay.
Described above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member；Under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. the hybrid power electronic transformer and its control method of unified power quality controlling, it is characterised in that：The electric energy matter
Measure the hybrid power electronic transformer administered and its control method is combined based on traditional transformer with electronic power convertor
Topology, including suitable for it is middle pressure AC distribution net Multiple coil Industrial Frequency Transformer, triangle connection and Y-connection string simultaneously
Join the major loop power quality detection method and control method of back-to-back converter and hybrid power electronic transformer；
The Industrial Frequency Transformer includes three windings, the first winding (1) connection 10kV AC distribution nets, the second winding (2) major loop
As normal load is connected after the upper current transformer outlet side of 400V distributions series connection, the tertiary winding (3) connects electronic power convertor；
The electronic power convertor is two level back to back structure, includes an AC/DC rectification unit, a DC/AC inversion list
Member, the LC filter units of both sides, an electric discharge/balanced loop unit and a direct current output port, wherein, rectification unit and inverse
It is three phase full bridge structure to become unit, and prime rectification unit, electric discharge/balanced loop unit, later stage inversion unit are sequentially connected, directly
Stream output port is parallel to electric discharge balanced loop outlet two ends；
The hybrid power electronic inverter output port passes through transformer and the second winding (2) 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, and net side three-phase voltage u is gathered firstsa、usb、usc,
By dq0Orthogonal coordinates conversion obtains active and reactive and zero-sequence component, then active and reactive signal is had by wave filter
Work(, idle DC component, carry out orthogonal coordinates inverse transformation by obtained active and reactive, zero-sequence component, obtain harmonic voltage point
Amount, it is voltage harmonic and allocation of distortion that voltage on line side, which subtracts harmonic component,；
The control method of power quality controlling includes the control method that Voltage Stability Control and the control of reactive power compensating are combined, wherein
Voltage Stability Control unit collection voltage on line side usWith load terminal voltage ul, with ulrefFor given reference voltage and ulIt is poor to make, warp
Cross income value and u after PI regulationslrefAnd usDifference be added, and subtract the filtered circuit after gain, gained signal passes through inverter ki
After obtain inverter voltage ui, superposition filtering voltage negative-feedback uc, it is filtered into wave filter, gained filtering voltage is via filtering
Current Negative Three-Point Capacitance, finally output adjusts voltage Δ u after n times of gain；
The control of reactive power compensating unit gathers power network three-phase voltage, and the conversion of positive sequence d-q orthogonal coordinates and negative phase-sequence are carried out to three-phase voltage
D-q orthogonal coordinates are converted, and obtain that positive sequence is active and reactive componentAnd negative phase-sequence is active and reactive componentTogether
When, unit collection power network three-phase current carries out the conversion of positive sequence d-q orthogonal coordinates and the conversion of negative phase-sequence d-q orthogonal coordinates, obtained respectively
Positive sequence active component signalWith the active and reactive signal of negative phase-sequenceUnit inverter side fed-back current signals pass through positive sequence
D-q orthogonal coordinates are converted and the conversion of negative phase-sequence d-q orthogonal coordinates obtains positive sequence and the active and reactive current instantaneous value of negative phase-sequenceDC voltage instantaneous value udcWith reference value udcrefMake difference and positive sequence watt current is used as after pi regulator
Reference valueBy load-side electric current positive sequence active component reference value is obtained after positive sequence d-q coordinate transformsUnit is used
The double sequence Synchronization Controls of positive sequence, negative phase-sequence, positive sequence reactive component uses the positive sequence transform controller compensation rotated with frequencies omega, obtains just
Sequence voltage control instruction signalWithNegative sequence component is compensated with-ω negative phase-sequence the transform controllers rotated, obtains negative sequence voltage
Control instruction signalNegative sequence voltage command signal is changed to positive sequence d-q coordinate systems, obtains inputting SVPWM modules
Voltage command signalWithTwo controllers work simultaneously, complete power quality controlling control.
2. the hybrid power electronic transformer and its control method of described unified power quality controlling are required according to right 1,
It is characterized in that：Topology includes following structure：
A, multiwinding transformer include three windings, wherein the first winding (1) connects net side, the second winding (2) is used as major loop
Normal load is connected after series converter output side transformer, the tertiary winding (3) is connected with electronic power convertor；
B, the access bypass of major loop head and end, and connect by-pass switch at two ends；
C, electronic power convertor prime AC/DC rectification units include 6 IGBT and 6 anti-parallel diodes, each two
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, each bridge arm
Midpoint and the tertiary winding (3) of multiwinding transformer connect, prime three phase full bridge output stage is connected with electric discharge/balanced loop
Connect；
D, current transformer two ends connect one group of wave filter respectively, and add by-pass switch at current transformer top, while major loop is connected
Transformers connected in parallel switching IGCT；
E, electric discharge/balanced loop unit include 2 IGBT and 2 electric capacity, and two IGBT head and the tail are connected, and two electric capacity head and the tail are gone here and there
Connection, the IGBT and electric capacity after series connection is parallel with one another, and resistance, and series capacitance are connected between series IGBT midpoint and series capacitance midpoint
Neutral earthing, electric discharge/balanced loop unit output stage is connected with rear class DC/AC inversion units；
F, direct current output port are parallel to electric discharge/balanced loop unit output stage two ends, for connecing DC load and distributed energy
Source；
G, 6 IGBT and 6 anti-parallel diodes of rear class DC/AC inversion units, each two IGBT and anti-parallel diodes
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, and each bridge arm center tap is used as power electronics
The output port of current transformer；
H, the output port of electronic power convertor are coupled by transformer with the second winding (2) load end, so as to play electricity
The effect of energy quality controlling.
3. the hybrid power electronic transformer and its control method of described unified power quality controlling are required according to right 1,
It is characterized in that：The method of Power Quality Detection is comprised the following steps：
The first step, collection net side three-phase voltage usa、usb、usc, active and reactive and zero sequence point is obtained by the conversion of dq0 orthogonal coordinates
Amount；
Second step, by active and reactive signal by wave filter, obtain active and reactive DC component；
3rd step, obtained active and reactive, zero-sequence component is subjected to orthogonal coordinates inverse transformation, obtains harmonic voltage component；
It is voltage harmonic and allocation of distortion that 4th step, voltage on line side, which subtract harmonic component,.
4. the hybrid power electronic transformer and its control method of described unified power quality controlling are required according to right 1,
It is characterized in that：The control method that Voltage Stability Control and the control of reactive power compensating are combined includes Voltage Stability Control and idle benefit
Repay control.
5. the hybrid power electronic transformer and its control method of described unified power quality controlling are required according to right 4,
It is characterized in that：Voltage Stability Control includes：
A, collection voltage on line side usWith load side voltage ul, set-point ulrefWith ulIt is poor to make, and is adjusted into pi regulator, simultaneously
By set-point ulrefWith usIt is poor to make；
B, the output signal of pi regulator and set-point ulrefAnd usDifference be added, and subtract KcFiltered electrical flow valuve again, by inverse
Become device gain ki, subtract after filtering voltage, signal enters wave filter；
Through overload terminal voltage negative-feedback after the filtered device filtering of c, signal, and after n times of gain, output injection line voltage Δ u.
6. the hybrid power electronic transformer and its control method of described unified power quality controlling are required according to right 4,
It is characterized in that：The control of reactive power compensating includes：
A, collection power network three-phase voltage usa、usb、usc, three-phase current isa、isb、iscAnd control unit inverter side three-phase current
ica、icb、icc, and three groups of voltages, electric currents are subjected to the conversion of positive sequence d-q orthogonal coordinates and the conversion of negative phase-sequence d-q orthogonal coordinates respectively,
Obtain that positive sequence is active and reactive componentAnd negative phase-sequence is active and reactive componentPositive sequence active component signal
With the active and reactive signal of negative phase-sequencePositive sequence and the active and reactive current instantaneous value of negative phase-sequence
B, acquisition control unit DC voltage udc, and with set-point udcrefIt is adjusted, exports into pi regulator after making difference
Positive sequence watt current reference value
C, positive sequence reactive component use the positive sequence transform controller compensation rotated with frequencies omega, by Current Decoupling, obtain positive sequence
Voltage control instructions signalWithNegative sequence component is compensated with-ω negative phase-sequence the transform controllers rotated, by Current Decoupling, is obtained
To negative voltage control command signal
D, negative sequence voltage command signal changed to positive sequence d-q coordinate systems, obtain inputting the voltage command signal of SVPWM modulesWithTwo controllers work simultaneously, complete power quality controlling control.
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