CN107611992A - A kind of three phase separation formula hybrid power electronic transformer and its control method - Google Patents
A kind of three phase separation formula hybrid power electronic transformer and its control method Download PDFInfo
- Publication number
- CN107611992A CN107611992A CN201711101070.6A CN201711101070A CN107611992A CN 107611992 A CN107611992 A CN 107611992A CN 201711101070 A CN201711101070 A CN 201711101070A CN 107611992 A CN107611992 A CN 107611992A
- Authority
- CN
- China
- Prior art keywords
- phase separation
- power electronic
- hybrid power
- separation formula
- electronic transformer
- 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
Links
Classifications
-
- 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
Landscapes
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of three phase separation formula hybrid power electronic transformer and its control method, described three phase separation formula mixed type transformer includes multiwinding transformer, the back-to-back converter of H bridges, static switch, realize that the quality of power supply regulates and controls, it increase effectively electric power electric transformer capacity, realize powerful electric energy transmission, by using the back-to-back converter of three phase separation formula H bridges, a single-phase full bridge circuit is used in per circuitry phase, it is completely independent every circuitry phase, realize per phase loop reactive power independent compensation, independent control and reactive-current compensation and the dynamic electric voltage recovery to split-phase, ensure the stabilization of output voltage；The present invention realizes effective switching of series connection side converter by the reasonable control to static switch simultaneously, it is ensured that output voltage is unaffected under normal operation, effectively reduces influence of the harmonic wave to the quality of power supply caused by compensation circuit.
Description
Technical field
The present invention relates to application field of the power electronic devices in power system, more particularly to a kind of three phase separation formula to mix
Mould assembly electric power electric transformer and its control method.
Background technology
With the development and extensive use of Power Electronic Technique, electric power electric transformer is increasingly subject to the concern of people.Electricity
Power electronic transformer while having the advantages that floor space is small, compact-sized, regulating power is strong, also have capacity it is small, input
The shortcomings that output voltage grade is low, its electric energy transmittability are far below traditional transformer.
Traditional transformer major function is to realize the conversion of alternating voltage grade at present, realizes the transmission and disttrbution work(of power network
Can, do not possess the ability being adjusted for the power network quality of power supply, although and current electric power electric transformer to line voltage,
The control ability of electric current is stronger, but the shortcomings that transmission capacity is smaller, voltage class is low be present, it is therefore desirable to proposes a kind of three-phase separate
Both had traditional transformer capacity big from formula hybrid power electronic transformer, it may have electric power electric transformer is to power network electricity
The advantages of pressure, electric current control more by force, realized by the power electronic devices in three phase separation formula hybrid power electronic transformer
Reactive-load compensation and the function of dynamic voltage compensation, the power network quality of power supply is improved, while existing hybrid power electronics becomes at present
Depressor uses three phase full bridge structure, interrelated per circuitry phase, can not carry out independent compensation to the reactive power of each phase respectively,
And then independent control can not be carried out to every circuitry phase voltage compensation, meanwhile, the hybrid power electronic transformer used at present
The dynamic compensation of voltage can not be realized, and used voltage compensating circuit can bring harmonic wave to power network, to the shadow of the quality of power supply
Sound is larger.
The content of the invention
Present invention solves the technical problem that：
A kind of three phase separation formula hybrid power electronic transformer and its control method are provided, to solve traditional transformer not
The problem of power electronics transformation capacity for possessing power network quality of power supply regulating power and using at present is small, while to solve mesh
Preceding electric power electric transformer can not enter Mobile state independent compensation and independent control to the reactive power of each circuitry phase respectively, with
And currently used voltage compensating circuit is brought compared with multiple-harmonic to power network, to the quality of power supply the problem of having a great influence.
Technical scheme：
A kind of three phase separation formula hybrid power electronic transformer, including multiwinding transformer and the back-to-back converter of H bridges,
Described multiwinding transformer includes primary side winding, the first vice-side winding and the second vice-side winding, multiwinding transformer primary side around
Group is connected with 10kV power network triangles, and the first vice-side winding of multiwinding transformer is connected with the first by-pass switch, and described the
Bypass switch, filter inductance and the back-to-back converter of H bridges are sequentially connected, and the back-to-back converter of H bridges is connected with LC wave filters, more
Second vice-side winding of winding transformer is connected with the second by-pass switch and the 3rd by-pass switch respectively, and the described the 3rd bypass is opened
Close and connected with load, the second described by-pass switch is connected with static switch and LC wave filters respectively, static switch and LC filtering
Device is connected with the 4th by-pass switch respectively, and the 4th by-pass switch connects with load.
The described back-to-back converter of H bridges is phase separation structure, independent mutually per the back-to-back converter of phase H bridges, per phase H bridges
Back-to-back converter includes a parallel connection converter and a series transformer, and described parallel connection converter and series transformer are simultaneously
Connection connection.
Described static switch is three phase static switch, and two reverse IGCTs are included per phase static switch, described two
Individual reversely IGCT is connected in parallel.
Each parallel connection converter and series transformer include four bi-directional switch structures, described bi-directional switch structure two
Two be connected in series after be connected in parallel again.
Described bi-directional switch structure includes IGBT and backward dioded, described IGBT and backward dioded
It is connected in parallel.
A kind of three phase separation formula hybrid power electronic transformer, it is characterised in that：Control method comprises the following steps：
Step 1：Measure three phase separation formula hybrid power electronic transformer voltage, electric current；
Step 2：Three phase separation formula hybrid power electronic transformer reactive power is calculated, compensation electric current is controlled；
Step 3：Detect three phase separation formula hybrid power electronic transformer voltage failure；
Step 4：Three phase separation formula hybrid power electronic transformer dynamic voltage compensation and control.
Measurement three phase separation formula hybrid power electronic transformer voltage, electric current described in step 1 is further comprising the steps of：
Step 1.1 measures the voltage u of load circuita、ub、uc, load circuit electric current ia、ib、ic；
Step 1.2 measures the output current i of parallel connection converterLpa、iLpb、iLpcAnd the output current i of series transformerLa、
iLb、iLc；
Step 1.3 measures the capacitance current i of series transformersa、isb、isc, capacitance voltage uga、ugb、ugc；
Step 1.4 by the voltage of the load circuit of measurement, electric current, the output current of parallel connection converter and series transformer with
And the capacitance current and capacitance voltage of series transformer carry out Clark conversion.
Calculating three phase separation formula hybrid power electronic transformer reactive power described in step 2, compensation electric current is carried out
Control further comprising the steps of：
Step 2.1 calculates three phase separation formula hybrid power electronic transformer Single Phase Reactive Currents iid、iiq；
Step 2.2 calculates three phase separation formula hybrid power electronic transformer reactive-load compensation electric current Δ iiq, wherein i=a, b,
c；
Step 2.3 carries out closed-loop control to reactive-load compensation electric current.
Detection three phase separation formula hybrid power electronic transformer voltage failure described in step 3 is further comprising the steps of：
Step 3.1 calculates three phase separation formula hybrid power electronic transformer phase voltage vector uidq, wherein i=a, b,
c；
Step 3.2 calculates three phase separation formula hybrid power electronic transformer voltage deviation Δ ui, wherein i=a, b, c；
Step 3.3 judges three phase separation formula hybrid power electronic transformer voltage failure.
Three phase separation formula hybrid power electronic transformer dynamic voltage compensation and control described in step 4 also include following
Step：
Step 4.1 is to three phase separation formula hybrid power electronic transformer Double closed-loop of voltage and current；
Step 4.2 carries out reverse Clark conversion to three phase separation formula hybrid power electronic transformer；
Step 4.3 carries out PWM to three phase separation formula hybrid power electronic transformer output voltage.
Beneficial effects of the present invention：
The present invention provides a kind of three phase separation formula hybrid power electronic transformer and its control method, by using three-phase
The back-to-back converter of separate type H bridges, a single-phase full bridge circuit is often used in circuitry phase, is completely independent every circuitry phase, often
Phase loop reactive power can independent compensation and independent control, realize to the recovery of the reactive-current compensation and dynamic electric voltage of split-phase,
There is good regulation effect to the quality of power supply under uneven operating mode, the topological structure that the present invention uses increase effectively electric power
Electronic transformer capacity, it is set to realize powerful electric energy transmission, the present invention is by right while quality of power supply regulation and control are realized
Effective switching of series connection side converter is realized in the reasonable control of static switch, it is ensured that output voltage is unaffected under normal operation,
Influence of the harmonic wave to the quality of power supply caused by effectively reducing compensation circuit, ensure the stabilization of output voltage, furthermore, of the invention adopts
The structure connected back-to-back with series transformer and parallel connection converter DC side, it is not necessary to connect dc source, reduce topology
Complexity.
Brief description of the drawings
Fig. 1 is split-phase type hybrid power electronic transformer topological structure of the present invention；
Fig. 2 is bi-directional switch structure schematic diagram of the present invention；
Fig. 3 is parallel connection converter mathematical modeling of the present invention；
Fig. 4 is series transformer mathematical modeling of the present invention；
Fig. 5 is the control of reactive power compensating flow chart of the present invention；
Fig. 6 is voltage compensation flow chart of the present invention.
Embodiment
More detailed description is done to embodiments of the present invention below in conjunction with the accompanying drawings：
A kind of three phase separation formula hybrid power electronic transformer, including multiwinding transformer and the back-to-back converter of H bridges,
Described multiwinding transformer includes primary side winding, the first vice-side winding and the second vice-side winding, multiwinding transformer primary side around
Group is connected with 10kV power network triangles, and the first vice-side winding of multiwinding transformer is connected with the first by-pass switch, and described the
Bypass switch, filter inductance and the back-to-back converter of H bridges are sequentially connected, and the back-to-back converter of H bridges is connected with LC wave filters, more
Second vice-side winding of winding transformer is connected with the second by-pass switch and the 3rd by-pass switch respectively, and the described the 3rd bypass is opened
Close and connected with load, the second described by-pass switch is connected with static switch and LC wave filters respectively, static switch and LC filtering
Device is connected with the 4th by-pass switch respectively, and the 4th by-pass switch connects with load.
Multiwinding transformer includes ferromagnetic core, primary side winding, the first vice-side winding and the second vice-side winding, transformer it is each
Winding is wound on ferromagnetic core, and two vice-side windings of Multiple coil electromagnetic transformers include connecing for load winding and parallel connection converter
Enter winding, wherein the magnetic core of Multiple coil electromagnetic transformers, primary side winding coil and vice-side winding coil be fitted into dielectric resin or
Person is by inert gas or the environment of environmental gas encirclement.
The back-to-back converter of H bridges uses phase separation structure, is all separate between the back-to-back converter of H bridges per phase
In the absence of the connection on electrical structure, the back-to-back converter of H bridges in each phase is gone here and there by a parallel connection converter and one
Join converter composition, each parallel connection converter and series transformer include four bi-directional switch structures, described two-way switch
Structure is connected in parallel again after being connected in series two-by-two, and described bi-directional switch structure includes IGBT and backward dioded,
Described IGBT and backward dioded is connected in parallel, that is to say, that each parallel connection converter and current-limiting reactor include 4
IGBT and 4 anti-parallel diodes, 4 IGBT form a H full-bridge, and drawing AC among two bridge arms of H full-bridge connects
Wiring, DC side connecting line is drawn from the upper and lower ends of H bridges, the AC of parallel connection converter passes through filter inductance and by-pass switch
It is connected on one group of vice-side winding coil of three-phase multiwinding transformer, DC side is straight with series transformer by DC bus capacitor
Stream side is connected, and forms H bridge back to back structure, compared to traditional electric power electric transformer, is tied back-to-back as a result of H bridges
Structure, electric power electric transformer part no longer need to provide dc source, reduce the topology knot of hybrid power electronic transformer
Structure complexity, improves the operational reliability of three phase separation formula hybrid power electronic transformer, and H bridge parallel connection converters are main
Function be to provide reactive-load compensation electric current and maintain the stabilization of DC voltage, the parallel connection converter in the back-to-back converter of H bridges
Using current mode topological structure, its mathematical modeling is advantageous to the watt current and reactive current of simplify control output, parallel inverter
Direction and size of the device by the watt current of control output, maintain the stabilization of DC voltage, pass through and control the idle of output
The size and Orientation of electric current, realizes the reactive power compensation of three phase separation formula hybrid power electronic transformer, and H bridges become back-to-back
Series transformer in parallel operation uses voltage-type topological structure, and its mathematical modeling is advantageous to the voltage waveform of simplify control output,
By the control of the voltage waveform exported to series transformer, the dynamic compensation to load circuit output voltage is realized.
Described static switch be three phase static switch, per phase static switch by two reverse parallel connections thyristor groups into；
Static switch includes 3 independent static switches of a, b, c three-phase, and each static switch is made up of two IGCT reverse parallel connections,
On the load circuit of each static switch series connection access multiwinding transformer, it is in parallel with the outlet side of series transformer, when quiet
When state switch conduction, series transformer is bypassed, and the compensation of series transformer is not included in the load circuit voltage of output
Voltage, the higher hamonic wave that series transformer may be brought is avoided, when static switch disconnects, series transformer is linked into
In load circuit, by controlling the output voltage of series transformer to realize the voltage compensation in output loading loop, electricity is improved
The stability of net output voltage.A kind of three phase separation formula hybrid power electronic transformer, control method comprise the following steps：
Step 1：Measure three phase separation formula hybrid power electronic transformer voltage, electric current；
Step 2：Three phase separation formula hybrid power electronic transformer reactive power is calculated, compensation electric current is controlled；
Step 3：Detect three phase separation formula hybrid power electronic transformer voltage failure；
Step 4：Three phase separation formula hybrid power electronic transformer dynamic voltage compensation and control.
Measurement three phase separation formula hybrid power electronic transformer voltage, electric current described in step 1 is further comprising the steps of：
Step 1.1 measures the voltage u of load circuita、ub、uc, load circuit electric current ia、ib、ic；
Step 1.2 measures the output current i of parallel connection converterLpa、iLpb、iLpcAnd the output current i of series transformerLa、
iLb、iLc；
Step 1.3 measures the capacitance current i of series transformersa、isb、isc, capacitance voltage uga、ugb、ugc；
Step 1.4 by the voltage of the load circuit of measurement, electric current, the output current of parallel connection converter and series transformer with
And the capacitance current and capacitance voltage of series transformer carry out Clark conversion：Using the voltage x current collected as virtual a phases
Value, the value of the three/a cycle of reach of the value of virtual a phases on a timeline is worth as virtual b phases, reach three parts it
The value in two cycles is worth as virtual c phases, and the value of virtual abc three-phases is converted by single-phase Clark, obtains load circuit electricity
The value u being pressed under single-phase dq coordinate systemsad、uaq、ubd、uaq、ucd、ucq, load circuit electric current iad、iaq、ibd、ibq、icd、icq, and
Join converter output current iLpad、iLpaq、iLpbd、iLpbq、iLpcd、iLpcq, series transformer output current iLad、iLaq、iLbd、
iLbq、iLcd、iLcq, capacitance current isad、isaq、isbd、isbq、iscd、iscq, capacitance voltage ugad、ugaq、ugbd、ugbq、ugcd、ugcq。
Calculating three phase separation formula hybrid power electronic transformer reactive power described in step 2, compensation electric current is carried out
Control further comprising the steps of：
Step 2.1 calculates three phase separation formula hybrid power electronic transformer Single Phase Reactive Currents iid、iiq；
Step 2.2 calculates three phase separation formula hybrid power electronic transformer reactive-load compensation electric current Δ iiq, wherein i=a, b,
c；According to single-phase idle instantaneous theoretical, its instantaneous reactive power value Qi=1.5 (- uiqiid+uidiiq)(uiq、uidFor three-phase voltage
Output valve, i=a, b, c), according to current reactive current, the limitation of reactive-current compensation coefficient, reactive compensation capacity, calculate
Reactive-load compensation electric current Δ iiq(i=a, b, c)；
Step 2.3 carries out closed-loop control to reactive-load compensation electric current：In order to maintain split-phase type hybrid power electronic transformer
In dc-voltage balance, with DC voltage rated value ur c e apF is as command value, DC side virtual voltage ucapAs feedback
Value carries out PI controls, and its output result is as watt current command value, to realize the purpose of DC-side Voltage Stabilization.
Detection three phase separation formula hybrid power electronic transformer voltage failure described in step 3 is further comprising the steps of：
Step 3.1 calculates three phase separation formula hybrid power electronic transformer phase voltage vector uidq, wherein i=a, b,
c；
Step 3.2 calculates three phase separation formula hybrid power electronic transformer voltage deviation Δ ui, wherein i=a, b, c；
Step 3.3 judges three phase separation formula hybrid power electronic transformer voltage failure：By phase voltage vector uidqAnd root
According to the load voltage value u of setting0The deviation voltage Δ u of phase voltage can be obtainedi(i=a, b, c), according to the voltage failure of setting
Whether threshold decision voltage failure occurs, and when voltage failure occurs, activates static switch control signal S, control series connection conversion
Device is linked into load circuit output voltage.
Three phase separation formula hybrid power electronic transformer dynamic voltage compensation and control described in step 4 also include following
Step：
Step 4.1 is to three phase separation formula hybrid power electronic transformer Double closed-loop of voltage and current；With voltage failure
The deviation voltage Δ u that detection obtainsiThe set-point of (i=a, b, c) as d axle command voltages, electricity is instructed using 0 as q axles
The set-point of pressure, adjust to obtain inner ring d axle control instruction electric currents by carrying out PI to the outer loop voltag of d axles and q axlesWith q axles
Control electric current(i=a, b, c).By d axles and the instruction current of q axles(i=a, b, c), and the reality of d axles and q axles
Electric current iLid、iLiq(i=a, b, c) carries out closed loop proportional and controls the control voltage exported；
Step 4.2 carries out reverse Clark conversion to three phase separation formula hybrid power electronic transformer；To inverter control
Voltage carries out single-phase dq0/abc conversion, obtains i phases (i=a, b, c) IGBT control voltage
Step 4.3 carries out PWM to three phase separation formula hybrid power electronic transformer output voltage.
In order to be fully understood by proposed three phase separation formula hybrid power electronic transformer topological structure, quantify its electric energy
Quality control performance, abc three-phase static coordinate systems are established to the series transformer in the back-to-back converter of H bridges and parallel connection converter
Mathematical modeling under lower and dq two-phase rotating coordinate systems, as shown in Figure 3 and Figure 4, due to three phase separation formula hybrid power electronics
Transformer employs split-phase topological structure, can both be rotated based on the mathematical modeling under abc three-phase static coordinate systems and dq two-phases
The method that three-phase is uniformly controlled is established under coordinate system, mathematical modeling and single-phase dq under dq two-phase rotating coordinate systems can also be utilized to become
Change and virtual dq0 coordinate systems are established in single-phase, realize single-phase virtual dq controls, no matter be uniformly controlled corresponding to three-phase or split-phase
Control, the mathematical modeling of foundation is identical.
Mathematical modeling of the parallel connection converter under abc rest frames is in the back-to-back converter of H bridges：
Wherein LsIt is the filter inductance of parallel connection converter, isi(i=a, b, c) is that parallel connection converter is injected into transformer
Three-phase current, usi(i=a, b, c) is the three-phase voltage of transformer secondary winding, una(i=a, b, c) is parallel connection converter exchange
The three-phase voltage value of side；To the parallel inverter under abc three-phase static coordinate systems
The mathematical modeling of device carries out Clark and converts the mathematical modeling that can be obtained under dq rotating coordinate systems：
Wherein i=a, b, c, LsIt is the filter inductance of parallel connection converter, iLpid、iLpiqBe parallel connection converter i phases (i=a, b,
C) electric current of d axles and q axles, u under single-phase virtual dq coordinate systemssid、usiqIt is parallel connection converter i phases (i=a, b, c) in single-phase void
Intend the voltage on line side of d axles and q axles under dq coordinate systems, unip、uniqIt is that parallel connection converter i phases (i=a, b, c) are sat in single-phase virtual dq
The output voltage of the lower d axles of mark system and q axles, ω is electrical network angular frequency, and the number of parallel connection converter as shown in Figure 3 can be obtained by the equation
Learn model.
Control block diagram for parallel connection converter is as shown in figure 5, the voltage x current that i phases are detected to obtain makees single-phase dq0/
Abc converts obtained voltage usidAnd usiqWith electric current iLpid, iLpiq, reactive current Q is calculated under single-phase dq coordinate systemsi=
1.5(-usiqiLpid+usidiLpiq), by reactive power Qi, reactive-load compensation ratio and reactive compensation capacity limitation be calculated it is idle
Compensate electric current Δ iq, with Δ iqCommand value as parallel connection converter reactive current.In order to maintain split-phase type hybrid power electronics
Dc-voltage balance in transformer, with DC voltage rated valueAs command value, DC side virtual voltage ucapAs
Value of feedback carries out PI controls, and its output result is as watt current command value, to realize the purpose of DC-side Voltage Stabilization.
It is accurately controlled to be realized to parallel connection converter, decoupling control is carried out to the electric current under single-phase virtual dq coordinate systems
System, single-phase virtual dq shaft currents are controlled, the output current of parallel connection converter is followed given electric current, the side adjusted using closed loop PI
Formula, its governing equation are：
Wherein i=a, b, c, KpIt is proportionality coefficient, KiIt is integral coefficient.The governing equation corresponds to the idle benefit shown in Fig. 2
Repay the single-phase closed-loop control in flow.
Mathematical modeling of the series transformer under abc rest frames is in the back-to-back converter of H bridges：
Wherein umi(i=a, b, c) is the output voltage of series transformer AC, ugi(i=a, b, c) is series connection conversion
The grid-connected voltage that device entered after LC wave filters, iLi(i=a, b, c) is the inductance output current of series transformer, isi(i=a, b,
C) it is electric current that LC wave filters flow through electric capacity, LsIt is LC filter inductances, CsIt is LC filter capacities；To abc three phase static coordinates
Series transformer mathematical modeling under system carries out Clark and converts the mathematical modeling that can be obtained under dq rotating coordinate systems：
Wherein i=a, b, c, LsIt is the inductance in LC wave filters, CsIt is the electric capacity in LC wave filters, iLid、iLiqIt is iLi(i
=a, b, c) be by LC filter inductances electric current by single-phase Clark conversion after value, isid、isiqIt is isi(i=a, b, c) is
Flow out value of the electric current of LC wave filters after single-phase Clark conversion, umid、umiqIt is umi(i=a, b, c) is that series transformer is defeated
Go out value of the three-phase voltage of side after single-phase Clark conversion, ugid、ugiqIt is ugi(i=a, b, c) is after LC wave filters
Value of the output voltage after single-phase Clark conversion.
The series transformer model shown in Fig. 4 can be obtained from the mathematical modeling under dq rotating coordinate systems, is converted by series connection
The voltage x current value that the mathematical modeling of device can export to series transformer is accurately controlled, and design is applied to series connection conversion
The control method of device and parallel connection converter, realize reactive current imbalance compensation controller and dynamic voltage compensation controller.
Control block diagram to series transformer is as shown in fig. 6, the voltage that i phases are detected to obtain converts to obtain as dq0/abc
Voltage usidAnd usiq, the voltage vector and u of calculating i phase voltagessidq, calculate i phase voltage vectors and rated voltage u0Between electricity
Pressure difference Δ ui, with voltage difference Δ uiDouble closed-loop of voltage and current is carried out as d axles command voltage, q shaft voltage command values are
0, Double closed-loop of voltage and current is carried out to series transformer.
Claims (10)
1. a kind of three phase separation formula hybrid power electronic transformer, including multiwinding transformer and the back-to-back converter of H bridges, its
It is characterised by：Described multiwinding transformer includes primary side winding, the first vice-side winding and the second vice-side winding, Multiple coil transformation
Device primary side winding is connected with 10kV power network triangles, and the first vice-side winding of multiwinding transformer is connected with the first by-pass switch,
Described the first by-pass switch, filter inductance and the back-to-back converter of H bridges is sequentially connected, and the back-to-back converter of H bridges filters with LC
Device is connected, and the second vice-side winding of multiwinding transformer is connected with the second by-pass switch and the 3rd by-pass switch respectively, described
3rd by-pass switch is connected with load, and the second described by-pass switch is connected with static switch and LC wave filters respectively, and static state is opened
Close and LC wave filters are connected with the 4th by-pass switch respectively, the 4th by-pass switch connects with load.
A kind of 2. three phase separation formula hybrid power electronic transformer according to claim 1, it is characterised in that：Described
The back-to-back converter of H bridges is phase separation structure, independent mutually per the back-to-back converter of phase H bridges, per the back-to-back converter bag of phase H bridges
A parallel connection converter and a series transformer are included, described parallel connection converter and series transformer are connected in parallel.
A kind of 3. three phase separation formula hybrid power electronic transformer according to claim 1, it is characterised in that：Described
Static switch switchs for three phase static, includes two reverse IGCTs per phase static switch, described two reverse IGCTs are simultaneously
Connection connection.
A kind of 4. three phase separation formula hybrid power electronic transformer according to claim 2, it is characterised in that：Each simultaneously
Connection converter and series transformer include four bi-directional switch structures, described bi-directional switch structure be connected in series two-by-two after again
It is connected in parallel.
A kind of 5. three phase separation formula hybrid power electronic transformer according to claim 4, it is characterised in that：Described
Bi-directional switch structure includes IGBT and backward dioded, and described IGBT and backward dioded are connected in parallel.
A kind of 6. three phase separation formula hybrid power electronic transformer, it is characterised in that：Control method comprises the following steps：
Step 1：Measure three phase separation formula hybrid power electronic transformer voltage, electric current；
Step 2：Three phase separation formula hybrid power electronic transformer reactive power is calculated, compensation electric current is controlled；
Step 3：Detect three phase separation formula hybrid power electronic transformer voltage failure；
Step 4：Three phase separation formula hybrid power electronic transformer dynamic voltage compensation and control.
7. three phase separation formula hybrid power electronic transformer according to claim 6, it is characterised in that：Described in step 1
Measurement three phase separation formula hybrid power electronic transformer voltage, electric current it is further comprising the steps of：
Step 1.1 measures the voltage u of load circuita、ub、uc, load circuit electric current ia、ib、ic；
Step 1.2 measures the output current i of parallel connection converterLpa、iLpb、iLpcAnd the output current i of series transformerLa、iLb、
iLc；
Step 1.3 measures the capacitance current i of series transformersa、isb、isc, capacitance voltage uga、ugb、ugc；
Step 1.4 is by the voltage of the load circuit of measurement, electric current, the output current and string of parallel connection converter and series transformer
The capacitance current and capacitance voltage for joining converter carry out Clark conversion.
A kind of 8. three phase separation formula hybrid power electronic transformer according to claim 6, it is characterised in that：Step 2
Described calculating three phase separation formula hybrid power electronic transformer reactive power, compensation electric current is controlled also including following
Step：
Step 2.1 calculates three phase separation formula hybrid power electronic transformer Single Phase Reactive Currents iid、iiq；
Step 2.2 calculates three phase separation formula hybrid power electronic transformer reactive-load compensation electric current Δ iiq, wherein i=a, b, c；
Step 2.3 carries out closed-loop control to reactive-load compensation electric current.
A kind of 9. three phase separation formula hybrid power electronic transformer according to claim 6, it is characterised in that：Step 3
Described detection three phase separation formula hybrid power electronic transformer voltage failure is further comprising the steps of：
Step 3.1 calculates three phase separation formula hybrid power electronic transformer phase voltage vector uidq, wherein i=a, b, c；
Step 3.2 calculates three phase separation formula hybrid power electronic transformer voltage deviation Δ ui, wherein i=a, b, c；
Step 3.3 judges three phase separation formula hybrid power electronic transformer voltage failure.
A kind of 10. three phase separation formula hybrid power electronic transformer according to claim 6, it is characterised in that：Step 4
Described three phase separation formula hybrid power electronic transformer dynamic voltage compensation and control is further comprising the steps of：
Step 4.1 is to three phase separation formula hybrid power electronic transformer Double closed-loop of voltage and current；
Step 4.2 carries out reverse Clark conversion to three phase separation formula hybrid power electronic transformer；
Step 4.3 carries out PWM to three phase separation formula hybrid power electronic transformer output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711101070.6A CN107611992A (en) | 2017-11-10 | 2017-11-10 | A kind of three phase separation formula hybrid power electronic transformer and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711101070.6A CN107611992A (en) | 2017-11-10 | 2017-11-10 | A kind of three phase separation formula hybrid power electronic transformer and its control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107611992A true CN107611992A (en) | 2018-01-19 |
Family
ID=61086344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711101070.6A Pending CN107611992A (en) | 2017-11-10 | 2017-11-10 | A kind of three phase separation formula hybrid power electronic transformer and its control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107611992A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242813A (en) * | 2018-02-02 | 2018-07-03 | 山东电力设备有限公司 | The energy router and its control method of power quality harnessed synthetically and power optimization |
| CN114123337A (en) * | 2021-12-01 | 2022-03-01 | 湖南大学 | Hybrid multifunctional grid-connected converter of power distribution network and optimized operation control method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599187A (en) * | 2004-09-10 | 2005-03-23 | 清华大学 | Electric energy mass and powerless compensation combination controller |
| CN1862906A (en) * | 2006-06-01 | 2006-11-15 | 西安交通大学 | Series active AC voltage quality regulator and controlling method |
| CN103618310A (en) * | 2013-12-05 | 2014-03-05 | 国家电网公司 | High-capacity UPQC and control method thereof |
| CN104362651A (en) * | 2014-11-27 | 2015-02-18 | 哈尔滨理工大学 | Three-phase imbalance downward cascade type H-bridge static synchronous reactive compensation device and compensation method |
| CN106451428A (en) * | 2016-10-18 | 2017-02-22 | 国网浙江省电力公司电力科学研究院 | Hybrid type unified power quality conditioner with short circuiting current limiting function |
| CN106655805A (en) * | 2017-03-10 | 2017-05-10 | 贵州电网有限责任公司电力科学研究院 | MMC-based multi-port hybrid power electronic transformer and control method thereof |
| 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 |
-
2017
- 2017-11-10 CN CN201711101070.6A patent/CN107611992A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1599187A (en) * | 2004-09-10 | 2005-03-23 | 清华大学 | Electric energy mass and powerless compensation combination controller |
| CN1862906A (en) * | 2006-06-01 | 2006-11-15 | 西安交通大学 | Series active AC voltage quality regulator and controlling method |
| CN103618310A (en) * | 2013-12-05 | 2014-03-05 | 国家电网公司 | High-capacity UPQC and control method thereof |
| CN104362651A (en) * | 2014-11-27 | 2015-02-18 | 哈尔滨理工大学 | Three-phase imbalance downward cascade type H-bridge static synchronous reactive compensation device and compensation method |
| CN106451428A (en) * | 2016-10-18 | 2017-02-22 | 国网浙江省电力公司电力科学研究院 | Hybrid type unified power quality conditioner with short circuiting current limiting function |
| CN106655805A (en) * | 2017-03-10 | 2017-05-10 | 贵州电网有限责任公司电力科学研究院 | MMC-based multi-port hybrid power electronic transformer and control method thereof |
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| 《中国优秀硕士学位论文全文数据库 工程科技II辑》: ""统一电能质量控制器的仿真及实验研究"" * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242813A (en) * | 2018-02-02 | 2018-07-03 | 山东电力设备有限公司 | The energy router and its control method of power quality harnessed synthetically and power optimization |
| CN108242813B (en) * | 2018-02-02 | 2021-08-24 | 山东电力设备有限公司 | Control method of energy router for comprehensive treatment of electric energy quality and power optimization |
| CN114123337A (en) * | 2021-12-01 | 2022-03-01 | 湖南大学 | Hybrid multifunctional grid-connected converter of power distribution network and optimized operation control method thereof |
| CN114123337B (en) * | 2021-12-01 | 2024-02-09 | 湖南大学 | Hybrid multifunctional grid-connected converter of power distribution network and optimal operation control method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105490552B (en) | A kind of solid-state transformer and control method based on MMC | |
| JP6181132B2 (en) | Power converter | |
| CN108493967B (en) | Voltage balance control method of microgrid inverter under unbalanced load condition | |
| CN105553304B (en) | A kind of modular multilevel type solid-state transformer and its internal model control method | |
| CN103701350A (en) | Modular multi-level converter capacitor voltage fluctuation inhibition method under low-frequency working condition | |
| CN103904909A (en) | Double-PWM frequency converter integrated coordinated control system based on fractional order control | |
| CN108233403B (en) | MMC double-loop circulating current restraining method based on quasi-proportional resonant regulator | |
| CN106533189A (en) | Power electronic transformer and control method thereof | |
| CN101795080A (en) | Three-phase power electronics transformer for power distribution | |
| CN103606926A (en) | High-capacity unified power quality conditioner based on chain structure and control method thereof | |
| CN107623456A (en) | Multiport electric power electric transformer topology and its control method based on MMC | |
| WO2015143744A1 (en) | Multi-port dc-dc autotransformer and application therefor | |
| CN104993713A (en) | Control method for double PWM solid-state transformer | |
| CN101291057B (en) | Dynamic voltage compensator adopting 3 phase structure | |
| CN102545675B (en) | Hybrid series H-bridge multi-level grid-connected inverter direct current bus voltage control method | |
| CN110350547A (en) | A kind of more level reactive compensation systems and its control method suitable for unbalanced load | |
| CN110618319B (en) | Device for measuring dq impedance of VSC type electric locomotive and control method thereof | |
| CN205389177U (en) | Novel many level of modularization type solid -state transformer | |
| CN207460027U (en) | Isolation type bidirectional DC/AC power supplys | |
| CN207339288U (en) | A kind of three phase separation formula hybrid power electronic transformer | |
| CN102347707A (en) | Three-phase inverter control system and control method thereof | |
| CN201061144Y (en) | Dynamic voltage compensator using three single-phase structure | |
| CN111177932B (en) | Modeling method for improving electromagnetic transient simulation speed of flexible substation | |
| CN107565580A (en) | Hybrid power electronic transformer and control method with fault tolerance | |
| CN107611992A (en) | A kind of three phase separation formula hybrid power electronic transformer and its control method |
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 |