CN105048788B - The multiport electric power electric transformer and its control method of a kind of Mixed cascading structure - Google Patents
The multiport electric power electric transformer and its control method of a kind of Mixed cascading structure Download PDFInfo
- Publication number
- CN105048788B CN105048788B CN201510303788.8A CN201510303788A CN105048788B CN 105048788 B CN105048788 B CN 105048788B CN 201510303788 A CN201510303788 A CN 201510303788A CN 105048788 B CN105048788 B CN 105048788B
- Authority
- CN
- China
- Prior art keywords
- voltage
- rectification
- module
- level
- power
- 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.)
- Active
Links
Landscapes
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of multiport electric power electric transformer of Mixed cascading structure, electric power electric transformer includes rectification stage, intermediate isolating level, rectification stage is formed by M Mixed cascading module-cascade, Mixed cascading module includes H bridges rectification module and n submodule, the input of H bridge rectification modules after cascade by accessing power network, the input of module after the output end of H bridge rectification modules and the n sub- block coupled in series is connected, and the input of the output end of M*n submodule respectively with corresponding isolation module is connected；Direct current output port of the output port of M*n isolation module all as electric power electric transformer, direct current output port voltage class and output capacity connection in series-parallel needed for.The invention is particularly suited to high-tension electricity to transform to multiport low-voltage applications；It disclosure satisfy that under identical DC terminal quantity, number of devices is reduced, significantly cost-effective；Complete modular structure make it that capacity expansion is good.
Description
Background technology
In recent years, it is a kind of to pass through electric power electricity with the development of device for high-power power electronic technology and modern control theory
The equipment that sub- technology realizes transformation of electrical energy --- electric power electric transformer (Power Electronic Transformer, PET)
Just increasingly paid attention to by domestic and foreign scholars.The electric power electric transformer equipment investment for power distribution network is run at present.
PET is had broad application prospects due to its high controllability, high power supply quality and the few good characteristic of harmonic wave.But existing structure
Electric power electric transformer there is also some shortcomings, the application under particularly more power supply occasions.
Traditional more level topological structures, with the increase of level number and DC port, required power electronic devices with
And the complexity of topology will all greatly increase.And in the present invention, devise the multiport electric power electricity based on Mixed cascading structure
Sub- transformer, cascaded H-bridges are connected with multiple direct current output submodules, transformed to particularly suitable for high voltage compared with low dc voltage or
The more application scenario of DC side electric current number demand, such as distributed energy storage system, charging electric vehicle.Prime rectifier bridge arm
Voltage change ratio (dv/dt) and current changing rate (di/dt) are all relatively low, and the voltage stress that switching device is born is small, and DC side
Pressure voltage, capacity and the volume of electric capacity greatly reduce.AC level number is more than conventional electric power electronic transformer, and each harmonic contains
There are rate and total harmonic distortion factor to be greatly reduced, so as to reduce or even save the alternating current filter of Large Copacity.Full modularization
Structure also cause capacity expand and Redundancy Design it is more easy.
Existing technical scheme one：It is whole including modular multilevel rectifier, isolation level and inverter, modular multilevel
Stream device includes multiple submodule, and inverter includes multiple power conversion modules being connected in parallel with each other.The shortcomings that prior art one：
(1) high-pressure side level number is few, and harmonic content is higher.(2) inverter circuit includes multiple power conversion modules, device redundancy, into
This height.
Existing technical scheme one：It is whole including modular multilevel rectifier, isolation level and inverter, modular multilevel
Stream device includes multiple submodule, and inverter includes multiple power conversion modules being connected in parallel with each other.The shortcomings that prior art one：
(1) high-pressure side level number is few, and harmonic content is higher.(2) inverter circuit includes multiple power conversion modules, device redundancy, into
This height.
The content of the invention
Become in order to solve the above technical problems, the present invention provides a kind of multiport power electronics based on Mixed cascading structure
Depressor and its control method.
Technical scheme is as follows：
A kind of multiport electric power electric transformer of Mixed cascading structure, it is characterised in that：The electric power electric transformer
Topological structure includes rectification stage and intermediate isolating level, and rectification stage includes M Mixed cascading module, and the Mixed cascading module includes
The module that one H bridges rectification module and n sub- block coupled in series being attached thereto form, intermediate isolating level include M*n isolation mode
Block；Input of the input of H bridge rectification modules as Mixed cascading module, the input of the H bridges rectification module pass through level
Power network, two inputs of the module that the output end of the H bridges rectification module and the n sub- block coupled in series form are accessed after connection
Connection, the output end of the output end of each submodule as Mixed cascading module, each submodule have two output ends, M*n
Input of the output end of individual rectification submodule respectively with corresponding isolation module connects；The M*n isolation module
DC output end of the output end as electric power electric transformer, DC output end voltage class and output capacity string needed for
It is in parallel；
The submodule includes half-bridge circuit and electric capacity, and the half-bridge circuit is in parallel with the electric capacity.
A kind of multiport electric power electric transformer of described Mixed cascading structure, it is characterised in that：It is inverse also to include DC-AC
Become device, described direct current output port is in parallel to form dc bus, and the dc bus accesses the DC-AC inverter direct current
Side, described DC-AC inverter AC connection low-voltage alternating-current power network.
A kind of multiport electric power electric transformer of described Mixed cascading structure, it is characterised in that：Described DC-AC is inverse
Becoming device includes full bridge inverter and LC filter circuits, and described inverter circuit is by storage capacitor and six band anti-paralleled diodes
IGBT form, described storage capacitor includes higher level's electric capacity and subordinate's electric capacity, and higher level's electric capacity and subordinate's electric capacity are series relationship.
Described isolation module is included by inverter circuit, intermediate-frequency transformer, rectification circuit, described inverter circuit input
It is connected respectively with the submodule output end of described rectification stage；Described intermediate-frequency transformer high-pressure side exports with inverter circuit respectively
End connection；Described rectification circuit is connected with intermediate-frequency transformer low-pressure side respectively.
Described inverter circuit is single-phase full bridge inverter circuit, and described inverter circuit is by four with anti-paralleled diode
IGBT is formed；Described rectification circuit is full bridge rectifier, and described rectification circuit is by four with anti-paralleled diode
IGBT is formed.
The control method of the rectification stage comprises the following steps：
Step S1, obtain High Level AC Voltage net side electric current Is；
Step S2, obtain each submodule VD Udc1, Udc2 ... Udcn of rectification stage；
Step S3, calculate High Level AC Voltage net side current reference value Is*；
Step S4, according to grid side current reference value Is*And High Level AC Voltage net side current sampling data Is is to rectification stage H
Bridge rectification module carries out closed-loop control；
Step S5, calculate each submodule VD average value V_ref of rectification stage；
Step S6, according to each submodule direct current output average voltage V_ref and each submodule output voltage Udc1, Udc2 ...
Udcn carries out closed-loop control to rectification submodule respectively.
The step S3 includes：
Step S31, summed according to submodule VD Udc1, Udc2 ... Udcn, obtain DC side total voltage
Step S32, according to DC side total voltageEnter with n times of each module DC voltage reference value Udc_ref
Row closed-loop control obtains the amplitude is of ac-side current reference value；
Step S33, high-pressure side instantaneous voltage Us phase is obtained by PLL phaselocked loops；
Step S34, circuit is occurred by sine and obtains the sinusoidal signal Sinwt with Us same-phases；
Step S35, sinusoidal signal Sinwt is multiplied with the amplitude is of ac-side current reference value, obtains High Level AC Voltage
Current on line side reference value Is*。
The control method of the intermediate isolating level comprises the following steps：
Step S1, obtain low-pressure side VD Uco；
Step S2, obtain each isolation module low-voltage direct side output current id1, id2 ... idn；
Step S3, according to low-pressure side VD reference value Uco*Closed with low-pressure side VD Uco
Ring controls to obtain the total power that isolation module is connected after each Mixed cascading module, by power summation divided by n, obtains each intermediate frequency
Transformer efficiency reference value PDAB；
Step S4, each isolation module low-voltage direct side output current id1, id2 ... idn pass through low pass filter LPF, obtained
Output current calculated value
Step S5, according to low-pressure side VD Uco and output current calculated valuePass through
Power calculation unit obtains each intermediate-frequency transformer power PDAB1、PDAB2…PDABn；
Step S6, according to intermediate-frequency transformer value and power reference PDABWith each intermediate-frequency transformer power PDAB1、PDAB2…PDABnEnter
Row closed-loop control obtains each isolation module phase-shift control angle
A kind of multiport electric power electric transformer of described Mixed cascading structure, it is characterised in that：Its control circuit bag
Include：
Rectification stage first control circuit, for controlling H bridge rectification modules；
Rectification stage second control circuit, for controlling rectification stage submodule；
The power calculation circuit of intermediate isolating level first, for calculating intermediate isolating level modular power.
The rectification stage first control circuit includes：
Total voltage combiner circuit, calculate rectification stage DC side total voltageAnd willExport to electricity
Press outer shroud PI controllers and described rectification stage second control circuit；
Reference voltage amplifying circuit, each module DC voltage reference value U_ref is amplified n times, and be sent to outside voltage
Ring PI controllers；
PLL phase-locked loop circuits, for obtaining instantaneous voltage Us phase；
Circuit occurs for sine, be connected with the PLL phaselocked loops, for the Us phases obtained according to PLL phaselocked loops, obtain and
Sinusoidal signal Sinwts of the Us with phase；
Outer voltage PI controllers, for DC side total voltage and n times of each submodule DC side reference voltage Udc_ref
Difference carry out PI regulations, obtain High Level AC Voltage net side current reference value Is*；
Current inner loop P controller, for High Level AC Voltage net side electric current Is and High Level AC Voltage net side current reference value
Is* difference carries out P regulations, obtains Cascade H bridge module modulated signal.
The rectification stage second control circuit includes：
Division circuit, for calculating each submodule direct current output average voltage V_ref；
PI controllers, for direct current output average voltage V_ref and each submodule VD Udc1, Udc2 ...
Udcn difference carries out PI regulations, obtains each submodule modulated signal.
The power calculation circuit of intermediate isolating level first, including：
Low pass filter LPF, for pulsed DC signal id1, id2 ... idn to be transformed into continuous direct current signal
Power calculation unit, by Uco respectively withIt is multiplied, calculates each isolation level transmission
Power；
The PI controllers of intermediate isolating level the first, for low-pressure side VD Uco and low-pressure side direct current output is electric
Press the difference of reference value to carry out PI controls, obtain the general power reference value of intermediate isolating level transmission, itself divided by n are obtained each
The reference value P of intermediate isolating level transimission powerDAB；
The PI controllers of intermediate isolating level the 2nd, for the power P for transmitting each intermediate isolating levelDAB1、PDAB2…PDABnWith
The reference value P of intermediate isolating level transimission powerDABDifference carry out PI regulations, obtain each isolation module phase-shift control angle
Relative to prior art, technical solution of the present invention has the beneficial effect that：
(1) Mixed cascading topological structure is used, multiport low-voltage applications are transformed to particularly suitable for high-tension electricity；
(2) remove and realize conventional electric power electronic transformer function, moreover it is possible to meet under identical DC terminal quantity, power electronic devices
A large amount of reductions, it is significantly cost-effective；
(3) dc source is more after rectification, and voltage is small, can reduce electric capacity pressure voltage, reduces electric capacity volume；
(4) just capacitance voltage can be made to reach balance using simple algorithm；
(5) complete modular structure causes capacity to expand more convenient, and submodule quantity increases and decreases according to demand.
Brief description of the drawings
Fig. 1 is the system construction drawing of a preferred embodiment of the present invention；
Fig. 2 is the Mixed cascading function structure chart of a preferred embodiment of the present invention；
Fig. 3 is the intermediate isolating level structure figure of a preferred embodiment of the present invention；
Fig. 4 is the two close cycles control of the outer voltage current inner loop of the Mixed cascading module of a preferred embodiment of the present invention
Block diagram processed；
Fig. 5 is the power closed loop phase shifting control block diagram of the intermediate isolating level of a preferred embodiment of the present invention；
Fig. 6 is the double-closed-loop control frame of the outer voltage current inner loop of the inverter of a preferred embodiment of the present invention
Figure；
Embodiment
Technical scheme is further illustrated below in conjunction with the accompanying drawings.
Shown in Fig. 1, a kind of multiport electric power electric transformer of Mixed cascading structure is made up of tertiary structure, rectification stage,
Intermediate isolating level and output stage.Rectification stage is Mixed cascading structure, wherein the High Level AC Voltage inputted obtains through H bridge cascade rectifiers
To unstable DC voltage, then the balance charge/discharge by each submodule, reach the in a basic balance of capacitance voltage.Middle interval
Be two-way full-bridge converter (DAB) from level, control energy flow, wherein intermediate-frequency transformer (MFT) realize voltage class conversion and
Buffer action, MFT leakage reactance need to be sufficiently large, so as to meet the phase shift of primary and secondary side voltage required under rated power.DAB
Output port is direct current electricity output, can be independently accessed electric automobile charging pile, photovoltaic system, dc source, DC energy storage system
Deng dc bus in parallel can also be formed, so as to form multiport output.Direct current output port can according to required voltage class and
The free connection in series-parallel of output capacity, flexible adaptation different application occasion.DC/AC inverters are accessed in dc bus, exchange can be formed
Output, powered for AC system.It is three-phase full-bridge inverter wherein to exchange output par, c, and DC side is by two electric capacity series connection groups
Into respectively higher level's electric capacity and subordinate's electric capacity.Power circuit is three-phase full-bridge inverting circuit, accessible distribution after filtered.
Its operation principle is：High Level AC Voltage obtains steady dc voltage after cascaded H-bridges and submodule rectification, real
The now balance charge/discharge of each submodule, reaches the in a basic balance of capacitance voltage, maintains the constant of every grade of DC voltage, and control
High-pressure side alternating current harmonic wave and power factor.Intermediate isolating level by the DC voltage on submodule electric capacity be depressured and every
From all power devices all use wholly-controled device in DAB topological structures, can realize flow of power seamless control.Wattful power
The rate single-phase full bridge advanced from phase angle flow to the single-phase full bridge of phase angular lag, and watt level is by phase angle difference and DAB two
Hold DC voltage magnitude difference to determine, the stabilization of DC port output voltage or the perseverance of transimission power are kept by closed-loop control
It is fixed.So as to which DC port can be used as electric automobile charging pile, photovoltaic system, dc source, DC energy storage system and DC load
The interface of system, also direct current can be become by three-phase alternating current by DC/AC inverters, supply three-phase alternating current system.
The control circuit of the multiport electric power electric transformer of Mixed cascading structure specifically includes：
Rectification stage first control circuit, for controlling H bridge rectification modules；Rectification stage second control circuit, it is whole for controlling
Flow level submodule；The power calculation circuit of intermediate isolating level first, for calculating intermediate isolating level modular power.
The rectification stage first control circuit includes：
Total voltage combiner circuit, calculate rectification stage DC side total voltageAnd willExport outside to voltage
Ring PI controllers and described rectification stage second control circuit；
Reference voltage amplifying circuit, each module DC voltage reference value U_ref is amplified n times, and be sent to outside voltage
Ring PI controllers；
PLL phase-locked loop circuits, for obtaining instantaneous voltage Us phase；
Circuit occurs for sine, be connected with the PLL phaselocked loops, for the Us phases obtained according to PLL phaselocked loops, obtain and
Sinusoidal signal Sinwts of the Us with phase；
Outer voltage PI controllers, for DC side total voltage and n times of each submodule DC side reference voltage Udc_ref
Difference carry out PI regulations, obtain High Level AC Voltage net side current reference value Is*；
Current inner loop P controller, for High Level AC Voltage net side electric current Is and High Level AC Voltage net side current reference value
Is* difference carries out P regulations, obtains Cascade H bridge module modulated signal.
The rectification stage second control circuit includes：
Division circuit, for calculating each submodule direct current output average voltage V_ref；
PI controllers, for direct current output average voltage V_ref and each submodule VD Udc1, Udc2 ...
Udcn difference carries out PI regulations, obtains each submodule modulated signal.
The power calculation circuit of intermediate isolating level first, including：
Low pass filter LPF, for pulsed DC signal id1, id2 ... idn to be transformed into continuous direct current signal
Power calculation unit, by Uco respectively withIt is multiplied, calculates each isolation level transmission
Power；
The PI controllers of intermediate isolating level the first, for low-pressure side VD Uco and low-pressure side direct current output is electric
Press the difference of reference value to carry out PI controls, obtain the general power reference value of intermediate isolating level transmission, itself divided by n are obtained each
The reference value P of intermediate isolating level transimission powerDAB；
The PI controllers of intermediate isolating level the 2nd, for the power P for transmitting each intermediate isolating levelDAB1、PDAB2…PDABnWith
The reference value P of intermediate isolating level transimission powerDABDifference carry out PI regulations, obtain each isolation module phase-shift control angle
The specific implementation process of rectification stage, intermediate isolating level and output stage is as follows：
(1) rectification stage
Rectification stage controls as shown in figure 4, it is by outer shroud direct current total voltage adjuster, inner ring current controller, submodule electricity
Press the link compositions such as adjuster, Phase-Locked Synchronous link and trigger pulse generation.Inner ring current controller realizes transverter AC
The direct control of current waveform and phase, with quick track reference electric current.Outer shroud direct current total voltage is controlled then according to system-level control
Realization of goal constant DC voltage control processed.Submodule is using total voltage average values at different levels as voltage reference value, by feeding back every grade
Capacitance voltage, electric voltage equalization stabilization on each electric capacity is adjusted in real time, it is identical to reach all module voltages.The phase of phaselocked loop section output
Position signal is used to provide voltage vector oriented control and trigger pulse generates required reference phase.
The control method of rectification stage specifically comprises the following steps：
Step S1, obtain High Level AC Voltage net side electric current Is；
Step S2, obtain each submodule VD Udc1, Udc2 ... Udcn of rectification stage；
Step S3, calculate High Level AC Voltage net side current reference value Is*；
Step S4, according to grid side current reference value Is*And High Level AC Voltage net side current sampling data Is is to rectification stage H
Bridge rectification module carries out closed-loop control；
Step S5, calculate each submodule VD average value V_ref of rectification stage；
Step S6, according to each submodule direct current output average voltage V_ref and each submodule output voltage Udc1, Udc2 ...
Udcn carries out closed-loop control to rectification submodule respectively.
The step S3 includes：
Step S31, summed according to submodule VD Udc1, Udc2 ... Udcn, obtain DC side total voltage
Step S32, according to DC side total voltageWith n times of each module DC voltage reference value Udc_ref
Carry out closed-loop control and obtain the amplitude is of ac-side current reference value；
Step S33, high-pressure side instantaneous voltage Us phase is obtained by PLL phaselocked loops；
Step S34, circuit is occurred by sine and obtains the sinusoidal signal Sinwt with Us same-phases；
Step S35, sinusoidal signal Sinwt is multiplied with the amplitude is of ac-side current reference value, obtains High Level AC Voltage
Current on line side reference value Is*。
(2) intermediate isolating level
DAB makes low-pressure side DC voltage reach designated value using phase shifting control, as shown in Figure 5.First, it is straight to compare low-pressure side
Voltage and setting reference value are flowed, obtains their difference, then DAB reference powers are drawn by PI controllers；Gather DAB secondary simultaneously
Electric current, it is multiplied after low pass filter with secondary voltage and obtains DAB module feedback power, finally ask poor with DAB reference powers
Value adjusts each DAB modules phase shifting angle by PI controllers, so as to reach the purpose of control low side power, when high-side system is sent out
When raw uneven, low pressure side system still can maintain original poised state.
The control method of intermediate isolating level specifically comprises the following steps：
Step S1, obtain low-pressure side VD Uco；
Step S2, obtain each isolation module low-voltage direct side output current id1, id2 ... idn；
Step S3, according to low-pressure side VD reference value Uco*Closed with low-pressure side VD Uco
Ring controls to obtain the total power that isolation module is connected after each Mixed cascading module, by power summation divided by n, obtains each intermediate frequency
Transformer efficiency reference value PDAB；
Step S4, each isolation module low-voltage direct side output current id1, id2 ... idn pass through low pass filter LPF, obtained
Output current calculated value
Step S5, according to low-pressure side VD Uco and output current calculated valuePass through
Power calculation unit obtains each intermediate-frequency transformer power PDAB1、PDAB2…PDABn；
Step S6, according to intermediate-frequency transformer value and power reference PDABWith each intermediate-frequency transformer power PDAB1、PDAB2…PDABnEnter
Row closed-loop control obtains each isolation module phase-shift control angle
(3) output stage
The DC port of output stage directly picks out from DAB secondary, and such as electric automobile charging pile port, control method uses base
In the Power balance control strategy of Feedback of Power, as shown in Fig. 5 DAB phase shifting controls.
The AC port of output stage connects DC/AC inverters by dc bus and formed, and exchange output passes through current inner loop and electricity
Outer shroud double-closed-loop control is pressed, realizes the constant frequency and constant voltage of output, control block diagram is as shown in Figure 6.First by output voltage, inductor current value
The d axles and q axis components of output voltage and inductive current are respectively obtained after DQ is converted, then by output voltage d, q component point
Not compared with reference voltage, error signal is used as current inner loop reference value after voltage PI regulator.Using current inner loop without
Beat control, current reference value and inductive current d, q component are respectively compared, errors signal passes through current inner loop dead beat
After adjuster, the output waveform of d, q axis component is obtained.Output waveform is finally obtained into modulating wave by DQ inverse transformations, carried out
SPWM is modulated, and produces pulsed drive three phase full bridge circuit, the three-phase alternating voltage stablized.Pair of outer voltage current inner loop
In close-loop control mode, inductive current inner ring can quickly suppress load disturbance influence, obtain preferable system dynamic response
Energy.Outer voltage can improve output voltage waveforms, improve output accuracy.
Claims (9)
- A kind of 1. multiport electric power electric transformer of Mixed cascading structure, it is characterised in that：The electric power electric transformer is opened up Flutterring structure includes rectification stage and intermediate isolating level, and rectification stage includes M Mixed cascading module, and the Mixed cascading module includes one The module that individual H bridges rectification module and n commutator block coupled in series being attached thereto form, intermediate isolating level include M*n isolation Module, the M and n are all higher than 1；Input of the input of H bridge rectification modules as Mixed cascading module, the H bridges rectification The input of module is by accessing power network, the output end of the H bridges rectification module and the n commutator block coupled in series after cascade Two inputs connection of the module formed, the output end of the output end of each rectification submodule as Mixed cascading module, often Individual rectification submodule has two output ends, the output end of M*n rectification submodule respectively with corresponding isolation module Input connects；DC output end of the output end of the M*n isolation module as electric power electric transformer, direct current output End voltage class and output capacity connection in series-parallel needed for；The rectification submodule includes half-bridge circuit and electric capacity, the half-bridge Circuit is in parallel with the electric capacity；The control method of the intermediate isolating level comprises the following steps：Step S1, obtains low-pressure side VD Uco, the low-pressure side VD Uco refer to it is wherein any N isolation module direct current of the connected all intermediate isolating levels of n rectification submodule output end of one Mixed cascading module is defeated Go out voltage sum；Step S2, obtain n isolation module low-voltage direct side output current id1, id2 ... the idn；Described isolation module bag Include the circuit being made up of inverter circuit, intermediate-frequency transformer, rectification circuit, described inverter circuit input and described commutator Module output end connects；Described intermediate-frequency transformer high-pressure side is connected with inverter circuit output end；Described rectification circuit is with Frequency power transformer low-pressure side connects；Step S3, closed loop control is carried out according to low-pressure side VD reference value Uco* and low-pressure side VD Uco System, and then obtain all centres being connected with n rectification submodule output end of wherein any one Mixed cascading module The power summation of n isolation module of isolation level, by power summation divided by n, obtain the reference of each intermediate isolating level transimission power Value PDAB；Step S4, n isolation module low-voltage direct side output current id1, id2 ... the idn pass through low pass filter LPF, obtained To output current calculated valueStep S5, according to the equal principle of each isolation module VD, by low-pressure side VD Uco Divided by n obtains the VD value of isolation module, passes through power meter in conjunction with the output current calculated value of isolation module Calculate unit and obtain the transimission power P of each intermediate isolating levelDAB1、PDAB2…PDABn；Step S6, according to the reference value P of each intermediate isolating level transimission powerDABWith the transimission power P of each intermediate isolating levelDAB1、 PDAB2…PDABnCarry out closed-loop control and obtain each isolation module phase-shift control angle
- A kind of 2. multiport electric power electric transformer of Mixed cascading structure according to claim 1, it is characterised in that：Also Including DC-AC inverter, described DC output end is in parallel to form dc bus, and it is inverse that the dc bus accesses the DC-AC Become device DC side, described DC-AC inverter AC connection low-voltage alternating-current power network.
- A kind of 3. multiport electric power electric transformer of Mixed cascading structure according to claim 2, it is characterised in that：Institute The DC-AC inverter stated includes full bridge inverter and LC filter circuits, and described full bridge inverter is by storage capacitor and six The individual IGBT with anti-paralleled diode is formed, and described storage capacitor includes higher level's electric capacity and subordinate's electric capacity, and higher level's electric capacity is with Level electric capacity is series relationship.
- 4. the multiport electric power electric transformer of a kind of Mixed cascading structure according to claim 1, it is characterised in that more The control circuit of port electric power electric transformer includes：Rectification stage first control circuit, for controlling H bridge rectification modules；Rectification stage second control circuit, for controlling rectification submodule；The power calculation circuit of intermediate isolating level first, for calculating intermediate isolating level modular power.
- A kind of 5. multiport electric power electric transformer of Mixed cascading structure according to claim 4, it is characterised in that：Institute Stating rectification stage first control circuit includes total voltage combiner circuit, and the total voltage combiner circuit is used to calculate rectification stage DC side Total voltage, and the total voltage calculated is exported to outer voltage PI controllers and described rectification stage second control circuit；Institute State the direct current output electricity that rectification stage DC side total voltage refers to n rectification submodule in wherein any one Mixed cascading module Press Udc1, Udc2 ... Udcn summation；Reference voltage amplifying circuit, by each rectification submodule DC voltage in any one described Mixed cascading module Reference value Udc_ref amplifies n times, and is sent to outer voltage PI controllers；PLL phase-locked loop circuits, for obtaining input high-tension electricity net side instantaneous voltage Us phase；Circuit occurs for sine, is connected with the PLL phase-locked loop circuits, for the input high pressure obtained according to PLL phase-locked loop circuits Grid side instantaneous voltage Us phases, the sinusoidal signal Sinwt with phase with Us is obtained, wherein the w represents the rotation of AC voltage Corner frequency；Outer voltage PI controllers, for DC side total voltage and n times of each rectification submodule DC voltage reference value Udc_ Ref difference carries out PI regulations, obtains High Level AC Voltage net side current reference value Is*；Current inner loop P controller, for High Level AC Voltage net side electric current Is's and High Level AC Voltage net side current reference value Is* Difference carries out P regulations, obtains cascaded H-bridges rectification module modulated signal.
- A kind of 6. multiport electric power electric transformer of Mixed cascading structure according to claim 4, it is characterised in that institute Stating rectification stage second control circuit includes：Division circuit, the average electricity of direct current output for calculating each rectification submodule in any one Mixed cascading module Press V_ref；PI controllers, for n rectification submodule in direct current output average voltage V_ref and any one Mixed cascading module Output voltage Udc1, Udc2 ... Udcn of block difference carry out PI regulations, obtain each rectification submodule modulated signal.
- A kind of 7. multiport electric power electric transformer of Mixed cascading structure according to claim 4, it is characterised in that institute Stating the power calculation circuit of intermediate isolating level first includes：Low pass filter LPF, for by pulsed DC signal id1, id2 ... idn It is transformed into continuous direct current signalPower calculation unit, by Uco respectively withPhase Multiply, calculate the power of each intermediate isolating level transmission；The PI controllers of intermediate isolating level the first, for low-pressure side VD Uco and low-pressure side VD to be joined The difference for examining value carries out PI controls, obtains the general power reference value of intermediate isolating level transmission, by itself divided by n, that is, obtains each centre The reference value P of isolation level transimission powerDAB；The PI controllers of intermediate isolating level the 2nd, for by the transimission power P of each intermediate isolating levelDAB1、PDAB2…PDABnWith centre The reference value P of isolation level transimission powerDABDifference carry out PI regulations, obtain each isolation module phase-shift control angle
- 8. a kind of control method of the multiport electric power electric transformer of Mixed cascading structure according to claim 1, its It is characterised by, the control method of the rectification stage comprises the following steps：Step S1, obtain High Level AC Voltage net side electric current Is；Step S2, obtain output voltage Udc1, Udc2 ... of n rectification submodule in wherein any one Mixed cascading module Udcn；Step S3, calculate High Level AC Voltage net side current reference value Is*；Step S4, it is whole to rectification stage H bridges according to grid side current reference value Is* and High Level AC Voltage net side current sampling data Is Flow module carries out closed-loop control；Step S5, calculate each rectification submodule VD average value V_ref；Step S6, according to each rectification submodule VD average value V_ref and described wherein any one Mixed cascading Output voltage Udc1, Udc2 ... Udcn of n rectification submodule in module carry out closed-loop control to rectification submodule respectively.
- 9. a kind of control method of the multiport electric power electric transformer of Mixed cascading structure according to claim 8, its It is characterised by, the step S3 includes：Step S31, the VD Udc1 of the n rectification submodule in wherein any one Mixed cascading module, Udc2 ... Udcn sum, and obtain rectification stage DC side total voltageStep S32, according to DC side total voltageWith each rectification in described wherein any one Mixed cascading module N times of the DC voltage reference value Udc_ref of submodule carries out closed-loop control and obtains the amplitude is of ac-side current reference value；Step S33, obtain inputting high-tension electricity net side instantaneous voltage Us phase by PLL phase-locked loop circuits；Step S34, circuit is occurred by sine and obtains the sinusoidal signal Sinwt with Us same-phases, wherein the w represents AC The rotation angular frequency of voltage；Step S35, sinusoidal signal Sinwt is multiplied with the amplitude is of ac-side current reference value, obtains High Level AC Voltage net side Current reference value Is*.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510303788.8A CN105048788B (en) | 2015-06-04 | 2015-06-04 | The multiport electric power electric transformer and its control method of a kind of Mixed cascading structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510303788.8A CN105048788B (en) | 2015-06-04 | 2015-06-04 | The multiport electric power electric transformer and its control method of a kind of Mixed cascading structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105048788A CN105048788A (en) | 2015-11-11 |
| CN105048788B true CN105048788B (en) | 2017-11-28 |
Family
ID=54455074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510303788.8A Active CN105048788B (en) | 2015-06-04 | 2015-06-04 | The multiport electric power electric transformer and its control method of a kind of Mixed cascading structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105048788B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105450038A (en) * | 2015-12-29 | 2016-03-30 | 中国电力科学研究院 | Modular H bridge cascade multi-level power electronic transformer control system |
| CN105720608B (en) * | 2016-04-27 | 2018-07-03 | 湖北文理学院 | A kind of flexibility power distribution station |
| CN106451576B (en) * | 2016-10-27 | 2019-04-12 | 西安交通大学 | A kind of control method of the electric power electric transformer of single-phase multi output |
| CN106877674B (en) * | 2017-03-21 | 2018-12-07 | 许继集团有限公司 | Mode of resonance DC/DC inverter power balance control method and control system |
| CN107134928A (en) * | 2017-06-01 | 2017-09-05 | 西南交通大学 | Multimode full-bridge isolates DC DC inverter powers balance control methods and device |
| CN108347051A (en) * | 2018-02-05 | 2018-07-31 | 湖南大学 | A kind of mixing multiport electric and electronic power adjuster |
| CN108832825B (en) * | 2018-07-06 | 2020-01-24 | 华北电力大学 | High power density's multiport power electronic transformer topology |
| CN111030487B (en) * | 2019-12-12 | 2021-02-19 | 西安交通大学 | Phase capacitance voltage control method applied to modular multilevel converter |
| CN111244943B (en) * | 2020-01-20 | 2021-08-03 | 清华大学 | AC/DC subnet interaction influence evaluation method based on power electronic transformer networking |
| CN112505586A (en) * | 2020-12-28 | 2021-03-16 | 国网河北省电力有限公司电力科学研究院 | Fault detection method and device for distribution line in photovoltaic grid-connected power generation system |
| CN118137833A (en) * | 2024-03-07 | 2024-06-04 | 上海鲲悟丰电科技有限公司 | Direct current conversion system, bidirectional DC/DC converter and conversion method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956911A (en) * | 2014-05-05 | 2014-07-30 | 国家电网公司 | Modularized H-bridge cascade multilevel mutual-balance power electronic transformer |
| CN104184350A (en) * | 2014-07-28 | 2014-12-03 | 中国矿业大学(北京) | Large-power mixed cascading bridge-type unit power factor rectifier |
| CN204835971U (en) * | 2015-06-04 | 2015-12-02 | 广西电网有限责任公司电力科学研究院 | Multiport power electronic transformer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7679941B2 (en) * | 2007-06-06 | 2010-03-16 | General Electric Company | Power conversion system with galvanically isolated high frequency link |
-
2015
- 2015-06-04 CN CN201510303788.8A patent/CN105048788B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103956911A (en) * | 2014-05-05 | 2014-07-30 | 国家电网公司 | Modularized H-bridge cascade multilevel mutual-balance power electronic transformer |
| CN104184350A (en) * | 2014-07-28 | 2014-12-03 | 中国矿业大学(北京) | Large-power mixed cascading bridge-type unit power factor rectifier |
| CN204835971U (en) * | 2015-06-04 | 2015-12-02 | 广西电网有限责任公司电力科学研究院 | Multiport power electronic transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105048788A (en) | 2015-11-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105048788B (en) | The multiport electric power electric transformer and its control method of a kind of Mixed cascading structure | |
| CN107528491B (en) | A kind of cascaded H-bridges multi-level converter and its control method | |
| CN105553304B (en) | A kind of modular multilevel type solid-state transformer and its internal model control method | |
| CN204835971U (en) | Multiport power electronic transformer | |
| CN103683288B (en) | Based on parallel active filter and the control method thereof of Modular multilevel converter | |
| CN105490552A (en) | Modular multilevel converter (MMC) based solid-state transformer and control method thereof | |
| CN103151785B (en) | Multi-converter parallel circulating current restraining method with quick and reactive support | |
| CN104810857B (en) | Single-phase grid-connected photovoltaic power generation system output power smooth control device and control method | |
| CN109756121B (en) | MMC-based isolated DC-DC direct current converter and control method | |
| CN203827197U (en) | Modular H bridge cascaded multilevel mutually-balanced electric power electronic transformer | |
| CN103956911A (en) | Modularized H-bridge cascade multilevel mutual-balance power electronic transformer | |
| CN103973121B (en) | single-phase power electronic transformer | |
| CN109217687A (en) | Power distribution network electric power electric transformer and its control method based on MMC | |
| CN104836424A (en) | Energy router with cascaded module voltage automatic balancing circuit | |
| CN108565883B (en) | STATCOM-ESS-based photovoltaic low voltage ride through device and control method | |
| CN102545675B (en) | Hybrid series H-bridge multi-level grid-connected inverter direct current bus voltage control method | |
| CN205389177U (en) | Novel many level of modularization type solid -state transformer | |
| Sahu et al. | Transformerless hybrid topology for medium-voltage reactive-power compensation | |
| CN110970909B (en) | Method and system for regulating and controlling hybrid unified power quality controller | |
| CN203827195U (en) | Single phase power electronic transformer | |
| CN107612027A (en) | A kind of photovoltaic DC-to-AC converter DC voltage transient state falls suppressing method | |
| CN105429472A (en) | Star angle-shape rectifier-type high-power DC step-up converter and control method thereof | |
| CN105870944B (en) | A kind of alternate Power balance control method of electric power electric transformer | |
| CN112072669B (en) | Variable ratio voltage regulation and current compensation autotransformer and method | |
| CN110854905B (en) | Power sharing control method for open-winding double-inverter photovoltaic power generation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |