CN204835971U - Multiport power electronic transformer - Google Patents
Multiport power electronic transformer Download PDFInfo
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- CN204835971U CN204835971U CN201520382653.0U CN201520382653U CN204835971U CN 204835971 U CN204835971 U CN 204835971U CN 201520382653 U CN201520382653 U CN 201520382653U CN 204835971 U CN204835971 U CN 204835971U
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Abstract
The utility model discloses a multiport power electronic transformer, power electronic transformer include rectification level, middle isolation level, and the rectification level is mixed by M and is cascaded the module and cascade and form, mix to cascade the module and include a H bridge rectifier module and a n module, and H bridge rectifier module's input is through inserting the electric wire netting after cascading, H bridge rectifier module's output and the input of the module behind n the sub - serial module is connected, and the output of a mn module is connected with the input of corresponding with it isolation module respectively, the output port of a mn isolation module regards as power electronic transformer's direct current output port, and direct current output port is according to required electric pressure and output capacity connection in series -parallel. The utility model discloses it alternaties the application of multiport low -voltage occasion to be particularly suitable for the high -tension electricity, under can satisfying the same direct current terminal number volume, device quantity reduces, practices thrift the cost by a wide margin, full modular structure makes the capacity nature extended good.
Description
Technical field
The utility model relates to electrical equipment technical field, particularly relates to electric power electric transformer.
Background technology
In recent years, along with the development of device for high-power power electronic technology and modern control theory, a kind of equipment being realized transformation of electrical energy by power electronic technology---electric power electric transformer (PowerElectronicTransformer, PET) is just more and more subject to the attention of Chinese scholars.The electric power electric transformer equipment investment had at present for power distribution network runs.PET has broad application prospects due to the good characteristic that its high controllability, high power supply quality and harmonic wave are few.But also there are some shortcomings in the electric power electric transformer of existing structure, the application particularly under many power supplys occasion.
Traditional many level topological structure, along with the increase of level number and DC port, required power electronic device and the complexity of topology all will increase greatly.And in the utility model, devise the multiport electric power electric transformer based on Mixed cascading structure, cascaded H-bridges is connected with multiple direct current output sub-module, being particularly suitable for high-voltage variable changes to compared with low dc voltage or the more application scenario of DC side electric current number demand, as distributed energy storage system, charging electric vehicle etc.Prime rectifier bridge arm voltage change ratio (dv/dt) and current changing rate (di/dt) all lower, the voltage stress that switching device bears is little, and the withstand voltage of DC bus capacitor, capacity and volume reduce greatly.AC level number is more than conventional electric power electronic transformer, and each harmonic containing ratio and total harmonic distortion factor also reduce greatly, thus can reduce even to save jumbo alternating current filter.Complete modular structure also make capacity expand and Redundancy Design more easy.
Existing technical scheme one: comprise modular multilevel rectifier, isolation level and inverter, modular multilevel rectifier comprises multiple submodule, and inverter comprises the power conversion modules of multiple connection parallel with one another.The shortcoming of prior art one: (1) high-pressure side level number is few, and harmonic content is higher.(2) inverter circuit comprises multiple power conversion modules, device redundancy, and cost is high.
Existing technical scheme one: comprise modular multilevel rectifier, isolation level and inverter, modular multilevel rectifier comprises multiple submodule, and inverter comprises the power conversion modules of multiple connection parallel with one another.The shortcoming of prior art one: (1) high-pressure side level number is few, and harmonic content is higher.(2) inverter circuit comprises multiple power conversion modules, device redundancy, and cost is high.
Utility model content
In order to solve above technical problem, the utility model provides a kind of multiport electric power electric transformer based on Mixed cascading structure and control method thereof.
The technical solution of the utility model is as follows:
A kind of multiport electric power electric transformer, it is characterized in that: described electric power electric transformer topological structure comprises rectification stage and intermediate isolating level, rectification stage comprises M Mixed cascading module, described Mixed cascading module comprises the module of a H bridge rectification module and the n that is attached thereto sub-block coupled in series, and intermediate isolating level comprises M*n isolation module; The input of H bridge rectification module is as the input of Mixed cascading module, the input of described H bridge rectification module is by accessing electrical network after cascade, the output of described H bridge rectification module is connected with two inputs of the module of described n sub-block coupled in series, the output of each submodule is as the output of Mixed cascading module, each submodule has two outputs, and the output of M*n commutator module is connected with the input of corresponding isolation module respectively; The output of a described M*n isolation module is all as the DC output end of electric power electric transformer, and DC output end is according to required voltage grade and output capacity connection in series-parallel;
Described submodule comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection.
Described a kind of multiport electric power electric transformer, it is characterized in that: also comprise DC-AC inverter, described DC output end parallel connection forms DC bus, and described DC bus accesses described DC-AC inverter direct-flow side, and described DC-AC inverter ac side connects low-voltage alternating-current electrical network.
Described a kind of multiport electric power electric transformer, it is characterized in that: described DC-AC inverter comprises full bridge inverter and LC filter circuit, described inverter circuit is made up of the IGBT of storage capacitor and six band anti-paralleled diodes, described storage capacitor comprises 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 comprises by inverter circuit, intermediate frequency transformer, rectification circuit, and described inverter circuit input is connected with the submodule output of described rectification stage respectively; Described intermediate frequency transformer high-pressure side is connected with inverter circuit output; Described rectification circuit is connected with intermediate frequency transformer low-pressure side.
Described inverter circuit is single-phase full bridge inverter circuit, and described inverter circuit is made up of the IGBT of four band anti-paralleled diodes; Described rectification circuit is full bridge rectifier, and described rectification circuit is made up of the IGBT of four band anti-paralleled diodes.
Described a kind of multiport electric power electric transformer, is characterized in that: its control circuit comprises:
Rectification stage first control circuit, for control H bridge rectification module;
Rectification stage second control circuit, for controlling rectification stage submodule;
Intermediate isolating level first power calculation circuit, for calculating intermediate isolating level modular power.
Described rectification stage first control circuit comprises:
Total voltage combiner circuit, calculates rectification stage DC side total voltage
and will
export to outer voltage PI controller and described rectification stage second control circuit;
Reference voltage amplifying circuit, amplifies n doubly, and sends to outer voltage PI controller by each module DC voltage reference value U_ref;
PLL phase-locked loop circuit, for obtaining the phase place of instantaneous voltage Us;
Sinusoidal circuit for generating, is connected with described PLL phase-locked loop, for the Us phase place obtained according to PLL phase-locked loop, obtains the sinusoidal signal Sinwt with Us homophase;
Outer voltage PI controller, for carrying out PI adjustment to the difference of DC side total voltage and n doubly each submodule DC side reference voltage Udc_ref, obtains High-voltage AC Network side current reference value Is*;
Current inner loop P controller, for carrying out P adjustment to the difference of High-voltage AC Network side electric current I s and High-voltage AC Network side current reference value Is*, obtains cascaded H-bridges module modulation signal.
Described rectification stage second control circuit comprises:
Division circuit, exports average voltage V_ref for calculating each submodule direct current;
PI controller, for exporting average voltage V_ref and each submodule VD Udc1, Udc2 to direct current ... the difference of Udcn carries out PI adjustment, obtains each submodule modulation signal.
Described intermediate isolating level first power calculation circuit, comprising:
Low pass filter LPF, for by pulsed DC signal id1, id2 ... idn is transformed into continuous direct current signal
Power calculation unit, by Uco respectively with
be multiplied, calculate the power of each isolation level transmission;
Intermediate isolating level the one PI controller, for the difference of low-pressure side VD Uco and low-pressure side VD reference value is carried out PI control, obtain the gross power reference value of intermediate isolating level transmission, by it divided by n, namely obtain the reference value P of each intermediate isolating level through-put power
dAB;
Intermediate isolating level the 2nd PI controller, for the power P each intermediate isolating level transmitted
dAB1, P
dAB2p
dABnwith the reference value P of intermediate isolating level through-put power
dABdifference carry out PI adjustment, obtain each isolation module phase-shift control angle
Relative to prior art, the beneficial effect of technical solutions of the utility model is as follows:
(1) adopt Mixed cascading topological structure, be particularly suitable for high-tension electricity and transform to multiport low-voltage applications;
(2) except realizing conventional electric power electronic transformer function, under identical DC terminal quantity can also be met, a large amount of minimizings of power electronic device, significantly cost-saving;
(3) after rectification, DC power supply is many, and voltage is little, can reduce electric capacity withstand voltage, reduces electric capacity volume;
(4) use simple algorithm that capacitance voltage just can be made to reach balance;
(5) complete modular structure makes capacity expansion more convenient, and submodule quantity increases and decreases according to demand.
Accompanying drawing explanation
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 outer voltage current inner loop double-closed-loop control block diagram of the Mixed cascading module of a preferred embodiment of the present invention;
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 outer voltage current inner loop double-closed-loop control block diagram of the inverter of a preferred embodiment of the present invention.
Embodiment
The technical solution of the utility model is further illustrated below in conjunction with accompanying drawing.
Shown in Fig. 1, a kind of multiport electric power electric transformer is made up of tertiary structure, rectification stage, intermediate isolating level and output stage.Rectification stage is Mixed cascading structure, and the High Level AC Voltage wherein inputted, through H bridge cascade rectifier, obtains unstable direct voltage, then passes through the balance charge/discharge of each submodule, reaches the in a basic balance of capacitance voltage.Intermediate isolating level is two-way full-bridge converter (DAB), control energy flow, wherein intermediate frequency transformer (MFT) realizes electric pressure conversion and buffer action, and the leakage reactance of MFT needs enough large, thus the phase shift of former limit required under meeting rated power and secondary voltage.DAB output port is that direct current exports, and can access electric automobile charging pile separately, photovoltaic system, DC power supply, DC energy storage system etc., also in parallelly can form DC bus, thus form multiport output.DC output end can according to required voltage grade and the free connection in series-parallel of output capacity, flexible adaptation different application occasion.At DC bus access DC/AC inverter, can be formed and exchange output, for AC system is powered.Wherein exchanging output is three-phase full-bridge inverter, and DC side is made up of two capacitances in series, is respectively higher level's electric capacity and subordinate's electric capacity.Power circuit is three-phase full-bridge inverting circuit, accessible distribution after filtering.
Its operation principle is: High Level AC Voltage is after cascaded H-bridges and submodule rectification, obtain galvanic current pressure, realize the balance charge/discharge of each submodule, reach the in a basic balance of capacitance voltage, maintain the constant of every grade of direct voltage, and control high-pressure side alternating current harmonic wave and power factor.Direct voltage on submodule electric capacity is carried out step-down and isolation by intermediate isolating level, and power devices all in DAB topological structure all adopts wholly-controled device, can realize flow of power seamless control.The active power single-phase full bridge advanced from phase angle flow to the delayed single-phase full bridge in phase angle, watt level is determined by phase angle difference and DAB two ends direct voltage magnitude difference, keeps the constant of the stable of DC port output voltage or through-put power by closed-loop control.Thus DC port can be used as electric automobile charging pile, photovoltaic system, DC power supply, the interface of DC energy storage system and DC load system, also becomes direct current into three-phase alternating current by DC/AC inverter, supply three-phase alternating current system.
Its specific implementation process is:
(1) rectification stage
Rectification stage controls as shown, and it is made up of links such as outer shroud direct current total voltage adjuster, inner ring current controller, submodule voltage regulator, Phase-Locked Synchronous link and trigger impulse generations.Inner ring current controller realizes the direct control of converter ac-side current waveform and phase place, with quick track reference electric current.Outer shroud direct current total voltage controls then to realize constant DC voltage control according to system-level control objectives.Total voltage mean value at different levels as voltage reference value, by feeding back every grade of capacitance voltage, being regulated voltage equalization stable on each electric capacity, reaching all module voltage identical by submodule in real time.The phase signal that phase-locked link exports is for providing the reference phase needed for voltage vector oriented control and trigger impulse generation.
(2) intermediate isolating level
DAB uses phase shifting control to make low-pressure side direct voltage reach designated value, as shown in Figure 5.First, compare low-pressure side direct voltage and setting reference value, obtain their difference, then draw DAB reference power by PI controller; Gather DAB secondary current simultaneously, be multiplied with secondary voltage after low pass filter and obtain DAB module feedback power, last and DAB reference power asks difference to regulate each DAB module phase shifting angle by PI controller, thus reach the object controlling low side power, when high-side system occurs uneven, low-pressure side system still can maintain original poised state.
(3) output stage
DC port in output stage directly picks out from DAB secondary, and as electric automobile charging pile port, control method adopts the Power balance control strategy based on Feedback of Power, as above shown in Fig. 5 DAB phase shifting control.
AC port in output stage connects DC/AC inverter by DC bus and is formed, and exchanges and exports by current inner loop and outer voltage double-closed-loop control, and realize the constant frequency and constant voltage exported, control block diagram as shown in Figure 6.First output voltage, inductor current value are obtained after DQ conversion d axle and the q axle component of output voltage and inductive current respectively, then by output voltage d, q component respectively compared with reference voltage, error signal after voltage PI regulator as current inner loop reference value.Adopt current inner loop track with zero error, current reference value compared respectively with inductive current d, q component, errors signal, after current inner loop dead beat adjuster, obtains the output waveform of d, q axle component.Finally output waveform is obtained modulating wave through DQ inverse transformation, carry out SPWM modulation, produce pulsed drive three phase full bridge circuit, obtain stable three-phase alternating voltage.In the double circle controling mode of outer voltage current inner loop, inductive current inner ring can suppress load disturbance to affect fast, obtains good system dynamic response performance.Outer voltage can improve output voltage waveforms, improves output accuracy.
Claims (7)
1. a multiport electric power electric transformer, it is characterized in that: described electric power electric transformer topological structure comprises rectification stage and intermediate isolating level, rectification stage comprises M Mixed cascading module, described Mixed cascading module comprises the module of a H bridge rectification module and the n that is attached thereto sub-block coupled in series, and intermediate isolating level comprises M*n isolation module; The input of H bridge rectification module is as the input of Mixed cascading module, the input of described H bridge rectification module is by accessing electrical network after cascade, the output of described H bridge rectification module is connected with two inputs of the module of described n sub-block coupled in series, the output of each submodule is as the output of Mixed cascading module, each submodule has two outputs, and the output of M*n commutator module is connected with the input of corresponding isolation module respectively; The output of a described M*n isolation module is all as the DC output end of electric power electric transformer, and DC output end is according to required voltage grade and output capacity connection in series-parallel;
Described submodule comprises half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection.
2. a kind of multiport electric power electric transformer according to claim 1, it is characterized in that: also comprise DC-AC inverter, described DC output end parallel connection forms DC bus, described DC bus accesses described DC-AC inverter direct-flow side, and described DC-AC inverter ac side connects low-voltage alternating-current electrical network.
3. a kind of multiport electric power electric transformer according to claim 2, it is characterized in that: described DC-AC inverter comprises full bridge inverter and LC filter circuit, described inverter circuit is made up of the IGBT of storage capacitor and six band anti-paralleled diodes, described storage capacitor comprises higher level's electric capacity and subordinate's electric capacity, and higher level's electric capacity and subordinate's electric capacity are series relationship.
4. a kind of multiport electric power electric transformer according to claim 1, is characterized in that: the control circuit of electric power electric transformer comprises:
Rectification stage first control circuit, for control H bridge rectification module;
Rectification stage second control circuit, for controlling rectification stage submodule;
Intermediate isolating level first power calculation circuit, for calculating intermediate isolating level modular power.
5. a kind of multiport electric power electric transformer according to claim 4, is characterized in that, described rectification stage first control circuit comprises:
Total voltage combiner circuit, calculates rectification stage DC side total voltage
and will
export to outer voltage PI controller and described rectification stage second control circuit;
Reference voltage amplifying circuit, amplifies n doubly, and sends to outer voltage PI controller by each module DC voltage reference value U_ref;
PLL phase-locked loop circuit, for obtaining the phase place of instantaneous voltage Us;
Sinusoidal circuit for generating, is connected with described PLL phase-locked loop, for the Us phase place obtained according to PLL phase-locked loop, obtains the sinusoidal signal Sinwt with Us homophase;
Outer voltage PI controller, for carrying out PI adjustment to the difference of DC side total voltage and n doubly each submodule DC side reference voltage Udc_ref, obtains High-voltage AC Network side current reference value Is*;
Current inner loop P controller, for carrying out P adjustment to the difference of High-voltage AC Network side electric current I s and High-voltage AC Network side current reference value Is*, obtains cascaded H-bridges module modulation signal.
6. a kind of multiport electric power electric transformer according to claim 4, is characterized in that: described rectification stage second control circuit comprises:
Division circuit, exports average voltage V_ref for calculating each submodule direct current;
PI controller, for exporting average voltage V_ref and each submodule VD Udc1, Udc2 to direct current ... the difference of Udcn carries out PI adjustment, obtains each submodule modulation signal.
7. a kind of multiport electric power electric transformer according to claim 4, is characterized in that, described intermediate isolating level first power calculation circuit, comprising:
Low pass filter LPF, for by pulsed DC signal id1, id2 ... idn is transformed into continuous direct current signal
Power calculation unit, by Uco respectively with
be multiplied, calculate the power of each isolation level transmission;
Intermediate isolating level the one PI controller, for the difference of low-pressure side VD Uco and low-pressure side VD reference value is carried out PI control, obtain the gross power reference value of intermediate isolating level transmission, by it divided by n, namely obtain the reference value P of each intermediate isolating level through-put power
dAB;
Intermediate isolating level the 2nd PI controller, for the power P each intermediate isolating level transmitted
dAB1, P
dAB2p
dABnwith the reference value P of intermediate isolating level through-put power
dABdifference carry out PI adjustment, obtain each isolation module phase-shift control angle
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048788A (en) * | 2015-06-04 | 2015-11-11 | 广西电网有限责任公司电力科学研究院 | Multi-port power electronic transformer of mixed cascading structure, and control method thereof |
| CN106341044A (en) * | 2016-10-19 | 2017-01-18 | 华北电力大学（保定） | Comprehensive efficiency optimization control method for modularized power electronic transformer |
| CN107017638A (en) * | 2017-05-23 | 2017-08-04 | 杭州电子科技大学 | A kind of many bus electric energy router topological structures of multiport suitable for power distribution network |
| CN107317493A (en) * | 2017-06-27 | 2017-11-03 | 西安电子科技大学 | A kind of electrical changing station Modular multilevel converter transmitted based on non-contact type electric energy |
| CN107623456A (en) * | 2017-09-29 | 2018-01-23 | 东南大学 | Multiport electric power electric transformer topology and its control method based on MMC |
| CN109463030A (en) * | 2016-05-20 | 2019-03-12 | 通用电气技术有限公司 | The control of voltage source converter |
| CN111464050A (en) * | 2020-04-28 | 2020-07-28 | 深圳供电局有限公司 | AC/DC converter control method, device, AC/DC converter equipment and storage medium |
| CN111865120A (en) * | 2020-05-23 | 2020-10-30 | 青岛鼎信通讯股份有限公司 | Energy router alternating current side modulation method based on serial digital voltage stabilizer |
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- 2015-06-04 CN CN201520382653.0U patent/CN204835971U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105048788A (en) * | 2015-06-04 | 2015-11-11 | 广西电网有限责任公司电力科学研究院 | Multi-port power electronic transformer of mixed cascading structure, and control method thereof |
| CN105048788B (en) * | 2015-06-04 | 2017-11-28 | 广西电网有限责任公司电力科学研究院 | The multiport electric power electric transformer and its control method of a kind of Mixed cascading structure |
| CN109463030A (en) * | 2016-05-20 | 2019-03-12 | 通用电气技术有限公司 | The control of voltage source converter |
| CN106341044A (en) * | 2016-10-19 | 2017-01-18 | 华北电力大学（保定） | Comprehensive efficiency optimization control method for modularized power electronic transformer |
| CN106341044B (en) * | 2016-10-19 | 2019-03-05 | 华北电力大学（保定） | A kind of modular power electronics transformer synthesis efficiency optimization control method |
| CN107017638A (en) * | 2017-05-23 | 2017-08-04 | 杭州电子科技大学 | A kind of many bus electric energy router topological structures of multiport suitable for power distribution network |
| CN107317493A (en) * | 2017-06-27 | 2017-11-03 | 西安电子科技大学 | A kind of electrical changing station Modular multilevel converter transmitted based on non-contact type electric energy |
| CN107623456A (en) * | 2017-09-29 | 2018-01-23 | 东南大学 | Multiport electric power electric transformer topology and its control method based on MMC |
| CN111464050A (en) * | 2020-04-28 | 2020-07-28 | 深圳供电局有限公司 | AC/DC converter control method, device, AC/DC converter equipment and storage medium |
| CN111464050B (en) * | 2020-04-28 | 2021-08-27 | 深圳供电局有限公司 | AC/DC converter control method, device, AC/DC converter equipment and storage medium |
| CN111865120A (en) * | 2020-05-23 | 2020-10-30 | 青岛鼎信通讯股份有限公司 | Energy router alternating current side modulation method based on serial digital voltage stabilizer |
| CN111865120B (en) * | 2020-05-23 | 2023-07-07 | 青岛鼎信通讯股份有限公司 | Energy router alternating current side modulation method based on serial digital voltage stabilizer |
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