CN106099948B - A kind of power electronics is flexible coupling switch topology and its control method - Google Patents
A kind of power electronics is flexible coupling switch topology and its control method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
It is flexible coupling switch topology and its control method the invention discloses a kind of power electronics, the power network of two free voltage grades can be connected, power electronics is flexible coupling in switch topology, included successively：Isolating transformer 1, switch 1, wave filter 1, power electronics be flexible coupling switch, wave filter 2, switch 2, isolating transformer 2；The power electronics is flexible coupling to switch to be made up of converter 1 and converter 2, the DC side of two converters, which links together, forms dc bus, the AC of converter 1 is connected with wave filter 1, the AC of converter 2 is connected with wave filter 2, and DC support electric capacity is connected between the both positive and negative polarity of dc bus；The power electronics of the present invention is flexible coupling switch can be with independent control active power and reactive power, and dynamic compensates the reactive power of ac bus, stable DC busbar voltage.
Description
Technical field
The present invention relates to field of power electronics, is especially that by the locally reactive-load compensation of multiple power networks, active power
The power electronics of the functions such as balance is flexible coupling switch topology and its control method.
Background technology
With developing rapidly for distributed power generation and micro-capacitance sensor, multiple region partial electric grids interconnections are to realize resource and energy
Complementary, economical and efficient utilizes the effective means of electric energy.
Back-to-back converter has very wide because of the advantages that its DC voltage is controllable, to and fro flow of power, exchange power transmission and distribution
General application.Compared with generic converter, back-to-back converter uses pulsewidth modulation (PWM) rectification, and its DC bus-bar voltage can
Control, power factor are adjustable to unity power factor so that its control performance is flexible and changeable, uses back-to-back converter to cause electricity
Interconnection, and stable operation are realized between net, is with a wide range of applications；However, network re-active power and reactive power control
System, dynamic compensates the reactive power of ac bus, is asking of must being solved in engineer applied the problems such as stable DC busbar voltage
Topic.
The content of the invention
It is flexible coupling switch topology and its control method present invention solves the technical problem that being to provide a kind of power electronics.
Can be with independent control active power and reactive power, dynamic compensates the reactive power, stable DC busbar voltage etc. of ac bus.
The technical scheme is that：
There is provided a kind of power electronics to be flexible coupling switch topology, the power network of any two voltage class, its feature can be connected
It is, the power electronics is flexible coupling in switch topology, includes successively：Isolating transformer 1, switch 1, wave filter 1, power electronics
Be flexible coupling switch, wave filter 2, switch 2, isolating transformer 2；The power electronics is flexible coupling switch by converter 1 and converter 2
Form, the DC side of two converters, which links together, forms dc bus, and the AC of converter 1 is connected with wave filter 1, becomes
The AC of parallel operation 2 is connected with wave filter 2, and DC support electric capacity is connected between the both positive and negative polarity of dc bus.
Between power network A and wave filter 1 between power network B and wave filter 2 at least one end be connected with different no-load voltage ratios isolate change
Depressor 1 or isolating transformer 2；The isolating transformer 1 and/or isolating transformer 2 use triangle-star structure or use
Star-delta structure either star-star structure or triangle-triangular structure.
Converter 1 and 2 each self-contained 3 pairs or 4 pairs of upper and lower bridge arms, output three-phase three wire system or three-phase four-wire system exchange
Electricity；The converter 1 and converter 2 are the full bridge structures of the full bridge structure that three-phase six switchs or four phases eight switch；It is or described
Converter 1 and converter 2 are multi-level converters.
The DC support electric capacity is made up of the electric capacity of two series connection, and the midpoint O of series connection exports as zero line with converter
Three-phase alternating current collectively form three-phase four-wire system exchange output.
The three-phase alternating current output end of the converter 1 and converter 2 connects an inductance, one end of inductance and conversion respectively
Device 1 connects with the midpoint of a certain phase in three-phase bridge arm in 2, and the other end of inductance is connected to midpoint O by an electric capacity.
The converter 1 and converter 2 carry out static dynamic passive compensation to power network A and power network B respectively（SVG）Control.
Also include the initial power-supply circuit of dc bus, two inputs of single-phase transformer connect three phase network A or B respectively
Two phase lines therein, the output end connection diode rectifier bridge of single-phase transformer, the output connection direct current of diode rectifier bridge
Bus；In the output end of single-phase transformer and the connecting line of diode rectifier bridge, current-limiting resistance is in series with；Single-phase transformer it is defeated
Enter end with the connecting line of power network, being in series with switch.
Also include the power-supply circuit of control circuit, the power-supply circuit uses the power module of wide input voltage, the electricity
The input connection dc bus of source module, the output end output 24V DC voltages of the power module, by the 24V direct currents
Voltage is further converted into+15V ,+5V by power panel, ± 15V voltages, with to control circuit and liquid crystal power supply.
A kind of power electronics is flexible coupling switch topology dc bus stable control method, and dc bus set-point Udc* is subtracted
The actual value Udc currently measured is removed, obtained voltage difference is multiplied by 1/2 output as electric current after being sent into pi regulator calculating processing
Regulate signal, the current regulating signal is subtracted into current instantaneous feedback electric current iaf, the ibf of converter 1 and 2, obtained electric current
Difference is sent into another pi regulator, active current is just all contained in the instruction current signal of such two converter, and then mend
Repay in the compensation electric current of system and also contain certain active current, so that the DC side of compensation system exchanges with AC
Energy, DC bus-bar voltage is maintained into set-point.When converter works, its energy loss can cause DC capacitor voltage
Reduce, but in order to ensure the normal work of PWM current transformers, DC bus-bar voltage must remain constant.To increase in this control method
The PI controllers of a detection DC voltage are added, to keep the voltage of DC link.Control method defines converter absorption
Active power is shared equally by two-phase, to maintain the normal work of converter.
A kind of power electronics is flexible coupling switch topology and its control method, and the power electronics is flexible coupling in switch topology,
It is flexible coupling switch, multiple switch, multiple isolating transformers comprising multiple power electronics；The power electronics is flexible coupling switch by more
Individual converter is formed, and the DC side of multiple converters, which links together, forms dc bus, connects between the both positive and negative polarity of dc bus
DC support electric capacity is connected to, passes through the Comprehensive Control of central controller, it is possible to achieve be multiple to be unable to power network between voltage class
Interconnect, realize the reactive-load compensation of multiple power networks, active balance power flowcontrol.
A kind of active balance control method, DC bus-bar voltage set-point Udc* is subtracted to the actual value Udc currently measured,
Obtained voltage difference exports after PI controllers calculating processing；Power network A and B electric current are distinguished using power network A and B voltage
Lock phase simultaneously isolates the active component of power network A and B electric current after LPF LPF, active point of the power network A and B electric currents
After the output summation of amount and above-mentioned PI controllers, 1/2 is multiplied by, converter instruction current iaref and ibref are obtained, by the electricity
Current instruction current iaref and ibref is individually subtracted in net A and B power network current, and change is individually subtracted in obtained current differential again
Feedback current iaf, ibf of parallel operation 1 and converter 2, obtained difference are sent into another PI controllers, another PI controllers
Output relatively makees difference with carrier wave ratio, by difference adjusting the output of converter 1 and converter 2；To realize two adjacent network loads
Between active balance, take will two electric network active electric currents be added after the method divided again, two phase loads are distinguished afterwards
Compensate.
The beneficial effects of the invention are as follows：The PI adjusters result of DC voltage gives two converters respectively in the algorithm,
To keep the voltage of DC link, energy stable DC busbar voltage is taken compared to from one end, its advantage is to take the more ones degree of freedom of energy,
System is relatively reliable.Active power can be shifted between the two converters, and can be with independent control active power and idle work(
Rate, dynamic compensate the reactive power, stable DC busbar voltage etc. of ac bus.The present invention can be effectively overcome in power distribution network often
Rule switch only possesses the deficiency of on and off two states, the flexibility of enhancing distribution network operation control, meets that distributed power source disappears
Receive, the custom power demand such as high power supply reliability.
Brief description of the drawings
Fig. 1 power electronics is flexible coupling switch topology principle；
Fig. 2 power electronics is flexible coupling switch topology；
The initial power-supply circuit of Fig. 3 dc bus；
Fig. 4 control circuit power supply circuits；
Fig. 5 power electronics is flexible coupling switch DC bus stable control method；
Fig. 6 power electronics, which is flexible coupling, switchs active balance control method.
Embodiment
Fig. 1-Fig. 2 is that power electronics is flexible coupling the topology theory and its structure chart of switch, by the isolating transformer on both sides,
For a variety of situations, the power network A and B of any two voltage class can be connected, the power electronics is flexible coupling in switch topology,
Include successively：Isolating transformer 1, switch 1, wave filter 1, power electronics be flexible coupling switch, wave filter 2, switch 2, isolate transformation
Device 2；The power electronics is flexible coupling to switch to be made up of converter 1 and converter 2, and the DC side of two converters links together
Dc bus is formed, the AC of converter 1 is connected with wave filter 1, and the AC of converter 2 is connected with wave filter 2, and direct current is female
DC support electric capacity is connected between the both positive and negative polarity of line.Above-mentioned a variety of situations are such as：1）There is transformer on both sides；2）Both sides are only
Have while there is transformer；3）Both sides all do not have transformer；4）Converter is phase three-wire three converter；5）Converter is three-phase and four-line
Converter；6）Converter is three-phase four-arm converter；7）Converter is three level；8）Converter is more level；9）Converter
It is by modular multi-level converter（MMC）Form.
It will be described in more detail below, isolating transformer 1 and/or power network B and filter be connected between power network A and wave filter 1
Isolating transformer 2 is connected between ripple device 2；The isolating transformer 1 and/or isolating transformer 2 use triangle-star structure
Either use star-delta structure or star-star structure or triangle-triangular structure；The converter 1 and 2
Each self-contained 3 pairs of upper and lower bridge arms, output three-phase three wire alternating current；Each self-contained 3 pairs of upper and lower bridge arms of converter 1 and 2, institute
State DC support electric capacity to be made up of the electric capacity of two series connection, the midpoint O of series connection is as zero line, the three-phase alternating current with converter output
Collectively form three-phase four-wire system exchange output；The three-phase alternating current output end of the converter 1 and converter 2 connects an electricity respectively
Sense, one end of inductance are connected with the midpoint of a certain phase in three-phase bridge arm in converter 1 and 2, and the other end of inductance passes through an electricity
Hold, be connected to midpoint O；Converter 1 and 2 each self-contained 3 pairs or 4 pairs of upper and lower bridge arms, output three-phase three wire system or the three-phase four
Line alternating current；The converter 1 and converter 2 are the full bridge structures of the full bridge structure that three-phase six switchs or four phases eight switch；
Or the converter 1 and converter 2 are multi-level converters.
Meanwhile converter 1 and converter 2 carry out static dynamic passive compensation to power network A and power network B respectively（SVG）Control,
And/or the converter 1 and converter 2 carry out active balance power flowcontrol to power network A and power network B.
The power electronics of the application is flexible coupling switch topology, in addition to the initial power-supply circuit of dc bus, as shown in figure 3,
Two inputs of single-phase transformer connect three phase network A or B two-phase therein, the output end connection two of single-phase transformer respectively
Pole pipe rectifier bridge, the output connection dc bus of diode rectifier bridge；The output end of single-phase transformer and diode rectifier bridge
On connecting line, current-limiting resistance is in series with；On the input of single-phase transformer and the connecting line of power network, panel-switch is in series with.
Control circuit power supply circuit, using the power module of wide input voltage, as shown in figure 4, the input of power module
Connect dc bus, the output end output 24V DC voltages of the power module, in use, being taken from AC line voltage 380V
Electricity, panel-switch push closure state, and by the uncontrollable rectification of diode to dc bus, busbar voltage reaches 537V voltages.
Control system uses the power module of wide input voltage, voltage is changed into 24V DC voltages, then 24V direct currents are pressed into one
Step switchs to control board use+15V ,+5V, ± 15V voltages；As shown in figure 4, No. 2 power panels are female by the direct current of wide input range
Line voltage, 24V DC voltages are converted into, and exported to No. 1 power panel, after No. 1 power panel receives 24V DC voltages, to this
Voltage carries out conversion process, and 1 road 15V voltages of generation are to drive circuitry, and 1 road 5V of generation and all the way ± 15V voltages are to master control
Circuit board is powered.
The present invention is by increasing a PI controller for detecting DC voltage, to keep the voltage of DC link；It is controlled
Strategy is as shown in figure 5, DC bus-bar voltage set-point Udc* to be subtracted to the actual value Udc currently measured, obtained voltage difference
1/2 output is multiplied by as current regulating signal after being sent into pi regulator calculating processing, and the current regulating signal is individually subtracted
Converter 1 and 2 current instantaneous feedback electric current iaf, ibf, obtained current differential are respectively fed to another pi regulator, and such two
Just all contain active current in the instruction current signal of converter, and then also containing certain in the compensation electric current of compensation system
Active current so that the DC side of compensation system and AC positive energy exchange, by DC bus-bar voltage maintain to
Definite value, the output of another PI controllers and power electronics be flexible coupling the current epidemic situation comparison of switch make it is poor, by difference to
Adjust converter 1 and converter 2.
The active balance control method of the present invention, its control strategy is as shown in fig. 6, by DC bus-bar voltage set-point Udc*
The actual value Udc currently measured is subtracted, obtained voltage difference exports after PI controllers calculating processing；By power network A and B electricity
Fluently lock the active component that power network A and B electric current is isolated mutually and after LPF LPF respectively with power network A and B voltage,
After the active component of the power network A and B electric currents and the output summation of above-mentioned PI controllers, 1/2 is multiplied by, obtains converter instruction electricity
Iaref and ibref is flowed, the power network current of the power network A and B is individually subtracted to current instruction current iaref and ibref, obtained
To current differential feedback current i α f, the i β f of converter 1 and converter 2 are individually subtracted again, obtained difference is sent into another PI
Controller, the output of another PI controllers relatively make difference with carrier wave ratio, by difference adjusting converter 1 and converter 2
Output；To realize the active balance between two adjacent network loads, take and divided again after two electric network active electric currents are added
Method, two phase loads are compensated respectively afterwards.
Above-mentioned specific embodiment is familiar its object is to allow simply to illustrate that the technical concept and application characteristic of the present invention
The project planner in this field can understand the Essence of the present invention and be applied, but therefore can not limit this hair
Bright protection domain.Therefore any physical location during practical application is within the protection domain of this patent.It is no matter above
In occur how being described in detail, the present invention can also be implemented with many modes.The details of above-mentioned control mode performs at it
Considerable change can be carried out in details, but it is still contained in the present invention disclosed herein.It is all according to the present invention
The equivalent transformation or modification that Spirit Essence is done, should all be included within the scope of the present invention.
Claims (2)
- The switch topology dc bus stable control method 1. a kind of power electronics is flexible coupling, the power electronics switch that is flexible coupling are opened up The power network A and B for connecting two free voltage grades are flutterred, the power electronics is flexible coupling in switch topology to be included successively：Every From transformer 1, switch 1, wave filter 1, power electronics be flexible coupling switch, wave filter 2, switch 2, isolating transformer 2；The electric power Electronics is flexible coupling to switch to be made up of converter 1 and converter 2, and the DC side of two converters, which links together, forms direct current mother Line, the AC of converter 1 are connected with wave filter 1, and the AC of converter 2 is connected with wave filter 2, the both positive and negative polarity of dc bus Between be connected with DC support electric capacity；Characterized in that, DC bus-bar voltage set-point Udc* is subtracted to the reality currently measured Value Udc, obtained voltage difference is multiplied by 1/2 output as current regulating signal after being sent into pi regulator calculating processing, by described in Current instantaneous feedback electric current iaf, the ibf of converter 1 and 2 is individually subtracted in current regulating signal, and obtained current differential is sent respectively Enter another pi regulator, just all contain active current, and then compensation system in the instruction current signal of such two converter Compensation electric current in also contain active current so that the DC side of compensation system and AC positive energy exchange, by direct current Busbar voltage maintains set-point.
- The switch topology active balance control method 2. a kind of power electronics is flexible coupling, the power electronics be flexible coupling switch topology use In the power network A and B that connect two free voltage grades, the power electronics is flexible coupling in switch topology to be included successively：Isolation becomes Depressor 1, switch 1, wave filter 1, power electronics be flexible coupling switch, wave filter 2, switch 2, isolating transformer 2；The power electronics The switch that is flexible coupling is made up of converter 1 and converter 2, and the DC side of two converters, which links together, forms dc bus, becomes The AC of parallel operation 1 is connected with wave filter 1, and the AC of converter 2 is connected with wave filter 2, between the both positive and negative polarity of dc bus It is connected with DC support electric capacity；Characterized in that, DC bus-bar voltage set-point Udc* is subtracted to the actual value currently measured Udc, obtained voltage difference export after PI controllers calculating processing；Power network A and B electric current are utilized to power network A and B voltage Lock mutually respectively and the active component of power network A and B electric current is isolated after LPF LPF, the power network A's and B electric currents has After the output summation of work(component and above-mentioned PI controllers, 1/2 is multiplied by, converter instruction current iaref and ibref are obtained, by institute Current instruction current iaref and ibref is individually subtracted in the power network current for stating power network A and B, and obtained current differential subtracts respectively again Feedback current iaf, ibf of converter 1 and converter 2 are removed, obtained difference is sent into another PI controllers, another PI controls The output of device relatively makees difference with carrier wave ratio, by difference adjusting the output of converter 1 and converter 2；To realize two adjacent power networks Active balance between load, the method divided again after two electric network active electric currents are added is taken, afterwards to two phase loads Compensate respectively.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN107863893A (en) * | 2017-12-14 | 2018-03-30 | 中机国际工程设计研究院有限责任公司 | The level rectifying system of midpoint self-balancing three |
| CN108183486B (en) * | 2018-01-17 | 2020-08-21 | 中国科学院电工研究所 | Flexible multi-state switch and control method thereof |
| CN113640693A (en) * | 2020-04-24 | 2021-11-12 | 国网江苏省电力有限公司电力科学研究院 | Power electronic transformer operation system and control method |
| CN113726137B (en) * | 2020-05-26 | 2023-11-03 | 台达电子企业管理（上海）有限公司 | conversion device |
| CN118017808B (en) * | 2024-04-08 | 2024-07-16 | 深圳市恒运昌真空技术股份有限公司 | Cascaded solid-state transformer and power balance control method |
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