CN106301057A - A kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device - Google Patents
A kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device Download PDFInfo
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- CN106301057A CN106301057A CN201510239462.3A CN201510239462A CN106301057A CN 106301057 A CN106301057 A CN 106301057A CN 201510239462 A CN201510239462 A CN 201510239462A CN 106301057 A CN106301057 A CN 106301057A
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Abstract
The invention provides a kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device, including: battery energy storage unit, two-way DC/AC current transformer, filter inductance, source of resistance network, wholly-controled device and control system；Wherein battery energy storage unit positive pole connects the anode of two-way DC/AC current transformer, and two-way DC/AC current transformer negative terminal connects source of resistance network input, and source of resistance network output connects battery energy storage unit negative pole, and its two other port connects wholly-controled device.Two-way DC/AC current transformer output three-phase alternating current, connects electrical network by filter inductance.This device realizes buck conversion, and DC side input voltage may vary broadly.In two-way DC/AC current transformer, upper and lower two the full-control type power devices of same brachium pontis can simultaneously turn on, and changer functional reliability is high.Being not required in modulation add dead band, output harmonic wave content is low.Compared to Conventional impedance source type inverter, this device can realize energy in bidirectional flow, and under same boost capability, this device capacitance voltage stress is less.
Description
Technical field
The present invention relates to a kind of converters device, be specifically related to a kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device.
Background technology
Renewable energy power generation and correlation technique thereof with photovoltaic, wind-power electricity generation as representative develop rapidly, but by meteorological factor influence, it is exerted oneself and presents the feature of intermittence, undulatory property and uncontrollability, causes its grid connection capacity limited.And the energy storage technology with battery energy storage as representative has become the most effective approach solving renewable energy source power problem at present.
Energy-storage system of accumulator generally includes batteries to store energy unit and the grid-connected interface circuit being made up of power electronic devices.The generally DC voltage of batteries to store energy unit output is relatively low, and along with battery is exerted oneself change, DC voltage fluctuation is bigger, it is difficult to meet the requirement of combining inverter side, so typically promoting at the indirect one-level two-way DC/DC changer of accumulator output and inverter and stablize accumulator output voltage.This two-layer configuration can ensure that inverter the most normally works, but owing to being Two Stages, inefficient, system bulk, cost increase.Inverter typically uses voltage source inverter, and its same brachium pontis does not allow to occur to lead directly to, and otherwise will damage inverter, and functional reliability is relatively low.For preventing from leading directly to, in modulated signal, generally add Dead Time, thus cause output waveform to be distorted.
For solving the problems referred to above, it is proposed that a kind of source of resistance type inverter, realize buck conversion by adding a passive network being made up of inductance and electric capacity between direct current input side and inverter bridge.Saying from the angle of power conversion, Z-source inverter is single step arrangement, in hgher efficiency.Meanwhile, it allows upper and lower two switching tubes of the same brachium pontis of inverter bridge to simultaneously turn on, and functional reliability is high.Owing to eliminating the Dead Time in conventional inverter, output waveform better quality.Comparing two-layer configuration, the volume cost of system is the lowest.But Conventional impedance source type inverter also has the defect of himself: (1) capacitance voltage stress is high；(2) inrush current is big；(3) there will be abnormal operating state during underloading；(4) energy cannot two-way flow.
Summary of the invention
For overcoming drawbacks described above, the invention provides a kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device, remain Conventional impedance source inventer and allow bridge arm direct pass, output waveform distortion is little and the advantage that possesses buck ability to transform, overcoming Conventional impedance source inventer inrush current big, capacitance voltage stress is high and energy cannot the shortcoming of two-way flow simultaneously.Comparing two-layer configuration, functional reliability is high, and volume cost is less.
For achieving the above object, the present invention provides a kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device, including: battery energy storage unit, two-way DC/AC current transformer, filter inductance, source of resistance network, wholly-controled device and control system；It is characterized in that: described battery energy storage unit, two-way DC/AC current transformer, filter inductance and source of resistance network are sequentially connected with；
Battery energy storage unit positive pole is connected with the anode of two-way DC/AC current transformer, two-way DC/AC current transformer negative terminal is connected with source of resistance network input, source of resistance network output is connected with battery energy storage unit negative pole, other two ports of source of resistance network connect wholly-controled device, two-way DC/AC current transformer output three-phase alternating current, is connected with electrical network by filter inductance.
Battery energy storage unit is lithium battery, Ni-MH battery or lead-acid battery.
Two-way DC/AC current transformer is made up of three brachium pontis；Each brachium pontis is made up of upper and lower two full-control type power devices；Full-control type power device is IGBT module；IGBT module is with anti-paralleled diode.
Upper and lower two the full-control type power devices of same brachium pontis of two-way DC/AC current transformer can simultaneously turn on.
Filter inductance is made up of three equivalent inductances, connects an equivalent inductance between the output of two-way DC/AC current transformer each brachium pontis and electrical network.
Source of resistance network is made up of two equivalent inductances of L1 and L2 and C1 and C2 and two equivalent capacitances；Two electric capacity are that X-shaped is placed；It is not connected between two electric capacity；
Electric capacity C1 anode is connected with inductance L2 right-hand member, and electric capacity C1 negative terminal is connected with inductance L1 left end；Electric capacity C2 anode is connected with inductance L2 left end, and electric capacity C2 negative terminal is connected with inductance L1 right-hand member.
Wholly-controled device is IGBT module；IGBT module is with anti-paralleled diode；IGBT module S7 represents；The emitter stage of S7 is connected with electric capacity C2 negative terminal, and the colelctor electrode of S7 is connected with electric capacity C1 anode.
Control system gathers the voltage x current amount of current transformer, and produces the driving signal of each switching device according to set control strategy.
With immediate prior art ratio, the present invention has following excellent effect: utilizing single step arrangement to realize the buck conversion of tradition two-layer configuration, in hgher efficiency, volume cost is little；Allowing the same brachium pontis of inverter to lead directly to up and down, functional reliability is higher；Without Dead Time, output waveform distortion is little；Step-up ratio is controlled, it is allowed to input side cell voltage width range；Compared to Conventional impedance source inventer, can realize energy in bidirectional flow, capacitance voltage stress is less.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention a kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device.
Fig. 2 is the control strategy schematic diagram of the present invention a kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device.
Detailed description of the invention
The present invention will be further described in detail with detailed description of the invention below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of a kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device proposed by the invention, including battery energy storage unit, two-way DC/AC current transformer, filter inductance, source of resistance network, wholly-controled device and control system；Described battery energy storage unit, two-way DC/AC current transformer, filter inductance and source of resistance network are sequentially connected with.
Battery energy storage unit is lithium battery, Ni-MH battery or lead-acid battery.Battery energy storage unit positive pole is connected with the anode of two-way DC/AC current transformer, two-way DC/AC current transformer negative terminal is connected with source of resistance network input, source of resistance network output is connected with battery energy storage unit negative pole, its two other port is connected with wholly-controled device, two-way DC/AC current transformer output three-phase alternating current, is connected with electrical network by filter inductance.Control system gathers the voltage x current amount of current transformer, produces each switching device according to set control strategy and drives signal.
Two-way DC/AC current transformer is made up of three brachium pontis；Each brachium pontis is made up of upper and lower two full-control type power devices；Full-control type power device is IGBT (Insulated Gate Bipolar Transistor, the insulated gate bipolar transistor) module with anti-paralleled diode, and the full-control type power device of three brachium pontis represents with S1-S6 successively；Wherein, upper and lower two the full-control type power devices of same brachium pontis can simultaneously turn on.
Filter inductance is made up of three equivalent inductances, connects an equivalent inductance between the output of two-way DC/AC current transformer each brachium pontis and electrical network.
Source of resistance network is made up of two equivalent inductances of L1 and L2 and two equivalent capacitances of C1 and C2, and two equivalent capacitances are that X-shaped is placed, and are not connected between two equivalent capacitances；Equivalent capacitance C1 anode connects equivalent inductance L2 right-hand member, and C1 negative terminal connects L1 left end, and equivalent capacitance C2 anode connects L2 left end, and C2 negative terminal connects L1 right-hand member.
Wholly-controled device S7 is IGBT (the Insulated Gate Bipolar Transistor with anti-paralleled diode, insulated gate bipolar transistor) module, the emitter stage of S7 connects equivalent capacitance C2 negative terminal, and the colelctor electrode of S7 connects equivalent capacitance C1 anode.
A kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device boosting mode that the present invention proposes is identical with Conventional impedance source inventer, boost function is realized by adding straight-through zero state in tradition zero state, straight-through zero state becomes changer one normal operating conditions, device functional reliability is higher, being not required to add Dead Time, output waveform distortion is little.During steady operation, battery side output voltage VdcWith two-way DC/AC current transformer side input voltage ViRelation beWherein D0For straight-through zero state dutycycle, in the range from: 0≤D0＜ 0.5.As battery energy storage unit output voltage VdcDuring change, by regulation D0I.e. can ensure that two-way DC/AC current transformer side input voltage ViConstant.
During Conventional impedance source inventer steady operation, voltage V on equivalent capacitance in its source of resistance networkCWith battery side output voltage VdcRelation be:As 0≤D0During ＜ 0.5, VC≥Vdc, so capacitance voltage will be above battery side output voltage.During changer steady operation in technical solution of the present invention, voltage V on equivalent capacitanceCWith battery side output voltage VdcRelation be:As 0≤D0During ＜ 0.5, VC≤Vdc, equivalent capacitance voltage is less than battery side output voltage, and source of resistance network capacitance voltage stress relatively Conventional impedance source inventer is lower.
The source of resistance type Technics of Power Electronic Conversion device being applicable to battery energy storage that the present invention proposes possesses energy in bidirectional flow function, and energy flows to power control process as shown in Figure 2.The process that controls in Fig. 2 is divided into two-way DC/AC current transformer side to control and battery energy storage side controls.Two-way DC/AC current transformer side control process: active power command value PsetWith reactive power command value QsetGiven by outside.Wherein work as PsetFor on the occasion of time, changer is operated in inverter mode, and energy is flowed to electrical network by battery side；Work as PsetDuring for negative value, changer is operated in PWM rectification state, and energy is flowed to battery by grid side.Two command value and the active-power P of actual outputout, reactive power QoutDoing difference, error obtains watt current after pi regulator and gives Id_refI is given with reactive currentq_ref.The three-phase output electric current i of two-way DC/AC current transformerabcThrough coordinate transform, obtain real component idWith idle component iq, do difference with meritorious, reactive current set-point respectively, error merges with Feedforward Decoupling link after pi regulator, obtains the voltage reference value U of correspondenced_refAnd Uq_ref, two reference values are by SVPWM algorithm, with the straight-through duty cycle signals D that battery side controls generation0After coupling, obtain the driving signal of S1-S6 and wholly-controled device S7 in corresponding two-way DC/AC current transformer.
Battery energy storage side is by controlling straight-through dutycycle D0Complete two-way DC/AC current transformer input side voltage ViControl, due to ViCan not directly detect for high frequency rectangular ripple, but ViWith capacitance voltage VCWith cell voltage VdcBetween there is following relation:By controlling equivalent capacitance voltage VCConstant, can indirectly complete ViConstant control.Control process: capacitance voltage set-point VC_refWith actual value VCDo difference, after pi regulator, led directly to duty cycle signals D accordingly0, the signal controlling to produce by SVPWM module and current transformer side couples, and produces the driving signal of all wholly-controled device.
The control signal of wholly-controled device S7 is complementary with through connect signal, and i.e. when current transformer works in straight-through zero state, S7 turns off；When current transformer works in non-straight-through zero state, S7 turns on.
Last it should be noted that present invention and detailed description of the invention are intended to illustrate the actual application of technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art inspired by the spirit and principles of the present invention, various amendments, equivalent or improve.But these changes or amendment are all in the protection domain that application is awaited the reply.
Claims (8)
1. a source of resistance type battery energy storage Technics of Power Electronic Conversion device, including: battery energy storage unit, two-way
DC/AC current transformer, filter inductance, source of resistance network, wholly-controled device and control system；It is characterized in that:
Described battery energy storage unit, two-way DC/AC current transformer, filter inductance and source of resistance network are sequentially connected with；
Described battery energy storage unit positive pole is connected with the anode of two-way DC/AC current transformer, two-way DC/AC unsteady flow
Device negative terminal is connected with source of resistance network input, and source of resistance network output is connected with battery energy storage unit negative pole,
Other two ports of source of resistance network connect wholly-controled device, two-way DC/AC current transformer output three-phase alternating current
Electricity, is connected with electrical network by filter inductance.
Device the most according to claim 1, it is characterised in that: described battery energy storage unit be lithium battery,
Ni-MH battery or lead-acid battery.
Device the most according to claim 1, it is characterised in that: described two-way DC/AC current transformer is by three
Individual brachium pontis forms；Each brachium pontis is made up of upper and lower two full-control type power devices；
Described full-control type power device is IGBT module；
Described IGBT module is with anti-paralleled diode.
Device the most according to claim 3, it is characterised in that: described two-way DC/AC current transformer same
One upper and lower two full-control type power device of brachium pontis can simultaneously turn on.
5. according to the device described in claim 1 or 4, it is characterised in that: described filter inductance is by three etc.
Value inductance composition, connects an equivalent inductance between the output of two-way DC/AC current transformer each brachium pontis and electrical network.
Device the most according to claim 1, it is characterised in that: described source of resistance network is by L1 and L2
Two equivalent inductances and C1 and C2 and two equivalent capacitances form；Two electric capacity are that X-shaped is placed；Two
It is not connected between electric capacity；
Electric capacity C1 anode is connected with inductance L2 right-hand member, and electric capacity C1 negative terminal is connected with inductance L1 left end；Electric capacity
C2 anode is connected with inductance L2 left end, and electric capacity C2 negative terminal is connected with inductance L1 right-hand member.
Device the most according to claim 1, it is characterised in that: described wholly-controled device is IGBT module；
IGBT module is with anti-paralleled diode；IGBT module S7 represents；The emitter stage of S7 and electric capacity C2 negative terminal
Connecting, the colelctor electrode of S7 is connected with electric capacity C1 anode.
8. according to the device described in claim 1,3 or 4, it is characterised in that: described control system collection
The voltage x current amount of described two-way DC/AC current transformer.
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| CN201510239462.3A CN106301057A (en) | 2015-05-12 | 2015-05-12 | A kind of source of resistance type battery energy storage Technics of Power Electronic Conversion device |
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Citations (3)
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|---|---|---|---|---|
| US20120081936A1 (en) * | 2010-09-30 | 2012-04-05 | Intersil Americas Inc. | System and method for converting an ac input voltage to a regulated dc output voltage using a z-type converter with rectified switches |
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| CN104578881A (en) * | 2015-01-23 | 2015-04-29 | 北京理工大学 | Novel Z-source grid-connected inverter |
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2015
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120081936A1 (en) * | 2010-09-30 | 2012-04-05 | Intersil Americas Inc. | System and method for converting an ac input voltage to a regulated dc output voltage using a z-type converter with rectified switches |
| CN202678980U (en) * | 2012-05-07 | 2013-01-16 | 雷霖 | Three-phase photovoltaic grid-connection system based on novel Z-source inverter |
| CN104578881A (en) * | 2015-01-23 | 2015-04-29 | 北京理工大学 | Novel Z-source grid-connected inverter |
Non-Patent Citations (5)
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| JUKUI WEI等: "Grid-connected PV system based on the series Z-Source inverter", 《2010 5TH IEEE CONFERENCE ON INDUSTRIAL ELECTRONICS AND APPLICATIONS》 * |
| TANG YU等: "Improved Z-Source Inverter With Reduced Z-Source Capacitor Voltage Stress and Soft-Start Capability", 《IEEE TRANSACTIONS ON POWER ELECTRONICS》 * |
| 丁久东: "具有无功补偿功能的串联型Z源并网逆变器研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Application publication date: 20170104 |