CN108111033A - A kind of active power decoupling type single-phase grid-connection converter based on circuit of reversed excitation - Google Patents

A kind of active power decoupling type single-phase grid-connection converter based on circuit of reversed excitation Download PDF

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Publication number
CN108111033A
CN108111033A CN201611086781.6A CN201611086781A CN108111033A CN 108111033 A CN108111033 A CN 108111033A CN 201611086781 A CN201611086781 A CN 201611086781A CN 108111033 A CN108111033 A CN 108111033A
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CN
China
Prior art keywords
decoupling
switch pipe
circuit
power
side switch
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Pending
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CN201611086781.6A
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Chinese (zh)
Inventor
陈仲
袁涛
李梦南
许亚明
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Priority to CN201611086781.6A priority Critical patent/CN108111033A/en
Publication of CN108111033A publication Critical patent/CN108111033A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention discloses a kind of active power decoupling type single-phase grid-connection converters based on circuit of reversed excitation.Main circuit of converter topology includes DC power supply, input capacitance, primary side switch pipe, isolating transformer, secondary-side switch pipe, filter circuit, power grid and active power decoupling circuit.The present invention adds the active power decoupling circuit being made of decoupling switch pipe, decoupling diode and decoupling capacitance in current transformer input side, it is effective to have decoupled the DC supply input side low frequency power pulsation as caused by output AC power, it can realize grid-connected simultaneously, ensure that the long life of current transformer.

Description

A kind of active power decoupling type single-phase grid-connection converter based on circuit of reversed excitation
Technical field
The present invention relates to a kind of active power decoupling type single-phase grid-connection converter based on circuit of reversed excitation, belong to isolation, simultaneously Net current transformer realizes the decoupling of direct current input side power pulsations using increased active power decoupling circuit.
Background technology
In grid-connected power generation system, the output power of grid-connected converter contains the power ripple of twice of mains frequency, and Input power is controlled as the imbalance problem of constant power, input power and output power, is usually electrolysed by simultaneously the United Nations General Assembly Capacitance solves.Since the frequency of power ripple is only twice of power frequency, required capacitance compares larger, and electrolytic capacitor Service life be also limited, seriously affected service life and the stability of grid-connected converter.Decoupling power ripple is studied therefore Method, greatly reduce capacitance needed for current transformer, capacity is small, capacitance of long lifespan is replaced so as to select Electrolytic capacitor achievees the purpose that the whole service life for extending current transformer, is of great significance.
The content of the invention
It is a kind of based on circuit of reversed excitation it is an object of the invention to be provided for the technological deficiency present in above-mentioned current transformer Active power decoupling type single-phase grid-connection converter, it is grid-connected not only to have realized single-stage, but also has decoupled the pulsation of direct current input side low frequency power.
The present invention to achieve the above object, adopts the following technical scheme that：
A kind of active power decoupling type single-phase grid-connection converter based on circuit of reversed excitation, including DC power supply, input capacitance, Primary side switch pipe, isolating transformer, secondary-side switch pipe, filter circuit and power grid；The anode of wherein DC power supply connects input capacitance One end, the cathode of DC power supply, the other end of input capacitance be connected with the emitter of primary side switch pipe, primary side switch pipe Collector connects the Same Name of Ends of isolating transformer primary side winding, and isolating transformer secondary includes two windings, and secondary-side switch pipe includes Two switching tubes, filter circuit include a filter capacitor and a filter inductance, the termination of the same name first of the first vice-side winding The collector of secondary-side switch pipe, the different name of the second vice-side winding terminate the emitter of the second secondary-side switch pipe, the first vice-side winding Different name end, the Same Name of Ends of the second vice-side winding, one end of one end of filter capacitor and power grid be connected, filter capacitor it is another The one end at end, the emitter of the first secondary-side switch pipe, the collector of the second secondary-side switch pipe and filter inductance is connected, filtered electrical The other end that the other end of sense gets access to grid；It is characterized in that：
Further include active power decoupling circuit；Wherein active power decoupling circuit includes a decoupling capacitance, a decoupling Switching tube and two decoupling diodes, anode, one end of decoupling capacitance and the anode phase of DC power supply of the first decoupling diode Connection, cathode, the emitter of decoupling switch pipe of the first decoupling diode are connected with the different name end of isolating transformer primary side winding It connects, the cathode of the collector of decoupling switch pipe, the other end of decoupling capacitance and the second decoupling diode is connected, the second decoupling two The anode of pole pipe connects the collector of primary side switch pipe.
Advantageous effect：
The present invention discloses a kind of active power decoupling type single-phase grid-connection converters based on circuit of reversed excitation, have decoupled straight The pulsation of mains input side low frequency power is flowed, the service life of system can be extended.Major technique of the present invention compared with original technology Feature is to be pulsed by adding in active power decoupling circuit in flyback converter primary side come processing power, avoids inputting in direct current The electrolytic capacitor that side parallel connection volume is big, reliability is low carrys out smooth input power.
Description of the drawings
Attached drawing 1 is a kind of active power decoupling type single-phase grid-connection converter main circuit based on circuit of reversed excitation of the present invention Figure.
Attached drawing 2 be the present invention a kind of active power decoupling type single-phase grid-connection converter based on circuit of reversed excitation further etc. Imitate circuit diagram.
Attached drawing 3 is a kind of active power decoupling type single-phase grid-connection converter groundwork based on circuit of reversed excitation of the present invention Waveform diagram.
4~attached drawing of attached drawing 9 is a kind of active power decoupling type single-phase grid-connection converter based on circuit of reversed excitation of the present invention Each switch mode schematic diagram.
Attached drawing 10 is input current, decoupling capacitance voltage and the grid-connected electricity that the present invention is applied to 110V/50Hz AC networks The simulation waveform of stream.
Primary symbols title in above-mentioned attached drawing：Vi, supply voltage.Ci, input capacitance.Sp, primary side switch pipe.Ss1、Ss2、 It is secondary-side switch pipe.Sx, be decoupling switch pipe.Dx1、Dx2, be decoupling diode.Cx, decoupling capacitance.T, isolating transformer. Np、Ns1、Ns2, isolating transformer winding.Lm, isolating transformer magnetizing inductance.Lf, filter inductance.Cf, filter capacitor.vx, decoupling Capacitance voltage.vgrid, network voltage.
Specific embodiment
The technical solution of invention is described in detail below in conjunction with the accompanying drawings：
Attached drawing 1 is a kind of active power decoupling type single-phase grid-connection converter main circuit based on circuit of reversed excitation.By direct current Source Vi, input capacitance 1, primary side switch pipe 2, isolating transformer 3, secondary-side switch pipe 4, filter circuit 5, power grid 6 and active power Decoupling circuit 7 forms.SpIt is primary side switch pipe, CiIt is input capacitance, SxIt is decoupling switch pipe, Dx1、Dx2It is to decouple diode, Cx It is decoupling capacitance, T is isolating transformer, Ss1、Ss2It is secondary-side switch pipe, LfIt is output inductor, CfIt is output filter capacitor. It, can be by attached drawing 1 etc. for the ease of analysis since isolating transformer is similar to an ideal transformer with specific magnetizing inductance It imitates as attached circuit shown in Fig. 2.
Below with it is attached it is shown in Fig. 2 it is equivalent after main circuit structure, with reference to 3~attached drawing of attached drawing 9 describe the present invention it is specific Operation principle.Since the input power that DC power supply provides is constant, and output power is the pulsating quantity for including secondary ripple wave, It is divided into two kinds according to the operating mode of input power and the big wisp circuit of instantaneous output, as input power PiMore than instantaneous Output power poWhen, circuit works in 1 state of pattern, as input power PiLess than instantaneous output poWhen, circuit works in mould 2 state of formula.When understanding that current transformer works in pattern 1 or pattern 2 by attached drawing 3, a switch periods TsThere are 4 kinds of switching moldings State, during pattern 1：[t10-t11]、[t11-t12]、[t12-t13]、[t13-t14], during pattern 2：[t20-t21]、[t21-t22]、[t22- t23]、[t23-t24].Below when network voltage is in positive half period exemplified by, the working condition of each switch mode is carried out specific Analysis；It is similar when working condition is with positive half period when network voltage is in negative half-cycle, it repeats no more.
Before analysis, first make the following assumptions：1. all power devices are preferable；2. isolating transformer original secondary circle Than for：Np∶Ns1∶Ns2=1: n: n.
When under pattern 1, specific works situation：
1. switch 1 [t of mode10-t11] [corresponding to attached drawing 4]
t10Moment, primary side switch pipe SpIt is open-minded, transformer magnetizing inductance LmStart energy storage, primary current ipStart from scratch line Property rise.t11Moment, electric current ipReach reference value I1_ref, which terminates.
2. switch 2 [t of mode11-t12] [corresponding to attached drawing 5]
t11Moment, switching tube SpShut-off, transformer magnetizing inductance electric current is through decoupling diode Dx2, decoupling capacitance CxAnd decoupling Diode Dx1Afterflow, transformer magnetizing inductance bear decoupling capacitance backward voltage, since the switching frequency of current transformer is high, at one Decoupling capacitance voltage can see definite value, primary current i as in switch periodspLinear decline, when it drops to reference value ip_refWhen, Secondary-side switch pipe is open-minded, this mode terminates.
Current reference value ip_refIt is represented by
Wherein, TsFor switch periods, PiFor input power, ω is network voltage angular frequency.
3. switch 3 [t of mode12-t13] [corresponding to attached drawing 6]
t12Moment opens secondary-side switch pipe Ss1.Since the voltage of transformer secondary conversion to primary side is less than on decoupling capacitance Voltage, decoupling diode bear backward voltage cut-off, transformer magnetizing inductance to power grid convey electric energy.In this stage, secondary Electric current isBy reference value ip_ref/ n linearly decreases to zero.
4. switch 4 [t of mode13-t14] [corresponding to attached drawing 9]
t13Moment, secondary current isDrop to zero.In this stage, secondary-side switch pipe still turns on, but without electric current It flows through.t14At the moment, the shut-off of secondary-side switch pipe, this operation mode terminates, and the switch periods terminate, into next switch week Phase.
When under pattern 2, specific works situation：
1. switch 1 [t of mode20-t21] [corresponding to attached drawing 8]
t20Moment, while open decoupling switch pipe SxWith primary side switch pipe Sp, transformer magnetizing inductance bears decoupling capacitance The sum of voltage and direct current power source voltage, primary current ipLinear rise, when it rises to reference value ip_2When, decoupling switch pipe SxIt closes Disconnected, this mode terminates.
2. switch 1 [t of mode21-t22] [corresponding to attached drawing 9]
t21Moment, since transformer magnetizing inductance bears direct current power source voltage, primary current ipBy reference value ip_2On continuing It rises, when it rises to reference value ip_refWhen, primary side switch pipe SpShut-off, this mode terminate.
It can obtain 2 current reference value i of patternp_2Expression formula is：
3. switch 3 [t of mode22-t23] [corresponding to attached drawing 6]
t22Moment, when network voltage be timing, secondary-side switch pipe Ss1Always it is open-minded under pattern 2, transformer magnetizing inductance It releases energy to power grid.As secondary current isBy reference value ip_refWhen/n linearly decreases to zero, this mode terminates.
4. switch 4 [t of mode23-t24] [corresponding to attached drawing 7]
In this stage, secondary-side switch pipe still turns on, but no electric current flows through, until the switch periods terminate, enters Next switch periods.
Figure 10 is the input current I that the present invention is applied to 110V/50Hz AC networksi, decoupling capacitance voltage vxWith grid-connected electricity Flow igridSimulation waveform.From simulation waveform, the present invention can be effectively decoupled the low frequency power pulsation of direct current input side.
From above description it is known that a kind of active power decoupling type based on circuit of reversed excitation proposed by the present invention is single-phase Grid-connected converter has the advantages that following several respects：
1) increased active power decoupling circuit assumes responsibility for power pulsations, effectively inhibits output ripple power to direct current Mains side transfers.
2) component is relatively fewer, controls simple easily realization.
3) decoupling capacitance also acts as the buffering capacitance for absorbing leakage inductance energy in isolating transformer, solves what leakage inductance was brought Problem.

Claims (1)

1. a kind of active power decoupling type single-phase grid-connection converter based on circuit of reversed excitation, including DC power supply, input capacitance (1), primary side switch pipe (2), isolating transformer (3), secondary-side switch pipe (4), filter circuit (5) and power grid (6)；Wherein direct current The anode in source connects one end of input capacitance (1), the cathode of DC power supply, the other end of input capacitance (1) and primary side switch pipe (2) Emitter be connected, the collector of primary side switch pipe (2) connects the Same Name of Ends of isolating transformer (3) primary side winding, isolates transformation Device (3) secondary includes two windings, and secondary-side switch pipe (4) includes two switching tubes, and filter circuit (5) includes a filter capacitor With a filter inductance, the collector of the termination of the same name first secondary-side switch pipe of the first vice-side winding, the second vice-side winding it is different The emitter of name the second secondary-side switch pipe of termination, the different name end of the first vice-side winding, the Same Name of Ends of the second vice-side winding, filtered electrical One end of appearance and one end of power grid (6) are connected, the other end of filter capacitor, the emitter of the first secondary-side switch pipe, the second pair The collector of side switching tube and one end of filter inductance are connected, and the other end of filter inductance gets access to grid the other end of (6)；It is special Sign is：
Further include active power decoupling circuit (7)；Wherein active power decoupling circuit (7) includes a decoupling capacitance, a solution Coupling switching tube and two decoupling diodes, anode, one end of decoupling capacitance and the anode of DC power supply of the first decoupling diode It is connected, cathode, the emitter of decoupling switch pipe and the different name end of isolating transformer (3) primary side winding of the first decoupling diode It is connected, the cathode of the collector of decoupling switch pipe, the other end of decoupling capacitance and the second decoupling diode is connected, the second solution The anode of coupling diode connects the collector of primary side switch pipe (2).
CN201611086781.6A 2016-11-25 2016-11-25 A kind of active power decoupling type single-phase grid-connection converter based on circuit of reversed excitation Pending CN108111033A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112260567A (en) * 2020-10-23 2021-01-22 上海海事大学 Non-isolated grid-connected inverter with active power decoupling function

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102522766A (en) * 2011-11-04 2012-06-27 浙江大学 Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof
CN104022655A (en) * 2014-06-24 2014-09-03 上海大学 Electrolytic capacitor-free LED driving power supply based on flyback converter leakage inductance energy utilization
CN105375800A (en) * 2015-09-21 2016-03-02 浙江恩沃新能源科技有限公司 A topological circuit for a micro-inverter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102522766A (en) * 2011-11-04 2012-06-27 浙江大学 Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof
CN104022655A (en) * 2014-06-24 2014-09-03 上海大学 Electrolytic capacitor-free LED driving power supply based on flyback converter leakage inductance energy utilization
CN105375800A (en) * 2015-09-21 2016-03-02 浙江恩沃新能源科技有限公司 A topological circuit for a micro-inverter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112260567A (en) * 2020-10-23 2021-01-22 上海海事大学 Non-isolated grid-connected inverter with active power decoupling function
CN112260567B (en) * 2020-10-23 2022-02-22 上海海事大学 Non-isolated grid-connected inverter with active power decoupling function

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Application publication date: 20180601