CN102983729A - Suppressor and suppression method for secondary pulse of DC side voltage of multiplexing inverter - Google Patents
Suppressor and suppression method for secondary pulse of DC side voltage of multiplexing inverter Download PDFInfo
- Publication number
- CN102983729A CN102983729A CN201210559363XA CN201210559363A CN102983729A CN 102983729 A CN102983729 A CN 102983729A CN 201210559363X A CN201210559363X A CN 201210559363XA CN 201210559363 A CN201210559363 A CN 201210559363A CN 102983729 A CN102983729 A CN 102983729A
- Authority
- CN
- China
- Prior art keywords
- inductance
- voltage
- capacitor
- current
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention provides a suppressor and a suppression method for secondary pulse of DC (direct current) side voltage of a multiplexing inverter. The suppressor and the suppression method aim at solving the technical problem that when negative sequence current compensation is conducted by the existing functional multiplexing converter, the secondary pulse of the DC side capacitor voltage is caused. The suppressor consists of a DC side unit, a functional multiplexing interface converter unit, an inverter output filter unit and a passive tertiary harmonic filter unit. The suppression method comprises the steps that power of the secondary pulse absorbed by the functional multiplexing interface converter in compensating a load negative sequence current component is released in a form of AC (alternating current) side tertiary harmonic current, and the secondary pulse of the DC side capacitor voltage is suppressed. The suppressor and the suppression method have the benefits that the secondary pulse of the DC side voltage of the multiplexing inverter can be effectively suppressed by the suppressor and the suppression method, deficiencies of the prior art are overcome, the service life of a capacitor of the inverter is prolonged, and the performance of the inverter is improved.
Description
Technical field
The invention belongs to distributed energy unit converters and quality of power supply technical field, be specifically related to a kind of inhibitor and inhibition method of secondary pulsation of multiplexing functions type interface current transformer dc voltage.
Background technology
In recent years, new energy technology has been obtained fast development.A large amount of distributed energy unit as: wind power generation, solar power generation, fuel cell and energy-storage system have accessed by the interface current transformer among the distributed power system.Yet a large amount of uses of unbalanced load and non-linear device in the distributed power system, produced power quality problems such as harmonic current, negative-sequence current, zero-sequence current, reactive current, safety to grid-connection device works the mischief, and has caused people's extensive concern.
In recent years, more and more researchers begin to pay close attention to the multiplexing functions research of distributed unit interface current transformer, namely use the net side interface current transformer of distributed energy unit to carry out reactive power compensation, unsymmetrical current compensation and harmonic compensation, take full advantage of existing device to reach, improve the purpose of the electrical network quality of power supply.That the use three-phase PWM photovoltaic interface current transformer of introducing such as Chinese patent CN 101697418 A " microgrid photovoltaic inversion be incorporated into the power networks and harmonic wave control hybrid system and composite control method thereof " carries out is idle, imbalance and harmonic compensation.Yet the dc capacitor voltage that multiplexing functions type interface current transformer will cause when carrying out the negative-sequence current compensation produces the secondary pulsation.When current transformer carries out the negative-sequence current compensation, will absorb the secondary pulsating power, this secondary pulsating power is flowed through will cause the pulsation of dc capacitor voltage secondary behind the dc bus capacitor, the secondary pulsation of current transformer dc capacitor voltage will cause the distortion of ac output current, thereby affect the harmonic compensation effect, cause new harmonic problem.Among power distribution network static reacance generator (D-STATCOM) is used, also there are the problems referred to above.And, among the wind power generation application, the normal operation that the pulsation of dc capacitor voltage secondary also will endanger generator.Therefore, how studying, the dc capacitor voltage secondary pulsation of inhibit feature composite interface current transformer has important theory significance and practical value.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, for the technical barrier of multiplexing functions type interface current transformer in the dc capacitor voltage secondary pulsation of carrying out causing when negative-sequence current compensates, a kind of inhibitor and inhibition method of secondary pulsation of composite DC side voltage of converter proposed.The present invention absorbs multiplexing functions type interface current transformer because of the compensating load negative-sequence current component secondary pulsating power with the form release of AC triple harmonic current, thereby suppresses the generation that the dc capacitor voltage secondary is pulsed; The triple harmonic current that simultaneously current transformer is produced adopts one group of passive triple frequency harmonic filter to absorb, thereby solves above-mentioned technical barrier.Inhibitor structure and inhibition method that the present invention is concrete are respectively:
The inhibitor of the secondary pulsation of composite DC side voltage of converter of the present invention, comprise DC side unit 10, multiplexing functions type interface converter cell 20 and inverter output filter unit 30, wherein, DC side unit 10 is comprised of a capacitor C _ DC, multiplexing functions type interface converter cell 20 is comprised of six IGBT pipes and six anti-paralleled diodes, i.e. IGBT pipe S
1, the 2nd IGBT manages S
2, the 3rd IGBT manages S
3, the 4th IGBT manages S
4, the 5th IGBT manages S
5, the 6th IGBT manages S
6, the first diode D
1, the second diode D
2, the 3rd diode D
3, the 4th diode D
4, the 5th diode D
5With the 6th diode D
6Inverter output filter unit 30 is by inductance L
f_ A, inductance L
f_ B and inductance L
f_ C forms; One side of inverter output filter unit 30 is connected with DC side unit 10 through multiplexing functions type interface converter cell 20, and wherein, the opposite side of inverter output filter unit 30 is provided with passive triple frequency harmonic filter unit 40; Described passive triple frequency harmonic filter unit 40 is comprised of inductance L _ A, inductance L _ B, inductance L _ C, capacitor C 1, capacitor C 2 and capacitor C 3, and wherein the end of inductance L _ A, inductance L _ B and inductance L _ C links together; The other end of inductance L _ A is connected with capacitor C 1, the other end of capacitor C 1 and inductance L
f_ A is connected; The other end of inductance L _ B is connected with capacitor C 2, the other end of capacitor C 2 and inductance L
f_ B is connected; The other end of inductance L _ C is connected with capacitor C 3, the other end of capacitor C 3 and inductance L
f_ C is connected.
The secondary of composite DC side voltage of converter of the present invention pulsation inhibition method is to adopt on the basis of the inhibitor that the present invention proposes, and carries out as follows:
1) on three phase network to be measured and the cable between the unbalanced load, gets place's points of common connection (Point of Common Coupling, PCC), with sample tap A, the sample tap B of multiplexing functions combining inverter and three nodes at sample tap C and PCC place, be node A, Node B and node C, connect one by one; The voltage Vpcc_a, the load current I that obtain respectively at the PCC place
Load_A, voltage Vpcc_b, load current I
Load_B, voltage Vpcc_c and load current I
Load_CMeasure the magnitude of voltage V at dc bus capacitor C_DC two ends
C_DC Inverter output filter 30 inductance L are flow through in measurement
fThe current value I at _ A place
Lf_A, inductance L
fThe current value I at _ B place
Lf_BAnd inductance L
fThe current value I at _ C place
Lf_C
2) according to the dc capacitor voltage value V that measures
C_DC,Calculate the secondary voltage ripple value of feedback V of dc capacitor voltage by the second harmonic filter
Ripple, wherein use second harmonic filter computing formula to be:
3) with dc capacitor voltage secondary ripple command value Ref and secondary voltage ripple value of feedback V
RippleIt is poor to do, and obtains the secondary voltage ripple error value e of dc capacitor voltage
Ripple, input secondary ripple adjuster, wherein, secondary ripple adjuster transfer function is:
Wherein:
,
Be the prescription dosage regulating device parameter; In order to eliminate dc capacitor voltage secondary ripple, dc capacitor voltage secondary ripple command value Ref value is 0;
4) by voltage Vpcc_a, voltage Vpcc_b, voltage Vpcc_c, load current I
Load_A, load current I
Load_BWith load current I
Load_C, calculate the secondary pulsating power P that multiplexing functions type interface current transformer need to absorb
2, wherein used formula is:
5) with the moving rate P of secondary pulsation
2As after the output valve addition of feedforward value and described secondary ripple adjuster through calculating the triple harmonic current value I of expectation
3abc_ref
6) with triple harmonic current value I
3abc_refBe command value, with the current value I at inverter output filter 30 places
Lf_A, current value I
Lf_BAnd current value I
Lf_CBe value of feedback, calculate inverter output voltage value V by the output current controller
Inv_
RefWherein, the output current controller can use the conventional current controllers such as repetitive controller or resonant controller;
7) with described inverter output voltage value V
Inv_
RefBe modulation signal, carry out SPWM or SVPWM pulse-width modulation, and drive the IGBT pipe S of multiplexing functions type interface current transformer 20 with modulation result
1, IGBT manages S
2, IGBT manages S
3, IGBT manages S
4, IGBT manages S
5With IGBT pipe S
6
8) triple harmonic current of multiplexing functions type interface current transformer 20 generations will be absorbed by passive triple frequency harmonic filter 40.
The invention has the beneficial effects as follows: simple in structure a, stable performance is provided, has been convenient to inhibitor and inhibition method that networking is used, secondary pulsation that can establishment composite DC side voltage of converter.The present invention with the form release of AC triple harmonic current, thereby suppresses the generation that the dc capacitor voltage secondary is pulsed with the secondary pulsating power; Simultaneously, with one group of passive triple frequency harmonic filter the triple harmonic current that current transformer produces is absorbed, finally solve the secondary pulsation problem in the composite DC side voltage of converter.
Description of drawings
Fig. 1 is the circuit structure diagram of inhibitor of the present invention.
Fig. 2 is for adopting the principle schematic of inhibition method of the present invention.
Fig. 3 is for adopting the inhibition method flow block diagram of inhibitor of the present invention.
Fig. 4 is for using the DC side secondary ripple voltage comparison of wave shape figure of present device and method front and back.
Embodiment
Now be described with reference to the accompanying drawings content of the present invention.
Referring to Fig. 1, the inhibitor of the secondary pulsation of composite DC side voltage of converter of the present invention, comprise DC side unit 10, multiplexing functions type interface converter cell 20 and inverter output filter unit 30, wherein, DC side unit 10 is comprised of a capacitor C _ DC, multiplexing functions type interface converter cell 20 is comprised of six IGBT pipes and six anti-paralleled diodes, i.e. IGBT pipe S
1, the 2nd IGBT manages S
2, the 3rd IGBT manages S
3, the 4th IGBT manages S
4, the 5th IGBT manages S
5, the 6th IGBT manages S
6, the first diode D
1, the second diode D
2, the 3rd diode D
3, the 4th diode D
4, the 5th diode D
5With the 6th diode D
6Inverter output filter unit 30 is by inductance L
f_ A, inductance L
f_ B and inductance L
f_ C forms; One side of inverter output filter unit 30 is connected with DC side unit 10 through multiplexing functions type interface converter cell 20, and wherein, the opposite side of inverter output filter unit 30 is provided with passive triple frequency harmonic filter unit 40; Described passive triple frequency harmonic filter unit 40 is comprised of inductance L _ A, inductance L _ B, inductance L _ C, capacitor C 1, capacitor C 2 and capacitor C 3, and wherein the end of inductance L _ A, inductance L _ B and inductance L _ C links together; The other end of inductance L _ A is connected with capacitor C 1, the other end of capacitor C 1 and inductance L
f_ A is connected; The other end of inductance L _ B is connected with capacitor C 2, the other end of capacitor C 2 and inductance L
f_ B is connected; The other end of inductance L _ C is connected with capacitor C 3, the other end of capacitor C 3 and inductance L
f_ C is connected; During use with capacitor C 1 and inductance L
fNode between the _ A, capacitor C 2 and inductance L
fNode between the _ B, capacitor C 3 and inductance L
fNode between the _ C all is connected with PCC.
Referring to Fig. 2, DC side secondary voltage pulsation inhibition method basic principle of the present invention is: the form that multiplexing functions type interface current transformer 20 absorbs current transformer because of the compensation negative-sequence current secondary power pulsation is converted into the AC triple harmonic current discharges, avoid pulsating power to enter DC side, thereby suppress the dc voltage pulsation.Consequent AC triple harmonic current then adopts one group of passive triple frequency harmonic filter 40 filtering.
Referring to Fig. 3, the inhibition method of the secondary of composite DC side voltage of converter of the present invention pulsation is to adopt inhibitor of the present invention, carries out as follows:
1) on three phase network to be measured and the cable between the unbalanced load, gets place's points of common connection (Point of Common Coupling, PCC), with sample tap A, the sample tap B of multiplexing functions type interface current transformer and three nodes at sample tap C and PCC place, be node A, Node B and node C, connect one by one; The voltage Vpcc_a, the load current I that obtain respectively at the PCC place
Load_A, voltage Vpcc_b, load current I
Load_B, voltage Vpcc_c and load current I
Load_CMeasure the magnitude of voltage V at dc bus capacitor C_DC two ends
C_DC Inverter output filter 30 inductance L are flow through in measurement
fThe current value I at _ A place
Lf_A, inductance L
fThe current value I at _ B place
Lf_BAnd inductance L
fThe current value I at _ C place
Lf_C
2) by dc capacitor voltage value V
C_DCUse the second harmonic filter to calculate the secondary voltage ripple value of feedback V of dc capacitor voltage
Ripple, wherein use second harmonic filter computing formula to be:
3) with dc capacitor voltage secondary ripple command value Ref and secondary voltage ripple value of feedback V
RippleIt is poor to do, and obtains the secondary voltage ripple error value e of dc capacitor voltage
RippleAnd should be worth input secondary ripple adjuster, and wherein, the value of dc capacitor voltage secondary ripple command value Ref is 0, secondary ripple adjuster transfer function is:
Wherein:
,
Be the prescription dosage regulating device parameter;
4) by voltage Vpcc_a, voltage Vpcc_b, voltage Vpcc_c, load current I
Load_A, load current I
Load_BWith load current I
Load_C, calculate the secondary pulsating power P that multiplexing functions type interface current transformer need to absorb
2, wherein:
5) with the moving rate P of secondary pulsation
2As the output valve addition of feedforward value and described secondary ripple adjuster by the triple harmonic current value I that calculates expectation
3abc_ref
6) with triple harmonic current value I
3abc_refBe command value, with the current value I at inverter output filter 30 places
Lf_A, current value I
Lf_BAnd current value I
Lf_CBe value of feedback, calculate inverter output voltage value V by the output current controller
Inv_
RefWherein, the output current controller can use the conventional current controllers such as repetitive controller or resonant controller;
7) with described inverter output voltage value V
Inv_
RefBe modulation signal, carry out the PWM pulse-width modulation, and drive the IGBT pipe S of multiplexing functions type interface current transformer 20 with the switching signal that modulation draws
1, IGBT manages S
2, IGBT manages S
3, IGBT manages S
4, IGBT manages S
5With IGBT pipe S
6
8) triple harmonic current of multiplexing functions type interface current transformer 20 generations will be absorbed by passive triple frequency harmonic filter 40.
Referring to Fig. 4, the E section is not use the DC side voltage of converter waveform of this inhibitor and inhibition method, and the F section is the DC side voltage of converter waveform after this inhibitor of use and the inhibition method.Under identical loading condition, after use the present invention put forward apparatus and method, DC side secondary ripple amplitude was reduced to 1.5V by original 7V, has on average reduced by 4.5 times, has suppressed significantly DC side secondary ripple voltage.
Claims (2)
1. the inhibitor of the secondary of composite DC side voltage of converter pulsation, comprise DC side unit (10), multiplexing functions type interface converter cell (20) and inverter output filter unit (30), wherein, DC side unit (10) is comprised of a capacitor C _ DC, multiplexing functions type interface converter cell (20) is comprised of six IGBT pipes and six anti-paralleled diodes, i.e. IGBT pipe S
1, the 2nd IGBT manages S
2, the 3rd IGBT manages S
3, the 4th IGBT manages S
4, the 5th IGBT manages S
5, the 6th IGBT manages S
6, the first diode D
1, the second diode D
2, the 3rd diode D
3, the 4th diode D
4, the 5th diode D
5With the 6th diode D
6Inverter output filter unit (30) is by inductance L
f_ A, inductance L
f_ B and inductance L
f_ C forms; One side of inverter output filter unit (30) is connected with DC side unit (10) through multiplexing functions type interface converter cell (20), it is characterized in that the opposite side of inverter output filter unit (30) is provided with passive triple frequency harmonic filter unit (40); Described passive triple frequency harmonic filter unit (40) is comprised of inductance L _ A, inductance L _ B, inductance L _ C, capacitor C 1, capacitor C 2 and capacitor C 3, and wherein the end of inductance L _ A, inductance L _ B and inductance L _ C links together; The other end of inductance L _ A is connected with capacitor C 1, the other end of capacitor C 1 and inductance L
f_ B is connected; The other end of inductance L 2 is connected with capacitor C 2, the other end of capacitor C 2 and inductance L
f_ B is connected; The other end of inductance L _ C is connected with capacitor C 3, the other end of capacitor C 3 and inductance L
f_ C is connected.
2. adopt the as claimed in claim 1 secondary pulsation inhibition method of the multiplexing functions type DC side voltage of converter of inhibitor, it is characterized in that, carry out as follows:
1) get place's points of common connection on three phase network to be measured and the cable between the unbalanced load, with sample tap A, the sample tap B of multiplexing functions combining inverter and three nodes at sample tap C and PCC place, namely node A, Node B and node C connect one by one; The voltage Vpcc_a, the load current I that obtain respectively at the PCC place
Load_A, voltage Vpcc_b, load current I
Load_B, voltage Vpcc_c and load current I
Load_CMeasure the magnitude of voltage V at dc bus capacitor C_DC two ends
C_DCInverter output filter (30) inductance L is flow through in measurement
fThe current value I at _ A place
Lf_A, inductance L
fThe current value I at _ B place
Lf_BAnd inductance L
fThe current value I at _ C place
Lf_C
2) according to the dc capacitor voltage value V that measures
C_DC,Calculate the secondary voltage ripple value of feedback V of dc capacitor voltage by the second harmonic filter
Ripple
3) with dc capacitor voltage secondary ripple command value Ref and secondary voltage ripple value of feedback V
RippleIt is poor to do, and obtains the secondary voltage ripple error value e of dc capacitor voltage
RippleAnd input secondary ripple adjuster;
4) by voltage Vpcc_a, voltage Vpcc_b, voltage Vpcc_c, load current I
Load_A, load current I
Load_BWith load current I
Load_C, calculate the secondary pulsating power P that multiplexing functions type interface current transformer need to absorb
2
5) with the moving rate P of secondary pulsation
2As after the output valve addition of feedforward value and described secondary ripple adjuster through calculating the triple harmonic current value I of expectation
3abc_ref
6) with triple harmonic current value I
3abc_refBe command value, the current value I of locating with inverter output filter (30)
Lf_A, current value I
Lf_BAnd current value I
Lf_CBe value of feedback, calculate inverter output voltage value V by the output current controller
Inv_
RefWherein, the output current controller can use the conventional current controllers such as repetitive controller or resonant controller;
7) with described inverter output voltage value V
Inv_
RefBe modulation signal, carry out SPWM or SVPWM pulse-width modulation, and drive the IGBT pipe S of multiplexing functions type interface current transformer (20) with modulation result
1, IGBT manages S
2, IGBT manages S
3, IGBT manages S
4, IGBT manages S
5With IGBT pipe S
6
8) triple harmonic current of multiplexing functions type interface current transformer (20) generation will be absorbed by passive triple frequency harmonic filter (40).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559363.XA CN102983729B (en) | 2012-12-21 | 2012-12-21 | Suppressor and suppression method for secondary pulse of DC side voltage of multiplexing inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210559363.XA CN102983729B (en) | 2012-12-21 | 2012-12-21 | Suppressor and suppression method for secondary pulse of DC side voltage of multiplexing inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102983729A true CN102983729A (en) | 2013-03-20 |
| CN102983729B CN102983729B (en) | 2015-06-10 |
Family
ID=47857528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210559363.XA Expired - Fee Related CN102983729B (en) | 2012-12-21 | 2012-12-21 | Suppressor and suppression method for secondary pulse of DC side voltage of multiplexing inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102983729B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993473A (en) * | 2015-05-28 | 2015-10-21 | 广西大学 | Three-phase electricity-saving compensation controller |
| CN108199409A (en) * | 2018-01-09 | 2018-06-22 | 西南交通大学 | A kind of pulsation of current suppressing method of fuel cell generation |
| CN113114033A (en) * | 2021-05-18 | 2021-07-13 | 西南交通大学 | Direct-current-side secondary ripple suppression device for traction transmission system and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841876A (en) * | 2005-12-18 | 2006-10-04 | 江苏省电力公司无锡供电公司 | Mixed THF based on symmetrical component method |
| CN101159379A (en) * | 2007-04-30 | 2008-04-09 | 湖南大学 | Mixed active electric power filter and direct current side voltage control method thereof |
| CN101789600A (en) * | 2010-01-25 | 2010-07-28 | 苏州华辰电气有限公司 | Method for controlling dynamic direct voltage of parallel connection type active electric filter |
| CN202384762U (en) * | 2011-08-03 | 2012-08-15 | 广西电网公司电力科学研究院 | 35kV shunt hybrid electrical network harmonic wave active filtering integrated device |
-
2012
- 2012-12-21 CN CN201210559363.XA patent/CN102983729B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841876A (en) * | 2005-12-18 | 2006-10-04 | 江苏省电力公司无锡供电公司 | Mixed THF based on symmetrical component method |
| CN101159379A (en) * | 2007-04-30 | 2008-04-09 | 湖南大学 | Mixed active electric power filter and direct current side voltage control method thereof |
| CN101789600A (en) * | 2010-01-25 | 2010-07-28 | 苏州华辰电气有限公司 | Method for controlling dynamic direct voltage of parallel connection type active electric filter |
| CN202384762U (en) * | 2011-08-03 | 2012-08-15 | 广西电网公司电力科学研究院 | 35kV shunt hybrid electrical network harmonic wave active filtering integrated device |
Non-Patent Citations (1)
| Title |
|---|
| 李红波等.: ""高功率密度单相变换器的直流有源滤波器研究"", 《中国电机工程学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993473A (en) * | 2015-05-28 | 2015-10-21 | 广西大学 | Three-phase electricity-saving compensation controller |
| CN108199409A (en) * | 2018-01-09 | 2018-06-22 | 西南交通大学 | A kind of pulsation of current suppressing method of fuel cell generation |
| CN108199409B (en) * | 2018-01-09 | 2024-02-27 | 西南交通大学 | Current pulsation suppression method for fuel cell power generation system |
| CN113114033A (en) * | 2021-05-18 | 2021-07-13 | 西南交通大学 | Direct-current-side secondary ripple suppression device for traction transmission system and control method |
| CN113114033B (en) * | 2021-05-18 | 2022-11-29 | 西南交通大学 | Direct-current-side secondary ripple suppression device for traction transmission system and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102983729B (en) | 2015-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101697418B (en) | Photovoltaic inversion grid-connection and harmonic suppression hybrid system for micro grid and composite control method thereof | |
| CN101877548B (en) | For three-phase four-leg inverter and the grid-connected photovoltaic system of parallel network power generation | |
| CN105322770B (en) | The secondary ripple wave electric current suppressing method of direct-current grid bidirectional energy-storage converter | |
| CN106655805A (en) | MMC-based multi-port hybrid power electronic transformer and control method thereof | |
| CN102916435B (en) | A kind of battery energy storage power conversion system containing Z source network and control method thereof | |
| CN104269882A (en) | Energy feedback unit and energy feedback method | |
| CN103915856A (en) | Base station grid connected-charging photovoltaic micro-inverter system and control method thereof | |
| CN106411161A (en) | Three-phase PWM converter in voltage unbalance condition and optimal control method of three-phase PWM converter | |
| CN102570488B (en) | Power conversion system based on energy storage of lithium battery and control method thereof | |
| CN205389177U (en) | Novel many level of modularization type solid -state transformer | |
| CN102983729B (en) | Suppressor and suppression method for secondary pulse of DC side voltage of multiplexing inverter | |
| CN203607860U (en) | Bidirectional energy storage current transformer main power circuit | |
| CN105958808A (en) | Control method of photovoltaic grid-connected inverter | |
| CN103618328B (en) | A kind of power conversion system of mobile energy storage | |
| CN104882889A (en) | Composite circuit integrating rectification, active power filtering and energy feedback braking functions | |
| CN104300820B (en) | A kind of digital control method of two-stage type three-phase tri-level photovoltaic combining inverter | |
| CN103475209A (en) | Non-electrolytic-capacitor high-power-factor correction device and method | |
| CN206575376U (en) | A kind of miniature photovoltaic grid-connected inverter | |
| CN105490297A (en) | Microgrid supply voltage and grid current harmonics synchronous compensation method based on dual inverter group coordinated control | |
| CN209929980U (en) | Novel series voltage regulator without transformer | |
| CN205141694U (en) | Circuit is administered to alternate disequilibrium of three -phase grid | |
| CN204720986U (en) | The compound circuit of a kind of integrated rectification, active power filtering and energy back braking function | |
| CN109256764A (en) | A kind of vehicle-mounted grid-side converter suitable for middle pressure direct-current traction power supply | |
| CN205377291U (en) | Parallel -connected hybrid active power filter | |
| CN107147118A (en) | A kind of harmonic controling device administered applied to electrified railway electric energy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20201221 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |