CN102761138A - LCL type grid-connected inverter without resonance damping and integrated design method thereof - Google Patents
LCL type grid-connected inverter without resonance damping and integrated design method thereof Download PDFInfo
- Publication number
- CN102761138A CN102761138A CN2012102673312A CN201210267331A CN102761138A CN 102761138 A CN102761138 A CN 102761138A CN 2012102673312 A CN2012102673312 A CN 2012102673312A CN 201210267331 A CN201210267331 A CN 201210267331A CN 102761138 A CN102761138 A CN 102761138A
- Authority
- CN
- China
- Prior art keywords
- inverter
- lcl
- current
- grid
- type combining
- 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.)
- Pending
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The invention provides an LCL type grid-connected inverter without resonance damping. The grid-connected inverter comprises an inverter, an LCL filter, a current sensor, a voltage sensor, a current control loop and a switch driving circuit, wherein the LCL filter is used for grid-connected operation of the inverter; the current sensor is used for grid-connected current detection; the voltage sensor is used for grid-connected voltage detection; the current control loop is used for grid-connected operation of the inverter; the inverter is directly connected with the LCL filter and the switch driving circuit; and the current control loop is used for generating a modulation signal, which is required by an inverse switch in operation, and then providing the modulation signal to the switch driving circuit. The invention further provides an integrated design method of the LCL type grid-connected inverter without resonance damping. According to the invention, control performances of an L type grid-connected inverter and the attenuation property of the LCL filter to a high frequency current ripple are effectively synthesized; and the LCL type grid-connected inverter without resonance damping, provided by the invention, has the advantages of simple design process, low cost and easiness for engineering promotion.
Description
Technical field
The present invention relates to the combining inverter technical field, particularly a kind of LCL type combining inverter and integrated design method thereof that need not the resonance damping.
Background technology
Inverter with the operation function that generates electricity by way of merging two or more grid systems of the prior art, inverter are output current control when being incorporated into the power networks, and are the sinusoidal wave of strictness and have higher generated output factor to guarantee electric current.Common independent design filter of conventional inverter method for designing and controller; Because filter does not take into full account the challenge of its resonance peak to the stability of control system in design process; Thereby need to adopt passive damping or active damping technology to guarantee that control system is stable; The former will reduce filtration efficiency, and introduce power loss; The latter has increased control complexity or cost, and control performance (instruction trace, grid disturbance suppress and the electrical network internal resistance changed aspect such as robustness) is significantly smaller than L type combining inverter.
Summary of the invention
Based on the above problem that exists; The present invention provides a kind of LCL type combining inverter and integrated design method thereof that need not the resonance damping; Combine control performance and the LCL filter of L type combining inverter fade performance effectively to the high-frequency current ripple; Design cycle is simple, and cost is low, is easy to engineering and promotes.
Main solution of the present invention is achieved in that
On the one hand; The present invention provides a kind of LCL type combining inverter that need not the resonance damping; It comprises: inverter, be used for inverter be incorporated into the power networks the LCL filter that connects operation, be used for current sensor that grid-connected current detects, the voltage sensor of the voltage detecting that is used to be incorporated into the power networks, be used for current regulator and switch driving circuit that inverter is incorporated into the power networks; Said inverter directly links to each other with said LCL filter, said switch driving circuit, and said current regulator offers said switch driving circuit after producing the required modulation signal of inverse switch operation.
Preferably, said inverter is based on the single-phase or three-phase inverter of the pulse width modulation control of HF switch.
On the other hand; The present invention also provides a kind of integrated design method that need not the LCL type combining inverter of resonance damping; The said LCL type combining inverter that need not the resonance damping comprises inverter, be used for inverter be incorporated into the power networks the LCL filter that connects operation, be used for current sensor that grid-connected current detects, the voltage sensor of the voltage detecting that is used to be incorporated into the power networks, be used for current regulator and switch driving circuit that inverter is incorporated into the power networks; Said inverter directly links to each other with said LCL filter, said switch driving circuit; Said current regulator offers said switch driving circuit after producing the required modulation signal of inverse switch operation; The said integrated design method that need not the LCL type combining inverter of resonance damping comprises step: a. selects suitable applications in the current PI controller of L type combining inverter, introduces the ratio feedforward of line voltage unit at the output of PI controller simultaneously; B. the current PI controller according to step a defines suitable LCL filter resonance frequency scope, makes control system reach the stability margin of expectation; C. in the scope of the LCL filter resonance frequency that step b is defined, select suitable resonance frequency; Select the most significantly desired value and the inductance bundle factor of harmonic content of suitable grid-connected current again, finally obtain each wattless component parameter of LCL filter at carrier wave band and sideband.
Preferably, said inverter is based on the single-phase or three-phase inverter of the pulse width modulation control of HF switch.
The present invention combines control performance and the LCL filter of the L type combining inverter fade performance to the high-frequency current ripple effectively, and design cycle is simple, and cost is low, is easy to engineering and promotes.
Description of drawings
Fig. 1 is the circuit structure and the control structure sketch map thereof of the LCL type combining inverter that need not the resonance damping of the specific embodiment of the invention;
Fig. 2 is the step response diagram of parallel network reverse control system of the LCL type combining inverter that need not the resonance damping of the specific embodiment of the invention;
Fig. 3 is that the LCL type combining inverter that need not the resonance damping of the specific embodiment of the invention can be tried hard to the inhibition of electrical network background harmonics;
Fig. 4 is the open-loop frequency response figure of LCL type combining inverter under electrical network internal resistance situation of change that need not the resonance damping of the specific embodiment of the invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention, it will be more clear making above-mentioned and other purpose, characteristic and advantage of the present invention.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly do not draw accompanying drawing in proportion, focus on illustrating purport of the present invention.
Below in conjunction with Fig. 1 to Fig. 4 the LCL type combining inverter that need not the resonance damping of specific embodiment of the present invention and the specific embodiment of integrated design method thereof are elaborated.Fig. 1 is the circuit structure and the control structure sketch map thereof of the LCL type combining inverter that need not the resonance damping of the specific embodiment of the invention; Fig. 2 is the step response diagram of parallel network reverse control system of the LCL type combining inverter that need not the resonance damping of the specific embodiment of the invention; Fig. 3 is that the LCL type combining inverter that need not the resonance damping of the specific embodiment of the invention can be tried hard to the inhibition of electrical network background harmonics, and Fig. 4 is the open-loop frequency response figure of LCL type combining inverter under electrical network internal resistance situation of change that need not the resonance damping of the specific embodiment of the invention.
The LCL type combining inverter that need not the resonance damping of the embodiment of the invention; It comprises: inverter 1, be used for inverter be incorporated into the power networks the LCL filter 2 that connects operation, be used for current sensor 3 that grid-connected current detects, the voltage sensor 4 of the voltage detecting that is used to be incorporated into the power networks, be used for current regulator 5 and switch driving circuit 6 that inverter is incorporated into the power networks; Inverter 1 directly links to each other with LCL filter 2, switch driving circuit 6, and current regulator 5 offers switch driving circuit 6 after producing the required modulation signal of inverse switch operation.
In the specific embodiment of the invention, inverter 1 is based on the single-phase or three-phase inverter of the pulse width modulation control of HF switch.
On the other hand; The present invention also provides a kind of aforesaid integrated design method that need not the LCL type combining inverter of resonance damping; This integrated design method that need not the LCL type combining inverter of resonance damping comprises step: a. selects suitable applications in the current PI controller (Proportional Integral Controller) of L type combining inverter, introduces the ratio feedforward of line voltage unit at the output of PI controller simultaneously; B. the current PI controller according to step a defines suitable LCL filter resonance frequency scope, makes control system reach the stability margin of expectation; C. in the scope of the LCL filter resonance frequency that step b is defined, select suitable resonance frequency; Select the most significantly desired value and the inductance bundle factor of harmonic content of suitable grid-connected current again, finally obtain each wattless component parameter of LCL filter at carrier wave band and sideband.
Particularly, the integrated design method step of the LCL type combining inverter that need not the resonance damping of the specific embodiment of the invention is introduced as follows in detail:
(1) the current PI controller of selecting suitable rule to adjust and be applied to single inductive type combining inverter, its expression formula is:
Be without loss of generality; In the specific embodiment of the invention, the rule of choosing of the each several part parameter of formula
is [1]:
Wherein,
is the total inductance amount of LCL filter, will obtain in step (3).The PI controller of gained can make L type combining inverter coordinate dynamic property and steady-state behaviour preferably, and corresponding dynamic characteristic is stronger to the robustness that stability margin changes, and is applied to LCL type combining inverter thereby be fit to expand.In addition, the component after the ratio feedforward of line voltage unit is superimposed to the PI controller output end.
(2) choose the resonant frequency range of suitable LCL filter, the lower limit of resonance frequency
can obtain through finding the solution following equation:
Wherein,
and
is respectively the stability margin of reading according to the open-loop frequency response characteristic of L type combining inverter (unit: the dB) frequency (unit: rad/s) corresponding with
phase place;
is the stability margin of the LCL type combining inverter of expectation; Its value must be less than
; Be without loss of generality desirable
.The upper limit of resonance frequency
can obtain through finding the solution following equation group:
Wherein,
is the phase margin of the LCL type combining inverter of expectation.Be without loss of generality desirable
.Resonant frequency range by said process can get is finally represented by formula
;
Wherein,
is the resonance frequency of LCL filter, and T is the sampling period.
(3) each idle parameter of further clear and definite filter.Its flow process is:
(3.1) selective resonance frequency in the scope that step (2) is confirmed.For reducing total filtered electrical sensibility reciprocal as much as possible, recommend resonance frequency to get the lower limit of the scope that step (2) defined;
(3.2) in grid-connected current high order harmonic component standard, (be no more than 0.3%) and choose the target harmonic content (
) of grid-connected current, as 0.25% at the switching frequency place;
(3.3) choose inductance bundle factor (
); As the compromise between filter iron loss and the capacitive reactive power; Consider robustness simultaneously, as get 0.3 the electrical network internal resistance;
(3.4) according to the final wattless component parameter of above parameter acquiring.Its flow process is:
(3.4.1) ask for the inverter side inductance value according to formula III:
Wherein,
is grid-connected current carrier wave band and the corresponding inverter voltage amplitude of the most significant harmonic component of sideband;
is that (unit: rad/s),
is specified grid-connected current effective value to corresponding frequency.(3.4.2) ask for net side inductance value according to formula
:
(3.4.3) ask for the filter capacitor value according to formula
:
According to above design procedure, table 1 has provided the design example of the single-phase LCL type combining inverter of 2.5kW.In the table 1, inverter adopts the modulation of one pole frequency multiplication, switching frequency 10kHz, sample frequency 20kHz.
In the table I; Be DC bus-bar voltage;
is the specified voltage that is incorporated into the power networks (effective value);
accounts for the ratio of specified first-harmonic peak value for the maximum of current ripples that flows through inversion side inductance, and pu represents the perunit value of wattless component.
The present invention compared with prior art has following advantage on the control performance:
(1) need not the resonance damping, make that the clear and definite PI controller of parameter design rule is able in LCL type combining inverter, directly use, thereby reduced the controller debugging difficulty, and saved the required extra transducer of general active damping method.
(2) dynamic response quick and smooth; Fig. 2 is the step response diagram of parallel network reverse control system of the LCL type combining inverter that need not the resonance damping of the specific embodiment of the invention, and wherein curve 1 and curve 2 are respectively the characteristic of LCL type and L type combining inverter.Can know, with the controller of L type inverter expand be applied to LCL type inverter after, its bandwidth is approximate constant, and overshoot is still within tolerance interval.Have benefited from proportional action stronger in the PI controller and less relatively integral action, actual device will show the more dynamic response of quick and smooth.
(3) inhibition grid disturbance ability is strong; Fig. 3 is that the LCL type combining inverter that need not the resonance damping of the specific embodiment of the invention can be tried hard to the inhibition of electrical network background harmonics, and it is high more to gain, and the inhibition ability is strong more.Curve 1 representative had not both had electrical network feedforward, the situation when yet not having the electrical network internal resistance; Curve 2 representative has the ratio feedforward of electrical network unit, the situation during no electrical network internal resistance; Curve 3 representative has the ratio feedforward of electrical network unit, the situation when the electrical network internal resistance is 3 times a net side inductance.It is thus clear that the ratio feedforward of electrical network unit has strengthened the anti-grid disturbance ability of inverter greatly, and bigger electrical network internal resistance has only slightly reduced output impedance.
(4) strong robustness that the electrical network internal resistance is changed; Fig. 4 is the open-loop frequency response figure of LCL type combining inverter under electrical network internal resistance situation of change that need not the resonance damping of the specific embodiment of the invention, and curve 1 representative is at the open loop characteristic of (Lg=0) off the net by force; Curve 2 representatives are not adopted the open loop characteristic of voltage feed-forward control at weak (Lg=3L2) off the net; Curve 3 representatives are adopted the open loop characteristic of line voltage unit's ratio feedforward at weak (Lg=3L2) off the net.It is thus clear that weak off the net, the ratio feedforward of line voltage unit has not only kept sufficient stability margin, has also kept suitable open-loop gain.
The present invention adopts and at first sets the PI controller that is applied to L type combining inverter; Thereby design the combining inverter integrated design method of corresponding filter cancellation resonance damping again; Realized the high performance control of combining inverter output current, comprised very strong follow-up control, the inhibition ability of electrical network background harmonics and robustness that the electrical network internal resistance is changed to current-order.In addition, be incorporated into the power networks harmonic standard and engineering restrictive condition have also been satisfied simultaneously.Test shows that in the power-supply system of 2.5 kW power, the line voltage distortion factor surpasses under 5% service conditions, and the distortion factor of the output current that is incorporated into the power networks is less than 3%, and power factor is greater than 0.99, and the internal resistance of tolerable electrical network is not less than 5 mH.The present invention is applicable to that with semiconductor device such as MOSFET, IGBT be power switch, adopts the three-phase or the single-phase grid-connected operation inverter of various forms PWM control, is used for the various power-supply systems that are incorporated into the power networks such as solar energy, wind-force, fuel cell power generation.
Key of the present invention is at first to select a kind of PI current controller of the L of being applied to type combining inverter, and the LCL filter of controller and filtering requirements is satisfied in design then, has strengthened the stability of system simultaneously through applying unit ratio voltage feed-forward control.Concrete implementation can have multiple, so the present invention is not limited to above-mentioned concrete implementation, and every employing mentality of designing of the present invention and design cycle are done the design of simple change or change slightly, all fall into protection range of the present invention.
The fade performance that need not the LCL type combining inverter of resonance damping and control performance that integrated design method combines L type combining inverter effectively and LCL filter thereof to the high-frequency current ripple of the present invention; Design cycle is simple; Cost is low, is easy to engineering and promotes, and combine L type combining inverter in advantage on the control performance and the advantage of LCL filter on filtering performance; Simultaneously simplicity of design, cost are low, thereby can in new forms of energy and distributed power generation, be used on a large scale.
In above description, a lot of details have been set forth so that make much of the present invention.But above description only is preferred embodiment of the present invention, and the present invention can implement much to be different from alternate manner described here, so the present invention does not receive the restriction of top disclosed practical implementation.Any skilled personnel are not breaking away under the technical scheme scope situation of the present invention simultaneously; All the method for above-mentioned announcement capable of using and technology contents are made many possible changes and modification to technical scheme of the present invention, or are revised as the equivalent embodiment of equivalent variations.Every content that does not break away from technical scheme of the present invention to any simple modification, equivalent variations and modification that above embodiment did, all still belongs to technology of the present invention according to technical spirit of the present invention.
Claims (4)
1. LCL type combining inverter that need not the resonance damping; It is characterized in that; Comprise: inverter, be used for inverter be incorporated into the power networks the LCL filter that connects operation, be used for current sensor that grid-connected current detects, the voltage sensor of the voltage detecting that is used to be incorporated into the power networks, be used for current regulator and switch driving circuit that inverter is incorporated into the power networks; Said inverter directly links to each other with said LCL filter, said switch driving circuit, and said current regulator offers said switch driving circuit after producing the required modulation signal of inverse switch operation.
2. the LCL type combining inverter that need not the resonance damping according to claim 1 is characterized in that, said inverter is based on the single-phase or three-phase inverter of the pulse width modulation control of HF switch.
3. integrated design method that need not the LCL type combining inverter of resonance damping; It is characterized in that; The said LCL type combining inverter that need not the resonance damping comprises inverter, be used for inverter be incorporated into the power networks the LCL filter that connects operation, be used for current sensor that grid-connected current detects, the voltage sensor of the voltage detecting that is used to be incorporated into the power networks, be used for current regulator and switch driving circuit that inverter is incorporated into the power networks; Said inverter directly links to each other with said LCL filter, said switch driving circuit; Said current regulator offers said switch driving circuit after producing the required modulation signal of inverse switch operation, and the said integrated design method that need not the LCL type combining inverter of resonance damping comprises step:
A. select the current PI controller of suitable applications, introduce the ratio feedforward of line voltage unit at the output of PI controller simultaneously in L type combining inverter;
B. the current PI controller according to step a defines suitable LCL filter resonance frequency scope, makes control system reach the stability margin of expectation;
C. in the scope of the LCL filter resonance frequency that step b is defined, select suitable resonance frequency; Select the most significantly desired value and the inductance bundle factor of harmonic content of suitable grid-connected current again, finally obtain each wattless component parameter of LCL filter at carrier wave band and sideband.
4. the integrated design method that need not the LCL type combining inverter of resonance damping according to claim 3 is characterized in that, said inverter is based on the single-phase or three-phase inverter of the pulse width modulation control of HF switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102673312A CN102761138A (en) | 2012-07-31 | 2012-07-31 | LCL type grid-connected inverter without resonance damping and integrated design method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102673312A CN102761138A (en) | 2012-07-31 | 2012-07-31 | LCL type grid-connected inverter without resonance damping and integrated design method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102761138A true CN102761138A (en) | 2012-10-31 |
Family
ID=47055494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102673312A Pending CN102761138A (en) | 2012-07-31 | 2012-07-31 | LCL type grid-connected inverter without resonance damping and integrated design method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102761138A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050975A (en) * | 2012-12-04 | 2013-04-17 | 国网智能电网研究院 | Parameter design method for high-voltage high-capacity VSC (voltage source converter) |
| CN103227469A (en) * | 2012-11-28 | 2013-07-31 | 东方日立(成都)电控设备有限公司 | Secondary ripple wave suppression method for bus voltage of photovoltaic grid-connected inverter |
| CN103354359A (en) * | 2013-08-02 | 2013-10-16 | 南京航空航天大学 | Phase angle margin compensation-based system impedance active control method of grid -connected inverter |
| CN103475029A (en) * | 2013-09-27 | 2013-12-25 | 重庆大学 | Three-phase LCL type grid-connected inverter control system and method based on pole assignment |
| CN103545838A (en) * | 2013-09-17 | 2014-01-29 | 南京航空航天大学 | Method for adaptively controlling hybrid damping of grid-connection inverter applicable to weak grid access conditions |
| CN104600703A (en) * | 2015-02-05 | 2015-05-06 | 重庆大学 | Grid-connected inverter harmonic resonance suppression method based on phase margin compensation |
| CN105322784A (en) * | 2014-07-11 | 2016-02-10 | 英飞凌科技奥地利有限公司 | Method and apparatus for controller optimization of switching voltage regulator |
| CN111435141A (en) * | 2019-01-15 | 2020-07-21 | 中国电力科学研究院有限公司 | Power grid impedance measuring device and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097824A (en) * | 2010-12-31 | 2011-06-15 | 华中科技大学 | Control method of LCL (Lower Control Limit) type grid-connected inverter for restricting influence of grid voltage on grid-connected current |
-
2012
- 2012-07-31 CN CN2012102673312A patent/CN102761138A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097824A (en) * | 2010-12-31 | 2011-06-15 | 华中科技大学 | Control method of LCL (Lower Control Limit) type grid-connected inverter for restricting influence of grid voltage on grid-connected current |
Non-Patent Citations (1)
| Title |
|---|
| 薛明雨: "《LCL型并网逆变器的解耦控制与优化设计》", 《华中科技大学博士论文》, 1 May 2012 (2012-05-01), pages 4 * |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103227469A (en) * | 2012-11-28 | 2013-07-31 | 东方日立(成都)电控设备有限公司 | Secondary ripple wave suppression method for bus voltage of photovoltaic grid-connected inverter |
| CN103227469B (en) * | 2012-11-28 | 2015-09-02 | 东方日立(成都)电控设备有限公司 | A kind of suppressing method of photovoltaic combining inverter busbar voltage secondary ripple wave |
| CN103050975A (en) * | 2012-12-04 | 2013-04-17 | 国网智能电网研究院 | Parameter design method for high-voltage high-capacity VSC (voltage source converter) |
| CN103050975B (en) * | 2012-12-04 | 2015-06-24 | 国网智能电网研究院 | Parameter design method for high-voltage high-capacity VSC (voltage source converter) |
| CN103354359A (en) * | 2013-08-02 | 2013-10-16 | 南京航空航天大学 | Phase angle margin compensation-based system impedance active control method of grid -connected inverter |
| CN103354359B (en) * | 2013-08-02 | 2016-04-20 | 南京航空航天大学 | A kind of grid-connected inverter system impedance Active Control Method compensated based on Phase margin |
| CN103545838B (en) * | 2013-09-17 | 2015-11-25 | 南京航空航天大学 | A kind of combining inverter mixing damping adaptive control method be applicable under light current net access conditions |
| CN103545838A (en) * | 2013-09-17 | 2014-01-29 | 南京航空航天大学 | Method for adaptively controlling hybrid damping of grid-connection inverter applicable to weak grid access conditions |
| CN103475029A (en) * | 2013-09-27 | 2013-12-25 | 重庆大学 | Three-phase LCL type grid-connected inverter control system and method based on pole assignment |
| CN105322784A (en) * | 2014-07-11 | 2016-02-10 | 英飞凌科技奥地利有限公司 | Method and apparatus for controller optimization of switching voltage regulator |
| CN105322784B (en) * | 2014-07-11 | 2018-06-22 | 英飞凌科技奥地利有限公司 | For the method and apparatus of the controller optimization of regulator |
| CN104600703A (en) * | 2015-02-05 | 2015-05-06 | 重庆大学 | Grid-connected inverter harmonic resonance suppression method based on phase margin compensation |
| CN111435141A (en) * | 2019-01-15 | 2020-07-21 | 中国电力科学研究院有限公司 | Power grid impedance measuring device and method |
| CN111435141B (en) * | 2019-01-15 | 2023-12-15 | 中国电力科学研究院有限公司 | Power grid impedance measurement device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102761138A (en) | LCL type grid-connected inverter without resonance damping and integrated design method thereof | |
| Serban | Power decoupling method for single-phase H-bridge inverters with no additional power electronics | |
| CN102522879B (en) | Active damping method of LCL grid-connected inverter system and circuit for realizing active damping method | |
| US9859714B2 (en) | Multiple input three-phase inverter with independent MPPT and high efficiency | |
| Sun et al. | Grid-tie control of cascade dual-buck inverter with wide-range power flow capability for renewable energy applications | |
| CN201994674U (en) | Reactive power compensation and harmonic suppression device for photovoltaic grid-combined system | |
| CN103078321A (en) | Method for designing LCL (Logical Connection Layer) filter by uniformly controlling photovoltaic grid connection and active power filtering | |
| CN102769291B (en) | Active power filter based on multiphase converter structure | |
| CN103259442B (en) | A kind of High-gain current type inverter | |
| Lu et al. | Resonance propagation of parallel-operated DC-AC converters with LCL filters | |
| CN105553309A (en) | T-type three-level inverter and midpoint balance control method thereof | |
| Liu et al. | Admittance modeling, analysis, and reshaping of harmonic control loop for multiparalleled SAPFs system | |
| Chen et al. | Modeling and triple-loop control of ZVS grid-connected DC/AC converters for three-phase balanced microinverter application | |
| CN105226987A (en) | A kind of inverter control method | |
| CN102545264A (en) | Method for controlling grid-connected inverter based on feed-forward decoupling of state quantity | |
| Itoh et al. | Experimental verification of single-phase inverter with power decoupling function using boost-up chopper | |
| CN107800151B (en) | Island microgrid inverter control method with virtual passive filter | |
| Jo et al. | A new design method of LCL filter for single phase grid connected power converter | |
| CN102723717A (en) | Active power filter structure for zero current detection and control method thereof | |
| Ren et al. | Optimized design of filter for transformerless three-level photovoltaic grid-connected inverter | |
| Huang et al. | PR controller for grid-connected inverter control using direct pole placement strategy | |
| Li et al. | A robust multi-resonant PR regulator for three-phase grid-connected VSI using direct pole placement design strategy | |
| CN104037769A (en) | Parameter design method for single-phase PAPF and output LCL filter | |
| Arulkumar et al. | Design of optimal LLCL filter with an improved control strategy for single phase grid connected PV inverter | |
| CN106655738A (en) | Electrolytic capacitor-free quasi single stage inverter and control method therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20121031 |