CN102340257A - Double-current loop control method of LCL (Inductor Capacitor Inductor) filtering grid-connected inverter - Google Patents
Double-current loop control method of LCL (Inductor Capacitor Inductor) filtering grid-connected inverter Download PDFInfo
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- CN102340257A CN102340257A CN2011102573080A CN201110257308A CN102340257A CN 102340257 A CN102340257 A CN 102340257A CN 2011102573080 A CN2011102573080 A CN 2011102573080A CN 201110257308 A CN201110257308 A CN 201110257308A CN 102340257 A CN102340257 A CN 102340257A
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Abstract
The invention relates to a double-current loop control method of an LCL (Inductor Capacitor Inductor) filtering grid-connected inverter, belonging to the field of inserter control. The method comprises the steps of: respectively sampling inductive currents at a grid side and inductive currents at an inverter bridge side by using two groups of current sensors; respectively converting the inductive currents ia1, b1 and c1 at the grid side and the inductive currents ia2, b2 and c2 at the inverter bridge side under a stationary coordinate system into currents id1 and q1 as well as id2 and q2 under a two-phase rotating coordinate system; and then by taking id1 and id2 as feedback variables of an active current control loop and taking iq1 and iq2 as feedback variables of the active current control loop, sending output signals of the two control loops and phase signals of a power grid voltage to a SVPWM (Space Vector Pulse Width Modulation) module, wherein the SVPWM module is used for outputting corresponding switch driving signals so as to control the quality of grid current waveform of the inverter. The method disclosed by the invention has the advantages of high control precision, high power factor, convenience for protecting a bridge-arm switching tube and the like.
Description
Technical field
The present invention relates to a kind of double-current ring control method of LCL filtering combining inverter, be used for realizing the direct networking Current Control of LCL filtering combining inverter, to improve the waveform quality and the power factor of networking electric current.
Technical background
Because the combining inverter outlet side is connected to electrical network through series LC L filter; More help inverter than obtaining high-quality network access electric current under the low switching frequency; So key equipment that the combining inverter of LCL filtering generates electricity by way of merging two or more grid systems as new forms of energy; Obtained extensive concern in recent years, yet the introducing of LCL filter has improved the exponent number of system, the control strategy of system has been proposed requirements at the higher level.Adopting the LCL filtering combining inverter system of the direct single closed-loop control of typical grid-connected current, is unsettled; Adopt the control method of inductance or capacitance terminal connection in series-parallel damping, can avoid system unstable, but cause power loss; Adopt control brachium pontis electric current; Or realize method for indirectly controlling to grid-connected current through controlling other electric current variablees; Improved the stability of closed-loop system; But indirect current control is difficult to accomplish the unity power factor operation of network access electric current, and receives the influence of line voltage distortion and background harmonics interference easily.Therefore, the control method of studying novel LCL filtering combining inverter networking electric current has important significance for theories and practical value.
Summary of the invention:
The present invention is intended to for LCL filtering combining inverter a kind of novel direct networking current control method, the requirement that this method can guarantee the stability of a system are provided; Can improve the waveform quality and the power factor of networking electric current again; Simultaneously help again protecting the brachium pontis switching tube, guarantee the safe and reliable operation of system.
The double-current ring control method of a kind of LCL filtering combining inverter of the present invention; Shown in accompanying drawing 1, comprise based on the HF switch three phase inverter bridge, connect inverter bridge and the LCL filter of electrical network, the detection transmitter that is used to detect each inductive current, line voltage the lock phase module, with the three-phase current the three phase static coordinate under convert to biphase current under the two synchronised rotating coordinate systems coordinate transformation unit 1 and coordinate transformation unit 2, be respectively applied for three-phase current with the three-phase current of grid side and inverter bridge side carry out coordinate transform, 4 be used for the current error adjusting current regulator.The major control process prescription is following: at first with the net side inductive current i under the rest frame
A1, b1, c1With inverter bridge side inductive current i
A2, b2, c2Be transformed into the current i under the two cordic phase rotators system respectively
D1, q1,And i
D2, q2, then with i
D1Given reference signal i with the control grid-connected current
D1 *Compare, relatively the error signal of back output gives proportional and integral controller 1 (PI
1), the output signal of adjuster 1 is as inverter bridge side current component i
D2Given signal, with i
D2Compare, relatively the error signal of back output gives proportional and integral controller 2 (PI
2), with i
Q1Given reference signal i with the control grid-connected current
Q1 *Compare, relatively the error signal of back output gives proportional and integral controller 3 (PI
3), the output signal of adjuster 3 is as inverter bridge side current component i
Q2Given signal, with i
Q2Compare, relatively the error signal of back output gives proportional and integral controller 4 (PI
4); Give SVPWM module the output signal of adjuster 2 and adjuster 4 and the phase signal of line voltage again; Behind drive circuit, control the work of converter bridge switching parts pipe by the switching drive signal of SVPWM module output, to control the networking current phase and the amplitude of combining inverter system.
Compare with the control method of existing LCL filtering grid-connected current, LCL filtering combining inverter double-current ring control method proposed by the invention has following outstanding advantage:
1) controls the direct control that has realized the networking electric current through outer shroud, both helped improving the control precision of networking electric current, improved the power factor of networking electric current again, and line voltage distortion and background harmonics interference are had stronger inhibition ability;
2) the interior ring control that increases through the inverter bridge side inductive current of sampling has simultaneously not only improved the stability of system, and has helped the protection of brachium pontis switch, improves the reliability of system.
The double-current ring control method of LCL combining inverter proposed by the invention; Have control precision height, high, the high outstanding advantage of system reliability of power factor; Be very suitable for photovoltaic; New forms of energy such as fuel cell, wind-force grid-connected system, and adopt the single-phase and three-phase LCL combining inverter of various forms PWM control all can use method of the present invention.
Description of drawings
Accompanying drawing 1 is an overall structure block diagram of the present invention.
Line voltage, inverter side inductive current, net side networking electric current and modulating wave waveform when accompanying drawing 2 is steady operation.
Accompanying drawing 3 is spectrum analysis results of A phase grid-connected current.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail: present embodiment provided execution mode and operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Shown in the accompanying drawing 1 is the overall structure block diagram of the double-current ring control method of a kind of LCL filtering combining inverter of proposing of the present invention, it is characterized in that comprising direct-current input power supplying V
d, the input side capacitor C
1, based on the three-phase inverter of HF switch pulse width modulation controlled, be used for the LCL filter that inverter is connected with electrical network, the inductance that connects grid side is L
1a, L
1b, L
1c, the inductance that connects the inverter bridge side is L
2a, L
2b, L
2c, three filter capacitor C
2, C
3And C
4, net side three-phase current detection transmitter 1, inverter bridge side three-phase current detection transmitter 2, at first with the current on line side detection signal i under the three phase static coordinate system
A1, b1, c1Be transformed into the current i under the two cordic phase rotators system
D1, q1, with the inverter bridge side current detection signal i under the three phase static coordinate system
A2, b2, c2Be transformed into the current i under the two cordic phase rotators system
D2, q2, then with i
D1Given reference signal i with the control grid-connected current
D1 *Compare, relatively the error signal of back output gives proportional and integral controller 1 (PI
1), the output signal of adjuster 1 is as inverter bridge side current component i
D2Given signal, with i
D2Compare, relatively the error signal of back output gives proportional and integral controller 2 (PI
2), with i
Q1Given reference signal i with the control grid-connected current
Q1 *Compare, relatively the error signal of back output gives proportional and integral controller 3 (PI
3), the output signal of adjuster 3 is as inverter bridge side current component i
Q2Given signal, with i
Q2Compare, relatively the error signal of back output gives proportional and integral controller 4 (PI
4); Give SVPWM module the output signal of adjuster 2 and adjuster 4 and the phase signal of line voltage again; Behind drive circuit, control the work of converter bridge switching parts pipe by the switching drive signal of SVPWM module output, to control the networking current phase and the amplitude of combining inverter system.
For correctness of the present invention and feasibility are described, the three-phase inverter system of being incorporated into the power networks of a 10kVA has been carried out simulating, verifying.Simulation parameter is: DC bus-bar voltage 690V, line voltage are 380V, and switching frequency is 20kHz, and the The dead time of switch is 3 μ s, and the wave filter on AC side parameter is L1=0.8mH, L2=1.4mH, C=5 μ F.Accompanying drawing 2 and 3 is the concrete emulation experiment waveform of this embodiment.
Line voltage, inverter side inductive current, grid-connected current and modulating wave waveform during accompanying drawing 2 expression steady operations; Accompanying drawing 3 is spectrum analysis results of A phase grid-connected current; Can find out that current on line side THD is only 1.29%, the phase place of current on line side and line voltage are very approaching; System has realized low harmonic wave, and High Power Factor is incorporated into the power networks.
Claims (1)
1. the double-current ring control method of a LCL filtering combining inverter is characterized in that comprising direct-current input power supplying V
d, the input side capacitor C
1, based on the three-phase inverter of HF switch pulse width modulation controlled, be used for the LCL filter that inverter is connected with electrical network, the inductance that connects grid side is L
1a, L
1b, L
1c, the inductance that connects the inverter bridge side is L
2a, L
2b, L
2c, three filter capacitor C
2, C
3And C
4, net side three-phase current detection transmitter 1, inverter bridge side three-phase current detection transmitter 2, at first with the current on line side detection signal i under the three phase static coordinate system
A1, b1, c1Be transformed into the current i under the two cordic phase rotators system
D1, q1, with the inverter bridge side current detection signal i under the three phase static coordinate system
A2, b2, c2Be transformed into the current i under the two cordic phase rotators system
D2, q2, then with i
D1Given reference signal i with the control grid-connected current
D1 *Compare, relatively the error signal of back output is given proportional and integral controller 1, and the output signal of adjuster 1 is as inverter bridge side current component i
D2Given signal, with i
D2Compare, relatively the error signal of back output is given proportional and integral controller 2, with i
Q1Given reference signal i with the control grid-connected current
Q1 *Compare, relatively the error signal of back output is given proportional and integral controller 3, and the output signal of adjuster 3 is as inverter bridge side current component i
Q2Given signal, with i
Q2Compare; Relatively the error signal of back output is given proportional and integral controller 4; Give SVPWM module the output signal of adjuster 2 and adjuster 4 and the phase signal of line voltage again; Behind drive circuit, control the work of converter bridge switching parts pipe by the switching drive signal of SVPWM module output, to control the networking current phase and the amplitude of combining inverter system.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594107A (en) * | 2012-03-15 | 2012-07-18 | 华中科技大学 | LCL filter utilizing integrated inductors |
| CN103475033A (en) * | 2013-09-27 | 2013-12-25 | 重庆大学 | Current control method and system for three-phase LCL type grid-connected inverter without phase locking link |
| 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 |
| CN103888009A (en) * | 2014-03-26 | 2014-06-25 | 深圳科士达科技股份有限公司 | Single-phase three-level photovoltaic inverter system |
| CN103973151A (en) * | 2014-06-03 | 2014-08-06 | 哈尔滨工业大学 | Decoupling control method for three-phase pulse width modulation (PWM) grid-connected inverter under inductance imbalanc condition |
| CN105186920A (en) * | 2015-09-02 | 2015-12-23 | 国网上海市电力公司 | Energy conversion apparatus and control method therefor |
| CN105186573A (en) * | 2015-10-27 | 2015-12-23 | 夏百战 | Current control system based on LCL filter technology |
| CN105958853A (en) * | 2015-12-16 | 2016-09-21 | 许昌学院 | PWM gird connected inverter control method of permanent magnetism wind generator system |
| CN105978018A (en) * | 2015-12-16 | 2016-09-28 | 许昌学院 | LC grid-connected inverter control method |
| CN107395002A (en) * | 2017-08-17 | 2017-11-24 | 南京南瑞继保电气有限公司 | Suppress the method and device of harmonic voltage |
| CN109585215A (en) * | 2018-11-15 | 2019-04-05 | 深圳中嘉智联能源科技有限公司 | A kind of vacuum switch arc quenching system and method based on virtual voltage feedforward control |
| CN110048631A (en) * | 2019-03-22 | 2019-07-23 | 天津大学 | A kind of three-phase four-wire system gird-connected inverter method for suppressing neutral current |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075108A (en) * | 2011-01-20 | 2011-05-25 | 哈尔滨工业大学 | Capacitance current feedforward control method for grid-connected inverter with LCL filter |
-
2011
- 2011-09-02 CN CN2011102573080A patent/CN102340257A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075108A (en) * | 2011-01-20 | 2011-05-25 | 哈尔滨工业大学 | Capacitance current feedforward control method for grid-connected inverter with LCL filter |
Non-Patent Citations (1)
| Title |
|---|
| 邓翔等: "LCL滤波并网逆变电源的控制策略研究", 《电机与控制学报》, vol. 15, no. 5, 31 May 2011 (2011-05-31), pages 37 - 41 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102594107A (en) * | 2012-03-15 | 2012-07-18 | 华中科技大学 | LCL filter utilizing integrated inductors |
| CN103475033A (en) * | 2013-09-27 | 2013-12-25 | 重庆大学 | Current control method and system for three-phase LCL type grid-connected inverter without phase locking link |
| 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 |
| CN103888009A (en) * | 2014-03-26 | 2014-06-25 | 深圳科士达科技股份有限公司 | Single-phase three-level photovoltaic inverter system |
| CN103973151B (en) * | 2014-06-03 | 2016-06-15 | 哈尔滨工业大学 | The decoupling control method of three-phase PWM combining inverter when inductance unbalance |
| CN103973151A (en) * | 2014-06-03 | 2014-08-06 | 哈尔滨工业大学 | Decoupling control method for three-phase pulse width modulation (PWM) grid-connected inverter under inductance imbalanc condition |
| CN105186920A (en) * | 2015-09-02 | 2015-12-23 | 国网上海市电力公司 | Energy conversion apparatus and control method therefor |
| CN105186573A (en) * | 2015-10-27 | 2015-12-23 | 夏百战 | Current control system based on LCL filter technology |
| CN105958853A (en) * | 2015-12-16 | 2016-09-21 | 许昌学院 | PWM gird connected inverter control method of permanent magnetism wind generator system |
| CN105978018A (en) * | 2015-12-16 | 2016-09-28 | 许昌学院 | LC grid-connected inverter control method |
| CN107395002A (en) * | 2017-08-17 | 2017-11-24 | 南京南瑞继保电气有限公司 | Suppress the method and device of harmonic voltage |
| CN107395002B (en) * | 2017-08-17 | 2019-06-04 | 南京南瑞继保电气有限公司 | Inhibit the method and device of harmonic voltage |
| CN109585215A (en) * | 2018-11-15 | 2019-04-05 | 深圳中嘉智联能源科技有限公司 | A kind of vacuum switch arc quenching system and method based on virtual voltage feedforward control |
| CN109585215B (en) * | 2018-11-15 | 2023-03-14 | 深圳中嘉智联能源科技有限公司 | Vacuum switch arc extinguishing system and method based on virtual voltage feedforward control |
| CN110048631A (en) * | 2019-03-22 | 2019-07-23 | 天津大学 | A kind of three-phase four-wire system gird-connected inverter method for suppressing neutral current |
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Application publication date: 20120201 |