CN102097824B - Control method of LCL (Lower Control Limit) type grid-connected inverter - Google Patents

Control method of LCL (Lower Control Limit) type grid-connected inverter Download PDF

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CN102097824B
CN102097824B CN201010617812.2A CN201010617812A CN102097824B CN 102097824 B CN102097824 B CN 102097824B CN 201010617812 A CN201010617812 A CN 201010617812A CN 102097824 B CN102097824 B CN 102097824B
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grid
current
voltage
capacitance
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CN102097824A (en
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王学华
阮新波
刘尚伟
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Huazhong University of Science and Technology
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Abstract

The invention discloses a control method of an LCL (Lower Control Limit) type grid-connected inverter for restricting the influence of grid voltage on grid-connected current. The method comprises the following steps of: (1) detecting capacitance current iC and grid-connected current iL2 by respectively utilizing a current sensor Hi1 of capacitance current and a current sensor Hi2 of filtering capacitance, acquiring a capacitance and current feedback signal iC_of and a grid-connected current feedback signal iL2_of, detecting grid voltage vg by utilizing a voltage sensor Hv2 of the grid voltage and acquiring a grid voltage feedforward signal vg_fd; (2) calculating an error signal e1 according to the iL2_of and iref; (3) carrying out closed-loop processing on the error signal e1 through a controller to obtain a reference signal iC_ref of the capacitance and a current feedback signal iC_of, adding iC_ref to vg_fd, and subtracting the added signal to iC_of to obtain an error signal e2; and (4) generating a PWM (Pulse Width Modulation) control signal for controlling an inverter bridge switching tube by utilizing the error signal e2. The control method of the LCL (Lower Control Limit) type grid-connected inverter for restricting the influence of grid voltage on grid-connected current, provided by the invention, can effectively restrict the influence of the grid voltage on the wave quality of the grid-connected current and improves the grid access power factor. In addition, wave quality of the grid-connected current is good.

Description

A kind of LCL type control method of grid-connected inverter
Technical field
What the present invention relates to is a kind of LCL type control method of grid-connected inverter, is specially a kind of control method of line voltage on the impact of grid-connected current waveform quality that suppress.
Background technology
Fig. 1 is the structure chart of LCL type combining inverter.LCL type combining inverter comprises DC power supply 1, inverter bridge 2, LCL filter 3, public electric wire net 4, and controller 5.Wherein, inverter bridge 2 is by switching tube S 1～S 4and sustained diode 1～D 4form; LCL filter 3 is by filter inductance L 1, L 2form with filter capacitor C.H i1and H i2be respectively Detection capacitance electric current and filter inductance L 2grid-connected current transducer, H v2for voltage detecting transducer.
In the structure of Fig. 1, to controller 5 input grid-connected current instructions and through current sensor H i2obtain flowing through filter inductance L 2grid-connected current.First controller 5 adjusts the phase place of grid-connected current instruction according to phase-locked loop, make itself and network voltage detection transducer H v2the signal homophase detecting, then makes grid-connected current follow the tracks of grid-connected current instruction by closed-loop adjustment.
Herein, the controller 5 of combining inverter is specifically described.Detecting sensor H v2line voltage detected, and try to achieve its phase angle θ, the effective value I that electric network voltage phase angle θ and grid-connected current instruction provide *form together the command value i of grid-connected current reality ref.I refwith current sensor H i2the grid-connected current signal subtraction detecting, the error signal obtaining is sent into adjuster G i, its output signal is as current sensor H i1the command value that detects the capacitance current signal of returning, their error signal is sent in PWM modulator, obtains the control signal of inverter bridge 2 each switching tubes.
At above-mentioned controller 5, do not consider the impact of line voltage on grid-connected current waveform quality.In fact, line voltage, except fundametal compoment, also contains harmonic wave conventionally.The first-harmonic of line voltage can affect the phase place of grid-connected current, and the harmonic wave of line voltage can cause grid-connected current distortion.If do not taken effective measures, do not suppress the impact of line voltage on grid-connected current, will certainly cause the grid-connected current of combining inverter output not meet grid-connected standard.
Summary of the invention
The object of this invention is to provide a kind of LCL type control method of grid-connected inverter of line voltage on grid-connected current impact that suppress, this control method can effectively suppress the impact of line voltage on grid-connected current waveform quality.
A kind of LCL type control method of grid-connected inverter of line voltage on grid-connected current impact that suppress provided by the invention, is characterized in that, the method comprises the steps:
(1) utilize the current sensor H of capacitance current i1detection capacitance current i c, collect capacitor current feedback signal i c_of; Utilize the current sensor H of filter inductance i2detect grid-connected current i l2, collect grid-connected current feedback signal i l2_of; Utilize the voltage sensor H of line voltage v2detection of grid voltage v g, collect voltage feed-forward control signal v g_fd;
(2) according to current feedback signal i l2_ofand reference signal i ref, the formula I of utilization calculates error signal e 1:
E 1=i ref-i l2_offormula I
(3) controller is to error signal e 1carry out closed-loop process, obtain capacitor current feedback signal i c_ofreference signal i c_ref; i c_refwith voltage feed-forward control signal v g_fdbe added signal and capacitor current feedback signal i after being added c_ofsubtract each other to obtain error signal e 2, its formula is formula II;
E 2=i c_ref+ v g_fd-i c_offormula II
(4) utilize error signal e 2, generate the pwm control signal of controlled converter bridge switching parts pipe;
(5) controller judges whether to receive fault-signal; If so, shutdown, otherwise, proceed to step (1).
Technique scheme can adopt following manner to improve:
In step (1), utilize the voltage sensor H of capacitance voltage v1detection capacitance voltage v c, collect capacitance voltage feed-forward signal v c_fd;
In step (3), utilize formula III error signal e 1;
E 2=i c_ref+ v c_fd-i c_offormula III
Control method provided by the invention, by the physical quantity that comprises line voltage information is feedovered to controller by certain functional relation, can effectively suppress the impact of line voltage on grid-connected current waveform quality.In a word, this control method can improve networking power factor, and grid-connected current waveform quality is good simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing LCL type combining inverter;
Fig. 2 is the flow chart of a kind of embodiment of control method provided by the invention;
Fig. 3 is the structural representation that adopts the LCL type combining inverter of control method shown in Fig. 2;
Fig. 4 is the block diagram of the LCL type combining inverter shown in Fig. 2;
Fig. 5 is that the structure of the LCL type combining inverter shown in Fig. 4 realizes schematic diagram;
Fig. 6 is the flow chart of the another kind of embodiment of control method provided by the invention;
Fig. 7 is the structural representation that adopts the LCL type combining inverter of control method shown in Fig. 6;
Fig. 8 is the block diagram of the LCL type combining inverter shown in Fig. 7;
Fig. 9 is that the structure of the LCL type combining inverter shown in Fig. 8 realizes schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Control method provided by the present invention as shown in Figure 2, the steps include:
(1) utilize respectively the current sensor H of capacitance current i1with filter inductance L 2current sensor H i2detection capacitance current i cwith grid-connected current i l2, collect capacitor current feedback signal i c_ofwith grid-connected current feedback signal i l2_of; Utilize voltage sensor H v2detection of grid voltage v g, collect voltage feed-forward control signal v g_fd.
(2) according to current feedback signal i l2_ofand reference signal i refcalculate error signal e 1, its formula is formula I.
E 1=i ref-i l2_offormula I
(3) controller is to error signal e 1carry out closed-loop process, obtain capacitor current feedback signal i c_ofreference signal i c_ref.I c_refwith voltage feed-forward control signal v g_fdbe added signal and capacitor current feedback signal i after being added c_ofsubtract each other to obtain error signal e 2, its formula is formula II.
E 2=i c_ref+ v g_fd-i c_offormula II
(4) utilize error signal e 2, the pwm control signal that generation can controlled inverter bridge 2 switching tubes;
(5) controller judges whether to receive fault-signal.If so, shutdown, otherwise, proceed to step (1).
As shown in Figure 3, above-mentioned control method realizes by increase feedfoward control module 6 in controller 5.Controller 5 and feedfoward control module 6 are realized by microprocessor, and microprocessor can adopt the digital signal processing chips such as DSP or ARM.
Microprocessor gathers voltage sensor H v2voltage signal and the current sensor H of output i1and H i2the current signal of output, after the relative program computing in microprocessor, the pwm signal of four switching tubes of inverter bridge 2 is controlled in generation.
Fig. 4 is the block diagram of the LCL type combining inverter shown in Fig. 2.Wherein, G ifor regulating error device, common adoption rate-integral controller.G invfor the gain of inverter bridge 2, v aBfor inverter bridge 2 output voltages.K 1, k 2and k 3be respectively capacitance current i c, grid-connected current i l2with line voltage v gsampling coefficient, its size depends on A/D sampling A/D chip, according to sampling coefficient k 1and k 2obtain capacitor current feedback signal i c_ofwith grid-connected current feedback signal i l2_of.Z l1, Z cand Z l2be respectively filter inductance L 1, filter capacitor C and filter inductance L 2impedance.G fdfor voltage feed-forward control function, v g_fdfor the voltage feed-forward control signal collecting.
I reffor grid-connected current feedback signal i l2_ofreference signal, e 1for the error signal obtaining according to formula I.E 1through regulating error device G iafter obtain capacitor current feedback signal i c_ofreference signal i c_ref, reference signal i c_ref, capacitor current feedback signal i c_ofwith voltage feed-forward control signal v g_fdthrough formula, II obtains error signal e 2, utilize error signal e 2, the pwm control signal that generation can controlled inverter bridge 2 switching tubes, obtains inverter bridge 2 output voltage v aB.V aBafter LCL filter 3, obtain grid-connected current i l2.
As shown in Figure 5, during square frame shown in specific implementation Fig. 4, increase a pll controller 7, its effect is to guarantee grid-connected current i l2with line voltage v gsame-phase, their phase angle is θ.According to the sine table in phase angle θ and microcontroller, obtain grid-connected current i l2reference signal i ref.
Because more significant harmonic wave in electrical network is the lower harmonic wave of some frequencies (in single-phase as 3 times, 5 times, 7 times and 9 inferior, in three-phase as 5 times, 7 times, 11 inferior).And when frequency is lower, capacitance voltage v in Fig. 1 cbe approximately equal to line voltage v g.Can adopt capacitance voltage v cas feed-forward signal.As shown in Figure 5, Fig. 6 is the controlling party block diagram that Fig. 5 is corresponding.
Be that control method provided by the invention also can adopt handling process as shown in Figure 6, the steps include:
(1) utilize respectively the current sensor H of capacitance current i1with filter inductance L 2current sensor H i2detection capacitance current i cwith grid-connected current i l2, collect capacitor current feedback signal i c_ofwith grid-connected current feedback signal i l2_of; Utilize respectively the voltage sensor H of capacitance voltage v1voltage sensor H with line voltage v2detection of grid voltage v gand v c, collect voltage feed-forward control signal v g_fdwith capacitance voltage feed-forward signal v c_fd.
(2) utilize formula I error signal e 1.
(3) controller is to error signal e 1carry out closed-loop process, obtain capacitor current feedback signal i c_ofreference signal i c_ref.I c_refwith capacitance voltage feed-forward signal v c_fdbe added signal and capacitor current feedback signal i after being added c_ofsubtract each other to obtain error signal e 2, its formula is formula III.
E 2=i c_ref+ v c_fd-i c_offormula III
(4) pass through error signal e 2pwm control signal that can controlled inverter bridge 2 switching tubes.
(5) controller judges whether to receive fault-signal, if so, and shutdown, otherwise, proceed to step (1).
As shown in Figure 7, above-mentioned control method realizes by increase feedfoward control module 6 in controller 5.Controller 5 and feedfoward control module 6 are realized by microprocessor, and microprocessor can adopt the digital signal processing chips such as DSP or ARM.
Microprocessor gathers voltage sensor H v1and H v2voltage signal and the current sensor H of output i1and H i2the current signal of output, after the relative program computing in microprocessor, the pwm signal of four switching tubes of inverter bridge 2 is controlled in generation.
Fig. 8 is the block diagram of the LCL type combining inverter shown in Fig. 6.Wherein, G ifor regulating error device, common adoption rate-integral controller.G invfor the gain of inverter bridge 2, v aBfor inverter bridge 2 output voltages.K 1, k 2, k 3and k 4be respectively capacitance current i c, grid-connected current i l2, line voltage v gwith capacitance voltage v csampling coefficient, its size depends on A/D sampling A/D chip, according to sampling coefficient k 1and k 2obtain capacitor current feedback signal i c_ofwith grid-connected current feedback signal i l2_of.Z l1, Z cand Z l2be respectively filter inductance L 1, filter capacitor C and filter inductance L 2impedance.G fdfor voltage feed-forward control function, v g_fdfor the voltage feed-forward control signal collecting.
I reffor grid-connected current feedback signal i l2_ofreference signal, e 1for the error signal obtaining according to formula I.E 1through regulating error device G iafter obtain capacitor current feedback signal i c_ofreference signal i c_ref, reference signal i c_ref, capacitor current feedback signal i c_ofwith voltage feed-forward control signal v c_fdthrough formula III, obtain error signal e 2, utilize error signal e 2, the pwm control signal that generation can controlled inverter bridge 2 switching tubes, obtains inverter bridge 2 output voltage v aB.V aBafter LCL filter 3, obtain grid-connected current i l2.
As shown in Figure 9, during square frame shown in specific implementation Fig. 8, increase a pll controller 7, its effect is to guarantee grid-connected current i l2with line voltage v gsame-phase, their phase angle is θ.According to the sine table in phase angle θ and microcontroller, obtain grid-connected current i l2reference signal i ref.
Below, the first embodiment of the present invention is described to concrete enforcement as shown in Figure 5.
(1) line voltage is through voltage sensor H v2decay k 3doubly, send in phase-locked loop 7, obtain voltage signal v gphase theta.The grid-connected current instruction effective value I that electric network voltage phase angle θ and controller 5 provide *form together the command value i of grid-connected current reality ref.
(2) grid-connected current is through current sensor H i2decay k 2doubly and the command value i of grid-connected current reality refafter subtracting each other, send into adjuster G i, its output signal is as the command value of capacitance current.This command value and current sensor H i1decay k 1capacitor current feedback signal subtraction doubly, the signal that subtracts each other rear gained with line voltage through the function G that feedovers fdafter signal plus, can obtain determining the modulation signal of duty ratio.
(3) modulation signal is sent in PWM modulator, can be obtained the pwm control signal of each switching tube.
Function when line voltage feedback signal time, each harmonic in line voltage can be reduced to 0 in theory.Function G fdcomprise three, proportional; A differential term; Second differential item.Wherein, proportional mainly suppresses low-order harmonic, and one time differential term mainly suppresses medium-frequency harmonic, and second differential item mainly suppresses high-frequency harmonic.Because the harmonic components in electrical network is unfixing, the size of each harmonic is also often to change, so can be according to actual conditions to function G fdsuitably simplify.
(3A) when the low-order harmonic in line voltage enriches as 3 times, 5 times or 7 inferior harmonic waves, time, function G fdcan be reduced to G fd ≈ 1 k 3 G inv H v ;
(3B) when the medium-frequency harmonic in line voltage enriches as 13 times, 15 inferior harmonic waves, function G fdcan be reduced to G fd ≈ 1 + sC H i 1 G inv k 3 G inv H v ;
(3C) when the high-frequency harmonic in line voltage is relatively given prominence to as being greater than the harmonic content of 21 times, G fdcan be reduced to G fd = 1 + s CH i 1 G inv + s 2 L 1 C k 3 G inv H v .
Below, the second embodiment of the present invention is described to concrete enforcement as shown in Figure 9.The steps include:
(1) line voltage is through voltage sensor H v2decay k 3doubly, send in phase-locked loop 7, obtain voltage signal v gphase theta.The grid-connected current instruction effective value I that electric network voltage phase angle θ and controller 5 provide *form together the command value i of grid-connected current reality ref.
(2) grid-connected current is through current sensor H i2decay k 2doubly and the command value i of grid-connected current reality refafter subtracting each other, send into adjuster G i, its output signal is as the command value of capacitance current.This command value and current sensor H i1decay k 1capacitor current feedback signal subtraction doubly, subtracts each other the signal of rear gained and capacitance voltage through voltage sensor H v1decay k 4doubly and feedforward function G fdafter signal plus, can obtain determining the modulation signal of duty ratio.
(3) modulation signal is sent in PWM modulator, can be obtained the pwm control signal of each switching tube.
Work as function
Figure GDA00003533273600081
can effectively suppress each harmonic in line voltage and reduce, attention scheme two is that feedforward amount is capacitance voltage with scheme one difference, and this scheme can not be eliminated the impact of mains by harmonics on grid-connected current completely.Function G fdcomprise two, proportional and a differential term.Wherein, proportional mainly suppresses low-order harmonic, and one time differential term mainly suppresses medium-frequency harmonic.The main cause of ignoring second differential item is that the high-frequency harmonic content in line voltage is very little.Equally, scheme two also can be to function G fdsuitably simplify.
(3A) when the low-order harmonic in line voltage enriches as 3 times, 5 times or 7 inferior harmonic waves, time, function G fdcan be reduced to G fd ≈ 1 k 3 G inv H v ;
(3B) when the medium-frequency harmonic in line voltage enriches as 13 times, 15 inferior harmonic waves, function G fdcan be reduced to G fd ≈ 1 + sC H i 1 G inv k 3 G inv H v .
The present invention is not only confined to above-mentioned embodiment; persons skilled in the art are according to content disclosed by the invention; can adopt other multiple embodiment to implement the present invention; therefore; every employing project organization of the present invention and thinking; do some simple designs that change or change, all fall into the scope of protection of the invention.

Claims (1)

1. a LCL type control method of grid-connected inverter, is characterized in that, the method comprises the steps:
(1) utilize Detection capacitance current i ccurrent sensor H i1detect the capacitance current i in LCL type combining inverter output filter c, collect capacitor current feedback signal i c_of; Utilize detection filter inductance L 2current sensor H i2detect the grid-connected current i of close grid side in LCL type combining inverter output filter l2, collect grid-connected current feedback signal i l2_of; Utilize line voltage v gvoltage sensor H v2detection of grid voltage v g, collect voltage feed-forward control signal v g_fd;
And utilize capacitance voltage v cvoltage sensor H v1detection capacitance voltage v c, collect capacitance voltage feed-forward signal v c_fd;
(2) according to grid-connected current feedback signal i l2_ofand reference signal i ref, the formula I of utilization calculates error signal e 1:
E 1=i ref-i l2_offormula I
(3) controller is to error signal e 1carry out closed-loop process, obtain capacitor current feedback signal i c_ofreference signal i c_ref; Reference signal i c_refwith capacitance voltage feed-forward signal v c_fdbe added signal and capacitor current feedback signal i after being added c_ofsubtract each other to obtain error signal e 2, its formula is formula II;
E 2=i c_ref+ v c_fd-i c_offormula II
(4) utilize error signal e 2, generate the pwm control signal of controlled converter bridge switching parts pipe;
(5) controller judges whether to receive fault-signal; If so, shutdown, otherwise, proceed to step (1).
CN201010617812.2A 2010-12-31 2010-12-31 Control method of LCL (Lower Control Limit) type grid-connected inverter Expired - Fee Related CN102097824B (en)

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