CN107026477A - The light current control method of grid-connected inverter off the net with voltage feed-forward control lag compensation - Google Patents

The light current control method of grid-connected inverter off the net with voltage feed-forward control lag compensation Download PDF

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CN107026477A
CN107026477A CN201710382872.2A CN201710382872A CN107026477A CN 107026477 A CN107026477 A CN 107026477A CN 201710382872 A CN201710382872 A CN 201710382872A CN 107026477 A CN107026477 A CN 107026477A
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control
phase
voltage
point
common coupling
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张兴
李明
杨莹
张行
李飞
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Hefei University of Technology
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Hefei University of Technology
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01Arrangements for reducing harmonics or ripples
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40Arrangements for reducing harmonics

Abstract

The invention discloses a kind of light current control method of grid-connected inverter off the net with voltage feed-forward control lag compensation.The present invention is directed in the case of light current net directly to be feedovered caused combining inverter stability problem using line voltage, propose a kind of control method of voltage feed-forward control lag compensation, this method on voltage feed-forward control passage by way of increasing LPF link, it ensure that combining inverter is identical with the fundamental wave gain of the direct feedforward control of line voltage, realize being tracked without steady-state error for fundamental wave.The present invention can not only suppress power network background harmonicses, and be added significantly to phase margin of the combining inverter in the case of light current net, improve the grid adaptability of combining inverter.

Description

The light current control method of grid-connected inverter off the net with voltage feed-forward control lag compensation
Technical field
The present invention relates to the control method of grid-connected inverter system, there is line voltage more particularly, to a kind of light current is off the net The control method of grid-connected inverter for the lag compensation that feedovers.
Background technology
With developing rapidly for distributed generation system, combining inverter is used widely.Due in remoteness In distributed generation system, the presence of long range transmission line and a large amount of potential devices can bring one can not ignore to power network Equiva lent impedance so that light current net characteristic is presented in power network.In the case of the light current net with high impedance, meeting between inverter and power network A dynamic interacted system is formed, the system can be made in its point of common coupling (point of common coupling, PCC) Decline into combining inverter control system bandwidth, influence its control stability.Combining inverter is directly feedovered using line voltage Current harmonics that can be caused by effective compensation power network background harmonicses is so as to obtain a wide range of applications, but there have document to point out to be weak The stability margin of combining inverter can be greatly reduced using the direct feedforward control of line voltage under grid condition, may be caused grid-connected Inverter is unstable, and such as Xu Jin inscriptions, Xie Shaojun and Tang Ting are published in August in 2014 25《Proceedings of the CSEE》34th Roll up on the 24th phase《Light current LCL filtering combining inverters self-adaptive current control off the net》, this article points out light current power network off the net electricity Pressure ratio example feedforward can form positive feedback passage, and the stability margin of LCL type combining inverter is greatly reduced, system is even resulted in unstable It is fixed.
Therefore, money is strong, Xie Shaojun and Ji Lin etc. are published on November 20th, 2016《Proceedings of the CSEE》Volume 36 On 22nd phase《A kind of Current Control Strategy for lifting inverter to power network adaptability》, this article is pointed out can be by reducing electricity The feedforward gain of net voltage, to improve the stability margin of combining inverter, this method improves parallel network reverse to a certain extent The stability of device, but this method can make combining inverter that fundamental wave gain is greatly reduced, and be unfavorable for fundamental wave tracking, add grid-connected Steady-state error between current feedback values and command value.
In addition, combining inverter stability can be improved by reducing the bandwidth of phaselocked loop light current is off the net, such as:Wu Permanent, Ruan Xinbo and Yang Dongsheng are published on October 25th, 2014《Proceedings of the CSEE》On the 30th phase of volume 34《Light current Influence research and pll parameter design of the phaselocked loop to LCL type combining inverter stability under the conditions of net》, this article is according to phase angle Margin requirement is designed to the parameter of phaselocked loop, changes the bandwidth of phaselocked loop, enhances inverter under current source mode To the adaptability of different electric network impedances, but this kind of method significantly reduces the rapidity that combining inverter locks phase, now, if Electric network impedance is very big, in order that combining inverter stable operation, bandwidth of phase lock loop needs to be transferred to very low, now, is not suitable for The high occasion of dynamic performance requirements.
In summary, there is problems with prior art:
(1) weak grid condition is directed to, existing literature can cause grid-connected inverse using the method for the direct feedforward control of line voltage The stability for becoming device is greatly reduced, can be with lifting system stability by the feedforward gain for reducing line voltage, but this method Fundamental wave gain can be reduced, the steady-state error between grid-connected current feedback value and command value is added, is unfavorable for fundamental wave tracking;
(2) in the existing control program based on voltage feed-forward control, it is not directed to by voltage feed-forward control passage Addition LPF link constitutes voltage feed-forward control lag compensation to realize the problem of grid-connected inverters are stable.
The content of the invention
To overcome the limitation of above-mentioned various technical schemes, for being led in the case of light current net using line voltage directly feedforward The combining inverter stability problem of cause, proposes a kind of control method of voltage feed-forward control lag compensation, this method by Increase the mode of LPF link on voltage feed-forward control passage, it is ensured that combining inverter and line voltage directly feedover control The fundamental wave gain of system is identical, realizes being tracked without steady-state error for fundamental wave.The present invention can not only suppress power network background harmonicses, and And phase margin of the combining inverter in the case of light current net is added significantly to, improve the grid adaptability of combining inverter.
The object of the present invention is achieved like this.It is off the net delayed with voltage feed-forward control that the present invention proposes a kind of light current The control method of grid-connected inverter of compensation, the key step of this control method is as follows:
Step 1, collection output grid-connected current iga、igb、igc, and point of common coupling voltage upcca、upccb、upccc
Step 2, the point of common coupling voltage u gathered according to step 1pcca、upccb、upccc, through three-phase static coordinate system to two The transformation equation of cordic phase rotator system obtains point of common coupling voltage dq axis components upccd、upccq;By point of common coupling voltage upcca、upccb、upcccPoint of common coupling voltage phase angle θ is mutually obtained by phase-locked loop pll lock;
The point of common coupling voltage is by the transformation equation of three-phase static coordinate system to two-phase rotating coordinate system:
Step 3, the point of common coupling voltage phase angle θ obtained according to step 2, rotates by three-phase static coordinate system to two-phase The conversion of coordinate system, the output grid-connected current i that step 1 is gatheredga、igb、igcIt is converted into output under two-phase rotating coordinate system simultaneously Net electric current dq components igdAnd igq
It is described output grid-connected current be by the transformation equation of three-phase static coordinate system to two-phase rotating coordinate system:
Step 4, output grid-connected current command signal i is setgdref, igqref;The output grid-connected current obtained according to step 3 Dq components igdAnd igq, control signal u is obtained by power network current closed-loop control equationdAnd uq
The power network current closed-loop control equation is:
ud=(kp+ki/s)·(igdref-igd)
uq=(kp+ki/s)·(igqref-igq)
K in formulapFor electric current loop pi regulator proportional control factor, kiFor electric current loop pi regulator integral control coefficient, s For Laplace operator;
Step 5, the point of common coupling voltage phase angle θ obtained according to step 2, the control signal u that step 4 is obtaineddAnd uqThrough Two-phase rotating coordinate system is crossed to the transformation equation of three-phase static coordinate system, the control signal point under three-phase static coordinate system is converted into Measure ua、ub、uc
The control signal is by the transformation equation of two-phase rotating coordinate system to three-phase static coordinate system:
ua=udcosθ-uqsinθ
Step 6, the point of common coupling voltage u obtained according to step 1pcca、upccb、upccc, it is delayed by voltage feed-forward control Equation is compensated, voltage feed-forward control signal u is obtainedpcca_f、upccb_f、upccc_f
The voltage feed-forward control lag compensation equation is:
K in formulapwmFor the PWM inversion link gains of three-phase full-bridge inverter, ωcFor cutting that voltage feed-forward control is filtered Only frequency;
Step 7, the control signal component u under the three-phase static coordinate system obtained according to step 5a、ub、uc, respectively with step 6 obtained voltage feed-forward control signal upcca_f、upccb_f、upccc_fIt is added, obtains three-phase full-bridge inverter bridge arm voltage control letter Number, then the switching signal for generating power device of inverter is modulated by SVPWM, control three phase full bridge inverse by Drive Protecting Circuit Become turning on and off for device power device.
Preferably, point of common coupling voltage phase angle θ calculation formula is described in step 2:
Wherein ω0For the specified angular frequency of point of common coupling voltage, Kp_PLLAnd Ki_PLLRespectively phaselocked loop pi regulator Proportional control factor and integral adjustment coefficient, s is Laplace operator.
Compared with prior art, the advantageous effect of present invention is that:
1st, the present invention can not only suppress power network background harmonicses, and be added significantly to combining inverter in weak grid condition Under phase margin, improve the stability of inverter;
2nd, present invention improves reduction line voltage feedforward gain control program exist fundamental wave gain reduction the problem of, It ensure that being tracked without steady-state error for light current combining inverter fundamental wave off the net;
3rd, the limit of combining inverter control system closed loop transfer function, of the invention is improved farther away from RHP Combining inverter adds the grid adaptability of combining inverter in light current stability off the net;
4th, the present invention need to only be realized on voltage feed-forward control passage plus a LPF link composition lag compensation Mode is simple and effective.
Brief description of the drawings
Topological structure when the three-phase LCL type combining inverter that Fig. 1 is used by the embodiment of the present invention is connected with light current net Schematic diagram.
Fig. 2 is the light current of the present invention combining inverter control structure schematic diagram off the net that feedforward is filtered based on line voltage.
Fig. 3 is the Bode diagram of the open-loop transfer function under different electric network impedances in the direct feedforward control of line voltage.
Fig. 4 is the baud of the open-loop transfer function under different electric network impedances when adding voltage feed-forward control filtering control Figure.
Fig. 5 is combining inverter closed loop transfer function, with pole distribution figure when electric network impedance changes.
Inverter output grid-connected current harmonic spectrogram when Fig. 6 is feedforward control direct using line voltage.
Fig. 7 is inverter output grid-connected current harmonic spectrogram when filtering feedforward control using line voltage.
Embodiment
The embodiment provides a kind of light current combining inverter off the net with voltage feed-forward control lag compensation Using combining inverter caused by line voltage directly feedforward in the case of control method, the light current net to solve prior art presence Stability problem, on voltage feed-forward control passage increase LPF link by way of, it is ensured that combining inverter with The fundamental wave gain of the direct feedforward control of line voltage is identical, realizes being tracked without steady-state error for fundamental wave.The present invention can not only Suppress power network background harmonicses, and be added significantly to phase margin of the combining inverter in the case of light current net, improve grid-connected The grid adaptability of inverter.
Clear, complete description is carried out to technical scheme below in conjunction with accompanying drawing.
The topological structure that the embodiment of the present invention is used is as shown in Figure 1.The topological structure includes DC side filter capacitor Cdc、 Three-phase bridge type inverse topology, inverter side inductance L1, filter capacitor C, damping resistance Rd, net side inductance L2, LCL type wave filter lead to Point of common coupling PCC is crossed with carrying electric network impedance ZgThree phase network be connected, rgFor electric network impedance ZgResistive component, LgFor electricity Net impedance ZgPerceptual weight, rgAnd LgConstitute electric network impedance Zg, electric network impedance ZgExpression formula is as follows:
Zg=rg+s·Lg
S in formula is Laplace operator.In the present embodiment, Cdc=600 μ F, L1=0.9mH, C=40 μ F, Rd=0.15 Ω, L2=0.1mH, rg=0, Lg=1.2mH.
Fig. 2 is the light current combining inverter control structure schematic diagram off the net that feedforward is filtered based on line voltage.Can by Fig. 2 See, the present invention is made up of following steps:
Step 1, collection output grid-connected current iga、igb、igc, and point of common coupling voltage upcca、upccb、upccc
Step 2, the point of common coupling voltage u gathered according to step 1pcca、upccb、upccc, through three-phase static coordinate system to two The transformation equation of cordic phase rotator system obtains point of common coupling voltage dq axis components upccd、upccq;By point of common coupling voltage upcca、upccb、upcccPoint of common coupling voltage phase angle θ is mutually obtained by phase-locked loop pll lock.
Point of common coupling is by the transformation equation of three-phase static coordinate system to two-phase rotating coordinate system:
Point of common coupling voltage phase angle θ calculation formula is:
Wherein ω0For the specified angular frequency of point of common coupling voltage, Kp_PLLAnd Ki_PLLRespectively phaselocked loop pi regulator Proportional control factor and integral adjustment coefficient, s is Laplace operator.In the present embodiment, ω0=314rad/s, Kp_PLL= 2000, Ki_PLL=1.
Step 3, the point of common coupling voltage phase angle θ obtained according to step 2, rotates by three-phase static coordinate system to two-phase The conversion of coordinate system, the output grid-connected current i that step 1 is gatheredga、igb、igcIt is converted into output under two-phase rotating coordinate system simultaneously Net electric current dq components igdAnd igq
Export grid-connected current is by the transformation equation of three-phase static coordinate system to two-phase rotating coordinate system:
Step 4, output grid-connected current command signal i is setgdref, igqref;The output grid-connected current obtained according to step 3 Dq components igdAnd igq, control signal u is obtained by power network current closed-loop control equationdAnd uq
Power network current closed-loop control equation is:
ud=(kp+ki/s)·(igdref-igd)
uq=(kp+ki/s)·(igqref-igq)
K in formulapFor electric current loop pi regulator proportional control factor, kiFor electric current loop pi regulator integral control coefficient, s For Laplace operator.
Step 5, the point of common coupling voltage phase angle θ obtained according to step 2, the control signal u that step 4 is obtaineddAnd uqThrough Two-phase rotating coordinate system is crossed to the transformation equation of three-phase static coordinate system, the control signal point under three-phase static coordinate system is converted into Measure ua、ub、uc
Control signal is by the transformation equation of two-phase rotating coordinate system to three-phase static coordinate system:
ua=udcosθ-uqsinθ
Step 6, the point of common coupling voltage u obtained according to step 1pcca、upccb、upccc, it is delayed by voltage feed-forward control Equation is compensated, voltage feed-forward control signal u is obtainedpcca_f、upccb_f、upccc_f
Voltage feed-forward control lag compensation equation is:
K in formulapwmFor the PWM inversion link gains of three-phase full-bridge inverter, ωcFor cutting that voltage feed-forward control is filtered Only frequency.The present embodiment Kpwm=1, ωc=3140rad/s.
Step 7, the component u under the three-phase static coordinate system obtained according to step 5a、ub、uc, obtained respectively with step 6 Voltage feed-forward control signal upcca_f、upccb_f、upccc_fIt is added, obtains three-phase full-bridge inverter bridge arm voltage control signal difference For:ua+upcca_f、ub+upccb_f、uc+upccc_f, then the switching signal for generating power device of inverter is modulated by SVPWM, pass through Drive Protecting Circuit controls turning on and off for three-phase full-bridge inverter power device.
Fig. 3 is to be of the invention in the direct feedforward control of line voltage, and electric network impedance is followed successively by Lg=1.2mH, 2.4mH, The Bode diagram of open-loop transfer function during 3.6mH.Fig. 4 is to be of the invention when adding voltage feed-forward control lag compensation, and power network hinders It is anti-to be followed successively by LgThe Bode diagram of open-loop transfer function when=1.2mH, 2.4mH, 3.6mH.Wherein, PM represents phase in Fig. 3 and Fig. 4 Position nargin (phase margin, PM).Comparison diagram 3 and Fig. 4, can significantly have found:The side directly feedovered using line voltage Formula, with the increase of electric network impedance, the phase margin PM of combining inverter is gradually reduced, delayed by introducing voltage feed-forward control Phase margin PM is significantly increased after compensation;Also, introduce voltage feed-forward control filtering control strategy and do not change open loop transmission letter Gain at several low frequencies, it is ensured that the fundamental wave tracking performance of combining inverter.
Fig. 5 show combining inverter closed loop transfer function, with electric network impedance LgLimit when increasing to 4.8mH by 1.2 Distribution map.The direction of arrow represents electric network impedance L in Fig. 5gThe direction of increase, what region 1 was represented is to add voltage feed-forward control to mend The pole distribution of closed loop transfer function, when repaying, what region 2 was represented is closed loop transfer function, when directly being feedovered using line voltage Pole distribution.Closed loop is passed when adding voltage feed-forward control lag compensation with directly being feedovered using line voltage in Fig. 5 by comparing The pole distribution position of delivery function, it can be found that voltage feed-forward control lag compensation control strategy proposed by the present invention can make to close Central pole effectively improves inverter in light current stability off the net away from RHP.
Fig. 6 and Fig. 7 sets forth using the direct feedforward control of line voltage and add voltage feed-forward control lag compensation When inverter output grid-connected current and corresponding harmonic spectrum figure.Comparison diagram 6 and Fig. 7 can be found that light current proposed by the present invention Control method of grid-connected inverter off the net with voltage feed-forward control lag compensation can be effectively improved light current inverter off the net Grid-connected current quality, improves the stability of combining inverter.

Claims (2)

1. a kind of light current control method of grid-connected inverter off the net with voltage feed-forward control lag compensation, it is characterised in that this The key step of control method is as follows:
Step 1, collection output grid-connected current iga、igb、igc, and point of common coupling voltage upcca、upccb、upccc
Step 2, the point of common coupling voltage u gathered according to step 1pcca、upccb、upccc, revolved through three-phase static coordinate system to two-phase The transformation equation for turning coordinate system obtains point of common coupling voltage dq axis components upccd、upccq;By point of common coupling voltage upcca、 upccb、upcccPoint of common coupling voltage phase angle θ is mutually obtained by phase-locked loop pll lock;
The point of common coupling voltage is by the transformation equation of three-phase static coordinate system to two-phase rotating coordinate system:
Step 3, the point of common coupling voltage phase angle θ obtained according to step 2, by three-phase static coordinate system to two cordic phase rotators The conversion of system, the output grid-connected current i that step 1 is gatheredga、igb、igcThe grid-connected electricity of output being converted under two-phase rotating coordinate system Flow dq components igdAnd igq
It is described output grid-connected current be by the transformation equation of three-phase static coordinate system to two-phase rotating coordinate system:
Step 4, output grid-connected current command signal i is setgdref, igqref;The output grid-connected current dq components obtained according to step 3 igdAnd igq, control signal u is obtained by power network current closed-loop control equationdAnd uq
The power network current closed-loop control equation is:
ud=(kp+ki/s)·(igdref-igd)
uq=(kp+ki/s)·(igqref-igq)
K in formulapFor electric current loop pi regulator proportional control factor, kiFor electric current loop pi regulator integral control coefficient, s is drawing General Laplacian operater;
Step 5, the point of common coupling voltage phase angle θ obtained according to step 2, the control signal u that step 4 is obtaineddAnd uqBy two Cordic phase rotator is tied to the transformation equation of three-phase static coordinate system, is converted into the control signal component under three-phase static coordinate system ua、ub、uc
The control signal is by the transformation equation of two-phase rotating coordinate system to three-phase static coordinate system:
ua=udcosθ-uqsinθ
Step 6, the point of common coupling voltage u obtained according to step 1pcca、upccb、upccc, pass through voltage feed-forward control lag compensation Equation, obtains voltage feed-forward control signal upcca_f、upccb_f、upccc_f
The voltage feed-forward control lag compensation equation is:
K in formulapwmFor the PWM inversion link gains of three-phase full-bridge inverter, ωcThe cutoff frequency filtered for voltage feed-forward control Rate;
Step 7, the control signal component u under the three-phase static coordinate system obtained according to step 5a、ub、uc, obtained respectively with step 6 The voltage feed-forward control signal u arrivedpcca_f、upccb_f、upccc_fIt is added, obtains three-phase full-bridge inverter bridge arm voltage control signal, The switching signal of generation power device of inverter is modulated by SVPWM again, three phase full bridge inversion is controlled by Drive Protecting Circuit Device power device is turned on and off.
2. a kind of light current according to claim 1 combining inverter control off the net with voltage feed-forward control lag compensation Method, it is characterised in that point of common coupling voltage phase angle θ calculation formula is described in step 2:
Wherein ω0For the specified angular frequency of point of common coupling voltage, Kp_PLLAnd Ki_PLLThe respectively ratio of phaselocked loop pi regulator Adjustment factor and integral adjustment coefficient, s is Laplace operator.
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