CN104600705A - Active power filter based on inverter side current feedback and current control method of active power filter - Google Patents

Active power filter based on inverter side current feedback and current control method of active power filter Download PDF

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Publication number
CN104600705A
CN104600705A CN201510063599.8A CN201510063599A CN104600705A CN 104600705 A CN104600705 A CN 104600705A CN 201510063599 A CN201510063599 A CN 201510063599A CN 104600705 A CN104600705 A CN 104600705A
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China
Prior art keywords
current
filter
inverter side
feedback
active power
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CN201510063599.8A
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Chinese (zh)
Inventor
许杏桃
许胜�
王益明
陈群
黄文静
李然
许杏明
沈鹏
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JIANGSU ANFANG POWER TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
Original Assignee
JIANGSU ANFANG POWER TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd
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Application filed by JIANGSU ANFANG POWER TECHNOLOGY Co Ltd, State Grid Corp of China SGCC, State Grid Jiangsu Electric Power Co Ltd, Electric Power Research Institute of State Grid Jiangsu Electric Power Co Ltd filed Critical JIANGSU ANFANG POWER TECHNOLOGY Co Ltd
Priority to CN201510063599.8A priority Critical patent/CN104600705A/en
Publication of CN104600705A publication Critical patent/CN104600705A/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/20—Active power filtering [APF]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses an active power filter based on inverter side current feedback and a current control method of the active power filter. The active power filter comprises an APF (active power filter) system and an LCL filter, and the APF system is in a three-phase bridge type parallel structure. The current control method includes that feedback current of a current closed-loop control system takes inverter side current i1, a master controller GA (s) adopts PI control, and capacitance current feedback control is adopted. By means of feedback adjustment of LCL filter capacitance current on the basis of traditional feedback control of single inverter side current, control precision of the system is improved while resonance of the LCL filter and power grid parameters can be restrained.

Description

A kind of Active Power Filter-APF based on inverter side current feedback and current control method thereof
Technical field
The present invention relates to a kind of Active Power Filter-APF based on inverter side current feedback and current control method thereof, belong to Active Power Filter-APF control field.
Background technology
HF switch harmonic wave is the inevitable outcome of PWM rectifier, for the Active Power Filter-APF (Active Power Filter, APF) of compensation network harmonic wave, its high-frequency harmonic inflow electrical network should be avoided to cause the secondary pollution of electrical network.For this reason, people install output filter in the grid-connected side of device usually.Be compared to other filters such as the mono-inductive type of L, LCL type filter has good filter effect, and the filter inductance needed is less, but LCL filter easily produces resonance, the stability of influential system.
The closed-loop current control feedback current of LCL type APF can select inverter side electric current and current on line side.The closed-loop control system of current on line side feedback is owing to comprising LCL link, and system is difficult to stable, usually adopts active or passive damped method to suppress resonance peak to improve the stability of system.Passive damped method is without the need to adopting complicated control algolithm, and control system simple and stable, subject matter is the increase in extra damping loss.Active damping method strengthens system damping by control algolithm, such as existing employing state feedback and dead-beat control method, the method better performances, but needs more transducer; And for example increase the control method of additional delay, system resonance peak value can be reduced to below 0dB, and without the need to extra transducer, but the additional delay in closed-loop control system can reduce entire system stability and control precision equally; Comparatively speaking, the current on line side feedback adopting capacitor current feedback is more typical effective control method.
And adopting the closed-loop control system of inverter side current feedback more easily to stablize, the subject matter of existence is the existence due to LCL filter, there is error between the controlled electric current of inverter side and net side output current, thus affects APF harmonic suppression effect; Meanwhile, filter capacitor and net side inductance and electrical network parameter between exist resonance may.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of Active Power Filter-APF based on inverter side current feedback and current control method thereof, improves the control precision of APF output current and suppresses the resonance of LCL filter and electrical network parameter.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of Active Power Filter-APF based on inverter side current feedback, comprises APF system, it is characterized in that: it also comprises LCL filter.
As a further improvement on the present invention, described APF system is three-phase bridge parallel connection type structure.
As a further improvement on the present invention, described APF system comprises three phase network power supply u g, commutation of load device and voltage type active filter, described LCL filter comprises three groups of inverter side inductance L 1, net side inductance L 2, filter capacitor C fwith damping resistance R d, three phase network power supply u gthree-phase input end is interconnected, three phase network power supply u gthree-phase output end is connected with commutation of load device three inputs respectively, voltage type active filter three outputs respectively with three inverter side inductance L 1one end connect, three inverter side inductance L 1the other end net side inductance L with three respectively 2one end connect, three net side inductance L 2the other end be connected with three inputs of commutation of load device, three filter capacitor C fone end be interconnected, three filter capacitor C fthe other end respectively with three damping resistance R done end connect, three damping resistance R dthe other end respectively with three inverter side inductance L 1the other end connect.
As a further improvement on the present invention, the feedback current of current close-loop control system gets inverter side current i 1, master controller G as () adopts PI to control, adopt capacitor current feedback to control.
As a further improvement on the present invention, described capacitor current feedback controls to be by capacitance current i cnegative feedback is to master controller G as, after (), feedback controller adoption rate controls.
The present invention compared with prior art, have the following advantages and effect: the present invention is on tradition single inverter side Current Feedback Control basis, add the feedback regulation of LCL filter capacitor electric current, improve the control precision of system and suppress the resonance of LCL filter and electrical network parameter; Relative to two kinds of conventional methods of the single inverter side Current Feedback Control of tradition and current on line side feedback+filter capacitor Current Feedback Control, current close-loop control system based on this current control method has larger stability margin and damping action, thus has stronger stability and good resonance rejection ability.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of a kind of Active Power Filter-APF based on inverter side current feedback of the present invention.
Fig. 2 is the circuit one phase equivalent circuit illustraton of model of a kind of Active Power Filter-APF based on inverter side current feedback of the present invention.
Fig. 3 is the closed-loop current control block diagram of the current control method of a kind of Active Power Filter-APF based on inverter side current feedback of the present invention.
Fig. 4 is the closed-loop current control block diagram of tradition based on single inverter side current feedback.
Fig. 5 is the closed-loop current control block diagram of tradition based on current on line side feedback+capacitor current feedback.
Fig. 6 is the G of the current control method of a kind of Active Power Filter-APF based on inverter side current feedback of the present invention k3(s), G k4(s) and G k5the Bode figure of (s).
Fig. 7 is the G of the current control method of a kind of Active Power Filter-APF based on inverter side current feedback of the present invention b3(s), G b4(s) and G b5the Bode figure of (s).
Embodiment
Below by embodiment, also the present invention is described in further detail by reference to the accompanying drawings, and following examples are explanation of the invention and the present invention is not limited to following examples.
As shown in Figure 1, a kind of Active Power Filter-APF based on inverter side current feedback of the present invention comprises APF system and LCL filter, and APF system is three-phase bridge parallel connection type structure.APF system comprises three phase network power supply u g, commutation of load device and voltage type active filter, LCL filter comprises three groups of inverter side inductance L 1, net side inductance L 2, filter capacitor C fwith damping resistance R d, three phase network power supply u gthree-phase input end is interconnected, three phase network power supply u gthree-phase output end is connected with commutation of load device three inputs respectively, voltage type active filter three outputs respectively with three inverter side inductance L 1one end connect, three inverter side inductance L 1the other end net side inductance L with three respectively 2one end connect, three net side inductance L 2the other end be connected with three inputs of commutation of load device, three filter capacitor C fone end be interconnected, three filter capacitor C fthe other end respectively with three damping resistance R done end connect, three damping resistance R dthe other end respectively with three inverter side inductance L 1the other end connect.
The current control method of a kind of Active Power Filter-APF based on inverter side current feedback of the present invention, the feedback current of current close-loop control system gets inverter side current i 1, master controller G as () adopts PI to control, adopt capacitor current feedback to control, by capacitance current i cnegative feedback is to master controller G as, after (), feedback controller adoption rate controls.
In Fig. 1, C is APF DC bus capacitor, R g, L gfor electrical network equivalence resistance sense, L i, R lfor load branch equivalent inductance and rectifier ohmic load, i 1, i 2be respectively inverter side electric current and current on line side.To simplify the analysis, if electrical network three-phase symmetrical is undistorted.
In view of the hree-phase symmetry of circuit, below for single-phase analysis and Control principle.According to Fig. 1, set up the one phase equivalent circuit model of LCL type APF, as Fig. 2.In figure, u is APF output voltage, and urc is filter branch RC voltage drop, the same Fig. 1 of other parameters.Set up current i 1, i2 relative to the transfer function model of voltage u, be defined as G1 (s) and G2 (s) respectively:
G 1 ( s ) = I 1 ( s ) U ( s ) = ( L 2 + L g ) C f s 2 + ( R d + R g ) C f s + 1 L 1 ( L 2 + L g ) C f s 3 + ( ( R d + R g ) L 1 + R d ( L 2 + L g ) ) C f s 2 + ( L 1 + L 2 + L g + R d R g C f ) s + R g - - - ( 1 )
G 2 ( s ) = I 2 ( s ) U ( s ) = R d C f s + 1 L 1 ( L 2 + L g ) C f s 3 + ( ( R d + R g ) L 1 + R d ( L 2 + L g ) ) C f s 2 + ( L 1 + L 2 + L g + R d R g C f ) s + R g - - - ( 2 )
As shown in Figure 3, the feedback current of closed-loop current control adopts inverter side current i 1, and capacitance current ic is fed back to u place, and feedback factor is Kc.
As shown in Figure 4, the feedback current of closed-loop current control adopts inverter side current i 1.
As shown in Figure 5, the feedback current of closed-loop current control adopts current on line side i2, and capacitance current ic is fed back to u place, and feedback factor is Kc.
According to Fig. 3 ~ Fig. 5, the open-loop transfer function of 3 kinds of control system can be obtained, be defined as Gk3 (s), Gk4 (s) and Gk5 (s) successively:
G k 3 ( s ) = G A ( s ) × G 3 ( s ) G k 4 ( s ) = G A ( s ) × G 4 ( s ) G k 5 ( s ) = G A ( s ) × G 5 ( s ) - - - ( 3 )
Wherein:
G A ( s ) = K P + K I s
G 3 ( s ) = ( L 2 + L g ) C f s 2 + ( R d + R g ) C f s + 1 L 1 ( L 2 + L g ) C f s 3 + ( ( R d + R g ) L 1 + ( R d + K c ) ( L 2 + L g ) ) C f s 2 + ( L 1 + L 2 + L g + ( R d + K c ) R g C f ) s + R g
G 4 ( s ) = G 1 ( s ) = ( L 2 + L g ) C f s 2 + ( R d + R g ) C f s + 1 L 1 ( L 2 + L g ) C f s 3 + ( ( R d + R g ) L 1 + R d ( L 2 + L g ) ) C f s 2 + ( L 1 + L 2 + L g + R d R g C f ) s + R g
G 5 ( s ) = R d C f s + 1 L 1 ( L 2 + L g ) C f s 3 + ( ( R d + R g ) L 1 + ( R d + K c ) ( L 2 + L g ) ) C f s 2 + ( L 1 + L 2 + L g + ( R d + K c ) R g C f ) s + R g
Can obtain Gk3 (s) by formula (3), Gk4 (s) schemes with the Bode of Gk5 (s), and Selecting parameter is
Parameter Numerical value
Reactor L 1/mH 0.25
Reactor L 2/mH 0.03
Filter capacitor resistance C f/μF，R d/mΩ 10，100
Network system impedance L g/mH，R g/mΩ 0.02，20
Switching frequency (sample frequency) f/kHz 10
PI controling parameters K P，K I 1，1
Capacitive feedback COEFFICIENT K c 1
According to Fig. 6, analyze all kinds of control system performance by the magnitude-phase characteristics of Gk3 (s), Gk4 (s) and Gk5 (s):
(1) magnitude-phase characteristics comparing Gk3 (s), Gk4 (s) and Gk5 (s) is known, and the stability margin based on the current close-loop control system of current on line side feedback is lower;
(2) amplitude-frequency characteristic comparing Gk3 (s), Gk4 (s) and Gk5 (s) is known, low frequency and the high frequency characteristics of Gk3 (s), Gk4 (s) are close, but the resonance peak of Gk3 (s) is less than Gk4 (s) and Gk5 (s).
If the closed loop transfer function, of the output current i2 relative instruction current i * of above-mentioned 3 kinds of current close-loop control systems is followed successively by Gb3 (s), Gb4 (s) and Gb5 (s), then can obtain corresponding magnitude-phase characteristics as shown in Figure 7.
Analysis chart 7 is known, under certain parameter condition, Gb3 (s), Gb4 (s) and Gb5 (s) has close low frequency and high frequency characteristics, near resonance frequency, Gb4 (s) is substantially identical with the resonance characteristic of Gb5 (s), and the resonance peak of Gk3 (s) is significantly less than Gb4 (s) and Gb5 (s).
From analyzing above, the closed-loop current control strategy based on inverter side current feedback of the present invention, is all better than other two kinds of traditional control methods in stability of control system and resonance damping capacity two.

Claims (5)

1., based on an Active Power Filter-APF for inverter side current feedback, comprise APF system, it is characterized in that: it also comprises LCL filter.
2. a kind of Active Power Filter-APF based on inverter side current feedback according to claim 1, is characterized in that: described APF system is three-phase bridge parallel connection type structure.
3. a kind of Active Power Filter-APF based on inverter side current feedback according to claim 1, is characterized in that: described APF system comprises three phase network power supply u g, commutation of load device and voltage type active filter, described LCL filter comprises three groups of inverter side inductance L 1, net side inductance L 2, filter capacitor C fwith damping resistance R d, three phase network power supply u gthree-phase input end is interconnected, three phase network power supply u gthree-phase output end is connected with commutation of load device three inputs respectively, voltage type active filter three outputs respectively with three inverter side inductance L 1one end connect, three inverter side inductance L 1the other end net side inductance L with three respectively 2one end connect, three net side inductance L 2the other end be connected with three inputs of commutation of load device, three filter capacitor C fone end be interconnected, three filter capacitor C fthe other end respectively with three damping resistance R done end connect, three damping resistance R dthe other end respectively with three inverter side inductance L 1the other end connect.
4. a current control method for the Active Power Filter-APF based on inverter side current feedback according to claim 1, is characterized in that: the feedback current of current close-loop control system gets inverter side current i 1, master controller G as () adopts PI to control, adopt capacitor current feedback to control.
5. current control method according to claim 4, is characterized in that: described capacitor current feedback controls to be by capacitance current i cnegative feedback is to master controller G as, after (), feedback controller adoption rate controls.
CN201510063599.8A 2015-02-06 2015-02-06 Active power filter based on inverter side current feedback and current control method of active power filter Pending CN104600705A (en)

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Cited By (5)

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CN105633969A (en) * 2016-03-29 2016-06-01 四川英杰电气股份有限公司 Active power filter power source harmonic compensation system and method
CN105656035A (en) * 2016-03-01 2016-06-08 天津中科华瑞电气技术开发有限公司 Control circuit and method of unified power quality controller
CN106099930A (en) * 2016-07-05 2016-11-09 许昌学院 APF system based on LCL type wave filter and control system thereof
CN112653343A (en) * 2020-12-12 2021-04-13 中南大学 LCL type grid-connected single inverter current feedback active damping method
CN113839387A (en) * 2021-11-29 2021-12-24 湖北工业大学 LCL type active power filter system and method of passive interface

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CN105656035A (en) * 2016-03-01 2016-06-08 天津中科华瑞电气技术开发有限公司 Control circuit and method of unified power quality controller
CN105656035B (en) * 2016-03-01 2018-11-30 天津中科华瑞电气技术开发有限公司 A kind of control circuit and method of Unified Power Quality Controller
CN105633969A (en) * 2016-03-29 2016-06-01 四川英杰电气股份有限公司 Active power filter power source harmonic compensation system and method
CN105633969B (en) * 2016-03-29 2018-02-16 四川英杰电气股份有限公司 A kind of active filter supply harmonic compensation system and method
CN106099930A (en) * 2016-07-05 2016-11-09 许昌学院 APF system based on LCL type wave filter and control system thereof
CN112653343A (en) * 2020-12-12 2021-04-13 中南大学 LCL type grid-connected single inverter current feedback active damping method
CN113839387A (en) * 2021-11-29 2021-12-24 湖北工业大学 LCL type active power filter system and method of passive interface

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