CN106786639A  A kind of Active Power FilterAPF improves wideband selfadapting resonance control method  Google Patents
A kind of Active Power FilterAPF improves wideband selfadapting resonance control method Download PDFInfo
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 CN106786639A CN106786639A CN201611040349.3A CN201611040349A CN106786639A CN 106786639 A CN106786639 A CN 106786639A CN 201611040349 A CN201611040349 A CN 201611040349A CN 106786639 A CN106786639 A CN 106786639A
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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
 H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
 H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
 H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
 H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters

 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

 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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]
Abstract
Wideband selfadapting resonance control method is improved the invention discloses a kind of Active Power FilterAPF, point of common coupling threephase voltage is gathered first, electric voltage frequency f is obtained using phaselocked loop_{pll}And phase theta；Then, harmonic detecting module extracts nonlinear load electric current i_{L}Harmonic signal instruction, and obtain output watt current by DC voltage controller and instruct to be added, then subtract each other the input error signal for obtaining current controller with output current feedback signal；Then the current controller by being made up of harmonic controller and PI controllers obtains output control amount；Finally, output control amount, point of common coupling electric voltage feed forward amount obtain PWM ripple modulation instructions signals with being added by the filter capacity current feedback amount three of active damping module.
Description
Technical field
The invention belongs to electric and electronic technical field, more specifically, it is related to a kind of Active Power FilterAPF to improve wide
Frequency selfadapting resonance control method.
Background technology
With the fast development of distributed generation technology, nonlinear load has obtained largescale application, and this also causes
Serious harmonic pollution problems in power network.In order to improve the power network quality of power supply, Active Power FilterAPF has obtained widely should
With.At present, the Current Control Technology in Active Power FilterAPF is formed because it can effectively improve harmonic current compensation precision
For a study hotspot.
Hystersis controller can be used to improve the gain of current control loop, and then improve harmonic current compensation precision.So
And, the switching frequency of hystersis controller is change, and antijamming capability is poor.Repetitive controller can improve electric current loop increasing
Beneficial and switching frequency is fixed, and is particularly wellsuited to the tracking of periodic signal and the suppression of interference signal.But, its frequency adaptability
It is poor, and there is the time delay of primitive period.Document《FrequencyAdaptive FractionalOrder
Repetitive Control of Shunt Active Power Filters》(Transaction on Industrial
Electronics,IEEE[J],2015,62(3):Dividing for parallel connection type active electric filter is proposed in 16591668)
Number rank repetitive controller, also has good dynamic property while frequency adaptability is improved.However, its control algolithm compared with
It is complexity, amount of calculation is larger.Document《HighPerformance Digital Resonant Controllers
Implemented With Two Integrators》(Transaction on Power Electronics,IEEE[J],
2011,26(2):The resonant controller based on second order improper integral is proposed in 563576), it whether there is at center frequency points
Limit gain, can be completely eliminated systematic steady state error.However, needing the resonance of multiple different center frequencies to control in system
Device carries out the tracking of different subharmonic, and this can greatly increase the amount of calculation of control system.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided it is adaptive that a kind of Active Power FilterAPF improves wideband
Resonance control method is answered, using drop time Generalized Integrator, to reduce the amount of calculation of control system, while being carried out at centre frequency
Phase compensation, to increase system stability margin, improves system response time and stability.
For achieving the above object, a kind of Active Power FilterAPF of the invention improves wideband selfadapting resonance controlling party
Method, it is characterised in that comprise the following steps：
(1) the threephase voltage u of point of common coupling, is gathered_{pcc}, horizontal lock is entered to it using phaselocked loop, obtain point of common coupling
The frequency f of voltage_{pll}And phase angle θ；
(2), collection nonlinear load electric current i_{L}, abc α β coordinate transforms are carried out to it, obtain under stationary reference coordinate system
Load current i_{Lαβ}, then current controller harmonic reference signal i is obtained by Harmonic currents detection module_{refαβ}；
(3), collection active electric power filter to output current i_{O}, abc α β coordinate transforms are carried out to it, obtain stationary reference
Output current i under coordinate system_{Oαβ}；
(4) the output watt current instruction Δ i under stationary reference coordinate system, is calculated_{dαβ}：
(4.1), DC voltage specified rate u_{dcref}With the DC voltage u for collecting_{dc}Make the difference, gained difference passes through direct current
Pressure controller obtains the output watt current Δ i under synchronous rotating frame_{d}；
(4.2), by the output watt current Δ i under synchronous rotating frame_{d}Dq α β coordinate transforms are carried out, obtains static
Output watt current instruction Δ i under reference frame_{dαβ}；
(5), the output control amount u of calculating current controller_{piαβ}：
(5.1), calculating current controller error signal delta i_{Lαβ}：By current controller harmonic reference signal i_{refαβ}With it is static
Output current i under reference frame_{Oαβ}Differ from, then Δ i is instructed with the output watt current under stationary reference coordinate system_{dαβ}Ask
With obtain current controller error signal Δ i_{Lαβ}：
Δi_{Lαβ}=i_{refαβ}i_{Oαβ}+Δi_{dαβ}；
(5.2), frequency f of the current controller according to obtained by step (1)_{pll}, by error signal Δ i_{Lαβ}It is sequentially sent to humorous
Wave controller and PI controllers, obtain output control amount u_{piαβ}；
(6) PWM command value V, is calculated_{a} V_{b} V_{c}：
(6.1), by the threephase voltage u of point of common coupling_{pcc}By abc α β coordinate transforms, stationary reference coordinate system is obtained
Under point of common coupling voltage u_{pccαβ}；
(6.2), collection LCL filter capacitance current i_{C}, obtained under stationary reference coordinate system by abc α β coordinate transforms
Capacitance current i_{Cαβ}, then by active damping gain module, obtain the active damping feedback quantity under stationary reference coordinate system
u_{Cαβ}：
u_{Cαβ}=k_{D}·i_{Cαβ}；
Wherein, k_{D}It is active damping gain；
(6.3), by current controller output control amount u_{piαβ}, point of common coupling voltage u under stationary reference coordinate system_{pccαβ}With
And active damping feedback quantity u_{Cαβ}Three is added, then by α βabc coordinate transforms, obtains PWM command value V_{a} V_{b} V_{c}；
(7), modulation instructions value V of the PWM module according to obtained by step (6)_{a} V_{b} V_{c}Corresponding switch controlling signal is obtained,
And then control the breakmake of each IGBT of Active Power FilterAPF.
What goal of the invention of the invention was realized in：
A kind of Active Power FilterAPF of the present invention improves wideband selfadapting resonance control method, and point of common coupling is gathered first
Threephase voltage, electric voltage frequency f is obtained using phaselocked loop_{pll}And phase theta；Then, harmonic detecting module extracts nonlinear load electricity
Stream i_{L}Harmonic signal instruction, with by DC voltage controller obtain output watt current instruct be added, then with output current
Feedback signal subtracts each other the input error signal for obtaining current controller；Then by being made up of harmonic controller and PI controllers
Current controller obtains output control amount；Finally, output control amount, point of common coupling electric voltage feed forward amount and by active damping mould
The filter capacity current feedback amount three of block is added and obtains PWM ripple modulation instructions signals.Harmonic controling in the inventive method
Device is made up of the corresponding modified resonant controller of one group of different rd harmonic signal with parallel form, and changes h rd harmonic signals
, using the drop time improper integral mode based on phase compensation, which algorithm is simple, calculates for corresponding modified resonant controller
Amount is small, reduces algorithm in radio frequency system and calculates the time, while modified resonant controller also introduces phase compensation, increased and is
System stability margin, improves system response time and stability.
Meanwhile, a kind of Active Power FilterAPF of the invention improves wideband selfadapting resonance control method also with following beneficial
Effect：
(1), the algorithm structure is simple, can be programmed using C language, is easily achieved on the controller chips such as DSP；
(2), using depression of order Generalized Integrator, amount of calculation is smaller, shortens controller and calculates the time, saves control chip and deposits
Storage space；
(3), can be applied to Active Power FilterAPF carries out harmonic wave control in power network, microcapacitance sensor, and with higher humorous
Ripple current compensation precision, frequency adaptability is higher.
Brief description of the drawings
Fig. 1 is that Active Power FilterAPF improves wideband selfadapting resonance control method system schematic；
Fig. 2 is current controller control block diagram；
Fig. 3 compensates load harmonic effect oscillogram to be provided without the inventive method；
Fig. 4 is to compensate load harmonic effect oscillogram using the inventive method；
Load harmonic current and power network current spectrogram when Fig. 5 is for compensation load harmonic；
Fig. 6 compensates load harmonic dynamic response oscillogram to be provided without the inventive method；
Fig. 7 is to compensate load harmonic dynamic response oscillogram using the inventive method；
Fig. 8 is that load harmonic effect oscillogram is compensated when mains frequency rises using the inventive method；
Fig. 9 is that load harmonic effect oscillogram is compensated when mains frequency declines using the inventive method.
Specific embodiment
Specific embodiment of the invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably
Understand the present invention.Requiring particular attention is that, in the following description, when known function and design detailed description perhaps
When can desalinate main contents of the invention, these descriptions will be ignored herein.
Embodiment
Describe for convenience, the present embodiment is humorous with the load generation of ThreePhase Parallel Active Power FilterAPF compensating nonlinear
As a example by ripple, narration is in control frequency f_{s}In the case of=10KHz, 5,7,11,13 rd harmonic signals of electric current in compensation network
Specific method：
In the present embodiment, as shown in figure 1, a kind of Active Power FilterAPF of the invention improves wideband selfadapting resonance controlling party
Method, comprises the following steps：
(1) the threephase voltage u of point of common coupling, is gathered_{pcc}, horizontal lock is entered to it using phaselocked loop, obtain point of common coupling
The frequency f of voltage_{pll}And phase angle θ；
(2), collection nonlinear load electric current i_{L}, abc α β coordinate transforms are carried out to it, obtain under stationary reference coordinate system
Load current i_{Lαβ}, then current controller harmonic reference signal i is obtained by Harmonic currents detection module_{refαβ}；
(3), collection active electric power filter to output current i_{O}, abc α β coordinate transforms are carried out to it, obtain stationary reference
Output current i under coordinate system_{Oαβ}；
In the present embodiment, abc α β coordinates are transformed to
(4) the output watt current instruction Δ i under stationary reference coordinate system, is calculated_{dαβ}：
(4.1), DC voltage specified rate u_{dcref}With the DC voltage u for collecting_{dc}Make the difference, gained difference passes through direct current
Pressure controller obtains the output watt current Δ i under synchronous rotating frame_{d}；
Wherein, using PI control modes, PI control mode transmission functions are DC voltage controller：
Wherein K_{pv}And K_{iv}Proportionality coefficient and integral coefficient are represented respectively, and z represents Z domains operator.In the present embodiment, according to
To the modeling analysis in DC voltage control loop, obtain working as K_{pv}=1.6 and K_{iv}When=0.005, the DC voltage controller have compared with
Good static state and dynamic effect.
(4.2), by the output watt current Δ i under synchronous rotating frame_{d}Dq α β coordinate transforms are carried out, obtains static
Output watt current instruction Δ i under reference frame_{dαβ}；
In the present embodiment, in order to output watt current Δ i_{d}Dq α β coordinate transforms are carried out, under synchronous rotating frame
Reactive current Δ i_{q}0, dq α β coordinates are taken to be transformed to
(5), the output control amount u of calculating current controller_{piαβ}：
(5.1), calculating current controller error signal delta i_{Lαβ}：By current controller harmonic reference signal i_{refαβ}With it is static
Output current i under reference frame_{Oαβ}Differ from, then Δ i is instructed with the output watt current under stationary reference coordinate system_{dαβ}Ask
With obtain current controller error signal Δ i_{Lαβ}：
Δi_{Lαβ}=i_{refαβ}i_{Oαβ}+Δi_{dαβ}；
(5.2), current controller, the frequency f according to obtained by step (1)_{pll}, by error signal Δ i_{Lαβ}It is sequentially sent to humorous
Wave controller and PI controllers, obtain output control amount u_{piαβ}, current controller control loop block diagram is as shown in Figure 2；
Wherein, harmonic controller by the corresponding modified resonant controller of one group of different rd harmonic signal with parallel form structure
Into the expression formula of harmonic controller is：
H represents overtone order；X is sign, and x is expressed as positive sequence for "+", and x is expressed as negative phasesequence for "", in the present embodiment
In, overtone order h=1,5,7,11,13, harmonic controller expression formula is HC (z)=G_{1+}(z)+G_{5}(z)+G_{7+}(z)+G_{11}(z)+
G_{13+}(z)；
Wherein, the corresponding modified resonant controller of h rd harmonic signals is using the drop time Generalized Product based on phase compensation
Point mode, the transmission function of the corresponding modified resonant controller of h rd harmonic signals is：
K_{Ih}Represent storage gain；T is the controlling cycle of system；θ_{h}It is phase compensation angle；ω_{1}=2 π f_{pll}Represent fundamental wave angle
Frequency, in the present embodiment, T=1/f_{s}=1/10KHz, K_{I1}=K_{I5}=K_{I7}=K_{I11}=K_{I13}=100, θ_{1}=θ_{5}=θ_{7}=θ_{11}=
θ_{13}=π/4.
Wherein, PI controller transfer functions are：
K_{pi}And K_{ii}Proportionality coefficient and integral coefficient, in the present embodiment, K are represented respectively_{pv}=5.56 and K_{iv}=9.05, when
K_{pv}=5.56 and K_{iv}When=9.05, controller has good dynamic property and stability.
(6) PWM command value V, is calculated_{a} V_{b} V_{c}：
(6.1), by the threephase voltage u of point of common coupling_{pcc}By abc α β coordinate transforms, stationary reference coordinate system is obtained
Under point of common coupling voltage u_{pccαβ}；
(6.2), collection LCL filter capacitance current i_{C}, obtained under stationary reference coordinate system by abc α β coordinate transforms
Capacitance current i_{Cαβ}, then by active damping gain module, obtain the active damping feedback quantity under stationary reference coordinate system
u_{Cαβ}：
u_{Cαβ}=k_{D}·i_{Cαβ}；
Wherein, k_{D}It is active damping gain, in the present embodiment, k_{D}=9；
(6.3), by current controller output control amount u_{piαβ}, point of common coupling voltage u under stationary reference coordinate system_{pccαβ}With
And active damping feedback quantity u_{Cαβ}Three is added, then by α βabc coordinate transforms, obtains PWM command value V_{a} V_{b} V_{c}；
In the present embodiment, abc α β coordinates are transformed to
(7), modulation instructions value V of the PWM module according to obtained by step (6)_{a} V_{b} V_{c}Corresponding switch controlling signal is obtained,
And then control the breakmake of each IGBT of Active Power FilterAPF.
Fig. 3 is the compensation load harmonic effect ripple of the resonant controller based on second order improper integral for being provided without the inventive method
Shape figure, Fig. 4 is to compensate load harmonic effect oscillogram using the resonant controller based on depression of order improper integral of the inventive method：
From figs. 3 and 4 it can be seen that after Active Power FilterAPF compensation harmonic electric current, grid side current waveform is close to just
String ripple, and active electric power filter to output current is smaller to tracking error that reference current is instructed, illustrates based on second order Generalized Product
The resonant controller divided and the resonant controller based on depression of order improper integral for using the inventive method all have good compensation
Effect and compensation precision higher, but can be seen that the resonance based on second order improper integral from both transmission function expression formulas
The exponent number of controller is second order, and the exponent number of the resonant controller based on depression of order improper integral is single order, and the amount of calculation of the latter is obvious
Less than with the former.
Load harmonic current and power network current spectrogram when Fig. 5 is for compensation load harmonic：
From figure 5 it can be seen that harmonic current is by after Active Power FilterAPF compensating action, power network current each harmonic
Content is substantially reduced, and illustrates reducing amount of calculation using the resonant controller based on depression of order improper integral of the inventive method
Also there is good harmonic current compensation performance simultaneously.
Fig. 6 is that the compensation load harmonic of the resonant controller based on second order improper integral for being provided without the inventive method dynamically rings
Oscillogram is answered, Fig. 7 is dynamically to be rung using the compensation load harmonic of the resonant controller based on depression of order improper integral of the inventive method
Answer oscillogram：
It can be seen from figures 6 and 7 that after Active Power FilterAPF starts compensation, the resonance based on depression of order improper integral
The dynamic response time of controller is considerably less than the dynamic response time of the resonant controller based on second order improper integral, illustrates base
After the resonant controller of depression of order improper integral introduces compensation phase, dynamic responding speed accelerates, with more preferable dynamic property.
Fig. 8 is that load harmonic effect oscillogram is compensated when mains frequency rises using the inventive method, and Fig. 9 is using this
Inventive method compensates load harmonic effect oscillogram when mains frequency declines：
From Fig. 8 and Fig. 9 as can be seen that after mains frequency raising and lowering reaches stable state, grid current harmonic content
Very low level is stilled remain in, and dynamic process is very short, illustrates using the inventive method based on the humorous of depression of order improper integral
The controller that shakes can ensure harmonic compensation precision higher in mains frequency fluctuation, with good mains frequency adaptability,
And frequency adaptation wider range, it is ± 5HZ.
Although being described to illustrative specific embodiment of the invention above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the invention is not restricted to the scope of specific embodiment, to the common skill of the art
For art personnel, as long as various change is in appended claim restriction and the spirit and scope of the present invention for determining, these
Change is it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.
Claims (4)
1. a kind of Active Power FilterAPF improves wideband selfadapting resonance control method, it is characterised in that comprise the following steps：
(1) the threephase voltage u of point of common coupling, is gathered_{pcc}, horizontal lock is entered to it using phaselocked loop, obtain point of common coupling voltage
Frequency f_{pll}And phase angle θ；
(2), collection nonlinear load electric current i_{L}, abc α β coordinate transforms are carried out to it, obtain the load under stationary reference coordinate system
Electric current i_{Lαβ}, then current controller harmonic reference signal i is obtained by Harmonic currents detection module_{refαβ}；
(3), collection active electric power filter to output current i_{O}, collection nonlinear load electric current i_{L}, the change of abc α β coordinates is carried out to it
Change, obtain the static load current i examined under coordinate system_{Lαβ}, then current controller harmonic wave ginseng is obtained by Harmonic currents detection module
Examine signal i_{refαβ}；
(4) the output watt current instruction Δ i under stationary reference coordinate system, is calculated_{dαβ}：
(4.1), DC voltage specified rate u_{dcref}With the DC voltage u for collecting_{dc}Make the difference, gained difference passes through DC voltage control
Device obtains the output watt current Δ i under synchronous rotating frame_{d}；
(4.2), by the output watt current Δ i under synchronous rotating frame_{d}Dq α β coordinate transforms are carried out, stationary reference seat is obtained
Output watt current instruction Δ i under mark system_{dαβ}；
(5), the output control amount u of calculating current controller_{piαβ}：
(5.1), calculating current controller error signal delta i_{Lαβ}：By current controller harmonic reference signal i_{refαβ}With stationary reference
Output current i under coordinate system_{Oαβ}Differ from, then Δ i is instructed with the output watt current under stationary reference coordinate system_{dαβ}Summation, obtains
To current controller error signal Δ i_{Lαβ}：
Δi_{Lαβ}=i_{refαβ}i_{Oαβ}+Δi_{dαβ}；
(5.2), frequency f of the current controller according to obtained by step (1)_{pl}, by error signal Δ i_{Lαβ}It is sequentially sent to harmonic controling
Device and PI controllers, obtain output control amount u_{piαβ}；
(6) PWM command value V, is calculated_{a}V_{b}V_{c}：
(6.1), by the threephase voltage u of point of common coupling_{pcc}By abc α β coordinate transforms, obtain under stationary reference coordinate system
Point of common coupling voltage u_{pccαβ}；
(6.2), collection LCL filter capacitance current i_{C}, the electric capacity under stationary reference coordinate system is obtained by abc α β coordinate transforms
Electric current i_{Cαβ}, then by active damping gain module, obtain the active damping feedback quantity u under stationary reference coordinate system_{Cαβ}：
u_{Cα}β=k_{D}·i_{Cαβ}；
(6.3), by current controller output control amount u_{piαβ}, point of common coupling voltage u under stationary reference coordinate system_{pccαβ}And have
Source damps feedback quantity u_{Cαβ}Three is added, then by α βabc coordinate transforms, obtains PWM command value V_{a}V_{b}V_{c}；
(7), modulation instructions value V of the PWM module according to obtained by step (6)_{a}V_{b}V_{c}Corresponding switch controlling signal is obtained, and then is controlled
It is formed with the breakmake of each IGBT of active power filter.
2. Active Power FilterAPF according to claim 1 improves wideband selfadapting resonance control method, it is characterised in that
In described step (4), DC voltage controller is using PI control modes, PI control mode transmission functions：
Wherein, K_{pv}And K_{iv}Proportionality coefficient and integral coefficient are represented respectively, and z represents Z domains operator.
3. Active Power FilterAPF according to claim 1 improves wideband selfadapting resonance control method, it is characterised in that
In described step (5), harmonic controller is by the corresponding modified resonant controller G of one group of different rd harmonic signal_{hx}Z () is with simultaneously
Connection form is constituted, and the expression formula of harmonic controller HC (z) is：
Wherein, h represents overtone order；X is sign, and x is expressed as positive sequence for "+", and x is expressed as negative phasesequence for "".
4. Active Power FilterAPF according to claim 3 improves wideband selfadapting resonance control method, it is characterised in that
The corresponding modified resonant controller of h rd harmonic signals is using the drop time improper integral mode based on phase compensation, its transmission
Function is：
Wherein, K_{Ih}Represent storage gain；T is the controlling cycle of system；θ_{h}It is phase compensation angle；ω_{1}=2 π f_{pll}Represent fundamental wave angle
Frequency.
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CN107968406A (en) *  20171219  20180427  电子科技大学  A kind of adaptive repetitive control of Active Power FilterAPF antisaturation frequency 
CN108039706A (en) *  20171219  20180515  电子科技大学  A kind of Active Power FilterAPF antisaturation frequency selfadapting resonance control method 
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CN109755941A (en) *  20190327  20190514  清华大学  A kind of LCL filter active damping control method and system 
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CN103427419A (en) *  20130822  20131204  宁波中睿电气有限公司  Active power filter selective harmonic compensation control method 
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CN102931660A (en) *  20121115  20130213  国电南京自动化股份有限公司  Quasi proportional resonance control method and control system for parallel active power filter 
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CN107968406A (en) *  20171219  20180427  电子科技大学  A kind of adaptive repetitive control of Active Power FilterAPF antisaturation frequency 
CN108039706A (en) *  20171219  20180515  电子科技大学  A kind of Active Power FilterAPF antisaturation frequency selfadapting resonance control method 
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