CN109066684A - A kind of three phase active electric power filter and its control method based on LCL filtering - Google Patents
A kind of three phase active electric power filter and its control method based on LCL filtering Download PDFInfo
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- CN109066684A CN109066684A CN201811216125.2A CN201811216125A CN109066684A CN 109066684 A CN109066684 A CN 109066684A CN 201811216125 A CN201811216125 A CN 201811216125A CN 109066684 A CN109066684 A CN 109066684A
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Classifications
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- 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
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- 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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Abstract
The invention belongs to three phase active electric power filter technical field more particularly to a kind of three phase active electric power filters and its control method based on LCL filtering.Three phase active electric power filter based on LCL filtering includes three-phase inverter, output filter and control system；The three-phase inverter is voltage source inverter, and energy storage original part is DC capacitor；The output filter is third-order filter, includes inverter side filter inductance, filter capacitor, grid side filter inductance；The control system is the current double closed-loop control of power network current detection, inverter side current feedback.The present invention directly controls grid current harmonic component by power network current close-loop control mode, avoids the existing detection delay of traditional load current detection method and assignment phase offset；The resonance spikes that automatic virtual blocks inhibit LCL filter are introduced by inverter side current feedback.
Description
Technical field
The invention belongs to three phase active electric power filter technical fields more particularly to a kind of three-phase based on LCL filtering to have
Active power filter and its control method.
Background technique
With the extensive use of electronic power conversion device, electric energy has obtained more fully utilizing, but a large amount of non-linear
Load device being widely used in power grid, so that the harmonic pollution problems in power grid are increasingly serious, harmonic wave control is by people
It is more and more to pay attention to.Active Power Filter-APF (Act ive Power Fi lter, APF) and it is traditional by inductance, capacitor with
And the passive power filter of resistance composition is compared, and has that filtering characteristic is good, controllability is high, fast response time, flexible in application etc.
Feature.With the reduction of semiconductor devices cost, APF is increasingly becoming the research hotspot and hair of domestic and international power supply system harmonics restraint
Open up direction.
The common current control method of APF mainly has hysteretic loop current control, Repetitive controller and PI control.Hysteretic loop current control
Have the advantages that realize that simple, robustness is good, but can not achieve zero steady state error control, and switching frequency is uncertain, gives output filter
The design of wave device brings difficulty；Repetitive controller can realize zero steady-state error tracking, but its dynamic property to Complicated Periodic signal
It is poor, real time reaction cannot be carried out to disturbance, it will usually generate the delay in a reference cycle.PI control be it is the most classical, answer
With most commonly used control method.Its structure is simple, easily designed, DAZ gene may be implemented, but due to APF command signal
In contain multiple frequency sine signals, and PI control method to the control effect of the cycles per instruction signal of upper frequency and is paid no attention to
Think, it is difficult to realize that zero steady-state error tracks.In addition, improper integral control, the compound control of sliding formwork control and different control methods
System is increasingly by the extensive concern of scholar.
With the continuous development of semiconductor technology, capacity is continuously improved, and price gradually reduces so that APF progressively towards
Large capacity, high power density direction develop, in order to inhibit APF switching frequency current harmonic wave, the selection of output filter is especially
It is important.It is poor that traditional L-type filter filters out switching harmonics effect, and biggish inductance value is needed under high-power applications occasion
It is able to satisfy corresponding demand, this not only makes the compensation current changing rate decline of output, and dynamic performance reduces, and causes entire
System bulk is big, at high cost, and power loss is big.LCL filter becomes the research hotspot of people in recent years, the former is prominent relatively
Advantage is that comparatively ideal high-frequency harmonic decaying and switching harmonics inhibition can be realized with lesser total inductance amount out, high-power
Application, cost advantage is obvious, while also improving the dynamic property of system, but needs to be added damping control to inhibit resonance
Spike.There are two methods of passive damping and active damping at present, passive damping is simple and reliable, but damages under high-power occasion
Consumption is serious.Active damping avoids resonance problems by control algolithm, mainly there is the active of through path additional character filter
Damped method, the active damping method based on model reduction and the active damping method based on state variable feedback.
Summary of the invention
(1) technical problems to be solved
For existing technical problem, the present invention provides a kind of three phase active electric power filter based on LCL filtering
And its control method, avoid the problem of existing detection delay of traditional load current detection method is with amplitude phase offset.
(2) technical solution
In order to achieve the above object, the main technical schemes that the present invention uses include:
A kind of three phase active electric power filter based on LCL filtering comprising three-phase inverter, output filter and control
System processed；
The three-phase inverter is voltage source inverter, and energy storage original part is DC capacitor；
The output filter is third-order filter, includes inverter side filter inductance, filter capacitor, grid side filtered electrical
Sense；
The control system is the current double closed-loop control of power network current detection, inverter side current feedback.
Preferably, the inverter of the three phase active electric power filter is three-phase voltage-type inverter.
Preferably, the output filter of the three phase active electric power filter uses LCL type filter.
Preferably, grid side current detecting close-loop control mode directly controls grid current harmonic component.
Preferably, inverter side inductor current feedback is introduced in power network current closed-loop control, by sampling inverter side
Inductive current is added in current-order after proportional component.
Preferably, grid side current control includes harmonic current control loop and fundamental current control circuit；
The harmonic current control loop controls the harmonic component of power network current using multi-resonant controller, so that
Controlled electric current no error following harmonic wave instruction current；
The fundamental current control circuit controls the fundametal compoment of power network current using ratio resonant controller, makes
Electric current no error following fundamental wave instruction current must be controlled.
A kind of control method that the three phase active electric power filter to as described above based on LCL filtering is controlled,
Itself the following steps are included:
Step 1: carrying out inspection side to power network current, the control as harmonic controling circuit in grid side closed-loop current control
Object, control target are so that the harmonic current components of injection power grid are zero；Harmonic current instruction
Step 2: the phase of detection DC bus-bar voltage and power grid A phase voltage passes through dc-link capacitance voltage reference value
Its actual value detected is subtracted, the error amount of DC bus-bar voltage is obtained, obtains fundamental current amplitude by PI controller, then
Multiplied by the phase information that detection obtains, fundamental wave instruction current can be obtained；
Step 3: command signal of the fundamental wave instruction current as fundamental wave control loop；
Step 4: and then instruct to obtain the instruction current of compensation electric current plus fundamental current by harmonic current instruction；
Step 5: closed-loop control, electricity are carried out in conjunction with inverter side inductive current of the current-order to Active Power Filter-APF
Stream ring controller obtains modulating wave using ratio control mode.
(3) beneficial effect
The beneficial effects of the present invention are: the three phase active electric power filter and its control provided by the invention based on LCL filtering
Method processed has the advantage that
The present invention is based on the three phase active electric power filter control systems of LCL filtering, by acquiring power network current, direct current
Hold voltage, inverter side inductive current carries out control inverter and exports a complementary harmonic current, realizes filter function.
Control Method of Three-phase APF proposed by the present invention based on LCL filtering, by detecting power network current
The harmonic component of power network current directly control avoid existing for traditional load current detection method detection delay and
Amplitude phase offset；Compensation effect and real-time are controlled better than traditional load-side current detecting.
Further, point of harmonic current and fundamental current is realized by using multi-resonant controller and ratio resonant controller
Frequency independent control, while also achieving harmonic compensation and the mutually indepedent control of DC bus-bar voltage control.
Control Method of Three-phase APF proposed by the present invention based on LCL filtering, using power network current closed loop
Control, while the active damping control of inverter side inductor current feedback is added, automatic virtual blocks are introduced, inhibit LCL filter humorous
Shake spike, and compensation electric current is made to accurately track instruction current.
Detailed description of the invention
The three phase active electric power filter system entirety control block diagram that Fig. 1 is filtered based on LCL；
The single-phase LCL type Active Power Filter-APF control block diagram of Fig. 2；
Fig. 3 power network current Closed-loop Control Strategy system block diagram.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
The invention discloses a kind of three phase active electric power filters based on LCL filtering comprising three-phase inverter T1, it is defeated
Filter and control system out.Three-phase inverter T1For voltage source inverter, energy storage original part is DC capacitor Cdc；Output filtering
Device is LCL third-order filter, includes inverter side filter inductance L1, filter capacitor C, grid side filter inductance L2；Control system is
Power network current detection, the current double closed-loop control of inverter side current feedback.
The control method of this LCL type Active Power Filter-APF: close-loop control mode is detected directly to electricity by power network current
Net current harmonics component is controlled, and avoids the existing detection delay of traditional load current detection method and assignment phase is inclined
It moves；The resonance spikes that automatic virtual blocks inhibit LCL filter are introduced by inverter side current feedback；It is realized by controller design
The frequency dividing independent control of harmonic wave and fundamental wave, while realizing the independent control of harmonic compensation and DC bus-bar voltage.
Wherein, the inverter T1 of three phase active electric power filter is three-phase voltage-type inverter.Active Power Filter-APF
Output filtering uses LCL type filter.
Closed-loop control is detected using power network current, directly grid current harmonic component is controlled, is avoided traditional
The existing detection delay of load current detection method and assignment phase offset；Compensation effect and real-time are better than traditional load-side
Current detecting control
Inverter side inductor current feedback is introduced in power network current closed-loop control, by sampling inverter side inductive current
It is added in current-order after proportional component, realizes that capacitor parallel virtual resistance inhibits LCL filter to increase damping
Resonance spikes；
The power network current control of use includes harmonic current control loop and fundamental current control circuit.Harmonic current control
Circuit controls the harmonic component of power network current using multi-resonant controller, so that controlled electric current no error following harmonic wave instruction
Electric current；Fundamental current control circuit controls the fundametal component of power network current using ratio resonant controller, so that controlled
Electric current no error following fundamental wave instruction current.
In the present embodiment, a kind of three phase active electric power filter filtered to the above based on LCL is additionally provided
The control method controlled, comprising the following steps:
Step 1: carrying out inspection side to power network current, the control as harmonic controling circuit in grid side closed-loop current control
Object, control target are so that the harmonic current components of injection power grid are zero；Harmonic current instruction
Step 2: the phase of detection DC bus-bar voltage and power grid A phase voltage passes through dc-link capacitance voltage reference value
Its actual value detected is subtracted, the error amount of DC bus-bar voltage is obtained, obtains fundamental current amplitude by P I controller,
Multiplied by the phase information that detection obtains, fundamental wave instruction current can be obtained；
Step 3: command signal of the fundamental wave instruction current as fundamental wave control loop；
Step 4: and then instruct to obtain the instruction current of compensation electric current plus fundamental current by harmonic current instruction；
Step 5: closed-loop control, electricity are carried out in conjunction with inverter side inductive current of the current-order to Active Power Filter-APF
Stream ring controller obtains modulating wave using ratio control mode.
The present invention is based on the Control Method of Three-phase APF of LCL filtering to be suitable for and three-phase system and homogeneous ststem
System, whole control block diagram is as shown in Figure 1, include LCL type three phase active electric power filter main circuit topology and current control
Part.It is realized in the digital processing unit using SP28335 as core the current control part.Now illustrate its tool for single-phase
Body controlling means.
Based on single-phase active electric-power filter control block diagram such as Fig. 2 of LCL filtering, by single-phase inverter T1, LCL filtering
Device, current-voltage sampling circuit and control circuit composition.Single-phase inverter T1DC side parallel DC capacitor Cdc, exchange side is
LCL filter, including inverter side inductance L1, filter capacitor C, net side inductance L2；Control system is sampled by power network current respectively
Circuit, network voltage sample rate current, phaselocked loop, DC capacitor voltage sample circuit, inverter side current sampling circuit and power grid,
DC capacitor CdcAnd single-phase inverter T1Output end connection.
Amplitude phase information, electric network voltage phase and the DC capacitor voltage for detecting power network current, pass through harmonic current
With the frequency dividing independent control of fundamental current, is controlled in conjunction with the active damping of inverter side current feedback, inverter is made to export one
Complementary harmonic current realizes the function of filtering out mains by harmonics.
As shown in figure 3, in control algolithm using multi-resonant control and ratio resonance control, respectively realize harmonic current and
The error of fundamental current tracks；Since fundamental current control device only generates control action to fundamental frequency signal, directly feed back inverse
Become the stability contorting that device side inductive current realizes DC capacitor voltage.
The technical principle of the invention is described above in combination with a specific embodiment, these descriptions are intended merely to explain of the invention
Principle shall not be construed in any way as a limitation of the scope of protection of the invention.Based on explaining herein, those skilled in the art
It can associate with other specific embodiments of the invention without creative labor, these modes fall within this hair
Within bright protection scope.
Claims (7)
1. a kind of three phase active electric power filter based on LCL filtering, it is characterised in that: including three-phase inverter, output filtering
Device and control system；
The three-phase inverter is voltage source inverter, and energy storage original part is DC capacitor；
The output filter is third-order filter, includes inverter side filter inductance, filter capacitor, grid side filter inductance；
The control system is the current double closed-loop control of power network current detection, inverter side current feedback.
2. the three phase active electric power filter according to claim 1 based on LCL filtering, which is characterized in that the three-phase
The inverter of Active Power Filter-APF is three-phase voltage-type inverter.
3. the three phase active electric power filter according to claim 1 based on LCL filtering, which is characterized in that the three-phase
The output filter of Active Power Filter-APF uses LCL type filter.
4. the three phase active electric power filter according to claim 1 based on LCL filtering, which is characterized in that grid side electricity
Stream detection close-loop control mode directly controls grid current harmonic component.
5. the three phase active electric power filter according to claim 1 based on LCL filtering, which is characterized in that in power grid electricity
It flows and introduces inverter side inductor current feedback in closed-loop control, be added after proportional component by sampling inverter side inductive current
In current-order.
6. the three phase active electric power filter according to claim 1 based on LCL filtering, which is characterized in that the electricity
Current on line side control includes harmonic current control loop and fundamental current control circuit；
The harmonic current control loop controls the harmonic component of power network current using multi-resonant controller, so that controlled
Electric current no error following harmonic wave instruction current；
The fundamental current control circuit controls the fundametal compoment of power network current using ratio resonant controller, so that by
Control electric current no error following fundamental wave instruction current.
7. a kind of control the three phase active electric power filter as claimed in any one of claims 1 to 6 based on LCL filtering
Control method, it is characterised in that: the following steps are included:
Step 1: carrying out inspection side to power network current, as the control object in harmonic controling circuit in grid side closed-loop current control,
Control target is so that the harmonic current components of injection power grid are zero；Harmonic current instruction
Step 2: the phase of detection DC bus-bar voltage and power grid A phase voltage is subtracted by dc-link capacitance voltage reference value
Its actual value detected obtains the error amount of DC bus-bar voltage, obtains fundamental current amplitude by PI controller, multiplied by
Obtained phase information is detected, fundamental wave instruction current can be obtained；
Step 3: command signal of the fundamental wave instruction current as fundamental wave control loop；
Step 4: and then instruct to obtain the instruction current of compensation electric current plus fundamental current by harmonic current instruction；
Step 5: closed-loop control, electric current loop are carried out in conjunction with inverter side inductive current of the current-order to Active Power Filter-APF
Controller obtains modulating wave using ratio control mode.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110572068A (en) * | 2019-08-26 | 2019-12-13 | 华中科技大学 | Current source access device with additional control signal |
| CN111917131A (en) * | 2020-08-04 | 2020-11-10 | 西安热工研究院有限公司 | Harmonic suppression method for photovoltaic LCL grid-connected inverter based on PI and MPR |
| CN113629984A (en) * | 2021-07-27 | 2021-11-09 | 浙江大学 | Three-phase LCL type SAPF parameter design method based on double-loop current control strategy |
| 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 |
| CN113839388A (en) * | 2021-11-29 | 2021-12-24 | 湖北工业大学 | Current double-loop control method of active power filter based on hybrid load |
| CN113890033A (en) * | 2021-10-26 | 2022-01-04 | 深圳市锐风电子科技有限公司 | Active damping circuit of active power filter and control method thereof |
| CN114024315A (en) * | 2021-11-12 | 2022-02-08 | 国网山东省电力公司德州供电公司 | Converter ripple current sharing control method and system based on virtual resistor |
| CN115453855A (en) * | 2022-09-05 | 2022-12-09 | 国网安徽省电力有限公司六安供电公司 | Design method of repetitive control compensator for LCL type APF |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110572068A (en) * | 2019-08-26 | 2019-12-13 | 华中科技大学 | Current source access device with additional control signal |
| CN110572068B (en) * | 2019-08-26 | 2020-12-08 | 华中科技大学 | Current source access device with additional control signal |
| CN111917131A (en) * | 2020-08-04 | 2020-11-10 | 西安热工研究院有限公司 | Harmonic suppression method for photovoltaic LCL grid-connected inverter based on PI and MPR |
| CN113629984A (en) * | 2021-07-27 | 2021-11-09 | 浙江大学 | Three-phase LCL type SAPF parameter design method based on double-loop current control strategy |
| CN113629984B (en) * | 2021-07-27 | 2023-02-28 | 浙江大学 | Three-phase LCL type SAPF parameter design method based on double-loop current control strategy |
| CN113890033A (en) * | 2021-10-26 | 2022-01-04 | 深圳市锐风电子科技有限公司 | Active damping circuit of active power filter and control method thereof |
| CN114024315A (en) * | 2021-11-12 | 2022-02-08 | 国网山东省电力公司德州供电公司 | Converter ripple current sharing control method and system based on virtual resistor |
| CN114024315B (en) * | 2021-11-12 | 2023-08-29 | 国网山东省电力公司德州供电公司 | Current transformer ripple current sharing control method and system based on virtual resistor |
| 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 |
| CN113839388A (en) * | 2021-11-29 | 2021-12-24 | 湖北工业大学 | Current double-loop control method of active power filter based on hybrid load |
| CN113839388B (en) * | 2021-11-29 | 2022-02-08 | 湖北工业大学 | Current double-loop control method of active power filter based on hybrid load |
| CN115453855A (en) * | 2022-09-05 | 2022-12-09 | 国网安徽省电力有限公司六安供电公司 | Design method of repetitive control compensator for LCL type APF |
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