CN109167361A - A kind of new type of control method of LCL type parallel three phase Active Power Filter-APF - Google Patents
A kind of new type of control method of LCL type parallel three phase Active Power Filter-APF Download PDFInfo
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- CN109167361A CN109167361A CN201811208826.1A CN201811208826A CN109167361A CN 109167361 A CN109167361 A CN 109167361A CN 201811208826 A CN201811208826 A CN 201811208826A CN 109167361 A CN109167361 A CN 109167361A
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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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- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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 discloses a kind of new type of control method of LCL type parallel three phase Active Power Filter-APF, the system for constructing the Active Power Filter-APF of the LCL filtering of the curren tracing control method of an active damping optimal control method and novel broad sense integrator based on single net side inductor current feedback.High-pass filter is added in the feedback loop, selection is optimized to parameter, overcomes existing active damping method under fundamental wave domain to the adverse effect of system stability energy；Using two FIRST ORDER GENERALIZED DISTRIBUTED PARAMETER integrators that resonance frequency is identical, phase sequence is opposite, so that novel broad sense integrator is realized only has infinite gain in positive sequence or only at negative phase-sequence resonance frequency, so that novel broad sense integrator has the characteristic selectively compensated to the positive and negative sequential signal of identical frequency, and different gains can be distributed, reduce the complexity of control algolithm, improve operation efficiency, it solves the problems, such as harmonic compensation in the case of power grid and laod unbalance, improves the flexibility of compensation performance and application.
Description
Technical field
The present invention relates to parallel three phase Active Power Filter-APF technical field, in particular to a kind of LCL type parallel three phase has
The new type of control method of active power filter.
Background technique
With the extensive use of a large amount of power electronic equipments in the power system, harmonic distortion caused by nonlinear load
Problem is got worse.Harmonic wave control is more and more paid attention to by people.Compared with passive filter, Active Power Filter-APF
(Active Power Filter, APF) is good, small in size, flexible in application with filtering characteristic, is not easy to power grid generates resonance etc.
Feature becomes one of power network harmonic wave management effective means.
With the development of semiconductor technology, APF just develops towards the direction of large capacity, high power density.Grid-connected output filter
Wave device becomes one of the key factor for restricting large capacity APF development.Compared with traditional single inductance filter, LCL type filter energy
The inhibitory effect that more satisfactory switching harmonics are realized with lesser inductance, high-power applications occasion make APF system at
Originally it is substantially reduced, and significantly reduces the volume of device.
The tracking performance of compensation electric current is one of the important indicator of APF system performance.Harmonic current, which contains multiple high frequency, to be handed over
Signal is flowed, the randomness of load harmonic, realizes fast and accurately tracing control very much in addition.Currently, the compensating current control side of APF
Method specifically includes that Hysteresis control, track with zero error and PI control.Hysteresis control response is fast, does not have to carrier wave, is free of specific times
Harmonic wave, but stagnant loop bandwidth is not easy to be arranged, the switching frequency of power device is also not fixed；Track with zero error has dynamic response fast
The characteristics of, but, poor anti jamming capability strong to system parameter dependence；PI control is a kind of controlling party of widely applied maturation
Method can be realized no steady-state error for direct current signal and adjust, but high-frequency AC components this for the harmonic current of APF, with
Track is ineffective.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of Novel control sides of LCL type parallel three phase Active Power Filter-APF
Method, the following steps are included:
Step 1: establishing LCL type active power filter system；It is made of main circuit and control circuit:
Main circuit includes: voltage source inverter, output filter LCL and nonlinear load；The voltage source inverter
DC side is storage capacitor C；The output filter is by inverter side inductance L1, filter capacitor C0And net side inductance L2Composition；
The nonlinear load is that three-phase can not control rectifier band resistance inductive load；After voltage source inverter is connected with output filter
Access power grid in parallel with nonlinear load；
Control circuit includes harmonic current detection circuit, current follow-up control circuit, DC voltage detection circuit, locking phase
Loop circuit, current on line side detection circuit, driving circuit and DC capacitor voltage control device；Current on line side detection circuit is using single
Net side inductor current feedback, and single order high-pass filter is added in the feedback loop, current follow-up control circuit is connected, list is passed through
One Variable Control method optimizes selection to parameter；Current follow-up control circuit is used by multiple novel broad sense integrator unit groups
At selective harmonic compensating controller, only in positive sequence or only there is infinite gain at negative phase-sequence resonance frequency, to identical
The positive and negative sequential signal of frequency has the characteristic selectively compensated, and can distribute different gains, realizes in three-phase system
The independent decoupling control of positive and negative sequential signal；The FIRST ORDER GENERALIZED DISTRIBUTED PARAMETER integrator that two resonance frequency is identical, phase sequence is opposite, and increase resistance
Buddhist nun makes the unlimited gain at resonance frequency become adjustable amplitude gain, it is ensured that the steady track of APF at resonant frequency point
Performance；Current follow-up control circuit connection current on line side detection circuit, harmonic current detection circuit and driving circuit, it is described each
Novel broad sense integrator unit is made of two FIRST ORDER GENERALIZED DISTRIBUTED PARAMETER integrators that resonance frequency is identical, phase sequence is opposite, and resistance is added
Buddhist nun；
Step 2: detection load current is obtained according to instantaneous reactive power theory through instruction current computing circuit to be compensated
Instruction current；Instruction current is sent into current follow-up control circuit and generates driving signal, the sending of inverter is driven to compensate electric current；
Step 3: detection network voltage obtains voltage phase information through phase-locked loop circuit；Detect inverter DC capacitor electricity
Pressure, DC capacitor reference value and the error of the detected value are adjusted through PI, then are multiplied with phase information, obtain fundamental wave instruction current,
Inverter DC capacitor voltage is controlled；
Step 4: detection net side inductive current controls active damping；
Step 5: the parameter in the active damping optimal control method of single net side inductor current feedback is chosen.
A kind of new type of control method of LCL type parallel three phase Active Power Filter-APF according to claim 1, it is described
Parameter is chosen in step 5 method particularly includes:
The Closed-loop Transfer Function Model for establishing LCL filter list net side inductor current feedback, obtains
Equivalent transformation is carried out to the corresponding characteristic equation of transmission function to obtain
D (s)=L1L2C0s(s+Kωr)(s2+2ξωr+ωr),
To introduce an additional real pole；
The characteristic equation that the corresponding former characteristic equation of comparison transmission function and equivalent transformation obtain, according to same power coefficient phase
Deng Kg, ωgIt can be indicated with new parameter K and ξ:
WhereinωresFor the resonance frequency of LCL filter, ωrFor transformed resonance frequency；
According to Bode diagram it is found that as K=2 ξ, resonance peak inhibitory effect, system stability are best, thus KgAnd ωgAll may be used
It is indicated with ξ, multivariable is reduced to unitary variant as a result,；
The situation of change of stability margin when taking different value according to ξ chooses optimal ξ value, so that it is determined that KgAnd ωgIt is optimal
Value.
The utility model has the advantages that
The present invention using based on single net side inductor current feedback have former damping optimization control method to LCL resonance spikes into
Row inhibits, and compared to single electric current Proportional Feedback, this method increases low frequency range by the way that single order high-pass filter is added in feedback channel
Benefit generates inhibiting effect, to weaken influence of the active damping feedback to stability at low frequency, ensure that system under fundamental wave domain
Stability；Compared to the active damping method of traditional double-loop current control, this method only needs to sample net side inductive current,
The use for reducing sensor improves system reliability and reduces the cost of system；It is true compared to according only to stability criterion
Determine multivariable feedback parameter, this method is that unitary variant carries out parameter selection by changing multivariable, solves multivariable parameter choosing
Take difficult problem.
The present invention uses the curren tracing control method based on novel broad sense integrator, compared to traditional second order Generalized Product
Divide device that there is infinite gain, this method identical, phase sequence using two resonance frequencies simultaneously at positive sequence and negative phase-sequence resonance frequency
Opposite FIRST ORDER GENERALIZED DISTRIBUTED PARAMETER integrator only has infinite gain, to identical frequency in positive sequence or only at negative phase-sequence resonance frequency
Positive and negative sequential signal there is the characteristic that selectively compensates, realize the independent decoupling control of the positive and negative sequential signal in three-phase system and nothing
It need to be coordinately transformed.
The present invention uses the curren tracing control method based on novel broad sense integrator, is added in novel broad sense integrator
Damping term has unlimited gain compared to ideal FIRST ORDER GENERALIZED DISTRIBUTED PARAMETER integrator at resonance frequency, which integrates utensil
Have the adjustable characteristic of amplitude gain, so that it is guaranteed that at the Frequency point APF steady track performance.
The present invention uses the curren tracing control method based on novel broad sense integrator, reduces the complicated journey of control algolithm
Degree improves operation efficiency, and solves the problems, such as harmonic compensation in the case of power grid and laod unbalance, improves compensation performance and answers
Flexibility.
Detailed description of the invention
Fig. 1 is LCL type parallel three phase active power filter system block diagram.
Fig. 2 is novel broad sense integrator structure block diagram.
Fig. 3 is selective harmonic compensating controller structural block diagram.
Fig. 4 is active damping optimal control block diagram.
Specific embodiment
A kind of new type of control method of LCL type parallel three phase Active Power Filter-APF, the following steps are included:
Step 1: establishing LCL type active power filter system as shown in Figure 1；It is made of main circuit and control circuit:
Main circuit includes: voltage source inverter, output filter LCL and nonlinear load；The voltage source inverter
DC side is storage capacitor C；The output filter is by inverter side inductance L1, filter capacitor C0And net side inductance L2Composition；
The nonlinear load is that three-phase can not control rectifier band resistance inductive load；After voltage source inverter is connected with output filter
Access power grid in parallel with nonlinear load；
Control circuit includes harmonic current detection circuit, current follow-up control circuit, DC voltage detection circuit, locking phase
Loop circuit, current on line side detection circuit, driving circuit and DC capacitor voltage control device；Current on line side detection circuit is using single
Net side inductor current feedback, and single order high-pass filter is added in the feedback loop, current follow-up control circuit is connected, list is passed through
One Variable Control method optimizes selection to parameter；Current follow-up control circuit is used by multiple novel broad sense integrator unit groups
At selective harmonic compensating controller, only in positive sequence or only there is infinite gain at negative phase-sequence resonance frequency, to identical
The positive and negative sequential signal of frequency has the characteristic selectively compensated, and can distribute different gains, realizes in three-phase system
The independent decoupling control of positive and negative sequential signal；Increase damping term in novel broad sense integrator unit, so that the nothing at resonance frequency
Limit gain becomes adjustable amplitude gain, it is ensured that the steady track performance of APF at resonant frequency point；Current follow-up control circuit connects
Current on line side detection circuit, harmonic current detection circuit and driving circuit are connect, each novel broad sense integrator unit is by two
The FIRST ORDER GENERALIZED DISTRIBUTED PARAMETER integrator composition that a resonance frequency is identical, phase sequence is opposite, and damping term is added；
Nonlinear load harmonic electric current is detected by harmonics detection circuit, obtains harmonic wave instruction current to be compensatedIt is logical
It crosses power grid voltage detection circuit detection power grid A phase voltage and obtains A phase voltage phase information by phase-locked loop circuit；Pass through direct current
Hold voltage detecting circuit and detect DC capacitor voltage, passes through DC capacitor voltage control with the error of DC capacitor voltage reference value
Device processed obtains fundamental current amplitude；Fundamental current amplitude is multiplied to obtain fundamental current with power grid A phase voltage phase information；Pass through
Net side inductive current detection circuit detects net side inductive current, is sent into current follow-up control circuit, controls for active damping；It will
Obtained harmonic wave instruction current to be compensated and fundamental current is sent into current follow-up control circuit, theoretical for generating compensation electric current
Value ic'；Practical compensation electric current icSVPWM driving signal is generated through overdrive circuit, driving voltage type inverter generates practical compensation
Electric current ic
Step 2: detection load current is obtained according to instantaneous reactive power theory through instruction current computing circuit to be compensated
Instruction current；Instruction current is sent into current follow-up control circuit and generates driving signal, the sending of inverter is driven to compensate electric current.
It is applied in current follow-up control circuit based on novel broad sense integrator selective harmonic compensating controller, novel broad sense integrator
As shown in Fig. 2, selective harmonic compensating controller structure composes in parallel for multiple novel broad sense integrator units, in addition, in order to
When loading variation, good dynamic compensation performance is obtained, additional proportion controls gain in the controller, as shown in Figure 3.
Step 3: detection network voltage obtains voltage phase information through phase-locked loop circuit；Detect inverter DC capacitor electricity
Pressure, DC capacitor reference value and the error of the detected value are adjusted through PI, then are multiplied with phase information, obtain fundamental wave instruction current,
Inverter DC capacitor voltage is controlled；
Step 4: detection net side inductive current controls active damping；Active damping control block diagram is as shown in Figure 4；
Step 5: the parameter in the active damping optimal control method of single net side inductor current feedback is chosen.
A kind of new type of control method of LCL type parallel three phase Active Power Filter-APF, parameter in the step 5
It chooses method particularly includes:
The Closed-loop Transfer Function Model for establishing LCL filter list net side inductor current feedback, obtains
Equivalent transformation is carried out to the corresponding characteristic equation of transmission function to obtain
D (s)=L1L2C0s(s+Kωr)(s2+2ξωr+ωr),
To introduce an additional real pole；
The characteristic equation that the corresponding former characteristic equation of comparison transmission function and equivalent transformation obtain, according to same power coefficient phase
Deng Kg, ωgIt can be indicated with new parameter K and ξ:
WhereinωresFor the resonance frequency of LCL filter, ωrFor transformed resonance frequency；
According to Bode diagram it is found that as K=2 ξ, resonance peak inhibitory effect, system stability are best, thus KgAnd ωgAll may be used
It is indicated with ξ, multivariable is reduced to unitary variant as a result,；
The situation of change of stability margin when taking different value according to ξ chooses optimal ξ value, so that it is determined that KgAnd ωgIt is optimal
Value.
Claims (2)
1. a kind of new type of control method of LCL type parallel three phase Active Power Filter-APF, which comprises the following steps:
Step 1: LCL type active power filter system is established, is made of main circuit and control circuit:
Main circuit includes: voltage source inverter, output filter LCL and nonlinear load；The voltage source inverter direct current
Side is storage capacitor C；The output filter is by inverter side inductance L1, filter capacitor C0And net side inductance L2Composition；It is described
Nonlinear load is that three-phase can not control rectifier band resistance inductive load；Voltage source inverter connect with output filter after with it is non-
Linear load parallel connection accesses power grid；
Control circuit includes harmonic current detection circuit, current follow-up control circuit, DC voltage detection circuit, phaselocked loop electricity
Road, current on line side detection circuit, driving circuit and DC capacitor voltage control device；Current on line side detection circuit is using single net side
Inductor current feedback, and single order high-pass filter is added in the feedback loop, connect current follow-up control circuit；Current tracking control
Circuit processed uses the selective harmonic compensating controller being made of multiple novel broad sense integrator units, current follow-up control circuit
Connect current on line side detection circuit, harmonic current detection circuit and driving circuit, each novel broad sense integrator unit by
The FIRST ORDER GENERALIZED DISTRIBUTED PARAMETER integrator composition that two resonance frequency is identical, phase sequence is opposite, and damping term is added；
Step 2: detection load current obtains instruction to be compensated through instruction current computing circuit according to instantaneous reactive power theory
Electric current；Instruction current is sent into current follow-up control circuit and generates driving signal, driving inverter issues compensation electric current；
Step 3: detection network voltage obtains voltage phase information through phase-locked loop circuit；Inverter DC capacitor voltage is detected, directly
Galvanic electricity holds reference value and the error of the detected value is adjusted through PI, then is multiplied with phase information, fundamental wave instruction current is obtained, to inversion
Device DC capacitor voltage carries out stability contorting；
Step 4: detection net side inductive current controls active damping；
Step 5: the parameter in the active damping optimal control method of single net side inductor current feedback is chosen.
2. a kind of new type of control method of LCL type parallel three phase Active Power Filter-APF according to claim 1, feature
It is,
Parameter is chosen in the step 5 method particularly includes:
The Closed-loop Transfer Function Model for establishing LCL filter list net side inductor current feedback, obtains
Equivalent transformation is carried out to the corresponding characteristic equation of transmission function to obtain
D (s)=L1L2C0s(s+Kωr)(s2+2ξωr+ωr),
To introduce an additional real pole；
The characteristic equation that the corresponding former characteristic equation of comparison transmission function and equivalent transformation obtain, it is equal according to same power coefficient,
Kg, ωgIt can be indicated with new parameter K and ξ:
WhereinωresFor the resonance frequency of LCL filter, ωrFor transformed resonance frequency；
According to Bode diagram it is found that as K=2 ξ, resonance peak inhibitory effect, system stability are best, thus KgAnd ωgξ can all be used
It indicates, multivariable is reduced to unitary variant as a result,；
The situation of change of stability margin when taking different value according to ξ chooses optimal ξ value, so that it is determined that KgAnd ωgOptimal value.
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Cited By (17)
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| CN110098752A (en) * | 2019-05-30 | 2019-08-06 | 中南民族大学 | The rectified three-phase circuit and its control method of fast and stable unbalanced power grid |
| CN110138243A (en) * | 2019-05-30 | 2019-08-16 | 中南民族大学 | Rectified three-phase circuit and its control method suitable for unbalanced power grid |
| CN110176770A (en) * | 2019-06-10 | 2019-08-27 | 上海电力学院 | The control method of MMC type Active Power Filter-APF when unbalanced source voltage |
| CN110266009A (en) * | 2019-07-05 | 2019-09-20 | 华中科技大学 | A kind of exchange micro-capacitance sensor higher hamonic wave active stabilization device and method |
| CN110266017A (en) * | 2019-05-23 | 2019-09-20 | 浙江工业大学 | A kind of LCL type Active Power Filter-APF admixture feedback automatic virtual blocks control method |
| CN110323748A (en) * | 2019-05-28 | 2019-10-11 | 西安航空职业技术学院 | A kind of current controller optimal control method of Active Power Filter-APF |
| CN112366711A (en) * | 2020-11-03 | 2021-02-12 | 国网吉林省电力有限公司电力科学研究院 | Method for improving electric energy quality of microgrid by adopting APF (active power filter) on basis of energy storage control |
| CN112398356A (en) * | 2020-10-30 | 2021-02-23 | 深圳市科华恒盛科技有限公司 | LCL resonance control method and device for switching power supply |
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| CN112701722A (en) * | 2020-12-21 | 2021-04-23 | 青岛鼎信通讯股份有限公司 | Active damping method for restraining grid-connected current dead zone harmonic of energy router |
| CN113300624A (en) * | 2021-06-28 | 2021-08-24 | 新疆希望电子有限公司 | Optimization method for equivalent output impedance of intermediate frequency inverter power supply |
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| CN113644654A (en) * | 2021-05-10 | 2021-11-12 | 闽南理工学院 | Active damping method based on LCL active filter network side current feedback |
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| 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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| CN110323748A (en) * | 2019-05-28 | 2019-10-11 | 西安航空职业技术学院 | A kind of current controller optimal control method of Active Power Filter-APF |
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| CN110138243B (en) * | 2019-05-30 | 2020-06-09 | 中南民族大学 | Three-phase rectification circuit suitable for unbalanced power grid and control method thereof |
| CN110098752A (en) * | 2019-05-30 | 2019-08-06 | 中南民族大学 | The rectified three-phase circuit and its control method of fast and stable unbalanced power grid |
| CN110176770A (en) * | 2019-06-10 | 2019-08-27 | 上海电力学院 | The control method of MMC type Active Power Filter-APF when unbalanced source voltage |
| CN110176770B (en) * | 2019-06-10 | 2022-12-27 | 上海电力学院 | Control method of MMC type active power filter during power grid voltage unbalance |
| CN110266009A (en) * | 2019-07-05 | 2019-09-20 | 华中科技大学 | A kind of exchange micro-capacitance sensor higher hamonic wave active stabilization device and method |
| CN112398356B (en) * | 2020-10-30 | 2021-11-09 | 深圳市科华恒盛科技有限公司 | LCL resonance control method and device for switching power supply |
| CN112398356A (en) * | 2020-10-30 | 2021-02-23 | 深圳市科华恒盛科技有限公司 | LCL resonance control method and device for switching power supply |
| CN112366711A (en) * | 2020-11-03 | 2021-02-12 | 国网吉林省电力有限公司电力科学研究院 | Method for improving electric energy quality of microgrid by adopting APF (active power filter) on basis of energy storage control |
| CN112671398A (en) * | 2020-12-08 | 2021-04-16 | 东北大学 | Non-sinusoidal periodic signal phase locking method and system |
| CN112701722A (en) * | 2020-12-21 | 2021-04-23 | 青岛鼎信通讯股份有限公司 | Active damping method for restraining grid-connected current dead zone harmonic of energy router |
| CN113644654A (en) * | 2021-05-10 | 2021-11-12 | 闽南理工学院 | Active damping method based on LCL active filter network side current feedback |
| CN113644654B (en) * | 2021-05-10 | 2023-10-17 | 闽南理工学院 | Active damping method based on LCL active filter network side current feedback |
| CN113328439A (en) * | 2021-05-31 | 2021-08-31 | 国网河南省电力公司经济技术研究院 | LCLLC parallel active filter and control method thereof |
| CN113300624A (en) * | 2021-06-28 | 2021-08-24 | 新疆希望电子有限公司 | Optimization method for equivalent output impedance of intermediate frequency inverter power supply |
| CN113507227A (en) * | 2021-07-13 | 2021-10-15 | 中车株洲电力机车研究所有限公司 | Rectifier and control method and control system thereof |
| CN113507227B (en) * | 2021-07-13 | 2022-07-12 | 中车株洲电力机车研究所有限公司 | Rectifier and control method and control system thereof |
| CN113659583A (en) * | 2021-09-01 | 2021-11-16 | 青岛鼎信通讯股份有限公司 | Parallel compensation method for low-voltage treatment device at tail end of low-voltage distribution network |
| 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 |
| CN115642599A (en) * | 2022-12-26 | 2023-01-24 | 浙江日风电气股份有限公司 | Harmonic current suppression method, control device and power generation system |
| CN115642599B (en) * | 2022-12-26 | 2023-03-31 | 浙江日风电气股份有限公司 | Harmonic current suppression method, control device and power generation system |
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