CN109742758A - A kind of APF compensation method based on Dyn11 transformer - Google Patents
A kind of APF compensation method based on Dyn11 transformer Download PDFInfo
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- CN109742758A CN109742758A CN201910008551.5A CN201910008551A CN109742758A CN 109742758 A CN109742758 A CN 109742758A CN 201910008551 A CN201910008551 A CN 201910008551A CN 109742758 A CN109742758 A CN 109742758A
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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]
Abstract
Present invention relates particularly to a kind of APF compensation method based on Dyn11 transformer include one using phaselocked loop to grid entry point voltage carry out locking phase obtain the phase angle information of high pressure side voltage.The phase angle information of two pairs of high voltage side current load currents and high pressure side voltage uses DFT algorithm to obtain the idle and harmonic component of Dyn11 step down side electric current to the idle and harmonic component and conversion to low-pressure side of current draw；The difference of three DC voltages exports △ i as the input of voltage control moduled, △ idAs the d axis component of dq coordinate system, instruction current is converted to by dq-abc coordinate.Instruction current and APF equipment output current subtraction are obtained difference by five；Difference is input to current control module, current control module is according to the difference of input by calculating output control amount.Control amount is inputted SVPWM module by six；SVPWM module output switch control signal is controlled to corresponding IGB.
Description
Technical field
The invention belongs to field of power electronics, and in particular to a kind of APF compensation method based on Dyn11 transformer.
Background technique
With the fast development of power electronic technique, various power electronic equipments and nonlinear load bring a large amount of humorous
Wave pollution problem, so that power grid quality is adversely affected, in order to solve the harmonic problem that power grid is got worse, can use has
Device of the active power filter (APF) as mains by harmonics dynamic compensation.In conventional use occasion, first have to load electricity
Stream and network voltage carry out detection by Harmonic Decomposition algorithm by load current harmonic wave and idle constituents extraction come out, then into
Row current follow-up control.To realize accurate harmonic compensation, top priority is to obtain accurate sampled value.It common are source electricity
The electrical quantity of force filter (APF) sampling mainly has: network voltage, load current, compensation electric current, the APF of APF at grid-connected place are straight
Flow side voltage.And for some special occasions, it is such as introduced into the electric system of Dyn11 transformer, the grid entry point of APF equipment must be selected
It selects in low-pressure side, and low-pressure side is unable to measure to obtain load current, the load current sampled can only be on high-tension side load
The electrical quantity of current value, acquisition changes, and needs to be adjusted the method for harmonic detecting.In conclusion how basis
The working characteristics of Dyn11 transformer designs new harmonic detecting method, is that solution tradition in being introduced into Dyn11 transformer occasion is humorous
The key of Wave Decomposition no longer application.
Summary of the invention
1. technical problem to be solved:
The present invention provides a kind of harmonic detecting method based on Dyn11 transformer, solves after introducing Dyn11 transformer
Lead to the non-serviceable problem of conventional harmonic detection method since sampling quantity changes.
2. technical solution:
A kind of APF compensation method based on Dyn11 transformer, wherein load is connected to the high pressure side of Dyn11 transformer,
APF equipment is connected to Dyn11 transformer low voltage side；It is characterized by: APF equipment acquisition Dyn11 transformer high-voltage side is negative
Carry the DC side electricity of electric current, Dyn11 transformer low voltage side grid entry point voltage, the output electric current of APF equipment and APF equipment
Pressure.
Wherein, APF compensation method the following steps are included:
Step 1: locking phase is carried out to the grid entry point voltage that APF equipment acquires using phase-locked loop pll, obtains grid entry point voltage
Phase angle theta and sin θ and cos θ value；To calculate the value of sin (θ -30 °) and cos (θ -30 °)；The sin (θ -30 °) and
The value of cos (θ -30 °) is the phase angle information of Dyn11 transformer high-voltage side voltage.
Step 2: APF equipment acquires Dyn11 high voltage side of transformer current loading electric current ila、ilb、ilc；By the Dyn11
High voltage side of transformer current loading electric current ila、ilb、ilcWith the phase of Dyn11 transformer high-voltage side voltage obtained in step 1
Angle information, using DFT algorithm to ila、ilb、ilcHarmonic Decomposition is carried out, therein idle and harmonic component i is extractedha、ihb、ihc,
And by iha、ihb、ihcConversion to low-pressure side obtains the idle and harmonic component i of Dyn11 step down side electric currentha’、ihb’、
ihc’。
Step 3: by the DC voltage sampled value U of APF equipmentdcWith setting value Udc *It makes the difference to obtain difference △ Udc；By △
UdcInput as voltage control module；The output △ i of the voltage control moduledAs the d axis component of dq coordinate system, pass through
Dq-abc coordinate is converted to the active component i of instruction currentda、idb、idc。
Step 4: step 3 is obtained into the active component i of instruction currentda、idb、idcWith iha、ihb、ihcIt is separately summed to obtain
Instruction current irefa、irefb、irefc。
Step 5: by instruction current irefa、irefb、irefcElectric current i is exported with APF equipmentsa、isb、iscSubtract each other to obtain difference
△isa、△isb、△isc；By difference △ isa、△isb、△iscIt is input to current control module, current control module is according to input
△ isa、△isb、△iscControl amount U is exported by calculatingma、Umb、Umc。
Step 6: the control amount U that step 5 is obtainedma、Umb、UmcInput as SVPWM module；The output of SVPWM module
Corresponding switch control signal, and each switch control signal is transmitted to corresponding IGBT to control the work of each IGBT
State.
Further, the voltage control module is using PI controller.
Further, the current control module is using PI+PR controller.
Further, the APF equipment is parallel connection type APF equipment；The parallel connection type APF equipment is low in Dyn11 transformer
Press side grid-connected.
3. the utility model has the advantages that
The present invention can be avoided due to the excessive caused calculating error of Dyn11 transformer voltage ratio, use this method
Can using Dyn11 transformer occasion in, by APF equipment be mounted on low-pressure side on high-tension side idle and harmonic current into
Row effective compensation.
Detailed description of the invention
Connection and the sample mode that Fig. 1 is tradition APF；
Fig. 2 is the wiring of APF and sample mode in the occasion of the present invention using Dyn11 transformer；
Fig. 3 is the control block diagram of the harmonic compensation method provided by the invention based on Dyn11 transformer；
Fig. 4 is that the control of the voltage control module of the harmonic compensation method provided by the invention based on Dyn11 transformer is former
Manage block diagram；
Fig. 5 is that the control of the current control module of the harmonic compensation method provided by the invention based on Dyn11 transformer is former
Manage block diagram.
Specific embodiment
The present invention is specifically described with reference to the accompanying drawing.
Connection and the sample mode that attached drawing 1 is tradition APF；The electrical quantity of its sampling is mainly by loading as can be seen from Figure
Electric current, grid entry point voltage, equipment export electric current.As shown in Fig. 2, in the occasion for being introduced into Dyn11 transformer, parallel connection type
APF equipment need to be grid-connected in the progress of Dyn11 step down side, and the electrical quantity acquired will become Dyn11 high voltage side of transformer and bear
The DC voltage for carrying electric current, Dyn11 step down side grid entry point voltage, APF equipment output electric current and APF equipment, because
This control method should also be as being changed accordingly.
As shown in Fig. 3 wherein, APF compensation method the following steps are included:
Step 1: locking phase is carried out to the grid entry point voltage that APF equipment acquires using phase-locked loop pll, obtains grid entry point voltage
Phase angle theta and sin θ and cos θ value；To calculate the value of sin (θ -30 °) and cos (θ -30 °)；The sin (θ -30 °) and
The value of cos (θ -30 °) is the phase angle information of Dyn11 transformer high-voltage side voltage.
Step 2: APF equipment acquires Dyn11 high voltage side of transformer current loading electric current ila、ilb、ilc；By the Dyn11
High voltage side of transformer current loading electric current ila、ilb、ilcWith the phase of Dyn11 transformer high-voltage side voltage obtained in step 1
Angle information, using DFT algorithm to ila、ilb、ilcHarmonic Decomposition is carried out, therein idle and harmonic component i is extractedha、ihb、ihc,
And by iha、ihb、ihcConversion to low-pressure side obtains the idle and harmonic component i of Dyn11 step down side electric currentha’、ihb’、
ihc’。
Its detailed process are as follows:
Use Dyn11 high voltage side of transformer current loading electric current ila、ilb、ilcAnd high-pressure side phase angle information uses DFT algorithm
To ila、ilb、ilcHarmonic Decomposition is carried out, therein idle and harmonic component i is extractedha、ihb、ihc。
Due to iha、ihb、ihcFor the harmonic component of high voltage side current, is converted to low-pressure side and obtain iha’、ihb’、ihc', folding
Calculation process is shown in formula (1).
Step 3: by the DC voltage sampled value U of APF equipmentdcWith setting value Udc *It makes the difference to obtain difference △ Udc；By △
UdcInput as voltage control module；The output △ i of the voltage control moduledAs the d axis component of dq coordinate system, pass through
Dq-abc coordinate is converted to the active component i of instruction currentda、idb、idc。
Step 4: step 3 is obtained into the active component i of instruction currentda、idb、idcWith iha、ihb、ihcIt is separately summed to obtain
Instruction current irefa、irefb、irefc。
Step 5: by instruction current irefa、irefb、irefcElectric current i is exported with APF equipmentsa、isb、iscSubtract each other to obtain difference
△isa、△isb、△isc；By difference △ isa、△isb、△iscIt is input to current control module, current control module is according to input
△ isa、△isb、△iscControl amount U is exported by calculatingma、Umb、Umc。
Step 6: the control amount U that step 5 is obtainedma、Umb、UmcInput as SVPWM module；The output of SVPWM module
Corresponding switch control signal, and each switch control signal is transmitted to corresponding IGBT to control the work of each IGBT
State.
Further, the voltage control module is using PI controller.Attached drawing 4 is the voltage control used in the present invention
The control principle block diagram of molding block, by the DC voltage sampled value U of APF equipmentdcWith setting value Udc* it makes the difference to obtain difference △
Udc；△UdcAs the input of voltage control module, the output △ i of voltage control moduled, control used in voltage control module
Device is conventional PI controller, transmission function are as follows:
Wherein, Kp、KIRespectively ratio and integral constant.
Further, the current control module is using PI+PR controller.Instruction current irefa、irefb、irefcWith
Equipment exports electric current isa、isb、iscSubtract each other to obtain difference △ isa、△isb、△isc.Current control module is according to the △ i of inputsa、
△isb、△iscOutput control amount U is obtained by calculatingma、Umb、Umc.Current control module is in the base using routine PI controller
On plinth, increase resonant controller to control output control amount Uma、Umb、Umc, multiple resonant controllers and routine PI controller are simultaneously
Connection.The transmission function of PR controller are as follows:
Wherein KPAnd KRThe respectively proportionality coefficient and resonance coefficient of resonant controller, ω0For fundamental frequency, h is harmonic wave
Number.By increasing resonant controller in current control module, it had both been able to maintain resonance control effect in this way, has improved the steady of system
It is qualitative, and the compensation to specified subharmonic current may be implemented, it is required for different compensation to compensate and specify secondary harmonic current,
It controls flexible, adaptable.
Although the present invention has been described by way of example and in terms of the preferred embodiments, they be not it is for the purpose of limiting the invention, it is any ripe
This those skilled in the art is practised, without departing from the spirit and scope of the invention, can make various changes or retouch from working as, therefore guarantor of the invention
Shield range should be subject to what claims hereof protection scope was defined.
Claims (4)
1. a kind of APF compensation method based on Dyn11 transformer, wherein load is connected to the high pressure side of Dyn11 transformer,
APF equipment is connected to Dyn11 transformer low voltage side；It is characterized by: APF equipment acquisition Dyn11 transformer high-voltage side is negative
Carry the DC side electricity of electric current, Dyn11 transformer low voltage side grid entry point voltage, the output electric current of APF equipment and APF equipment
Pressure；
APF compensation method the following steps are included:
Step 1: locking phase is carried out to the grid entry point voltage that APF equipment acquires using phase-locked loop pll, obtains the phase of grid entry point voltage
Angle θ and sin θ and cos θ value；To calculate the value of sin (θ -30 °) and cos (θ -30 °)；The sin (θ -30 °) and cos
The value of (θ -30 °) is the phase angle information of Dyn11 transformer high-voltage side voltage；
Step 2: APF equipment acquires Dyn11 high voltage side of transformer current loading electric current ila、ilb、ilc；By the Dyn11 transformation
Device high voltage side current load current ila、ilb、ilcBelieve with the phase angle of Dyn11 transformer high-voltage side voltage obtained in step 1
Breath, using DFT algorithm to ila、ilb、ilcHarmonic Decomposition is carried out, therein idle and harmonic component i is extractedha、ihb、ihc, and will
iha、ihb、ihcConversion to low-pressure side obtains the idle and harmonic component i of Dyn11 step down side electric currentha’、ihb’、ihc'；
Step 3: by the DC voltage sampled value U of APF equipmentdcWith setting value Udc *It makes the difference to obtain difference △ Udc；By △ UdcMake
For the input of voltage control module；The output △ i of the voltage control moduledAs the d axis component of dq coordinate system, pass through dq-
Abc coordinate is converted to the active component i of instruction currentda、idb、idc；
Step 4: step 3 is obtained into the active component i of instruction currentda、idb、idcWith iha、ihb、ihcIt is separately summed and is instructed
Electric current irefa、irefb、irefc；
Step 5: by instruction current irefa、irefb、irefcElectric current i is exported with APF equipmentsa、isb、iscSubtract each other to obtain difference △ isa、
△isb、△isc；By difference △ isa、△isb、△iscIt is input to current control module, current control module is according to the △ of input
isa、△isb、△iscControl amount U is exported by calculatingma、Umb、Umc；
Step 6: the control amount U that step 5 is obtainedma、Umb、UmcInput as SVPWM module；The output of SVPWM module corresponds to
Switch control signal, and each switch control signal is transmitted to corresponding IGBT to control the work shape of each IGBT
State.
2. a kind of APF compensation method based on Dyn11 transformer according to claim 1, it is characterised in that: the voltage
Control module is using PI controller.
3. a kind of APF compensation method based on Dyn11 transformer according to claim 1, it is characterised in that: the electric current
Control module is using PI+PR controller.
4. a kind of APF compensation method based on Dyn11 transformer according to claim 1, it is characterised in that: the APF
Equipment is parallel connection type APF equipment；The parallel connection type APF equipment is grid-connected in Dyn11 transformer low voltage side.
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| CN201910008551.5A CN109742758B (en) | 2019-01-04 | 2019-01-04 | APF compensation method based on Dyn11 transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113013882A (en) * | 2019-12-19 | 2021-06-22 | 北京天诚同创电气有限公司 | Medium-voltage parallel active power filter and control method |
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