CN106451494B - A kind of active damping control method based on current on line side feedback - Google Patents
A kind of active damping control method based on current on line side feedback Download PDFInfo
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- CN106451494B CN106451494B CN201610908588.XA CN201610908588A CN106451494B CN 106451494 B CN106451494 B CN 106451494B CN 201610908588 A CN201610908588 A CN 201610908588A CN 106451494 B CN106451494 B CN 106451494B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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Abstract
The invention discloses a kind of active damping control methods based on current on line side feedback, comprising the following steps: 1) calculates net side current instruction value i under two-phase stationary coordinate systemsα_refAnd isβ_ref；Calculate the current on line side actual value i of three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate systemsαAnd isβ；2) the modulating wave initial order v of voltage source inverter is calculatedma0_ref、vmb0_refAnd vmc0_ref；3) it calculates active damping and controls signal vad_a、vad_bAnd vad_c；4) according to the modulating wave initial order v of voltage source inverterma0_ref、vmb0_refAnd vmc0_refAnd active damping controls signal vad_a、vad_bAnd vad_cObtain the modulating wave instruction value of voltage source inverter, each switching device in voltage source inverter is controlled further according to the modulating wave instruction value of voltage source inverter, this method is able to suppress LCL resonance, improves the reliability of three-phase alternating current potential source type grid-connected inverters system, and at low cost.
Description
Technical field
The invention belongs to automatically control and the research fields such as new energy power generation grid-connection system stability, it is related to a kind of based on net
The active damping control method of side current feedback.
Background technique
In recent years, it is got worse along with the problems such as fast development of China's economy, energy shortage and environmental pollution.In order to
It solves the above problems, has obtained large-scale development and utilization using wind-power electricity generation, photovoltaic power generation as the renewable energy of representative, thus
It is had been widely used so that generation of electricity by new energy is accessed grid-connected voltage source type inverter required for power grid.Voltage-source type is inverse
Becoming device mostly uses full-control type power electronic switching device cooperation PWM modulation strategy to work.It therefore, is raising grid entry point
Power quality reduces and switchs time ripple, and the filter between inverter and power grid is with regard to essential.With traditional L-type filter
It compares, LCL type filter can provide more outstanding switch time Ripple Suppression ability under volume and the comparable situation of capacity.
This feature makes it save cost and occupied area while ensureing grid entry point power quality, to obtain engineer application
Favor.However the resonance characteristic of LCL filter makes the design of the grid-connected inverter system of stable operation become more difficult
With complexity.
Recently, two classes can be mainly divided into the method for inhibiting LCL filter resonance both at home and abroad: passive damping and active resistance
Buddhist nun's control method.Wherein, the mode of passive damping is somebody's turn to do by the serial or parallel connection access passive resistance directly in filter network
Method realizes simple, high reliablity and robustness is stronger, however this method can generate additional loss, especially in high-power
The problem of occasion, which can also bring heat dissipation aspect.For active damping method, two classes can be divided into again: based on number filter
The active damping of wave and active damping based on state variable feedback, the active damping method based on digital filtering is by controlling
It is introduced directly into digital filter in loop processed to achieve the purpose that filter out LCL resonance peak, such method control structure is simple, and is not required to
Additional sensor.But designing the digital filter needs known system parameters, and damping to the variation of system parameter extremely
Sensitivity, therefore system stability is poor, the active damping method based on state variable feedback is by detection filter network
State variable forms active damping feedback loop, and this method does not generate excess loss and strong robustness, currently, being based on capacitance current
The active damping method of feedback is widely used because damping controller structure is simple, design method is mature.However, such is active
Damping method needs additional high-precision sensor to detect capacitance current, to reduce entire system while increasing cost
The reliability of system.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, a kind of having based on current on line side feedback is provided
Source damping control method, this method are able to suppress LCL resonance, improve the stabilization of three-phase alternating current potential source type grid-connected inverters system
Property, and it is at low cost.
In order to achieve the above objectives, the active damping control method of the present invention based on current on line side feedback includes following
Step:
1) three-phase alternating current potential source type grid-connected inverters system point of common coupling voltage v is detectedsa、vsbAnd vsc, according to three-phase
Alternating-current voltage source type grid-connected inverters system point of common coupling voltage vsa、vsbAnd vscCalculate net side electricity under two-phase stationary coordinate system
Flow instruction value isα_refAnd isβ_ref；The current on line side i of three-phase alternating current potential source type grid-connected inverters system is detected againsa、isbAnd
isc, further according to the current on line side i of three-phase alternating current potential source type grid-connected inverters systemsa、isbAnd iscCalculate two-phase stationary coordinate system
The current on line side actual value i of lower three-phase alternating current potential source type grid-connected inverters systemsαAnd isβ；
2) under the two-phase stationary coordinate system for obtaining step 1) three-phase alternating current potential source type grid-connected inverters system net side
Current instruction value isα_refAnd isβ_refRespectively with three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate system
Current on line side actual value isαAnd isβIt carries out making poor processing, and the result for making difference is input in ratio resonant regulator, ratio is humorous
The adjuster that shakes exports vcαAnd vcβ, ratio resonant regulator is exported into vcαAnd vcβIt is input in First-order Integral adjuster, further according to one
Rank integral controller export voltage source inverter modulating wave initial order vma0_ref、vmb0_refAnd vmc0_ref；
3) domain the s transmission function G of active damping controller is establishedad_sx(s), it then to the domain s of active damping controller transmits
Function Gad_sx(s) discretization is carried out, the current on line side of voltage source inverter under the two-phase stationary coordinate system that step 1) is obtained
Actual value isαAnd isβPass through the domain the s transmission function G of the active damping controller of discretizationad_sx(s) it is calculated, and will be calculated
As a result inverse Clark coordinate transform is carried out, active damping control signal v is obtainedad_a、vad_bAnd vad_c；
4) the modulating wave initial order v of the voltage source inverter obtained according to step 2)ma0_ref、vmb0_refAnd vmc0_ref
And the active damping control signal v that step 3) obtainsad_a、vad_bAnd vad_cThe modulating wave instruction value of voltage source inverter is obtained, so
Each switching device in voltage source inverter is controlled according to the modulating wave instruction value of voltage source inverter afterwards, is completed
Active damping control based on current on line side feedback.
The concrete operations of step 1) are as follows:
1.1) three-phase alternating current potential source type grid-connected inverters system point of common coupling voltage v is detectedsa、vsbAnd vsc, further according to
Three-phase alternating current potential source type grid-connected inverters system point of common coupling voltage vsa、vsbAnd vscCurrent electricity is obtained by phase-locked loop pll
The angular frequency of net0And phase theta；
1.2) according to the angular frequency of current electric grid0And phase theta calculates three-phase alternating current potential source type grid-connected inverters system
Three-phase current on line side instruction value isa_ref、isb_refAnd isc_ref；
1.3) the three-phase current on line side instruction for the three-phase alternating current potential source type grid-connected inverters system for obtaining step 1.2)
Value isa_ref、isb_refAnd isc_refIt carries out three-phase static coordinate system to convert to the Clark of two-phase stationary coordinate system, it is static to obtain two-phase
The current on line side instruction value i of three-phase alternating current potential source type grid-connected inverters system under coordinate systemsα_refAnd isβ_ref；
1.4) the current on line side i of three-phase alternating current potential source type grid-connected inverters system is detectedsa、isbAnd isc, and three are intersected
Flow the current on line side i of voltage-source type grid-connected inverters systemsa、isbAnd iscThree-phase static coordinate system is carried out to two-phase static coordinate
The Clark of system is converted, and the current on line side for obtaining three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate system is practical
Value isαAnd isβ。
The three-phase current on line side instruction value i of three-phase alternating current potential source type grid-connected inverters systemsa_ref、isb_refAnd isc_ref
Expression formula are as follows:
Wherein, Isa, Isb, IscThe respectively amplitude of three-phase current on line side instruction.
The transformation matrix T that the Clark of three-phase static coordinate system to two-phase stationary coordinate system is converted in step 1.3)abc-αβAre as follows:
The concrete operations of step 2) are as follows:
2.1) under the two-phase stationary coordinate system for obtaining step 1) three-phase alternating current potential source type grid-connected inverters system net
Side current instruction value is isα_refAnd isβ_refRespectively with three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate system
The current on line side actual value i of systemsαAnd isβIt carries out making poor processing, then the result for making difference processing is input to ratio resonant regulator,
Ratio resonant regulator exports vcαAnd vcβ；
2.2) the ratio resonant regulator for obtaining step 2.1) exports vcαAnd vcβIt is separately input to First-order Integral adjuster
In, and the output result of First-order Integral adjuster is subjected to two-phase stationary coordinate system and is become to the inverse Clark of three-phase static coordinate system
It changes, obtains the modulating wave initial order v of voltage source inverterma0_ref、vmb0_refAnd vmc0_ref。
The calculating process of First-order Integral adjuster in step 2.2) are as follows:
Wherein, KsFor integral coefficient, TsFor the sampling period of digitial controller, x (k) and y (k) are respectively First-order Integral tune
Input and output of the device k-th of sampling period are saved, x (k-1) and y (k-1) are respectively that First-order Integral adjuster is adopted at kth -1
The input and output in sample period.
The transformation matrix T that the inverse Clark of two-phase stationary coordinate system to three-phase static coordinate system is converted in step 2.2)αβ-abc
Are as follows:
The concrete operations of step 3) are as follows:
3.1) resonance of LCL filter is obtained according to the circuit electrical parameter of three-phase alternating current potential source type grid-connected inverters system
Angular frequencyres, wherein
Wherein, L1、L2And CfRespectively the inverter side inductance value of LCL filter, net side inductance value and filtering capacitance；
3.2) domain the s transmission function G of active damping controller is constructedad_sx(s), wherein
Wherein, ωcFor corner frequency, ωc=3 ωres, ζ is damped coefficient, ζ=104, RvFor virtual equivalent resistance:
3.3) by the domain the s transmission function G of active damping controllerad_sx(s) discretization is carried out, the active resistance of discretization is obtained
The domain the s transmission function G of Buddhist nun's controllerad_sx(s) way of realization in digitial controller are as follows:
y2(k)=Rv·x1(k)
y1(k)=y2(k)+y3(k)
Wherein, x1(k) and y1It (k) is respectively input and output of the active damping controller k-th of sampling period, y2(k)
And y3(k) be respectively k-th of sampling period intermediate variable；x1(k-1) and y3It (k-1) is respectively active damping controller
The input quantity and intermediate variable in k-1 sampling period, x1(k-2) and y3It (k-2) is respectively active damping controller at kth -2
The input quantity and intermediate variable in sampling period；
3.4) under the two-phase stationary coordinate system for obtaining step 1) three-phase alternating current potential source type grid-connected inverters system net
Side current actual value isαAnd isβIt is input in digitial controller, and passes through the active damping control of discretization in digitial controller
The domain the s transmission function G of device processedad_sx(s) it is calculated, and the result of calculating is subjected to two-phase stationary coordinate system and is sat to three phase static
The inverse Clark transformation of mark system obtains active damping control signal vad_a、vad_bAnd vad_c。
The concrete operations of step 4) are as follows:
4.1) the modulating wave initial order v for the voltage source inverter for obtaining step 1)ma0_ref、vmb0_refAnd vmc0_ref
The active damping control signal v that step 3) obtains is individually subtractedad_a、vad_bAnd vad_c, calculated result is respectively vma_ref、vmb_ref
And vmc_ref, then by vma_ref、vmb_refAnd vmc_refModulating wave instruction value as voltage source inverter；
4.2) the modulating wave instruction value for the voltage source inverter for obtaining step 4.1) carries out SPWM modulation, must modulate letter
Number, and by the amplified driving signal as switching device in voltage source inverter of the modulated signal, it realizes to voltage
The active damping fed back based on current on line side control is completed in the control of each switching device in the type inverter of source.
The invention has the following advantages:
Active damping control method of the present invention based on current on line side feedback first detects three-phase when specific operation
Alternating-current voltage source type grid-connected inverters system point of common coupling voltage and current on line side instruction value, then pass through ratio resonant regulator
And First-order Integral adjuster obtains the modulating wave initial order of voltage source inverter, wherein has by First-order Integral adjuster
The dynamic characteristic for imitating improvement system, resettles the domain the s transmission function of active damping controller, and feed back to obtain according to current on line side
Active damping controls signal, and the modulating wave initial order signal of active damping control signal and voltage source inverter is recycled to obtain
To the driving signal of corresponding switching device, the inhibition to LCL resonance is realized, to make three-phase alternating current potential source type grid-connected inverters
The work of system normal table.It should be noted that three-phase alternating current potential source type grid-connected inverters system point of common coupling voltage and
The detection of current on line side instruction value can be realized by sensor original in system, therefore cost is relatively low.
Detailed description of the invention
Fig. 1 is the grid-connected voltage source type inverter system main circuit schematic diagram that power grid is accessed by LCL filter；
Fig. 2 is gird-connected inverter traditional single phase current on line side control block diagram；
Fig. 3 is the current on line side control block diagram that the active damping fed back based on current on line side is added；
A phase network voltage and three-phase current on line side simulation waveform when Fig. 4 is without any damping；
Fig. 5 is a phase network voltage and three-phase current on line side simulation waveform after applying the present invention；
Fig. 6 is that a phase network voltage and three-phase current on line side dynamic response are imitative when being added without First-order Integral link in the present invention
True waveform diagram；
Fig. 7 is that First-order Integral link a phase network voltage and three-phase current on line side Dynamic Response Simulation wave are added in the present invention
Shape figure.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
It is of the present invention based on current on line side feedback active damping control method the following steps are included:
1) three-phase alternating current potential source type grid-connected inverters system point of common coupling voltage v is detectedsa、vsbAnd vsc, according to three-phase
Alternating-current voltage source type grid-connected inverters system point of common coupling voltage vsa、vsbAnd vscCalculate net side electricity under two-phase stationary coordinate system
Flow instruction value isα_refAnd isβ_ref；The current on line side i of three-phase alternating current potential source type grid-connected inverters system is detected againsa、isbAnd
isc, further according to the current on line side i of three-phase alternating current potential source type grid-connected inverters systemsa、isbAnd iscCalculate two-phase stationary coordinate system
The current on line side actual value i of lower three-phase alternating current potential source type grid-connected inverters systemsαAnd isβ；
2) under the two-phase stationary coordinate system for obtaining step 1) three-phase alternating current potential source type grid-connected inverters system net side
Current instruction value isα_refAnd isβ_refRespectively with three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate system
Current on line side actual value isαAnd isβIt carries out making poor processing, and the result for making difference is input in ratio resonant regulator, ratio is humorous
The adjuster that shakes exports vcαAnd vcβ, ratio resonant regulator is exported into vcαAnd vcβIt is input in First-order Integral adjuster, further according to one
Rank integral controller export voltage source inverter modulating wave initial order vma0_ref、vmb0_refAnd vmc0_ref；
3) domain the s transmission function G of active damping controller is establishedad_sx(s), it then to the domain s of active damping controller transmits
Function Gad_sx(s) discretization is carried out, the current on line side of voltage source inverter under the two-phase stationary coordinate system that step 1) is obtained
Actual value isαAnd isβPass through the domain the s transmission function G of the active damping controller of discretizationad_sx(s) it is calculated, and will be calculated
As a result inverse Clark coordinate transform is carried out, active damping control signal v is obtainedad_a、vad_bAnd vad_c；
4) the modulating wave initial order v of the voltage source inverter obtained according to step 2)ma0_ref、vmb0_refAnd vmc0_ref
And the active damping control signal v that step 3) obtainsad_a、vad_bAnd vad_cThe modulating wave instruction value of voltage source inverter is obtained, so
Each switching device in voltage source inverter is controlled according to the modulating wave instruction value of voltage source inverter afterwards, is completed
Active damping control based on current on line side feedback.
The concrete operations of step 1) are as follows:
1.1) three-phase alternating current potential source type grid-connected inverters system point of common coupling voltage v is detectedsa、vsbAnd vsc, further according to
Three-phase alternating current potential source type grid-connected inverters system point of common coupling voltage vsa、vsbAnd vscCurrent electricity is obtained by phase-locked loop pll
The angular frequency of net0And phase theta；
1.2) according to the angular frequency of current electric grid0And phase theta calculates three-phase alternating current potential source type grid-connected inverters system
Three-phase current on line side instruction value isa_ref、isb_refAnd isc_ref；
1.3) the three-phase current on line side instruction for the three-phase alternating current potential source type grid-connected inverters system for obtaining step 1.2)
Value isa_ref、isb_refAnd isc_refIt carries out three-phase static coordinate system to convert to the Clark of two-phase stationary coordinate system, it is static to obtain two-phase
The current on line side instruction value i of three-phase alternating current potential source type grid-connected inverters system under coordinate systemsα_refAnd isβ_ref；
1.4) the current on line side i of three-phase alternating current potential source type grid-connected inverters system is detectedsa、isbAnd isc, and three are intersected
Flow the current on line side i of voltage-source type grid-connected inverters systemsa、isbAnd iscThree-phase static coordinate system is carried out to two-phase static coordinate
The Clark of system is converted, and the current on line side for obtaining three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate system is practical
Value isαAnd isβ。
Wherein, the three-phase current on line side instruction value i of three-phase alternating current potential source type grid-connected inverters systemsa_ref、isb_refAnd
isc_refExpression formula are as follows:
Wherein, Isa, Isb, IscThe respectively amplitude of three-phase current on line side instruction.
The transformation matrix T that the Clark of three-phase static coordinate system to two-phase stationary coordinate system is converted in step 1.3)abc-αβAre as follows:
The concrete operations of step 2) are as follows:
2.1) under the two-phase stationary coordinate system for obtaining step 1) three-phase alternating current potential source type grid-connected inverters system net
Side current instruction value is isα_refAnd isβ_refRespectively with three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate system
The current on line side actual value i of systemsαAnd isβIt carries out making poor processing, then the result for making difference processing is input to ratio resonant regulator,
Ratio resonant regulator exports vcαAnd vcβ；
2.2) the ratio resonant regulator for obtaining step 2.1) exports vcαAnd vcβIt is separately input to First-order Integral adjuster
In, and the output result of First-order Integral adjuster is subjected to two-phase stationary coordinate system and is become to the inverse Clark of three-phase static coordinate system
It changes, obtains the modulating wave initial order v of voltage source inverterma0_ref、vmb0_refAnd vmc0_ref。
The calculating process of First-order Integral adjuster in step 2.2) are as follows:
Wherein, KsFor integral coefficient, TsFor the sampling period of digitial controller, x (k) and y (k) are respectively integral controller
In the input and output in k-th of sampling period, x (k-1) and y (k-1) are respectively First-order Integral adjuster in -1 sampling week of kth
The input and output of phase.
The transformation matrix T that the inverse Clark of two-phase stationary coordinate system to three-phase static coordinate system is converted in step 2.2)αβ-abc
Are as follows:
The concrete operations of step 3) are as follows:
3.1) resonance of LCL filter is obtained according to the circuit electrical parameter of three-phase alternating current potential source type grid-connected inverters system
Angular frequencyres, wherein
Wherein, L1、L2And CfRespectively the inverter side inductance value of LCL filter, net side inductance value and filtering capacitance；
3.2) domain the s transmission function G of active damping controller is constructedad_sx(s), wherein
Wherein, ωcFor corner frequency, ωc=3 ωres, ζ is damped coefficient, ζ=104, RvFor virtual equivalent resistance:
3.3) by the domain the s transmission function G of active damping controllerad_sx(s) discretization is carried out, the active resistance of discretization is obtained
The domain the s transmission function G of Buddhist nun's controllerad_sx(s) way of realization in digitial controller are as follows:
y2(k)=Rv·x1(k)
y1(k)=y2(k)+y3(k)
Wherein, x1(k) and y1It (k) is respectively input and output of the active damping controller k-th of sampling period, y2(k)
And y3(k) be respectively k-th of sampling period intermediate variable；x1(k-1) and y3It (k-1) is respectively active damping controller
The input quantity and intermediate variable in k-1 sampling period, x1(k-2) and y3It (k-2) is respectively active damping controller at kth -2
The input quantity and intermediate variable in sampling period；
3.4) under the two-phase stationary coordinate system for obtaining step 1) three-phase alternating current potential source type grid-connected inverters system net
Side current actual value isαAnd isβIt is input in digitial controller, and passes through the active damping control of discretization in digitial controller
The domain the s transmission function G of device processedad_sx(s) it is calculated, and the result of calculating is subjected to two-phase stationary coordinate system and is sat to three phase static
The inverse Clark transformation of mark system obtains active damping control signal vad_a、vad_bAnd vad_c。
The concrete operations of step 4) are as follows:
4.1) the modulating wave initial order v for the voltage source inverter for obtaining step 1)ma0_ref、vmb0_refAnd vmc0_ref
The active damping control signal v that step 3) obtains is individually subtractedad_a、vad_bAnd vad_c, calculated result is respectively vma_ref、vmb_ref
And vmc_ref, then by vma_ref、vmb_refAnd vmc_refModulating wave instruction value as voltage source inverter；
4.2) the modulating wave instruction value for the voltage source inverter for obtaining step 4.1) carries out SPWM modulation, must modulate letter
Number, and by the amplified driving signal as switching device in voltage source inverter of the modulated signal, it realizes to voltage
The active damping fed back based on current on line side control is completed in the control of each switching device in the type inverter of source.
Comparison diagram 4 and Fig. 5 are it is found that voltage source inverter operates in unstable state when any damping is not added；
Voltage source inverter can be with stable operation, comparison diagram 6 and Fig. 7 it is found that introducing First-order Integral device can be big after the present invention is added
It is big to improve system dynamic response characteristic；From fig. 6, it can be seen that whole system needs after Spline smoothing occurs for current on line side instruction
About 8 power frequency periods can just enter stable state；After First-order Integral device is added, whole system only needs about half power frequency period can be into
Enter stable state.
Claims (9)
1. a kind of active damping control method based on current on line side feedback, which comprises the following steps:
1) three-phase alternating current potential source type grid-connected inverters system point of common coupling voltage v is detectedsa、vsbAnd vsc, according to three-phase alternating current
Voltage source inverter grid-connected system point of common coupling voltage vsa、vsbAnd vscCurrent on line side under two-phase stationary coordinate system is calculated to refer to
Enable value isα_refAnd isβ_ref；The current on line side i of three-phase alternating current potential source type grid-connected inverters system is detected againsa、isbAnd isc, then
According to the current on line side i of three-phase alternating current potential source type grid-connected inverters systemsa、isbAnd iscIt calculates three under two-phase stationary coordinate system
The current on line side actual value i of phase alternating-current voltage source type grid-connected inverters systemsαAnd isβ；
2) under the two-phase stationary coordinate system for obtaining step 1) three-phase alternating current potential source type grid-connected inverters system current on line side
Instruction value isα_refAnd isβ_refRespectively with the net side of three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate system
Current actual value isαAnd isβIt carries out making poor processing, and the result for making difference is input in ratio resonant regulator, ratio resonance tune
It saves device and exports vcαAnd vcβ, ratio resonant regulator is exported into vcαAnd vcβIt is input in First-order Integral adjuster, further according to single order product
Point adjuster export voltage source inverter modulating wave initial order vma0_ref、vmb0_refAnd vmc0_ref；
3) domain the s transmission function G of active damping controller is establishedad_sx(s), then to the domain the s transmission function of active damping controller
Gad_sx(s) discretization is carried out, the current on line side of voltage source inverter is practical under the two-phase stationary coordinate system that step 1) is obtained
Value isαAnd isβPass through the domain the s transmission function G of the active damping controller of discretizationad_sx(s) it is calculated, and by calculated result
Inverse Clark coordinate transform is carried out, active damping control signal v is obtainedad_a、vad_bAnd vad_c；
4) the modulating wave initial order v of the voltage source inverter obtained according to step 2)ma0_ref、vmb0_refAnd vmc0_refAnd step
The rapid active damping control signal v 3) obtainedad_a、vad_bAnd vad_cThe modulating wave instruction value of voltage source inverter is obtained, then root
Each switching device in voltage source inverter is controlled according to the modulating wave instruction value of voltage source inverter, completes to be based on
The active damping control of current on line side feedback.
2. the active damping control method according to claim 1 based on current on line side feedback, which is characterized in that step 1)
Concrete operations are as follows:
1.1) three-phase alternating current potential source type grid-connected inverters system point of common coupling voltage v is detectedsa、vsbAnd vsc, further according to three-phase
Alternating-current voltage source type grid-connected inverters system point of common coupling voltage vsa、vsbAnd vscCurrent electric grid is obtained by phase-locked loop pll
Angular frequency0And phase theta；
1.2) according to the angular frequency of current electric grid0And phase theta calculates the three-phase of three-phase alternating current potential source type grid-connected inverters system
Current on line side instruction value isa_ref、isb_refAnd isc_ref；
1.3) the three-phase current on line side instruction value for the three-phase alternating current potential source type grid-connected inverters system for obtaining step 1.2)
isa_ref、isb_refAnd isc_refIt carries out three-phase static coordinate system to convert to the Clark of two-phase stationary coordinate system, obtains the static seat of two-phase
Mark is the current on line side instruction value i of lower three-phase alternating current potential source type grid-connected inverters systemsα_refAnd isβ_ref；
1.4) the current on line side i of three-phase alternating current potential source type grid-connected inverters system is detectedsa、isbAnd isc, and by three-phase alternating current
The current on line side i of potential source type grid-connected inverters systemsa、isbAnd iscThree-phase static coordinate system is carried out to two-phase stationary coordinate system
Clark transformation, obtains the current on line side actual value i of three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate systemsα
And isβ。
3. the active damping control method according to claim 2 based on current on line side feedback, which is characterized in that three intersections
Flow the three-phase current on line side instruction value i of voltage-source type grid-connected inverters systemsa_ref、isb_refAnd isc_refExpression formula are as follows:
Wherein, Isa, Isb, IscThe respectively amplitude of three-phase current on line side instruction.
4. the active damping control method according to claim 2 based on current on line side feedback, which is characterized in that step
1.3) the transformation matrix T that the Clark of three-phase static coordinate system to two-phase stationary coordinate system is converted inabc-αβAre as follows:
5. the active damping control method according to claim 1 based on current on line side feedback, which is characterized in that step 2)
Concrete operations are as follows:
2.1) net side of three-phase alternating current potential source type grid-connected inverters system is electric under the two-phase stationary coordinate system for obtaining step 1)
Stream instruction value is isα_refAnd isβ_refRespectively with three-phase alternating current potential source type grid-connected inverters system under two-phase stationary coordinate system
Current on line side actual value isαAnd isβIt carries out making poor processing, then the result for making difference processing is input to ratio resonant regulator, ratio
Resonant regulator exports vcαAnd vcβ；
2.2) the ratio resonant regulator for obtaining step 2.1) exports vcαAnd vcβIt is separately input in First-order Integral adjuster, and
The output result of First-order Integral adjuster is carried out two-phase stationary coordinate system to convert to the inverse Clark of three-phase static coordinate system, is obtained
The modulating wave initial order v of voltage source inverterma0_ref、vmb0_refAnd vmc0_ref。
6. the active damping control method according to claim 5 based on current on line side feedback, which is characterized in that step
2.2) calculating process of First-order Integral adjuster in are as follows:
Wherein, KsFor integral coefficient, TsFor the sampling period of digitial controller, x (k) and y (k) are respectively First-order Integral adjuster
In the input and output in k-th of sampling period, x (k-1) and y (k-1) are respectively First-order Integral adjuster in -1 sampling week of kth
The input and output of phase.
7. the active damping control method according to claim 5 based on current on line side feedback, which is characterized in that step
2.2) the transformation matrix T that the inverse Clark of two-phase stationary coordinate system to three-phase static coordinate system is converted inαβ-abcAre as follows:
8. the active damping control method according to claim 1 based on current on line side feedback, which is characterized in that step 3)
Concrete operations are as follows:
3.1) the resonance angular frequency of LCL filter is obtained according to the circuit electrical parameter of three-phase alternating current potential source type grid-connected inverters system
Rate ωres, wherein
Wherein, L1、L2And CfRespectively the inverter side inductance value of LCL filter, net side inductance value and filtering capacitance；
3.2) domain the s transmission function G of active damping controller is constructedad_sx(s), wherein
Wherein, ωcFor corner frequency, ωc=3 ωres, ζ is damped coefficient, ζ=104, RvFor virtual equivalent resistance:
3.3) by the domain the s transmission function G of active damping controllerad_sx(s) discretization is carried out, the active damping control of discretization is obtained
The domain the s transmission function G of device processedad_sx(s) way of realization in digitial controller are as follows:
y2(k)=Rv·x1(k)
y1(k)=y2(k)+y3(k)
Wherein, x1(k) and y1It (k) is respectively input and output of the active damping controller k-th of sampling period, y2(k) and y3
(k) be respectively k-th of sampling period intermediate variable；x1(k-1) and y3It (k-1) is respectively active damping controller at kth -1
The input quantity and intermediate variable in sampling period, x1(k-2) and y3It (k-2) is respectively active damping controller in -2 sampling weeks of kth
The input quantity and intermediate variable of phase；
3.4) net side of three-phase alternating current potential source type grid-connected inverters system is electric under the two-phase stationary coordinate system for obtaining step 1)
Flow actual value isαAnd isβIt is input in digitial controller, and passes through the active damping controller of discretization in digitial controller
The domain s transmission function Gad_sx(s) it is calculated, and the result of calculating is subjected to two-phase stationary coordinate system to three-phase static coordinate system
Inverse Clark transformation, obtain active damping control signal vad_a、vad_bAnd vad_c。
9. the active damping control method according to claim 1 based on current on line side feedback, which is characterized in that step 4)
Concrete operations are as follows:
4.1) the modulating wave initial order v for the voltage source inverter for obtaining step 1)ma0_ref、vmb0_refAnd vmc0_refRespectively
Subtract the active damping control signal v that step 3) obtainsad_a、vad_bAnd vad_c, calculated result is respectively vma_ref、vmb_refAnd
vmc_ref, then by vma_ref、vmb_refAnd vmc_refModulating wave instruction value as voltage source inverter；
4.2) the modulating wave instruction value for the voltage source inverter for obtaining step 4.1) carries out SPWM modulation, obtains modulated signal,
And by the amplified driving signal as switching device in voltage source inverter of the modulated signal, realize to voltage-source type
The active damping fed back based on current on line side control is completed in the control of each switching device in inverter.
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| CN104410072A (en) * | 2014-12-03 | 2015-03-11 | 天津天传新能源电气有限公司 | Active damping control method for grid-connected inverter |
| CN105610335A (en) * | 2015-12-31 | 2016-05-25 | 上海发电设备成套设计研究院 | Active damping control method of LCL grid-connected inverter under static coordinate |
| CN105827133A (en) * | 2016-05-11 | 2016-08-03 | 许继集团有限公司 | Distributed inverter resonance suppression method and system based on capacitor voltage prediction |
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| CN105610335A (en) * | 2015-12-31 | 2016-05-25 | 上海发电设备成套设计研究院 | Active damping control method of LCL grid-connected inverter under static coordinate |
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