CN108667043A - A kind of three-phase four-wire system APF modifieds vector resonance control method - Google Patents
A kind of three-phase four-wire system APF modifieds vector resonance control method Download PDFInfo
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- CN108667043A CN108667043A CN201810327119.8A CN201810327119A CN108667043A CN 108667043 A CN108667043 A CN 108667043A CN 201810327119 A CN201810327119 A CN 201810327119A CN 108667043 A CN108667043 A CN 108667043A
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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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Abstract
The present invention relates to a kind of three-phase four-wire system APF modifieds vector resonance control methods, and this method comprises the following steps：(1) real-time sampling DC bus-bar voltage, control DC bus-bar voltage keep constant to obtain the instruction of grid side current reference；(2) real-time sampling grid side electric current establishes modified resonance vector current controller, is input to modified resonance vector current controller and obtains three-phase four-wire system APF modulated signals the instruction of grid side current control and grid side practical measurement of current value；(3) modulated signal is modulated to obtain the switching signal of each switching tube in three-phase four-wire system APF, switching tube work is controlled according to switching signal.Compared with prior art, rapid dynamic response speed of the present invention, stability margin are high, calculation amount is small, strong antijamming capability.
Description
Technical field
The present invention relates to a kind of three-phase four-wire system APF control methods, more particularly, to a kind of three-phase four-wire system APF modifieds
Vector resonance control method.
Background technology
With the rapid development of power electronic technique, more and more power electronic equipments are widely applied to each neck
Domain, the nonlinear-loads such as rectifier, frequency converter, electric arc furnaces in power grid are continuously increased, non-linear, the impact of load
The problems such as serious transient state impact, reactive power, higher hamonic wave and three-phase imbalance being caused with disequilibrium to power grid.Electric power
The switching devices such as thyristor, diode in converter technique are widely applied generated harmonic current and idle electricity in power grid
Stream, instead of the harmonic wave and subharmonic current caused by traditional ferromagnetic material, also has become most important harmonic pollution source, makes
Phenomena such as distorting at voltage and current.To solve this kind of problem, the harmonics and reactive compensation device of the electric power transformedswitch
It comes into being.
Typical Representative of the Active Power Filter-APF (Active Power Filter, APF) as transformation of electrical energy technology be
A kind of novel advanced harmonic reactive compensating apparatus.It can not only compensate each harmonic, can also inhibit flickering, compensation nothing
Work(has the characteristics of a tractor serves several purposes.As a kind of novel electric power electric device, the working performance of APF be decided by main circuit structure and
Control system, it is determined that the main circuit of APF, control algolithm just become the key for determining output performance and efficiency.
For at present, the control method generally used mainly has following several classes：
(1) proportional integration (PI) control, one circle control and sluggish control：Online current spectrum, error and total humorous respectively
The aspect of wave distortion (THD) three is compared three kinds of control strategies, PI controls and one circle control to high frequency ac signal not
It can realize zero steady-state error.Sluggishness, which controls switching frequency with good performance but non-constant, can cause to contain in compensation electric current
There is higher hamonic wave, and increases the difficulty of filter design.
(2) selective harmonic compensation policy：All harmonic controllers are superimposed as a complete current controller.It should
Controller provides good selectivity to the entire control loop frequency response of resonance bandpass filter, but because harmonic wave is examined
The delay of survey can not ensure good dynamic response characteristic.
(3) control strategy with multiple simultaneous rotating coordinate system：Positive and negative sequence harmonic current is sat by each rotation self-synchronization
Mark transformation obtains DC component, realizes zero steady-state error compensation using PI controllers, but complicated calculating can occupy largely
Memory headroom.In addition, when three-phase four-wire system laod unbalance, which can not achieve the benefit to zero-sequence current
It repays.
(4) ratio resonance control (PRC) and vector scale integration control (VPI)：Modified control strategy, can be by right
The minimization of sensitivity function and peak value obtains high stability, avoids closed loop exception spike phenomenon.But such method without
Method solves the problems, such as three-phase imbalance and idle.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of three-phase four-wire system APF
Modified vector resonance control method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of three-phase four-wire system APF modifieds vector resonance control method, this method comprises the following steps：
(1) real-time sampling DC bus-bar voltage, control DC bus-bar voltage, which keeps constant to obtain grid side current reference, to be referred to
It enables；
(2) real-time sampling grid side electric current establishes modified resonance vector current controller, grid side current control is referred to
It enables and grid side practical measurement of current value is input to modified resonance vector current controller and obtains three-phase four-wire system APF modulated signals；
(3) modulated signal is modulated to obtain the switching signal of each switching tube in three-phase four-wire system APF, is believed according to switch
Number control switching tube work.
Step (1) is specially：
(11) DC bus-bar voltage outer shroud control ring is established：By the DC bus-bar voltage of sampling and the DC bus of setting
Reference voltage is input to voltage controller, and voltage controller exports the reference current of grid side d axis
(12) reference current of grid side q axis is setThe reference current of 0 axis of grid side
The voltage controller is PI controllers.
Step (2) is specially：
(21) grid side electric current is sampled, grid side d axis real-time currents i is obtained by Parker transformsd, grid side q axis it is real-time
Electric current isqWith 0 axis real-time current i of grid sides0；
(22) willWith isdMake it is poor,With isqMake it is poor,With is0Grid side current error signal is respectively obtained as difference；
(23) grid side current error signal is input to modified resonance vector current controller, establishes current inner loop control
Ring processed controls grid side current reference instruction trace grid side practical measurement of current value, obtains three-phase four-wire system APF modulated signals.
The transmission function of modified resonance vector current controller is：
Wherein, KPFor proportionality coefficient, KVRFor resonance coefficient, ωcFor damping factor, n is the overtone order for needing to adjust, n
ωoFor the resonant frequency point of corresponding points, R is three-phase four-wire system APF output equivalent resistance, and L is three-phase four-wire system APF output equivalents
Inductance, s are the complex variable in Laplace transform.
The current inner loop control ring is specially：
Grid side current control instructs and grid side practical measurement of current value is input to the control of modified resonance vector current as difference
Device, modified resonance vector current controller output end are sequentially connected the first controlling unit and the second controlling unit, and described
Two controlling units export three-phase four-wire system APF and compensate electric current, and three-phase four-wire system APF compensation electric currents are added to obtain electricity with load current
Current on line side measured value；
The first controlling unit transmission function is：
The second controlling unit transmission function is：
Wherein, KPWMFor the gain of pulsewidth modulation, TsFor signal sampling period, R is three-phase four-wire system APF output equivalent electricity
Resistance, L are three-phase four-wire system APF output equivalent inductance, and s is the complex variable in Laplace transform
Compared with prior art, the invention has the advantages that：
One, rapid dynamic response speed：Compared with existing control strategy, harmonic detecting link, link essence are not included
For a time delay process, this programme is not necessarily to Harmonic Detection device, directly can be detected and compensate to current on line side, has higher
Response speed.
Two, stability margin is high：Based on vector resonance control method, this method has frequency adaptability good and stability margin is big
Advantage, no harmonic detecting is so that this programme realizes higher dynamic responding speed in the case where ensureing stability margin.
Three, calculation amount is small：Directly using current on line side, DC bus-bar voltage as state variable, load current is as interference
Variable carries out small-signal analysis, and calculation amount is small, and can realize digitlization.
Four, strong antijamming capability：Power network current can be carried out directly sampling and controlling, remove harmonic detecting link from, it will
APF and load regard whole closed-loop control system as, and for other opposite schemes, program stability is good, strong antijamming capability.
Description of the drawings
Fig. 1 is three-phase four-wire system APF topological diagrams of the present invention；
Fig. 2 is the overall control block diagram of three-phase four-wire system APF modifieds vector resonance control method of the present invention；
Fig. 3 is the control block diagram of current inner loop control ring of the present invention.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.Note that the following embodiments and the accompanying drawings is said
Bright is substantial illustration, and the present invention is not intended to be applicable in it object or its purposes is defined, and the present invention does not limit
In the following embodiments and the accompanying drawings.
Embodiment
A kind of three-phase four-wire system APF modifieds vector resonance control method, this method comprises the following steps：
(1) real-time sampling DC bus-bar voltage, control DC bus-bar voltage, which keeps constant to obtain grid side current reference, to be referred to
It enables；
(2) real-time sampling grid side electric current establishes modified resonance vector current controller, grid side current control is referred to
It enables and grid side practical measurement of current value is input to modified resonance vector current controller and obtains three-phase four-wire system APF modulated signals；
(3) modulated signal is modulated to obtain the switching signal of each switching tube in three-phase four-wire system APF, is believed according to switch
Number control switching tube work.
Step (1) is specially：
(11) DC bus-bar voltage outer shroud control ring is established：By the DC bus-bar voltage of sampling and the DC bus of setting
Reference voltage is input to voltage controller, and voltage controller exports the reference current of grid side d axis
(12) reference current of grid side q axis is setThe reference current of 0 axis of grid side
Voltage controller is PI controllers.
Step (2) is specially：
(21) grid side electric current is sampled, grid side d axis real-time currents i is obtained by Parker transformsd, grid side q axis it is real-time
Electric current isqWith 0 axis real-time current i of grid sides0；
(22) willWith isdMake it is poor,With isqMake it is poor,With is0Grid side current error signal is respectively obtained as difference；
(23) grid side current error signal is input to modified resonance vector current controller, establishes current inner loop control
Ring processed controls grid side current reference instruction trace grid side practical measurement of current value, obtains three-phase four-wire system APF modulated signals.
The transmission function of modified resonance vector current controller is：
Wherein, KPFor proportionality coefficient, KVRFor resonance coefficient, ωcFor damping factor, n is the overtone order for needing to adjust, n
ωoFor the resonant frequency point of corresponding points, R is three-phase four-wire system APF output equivalent resistance, and L is three-phase four-wire system APF output equivalents
Inductance, s are the complex variable in Laplace transform.
Current inner loop control ring is specially：
Grid side current control instructs and grid side practical measurement of current value is input to the control of modified resonance vector current as difference
Device, modified resonance vector current controller output end are sequentially connected the first controlling unit and the second controlling unit, the second control
Link exports three-phase four-wire system APF and compensates electric current, and three-phase four-wire system APF compensation electric currents are added to obtain grid side electricity with load current
Flow measured value；
First controlling unit transmission function is：
Second controlling unit transmission function is：
Wherein, KPWMFor the gain of pulsewidth modulation, TsFor signal sampling period, R is three-phase four-wire system APF output equivalent electricity
Resistance, L are three-phase four-wire system APF output equivalent inductance, and s is the complex variable in Laplace transform.
Specifically, the present invention is by including following three parts：
1 topological structure and small-signal model
1.1 APF topological structures
As shown in Figure 1, the three-phase four-wire system APF with split capacitor structure can be equivalent to a voltage source inverter.
In order to inhibit zero-sequence current, the midpoint of DC capacitor C1 and C2 are connected to the neutral point of system.In Fig. 1, isiFor three phase network
Electric current, iciTo compensate electric current, iliFor load current, eiFor three-phase power grid voltage, νiFor inverter output voltage, diFor direct current
Hold duty ratio (i=a, b, c), vdc1, vdc2Respectively DC capacitor C1, C2Voltage.R is three-phase four-wire system APF output equivalent electricity
Resistance, L are three-phase four-wire system APF output equivalent inductance.
1.2 small-signal model
The mathematical model of traditional APF will usually compensate electric current as state variable.Here by current on line side isiAnd direct current
Busbar voltage VdcAs state variable, load current iliAs disturbance variable.The small-signal model of three-phase four-wire system APF is as follows：
In formulaThree phase network electric current, APF input offset electricity are indicated respectively
The exchange of switch function of stream, three-phase power grid voltage, switching device disturbs small signal；Dj(j=d, q, 0) switchs for switching device
The switch periods average value of function；VdcIndicate the fluctuation of DC voltage；It is DC bus capacitor C2On voltage microvariations letter
Number.
DC bus-bar voltage vdcThere are smaller fluctuation and larger inertia in stable state, therefore DC voltage can be had ignored
In,WithFormula (1) is through as follows obtained by Laplace transform：
2 anharmonic waves detect control strategy
Fig. 2 show the control block diagram of three-phase four-wire system APF, and control strategy is combined using outer voltage and current inner loop
Double-closed-loop control, the wherein control of outer voltage, that is, DC voltage, current inner loop be compensate electric current control.
In order to improve the stability of DC bus-bar voltage, using PI controllers, its output is the d axis under rotating coordinate system
Reference currentThat is total active component of load and APF.Total reactive component can pass through the reference current of setting q axisCome
It is adjusted.It, will in order to make power factor be 1It sets to 0.0 shaft currentSubstantially laod unbalance situation is reflected, equally to be set
It is set to 0.Power network current idq0Dq0 components can be obtained by the Parker transform under rotating coordinate system.Power network current and reference electricity
StreamInput of the error as current controller.And then to current control, its output progress reverse rotation coordinate transform obtains
To mabc, finally to modulated signal mabcThe conducting shutdown of IGBT is generated after being modulated.
3 current controllers design
3.1 PRC and VRC analyses
The transmission function difference of PRC and VRC is as follows：
In formula, KPR、KVRIt is the resonance coefficient of PRC and VRC respectively；KPIt is proportionality coefficient；ωcIt is bandwidth damping.
3.2 current controllers are analyzed
The influence for ignoring sampling and pwm signal delay, using ratio resonance control (PRC) and modified resonance vector controlled
(VRC) system open loop transmission function indicates as follows respectively：
Wherein, ω0=100 π rad/s, R=0.1 Ω, L=3mH, Kp=1, KPR=1000, KVR=5, ωc=5nrad/s
(n=6,12,18,24,30).Amplitude-versus-frequency curve shows by adjusting KPRAnd KVRSize, PRC and VRC can obtain compared with
High-gain.Phase-frequency characteristic curve shows that the resonant frequency of PRC and VRC has significant difference, and the stability margin of VRC is higher than PRC
Stability margin.
When inductance L or resistance R increase, PRC can have amplitude decaying and phase deviation at resonant frequency,
Decline so as to cause the runnability of APF.And VRC there are the problem of very little, shadow of the Parameters variation to system performance can be ignored
It rings.As it can be seen that VRC has stronger harmonic wave selectivity, good frequency adaptation ability and preferable stability margin.Therefore this hair
Bright to be used as current controller using VRC, Fig. 3 is the control block diagram of current inner loop control ring of the present invention, G in figureC(s) it is electric current
Controller, only with grid side d shaft currents i in figuresdControl for, q axis and 0 shaft current control with d shaft current control parameters
Unanimously.
The above embodiment is only to enumerate, and does not indicate that limiting the scope of the invention.These embodiments can also be with other
Various modes are implemented, and can make in the range of not departing from technical thought of the invention it is various omit, displacement, change.
Claims (6)
1. a kind of three-phase four-wire system APF modifieds vector resonance control method, which is characterized in that this method comprises the following steps：
(1) real-time sampling DC bus-bar voltage, control DC bus-bar voltage keep constant to obtain the instruction of grid side current reference；
(2) real-time sampling grid side electric current establishes modified resonance vector current controller, by grid side current control instruction and
Grid side practical measurement of current value is input to modified resonance vector current controller and obtains three-phase four-wire system APF modulated signals；
(3) modulated signal is modulated to obtain the switching signal of each switching tube in three-phase four-wire system APF, according to switching signal control
Switching tube work processed.
2. a kind of three-phase four-wire system APF modifieds vector resonance control method according to claim 1, which is characterized in that
Step (1) is specially：
(11) DC bus-bar voltage outer shroud control ring is established：The DC bus-bar voltage of sampling and the DC bus of setting are referred to
Control source to voltage controller, voltage controller exports the reference current of grid side d axis
(12) reference current of grid side q axis is setThe reference current of 0 axis of grid side。
3. a kind of three-phase four-wire system APF modifieds vector resonance control method according to claim 2, which is characterized in that
The voltage controller is PI controllers.
4. a kind of three-phase four-wire system APF modifieds vector resonance control method according to claim 2, which is characterized in that
Step (2) is specially：
(21) grid side electric current is sampled, grid side d axis real-time currents i is obtained by Parker transformsd, grid side q axis real-time currents
isqWith 0 axis real-time current i of grid sides0；
(22) willWith isdMake it is poor,With isqMake it is poor,With is0Grid side current error signal is respectively obtained as difference；
(23) grid side current error signal is input to modified resonance vector current controller, establishes current inner loop control
Ring controls grid side current reference instruction trace grid side practical measurement of current value, obtains three-phase four-wire system APF modulated signals.
5. a kind of three-phase four-wire system APF modifieds vector resonance control method according to claim 4, which is characterized in that
The transmission function of modified resonance vector current controller is：
Wherein, KPFor proportionality coefficient, KVRFor resonance coefficient, ωcFor damping factor, n is the overtone order for needing to adjust, n ωoFor
The resonant frequency point of corresponding points, wherein ωoFor 100 π.The fundamental wave of 50Hz is such as tracked, then n takes 1, at this time n ωo=100 π, i.e. resonance
Frequency is consistent with the frequency for the object to be tracked, it can be achieved that DAZ gene to tracking object.R is that three-phase four-wire system APF is defeated
Go out equivalent resistance, L is three-phase four-wire system APF output equivalent inductance, and s is the complex variable in Laplace transform.
6. a kind of three-phase four-wire system APF modifieds vector resonance control method according to claim 4, which is characterized in that
The current inner loop control ring is specially：
Grid side current control instructs and grid side practical measurement of current value is input to modified resonance vector current controller as difference, changes
It is sequentially connected the first controlling unit and the second controlling unit, the described second control into type resonance vector current controller output end
Link exports three-phase four-wire system APF and compensates electric current, and three-phase four-wire system APF compensation electric currents are added to obtain grid side electricity with load current
Flow measured value；
The first controlling unit transmission function is：
The second controlling unit transmission function is：
Wherein, KPWMFor the gain of pulsewidth modulation, TsFor signal sampling period, R is three-phase four-wire system APF output equivalent resistance, and L is
Three-phase four-wire system APF output equivalent inductance, s are the complex variable in Laplace transform.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865120A (en) * | 2020-12-28 | 2021-05-28 | 东北林业大学 | Novel P-VRC controller and parameter design method and application thereof |
| CN115579959A (en) * | 2022-11-23 | 2023-01-06 | 湖北工业大学 | Active control method and system for impedance adapter of multi-inverter grid-connected system |
-
2018
- 2018-04-12 CN CN201810327119.8A patent/CN108667043A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865120A (en) * | 2020-12-28 | 2021-05-28 | 东北林业大学 | Novel P-VRC controller and parameter design method and application thereof |
| CN115579959A (en) * | 2022-11-23 | 2023-01-06 | 湖北工业大学 | Active control method and system for impedance adapter of multi-inverter grid-connected system |
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Application publication date: 20181016 |