CN105006828B - A kind of grid-connected converter negative-sequence current compensation method - Google Patents
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Abstract
The invention discloses a kind of grid-connected converter negative-sequence current compensation method, by sampling grid-connected converter DC bus-bar voltage, square calculating, notch filter and a square root is carried out to the sampled value to calculate, filter out DC bus-bar voltage wave component, by the decoupling of dc bus alternating current-direct current active power, closed-loop control is carried out to grid-connected converter DC bus-bar voltage.On the one hand, when the present invention solves grid-connected converter implementation negative-sequence current compensation, dc bus exchanges the problem of active power fluctuation produces disturbance to DC bus-bar voltage, grid-connected current control, effectively improves the control accuracy of DC bus-bar voltage and the power quality of grid-connected current.On the other hand, the present invention realizes the accurate calculating of DC bus-bar voltage maximum fluctuation amplitude in negative-sequence current compensation process by the decoupling of grid-connected converter dc bus alternating current-direct current active power.
Description
Technical field
The present invention relates to the grid-connected converter negative-sequence current compensation policy based on the active decoupling of dc bus alternating current-direct current, belong to
Applied power electronics technical field.
Background technology
Due to electric network fault, asymmetrical three-phase load or the presence of power supply three-phase grid electric current asymmetry, load or electricity
Negative-sequence current is injected in source by electrical network access point to electric system, significantly affects the hree-phase symmetry of network voltage, even results in
Electric network fault it is further intensification.The negative-sequence current of specific electrical network access point can be detected by grid-connected converter, and is realized
Negative-sequence current compensates.But the instantaneous power exported due to the output of negative sequence compensation electric current, grid-connected converter is there are AC ripple,
So that grid-connected converter DC bus-bar voltage has pulsation, cause the closed-loop current control hydraulic performance decline of grid-connected converter or even control
System failure.
The negative-sequence current compensation of grid-connected converter at present, it is contemplated that the filter effect of dc-link capacitance, directly samples more
The DC bus-bar voltage of grid-connected converter carries out closed loop feedback control.On the one hand, such method causes dc power with exchanging work(
There are close coupling between rate control ring, cause grid-connected converter output current aberration rate high；On the other hand, grid-connected converter is difficult to
DC bus-bar voltage fluctuation amplitude is constrained, it is out of control to be also easy to produce system.
Under the premise of herein, pass through AC and DC power decoupled and voltage of the grid-connected converter in negative-sequence current compensation process
The k-factor correction of modulation, realizes model- following control and DC bus-bar voltage ripple of the DC bus-bar voltage DC component to command quantity
The controllable of amplitude is moved, for the power quality of lifting grid-connected converter output current, negative-sequence current compensation effect, dc bus electricity
Press control accuracy, grid-connected converter control stability and grid stability, equal significance.
The content of the invention
The present invention is directed to above-mentioned technical barrier, samples grid-connected converter DC bus-bar voltage instantaneous value, extracts dc bus
Feedback quantity of the voltage DC component as dc power control ring, by DC bus-bar voltage coefficient of variation to current control closed loop
Voltage output carry out k-factor correction；And pulse in DC bus-bar voltage allow amplitude to give, negative sequence compensation current amplitude and phase
Under conditions of position is given, the constraint computational methods of positive sequence active component instruction are provided.One aspect of the present invention realizes dc power
With the decoupling of AC power control, solve in negative-sequence current compensation process that DC bus-bar voltage control difficulty is big, current transformer is defeated
Go out the problem of current distortion rate is high；On the other hand breaching the reasonable given range of negative sequence compensation current-order amount is difficult to definite skill
Art problem.
In order to solve the above technical problems, the present invention provides a kind of grid-connected converter negative-sequence current compensation method, it is characterized in that：
Grid-connected converter DC bus-bar voltage is sampled, square calculating, notch filter and a square root meter are carried out to the sampled value
Calculate, DC bus-bar voltage wave component is filtered out, by the decoupling of dc bus alternating current-direct current active power, to grid-connected converter direct current
Busbar voltage carries out closed-loop control.
Comprise the following steps：
1) grid-connected converter DC bus-bar voltage is sampledIt is calculated through squareFiltered the signal as trap
Ripple device inputs, and filters out DC bus-bar voltage alternating component, and notch filter is exported progress square root is calculatedDirect current
Component
2) withAs DC bus-bar voltage command quantity, withAs dc bus active-power P I adjustment controls
Device GPI(s) feedback, obtains dc bus active power DC quantity by controller and instructs
3) electrical network negative phase-sequence voltage and negative sequence compensation instruction current phase difference are calculatedGiven negative sequence compensation current-order amplitudeObtain synchronous rotating frame negative phase-sequence d axis, q axis compensation current-order Calculate
Synchronous rotating frame positive sequence d shaft current command quantities
4) it is θ to make angle between positive sequence d axis and three phase static A axisp, angle is θ between negative phase-sequence d axis and three phase static A axisn,
Calculated by space vector, obtain instantaneous active power AC compounent Pac：
Pac=Pc2cos(θn-θp)+Ps2sin(θn-θp) (1)
IfWherein,With
The respectively instruction of synchronous rotating frame positive sequence d shaft currents, the instruction of positive sequence q shaft currents, negative phase-sequence d axis compensation current-order and negative phase-sequence
Q axis compensates current-order；WithThe respectively instruction of synchronous rotating frame positive sequence d shaft voltages, positive sequence q
Shaft voltage instruction, the instruction of negative phase-sequence d shaft voltages and the instruction of negative phase-sequence q shaft voltages；
Fluctuation maximum amplitude is allowed according to given current transformer DC bus-bar voltageAnd formula (1)
：
WillWithBring formula (2) into, obtain positive sequence active component
The constraints of compensation is：
5) it is I to make current transformer grid-connected current maximum amplitude in synchronization dq rotating coordinate systemsN_dq, solved not according to capacity limit
Equation equationObtainNumerical intervals beWherein N is just
Rational or irrational number；
6) according to formula (3), positive sequence q shaft current command quantities in synchronous rotating frame are asked forNumerical intervals, by output
Maximum inductive is idle or the principle of the minimum inductive reactive power of consumption determines the command quantity；
7) positive-negative sequence current governing equation is provided by formula (4), formula (5) under synchronous rotating frame：
In formula：
In formula, u represents voltage, and Δ u represents electric voltage feed forward item, in its subscript " ' " to represent the voltage be voltage control item,
" con " represents current transformer output valve in its subscript, and d, q in its subscript represent synchronous rotating frame d axis, synchronous rotary respectively
Coordinate system q axis, p, n in subscript represent positive-sequence component, negative sequence component respectively, and p, n in subscript represent that the component is located at respectively
Positive sequence synchronous rotating frame, negative phase-sequence synchronous rotating frame；R represents grid-connected line resistance, and L is represented
Grid-connected line inductance；
8) according to formula (4), formula (5) analytical expression, the pi regulator G of each dq axis of positive-negative sequence is passed throughPI(s) closed loop control is carried out
System, obtains the control voltage of each dq axis of positive-negative sequenceWith
The calculating of voltage and feedforward term is controlled by each dq axis of positive-negative sequence, and be multiplied by DC bus-bar voltage coefficient of variation K into
Row correction, obtains the current transformer output voltage of each dq axis of positive-negative sequenceWith
By two-phase rotating coordinate system-two-phase rest frame coordinate transform, current transformer positive-negative sequence output electricity is respectively obtained
The component being pressed in α, β rest frameWithWherein, subscript α, β represents the component respectively
Positioned at α, β rest frame；
Synthesized by α, β axis positive-negative sequence output voltage, obtain grid-connected converter output voltage space vector, and carry out pulsewidth
Modulation.
The transmission function of notch filter isWherein Q is quality factor, ω1For power grid electricity
The synchronous angular frequency of pressure.
In step 3),
Pass through formulaThe instruction of synchronous rotating frame positive sequence d shaft currents is calculated
Amount
In step 6), if being obtained according to formula (3)Numerical intervals expression formula isThen set positive sequence q axis
Current-order amount
If obtained according to formula (3)Numerical intervals expression formula isA, B for positive rational number or
Irrational number, then set positive sequence q shaft current command quantitiesAnd [- N, N] ∩
{ [- ∞, A] ∪ [B ,+∞] } for nonvoid set and.
The beneficial effect that the present invention is reached：
The present invention carries out the observation square calculating, a notch filter by sampling grid-connected converter DC bus-bar voltage
Calculate, filtered out due to DC bus-bar voltage wave component caused by the AC power that positive-negative sequence voltage and current produces with square root,
By the decoupling of dc bus alternating current-direct current active power, it is straight to realize the grid-connected converter based on dc bus DC component feedback
Flow busbar voltage closed-loop control.Since negative-sequence current compensation can cause DC bus-bar voltage to fluctuate, the present invention passes through dc bus
The ratio of voltage actual observation amount and DC component, obtains DC bus-bar voltage coefficient of variation K, and in grid-connected current controller
Connect, which significantly reduces disturbance of the DC bus-bar voltage fluctuation to grid-connected converter control.
On the one hand, when the present invention solves grid-connected converter implementation negative-sequence current compensation, dc bus exchange active power
The problem of fluctuation produces disturbance to DC bus-bar voltage, grid-connected current control, effectively improves the control essence of DC bus-bar voltage
The power quality of degree and grid-connected current.On the other hand, the present invention passes through grid-connected converter dc bus alternating current-direct current active power
Decoupling, realizes the accurate calculating of DC bus-bar voltage maximum fluctuation amplitude in negative-sequence current compensation process.The present invention is in negative phase-sequence
Compensation current amplitude phase gives, is calculated under conditions of the instruction of synchronous rotating frame positive sequence d shaft currents, is synchronous rotary
Coordinate system positive sequence active component (positive sequence q shaft currents) the definite of command quantity provides analytic method.
Brief description of the drawings
Fig. 1 grid-connected converter hardware topologies；
Fig. 2 synchronous rotating frame positive-negative sequence instruction current computational methods；
Fig. 3 is based on the voltage oriented grid-connected converter current control schematic diagram of positive-negative sequence.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiments are only used for clearly illustrating the present invention
Technical solution, and be not intended to limit the protection scope of the present invention and limit the scope of the invention.
1) grid-connected converter hardware topology is as shown in Figure 1.Make positive sequence q shaft voltages in synchronous rotating frameOrder
Negative phase-sequence q shaft voltages in synchronous rotating frameIn formula, subscript " g " represents grid side physical quantity, and " d " represents synchronous rotation
Turn coordinate system d axis, " q " represents synchronous rotating frame q axis, and " p " represents positive-sequence component, and " n " represents negative sequence component；Subscript " p "
Represent that the component is located at positive sequence synchronous rotating frame, subscript " n " represents that the component is located at negative phase-sequence synchronous rotating frame.
2) as shown in Fig. 2, sampling current transformer DC bus-bar voltage obtainsIt is calculated through squareBy the signal
Inputted as notch filter, filter out DC bus-bar voltage alternating component caused by exchanging active power due to dc bus, will
Notch filter output carries out square root and is calculatedDC componentWherein, notch filter transmission function
ForWherein Q is quality factor, ω1For network voltage synchronization angular frequency and ω1=100 π.With
As DC bus-bar voltage command quantity, withAs dc bus active-power P I adjustment control devices GPI(s) feedback,
Dc bus active power DC quantity is obtained by controller to instruct
3) by measurement and anti-phase calculating, electrical network negative phase-sequence voltage and negative sequence compensation instruction current phase difference are obtainedIt is given
Negative sequence compensation current-order amplitudeObtain synchronous rotating frame negative phase-sequence d, q axis compensation current-orderPass through formulaSynchronous rotary is calculated
Coordinate system positive sequence d shaft current command quantities
4) it is θ to make angle between positive sequence d axis and three phase static A axis (the static α axis of two-phase)p, negative phase-sequence d axis and three phase static A
Angle is θ between axis (the static α axis of two-phase)n, calculated by space vector, instantaneous active power AC compounent expression formula can be obtained
For：
Pac=Pc2cos(θn-θp)+Ps2sin(θn-θp) (1)
In formula：Pc2、Ps2The cosine and sinusoidal component amplitude of active power are respectively exchanged, Wherein,WithRespectively synchronous rotating frame positive sequence d shaft currents refer to
Make, positive sequence q shaft currents instruct, negative phase-sequence d axis compensation current-order and negative phase-sequence q axis compensate current-order；WithThe respectively instruction of synchronous rotating frame positive sequence d shaft voltages, the instruction of positive sequence q shaft voltages, the instruction of negative phase-sequence d shaft voltages and negative phase-sequence q
Shaft voltage instructs.If Udc、Udc_averageRespectively current transformer DC bus-bar voltage and DC component, in dc bus active power
Under conditions of DC component is controlled,Allow fluctuation maximum according to given current transformer DC bus-bar voltage
AmplitudeAnd formula (1) can obtain：
WillWithBring formula (2) into, the idle electricity of positive sequence can be obtained
Flowing the constraints compensated is：
5) according to known to step 3)With,Make current transformer grid-connected current in synchronization dq rotating coordinate systems maximum
Amplitude is IN_dq, inequation is solved according to capacity limitObtainNumerical value
Section isWherein N is positive rational number or irrational number.
6) according to formula (3), positive sequence q shaft current command quantities in synchronous rotating frame are asked forNumerical intervals, by output
Maximum inductive is idle or the principle of the minimum inductive reactive power of consumption determines the command quantity.According to linear equation in two unknowns disaggregation characteristic, if
Obtained according to formula (3)Numerical intervals expression formula isThen set positive sequence q shaft current command quantitiesIf
Obtained according to formula (3)Numerical intervals expression formula isA, B is positive rational number or irrational number, then sets
Determine positive sequence q shaft current command quantitiesAnd [- N, N] ∩ [- ∞, A] ∪ [B,
+ ∞] } for nonvoid set and.
7) positive-negative sequence current governing equation is provided by formula (4), formula (5) under synchronous rotating frame：
In formula：
In formula, u expression voltages, subscript " ' " represent the voltage for (the pi regulator output as shown in Figure 3 of voltage control item
), Δ u represents electric voltage feed forward item, and subscript " con " therein represents current transformer output valve,R represents figure
Grid-connected line resistance (R=R shown in 1a=Rb=Rc), L represents the grid-connected line inductance (L=L shown in Fig. 1a=Lb=Lc)。
8) according to formula (4), formula (5) analytical expression, the grid-connected change voltage oriented based on positive-negative sequence as shown in Figure 3 is obtained
Flow device current control principle.In figure,WithRespectively synchronous rotating frame positive sequence d shaft currents instruction,
The instruction of positive sequence q shaft currents, negative phase-sequence d axis compensation current-order and negative phase-sequence q axis compensation current-order；WithPoint
Wei not synchronous rotating frame positive sequence d shaft currents observation, positive sequence q shaft currents observation, negative phase-sequence d shaft currents observation and negative phase-sequence
Q shaft current observations.Pass through the pi regulator G of each dq axis of positive-negative sequencePI(s) closed-loop control is carried out, obtains each dq axis of positive-negative sequence
Control voltage WithThe algorithm calculations of voltage and feedforward term are controlled by each dq axis of positive-negative sequence, and are multiplied by
DC bus-bar voltage coefficient of variation K is corrected, and obtains the current transformer output voltage of each dq axis of positive-negative sequence WithBy two-phase rotating coordinate system-two-phase rest frame coordinate transform, it is defeated to respectively obtain current transformer positive-negative sequence
Go out component of the voltage in α, β rest frameWithWherein, subscript " α ", " β " difference table
Show that the component is located at α, β rest frame.Synthesized by α, β axis positive-negative sequence output voltage, obtain grid-connected converter output voltage
Space vector, and carry out pulsewidth modulation.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (4)
1. a kind of grid-connected converter negative-sequence current compensation method, it is characterized in that：
Grid-connected converter DC bus-bar voltage is sampled, square calculating, notch filter and a square root are carried out to the sampled value and is calculated, filter
Except DC bus-bar voltage wave component, by the decoupling of dc bus alternating current-direct current active power, to grid-connected converter dc bus
Voltage carries out closed-loop control；
Comprise the following steps：
1) grid-connected converter DC bus-bar voltage is sampledIt is calculated through squareUsing the signal as notch filter
Input, filters out DC bus-bar voltage alternating component, and notch filter is exported progress square root is calculatedDC component
2) withAs DC bus-bar voltage command quantity, withAs dc bus active-power P I adjustment control devices GPI
(s) feedback, obtains dc bus active power DC quantity by controller and instructs
3) electrical network negative phase-sequence voltage and negative sequence compensation instruction current phase difference are calculatedGiven negative sequence compensation current-order amplitudeObtain synchronous rotating frame negative phase-sequence d axis, q axis compensation current-order Calculate
Synchronous rotating frame positive sequence d shaft current command quantities
4) it is θ to make angle between positive sequence d axis and three phase static A axisp, angle is θ between negative phase-sequence d axis and three phase static A axisn, pass through
Space vector calculates, and obtains instantaneous active power AC compounent Pac：
Pac=Pc2cos(θn-θp)+Ps2sin(θn-θp) (1)
In formulaWherein, Pc2、Ps2Respectively exchange active
The cosine and sinusoidal component amplitude of power,WithRespectively synchronous rotating frame positive sequence d shaft currents refer to
Make, positive sequence q shaft currents instruct, negative phase-sequence d axis compensation current-order and negative phase-sequence q axis compensate current-order；WithThe respectively instruction of synchronous rotating frame positive sequence d shaft voltages, the instruction of positive sequence q shaft voltages, the instruction of negative phase-sequence d shaft voltages and negative phase-sequence q
Shaft voltage instructs；
Fluctuation maximum amplitude is allowed according to given current transformer DC bus-bar voltageAnd formula (1)：
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The principle of inductive reactive power or the minimum inductive reactive power of consumption determines the command quantity；
7) positive-negative sequence current governing equation is provided by formula (4), formula (5) under synchronous rotating frame：
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In formula, u represents voltage, and Δ u represents electric voltage feed forward item, in its subscript " ' " to represent the voltage be voltage control item, under it
" con " represents current transformer output valve in mark, and d, q in its subscript represent synchronous rotating frame d axis, synchronously rotating reference frame respectively
It is q axis, p, n in subscript represent positive-sequence component, negative sequence component respectively, and p, n in subscript represent that the component is located at positive sequence respectively
Synchronous rotating frame, negative phase-sequence synchronous rotating frame；R represents grid-connected line resistance, and L represents grid-connected
Line inductance；
8) according to formula (4), formula (5) analytical expression, the pi regulator G of each dq axis of positive-negative sequence is passed throughPI(s) closed-loop control is carried out,
Obtain the control voltage of each d, q axis of positive-negative sequenceWith
The calculating of voltage and feedforward term is controlled by each dq axis of positive-negative sequence, and is multiplied by DC bus-bar voltage coefficient of variation K and carries out school
Just, the current transformer output voltage of each dq axis of positive-negative sequence is obtainedWith
By two-phase rotating coordinate system-two-phase rest frame coordinate transform, respectively obtain current transformer positive-negative sequence output voltage and exist
Component in α, β rest frameWithWherein, subscript α, β represents that the component is located at respectively
α, β rest frame；
Synthesized by α, β axis positive-negative sequence output voltage, obtain grid-connected converter output voltage space vector, and carry out pulsewidth tune
System.
2. grid-connected converter negative-sequence current compensation method according to claim 1, it is characterized in that, the transmission of notch filter
Function isWherein Q is quality factor, ω1For network voltage synchronization angular frequency.
3. grid-connected converter negative-sequence current compensation method according to claim 1, it is characterized in that, in step 3),
Pass through formulaSynchronous rotating frame positive sequence d shaft current command quantities are calculated
4. grid-connected converter negative-sequence current compensation method according to claim 1, it is characterized in that, in step 6), if foundation
Formula (3) obtainsNumerical intervals expression formula isThen set positive sequence q shaft current command quantities
If obtained according to formula (3)Numerical intervals expression formula isA, B is positive rational number or unreasonable
Number, then set positive sequence q shaft current command quantitiesAnd [- N, N] ∩ [- ∞,
A] ∪ [B ,+∞] } it is nonempty set.
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