CN108494007A - Virtual synchronous generator control method based on direct Power Control when unbalanced source voltage - Google Patents
Virtual synchronous generator control method based on direct Power Control when unbalanced source voltage Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
Virtual synchronous generator control method based on direct Power Control when a kind of unbalanced source voltage obtains network voltage and grid-connected current positive-sequence component, inverter output instantaneous power and mean instantaneous power first with ROGI；Using mean instantaneous power as feedback quantity, the reference modulation signal under α β static coordinates is obtained using traditional virtual Strategy For Synchronization Control；Direct Power Control ring is established using vector scale integral resonance controller, using output instantaneous power as feedback quantity, by the way that different power command values is respectively set, obtains correcting modulated signal using direct Power Control；By reference modulation signal and modulated signal superposition is corrected, final modulated signal is obtained, is sent into SVPWM modulation modules, realizes that output current is sinusoidal and balance, output power are constant without two independent control targets of fluctuation respectively.Present invention preserves the original control characteristics of VSG, are not necessarily to phaselocked loop, improve system dynamic response capability, be easy to Project Realization.
Description
Technical field
The invention belongs to distributed generation technology fields, are related to virtual synchronous generator when a kind of unbalanced source voltage
Control method.
Background technology
Exploitation renewable new energy and raising renewable energy utilization efficiency are to solve the inevitable approach of mankind energy problem.
Regenerative resource needs to access power grid by electronic power convertor, to inject maximum power as target to power grid.Work as distribution
When capacity of installed generator is relatively low, original conventional synchronization generator can provide enough supports for electric system in system,
Distributed generation unit access will not threaten to the stability of electric system.Due to using electronic power convertor as interface
Distributed generation unit does not have inertia and the damping of synchronous generator, with the extensive access of distributed generation unit, passes
The installation ratio of system synchronous generator is gradually reduced, and causes spinning reserve capacity and rotary inertia in system are opposite to reduce, this
When electric system be easy influenced to cause system unstability by power swing and the system failure.As distribution type renewable energy oozes
The continuous improvement of saturating rate, distributed generation unit is threatened caused by stability of power system will be bigger.Virtual synchronous technology is real
The synchronous machine of electronic power convertor is showed so that distributed generation resource can have internal mechanism and the outside spy of synchronous machine
Property, so as to automatically participate in the adjusting of power grid as conventional synchronous machine.
Distributed generation unit is mounted on power grid end, and far from electrical power mains networks, power grid is fragile, at the same power grid environment compared with
For complexity, Voltage Harmonic content is high and electric network impedance is larger, and unbalanced source voltage failure easily occurs.These non-ideal electricity
Net environment will directly affect power quality and the stable operation of virtual synchronous generator, while also be made to power network safety operation
At negative effect.Therefore, operation mechanism and Optimal Control Strategy of the research virtual synchronous generator under non-ideal power grid environment,
To improving virtual synchronous generator survival ability, improves it and export power quality, the application for expanding virtual synchronous generator has
Most important theories are worth and realistic meaning.
Invention content
The purpose of the present invention be realize unbalanced source voltage when, grid-connected virtual synchronous generated output power without fluctuation,
Output current three-phase equilibrium and sinusoidal two independent control targets propose under a kind of two-phase static coordinate, are based on Direct Power control
The virtual synchronous generator control method of system.
The present invention is achieved by the following technical solutions.
Virtual synchronous generator control based on direct Power Control when a kind of unbalanced source voltage of the present invention
Method, which is characterized in that include the following steps：
(1) depression of order Generalized Integrator (Reduced Order Generalized Integrator, ROGI) is utilized to detach
Network voltage and grid-connected current positive-sequence component；Calculate instantaneous power, mean instantaneous power；
(2) mean instantaneous power is substituted into traditional virtual Strategy For Synchronization Control (Virtual Synchronous
Generator, VSG) obtain reference modulation signal；
(3) direct Power Control ring is established, power command value when by setting unbalanced source voltage, through Direct Power control
Amendment modulation when the accomplished output power of ring processed is without two fluctuation, output current sine and three-phase equilibrium different control targes
Signal；
(4) reference modulation signal and amendment modulated signal are overlapped, are sent into space vector pulse width modulation (Space
Vector Pulse Width Modulation, SVPWM) module, obtain the control signal of switching device.
Further, ROGI separation network voltages and grid-connected current positive-sequence component are utilized described in step (1) Calculating instantaneous power and the method for mean instantaneous power are：
(1-1) obtains voltage, electric current positive-sequence component, the expression formula such as formula (1) of discretization ROGI using ROGI after discretization
It is shown.
In formula, ω is angular frequency, TsFor sampling period, uα +For the voltage α axis positive-sequence components obtained after ROGI is handled,
uβ +For by ROGI treated voltage β axis positive-sequence components, eα +To be sent into the voltage α axis positive-sequence components of ROGI, eβ +To be sent into
The voltage β axis positive-sequence components of ROGI, subscript α, β indicate the static α β coordinates of two-phase under α, β component, subscript+expression positive-sequence component,
N samples for n-th.
(1-2) calculates instantaneous power Pg、Qg, mean instantaneous power P0、Q0, shown in calculation formula such as formula (2), (3).
In formula, eα、eβFor α, the beta -axis component of network voltage under the static α β coordinate systems of two-phase, iα、iβIt is sat for the static α β of two-phase
α, the beta -axis component of output current under mark system, subscript+expression positive-sequence component.
Further, it controls mean instantaneous power substitution tradition VSG to obtain the side of reference modulation signal described in step (2)
Method is：
Active power is instructed P by (2-1)refAnd mean instantaneous power P0Substitution formula (4) obtains voltage-phase.
In formula, J is virtual rotation inertia, DpFor damped coefficient, ω is angular frequency, ωnFor specified angular frequency, θ is phase
Angle.
Reactive power is instructed Q by (2-2)refAnd mean instantaneous power Q0Substitution formula (5) obtains voltage magnitude.
U=K ∫ (Qref-Q0)dt (5)
In formula, K is integral coefficient, and U is output voltage virtual value.
(2-3) regard the output of active link as frequency of modulated wave and phase, and idle link is exported as modulation wave amplitude,
According to formula (6) synthesis benchmark three-phase modulations voltage uam、ubm、ucm, two-phase static coordinate is obtained by Clarke (clark) transformation
Under reference modulation voltage uα、uβ, clark transformation for mula such as formula (7).
Further, direct Power Control ring is established described in step (3), power refers to when by setting unbalanced source voltage
Value is enabled, through the accomplished stable output power of direct Power Control ring, output current is sinusoidal and two differences of three-phase equilibrium control
Amendment modulated signal when target, the method for correcting modulated signal when obtaining unbalanced source voltage using direct Power Control
For：
(3-1) is established using vector scale integral (Vector Proportional Integral, VPI) resonant controller
Direct Power Control ring, shown in the expression formula such as formula (8) of VPI controllers.
In formula, Kp、KiFor two frequency multiplication VPI controller control parameters, ωcFor the bandwidth of VPI controls, ωnFor specified angular frequency
Rate.
(3-2) is when ensureing unbalanced source voltage, and the power command value of direct Power Control is arranged in stable output power
Pcom=0, Qcom=0, obtain the output result u ' of stable output power control targeα_com、u′β_com。
(3-3) is when ensureing unbalanced source voltage, and output current sine and three-phase equilibrium reset Direct Power control
Power command value P processedcom、Qcom, obtain the output result u ' of control targe when current sinusoidal and three-phase equilibriumα_com、u′β_com, real
Show current sinusoidal and power command value is arranged by formula (9) for three-phase equilibrium.
In formula, Pg、QgTo export instantaneous power, P0、Q0To export mean instantaneous power.
The output signal of direct Power Control is converted to amendment modulated signal, transfer equation by (3-4) by transition matrix M
As shown in formula (10), shown in M such as formulas (11).
In formula, uα_com、uβ_comFor the amendment modulated signal under α β coordinate systems, u 'α_com、u′β_comRespectively under α β coordinate systems
Direct Power Control output quantity, eα、eβFor α, the beta -axis component of network voltage under the static α β coordinate systems of two-phase, iα、iβFor two-phase
α, the beta -axis component of output current under static α β coordinate systems.
Further, being overlapped reference modulation signal and amendment modulated signal described in step (4), is sent into SVPWM tune
Molding block obtains the control signal of switching device.
The features of the present invention and advantageous effect：
(1) when unbalanced source voltage, using traditional virtual synchronous control technology, reference modulation signal is obtained；It establishes
Direct Power Control ring, the power command value of direct Power Control when by setting unbalanced source voltage, through Direct Power control
Amendment modulation letter when the accomplished stable output power of ring processed, output current three-phase equilibrium and sinusoidal two different control targes
Number；Reference modulation signal is superimposed with modulated signal is corrected, obtains final modulated signal.
(2) in unbalanced source voltage, the improvement virtual synchronous generator control method based on direct Power Control, no
Change VSG control structures, retain the original control characteristics of VSG, realized under two-phase stationary coordinate system, be not necessarily to phaselocked loop, improves
The dynamic response capability of system, is easy to Project Realization.
Description of the drawings
Attached drawing 1 is that VSG controls inverter entire block diagram.
2 system control process figure of attached drawing.
Attached drawing 3 is VSG control block diagrams.
Attached drawing 4 is direct Power Control block diagram.
Specific implementation mode
The present invention is described in detail with operation principle below in conjunction with the accompanying drawings.
As shown in Figure 1, in figure, UdcFor DC voltage, Rs、LsIt is respectively filter inductance internal resistance, filter inductance and filter with C
Wave capacitance；ia、ibAnd icFor inverter output current；ua、ubAnd ucThree-phase voltage is exported for inverter side；ea、ebAnd ecFor three-phase
Network voltage；LgFor line inductance；P*、Q*Respectively active and reactive power given value；Pg、QgFor inverter export instantaneous active,
Wattless power measurement value, P0、Q0Average instantaneous active, wattless power measurement value are exported for inverter.The present invention is in network voltage
The virtual synchronous generator control technology based on direct Power Control is given in unbalanced source voltage by power when uneven
Definite value and mean instantaneous power obtain the amplitude and phase of voltage by VSG control algolithms, and synthesis obtains reference modulation signal；
Direct Power Control ring is designed, in unbalanced source voltage, by the way that direct Power Control power command value is arranged, obtains difference
Amendment modulated signal；Reference modulation signal is superimposed with modulated signal is corrected, final modulated signal is obtained, is sent into SVPWM rings
Section obtains switching device control signal, and control targe is realized by controlling switching device break-make.
As shown in Fig. 2, the control method of the embodiment of the present invention includes the following steps：
1, sampling obtains inverter side output three-phase current iabcWith three-phase power grid voltage eabc,
2, the transmission function of discretization ROGI functions, ROGI continuous domains is：
In formula, k is for adjusting separating rate.
U is obtained according to formula (1)αβ +、uαβ -With uαβBetween continuous domain transmission function relationship be：
In formula, subscript α β indicate the component under the static α β coordinates of two-phase, subscript+expression positive-sequence component.
Formula (2) is simplified using the orthogonality relation of α β axis, by taking positive-sequence component as an example：
In formula, eαβ +For the input component of positive sequence ROGI, uαβ +For ROGI output components.
To formula (3) the right and left with s-j ω are multiplied by, can obtain：
Sliding-model control is carried out using Tustin bilinear transformations, Tustin is converted as shown in formula (5), TsFor sampling week
Phase.
It obtains shown in the ROGI expression formulas such as formula (6) after discretization.
In formula, ω is angular frequency, TsFor sampling period, uα +For the voltage α axis positive-sequence components obtained after ROGI is handled,
uβ +For by ROGI treated voltage β axis positive-sequence components, eα +To be sent into the voltage α axis positive-sequence components of ROGI, eβ +To be sent into
The voltage β axis positive-sequence components of ROGI, subscript α, β indicate the static α β coordinates of two-phase under α, β component, subscript+expression positive-sequence component,
N samples for n-th.
3, instantaneous power P is calculatedg、QgAnd mean instantaneous power Pg、Qg。
4, active power is instructed into PrefAnd mean instantaneous power P0Substitution formula is active-and frequency calculates link (7) and obtains virtually
Phase.
In formula, J is virtual rotation inertia, DpFor damped coefficient, ω is angular frequency, ωnFor specified angular frequency.
Active power is instructed into QrefAnd mean instantaneous power Q0Substitution formula is idle-voltage calculate link (8) obtain voltage amplitude
Value.
U=K ∫ (Qref-Q0)dt (8)
In formula, K is integral coefficient, and U is output voltage virtual value.
4, synthesis reference modulation voltage uam、ubmAnd ucm, and carry out clark and convert to obtain the benchmark under two-phase static coordinate
Modulation voltage uα、uβ。
5, direct Power Control is established, it is different when realizing unbalanced source voltage by the way that different power command values is arranged
Control targe.Specifically：To realize stable output power without fluctuation, P is arranged in power command valuecom、QcomIt is 0, is realizing electric current just
Power command value is arranged by formula (9) for string and three-phase equilibrium.Direct Power Control block diagram is as shown in Figure 4.
In formula, Pg、QgTo export instantaneous power, P0、Q0To export mean instantaneous power.
Mathematical model of the gird-connected inverter under α β coordinate systems is established by Fig. 1：
In formula, subscript α, β indicates the component under two-phase static coordinate；L=Lg+Ls, LsFor filter inductance internal resistance, LgFor
Line inductance；eα、eβFor α, the beta -axis component of network voltage under the static α β coordinate systems of two-phase, iα、iβFor the static α β coordinate systems of two-phase
Under output current α, beta -axis component.When unbalanced source voltage, network voltage can indicate under two-phase stationary coordinate system
For：
In formula, subscript+expression positive-sequence component, subscript-expression negative sequence component.
It can be obtained according to formula (10)：
It can be obtained according to formula (11)：
In formula, ωnThe specified angular frequency of power grid.
Exporting instantaneous power is：
To formula (14) derivation, can arrive power derivative is
Formula (12) (13) substitution (15) can be obtained under unbalanced power grid, output voltage expresses formula：
It can be obtained under unbalanced power grid, the equation of direct Power Control is：
In formula, M is transition matrix, and the output signal of direct Power Control is converted to amendment modulation by transition matrix M
Signal, Pcom、QcomRespectively active and reactive power command value, GVPIFor the expression formula of VPI controllers.
6, reference modulation signal is superimposed with modulated signal is corrected, is sent into SVPWM modulation link and obtains switching device control
Signal.
Claims (4)
1. the virtual synchronous generator control method based on direct Power Control, feature exist when a kind of unbalanced source voltage
In including the following steps：
(1) depression of order Generalized Integrator separation network voltage and grid-connected current positive-sequence component are utilized；It calculates instantaneous power, be averaged instantaneously
Power；
(2) mean instantaneous power substitution traditional virtual Strategy For Synchronization Control is obtained into reference modulation signal；
(3) direct Power Control ring is established, power command value when by setting unbalanced source voltage, through direct Power Control ring
Letter is modulated in amendment when accomplished output power is without two fluctuation, output current sine and three-phase equilibrium different control targes
Number；
(4) reference modulation signal and amendment modulated signal are overlapped, are sent into space vector pulse width modulation module, are switched
The control signal of device.
2. the virtual synchronous generator based on direct Power Control when a kind of unbalanced source voltage according to claim 1
Control method, it is characterised in that utilize depression of order Generalized Integrator separation network voltage and grid-connected current positive sequence described in step (1)
Component, the method for calculating instantaneous power and mean instantaneous power are：
(1-1) obtains voltage, electric current positive-sequence component, discretization depression of order Generalized Integrator using depression of order Generalized Integrator after discretization
Expression formula such as formula (1) shown in：
In formula, ω is angular frequency, TsFor sampling period, uα +For obtained voltage α axis is being just after the processing of depression of order Generalized Integrator
Order components, uβ +For by depression of order Generalized Integrator treated voltage β axis positive-sequence components, eα +To be sent into depression of order Generalized Integrator
Voltage α axis positive-sequence components, eβ +To be sent into the voltage β axis positive-sequence components of depression of order Generalized Integrator, subscript α, β indicates that two-phase is static
α, β component under α β coordinates, subscript+expression positive-sequence component, n sample for n-th；
(1-2) calculates instantaneous power Pg、Qg, mean instantaneous power P0、Q0, shown in calculation formula such as formula (2), (3)：
In formula, eα、eβFor α, the beta -axis component of network voltage under the static α β coordinate systems of two-phase, iα、iβFor under the static α β coordinate systems of two-phase
Output current α, beta -axis component, subscript+expression positive-sequence component.
3. the virtual synchronous generator based on direct Power Control when a kind of unbalanced source voltage according to claim 1
Control method, it is characterised in that controlling mean instantaneous power substitution traditional virtual Strategy For Synchronization Control described in step (2)
Method to reference modulation signal is：
Active power is instructed P by (2-1)refAnd mean instantaneous power P0Substitution formula (4) obtains voltage-phase：
In formula, J is virtual rotation inertia, DpFor damped coefficient, ω is angular frequency, ωnFor specified angular frequency, θ is phase angle；
Reactive power is instructed Q by (2-2)refAnd mean instantaneous power Q0Substitution formula (5) obtains voltage magnitude：
U=K ∫ (Qref-Q0)dt (5)
In formula, K is integral coefficient, and U is output voltage virtual value；
(2-3) regard the output of active link as frequency of modulated wave and phase, and idle link is exported and is used as modulation wave amplitude, according to
Formula (6) synthesizes benchmark three-phase modulations voltage uam、ubm、ucm, the reference modulation under two-phase static coordinate is obtained by Clarke transform
Voltage uα、uβ, clark transformation for mula such as formula (7)：
4. the virtual synchronous generator based on direct Power Control when a kind of unbalanced source voltage according to claim 1
Control method, it is characterised in that establish direct Power Control ring described in step (3), work(when by setting unbalanced source voltage
Rate command value, through the accomplished stable output power of direct Power Control ring, output current sine and two differences of three-phase equilibrium
Amendment modulated signal when control targe corrects the side of modulated signal when obtaining unbalanced source voltage using direct Power Control
Method is：
(3-1) establishes direct Power Control ring, the table of vector scale integral controller using vector scale integral resonance controller
Up to shown in formula such as formula (8)：
In formula, Kp、KiFor two frequency multiplication vector scale integral controller control parameters, ωcFor the bandwidth of vector scale integration control,
ωnFor specified angular frequency；
(3-2) is when ensureing unbalanced source voltage, and the power command value P of direct Power Control is arranged in stable output powercom
=0, Qcom=0, obtain the output result u ' of stable output power control targeα_com、u′β_com；
(3-3) is when ensureing unbalanced source voltage, and output current sine and three-phase equilibrium reset direct Power Control work(
Rate command value Pcom、Qcom, obtain the output result u ' of control targe when current sinusoidal and three-phase equilibriumα_com、u′β_com, realize electricity
Stream is sinusoidal and power command value is arranged by formula (9) for three-phase equilibrium：
In formula, Pg、QgTo export instantaneous power, P0、Q0To export mean instantaneous power；
The output signal of direct Power Control is converted to amendment modulated signal, transfer equation such as formula by (3-4) by transition matrix M
(10) shown in, shown in M such as formulas (11)：
In formula, uα_com、uβ_comFor the amendment modulated signal under α β coordinate systems, u 'α_com、u′β_comIt is respectively straight under α β coordinate systems
Meet power control output quantity, eα、eβFor α, the beta -axis component of network voltage under the static α β coordinate systems of two-phase, iα、iβFor the static α of two-phase
α, the beta -axis component of output current under β coordinate systems.
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| CN114709828B (en) * | 2022-05-05 | 2024-05-28 | 合肥学院 | New energy converter power filtering method based on VMD-moving average filtering |
| 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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