CN107134806A - The decoupling current droop control method of shunt chopper in a kind of microgrid - Google Patents
The decoupling current droop control method of shunt chopper in a kind of microgrid Download PDFInfo
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- CN107134806A CN107134806A CN201710508658.7A CN201710508658A CN107134806A CN 107134806 A CN107134806 A CN 107134806A CN 201710508658 A CN201710508658 A CN 201710508658A CN 107134806 A CN107134806 A CN 107134806A
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Abstract
The invention discloses a kind of decoupling current droop control method of shunt chopper in microgrid, belong to the coordination control field of shunt chopper in microgrid.This method is different from traditional droop control, calculated without the power output to inverter, but by the way that current phasor is carried out into rotation transformation, so as to produce the virtual current vector with voltage vector same-phase, and then the sagging relation set up under synchronous rotating frame between voltage and virtual current.By reasonable design parameter, the control characteristic of sagging relation self-assembling formation virtual impedance can be made, compensation differs the decline of the current uniform effect caused due to line impedance.In addition, using the voltage phaselocked loop based on proportional controller, producing the reference value of electric voltage frequency, compared to traditional phaselocked loop based on proportional and integral controller, the phaselocked loop in this method can ensure that shunt chopper is run simultaneously with the identity of equality, keep redundancy.The present invention can realize that load current is accurately divided equally between inverter.
Description
Technical field
The invention belongs to the coordination control field of shunt chopper in microgrid, and in particular to shunt chopper in a kind of microgrid
Decoupling current droop control method.
Background technology
With the increasingly intensification of environment and energy crisis, the concept of microgrid has obtained increasing concern and application.It is micro-
Net is combined with the energy resource system of distributed power source and interconnection load.In most cases, microgrid passes through power electronics interface, example
Such as inverter, it is connected with bus.Therefore, the coordination control between shunt chopper is the key that microgrid realizes stable and high effective operation
One of factor.
Due to the dispersiveness on distributed power source geographical position, it is past between parallel connection power supply to transmit signal using connection
It is past and infeasible, because this can increase cost and reduce system reliability.In this case, the application of droop control can be with
Dividing equally for power between parallel connection power supply is realized on the premise of without using connection.
However, traditional droop control also bring along unstability caused by coupling between some defects, such as Power Control,
The intrinsic difference and frequency and the deviation of voltage magnitude of reactive power.In addition, traditional droop control is depended on to inverse
Become the calculating of device power output, it is necessary to carry out LPF to the instantaneous power calculated, to eliminate harmonic wave therein and noise,
The mean power of base correspondence ripple is obtained, the voltage and frequency reference of smooth steady is produced.But, the limited band of low pass filter
Width can drag slow system dynamic response, or even can cause the stability problem of whole system.
In order to solve the above problems, in recent years the droop control method for the purpose of transient current control rather than Power Control into
For study hotspot.There is document to propose to utilize connection share current, but although this method realizes the electricity between many inverters
Stream is divided equally, however, the use of connection adds cost also easily by noise jamming.Also document proposes to use current resonance
The method that device carrys out control electric current peak value, although this method can also realize accurate current uniform, this method needs reality
When adjust resonant controller resonant frequency, this causes the dynamic response of system not lifted.Also there is document utilization defeated in the recent period
The intrinsic sagging mechanism gone out between the direct-axis component and quadrature axis component of electric current and the amplitude and phase of voltage, proposes a kind of Novel electric
Flow down vertical control strategy, but this method requires that each inverter possesses similar hardware parameter and controller parameter design, it is actual
Feasibility is not strong.Also document is in synchronous rotating frame, and the sagging relation set up between voltage and electric current realizes electric current
Respectively, but the synchrone mechanism of this method is what the structure based on master ＆ slave control was set up, the redundancy of system operation can be reduced.
The content of the invention
In order to overcome the defect that above-mentioned prior art is present, the dynamic response and the stability of a system of droop control are improved, this
Invention provides a kind of decoupling current droop control method of shunt chopper in microgrid, and this method can realize that load current exists
Accurately divided equally between inverter.
The present invention is to be achieved through the following technical solutions：
The invention discloses a kind of decoupling current droop control method of shunt chopper in microgrid, comprise the following steps：
1) in an exchange microgrid, N platforms inverter in parallel is included, in order to improve the redundancy and reliability of system,
Every inverter is coequally controlled as voltage source with identical control strategy；
2) every inverter gathers electric capacity both end voltage phase information by voltage phaselocked loop, obtains the d-axis of voltage vector
Component and quadrature axis component, and produce the reference value of electric voltage frequency；
Wherein, adoption rate (P) adjuster in voltage phaselocked loop, the phaselocked loop based on ratio (P) adjuster coordinates electricity
Pressure adjuster can ensure frequency reference near fundamental frequency (50Hz) and make to keep synchronous between each inverter；
3) every inverter by electric current phaselocked loop gather electric current phase information, obtain current phasor direct-axis component and
Quadrature axis component；
4) according to step 2) and step 3) the middle voltage phase information and current phase information gathered, current phasor is revolved
Transformation is changed, and obtains virtual current vector, and the virtual current vector and voltage vector are equidirectional；
5) in synchronous rotating frame, by step 4) in virtual current vector and step 2) in voltage vector set up
Sagging relation is to reach the effect of share current, and the sagging relation is used for direct-axis component and the reference of quadrature axis component for producing voltage
Value, by the reference value input voltage and input current adjuster to generate PWM modulation signal.
Preferably, step 4) in virtual current include direct-axis component i'dWith quadrature axis component i'q, direct-axis component i'dAnd quadrature axis
Component i'qCalculated by following formula：
Wherein, δ is the phase angle difference of the output voltage and output current calculated by voltage x current phaselocked loop, idAnd iqPoint
It is not the direct-axis component and quadrature axis component of electric current under synchronous rotating frame.
Preferably, step 5) in set up sagging relation calculating formula it is as follows：
Wherein, vd *And vq *It is the direct-axis component and the reference value of quadrature axis component of voltage under synchronous rotating frame respectively；vd0
And vq0It is v respectivelyd *And vq *Rated value；M and n are defined as on the occasion of being the gain of droop control；i'dAnd i'qIt is synchronous rotation respectively
Turn the direct-axis component and quadrature axis component of virtual current under coordinate system；i'd0And i'q0It is i' respectivelydAnd i'qRated value.
It is further preferred that according to virtual current calculating formula and sagging relation calculating formula, obtaining control formula as follows：
Selection m and n is identical value, that is, regards as and introduce a virtual impedance connected with line impedance, and its value is：
Rv=mcos δ；
Wherein, RvAnd LvRespectively virtual resistance value and virtual inductor value；ωbaseIt is fundamental frequency.
Preferably, during design, sufficiently large m value is chosen, it is met：
And
Wherein, RlineAnd LlineIt is the resistance value and inductance value of transmission line impedance respectively, m, which meets the condition, makes virtual resistance
Anti- value is much larger than the value of line impedance, so that line impedance value can be ignored by contrast, each inverter can produce identical
Voltage reference value vd *And vq *As long as, therefore ensure that the control parameter of the sagging relational expression of voltage x current of each inverter is identical,
Accurate current uniform between shunt chopper can be realized.
Preferably, the adoption rate integral controller in electric current phaselocked loop.
Compared with prior art, the present invention has following beneficial technique effect：
The decoupling current droop control method of shunt chopper in microgrid disclosed by the invention, with traditional droop control not
Together, first, this method is calculated without the power output to inverter, but by the way that current phasor is carried out into rotation transformation,
So as to produce the virtual current vector with voltage vector same-phase, and then voltage is set up and virtual electric under synchronous rotating frame
Sagging relation between stream.Secondly, by reasonable design parameter, the control of sagging relation self-assembling formation virtual impedance can be made special
Property, compensation differs the decline of the current uniform effect caused due to line impedance.Finally, in this method using the ratio of being based on
The voltage phaselocked loop of adjuster, produces the reference value of electric voltage frequency, compared to traditional phaselocked loop based on proportional and integral controller,
Phaselocked loop in this method can ensure that shunt chopper is run simultaneously with the identity of equality, keep redundancy.Therefore, it is of the invention
Method is independent of the communication between inverter, compared to traditional droop control, this method possess more quick dynamic response and
The good stability of a system, and remain to realize the stream between shunt chopper in the case where line impedance is different, it is engineering
Using there is provided good reference value.
Brief description of the drawings
Fig. 1 is the overall control block diagram of control method proposed by the invention；
Fig. 2 is the decoupling graph of a relation under synchronous rotating frame between voltage vector and current phasor；
Fig. 3 is the emulation ripple of electric current direct-axis component, quadrature axis component and frequency under two kinds of control methods when the load
Shape figure；
Wherein, (a1), (a2), (a3) are respectively electric current direct-axis component under traditional droop control method, quadrature axis component
With the oscillogram of frequency；(b1), (b2), (b3) be respectively electric current direct-axis component under the control method proposed in the present invention,
The oscillogram of quadrature axis component and frequency；
Fig. 4 is electric current direct-axis component, quadrature axis component under two kinds of control methods when two inverters enter parallel connection
With the simulation waveform of frequency；
Wherein, (a1), (a2), (a3) are respectively electric current direct-axis component under traditional droop control method, quadrature axis component
With the oscillogram of frequency；(b1), (b2), (b3) be respectively electric current direct-axis component under the control method proposed in the present invention,
The oscillogram of quadrature axis component and frequency；
Fig. 5 be control method proposed by the present invention under, the experimental waveform figure of two shunt chopper power outputs；
Wherein, (a) is the oscillogram of active power of output；(b) it is the oscillogram of output reactive power；
Fig. 6 is under the control method that proposes in the present invention, the stable state electricity of two shunt choppers output before and after load change
Pressure and Current experiments oscillogram；
Wherein, (a) is the oscillogram before load change；(b) it is the oscillogram after load change.
Embodiment
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
Referring to Figures 1 and 2, the present invention proposes a kind of decoupling current droop control method of shunt chopper in microgrid,
Aim to solve the problem that the current uniform effect of traditional droop control inverter, dynamic response and system instability.
It is as follows that it implements step：
1) in an exchange microgrid, N platforms inverter in parallel is included, every inverter is according to the sagging control of identical electric current
System strategy, is controlled as voltage source.
2) every inverter gathers the phase information of electric capacity both end voltage by voltage phaselocked loop, obtains the straight of voltage vector
Axis component and quadrature axis component, and produce the reference value of electric voltage frequency；Adoption rate (P) adjuster in voltage phaselocked loop, to protect
Frequency reference is demonstrate,proved near fundamental frequency (50Hz) and makes to keep synchronous between each inverter.
3) every inverter by electric current phaselocked loop gather electric current phase information, obtain current phasor direct-axis component and
Quadrature axis component；Adoption rate integrates (PI) adjuster in electric current phaselocked loop.
4) according to step 2) with step 3) in collection voltage-phase and current phase, current phasor is done into rotation transformation,
Virtual current vector is obtained, virtual current vector and voltage vector are equidirectional, the direct-axis component i' of virtual currentdAnd quadrature axis component
i'q, calculated by following formula：
Wherein, δ is the phase angle difference of the output voltage and output current calculated by voltage x current phaselocked loop, idAnd iqPoint
It is not the direct-axis component and quadrature axis component of electric current under synchronous rotating frame.
5) in synchronous rotating frame, by step 4) in virtual current vector and voltage vector set up sagging relation,
The direct-axis component of voltage and the reference value of quadrature axis component are produced, to reach the effect of share current.The specific control of every inverter
Standard is as follows：
Wherein, vd *And vq *It is the direct-axis component of voltage and the reference value of quadrature axis component in synchronous rotating frame respectively；vd0
And vq0It is v respectivelyd *And vq *Rated value；M and n are defined as just, are the gains of droop control；i'dAnd i'qIt is synchronous rotary respectively
The direct-axis component and quadrature axis component of virtual current under coordinate system；i'd0And i'q0It is i' respectivelydAnd i'qRated value.
6) step 4 is combined) and step 5), complete control formula is as follows：
It is identical value that m and n is chosen in design, you can introduce a virtual resistance connected with line impedance to regard as
Anti-, its value is
Rv=mcos δ；
Wherein, RvAnd LvIt is virtual resistance value and virtual inductor value respectively；ωbaseIt is fundamental frequency.
Sufficiently large m value is further chosen in design, it is met
And
Wherein, RlineAnd LlineIt is the resistance value and inductance value of transmission line impedance respectively；
It so can be designed so that the value of virtual impedance is much larger than the value of line impedance, so that line impedance value by contrast
It can ignore, each inverter can produce identical voltage reference value vd *And vq *As long as, therefore ensure in claim 3 each
The control parameter of the sagging relational expression of voltage x current of inverter is identical, you can to realize that accurate electric current is equal between shunt chopper
Point.
Specifically, the system that the simulation model of the present invention is made up of two identical inverter parallels is constituted.And in order to
Clearly it is compared with traditional droop control, the simulation model for also establishing traditional droop control is emulated.Simulation parameter
Referring to table 1, wherein Zline1And Zline2The line impedance of respectively two inverters.
The simulation parameter of table 1
Two groups of emulation are respectively that the current uniform effect of two kinds of control methods compares and compared with dynamic responding speed, emulation knot
Fruit difference is as shown in Figure 3 and Figure 4.In figs. 3 and 4, (a1), (a2), (a3) are respectively the electricity under traditional droop control method
Flow direct-axis component, quadrature axis component and frequency oscillogram；(b1) under, (b2), (b3) are respectively the control method proposed in the present invention
Electric current direct-axis component, quadrature axis component and frequency oscillogram.In figure 3, the 1st second when active load increase, from simulation waveform
As can be seen that in the case that line impedance is different, the control method proposed in the present invention has than traditional droop control
There is more preferable current uniform effect；In Fig. 4, the 1.45th second when two inverters start parallel running, can from simulation waveform
To find out, compared to traditional droop control method, the control method proposed in the present invention have faster dynamic responding speed and
More stable transient response.Simulation results show the inventive method has more accurate current uniform effect and faster more stable
Dynamic responding speed.
Experiment porch is made up of inverter (MWINV-9R144) parallel connection of two same models.Experiment parameter referring to table 2,
Wherein Zline1And Zline2The line impedance of respectively two inverters.
The experiment parameter of table 2
| Parameter | Numerical value | Parameter | Numerical value |
| m | 2V/A | n | 2V/A |
| vd0 | 200V | vq0 | 0V |
| i'd0 | 0A | i'q0 | 0A |
| Zline1 | 1.0Ω+2.8mH | Zline2 | 2.8mH |
Fig. 5 and Fig. 6 are given using experimental waveform during control method described in the invention, respectively the inventive method
Power output waveform and steady state voltage current waveform.In Fig. 5, (a) is the oscillogram of shunt chopper active power of output；
(b) it is the oscillogram of shunt chopper output reactive power；In Fig. 6, (a) load change before shunt chopper output voltage and
Current waveform figure；(b) the voltage and current oscillogram exported for shunt chopper after load change.In being tested shown in Fig. 5, the 21st
Reactive load reduces during the second, as can be seen that the active and reactive power of inverter output is all accurately divided equally from experimental waveform；
It can also be seen that before and after load switching, there is good Jun Liute using the shunt chopper of method in the present invention from Fig. 6
Property.Therefore, being experimentally confirmed the inventive method has good current uniform effect.
In summary, the decoupling current droop control method in a kind of synchronous rotating frame is provided in the present invention.In order to
The feasibility of authentication control method, has built the simulation model of two inverter parallels in simulation software PSCAD, and utilizes two
Platform MWINV-9R144 inverters construct experiment porch and carry out hardware verification.Emulation is all demonstrated with experimental result compares tradition
Droop control method, the inventive method can still realize the accurate of each inverter output current in the case where line impedance is different
Respectively, and more quick dynamic response and the good stability of a system are possessed.This method is correct, reliable, is engineer applied
There is provided good reference value.
Claims (6)
1. the decoupling current droop control method of shunt chopper in a kind of microgrid, it is characterised in that comprise the following steps：
1) in an exchange microgrid, N platforms inverter in parallel is included, every inverter is coequally controlled with identical control strategy
It is made as voltage source；
2) every inverter gathers electric capacity both end voltage phase information by voltage phaselocked loop, obtains the direct-axis component of voltage vector
And quadrature axis component, and produce the reference value of electric voltage frequency；Wherein, the adoption rate adjuster in voltage phaselocked loop, joins frequency
Value is examined near fundamental frequency and makes to keep synchronous between each inverter；
3) every inverter gathers the phase information of electric current by electric current phaselocked loop, obtains the direct-axis component and quadrature axis of current phasor
Component；
4) according to step 2) and step 3) the middle voltage phase information and current phase information gathered, current phasor is made into rotation change
Change, obtain virtual current vector, the virtual current vector and voltage vector are equidirectional；
5) in synchronous rotating frame, by step 4) in virtual current vector and step 2) in voltage vector set up sagging
Relation, the sagging relation is used to produce the direct-axis component of voltage and the reference value of quadrature axis component, by reference value input voltage electricity
Throttle regulator is to generate PWM modulation signal.
2. the decoupling current droop control method of shunt chopper in microgrid according to claim 1, it is characterised in that step
It is rapid 4) in virtual current include direct-axis component i'dWith quadrature axis component i'q, direct-axis component i'dWith quadrature axis component i'qCalculated by following formula
Draw：
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The direct-axis component and quadrature axis component of electric current under synchronous rotating frame.
3. the decoupling current droop control method of shunt chopper in microgrid according to claim 2, it is characterised in that step
Rapid 5) the middle sagging relation calculating formula set up is as follows：
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Wherein, vd *And vq *It is the direct-axis component and the reference value of quadrature axis component of voltage under synchronous rotating frame respectively；vd0And vq0
It is v respectivelyd *And vq *Rated value；M and n are defined as on the occasion of being the gain of droop control；i'dAnd i'qIt is that synchronous rotary is sat respectively
The direct-axis component and quadrature axis component of the lower virtual current of mark system；i'd0And i'q0It is i' respectivelydAnd i'qRated value.
4. the decoupling current droop control method of shunt chopper in microgrid according to claim 3, it is characterised in that root
According to virtual current calculating formula and sagging relation calculating formula, control formula is obtained as follows：
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Wherein, RvAnd LvRespectively virtual resistance value and virtual inductor value；ωbaseIt is fundamental frequency.
5. the decoupling current droop control method of shunt chopper in microgrid according to claim 4, it is characterised in that choosing
Sufficiently large m value is taken, it is met：
And
Wherein, RlineAnd LlineIt is the resistance value and inductance value of transmission line impedance respectively, m, which meets the condition, makes virtual impedance
Value is much larger than the value of line impedance, and line impedance value can ignore that, each inverter produces identical voltage reference value vd *With
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6. the decoupling current droop control method of shunt chopper in the microgrid according to any one in Claims 1 to 5,
Characterized in that, in electric current phaselocked loop adoption rate integral controller.
Priority Applications (1)
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| CN107658904A (en) * | 2017-10-30 | 2018-02-02 | 浙江大学 | Consider the impedance self-adaptive power decoupled control method that virtual synchronous machine generator rotor angle influences |
| CN110138215A (en) * | 2019-05-08 | 2019-08-16 | 浙江大学 | Realize the distributed DC-DC convertor module control method of automatic current equalizing parallel output corrugated minimum |
| CN110350580A (en) * | 2019-07-10 | 2019-10-18 | 太原理工大学 | A kind of control method of the low pressure microgrid inverter based on adaptive virtual impedance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107658904A (en) * | 2017-10-30 | 2018-02-02 | 浙江大学 | Consider the impedance self-adaptive power decoupled control method that virtual synchronous machine generator rotor angle influences |
| CN107658904B (en) * | 2017-10-30 | 2020-09-25 | 浙江大学 | Impedance self-adaptive power decoupling control method considering virtual synchronous machine power angle influence |
| CN110138215A (en) * | 2019-05-08 | 2019-08-16 | 浙江大学 | Realize the distributed DC-DC convertor module control method of automatic current equalizing parallel output corrugated minimum |
| CN110350580A (en) * | 2019-07-10 | 2019-10-18 | 太原理工大学 | A kind of control method of the low pressure microgrid inverter based on adaptive virtual impedance |
| CN110350580B (en) * | 2019-07-10 | 2022-04-12 | 太原理工大学 | Control method of low-voltage microgrid inverter based on self-adaptive virtual impedance |
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| CN107134806B (en) | 2020-01-10 |
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