CN110277803A - A kind of the virtual synchronous generator control method and control device of energy accumulation current converter - Google Patents
A kind of the virtual synchronous generator control method and control device of energy accumulation current converter Download PDFInfo
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- CN110277803A CN110277803A CN201910696450.1A CN201910696450A CN110277803A CN 110277803 A CN110277803 A CN 110277803A CN 201910696450 A CN201910696450 A CN 201910696450A CN 110277803 A CN110277803 A CN 110277803A
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- 238000009825 accumulation Methods 0.000 title claims abstract description 55
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000007665 sagging Methods 0.000 claims abstract description 30
- 238000013016 damping Methods 0.000 claims abstract description 21
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- 238000004146 energy storage Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H02J3/382—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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Abstract
The virtual synchronous generator control method and control device of a kind of energy accumulation current converter disclosed by the invention, Damping Power is realized only to work in the dynamic process of frequency fluctuation, Damping Power one is set to zero after stable state, will not because of damped coefficient change and influence the deviation of stable state active power, ensure that and realize active power in the sagging ratio trace command value of setting while inhibiting oscillation of power；In addition, while realizing energy accumulation current converter and being capable of providing inertial supports and simultaneously off-network seamless switching, has the ability that voltage and current ring quickly controls, output electric current is quickly controlled by electric current loop, be conducive to reduce current distortion, improve power quality of the energy accumulation current converter in the operation of grid-connected and island mode.
Description
Technical field
The present invention relates to field of power electronics, the virtual synchronous generator control method of specially a kind of energy accumulation current converter and
Control device.
Background technique
With universal, the distributed generation resource based on power electronic devices of the renewable energy such as photovoltaic power generation and wind-power electricity generation
Permeability in the power system is gradually increased.Increasing for distributed generation unit based on new energy reduces power train
The inertia of system causes the fluctuation of frequency and power.And current grid-connected converter does not have adjusting electricity based on current source mode
The function of Force system frequency and voltage.Therefore energy storage device is added in micro-capacitance sensor, can largely reduces distributed hair
Mains frequency caused by electricity and voltage fluctuation.And energy-storage system most critical is exactly energy accumulation current converter.Current energy accumulation current converter
Under grid-connect mode, using the decoupling control policy of invariable power, i.e. PQ control, under off-network mode, using the control of constant voltage constant frequency
System strategy, i.e. VF control.But when energy accumulation current converter needs mutually to switch under simultaneously off-network both of which, two kinds of control modes are not
It is able to achieve smooth transition, the adjusting that will cause voltage and frequency is discontinuous, or even can cause to impact, and seriously affects the stabilization of power grid
Operation.
Scholar proposes a kind of control strategy of virtual synchronous generator (VSG) in recent years, by simulating synchronous generator
Mechanical property and electromagnetic property, so that distributed generation unit is had inertia and damping characteristic, and provide frequency modulation and voltage modulation to power grid
Effect inhibits the oscillation of output frequency and active power.However this traditional VSG control belongs to voltage source control, under active
The E of phase theta and idle sagging generation that the vertical and hypothetical rotor equation of motion generates directly generates modulation wave voltage, and the magnitude of current is not
Controlled volume, when being incorporated into the power networks, power quality is poor.Especially when energy accumulation current converter parallel connection isolated operation, needed between current transformer
To divide equally power automatically according to capacity.The sagging coefficient in virtual governor module is set generally according to capacity and realizes that power is equal
Point.
But current virtual synchronous generator techniques using simulation Damper Winding by the way of, be all made of constant damping system
Number.When the stable state output frequency of virtual synchronous generator and unequal rated output frequency, damped under existing control strategy
Power is not zero, and damped coefficient and sagging coefficient are located at the same position, therefore two coefficient meetings after arranging governing equation
It interacts, equivalent sagging coefficient changes, and original power distribution effect can also be deteriorated.Energy accumulation current converter cannot be according to appearance
Amount carry out power-sharing, will cause capacity be not fully utilized or overcapacity operation.If reducing damped coefficient to reduce
Influence to sagging coefficient, and can be because damping the too small oscillation for leading to active power of output.Therefore energy accumulation current converter is existing
PQ/VF control mode needs to carry out pattern switching, and virtual synchronous generator control mode can not achieve directly controlling for electric current again,
And the power-sharing performance under isolated island paralleling model is poor.
Summary of the invention
The purpose of the present invention is being directed to the existing PQ/VF control method of energy accumulation current converter, there are needs when from being incorporated into the power networks
The problem of carrying out pattern switching, and existing virtual synchronous generator control method can not control electric current, and in orphan
Power-sharing performance poor status when the parallel running of island proposes a kind of virtual synchronous generator control method of energy accumulation current converter
And control device.
The present invention is to be achieved through the following technical solutions:
A kind of virtual synchronous generator control method of energy accumulation current converter, comprising the following steps:
S1, the actual output frequency ω of virtual synchronous generator is fed back to virtual governor module, by sagging control
Export the reality output active power command value P of hypothetical rotorm；
Wherein, actual output frequency ω is the value of feedback of step S2, and initial time, actual output frequency ω is 0, operation
In, actual output frequency ω is the actual feedback of the hypothetical rotor of step S2；
S2, the reality output active power command value P for obtaining step S1mFeed back hypothetical rotor module, hypothetical rotor
Module exports the actual output frequency ω of virtual synchronous generator, will obtain voltage-phase θ after actual output frequency ω integral；
S3, the reality output reactive power Q of virtual synchronous generator is fed back to virtual excitation controller module, under
Control of hanging down exports the d axis component E of virtual built-in potential；
S4, the d axis component E of virtual built-in potential is input to virtual stator modules, controls output q axis electricity by virtual impedance
Pressure instruction uqrefU is instructed with d shaft voltagedref；
S5, the voltage-phase θ that step S2 is obtained and the d shaft voltage that step S4 is obtained are instructed into udrefRefer to q shaft voltage
Enable uqrefIt is input to voltage and current inner loop module, the modulation wave voltage of d axis and q axis is exported by Double closed-loop of voltage and current,
Modulation wave voltage is subjected to Park-Clark inverse transformation and PWM modulation link output switching signal, and then controls energy accumulation current converter.
Preferably, reality output active power command value P in the step S1mCalculation formula it is as follows:
Pm=Pref+kω(ωs-ω)
Wherein, ωsFor with reference to output frequency, kωFor active sagging coefficient, PrefFor rated active power instruction.
Preferably, the calculation formula of actual output frequency ω is as follows in the step S2:
Wherein, PeFor reality output active power, PdFor Damping Power, J ωsFor virtual angular momentum, ωsFor rated output
Frequency；
The calculation formula of voltage-phase θ is as follows in step S2:
Preferably, the Damping Power PdSteady-state value be zero, when actual output frequency be not equal to rated output frequency when,
PdIt is the nonzero value of following frequency variation, Damping Power P in dynamic processdCalculation formula it is as follows:
Wherein, ωdFor frequency departure compensation rate, Δ ω is revolving speed deviation, and D is damped coefficient, kpdAnd kidRespectively damp
The PI parameter of control.
Preferably, the calculation formula of the d axis component E of virtual built-in potential is as follows in the step S3:
E=Eref+kq(Qref-Q)
Wherein, QrefFor rated reactive power instruction value, Q is reality output reactive power, kqFor idle sagging coefficient, Eref
For rated output voltage instruction value.
Preferably, q shaft voltage instructs u in the step S4qrefU is instructed with d shaft voltagedrefCalculation formula it is as follows:
Wherein, RvAnd XvFor virtual resistance and virtual reactance, iqFor practical q shaft current, idFor practical d shaft current.
Preferably, the calculation formula of the modulation wave voltage of d axis and q axis is as follows in the step S5:
Wherein, umoddAnd umodqWave voltage is modulated for d axis and q axis modulates wave voltage, idrefAnd iqrefFor the instruction of d shaft current
It is instructed with q shaft current, kpvAnd kivThe respectively PI parameter of voltage inter-loop, kpiAnd kiiThe respectively PI parameter of current inner loop.
The present invention also provides a kind of controls of virtual synchronous generator control method for realizing above-mentioned energy accumulation current converter
Device processed, which is characterized in that including virtual governor module, hypothetical rotor module, virtual excitation controller module, virtual stator
Module, Double closed-loop of voltage and current module；
Virtual governor module, the actual output frequency ω for feeding back to virtual stator modules carry out sagging control, and
Export reality output active power command value Pm；
Hypothetical rotor module, for the reality output active power command value P according to virtual governor module feedbackm, defeated
Voltage-phase θ out；
Virtual excitation controller module for carrying out sagging control to received reality output reactive power Q, and exports void
The d axis component E of quasi- built-in potential；
Hypothetical rotor module carries out virtual impedance control for the d axis component E to virtual built-in potential, and exports q shaft voltage
Instruct uqrefU is instructed with d shaft voltagedref；
Voltage and current inner loop module, for instructing u to q shaft voltageqrefU is instructed with d shaft voltagedrefIt is double to carry out voltage and current
Closed-loop control, and export the modulation wave voltage of d axis and q axis.
Compared with prior art, the invention has the following beneficial technical effects:
A kind of virtual synchronous generator control method of energy accumulation current converter proposed by the invention realizes Damping Power only
Work in the dynamic process of frequency fluctuation, Damping Power is zero after stable state, will not because of damped coefficient change and influence
The deviation of stable state active power ensure that and realize that active power is referred in the sagging ratio tracking of setting while inhibiting oscillation of power
Enable value；In addition, having voltage while realizing energy accumulation current converter and being capable of providing inertial supports and simultaneously off-network seamless switching
The ability that electric current loop quickly controls quickly controls output electric current by electric current loop, is conducive to reduce current distortion, improve
Power quality of the energy accumulation current converter in the operation of grid-connected and island mode.
Detailed description of the invention
Fig. 1 is the system construction drawing of the virtual synchronous generator control method of energy accumulation current converter of the present invention；
Fig. 2 is the control block diagram of the virtual synchronous generator control method of energy accumulation current converter of the present invention；
Fig. 3 is the waveform diagram of existing synchronous generator control method active power of output；
Fig. 4 is the waveform diagram of the control method active power of output of the virtual synchronous generator of energy accumulation current converter of the present invention.
In Fig. 1, VdcFor DC voltage, RfFor filter inductance dead resistance, LfFor filter inductance, CfFor filter capacitor.
ZlineFor line impedance.
K in Fig. 2ωFor active sagging coefficient, PeFor reality output active power, PrefFor rated active power instruction value, Pm
For reality output active power command value, PdFor Damping Power, J is the rotary inertia of virtual synchronous generator, and D is damping system
Number, ω is actual output frequency, ωsFor rated output frequency, it is equal to 314rad/s, J ωsFor virtual angular momentum, θ is output electricity
Press phase, QrefFor rated reactive power instruction value, Q is reality output reactive power, kqFor idle sagging coefficient, ErefIt is specified
Output voltage instruction value, E are virtual built-in potential, RvAnd XvFor virtual resistance and virtual reactance, udrefAnd uqrefRefer to for d shaft voltage
It enables and q shaft voltage instructs, idrefAnd iqrefFor the instruction of d shaft current and the instruction of q shaft current, udAnd uqFor practical d shaft voltage and reality
Q shaft voltage, umoddAnd umodqWave voltage is modulated for d axis and q axis modulates wave voltage.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, described to be explanation of the invention rather than limit
It is fixed.
Referring to Fig.2, a kind of virtual synchronous generator control method for energy accumulation current converter, comprising the following steps:
S1, the actual output frequency ω of virtual synchronous generator is fed back to virtual governor module, by sagging control
Export the reality output active power command value P of hypothetical rotorm。
Initial time, actual output frequency ω are 0, and in operation, actual output frequency ω is that the hypothetical rotor of step S2 is anti-
Feedback value.
The specific method is as follows, the reference output frequency ω of virtual synchronous generatorsSubtract the reality of virtual synchronous generator
Output frequency ω, multiplied by active sagging coefficient kω, active deviation delta P is obtained, Δ P and rated active power instruct PrefAfter superposition,
Obtain the reality output active power command value P of hypothetical rotorm, equation is as follows；
Pm=Pref+kω(ωs-ω)
S2, hypothetical rotor module, by the reality output active power command value P of hypothetical rotormFeed back hypothetical rotor mould
Block, hypothetical rotor module export the actual output frequency ω of virtual synchronous generator, will obtain after actual output frequency ω integral
Voltage-phase θ.
The specific method is as follows, the reality output active power command value P that step S1 is obtainedmSubtract reality output wattful power
Rate Pe, then subtract Damping Power Pd, then again divided by virtual angular momentum J ωs, revolving speed deviation delta ω, Δ ω and volume are obtained after integral
Determine output frequency ωsAfter superposition, actual output frequency ω is obtained, formula is as follows:
Wherein, no matter energy accumulation current converter actual output frequency is how many, Damping Power PdSteady-state value be all zero, work as reality
When output frequency is not equal to rated output frequency, PdIt is the nonzero value of following frequency variation, Damping Power P in dynamic processd's
Calculation formula is as follows:
Wherein, ωdFor frequency departure compensation rate, Δ ω is revolving speed deviation, and D is damped coefficient, kpdAnd kidRespectively damp
The PI parameter of control；
Then to output voltage phase theta is obtained after actual output frequency ω integral, equation is as follows:
The reality output reactive power Q of S3, virtual excitation controller module, virtual synchronous generator are fed back to virtual excitation
Controller module exports the d axis component E of virtual built-in potential by sagging control.
The specific method is as follows, using rated reactive power instruction value QrefReality output reactive power Q is subtracted, multiplied by idle
Sagging coefficient kq, obtain voltage magnitude deviation delta E, Δ E and rated output voltage instruction value ErefAfter superposition, electricity in virtual is obtained
The d axis component E of gesture, equation are as follows:
E=Eref+kq(Qref-Q)
The d axis component E of virtual built-in potential is input to virtual stator modules, by virtual impedance by S4, virtual stator modules
Control output q shaft voltage instructs uqrefU is instructed with d shaft voltagedref, the specific method is as follows；
With virtual resistance RvWith practical d shaft current idProduct subtract virtual reactance XvWith practical q shaft current iqProduct,
Obtain virtual impedance d axis pressure drop；
With virtual resistance RvWith practical q shaft current iqProduct add virtual reactance XvWith practical d shaft current idProduct,
Obtain virtual impedance q axis pressure drop；
Virtual built-in potential d axis component E subtracts virtual impedance d axis pressure drop, obtains d shaft voltage instruction udref；
If the q axis component of virtual built-in potential is 0, use 0 subtracts the q axis pressure drop of virtual impedance, obtains the instruction of q shaft voltage
uqref, equation is as follows:
S5, voltage and current inner loop module refer to the voltage-phase θ that step S2 is obtained and the d shaft voltage that step S4 is obtained
Enable udrefU is instructed with q shaft voltageqrefIt is input to voltage and current inner loop module, exports d axis and q by Double closed-loop of voltage and current
Modulation wave voltage is carried out Park-Clark inverse transformation and PWM modulation link output switching signal, in turn by the modulation wave voltage of axis
Control energy accumulation current converter.
The three-phase alternating voltage u obtained by samplingabc, Park-Clark change is carried out according to the θ that hypothetical rotor module obtains
It changes, obtains practical d shaft voltage udWith practical q shaft voltage uq；The three-phase alternating current i obtained by samplingabc, according to hypothetical rotor mould
The θ that block obtains carries out Park-Clark transformation, obtains practical d shaft current idWith practical q shaft current iq；
The d shaft voltage that Voltage loop obtains step S4 instructs udrefWith practical d shaft voltage udMake difference to calculate through PI controller
I is instructed to d shaft currentdref；The q shaft voltage that step S4 is obtained instructs uqrefWith practical q shaft voltage uqMake difference through PI controller meter
Calculation obtains q shaft current instruction iqref, equation is as follows；
Current inner loop is by idrefWith practical d shaft current idIt makes the difference, d axis modulation wave voltage u is calculated through PI controllermodd；
Current inner loop is by iqrefWith practical q shaft current iqIt makes the difference, q axis modulation wave voltage u is calculated through PI controllermodq；
The calculation formula of rear class d axis and q axis modulation wave voltage are as follows:
Wherein, kpv、kivThe respectively PI parameter of voltage inter-loop, kpi、kiiThe respectively PI parameter of current inner loop.
A kind of virtual synchronous generator control method of energy accumulation current converter proposed by the present invention, the reality of virtual synchronous generator
Output frequency feedback in border exports reality output active power command value to virtual governor module, by sagging control；Then will
Reality output active power command value feedback exports the actual output frequency of virtual synchronous generator to hypothetical rotor module, will
Voltage-phase is obtained after actual output frequency integral；Then reality output reactive power is fed back to virtual excitation controller mould again
Block exports virtual built-in potential by sagging control；Virtual stator modules calculate d axis and q axis virtual impedance pressure drop, virtual built-in potential
It subtracts virtual impedance pressure drop and obtains d axis and the instruction of q shaft voltage, obtain d axis by Voltage loop and q shaft current instructs, using electricity
Stream ring obtains d axis and q axis modulating wave component of voltage, to d axis and q axis modulating wave component of voltage carry out Park-Clark inverse transformation and
PWM modulation link output switching signal, and then control energy accumulation current converter.
The permeability of the distributed generation resource based on power electronic devices in the power system is gradually increased at present, and is distributed
Formula generator unit increases the inertia for reducing electric system, easily causes the fluctuation of frequency and power.The present invention proposes one kind
The virtual synchronous generator control method of energy accumulation current converter, realize energy accumulation current converter be capable of providing inertial supports and and from
While net seamless switching, have the ability that voltage and current ring quickly controls, output electric current is quickly controlled by electric current loop
System is conducive to reduce current distortion, improves power quality of the energy accumulation current converter in the operation of grid-connected and island mode.In addition,
The present invention can be realized Damping Power and only work in the dynamic process of frequency fluctuation, and Damping Power one is set to zero after stable state,
Will not because of damped coefficient change and influence the deviation of stable state active power, ensure that and realize have while inhibiting oscillation of power
Function power is in the sagging ratio trace command value set.
As shown in Figure 1, the present invention also provides a kind of virtual synchronous generator control sides of energy accumulation current converter described above
The control device of method, including virtual governor module, hypothetical rotor module, virtual excitation controller module, virtual stator modules,
Double closed-loop of voltage and current module；
Virtual governor module, the actual output frequency ω for feeding back to virtual stator modules carry out sagging control, and
Export reality output active power command value Pm；
Hypothetical rotor module, for the border active power of output instruction value P according to virtual governor module feedbackm, output
Voltage-phase θ；
Virtual excitation controller module for carrying out sagging control to received reality output reactive power Q, and exports void
The d axis component E of quasi- built-in potential；
Hypothetical rotor module carries out virtual impedance control for the d axis component E to virtual built-in potential, and exports q shaft voltage
Instruct uqrefU is instructed with d shaft voltagedref；
Voltage and current inner loop module, for instructing u to q shaft voltageqrefU is instructed with d shaft voltagedrefIt is double to carry out voltage and current
Closed-loop control, and export the modulation wave voltage of d axis and q axis.
Simulating, verifying
By taking two energy accumulation current converter isolated operations in parallel as an example, when system burden with power changes, pass through observation
The response wave shape of two energy accumulation current converter active power of output, by the virtual synchronous generator of energy accumulation current converter proposed by the present invention
Control method is compared and analyzed with traditional synchronous generator control method.
Fig. 3 is using traditional synchronous generator control method, and output has when two energy accumulation current converter isolated operations in parallel
The experimental waveform of function power.
Fig. 4 is the virtual synchronous generator control method using energy accumulation current converter proposed by the present invention, two energy storage in parallel
The experimental waveform of active power of output when current transformer isolated operation.
Table 1 is the parameter list of two energy accumulation current converters.
Using the virtual synchronous generator control method of energy accumulation current converter of the present invention, in 0 to 30 seconds periods, in system
Active to bear as 150W, two energy accumulation current converter active power of output are respectively 90W and 60W, and system frequency is located at 50Hz, two storages
Energy current transformer divides equally active power with the ratio of 3:2.The 30th second moment, 170W burden with power was put into system.
As shown in figure 3, when using traditional virtual synchronous generator strategy, it can be seen that two energy accumulation current converter outputs
There is no oscillations for active power.And in stable state, two energy accumulation current converters export 173W and 147W active power respectively, and
Not according to capacity than the ratio uniform distribution with 3:2.And when using the virtual synchronous generator control method in the present invention, such as
Shown in Fig. 4, two energy accumulation current converter active power of output do not vibrate still.When reaching stable state, two energy accumulation current converters point
Not Shu Chu 192W and 128W, according to capacity than with the distribution of the ratio uniform of 3:2.
By comparison diagram 3 and Fig. 4 it is found that the virtual synchronous generator control method of energy accumulation current converter proposed by the present invention,
It not only remains traditional virtual synchronous generator control method and inhibits the function of oscillation of power, but also ensure that two current transformers are defeated
Power out is all the sagging ratio trace command in setting.
The parameter list of 1 two energy accumulation current converters of table
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (8)
1. a kind of virtual synchronous generator control method of energy accumulation current converter, which comprises the following steps:
S1, the actual output frequency ω of virtual synchronous generator is fed back to virtual governor module, is exported by sagging control
The reality output active power command value P of hypothetical rotorm；
Wherein, actual output frequency ω is the value of feedback of step S2, and initial time, actual output frequency ω is 0, real in operation
Border output frequency ω is the actual feedback of the hypothetical rotor of step S2；
S2, the reality output active power command value P for obtaining step S1mHypothetical rotor module is fed back, hypothetical rotor module is defeated
The actual output frequency ω of virtual synchronous generator out will obtain voltage-phase θ after actual output frequency ω integral；
S3, the reality output reactive power Q of virtual synchronous generator is fed back to virtual excitation controller module, by sagging control
System exports the d axis component E of virtual built-in potential；
S4, the d axis component E of virtual built-in potential is input to virtual stator modules, controls output q shaft voltage by virtual impedance and refers to
Enable uqrefU is instructed with d shaft voltagedref；
S5, the voltage-phase θ that step S2 is obtained and the d shaft voltage that step S4 is obtained are instructed into udrefIt is instructed with q shaft voltage
uqrefIt is input to voltage and current inner loop module, it, will by the modulation wave voltage of Double closed-loop of voltage and current output d axis and q axis
It modulates wave voltage and carries out Park-Clark inverse transformation and PWM modulation link output switching signal, and then control energy accumulation current converter.
2. the virtual synchronous generator control method of energy accumulation current converter according to claim 1, which is characterized in that the step
Reality output active power command value P in S1mCalculation formula it is as follows:
Pm=Pref+kω(ωs-ω)
Wherein, ωsFor with reference to output frequency, kωFor active sagging coefficient, PrefFor rated active power instruction.
3. the virtual synchronous generator control method of energy accumulation current converter according to claim 2, which is characterized in that the step
The calculation formula of actual output frequency ω is as follows in S2:
Wherein, PeFor reality output active power, PdFor Damping Power, J ωsFor virtual angular momentum, ωsFor rated output frequency；
The calculation formula of voltage-phase θ is as follows in step S2:
4. the virtual synchronous generator control method of energy accumulation current converter according to claim 3, which is characterized in that the damping
Power PdSteady-state value be zero, when actual output frequency be not equal to rated output frequency when, PdIt is following frequency in dynamic process
The nonzero value of variation, Damping Power PdCalculation formula it is as follows:
Wherein, ωdFor frequency departure compensation rate, Δ ω is revolving speed deviation, and D is damped coefficient, kpdAnd kidRespectively damping control
PI parameter.
5. the virtual synchronous generator control method of energy accumulation current converter according to claim 4, which is characterized in that the step
The calculation formula of the d axis component E of virtual built-in potential is as follows in S3:
E=Eref+kq(Qref-Q)
Wherein, QrefFor rated reactive power instruction value, Q is reality output reactive power, kqFor idle sagging coefficient, ErefFor volume
Determine output voltage instruction value.
6. the virtual synchronous generator control method of energy accumulation current converter according to claim 5, which is characterized in that the step
Q shaft voltage instructs u in S4qrefU is instructed with d shaft voltagedrefCalculation formula it is as follows:
Wherein, RvAnd XvFor virtual resistance and virtual reactance, iqFor practical q shaft current, idFor practical d shaft current.
7. the virtual synchronous generator control method of energy accumulation current converter according to claim 6, which is characterized in that the step
The calculation formula of the modulation wave voltage of d axis and q axis is as follows in S5:
Wherein, umoddAnd umodqWave voltage is modulated for d axis and q axis modulates wave voltage, idrefAnd iqrefFor the instruction of d shaft current and q axis
Current-order, kpvAnd kivThe respectively PI parameter of voltage inter-loop, kpiAnd kiiThe respectively PI parameter of current inner loop.
8. a kind of control of the virtual synchronous generator control method for realizing any one of the claim 1-7 energy accumulation current converter
Device processed, which is characterized in that including virtual governor module, hypothetical rotor module, virtual excitation controller module, virtual stator
Module, Double closed-loop of voltage and current module；
Virtual governor module, the actual output frequency ω for feeding back to virtual stator modules carries out sagging control, and exports
Reality output active power command value Pm；
Hypothetical rotor module, for the reality output active power command value P according to virtual governor module feedbackm, output voltage
Phase theta；
Virtual excitation controller module for carrying out sagging control to received reality output reactive power Q, and exports in virtual
The d axis component E of potential；
Hypothetical rotor module carries out virtual impedance control for the d axis component E to virtual built-in potential, and exports the instruction of q shaft voltage
uqrefU is instructed with d shaft voltagedref；
Voltage and current inner loop module, for instructing u to q shaft voltageqrefU is instructed with d shaft voltagedrefCarry out voltage and current double closed-loop
Control, and export the modulation wave voltage of d axis and q axis.
Priority Applications (1)
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| CN201910696450.1A CN110277803B (en) | 2019-07-30 | 2019-07-30 | Virtual synchronous generator control method and control device of energy storage converter |
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