CN110277803B - Virtual synchronous generator control method and control device of energy storage converter - Google Patents
Virtual synchronous generator control method and control device of energy storage converter Download PDFInfo
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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
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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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- 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
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Abstract
The invention discloses a control method and a control device for a virtual synchronous generator of an energy storage converter, which realize that damping power only acts in the dynamic process of frequency fluctuation, the damping power is determined to be zero after a steady state, the deviation of steady state active power cannot be influenced due to the change of a damping coefficient, and the control method and the control device ensure that the active power tracks a command value according to a set droop proportion while inhibiting power oscillation; in addition, the energy storage converter can provide inertial support and on-grid and off-grid seamless switching, meanwhile, the capacity of quickly controlling a voltage current loop is achieved, the output current is quickly controlled through the current loop, current distortion is reduced, and the electric energy quality of the energy storage converter during grid-connected and island mode operation is improved.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a virtual synchronous generator control method and a virtual synchronous generator control device of an energy storage converter.
Background
With the popularization of renewable energy sources such as photovoltaic power generation and wind power generation, the permeability of a distributed power supply based on power electronic devices in a power system is gradually increased. The increase of distributed power generation units mainly using new energy reduces the inertia of a power system, and causes the fluctuation of frequency and power. The current grid-connected converter is mainly in a current source mode and does not have the function of adjusting the frequency and the voltage of a power system. Therefore, the energy storage device is added into the micro-grid, and grid frequency and voltage fluctuation caused by distributed power generation can be greatly reduced. The most important of the energy storage system is an energy storage converter. The existing energy storage converter adopts a constant-power decoupling control strategy, namely PQ control, in a grid-connected mode, and adopts a constant-voltage constant-frequency control strategy, namely VF control, in an off-grid mode. However, when the energy storage converter needs to be switched between the grid-connected mode and the off-grid mode, the two control modes cannot realize stable transition, so that the adjustment of voltage and frequency is discontinuous, even impact is caused, and the stable operation of a power grid is seriously influenced.
In recent years, researchers have proposed a control strategy for a Virtual Synchronous Generator (VSG), which simulates the mechanical and electromagnetic characteristics of a synchronous generator, thereby providing a distributed power generation unit with inertia and damping characteristics, and providing frequency modulation and voltage regulation functions to a power grid, thereby suppressing oscillation of output frequency and active power. However, the traditional VSG control belongs to voltage source control, the phase theta generated by active droop and a virtual rotor motion equation and the E generated by reactive droop directly generate modulation wave voltage, the current amount is not controlled, and the electric energy quality is poor during grid-connected operation. Particularly, when the energy storage converters run in parallel isolated islands, the power between the converters needs to be automatically and equally divided according to the capacity. Power averaging is typically achieved by setting the droop factor in the virtual governor module according to capacity.
However, the current virtual synchronous generator technology adopts a mode of simulating a damping winding, and constant damping coefficients are adopted. When the steady-state output frequency and the rated output frequency of the virtual synchronous generator are not equal, the damping power under the existing control strategy is not zero, and the damping coefficient and the droop coefficient are located at the same position after the control equation is arranged, so that the two coefficients can affect each other, the equivalent droop coefficient is changed, and the original power distribution effect is also poor. The energy storage converter cannot perform power sharing according to the capacity, so that the capacity cannot be fully utilized or the energy storage converter runs in an over-capacity mode. If the damping coefficient is reduced to reduce the influence on the droop coefficient, the oscillation of the output active power can be caused because the damping is too small. Therefore, the existing PQ/VF control mode of the energy storage converter needs to be switched, the virtual synchronous generator control mode cannot realize direct control of current, and the power average performance in an island parallel mode is poor.
Disclosure of Invention
The invention aims to provide a virtual synchronous generator control method and a virtual synchronous generator control device of an energy storage converter, aiming at the problems that the existing PQ/VF control method of the energy storage converter needs to carry out mode switching when in off-grid and on-grid operation, but the existing virtual synchronous generator control method cannot control current and has poor power uniformity performance when in island parallel operation.
The invention is realized by the following technical scheme:
a virtual synchronous generator control method of an energy storage converter comprises the following steps:
s1, feeding back the actual output frequency omega of the virtual synchronous generator to the virtual speed regulator module, and outputting the actual output active power instruction value P of the virtual rotor through droop controlm；
Wherein the actual output frequency ω is the feedback value of step S2, the actual output frequency ω is 0 at the initial time, and the actual output frequency ω is the actual feedback value of the virtual rotor of step S2 during operation;
s2, calculating the actual output active power command value P obtained in step S1mFeeding back the actual output frequency omega of the virtual synchronous generator to the virtual rotor module, and integrating the actual output frequency omega to obtain a voltage phase theta;
s3, feeding back the actual output reactive power Q of the virtual synchronous generator to the virtual excitation controller module, and outputting a d-axis component E of the virtual internal potential through droop control;
s4, inputting the d-axis component E of the virtual internal potential to the virtual stator module, and outputting a q-axis voltage command u through virtual impedance controlqrefAnd d-axis voltage command udref；
S5, converting the voltage phase theta obtained in the step S2 and the d-axis voltage command u obtained in the step S4drefAnd q-axis voltage command uqrefThe voltage and current modulation signals are input to a voltage and current inner ring module, d-axis and q-axis modulation wave voltages are output through voltage and current double closed loop control, Park-Clark inverse transformation and PWM modulation links are carried out on the modulation wave voltages, and then the energy storage converter is controlled.
Preferably, the active power command value P is actually output in step S1mThe calculation formula of (a) is as follows:
Pm＝Pref+kω(ωs-ω)
wherein, ω issFor reference output frequency, kωIs the active sag factor, PrefIs the rated active power command.
Preferably, the calculation formula of the actual output frequency ω in step S2 is as follows:
wherein, PeFor the actual output of active power, PdFor damping power, J omegasIs a virtual angular momentum;
the calculation formula of the voltage phase θ in step S2 is as follows:
preferably, the damping power PdIs zero, when the actual output frequency is not equal to the nominal output frequency, PdDamping power P for non-zero values following frequency changes in dynamic processesdThe calculation formula of (a) is as follows:
wherein, ω isdIs the frequency deviation compensation quantity, delta omega is the rotating speed deviation, D is the damping coefficient, kpdAnd kidRespectively, PI parameters for damping control.
Preferably, the calculation formula of the d-axis component E of the virtual internal potential in step S3 is as follows:
E＝Eref+kq(Qref-Q)
wherein Q isrefIs a rated reactive power command value, Q is actual output reactive power, kqIs a reactive sag factor, ErefIs a rated output voltage command value.
Preferably, the q-axis voltage command u in step S4qrefAnd d-axis voltage command udrefThe calculation formula of (a) is as follows:
wherein R isvAnd XvFor virtual resistance and virtual reactance, iqFor actual q-axis current, idIs the actual d-axis current.
Preferably, the formula for calculating the modulated wave voltages of the d-axis and the q-axis in step S5 is as follows:
wherein u ismoddAnd umodqFor d-axis and q-axis modulated wave voltages, idrefAnd iqrefFor d-axis and q-axis current commands, kpiAnd kiiRespectively, the PI parameters of the current inner loop.
The invention also provides a control device for realizing the control method of the virtual synchronous generator of the energy storage converter, which is characterized by comprising a virtual speed regulator module, a virtual rotor module, a virtual excitation controller module, a virtual stator module and a voltage and current double closed-loop control module;
a virtual speed regulator module for droop control of the actual output frequency omega fed back by the virtual rotor module and outputting an actual output active power instruction value Pm；
A virtual rotor module for outputting an active power command value P according to the actual output fed back by the virtual speed regulator modulemThe output voltage phase θ;
the virtual excitation controller module is used for carrying out droop control on the received actual output reactive power Q and outputting a d-axis component E of a virtual internal potential;
a virtual stator module for performing virtual impedance control on the d-axis component E of the virtual internal potential and outputting a q-axis voltage command uqrefAnd d-axis voltage command udref；
A voltage-current inner loop module for commanding q-axis voltage uqrefAnd d-axis voltage command udrefAnd performing voltage-current double closed-loop control, and outputting modulated wave voltages of a d axis and a q axis.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the virtual synchronous generator control method of the energy storage converter, the damping power only acts in the dynamic process of frequency fluctuation, the damping power is zero after the steady state, the deviation of steady state active power cannot be influenced due to the change of the damping coefficient, and the active power is enabled to track the instruction value according to the set droop proportion while the power oscillation is restrained; in addition, the energy storage converter can provide inertial support and on-grid and off-grid seamless switching, meanwhile, the capacity of quickly controlling a voltage current loop is achieved, the output current is quickly controlled through the current loop, current distortion is reduced, and the electric energy quality of the energy storage converter during grid-connected and island mode operation is improved.
Drawings
FIG. 1 is a system configuration diagram of a virtual synchronous generator control method of an energy storage converter according to the present invention;
FIG. 2 is a control block diagram of a virtual synchronous generator control method of the energy storage converter according to the present invention;
FIG. 3 is a waveform diagram of the output active power of the prior art synchronous generator control method;
fig. 4 is a waveform diagram of the active power output by the control method of the virtual synchronous generator of the energy storage converter.
In FIG. 1, VdcIs a DC side voltage, RfIs parasitic resistance of filter inductor, LfIs a filter inductor, CfIs a filter capacitor. ZlineIs the line impedance.
K in FIG. 2ωIs the active sag factor, PeFor the actual output of active power, PrefIs a nominal active power command value, PmFor actually outputting the active power command value, PdIs damping power, J is the rotational inertia of the virtual synchronous generator, D is the damping coefficient, omega is the actual output frequency, omega is the damping coefficientsIs a rated output frequency equal to 314rad/s, J omegasIs the virtual angular momentum, theta is the output voltage phase, QrefIs a rated reactive power command value, Q is actual output reactive power, kqIs a reactive sag factor, ErefA rated output voltage command value, E a virtual internal potential, RvAnd XvTo virtual resistance and virtual reactance, udrefAnd uqrefFor d-axis and q-axis voltage commands, idrefAnd iqrefFor d-axis and q-axis current commands, udAnd uqFor the actual d-axis voltage and the actual q-axis voltage, umoddAnd umodqThe d-axis modulated wave voltage and the q-axis modulated wave voltage.
Detailed Description
The present invention will now be described in further detail with reference to the attached drawings, which are illustrative, but not limiting, of the present invention.
Referring to fig. 2, a virtual synchronous generator control method for an energy storage converter includes the following steps:
s1, feeding back the actual output frequency omega of the virtual synchronous generator to the virtual speed regulator module, and outputting virtual rotation through droop controlActual output active power command value P of the sonm。
At the initial time, the actual output frequency ω is 0, and during operation, the actual output frequency ω is the virtual rotor feedback value of step S2.
The specific method is that the reference output frequency omega of the virtual synchronous generatorsSubtracting the actual output frequency omega of the virtual synchronous generator and multiplying the actual output frequency omega by an active droop coefficient kωObtaining the active deviation delta P, delta P and the rated active power instruction PrefAfter superposition, obtaining the actual output active power instruction value P of the virtual rotormThe equation is as follows;
Pm＝Pref+kω(ωs-ω)
s2, virtual rotor module, virtual rotor actual output active power instruction value PmAnd feeding back the frequency to the virtual rotor module, outputting the actual output frequency omega of the virtual synchronous generator by the virtual rotor module, and integrating the actual output frequency omega to obtain the voltage phase theta.
The specific method is as follows, the actual output active power command value P obtained in step S1mSubtracting the actual output active power PeThen subtract the damping power PdThen divided by the virtual angular momentum J ωsAfter integration, the rotation speed deviation delta omega, delta omega and the rated output frequency omega are obtainedsAfter superposition, the actual output frequency ω is obtained, and the formula is as follows:
wherein, no matter the actual output frequency of the energy storage converter is, the damping power PdIs zero, when the actual output frequency is not equal to the rated output frequency, PdDamping power P for non-zero values following frequency changes in dynamic processesdThe calculation formula of (a) is as follows:
wherein, ω isdIs the frequency deviation compensation quantity, delta omega is the rotating speed deviation, D is the damping coefficient, kpdAnd kidRespectively are PI parameters of damping control;
then, the actual output frequency ω is integrated to obtain the output voltage phase θ, and the equation is as follows:
and S3, the virtual excitation controller module feeds back the actual output reactive power Q of the virtual synchronous generator to the virtual excitation controller module, and outputs the d-axis component E of the virtual internal potential through droop control.
The specific method is as follows, a rated reactive power instruction value Q is adoptedrefSubtracting the actual output reactive power Q and multiplying by a reactive droop coefficient kqObtaining the voltage amplitude deviation delta E, delta E and the rated output voltage command value ErefAfter superposition, the d-axis component E of the virtual internal potential is obtained, and the equation is as follows:
E＝Eref+kq(Qref-Q)
s4, the virtual stator module inputs the d-axis component E of the virtual internal potential to the virtual stator module and outputs a q-axis voltage command u through virtual impedance controlqrefAnd d-axis voltage command udrefThe specific method is as follows;
by means of a dummy resistor RvAnd the actual d-axis current idProduct of minus the virtual reactance XvWith actual q-axis current iqThe product of the two to obtain the d-axis voltage drop of the virtual impedance;
by means of a dummy resistor RvWith actual q-axis current iqProduct of (d) plus virtual reactance XvAnd the actual d-axis current idObtaining the q-axis voltage drop of the virtual impedance;
subtracting d-axis voltage drop of virtual impedance from d-axis component E of virtual internal potential to obtain d-axis voltage command udref；
Setting the q-axis component of the virtual internal potential as 0, and subtracting the q-axis voltage drop of the virtual impedance from 0 to obtain a q-axis voltage commanduqrefThe equation is as follows:
s5, a voltage-current inner loop module, which is used for converting the voltage phase theta obtained in the step S2 and the d-axis voltage command u obtained in the step S4drefAnd q-axis voltage command uqrefThe voltage and current modulation signals are input to a voltage and current inner ring module, d-axis and q-axis modulation wave voltages are output through voltage and current double closed loop control, Park-Clark inverse transformation and PWM modulation links are carried out on the modulation wave voltages, and then the energy storage converter is controlled.
Three-phase AC voltage u obtained by samplingabcCarrying out Park-Clark conversion according to theta obtained by the virtual rotor module to obtain actual d-axis voltage udAnd the actual q-axis voltage uq(ii) a Three-phase alternating current i obtained by samplingabcCarrying out Park-Clark conversion according to theta obtained by the virtual rotor module to obtain actual d-axis current idAnd the actual q-axis current iq；
The voltage loop sends the d-axis voltage command u obtained in step S4drefAnd the actual d-axis voltage udCalculating the difference by a PI controller to obtain a d-axis current instruction idref(ii) a The q-axis voltage command u obtained in step S4qrefWith actual q-axis voltage uqCalculating the difference by a PI controller to obtain a q-axis current instruction iqrefThe equation is as follows;
current inner loop idrefAnd the actual d-axis current idMaking difference, and calculating by PI controller to obtain d-axis modulated wave voltage umodd；
Current inner loop iqrefWith actual q-axis current iqMaking difference, and calculating by PI controller to obtain q-axis modulation wave voltage umodq；
The calculation formula of the modulation wave voltage of the rear-stage d axis and q axis is as follows:
wherein k ispi、kiiRespectively, the PI parameters of the current inner loop.
The invention provides a virtual synchronous generator control method of an energy storage converter, wherein the actual output frequency of a virtual synchronous generator is fed back to a virtual speed regulator module, and an actual output active power instruction value is output through droop control; then feeding back the actual output active power instruction value to the virtual rotor module, outputting the actual output frequency of the virtual synchronous generator, and integrating the actual output frequency to obtain a voltage phase; then, feeding back the actual output reactive power to a virtual excitation controller module to output a virtual internal potential through droop control; the virtual stator module calculates d-axis and q-axis virtual impedance voltage drop, the virtual internal potential subtracts the virtual impedance voltage drop to obtain d-axis and q-axis voltage commands, d-axis and q-axis current commands are obtained through a voltage loop, d-axis and q-axis modulated wave voltage components are obtained through a current loop, Park-Clark inverse transformation and PWM modulation are carried out on the d-axis and q-axis modulated wave voltage components to output switching signals, and then the energy storage converter is controlled.
At present, the permeability of distributed power supplies mainly comprising power electronic devices in a power system is gradually increased, and the inertia of the power system is reduced due to the increase of distributed power generation units, so that the fluctuation of frequency and power is easily caused. The invention provides a virtual synchronous generator control method of an energy storage converter, which has the capability of quickly controlling a voltage current loop while realizing that the energy storage converter can provide inertial support and on-grid and off-grid seamless switching, is favorable for reducing current distortion by quickly controlling output current through the current loop, and improves the electric energy quality of the energy storage converter during on-grid and off-island mode operation. In addition, the invention can realize that the damping power only acts in the dynamic process of frequency fluctuation, the damping power is set to be zero after the steady state, the deviation of the steady state active power cannot be influenced due to the change of the damping coefficient, and the invention ensures that the active power tracks the instruction value according to the set droop proportion while inhibiting the power oscillation.
As shown in fig. 1, the present invention further provides a control device of the control method for the virtual synchronous generator of the energy storage converter, including a virtual speed regulator module, a virtual rotor module, a virtual excitation controller module, a virtual stator module, and a voltage-current double closed-loop control module;
a virtual speed regulator module for droop control of the actual output frequency omega fed back by the virtual rotor module and outputting an actual output active power instruction value Pm；
A virtual rotor module for outputting an active power command value P according to the feedback of the virtual speed regulator modulemThe output voltage phase θ;
the virtual excitation controller module is used for carrying out droop control on the received actual output reactive power Q and outputting a d-axis component E of a virtual internal potential;
a virtual stator module for performing virtual impedance control on the d-axis component E of the virtual internal potential and outputting a q-axis voltage command uqrefAnd d-axis voltage command udref；
A voltage-current inner loop module for commanding q-axis voltage uqrefAnd d-axis voltage command udrefAnd performing voltage-current double closed-loop control, and outputting modulated wave voltages of a d axis and a q axis.
Simulation verification
According to the method, two parallel energy storage converters are taken as an example of island operation, when the active load of a system changes, the virtual synchronous generator control method of the energy storage converters provided by the invention is compared and analyzed with the traditional synchronous generator control method by observing the response waveform of the active power output by the two energy storage converters.
Fig. 3 is an experimental waveform of active power output when two parallel energy storage converters operate in an isolated island manner by using a conventional synchronous generator control method.
Fig. 4 is an experimental waveform of active power output when two parallel energy storage converters run in an isolated island manner by using the virtual synchronous generator control method of the energy storage converter provided by the invention.
Table 1 shows the parameters of two energy storage converters.
By adopting the virtual synchronous generator control method of the energy storage converter, the active power in the system is 150W in the time period of 0-30 seconds, the output active power of the two energy storage converters is 90W and 60W respectively, the system frequency is 50Hz, and the two energy storage converters share the active power equally in the proportion of 3: 2. At the 30 th second, 170W real load was placed into the system.
When the conventional virtual synchronous generator strategy is adopted, as shown in fig. 3, it can be seen that the output active power of the two energy storage converters does not oscillate. In a steady state, the two energy storage converters respectively output 173W and 147W active power and are not uniformly distributed according to the capacity ratio of 3: 2. However, when the virtual synchronous generator control method of the present invention is adopted, as shown in fig. 4, the output active power of the two energy storage converters still does not oscillate. When the steady state is reached, the two energy storage converters respectively output 192W and 128W, and the output power is uniformly distributed according to the capacity ratio in a ratio of 3: 2.
As can be seen from a comparison between fig. 3 and fig. 4, the virtual synchronous generator control method of the energy storage converter according to the present invention not only retains the function of suppressing power oscillation of the conventional virtual synchronous generator control method, but also ensures that the power output by the two converters is tracked according to the set droop ratio.
TABLE 1 parameter table of two energy storage converters
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (6)
1. A virtual synchronous generator control method of an energy storage converter is characterized by comprising the following steps:
s1, feeding back the actual output frequency omega of the virtual synchronous generator to the virtual speed regulator module, and outputting the actual output active power instruction value P of the virtual rotor through droop controlm；
Wherein the actual output frequency ω is the feedback value of step S2, the actual output frequency ω is 0 at the initial time, and the actual output frequency ω is the actual feedback value of the virtual rotor of step S2 during operation;
s2, calculating the actual output active power command value P obtained in step S1mFeeding back the actual output frequency omega of the virtual synchronous generator to the virtual rotor module, and integrating the actual output frequency omega to obtain a voltage phase theta;
the calculation formula of the actual output frequency ω is as follows:
wherein, PeFor the actual output of active power, PdFor damping power, J omegasIs a virtual angular momentum, ωsIs a rated output frequency;
the calculation formula of the voltage phase θ in step S2 is as follows:
the damping power PdIs zero, when the actual output frequency is not equal to the nominal output frequency, PdDamping power P for non-zero values following frequency changes in dynamic processesdThe calculation formula of (a) is as follows:
wherein, ω isdIs the frequency deviation compensation quantity, delta omega is the rotating speed deviation, D is the damping coefficient, kpdAnd kidRespectively are PI parameters of damping control;
s3, feeding back the actual output reactive power Q of the virtual synchronous generator to the virtual excitation controller module, and outputting a d-axis component E of the virtual internal potential through droop control;
s4, inputting the d-axis component E of the virtual internal potential to the virtual stator module, and outputting a q-axis voltage command u through virtual impedance controlqrefAnd d-axis voltage command udref；
S5, converting the voltage phase theta obtained in the step S2 and the d-axis voltage command u obtained in the step S4drefAnd q-axis voltage command uqrefThe voltage and current modulation signals are input to a voltage and current inner ring module, d-axis and q-axis modulation wave voltages are output through voltage and current double closed loop control, Park-Clark inverse transformation and PWM modulation links are carried out on the modulation wave voltages, and then the energy storage converter is controlled.
2. The virtual synchronous generator control method of the energy storage converter according to claim 1, wherein the active power command value P is actually outputted in the step S1mThe calculation formula of (a) is as follows:
Pm＝Pref+kω(ωs-ω)
wherein k isωIs the active sag factor, PrefIs the rated active power command.
3. The virtual synchronous generator control method of the energy storage converter according to claim 1, wherein the calculation formula of the d-axis component E of the virtual internal potential in the step S3 is as follows:
E＝Eref+kq(Qref-Q)
wherein Q isrefIs a rated reactive power command value, Q is actual output reactive power, kqIs a reactive sag factor, ErefIs a rated output voltage command value.
4. Method for controlling a virtual synchronous generator of an energy storage converter according to claim 3, characterized in that said step S4 q-axis voltage command uqrefAnd d-axis voltage command udrefThe calculation formula of (a) is as follows:
wherein R isvAnd XvFor virtual resistance and virtual reactance, iqFor actual q-axis current, idIs the actual d-axis current.
5. The virtual synchronous generator control method of the energy storage converter according to claim 4, wherein the calculation formula of the modulated wave voltages of the d-axis and the q-axis in step S5 is as follows:
wherein u ismoddAnd umodqFor d-axis and q-axis modulated wave voltages, idrefAnd iqrefFor d-axis and q-axis current commands, kpiAnd kiiRespectively, the PI parameters of the current inner loop.
6. A control device for realizing the virtual synchronous generator control method of the energy storage converter as claimed in any one of claims 1 to 5, characterized by comprising a virtual speed regulator module, a virtual rotor module, a virtual excitation controller module, a virtual stator module and a voltage and current double closed loop control module;
a virtual speed regulator module for droop control of the actual output frequency omega fed back by the virtual rotor module and outputting an actual output active power instruction value Pm；
A virtual rotor module for outputting an active power command value P according to the actual output fed back by the virtual speed regulator modulemThe output voltage phase θ;
the virtual excitation controller module is used for carrying out droop control on the received actual output reactive power Q and outputting a d-axis component E of a virtual internal potential;
a virtual stator module for performing virtual impedance control on the d-axis component E of the virtual internal potential and outputting a q-axis voltage command uqrefAnd d-axis voltage command udref；
A voltage-current inner loop module for commanding q-axis voltage uqrefAnd d-axis voltage command udrefAnd performing voltage-current double closed-loop control, and outputting modulated wave voltages of a d axis and a q axis.
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| CN114678898B (en) * | 2022-05-26 | 2022-08-26 | 哈尔滨工业大学 | Virtual voltage compensation method and device under micro-grid |
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| US7239035B2 (en) * | 2005-11-18 | 2007-07-03 | General Electric Company | System and method for integrating wind and hydroelectric generation and pumped hydro energy storage systems |
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| CN108448644A (en) * | 2017-02-16 | 2018-08-24 | 中国电力科学研究院 | A kind of control method and system of battery energy storage system virtual synchronous generator |
| CN106684921B (en) * | 2017-03-20 | 2019-08-02 | 重庆大学 | Inverter frequency modulation frequency modulation control circuit based on virtual synchronous generator |
| CN107465189A (en) * | 2017-08-21 | 2017-12-12 | 上海电力学院 | Virtual synchronous generator control method based on adaptive rotary inertia |
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