CN109830988B - Virtual synchronization control method and system for V2G system - Google Patents
Virtual synchronization control method and system for V2G system Download PDFInfo
- Publication number
- CN109830988B CN109830988B CN201910134202.8A CN201910134202A CN109830988B CN 109830988 B CN109830988 B CN 109830988B CN 201910134202 A CN201910134202 A CN 201910134202A CN 109830988 B CN109830988 B CN 109830988B
- Authority
- CN
- China
- Prior art keywords
- inverter
- given value
- current
- output
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The invention discloses a virtual synchronization control method and a virtual synchronization control system for a V2G system, wherein the method comprises the following steps: obtaining an active given value and a reactive given value from a power grid side, and obtaining the output power of an inverter according to the output current and voltage of the inverter; outputting a given value of q-axis current through reactive power control and voltage droop control; outputting a given value of d-axis current through active power regulation and a rotor motion equation; the invention has the beneficial effects that: the invention enables the inverter power supply to generate a response similar to a synchronous machine in the transient process, so that the inverter power supply generates external characteristics similar to those of a synchronous generator, and the virtual inertia of the system is improved.
Description
Technical Field
The invention relates to the technical field of virtual synchronization control, in particular to a virtual synchronization control method and system for a V2G system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In recent years, new energy vehicles are becoming popular, and among them, the increasing number is most considerable. The energy storage potential of the huge battery of the electric automobile is brought along, and the battery is applied to an active power distribution network, so that the stability of the voltage and the frequency of a power grid is greatly facilitated, and huge economic benefits are generated.
V2G, abbreviated as Vehicle-to-grid, describes a system for transferring battery energy to the grid when a hybrid or electric Vehicle is not in operation, and conversely, for drawing power from the grid when the Vehicle battery needs to be fully charged.
The prevalence of V2G inevitably results in the access of converters containing a large number of power electronics, which are generally too fast to respond and do not have the rotating inertia and damping characteristics of a synchronous generator. When the grid side power demand fluctuates, the inverter composed of power electronics lacks the inertia regulation similar to a synchronous generator, which can cause instability of the V2G system. Compared with the synchronous generator of the traditional power system, the inverter under the common P/Q control, U/f control and droop control has difficulty in providing the rotation inertia and the droop characteristic which are crucial to the stability of the power grid.
The virtual synchronous machine technology improves the control strategy of the inverter by researching the mechanical structure and the working characteristic of the synchronous generator, so that the inverter power supply generates a response similar to the synchronous machine in the transient process, the external characteristic similar to the synchronous generator is generated, and the virtual inertia of the system is improved.
The inventor finds that the control strategy of the virtual synchronous motor technology disclosed in the prior art applied to the microgrid is the modification of a control circuit on the basis of common virtual synchronization, and the control object and the control loop thereof are not greatly modified, so that the virtual synchronous motor technology is not suitable for the V2G system of the electric automobile participating in the frequency modulation and voltage regulation of the large power grid.
Disclosure of Invention
The invention provides a virtual synchronous control method and a virtual synchronous control system for a V2G system, which are used for controlling an inverter connected between an electric automobile and a power grid, omits the simulation of the output voltage of the inverter and the simulation of a stator electrical equation in the common virtual synchronous control, simplifies the three-loop control into double-loop control, and improves the reliability of the control.
In order to achieve the purpose, the invention adopts the following technical scheme:
disclosed in one or more embodiments is a virtual synchronization control method for a V2G system, including:
obtaining an active given value and a reactive given value from a power grid side, and obtaining the output power of an inverter according to the output current and voltage of the inverter;
outputting a given value of q-axis current through reactive power control and voltage droop control;
outputting a given value of d-axis current through active power regulation and a rotor motion equation;
the given value of the q-axis current and the current component of the actual current output by the inverter on the q axis are differentiated, and the given value of the d-axis current and the current component of the actual current output by the inverter on the d axis are differentiated;
and generating a PWM control signal for controlling the power switch of the inverter after the differentiated current is subjected to dq conversion.
Further, the output of the given value of the q-axis current through the reactive power control and the voltage droop control specifically comprises:
multiplying the difference between the given reactive value obtained from the power grid side and the reactive power output by the inverter by a proportionality coefficient KqTo obtain Vqref1；
Obtaining an inverter output voltage given value through droop control, wherein the difference value of the voltage given value and the inverter output voltage is multiplied by a proportionality coefficient KvTo obtain Vqref2；
To Vqref1And Vqref2The sum is integrated, and then the given value of the q-axis current is output through PI regulation.
Further, the outputting the given value of the d-axis current through active power regulation and a rotor motion equation specifically comprises:
and inputting a difference value delta P between an active given value obtained from the power grid side and the inverter output active power into a rotor motion equation to obtain a power grid angular frequency omega, and obtaining delta omega after the difference is made between the power grid angular frequency and the given value of the power grid angular frequency, wherein the delta omega outputs a given value of d-axis current through PI regulation.
Further, the rotor motion equation is specifically:
wherein J and D are the moment of inertia and the damping coefficient of the synchronous generator, respectively.
Disclosed in one or more embodiments is a virtual synchronization control system for a V2G system, comprising:
the device is used for obtaining an active given value and a reactive given value from the side of the power grid;
the device is used for collecting the output current and voltage of the inverter and calculating the output power of the inverter;
means for outputting a q-axis current setpoint by reactive power control and voltage droop control;
the device is used for outputting a d-axis current set value through active power regulation and a rotor motion equation;
means for subtracting a given value of the q-axis current from a current component of the actual current output by the inverter on the q-axis;
means for subtracting a given value of the d-axis current from a current component of the actual current output by the inverter on the d-axis;
means for dq converting the differenced current;
means for generating PWM control signals for controlling inverter power switches.
In one or more embodiments, a virtual synchronization control system for a V2G system includes a server including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the virtual synchronization control method for the V2G system when executing the computer program.
A computer-readable storage medium is disclosed in one or more embodiments, on which a computer program is stored, which, when executed by a processor, performs the above-described virtual synchronization control method for the V2G system.
Compared with the prior art, the invention has the beneficial effects that:
the invention enables the inverter power supply to generate a response similar to a synchronous machine in the transient process, so that the inverter power supply generates external characteristics similar to those of a synchronous generator, and the virtual inertia of the system is improved.
The invention omits the simulation of the output voltage of the inverter in the common virtual synchronous control, simplifies the P/Q-U-I three-loop control into the P/Q-I two-loop control and improves the reliability of the control.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic diagram illustrating a virtual synchronization control method for a V2G system according to a first embodiment;
FIG. 2 is a diagram illustrating a virtual synchronization control method in the prior art;
FIG. 3(a) is a schematic structural diagram of a V2G system;
FIG. 3(b) is a diagram illustrating the relationship between the V2G system and the vectors in the dq coordinate system in the first embodiment;
FIGS. 4(a) - (b) are the comparison of the output active power and reactive power for a given change in grid side power under PQ control and the embodiment of the present invention, respectively;
FIGS. 5(a) - (d) are the comparison of the output active power at different inertia coefficient and damping coefficient for a given fluctuation of power under the control of the embodiment of the present invention;
wherein, 1, reactive power-voltage droop control, 2, active power regulation-rotor motion equation part, and 3, current inner loop control.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
The common virtual synchronization control strategy shown in fig. 2 mainly includes the following steps: simulating mechanical torque T by P/omegam，PrefSimulating electromagnetic torque T by omegaeIn combination with the equation of the rotor of the synchronous machine
And finishing active power control, and integrating the obtained omega to obtain a phase angle difference value theta between the output end voltage of the simulated synchronous machine and the power grid voltage. And the reactive part obtains the amplitude value E of the analog terminal voltage by utilizing droop control, gives the voltage output by the converter combining E and theta, then obtains the current given value, and compares the current given value with the actual current value to obtain a PWM control signal. The control method is controlled in a power/voltage/current three-loop mode, the control is complex, accurate control on the power cannot be achieved, the transformation angle of theta generated by the control method and applied to dq coordinate transformation also has a problem in theory, and the practicability is not high under the condition that an island state is not considered in a V2G system.
In view of the above problems, in one or more embodiments, a virtual synchronization control method for a V2G system is disclosed, as shown in fig. 1, including the following steps:
1) and acquiring the power grid information to obtain the expected given output active power and the expected given output reactive power of the inverter.
2) The voltage and the current output by the inverter are collected, and the active power and the reactive power output by the inverter in real time are calculated through a formula.
3) And respectively giving the real-time output active power and reactive power and the real-time output active power and reactive power given by the power grid, and respectively obtaining the given of d and q axes of output current through a synchronous motor rotor motion equation and reactive droop control.
4) And (4) subtracting the given output current from the actually acquired output current to generate a PWM modulation wave.
Referring to fig. 1, the control method of the present embodiment includes: reactive-voltage droop control 1, active regulation-rotor equation of motion section 2, and current inner loop control 3.
Obtaining the given reactive power and the given active power from the side of the power grid as Q in the control of reactive power-voltage drooprefAnd active regulation-P in the equation of motion part of the rotorref(ii) a The current and the voltage are collected from the output side of the inverter, and the reactive power Q and the active power P output by the inverter at the moment are obtained after formula calculation.
Through the given value of reactive control and the droop control output q axle electric current of voltage, specifically do:
multiplying the difference between the given reactive value obtained from the power grid side and the reactive power output by the inverter by a proportionality coefficient KqTo obtain Vqref1(ii) a Obtaining an inverter output voltage given value through droop control, wherein the difference value of the voltage given value and the inverter output voltage is multiplied by a proportionality coefficient KvTo obtain Vqref2；
To Vqref1And Vqref2The sum is integrated, and then the given value of the q-axis current is output through PI regulation.
Outputting a given value of d-axis current through active power regulation and a rotor motion equation, specifically:
and subtracting the active given value obtained from the power grid side from the inverter output active power to obtain delta P, inputting the delta P into a rotor motion equation to obtain power grid angular frequency omega, subtracting the power grid angular frequency from the given value of the power grid angular frequency to obtain delta omega, and regulating the delta omega by PI to output the given value of d-axis current.
After being added with the delta P, the delta omega feedback is input into a rotor motion equation
And obtaining a new power grid angular frequency to form closed-loop feedback and complete the simulation of the rotor equation of motion.
The given value of the q-axis current and the current component of the actual current output by the inverter on the q axis are differentiated, and the given value of the d-axis current and the current component of the actual current output by the inverter on the d axis are differentiated; and d, converting the differentiated current by dq to generate a PWM (pulse-width modulation) wave, and comparing the PWM wave with a carrier to obtain a control signal of the power switch of the inverter, thereby finishing the control of the inverter.
It should be noted that, the inverter may be selected from various common inverters, and the control strategy of the embodiment may be used to control the inverter connected between the electric vehicle and the power grid.
The principle of the control method of the present embodiment is explained below on the basis of the system diagram and vector relationship of fig. 3(a) - (b):
the parts of the V2G system are shown in FIG. 3(a), and the inverter can be selected from various common inverters. The converter ac-side voltage-current vector relationship is shown in fig. 3(b), where X is ac-side impedance, and since inductance is much larger than resistance, X is ω L when the resistance is neglected;
for the three-phase output voltage vector of the converter,
is a three-phase alternating voltage vector of the network side;
is a converter AC side current vector; is composed of
And
the included angle between them; voltage vector
Rotating counterclockwise at an angular velocity ω, voltage vector
At an angular velocity ω*Rotating anticlockwise; when the system is in steady state operation, the value of omega is omega*. Suppose to
The direction is a d axis, the phase position is advanced by the d axis by 90 degrees to be a q axis, and a dq coordinate system is established.
The voltage vector relationship of the converter can be obtained as follows:
from the vector relationship in fig. 3(b), and using the similar triangle property, we can obtain:
the component of the grid-connected current in the dq coordinate system can be obtained as follows:
in general, the voltage drop across the inductor L is small,
→ 0, it is known that,
further can find Id、IqIs approximated by
Output voltage vector of grid-connected converter
Rotating and net side voltage vector according to angular frequency omega of converter
According to the grid angular frequency omega*Rotation, vector
Sum vector
The included angle of (d) can be expressed as:
＝∫(ω-ω*)dt；
in the control
The frequency difference can be regarded as a constant, and then the frequency difference is multiplied by a certain proportionality coefficient through an integral element to be used as an instruction of a d-axis current component of the converter, and the d-axis current component is converted into a frequency domain, namely:
in order to improve stability, a PI element is used to replace an integral element, and then the current instruction of the current loop can be expressed as:
and in the rotor equation of motion:
combining the above equation with the rotor equation of motion, and ω*Can be obtained from the net side, the d axis of the current loop can be given and the active power can be given through omega and omega*Are linked together.
Can see thatqIn relation to the amplitude of the output voltage, then q-axis giving of current can use reactive-amplitude droop control:
E＝U+n(Qref-Q)；
the given output voltage can be obtained through droop control, and I can be obtained through PI regulationqFor the purpose of enabling the reactive power output to have certain inertia, an integral link is added in the transfer function. Through the control of the link, the q-axis setting of the current is linked with the reactive setting, so that the reactive droop control can be realized, and certain inertia is possessed.
Iq *＝K1(E-U)+K2(Qref-Q)；
The q-axis setpoint of the current is then linked to the reactive setpoint, in the actual control, I, in order to make the reactive power regulation likewise possess a certain inertiaqIs preceded by an integration element.
The control scheme of the embodiment comprises three parts, namely reactive power-voltage droop control 1, active regulation-rotor motion equation part 2 and current inner loop control 3, wherein active and reactive power setting is obtained from the power grid side and is respectively used as P of the active regulation-rotor motion equation part 2 and the reactive power-voltage droop control 1refAnd QrefFrom the contraryThe current and voltage are collected at the output side of the inverter, and the power output by the inverter at the moment, namely P and Q in the reactive power-voltage droop control 1 and the active regulation-rotor motion equation part 2, are obtained after formula calculation.
In the reactive-voltage droop control part, a given value is output through the reactive-droop control 1 and is given as a q axis of current in the current inner loop control.
In the active power regulation-rotor equation part 2, P is calculatedrefAnd the ratio of P to the angular frequency omega of the power grid is used as electromagnetic torque and mechanical torque, and a given value is output through a rotor motion equation in the active power regulation-rotor motion equation part and is used as a d-axis given value of current in current inner loop control.
In the current inner loop control part 3, the current given obtained by the reactive-voltage droop control part 1 and the active regulation-rotor motion equation part 2 is subtracted from the actual current output by the inverter, the obtained current error is converted by dq, PWM modulation waves are generated, and the PWM modulation waves are compared with carrier waves to obtain control signals of power switches of the inverter, so that the control of the inverter is completed.
Example two
Disclosed in one or more embodiments is a virtual synchronization control system for a V2G system, comprising:
the device is used for obtaining an active given value and a reactive given value from the side of the power grid;
the device is used for collecting the output current and voltage of the inverter and calculating the output power of the inverter;
means for outputting a q-axis current setpoint by reactive power control and voltage droop control;
the device is used for outputting a d-axis current set value through active power regulation and a rotor motion equation;
means for subtracting a given value of the q-axis current from a current component of the actual current output by the inverter on the q-axis;
means for subtracting a given value of the d-axis current from a current component of the actual current output by the inverter on the d-axis;
means for dq converting the differenced current;
means for generating PWM control signals for controlling inverter power switches.
EXAMPLE III
In one or more embodiments, a virtual synchronization control system for a V2G system is disclosed, comprising a server including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the virtual synchronization control method for the V2G system as described in the first embodiment.
In one or more embodiments, a computer-readable storage medium is disclosed, on which a computer program is stored, which, when executed by a processor, performs the virtual synchronization control method for the V2G system described in the first embodiment.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (7)
1. A virtual synchronization control method for a V2G system, comprising:
obtaining an active given value and a reactive given value from a power grid side, and obtaining the output power of an inverter according to the output current and voltage of the inverter;
outputting a given value of q-axis current through reactive power control and voltage droop control;
outputting a given value of d-axis current through active power regulation and a rotor motion equation;
the given value of the q-axis current and the current component of the actual current output by the inverter on the q axis are differentiated, and the given value of the d-axis current and the current component of the actual current output by the inverter on the d axis are differentiated;
and generating a PWM control signal for controlling the power switch of the inverter after the differentiated current is subjected to dq conversion.
2. The virtual synchronous control method for the V2G system according to claim 1, wherein the output of the given value of the q-axis current through the reactive power control and the voltage droop control is specifically:
multiplying the difference between the given reactive value obtained from the power grid side and the reactive power output by the inverter by a proportionality coefficient KqTo obtain Vqref1；
Obtaining an inverter output voltage given value through droop control, wherein the difference value of the voltage given value and the inverter output voltage is multiplied by a proportionality coefficient KvTo obtain Vqref2；
To Vqref1And Vqref2The sum is integrated, and then the given value of the q-axis current is output through PI regulation.
3. The virtual synchronous control method for the V2G system according to claim 1, wherein the given value of d-axis current is output through active power regulation and a rotor motion equation, and specifically comprises:
and inputting a difference value delta P between an active given value obtained from the power grid side and the inverter output active power into a rotor motion equation to obtain a power grid angular frequency omega, and obtaining delta omega after the difference is made between the power grid angular frequency and the given value of the power grid angular frequency, wherein the delta omega outputs a given value of d-axis current through PI regulation.
4. The virtual synchronization control method for the V2G system according to claim 3, wherein the rotor motion equation is specifically as follows:
wherein J and D are the moment of inertia and the damping coefficient of the synchronous generator, respectively.
5. A virtual synchronization control system for a V2G system, comprising:
the device is used for obtaining an active given value and a reactive given value from the side of the power grid;
the device is used for collecting the output current and voltage of the inverter and calculating the output power of the inverter;
means for outputting a q-axis current setpoint by reactive power control and voltage droop control;
the device is used for outputting a d-axis current set value through active power regulation and a rotor motion equation;
means for subtracting a given value of the q-axis current from a current component of the actual current output by the inverter on the q-axis;
means for subtracting a given value of the d-axis current from a current component of the actual current output by the inverter on the d-axis;
means for dq converting the differenced current;
means for generating PWM control signals for controlling inverter power switches.
6. A virtual synchronization control system for a V2G system, comprising a server including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the virtual synchronization control method for the V2G system as recited in any one of claims 1 to 4 when executing the program.
7. A computer-readable storage medium on which a computer program is stored, the program being characterized by executing the virtual synchronization control method for the V2G system according to any one of claims 1 to 4 when executed by a processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910134202.8A CN109830988B (en) | 2019-02-22 | 2019-02-22 | Virtual synchronization control method and system for V2G system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910134202.8A CN109830988B (en) | 2019-02-22 | 2019-02-22 | Virtual synchronization control method and system for V2G system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109830988A CN109830988A (en) | 2019-05-31 |
| CN109830988B true CN109830988B (en) | 2020-11-24 |
Family
ID=66864264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910134202.8A Active CN109830988B (en) | 2019-02-22 | 2019-02-22 | Virtual synchronization control method and system for V2G system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109830988B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953686B (en) * | 2014-03-24 | 2017-02-22 | 国家电网公司 | Control method for charge-discharge virtual synchronization motor for electromobile energy storage |
| CN104901322B (en) * | 2015-05-22 | 2017-04-19 | 国家电网公司 | Current transformer virtual synchronization control system under asymmetric power grid voltage and method thereof |
| CN106208159B (en) * | 2016-07-27 | 2018-09-18 | 合肥工业大学 | Bavin storage mixing independent micro-grid dynamic power compensation method based on virtual synchronous generator |
| CN107196318B (en) * | 2017-04-17 | 2020-02-07 | 华北电力大学 | V2G technology-based electric vehicle participation power grid frequency modulation control method |
| CN107591834A (en) * | 2017-08-01 | 2018-01-16 | 华北电力大学（保定） | Based on the group string data of virtual synchronous machine without energy storage photovoltaic generating system control method |
| CN108879893A (en) * | 2017-09-29 | 2018-11-23 | 国网上海市电力公司 | A kind of electric car virtual synchronous motor fast charge method based on quasi- PR control |
-
2019
- 2019-02-22 CN CN201910134202.8A patent/CN109830988B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109830988A (en) | 2019-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107968591B (en) | Grid-connected inverter virtual inertia power decoupling control method based on common point voltage prediction | |
| Wang et al. | An improved deadbeat control method for single-phase PWM rectifiers in charging system for EVs | |
| WO2015166613A1 (en) | Power conversion device connected to single-phase system | |
| CN103066876B (en) | Inverter controller with synchronous generator characteristic | |
| He et al. | Linear active disturbance rejection control for three-phase voltage-source PWM rectifier | |
| CN107887919B (en) | Distributed energy storage inverter coordination control method and system | |
| Pichan et al. | Fuzzy-based direct power control of doubly fed induction generator-based wind energy conversion systems | |
| Akel et al. | A DQ rotating frame reactive power controller for single-phase bi-directional converters | |
| Benbouhenni | Intelligence indirect vector control of a DFIG based wind turbines | |
| CN109830988B (en) | Virtual synchronization control method and system for V2G system | |
| Shah et al. | Direct power control of grid-connected DFIG using variable gain super-twisting sliding mode controller for wind energy optimization | |
| dos Santos et al. | Wind power system connected to the grid from Squirrel Cage Induction Generator (SCIG) | |
| CN111313401B (en) | Off-vehicle charge and discharge control system and method based on Hamiltonian control principle | |
| Karthikeyan et al. | Feedback linearization control based power control of grid connected DFIG with grid synchronization | |
| CN109004680B (en) | Wind power plant power control method and system based on energy storage inverter | |
| CN106788094A (en) | A kind of Direct Torque Control algorithm for suppressing DC capacitor voltage fluctuation | |
| Mahdavi et al. | Design and implementation of a simple diesel generator emulator for frequency analysis of laboratory-scale microgrids | |
| Zulkifli et al. | Linear generator models in simulink block | |
| Ruiz et al. | Real-time sliding mode control for a doubly fed induction generator | |
| Naguru et al. | Comparative study of power control of DFIG using PI control and FeedBack Linearization Control | |
| Pradhan et al. | Robust adaptive position observer for multimode wind-BES based microgrid interfaced to distribution network | |
| Xie et al. | Modeling and Simulation of Mechanical and Electrical Transient of Variable-Speed Pumped Storage Units | |
| Peng et al. | Dynamic behavior of doubly fed induction generator wind turbines under three-phase voltage dips | |
| Min et al. | Control Strategy of Doubly-Fed Induction Generators Based on Stator Virtual Impedance in Microgrid | |
| Fan et al. | Modeling and state-space feedback design of the battery current controller for the energy stored quasi-Z-source inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |