CN116388214A - Method and device for setting control parameters of grid-structured converter - Google Patents

Method and device for setting control parameters of grid-structured converter Download PDF

Info

Publication number
CN116388214A
CN116388214A CN202211105963.9A CN202211105963A CN116388214A CN 116388214 A CN116388214 A CN 116388214A CN 202211105963 A CN202211105963 A CN 202211105963A CN 116388214 A CN116388214 A CN 116388214A
Authority
CN
China
Prior art keywords
control parameter
constraint
converter
loop control
transfer function
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.)
Pending
Application number
CN202211105963.9A
Other languages
Chinese (zh)
Inventor
赵伟
谢小荣
李付强
刘朋印
潘艳
张晶
徐鹏
董烨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tsinghua University
North China Grid Co Ltd
Original Assignee
Tsinghua University
North China Grid Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tsinghua University, North China Grid Co Ltd filed Critical Tsinghua University
Priority to CN202211105963.9A priority Critical patent/CN116388214A/en
Publication of CN116388214A publication Critical patent/CN116388214A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H02J3/241—The oscillation concerning frequency
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
    • G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Evolutionary Computation (AREA)
  • Medical Informatics (AREA)
  • Software Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

The application discloses a method and a device for setting control parameters of a grid-formed converter, wherein the method comprises the following steps: solving a closed loop transfer function of a first current control link, obtaining inequality constraint which is required to be met by an active-frequency outer loop control parameter under a preset stability requirement by using a Lawster criterion, and solving the inequality constraint under a preset dynamic performance requirement to set the active-frequency outer loop control parameter; solving a closed loop transfer function of the second current control link to set reactive power-voltage outer loop control parameters; determining a parameter selection range of the virtual inductor and the virtual resistor according to the current transformer inductance so as to set virtual impedance control parameters; and solving a closed loop transfer function of a third current control link, and solving an equation constraint which is required to be met by the current inner loop control parameter under the preset dynamic performance requirement so as to set the current inner loop control parameter. Therefore, the technical problems that in the related art, the efficiency of parameter setting based on experience or trial and error is low, and optimal control parameters are difficult to find are solved.

Description

Method and device for setting control parameters of grid-structured converter
Technical Field
The application relates to the technical field of power system analysis and control, in particular to a method and a device for setting control parameters of a grid-built converter.
Background
The power system has obvious 'high-proportion power electronics' characteristics on the power transmission, distribution and power utilization sides, and the grid-connected strategy of the power electronic converter is generally divided into a follow-grid type and a grid-structured type. The follow-up control strategy is provided earlier, and is widely applied to an electric power system, but the follow-up control depends on a phase-locked loop to track the voltage phase of a power grid, so that the electromagnetic oscillation problem is easy to occur under the condition of weak power grid; and the following net type control does not have the inertia characteristic of the traditional synchronous machine set.
In order to solve the problems, a network-structured control strategy is proposed in some researches, and the strategy does not depend on a phase-locked loop, can establish voltage and frequency, and has good stability in a weak power grid. A typical strategy in the network-structured control strategy is virtual synchronous machine control simulating a traditional synchronous machine rotor motion equation.
At present, researches on the grid-structured converter mainly concentrate on analyzing and improving the control performance of the grid-structured converter, and researches on parameter setting are less, in the related technology, parameter setting can be carried out based on experience or trial and error, so that the setting efficiency is low, optimal control parameters are difficult to find, the balance between stability and control dynamic performance cannot be realized, and the improvement is needed.
Disclosure of Invention
The application provides a method and a device for setting control parameters of a grid-connected converter, which are used for solving the technical problems that in the related art, parameter setting is carried out based on experience or trial and error, setting efficiency is low, optimal control parameters are difficult to find, and stability and control dynamic performance are compatible.
An embodiment of a first aspect of the present application provides a method for setting control parameters of a grid-connected converter, including the following steps: solving a closed loop transfer function of a first current control link, obtaining inequality constraint which is required to be met by an active-frequency outer loop control parameter under a preset stability requirement by utilizing a Lawster criterion, and solving the inequality constraint which is required to be met by the active-frequency outer loop control parameter under a preset dynamic performance requirement so as to set the active-frequency outer loop control parameter; solving a closed loop transfer function of a second current control link, and obtaining inequality constraint which is required to be met by the reactive-voltage outer loop control parameter under the preset stability requirement by utilizing the Lawster criterion so as to set the reactive-voltage outer loop control parameter; determining a parameter selection range of the virtual inductor and the virtual resistor according to the current transformer inductance so as to set virtual impedance control parameters; and solving a closed loop transfer function of a third current control link, obtaining inequality constraint which is required to be met by the current inner loop control parameter under the preset stability requirement by utilizing the Lawster criterion, and solving equality constraint which is required to be met by the current inner loop control parameter under the preset dynamic performance requirement so as to set the current inner loop control parameter.
Optionally, in an embodiment of the present application, the closed loop transfer function of the first current control link is:
Figure BDA0003838621590000021
wherein U is the outlet voltage of the converter, E q Outputting a voltage for a switching device of a current transformer，T J Is equivalent to the inertia time constant, D p Is a first damping coefficient, K f For frequency adjustment of the effect coefficient, X s And s is Laplacian, which is the total reactance of the converter.
Optionally, in an embodiment of the present application, the inequality constraint that the active-frequency outer loop control parameter should satisfy includes:
first stability constraint:
Figure BDA0003838621590000022
and, a first dynamic performance constraint:
Figure BDA0003838621590000023
wherein ζ is the second damping coefficient.
Optionally, in an embodiment of the present application, the closed loop transfer function of the second current control link is:
Figure BDA0003838621590000024
wherein K is pQ And K iQ The proportional and integral gains of the PI link in the reactive-voltage outer loop control link.
Optionally, in one embodiment of the present application, the second stability constraint that the reactive-voltage outer loop control parameter should meet is:
Figure BDA0003838621590000025
optionally, in an embodiment of the present application, the closed loop transfer function of the third current control link is:
Figure BDA0003838621590000026
Figure BDA0003838621590000027
wherein K is pd 、K id 、K pq And K iq Proportional and integral gain, T of PI control link d For the power electronic switch action time, R and L are respectively a converter resistor and an inductor.
Optionally, in one embodiment of the present application, the equation constraint that the current inner loop control parameter should satisfy includes:
third stability constraint:
Figure BDA0003838621590000028
and, a second dynamic performance constraint:
Figure BDA0003838621590000031
an embodiment of a second aspect of the present application provides a control parameter setting device for a grid-structured converter, including: the first calculation module is used for solving a closed loop transfer function of a first current control link, obtaining inequality constraint which is required to be met by the active-frequency outer loop control parameter under the preset stability requirement by utilizing a Lawster criterion, and solving the inequality constraint which is required to be met by the active-frequency outer loop control parameter under the preset dynamic performance requirement so as to set the active-frequency outer loop control parameter; the second calculation module is used for solving a closed loop transfer function of a second current control link, and obtaining inequality constraint which is required to be met by the reactive-voltage outer loop control parameter under the preset stability requirement by utilizing the Lawster criterion so as to set the reactive-voltage outer loop control parameter; the determining module is used for determining the parameter selection range of the virtual inductor and the virtual resistor according to the converter inductance so as to set the virtual impedance control parameter; and the third calculation module is used for solving a closed loop transfer function of a third current control link, obtaining inequality constraint which is required to be met by the current inner loop control parameter under the preset stability requirement by utilizing the Lawster criterion, and solving equality constraint which is required to be met by the current inner loop control parameter under the preset dynamic performance requirement so as to set the current inner loop control parameter.
Optionally, in an embodiment of the present application, the closed loop transfer function of the first current control link is:
Figure BDA0003838621590000032
wherein U is the outlet voltage of the converter, E q For outputting voltage, T for converter switching device J Is equivalent to the inertia time constant, D p Is a first damping coefficient, K f For frequency adjustment of the effect coefficient, X s And s is Laplacian, which is the total reactance of the converter.
Optionally, in an embodiment of the present application, the inequality constraint that the active-frequency outer loop control parameter should satisfy includes:
first stability constraint:
Figure BDA0003838621590000033
and, a first dynamic performance constraint:
Figure BDA0003838621590000034
wherein ζ is the second damping coefficient.
Optionally, in an embodiment of the present application, the closed loop transfer function of the second current control link is:
Figure BDA0003838621590000035
wherein K is pQ And K iQ The proportional and integral gains of the PI link in the reactive-voltage outer loop control link.
Optionally, in one embodiment of the present application, the second stability constraint that the reactive-voltage outer loop control parameter should meet is:
Figure BDA0003838621590000041
optionally, in an embodiment of the present application, the closed loop transfer function of the third current control link is:
Figure BDA0003838621590000042
Figure BDA0003838621590000043
wherein K is pd 、K id 、K pq And K iq Proportional and integral gain, T of PI control link d For the power electronic switch action time, R and L are respectively a converter resistor and an inductor.
Optionally, in one embodiment of the present application, the equation constraint that the current inner loop control parameter should satisfy includes:
third stability constraint:
Figure BDA0003838621590000044
and, a second dynamic performance constraint:
Figure BDA0003838621590000045
an embodiment of a third aspect of the present application provides an electronic device, including: the system comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the program to realize the method for setting the control parameters of the grid-connected converter according to the embodiment.
A fourth aspect of the present application provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements a grid-built converter control parameter tuning method as above.
According to the embodiment of the application, the converter can be provided with the inertia damping characteristic of the synchronous generator by simulating the mechanical and electromagnetic parts of the synchronous generator, and the overall dynamic performance of the control link is improved as much as possible and the setting efficiency is improved on the premise of meeting the stability requirement through the setting of the active-frequency outer ring control parameter, the setting of the reactive-voltage outer ring control parameter, the setting of the virtual impedance control parameter and the setting of the current inner ring control parameter. Therefore, the technical problems that in the related art, parameter setting is carried out based on experience or trial and error, the setting efficiency is low, and optimal control parameters are difficult to find, so that stability and control dynamic performance are both achieved are solved.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a flowchart of a method for setting control parameters of a grid-structured converter according to an embodiment of the present application;
fig. 2 is a schematic diagram of a method for setting control parameters of a grid-structured converter according to an embodiment of the present application;
FIG. 3 is a flow chart of a method of tuning control parameters of a networked converter according to one embodiment of the present application;
fig. 4 is a schematic structural diagram of a control parameter setting device of a grid-structured converter according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
The following describes a method and a device for setting control parameters of a grid-built converter according to an embodiment of the present application with reference to the accompanying drawings. Aiming at the technical problems that in the related technology mentioned in the background technology center, parameter setting is carried out based on experience or trial and error, the setting efficiency is low, and optimal control parameters are difficult to find so as to achieve the balance between stability and control dynamic performance, the application provides a grid-built converter control parameter setting method. Therefore, the technical problems that in the related art, parameter setting is carried out based on experience or trial and error, the setting efficiency is low, and optimal control parameters are difficult to find, so that stability and control dynamic performance are both achieved are solved.
Specifically, fig. 1 is a schematic flow chart of a method for setting control parameters of a grid-structured converter according to an embodiment of the present application.
As shown in fig. 1, the method for setting control parameters of the grid-structured converter comprises the following steps:
in step S101, the closed loop transfer function of the first current control link is solved, and the inequality constraint that the active-frequency outer loop control parameter should satisfy under the preset stability requirement is obtained by using the us criterion, and the inequality constraint that the active-frequency outer loop control parameter should satisfy under the preset dynamic performance requirement is solved, so as to set the active-frequency outer loop control parameter.
In the actual execution process, the embodiment of the application can solve the closed loop transfer function of the first current control link, and then obtain the inequality constraint which is required to be met by the control parameter under the preset stability requirement by utilizing the Lawster criterion, so as to solve the inequality constraint which is required to be met by the control parameter under the dynamic performance requirement, and further realize the setting of the active-frequency outer loop control parameter on the premise of meeting the stability.
The predetermined stability requirement is described below.
Optionally, in one embodiment of the present application, the closed loop transfer function of the first current control element is:
Figure BDA0003838621590000061
wherein U is the outlet voltage of the converter, E q For outputting voltage, T for converter switching device J Is equivalent to the inertia time constant, D p Is a first damping coefficient, K f For frequency adjustment of the effect coefficient, X s And s is Laplacian, which is the total reactance of the converter.
Specifically, in the embodiment of the present application, it may be assumed that the output resistance of the converter is far smaller than the reactance, that is, the resistance value is negligible, and the total reactance of the converter may be X s The active power P output by the converter (considering both the actual access impedance and the virtual impedance) may be:
Figure BDA0003838621590000062
wherein U is the outlet voltage of the converter, E q The voltage is output by the converter switching device, and delta is the phase angle difference of the two voltages.
The embodiment of the application can obtain according to the transfer function of the active-frequency outer loop control:
Figure BDA0003838621590000063
wherein T is J 、D p And K f The equivalent inertia time constant, the first damping coefficient and the frequency adjustment effect coefficient are respectively.
For active-frequency control, its open loop transfer function may be:
Figure BDA0003838621590000064
the closed loop transfer function of the first current control link may be:
Figure BDA0003838621590000065
optionally, in one embodiment of the present application, the inequality constraint that the active-frequency outer loop control parameter should satisfy includes:
first stability constraint:
Figure BDA0003838621590000066
and, a first dynamic performance constraint:
Figure BDA0003838621590000067
wherein ζ is the second damping coefficient.
Considering the stability of the system, that is, the poles of the closed loop transfer function are all distributed on the left half plane of the complex plane, the embodiment of the application can be based on the Lawster criterion:
Figure BDA0003838621590000068
wherein X is s U and E q The parameters are all positive, then the inequality can be further reduced to a first stability constraint:
Figure BDA0003838621590000071
considering its dynamic performance, the transfer function is typically a second order transfer function, and the second damping coefficient ζ may be:
Figure BDA0003838621590000072
when parameter adjustment is performed, in order to improve dynamic performance of a control link and reduce overshoot, the embodiment of the application may set a second damping coefficient ζ between 0.4 and 0.8, that is, a first dynamic performance constraint is:
Figure BDA0003838621590000073
in summary, the active-frequency outer loop control parameter under the stability requirement needs to satisfy the first stability constraint of the inequality; in order to ensure the dynamic performance of the control link, the control parameters also need to satisfy the first dynamic performance constraint of the inequality.
In step S102, the closed loop transfer function of the second current control link is solved, and the inequality constraint that the reactive-voltage outer loop control parameter should satisfy under the preset stability requirement is obtained by using the us criterion, so as to set the reactive-voltage outer loop control parameter.
As a possible implementation manner, the embodiment of the application can solve the closed loop transfer function of the second current control link, and then obtain the inequality constraint which should be met by the control parameter under the preset stability requirement by using the us criterion, so as to realize the setting of the reactive-voltage outer loop control parameter on the premise of meeting the stability.
The predetermined stability requirement is described below.
Optionally, in an embodiment of the present application, the closed loop transfer function of the second current control element is:
Figure BDA0003838621590000074
wherein K is pQ And K iQ The proportional and integral gains of the PI link in the reactive-voltage outer loop control link.
Specifically, the reactive power Q output by the converter may be:
Figure BDA0003838621590000075
wherein U is the outlet voltage of the converter, E q For outputting voltage, X, of converter switching device s And outputting reactance for the converter.
In view of reactive-voltage control, embodiments of the present application may yield a voltage deviation Δe:
Figure BDA0003838621590000076
wherein K is pQ And K iQ The proportional and integral gain of the PI link in the reactive power-voltage outer loop control link is adopted, and the delta Q is the reactive power disturbance component.
For the reactive-voltage control link, i.e. the closed loop transfer function of the second current control link is:
Figure BDA0003838621590000077
optionally, in one embodiment of the present application, the second stability constraint that the reactive-voltage outer loop control parameter should meet is:
Figure BDA0003838621590000081
in the actual implementation process, considering the system stability, the embodiment of the application can require that the closed loop poles are all distributed on the left half plane of the complex plane, and the closed loop poles are known according to the Lawster criterion:
Figure BDA0003838621590000082
wherein X is s And the U parameter is positive, the inequality can be further reduced to:
Figure BDA0003838621590000083
considering the dynamic performance, since the open loop transfer function of the reactive-voltage control link is a typical first order transfer function, no obvious overshoot component exists, and therefore, the control parameters of the embodiment of the application do not need to satisfy other constraints.
In summary, the reactive-voltage outer loop control parameters under the stability requirement and the dynamic performance requirement need to satisfy the inequality constraint.
In step S103, a parameter selection range of the virtual inductance and the virtual resistance is determined according to the converter inductance, so as to set the virtual impedance control parameter.
It can be understood that the virtual impedance control is equivalent to connecting an equivalent impedance in series with the output port of the converter, so that the output impedance of the converter can be flexibly adjusted.
The embodiment of the application can determine the virtual inductance L according to the converter inductance L V And virtual resistance R V Is used for selecting the range of parameters.
Wherein, in order to meet the stability requirement and improve the dynamic performance of the control link, the virtual inductance L V Can keep the same order of magnitude with the converter inductance L, the virtual resistance R V May be L V 10% of (C).
In step S104, the closed loop transfer function of the third current control link is solved, and the inequality constraint that the current inner loop control parameter should satisfy under the preset stability requirement is obtained by using the us criterion, and the equality constraint that the current inner loop control parameter should satisfy under the preset dynamic performance requirement is solved, so as to set the current inner loop control parameter.
In some embodiments, the embodiment of the application may solve a closed loop transfer function of the third current control link, obtain an inequality constraint that the control parameter should satisfy under a preset stability requirement by using a us criterion, and solve an equality constraint that the control parameter should satisfy under a preset dynamic performance requirement, so as to realize setting of the current inner loop control parameter under the premise of satisfying the stability.
The preset stability requirement and the preset dynamic performance requirement are described below.
Optionally, in an embodiment of the present application, the closed loop transfer function of the third current control element is:
Figure BDA0003838621590000084
Figure BDA0003838621590000085
wherein K is pd 、K id 、K pq And K iq Proportional and integral gain, T of PI control link d For the power electronic switch action time, R and L are respectively a converter resistor and an inductor.
Specifically, in designing the current closed-loop parameters, the embodiment of the application can assume that the d-axis and q-axis control is decoupled, and the open-loop transfer function H of the current controller i,d (s) and H i,q (s) may be defined as follows:
Figure BDA0003838621590000091
Figure BDA0003838621590000092
wherein K is pd 、K id 、K pq And K iq Proportional and integral gain, T of PI control link d For the power electronic switch action time, R and L are respectively a converter resistor and an inductor.
The closed loop transfer function of the third current control link is:
Figure BDA0003838621590000093
Figure BDA0003838621590000094
optionally, in one embodiment of the present application, the equation constraint that the current inner loop control parameter should satisfy includes:
third stability constraint:
Figure BDA0003838621590000095
and, a second dynamic performance constraint:
Figure BDA0003838621590000096
further, considering the stability of the system, the closed loop poles are required to be distributed on the left half plane of the complex plane, and the embodiment of the application can be known according to the Lawster criterion:
Figure BDA0003838621590000097
Figure BDA0003838621590000098
obviously, for the above formula, each parameter is positive, the first 4 inequalities are satisfied, and the stability requirement of the parameter design can be satisfied only by satisfying that the last inequality is satisfied in the embodiment of the present application, and R is usually very small, then the inequality can be further simplified into a third stability constraint:
Figure BDA0003838621590000101
according to the related knowledge of the automatic control principle, in order to improve the dynamic performance of the control system, the embodiment of the application can try to make the pole of the closed loop transfer function compensate the zero point, namely make the zero point close to the pole.
Thus, the active-frequency control parameter may satisfy a second dynamic performance constraint:
Figure BDA0003838621590000102
in summary, the current inner loop control parameter needs to satisfy the third stability constraint of the inequality under the stability requirement; in order to ensure the dynamic performance of the control link, the current inner loop control parameter also needs to satisfy the second dynamic performance constraint of the equation.
It should be understood that the arrangement of step S101 and step S104 is for descriptive convenience only and is not intended to limit the execution order of the method.
The working principle of the method for setting control parameters of the grid-connected converter according to the embodiment of the present application will be described in detail with reference to fig. 2 and 3.
As shown in fig. 2, the strategy for implementing the tuning of the control parameters of the grid-connected converter and the control parameters thereof according to the embodiment of the present application may include active-frequency outer loop control, reactive-voltage outer loop control, virtual impedance control, and current inner loop control.
As shown in fig. 3, an embodiment of the present application may include the following steps:
step S301: setting the active-frequency outer loop control parameters.
In the actual execution process, the embodiment of the application can solve the closed loop transfer function of the first current control link, and then obtain the inequality constraint which is required to be met by the control parameter under the preset stability requirement by utilizing the Lawster criterion, so as to solve the inequality constraint which is required to be met by the control parameter under the dynamic performance requirement, and further realize the setting of the active-frequency outer loop control parameter on the premise of meeting the stability.
The predetermined stability requirement is described below.
Specifically, in the embodiment of the present application, it may be assumed that the output resistance of the converter is far smaller than the reactance, that is, the resistance value is negligible, and the total reactance of the converter may be X s The active power P output by the converter (considering both the actual access impedance and the virtual impedance) may be:
Figure BDA0003838621590000103
wherein U is the outlet voltage of the converter, E q The voltage is output by the converter switching device, and delta is the phase angle difference of the two voltages.
The embodiment of the application can obtain according to the transfer function of the active-frequency outer loop control:
Figure BDA0003838621590000104
wherein T is J 、D p And K f The equivalent inertia time constant, the first damping coefficient and the frequency adjustment effect coefficient are respectively.
For active-frequency control, its open loop transfer function may be:
Figure BDA0003838621590000111
the closed loop transfer function of the first current control link may be:
Figure BDA0003838621590000112
considering the stability of the system, that is, the poles of the closed loop transfer function are all distributed on the left half plane of the complex plane, the embodiment of the application can be based on the Lawster criterion:
Figure BDA0003838621590000113
wherein X is s U and E q The parameters are all positive, then the inequality can be further reduced to a first stability constraint:
Figure BDA0003838621590000114
considering its dynamic performance, the transfer function is typically a second order transfer function, and the second damping coefficient ζ may be:
Figure BDA0003838621590000115
when parameter adjustment is performed, in order to improve dynamic performance of a control link and reduce overshoot, the embodiment of the application may set a second damping coefficient ζ between 0.4 and 0.8, that is, a first dynamic performance constraint is:
Figure BDA0003838621590000116
in summary, the active-frequency outer loop control parameter under the stability requirement needs to satisfy the first constraint of the inequality; in order to ensure the dynamic performance of the control link, the control parameters also need to satisfy the second constraint of the inequality.
Step S302: and setting reactive power-voltage outer loop control parameters.
As a possible implementation manner, the embodiment of the application can solve the closed loop transfer function of the second current control link, and then obtain the inequality constraint which is the second stability constraint and is to be met by the control parameter under the preset stability requirement by using the us criterion, so as to realize the setting of the reactive-voltage outer loop control parameter on the premise of meeting the stability.
The predetermined stability requirement is described below.
Specifically, the reactive power Q output by the converter may be:
Figure BDA0003838621590000117
wherein U is the outlet voltage of the converter, E q For outputting voltage, X, of converter switching device s And outputting reactance for the converter.
In view of reactive-voltage control, embodiments of the present application may yield a voltage deviation Δe:
Figure BDA0003838621590000118
wherein K is pQ And K iQ The proportional and integral gain of the PI link in the reactive power-voltage outer loop control link is adopted, and the delta Q is the reactive power disturbance component.
For the reactive-voltage control link, i.e. the closed loop transfer function of the second current control link is:
Figure BDA0003838621590000121
in the actual implementation process, considering the system stability, the embodiment of the application can require that the closed loop poles are all distributed on the left half plane of the complex plane, and the closed loop poles are known according to the Lawster criterion:
Figure BDA0003838621590000122
wherein X is s And the U parameter is positive, the inequality can be further reduced to:
Figure BDA0003838621590000123
considering the dynamic performance, since the open loop transfer function of the reactive-voltage control link is a typical first order transfer function, no obvious overshoot component exists, and therefore, the control parameters of the embodiment of the application do not need to satisfy other constraints.
In summary, the reactive-voltage outer loop control parameters under the stability requirement and the dynamic performance requirement need to satisfy the inequality constraint.
Step S303: setting the virtual impedance control parameters.
It can be understood that the virtual impedance control is equivalent to connecting an equivalent impedance in series with the output port of the converter, so that the output impedance of the converter can be flexibly adjusted.
The embodiment of the application can determine the virtual inductance L according to the converter inductance L V And virtual resistance R V Is used for selecting the range of parameters.
Wherein, in order to meet the stability requirement and improve the dynamic performance of the control link, the virtual inductance L V Can keep the same order of magnitude with the converter inductance L, the virtual resistance R V May be L V 10% of (C).
Step S304: and setting the current inner loop control parameter.
In some embodiments, the embodiment of the application may solve a closed loop transfer function of the third current control link, obtain an inequality constraint that the control parameter should satisfy under a preset stability requirement by using a us criterion, and solve an equality constraint that the control parameter should satisfy under a preset dynamic performance requirement, so as to realize setting of the current inner loop control parameter under the premise of satisfying the stability.
Specifically, in designing the current closed-loop parameters, the embodiment of the application can assume that the d-axis and q-axis control is decoupled, and the open-loop transfer function H of the current controller i,d (s) and H i,q (s) may be defined as follows:
Figure BDA0003838621590000124
Figure BDA0003838621590000125
wherein K is pd 、K id 、K pq And K iq Proportional and integral gain, T of PI control link d For the power electronic switch action time, R and L are respectively a converter resistor and an inductor.
The closed loop transfer function of the third current control link is:
Figure BDA0003838621590000131
Figure BDA0003838621590000132
further, considering the stability of the system, the closed loop poles are required to be distributed on the left half plane of the complex plane, and the embodiment of the application can be known according to the Lawster criterion:
Figure BDA0003838621590000133
Figure BDA0003838621590000134
obviously, for the above formula, each parameter is positive, the first 4 inequalities are satisfied, and the stability requirement of the parameter design can be satisfied only by satisfying that the last inequality is satisfied in the embodiment of the present application, and R is usually very small, then the inequality can be further simplified into a third stability constraint:
Figure BDA0003838621590000135
according to the related knowledge of the automatic control principle, in order to improve the dynamic performance of the control system, the embodiment of the application can try to make the pole of the closed loop transfer function compensate the zero point, namely make the zero point close to the pole.
Thus, the active-frequency control parameter may satisfy a second dynamic performance constraint:
Figure BDA0003838621590000136
in summary, the current inner loop control parameter needs to satisfy the third stability constraint of the inequality under the stability requirement; in order to ensure the dynamic performance of the control link, the current inner loop control parameter also needs to satisfy the second dynamic performance constraint of the equation.
It should be understood that the arrangement of step S301 and step S304 is for descriptive convenience only and is not intended to limit the execution order of the method.
According to the grid-structured converter control parameter setting method provided by the embodiment of the application, the converter can be provided with the inertia damping characteristic of the synchronous generator by simulating the mechanical and electromagnetic parts of the synchronous generator, and the overall dynamic performance of the control link is improved as much as possible on the premise of meeting the stability requirement through active-frequency outer loop control parameter setting, reactive-voltage outer loop control parameter setting, virtual impedance control parameter setting and current inner loop control parameter setting, so that the setting efficiency is improved. Therefore, the technical problems that in the related art, parameter setting is carried out based on experience or trial and error, the setting efficiency is low, and optimal control parameters are difficult to find, so that stability and control dynamic performance are both achieved are solved.
Next, a control parameter setting device of a grid-structured converter according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 4 is a schematic block diagram of a control parameter setting device of a grid-structured converter according to an embodiment of the present application.
As shown in fig. 4, the mesh-type converter control parameter setting device 10 includes: the first computing module 100, the second computing module 200, the determining module 300 and the third computing module 400.
Specifically, the first calculation module 100 is configured to solve a closed loop transfer function of the first current control link, obtain an inequality constraint that the active-frequency outer loop control parameter should satisfy under a preset stability requirement by using a us criterion, and solve the inequality constraint that the active-frequency outer loop control parameter should satisfy under a preset dynamic performance requirement to set the active-frequency outer loop control parameter.
The second calculation module 200 is configured to solve a closed loop transfer function of the second current control link, and obtain an inequality constraint that the reactive-voltage outer loop control parameter should meet under a preset stability requirement by using a us criterion, so as to set the reactive-voltage outer loop control parameter.
The determining module 300 is configured to determine a parameter selection range of the virtual inductance and the virtual resistance according to the converter inductance, so as to set the virtual impedance control parameter.
The third calculation module 400 is configured to solve a closed loop transfer function of the third current control link, obtain an inequality constraint that the current inner loop control parameter should satisfy under the preset stability requirement by using a us criterion, and solve an equality constraint that the current inner loop control parameter should satisfy under the preset dynamic performance requirement, so as to set the current inner loop control parameter.
Optionally, in one embodiment of the present application, the closed loop transfer function of the first current control element is:
Figure BDA0003838621590000141
wherein U is the outlet voltage of the converter, E q For outputting voltage, T for converter switching device J Is equivalent to the inertia time constant, D p Is a first damping coefficient, K f For frequency adjustment of the effect coefficient, X s And s is Laplacian, which is the total reactance of the converter.
Optionally, in one embodiment of the present application, the inequality constraint that the active-frequency outer loop control parameter should satisfy includes:
first stability constraint:
Figure BDA0003838621590000142
and, a first dynamic performance constraint:
Figure BDA0003838621590000143
wherein ζ is the second damping coefficient.
Optionally, in an embodiment of the present application, the closed loop transfer function of the second current control element is:
Figure BDA0003838621590000144
wherein X is pQ And K iQ The proportional and integral gains of the PI link in the reactive-voltage outer loop control link.
Optionally, in one embodiment of the present application, the second stability constraint that the reactive-voltage outer loop control parameter should meet is:
Figure BDA0003838621590000151
optionally, in an embodiment of the present application, the closed loop transfer function of the third current control element is:
Figure BDA0003838621590000152
Figure BDA0003838621590000153
wherein K is pd 、K id 、K pq And K iq Proportional and integral gain, T of PI control link d For the power electronic switch action time, R and L are respectively a converter resistor and an inductor.
Optionally, in one embodiment of the present application, the equation constraint that the current inner loop control parameter should satisfy includes:
third stability constraint:
Figure BDA0003838621590000154
and, a second dynamic performance constraint:
Figure BDA0003838621590000155
it should be noted that the foregoing explanation of the embodiment of the method for adjusting the control parameters of the grid-connected inverter is also applicable to the device for adjusting the control parameters of the grid-connected inverter of this embodiment, and will not be repeated here.
According to the grid-structured converter control parameter setting device provided by the embodiment of the application, the converter can be provided with the inertia damping characteristic of the synchronous generator by simulating the mechanical and electromagnetic parts of the synchronous generator, and the overall dynamic performance of the control link is improved as much as possible on the premise of meeting the stability requirement through active-frequency outer ring control parameter setting, reactive-voltage outer ring control parameter setting, virtual impedance control parameter setting and current inner ring control parameter setting, so that the setting efficiency is improved. Therefore, the technical problems that in the related art, parameter setting is carried out based on experience or trial and error, the setting efficiency is low, and optimal control parameters are difficult to find, so that stability and control dynamic performance are both achieved are solved.
Fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application. The electronic device may include:
memory 501, processor 502, and a computer program stored on memory 501 and executable on processor 502.
The processor 502 implements the method for setting the control parameters of the grid-connected converter provided in the above embodiment when executing the program.
Further, the electronic device further includes:
a communication interface 503 for communication between the memory 501 and the processor 502.
Memory 501 for storing a computer program executable on processor 502.
The memory 501 may include high-speed RAM memory and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
If the memory 501, the processor 502, and the communication interface 503 are implemented independently, the communication interface 503, the memory 501, and the processor 502 may be connected to each other via a bus and perform communication with each other. The bus may be an industry standard architecture (Industry Standard Architecture, abbreviated ISA) bus, an external device interconnect (Peripheral Component, abbreviated PCI) bus, or an extended industry standard architecture (Extended Industry Standard Architecture, abbreviated EISA) bus, among others. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 5, but not only one bus or one type of bus.
Alternatively, in a specific implementation, if the memory 501, the processor 502, and the communication interface 503 are integrated on a chip, the memory 501, the processor 502, and the communication interface 503 may perform communication with each other through internal interfaces.
The processor 502 may be a central processing unit (Central Processing Unit, abbreviated as CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, abbreviated as ASIC), or one or more integrated circuits configured to implement embodiments of the present application.
The embodiment of the application also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method for setting control parameters of a grid-built converter as described above.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "N" is at least two, such as two, three, etc., unless explicitly defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer cartridge (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (16)

1. The method for setting the control parameters of the grid-structured converter is characterized by comprising the following steps of:
solving a closed loop transfer function of a first current control link, obtaining inequality constraint which is required to be met by an active-frequency outer loop control parameter under a preset stability requirement by utilizing a Lawster criterion, and solving the inequality constraint which is required to be met by the active-frequency outer loop control parameter under a preset dynamic performance requirement so as to set the active-frequency outer loop control parameter;
solving a closed loop transfer function of a second current control link, and obtaining inequality constraint which is required to be met by the reactive-voltage outer loop control parameter under the preset stability requirement by utilizing the Lawster criterion so as to set the reactive-voltage outer loop control parameter;
determining a parameter selection range of the virtual inductor and the virtual resistor according to the current transformer inductance so as to set virtual impedance control parameters; and
and solving a closed loop transfer function of a third current control link, obtaining inequality constraint which is required to be met by the current inner loop control parameter under the preset stability requirement by utilizing the Lawster criterion, and solving equality constraint which is required to be met by the current inner loop control parameter under the preset dynamic performance requirement so as to set the current inner loop control parameter.
2. The method of claim 1, wherein the closed loop transfer function of the first current control element is:
Figure FDA0003838621580000011
wherein U is the outlet voltage of the converter, E q For outputting voltage, T for converter switching device J Is equivalent to the inertia time constant, D p Is a first damping coefficient, K f For frequency adjustment of the effect coefficient, X s And s is Laplacian, which is the total reactance of the converter.
3. The method of claim 2, wherein the inequality constraint that the active-frequency outer loop control parameter should satisfy comprises:
first stability constraint:
Figure FDA0003838621580000012
and, a first dynamic performance constraint:
Figure FDA0003838621580000013
wherein ζ is the second damping coefficient.
4. The method of claim 1, wherein the closed loop transfer function of the second current control loop is:
Figure FDA0003838621580000014
wherein K is pQ And K iQ The proportional and integral gains of the PI link in the reactive-voltage outer loop control link.
5. The method according to claim 4, characterized in that the second stability constraint that the reactive-voltage outer loop control parameter should meet is:
Figure FDA0003838621580000021
6. the method of claim 1, wherein the closed loop transfer function of the third current control loop is:
Figure FDA0003838621580000022
Figure FDA0003838621580000023
wherein K is pd 、K id 、K pq And K iq Proportional and integral gain, T of PI control link d For the power electronic switch action time, R and L are respectively a converter resistor and an inductor.
7. The method of claim 6, wherein the equality constraint that the current inner loop control parameter should satisfy comprises:
third stability constraint:
Figure FDA0003838621580000024
and, a second dynamic performance constraint:
Figure FDA0003838621580000025
8. the utility model provides a net formula converter control parameter setting device which characterized in that includes:
the first calculation module is used for solving a closed loop transfer function of a first current control link, obtaining inequality constraint which is required to be met by the active-frequency outer loop control parameter under the preset stability requirement by utilizing a Lawster criterion, and solving the inequality constraint which is required to be met by the active-frequency outer loop control parameter under the preset dynamic performance requirement so as to set the active-frequency outer loop control parameter;
the second calculation module is used for solving a closed loop transfer function of a second current control link, and obtaining inequality constraint which is required to be met by the reactive-voltage outer loop control parameter under the preset stability requirement by utilizing the Lawster criterion so as to set the reactive-voltage outer loop control parameter;
the determining module is used for determining the parameter selection range of the virtual inductor and the virtual resistor according to the converter inductance so as to set the virtual impedance control parameter; and
and the third calculation module is used for solving a closed loop transfer function of a third current control link, obtaining inequality constraint which is required to be met by the current inner loop control parameter under the preset stability requirement by utilizing the Lawster criterion, and solving equality constraint which is required to be met by the current inner loop control parameter under the preset dynamic performance requirement so as to set the current inner loop control parameter.
9. The apparatus of claim 8, wherein the closed loop transfer function of the first current control element is:
Figure FDA0003838621580000031
wherein U is the outlet voltage of the converter, E q For outputting voltage, T for converter switching device J Is equivalent to the inertia time constant, D p Is a first damping coefficient, K f For frequency adjustment of the effect coefficient, X s And s is Laplacian, which is the total reactance of the converter.
10. The apparatus of claim 9, wherein the inequality constraint that the active-frequency outer loop control parameter should satisfy comprises:
first stability constraint:
Figure FDA0003838621580000032
and, a first dynamic performance constraint:
Figure FDA0003838621580000033
wherein ζ is the second damping coefficient.
11. The apparatus of claim 8, wherein the closed loop transfer function of the second current control element is:
Figure FDA0003838621580000034
wherein K is pQ And K iQ The proportional and integral gains of the PI link in the reactive-voltage outer loop control link.
12. The apparatus of claim 11, wherein the second stability constraint that the reactive-voltage outer loop control parameter should satisfy is:
Figure FDA0003838621580000035
13. the apparatus of claim 8, wherein the closed loop transfer function of the third current control element is:
Figure FDA0003838621580000036
Figure FDA0003838621580000037
wherein K is pd 、K id 、K pq And K iq Proportional and integral gain, T of PI control link d For the power electronic switch action time, R and L are respectively a converter resistor and an inductor.
14. The apparatus of claim 13, wherein the equality constraint that the current inner loop control parameter should satisfy comprises:
third stability constraint:
Figure FDA0003838621580000041
and, a second dynamic performance constraint:
Figure FDA0003838621580000042
15. an electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the program to implement the grid-tied converter control parameter tuning method of any one of claims 1-7.
16. A computer-readable storage medium having stored thereon a computer program, characterized in that the program is executed by a processor for realizing the grid-built converter control parameter setting method according to any one of claims 1-7.
CN202211105963.9A 2022-09-08 2022-09-08 Method and device for setting control parameters of grid-structured converter Pending CN116388214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211105963.9A CN116388214A (en) 2022-09-08 2022-09-08 Method and device for setting control parameters of grid-structured converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211105963.9A CN116388214A (en) 2022-09-08 2022-09-08 Method and device for setting control parameters of grid-structured converter

Publications (1)

Publication Number Publication Date
CN116388214A true CN116388214A (en) 2023-07-04

Family

ID=86966166

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211105963.9A Pending CN116388214A (en) 2022-09-08 2022-09-08 Method and device for setting control parameters of grid-structured converter

Country Status (1)

Country Link
CN (1) CN116388214A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117254527A (en) * 2023-11-17 2023-12-19 中国电力科学研究院有限公司 Control parameter optimization method and device for grid-structured converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117254527A (en) * 2023-11-17 2023-12-19 中国电力科学研究院有限公司 Control parameter optimization method and device for grid-structured converter
CN117254527B (en) * 2023-11-17 2024-03-15 中国电力科学研究院有限公司 Control parameter optimization method and device for grid-structured converter

Similar Documents

Publication Publication Date Title
US6407531B1 (en) Method and system for controlling a synchronous machine over full operating range
CN111431208B (en) Voltage source and current source dual-mode self-adaptive coordination control method for wind turbine generator
CN109638881B (en) Virtual synchronization method and system for energy storage inverter with power grid strength self-adaptive optimization
CN116388214A (en) Method and device for setting control parameters of grid-structured converter
CN109888776B (en) Prediction method for sub-synchronous resonant frequency of direct-drive wind power plant and terminal equipment
CN112217437A (en) Permanent magnet synchronous motor three-vector model prediction current control circuit and method
CN111987953A (en) Method and system for controlling currents of positive and negative sequence rotors of double-fed fan with single dq control structure
CN111130123A (en) Self-adaptive control method of parallel active power filter
CN114142715A (en) Common-mode resonance circulating current suppression method and system for high-power parallel inverter
CN115276377B (en) Stability verification method for converter self-adaptive reactive current droop control system
WO2023236624A1 (en) Control method and apparatus for parallel apf
TWI587623B (en) Synchronous motor control circuit and control method
CN114567008A (en) Method and system for controlling inverter to stably output
CN110535175B (en) Constant power control method and system applied to micro-source inverter of micro-grid
CN111162706B (en) Dynamic robust current prediction control method, system and medium for single-stator double-rotor disc type counter-rotating permanent magnet synchronous motor
CN113690944A (en) Predictive discrete complex variable resonance control method for inverter
CN112054696A (en) Multilevel converter optimization control method and device based on minimum backflow power
CN108011512A (en) Dual stage matrix converter net side power factor control method based on quasi- PR controls
KR101635183B1 (en) Current response adjusting device and method for output current balancing
CN116191457B (en) Active damping control method of DSTATCOM under weak current network
CN114337440B (en) Signal decoupling method and device applied to inverter under vector control
CN117937608B (en) Impedance robustness compensation method, device, equipment and medium for grid-connected inverter
CN116544959B (en) Nonlinear control method of photovoltaic unified power flow controller
CN114221552B (en) PMSM harmonic suppression control method based on PWM and improved quasi-resonant controller
CN115833223A (en) Method and system for enhancing stability of voltage source type grid-connected converter system

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