CN114498689A - Parallel self-adaptive virtual inductor control method and system for silicon carbide converter - Google Patents

Parallel self-adaptive virtual inductor control method and system for silicon carbide converter Download PDF

Info

Publication number
CN114498689A
CN114498689A CN202111480324.6A CN202111480324A CN114498689A CN 114498689 A CN114498689 A CN 114498689A CN 202111480324 A CN202111480324 A CN 202111480324A CN 114498689 A CN114498689 A CN 114498689A
Authority
CN
China
Prior art keywords
value
silicon carbide
voltage
given
output port
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
CN202111480324.6A
Other languages
Chinese (zh)
Inventor
余豪杰
李官军
王德顺
魏灵峰
陈二松
殷实
丛从
秦昊
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.)
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
State Grid Hebei Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
State Grid Hebei Electric Power 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 State Grid Corp of China SGCC, Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd, China Electric Power Research Institute Co Ltd CEPRI, State Grid Hebei Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN202111480324.6A priority Critical patent/CN114498689A/en
Publication of CN114498689A publication Critical patent/CN114498689A/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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388—Islanding, i.e. disconnection of local power supply from the network
    • 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
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a method and a system for controlling a parallel self-adaptive virtual inductor of a silicon carbide converter, which comprise the following steps: acquiring initial given values of reactive power, angular speed, current and output port voltage of the silicon carbide converters connected in parallel; respectively adjusting the value of the virtual inductor of each parallel silicon carbide converter by adopting a control equation of the virtual inductor according to the value of the reactive power; respectively adjusting the given value of the voltage of the output port of the parallel silicon carbide converters according to the initial given values of the virtual inductance, the angular velocity, the current and the voltage of the output port of each parallel silicon carbide converter; according to the invention, the power sharing error of the parallel silicon carbide converter system is reduced by adjusting the virtual inductance of the parallel silicon carbide converters and the given voltage value of the output port, compared with the traditional algorithm, a better power sharing effect can be obtained, and the technical problems that reactive power is difficult to share and reactive circulation is generated due to different connecting line impedance and equivalent output impedance between the parallel silicon carbide converters are effectively solved.

Description

Parallel self-adaptive virtual inductor control method and system for silicon carbide converter
Technical Field
The invention belongs to the technical field of energy storage, and particularly relates to a parallel self-adaptive virtual inductance control method and system for a silicon carbide converter.
Background
The energy storage system has various application scenes, can be used as a backup power supply to guarantee high reliable power supply to important loads in off-grid application, and can temporarily supply power to the loads, so that the use of a diesel generating set is reduced, and the energy storage system is more environment-friendly.
In practical application, an energy storage system is limited by output power and capacity, and power supply capacity and power supply time are limited, so that the long-time application requirement of a large load is difficult to meet. The adoption of the parallel operation of a plurality of sets of energy storage systems can effectively improve the total output power and the system capacity, improve the loading capacity and expand the application range of the energy storage system, but because the connection impedance and the equivalent output impedance between the converters are different, the reactive power is difficult to be equally divided, and reactive circulation is generated.
In order to solve the above problems, the following control strategies are often adopted in the prior art.
(1) And the single-mode switching of droop control is adopted in both grid-connected operation and off-grid operation. The strategy can avoid the problem of asynchronous dual-mode switching, but the problem of presynchronization when the isolated island is switched into a grid is not effectively solved.
(2) The virtual impedance voltage drop is introduced, and as indirect current control, the output current or power can be controlled by changing the virtual impedance in a grid-connected mode, but transient current and power still occur in the switching process.
Aiming at the problems of power equalization and power quality of parallel operation of energy storage converters under the condition of nonlinear load, a primary control method of three rings of droop-voltage-current based on harmonic virtual impedance and a secondary control method based on harmonic compensation are adopted. The method is complex in control, more in required adjustment parameters and difficult to carry out engineering application.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a parallel self-adaptive virtual inductor control method of a silicon carbide converter, which comprises the following steps:
acquiring initial given values of reactive power, angular speed, current and output port voltage of the parallel silicon carbide converters;
respectively adjusting the value of the virtual inductor of each parallel silicon carbide converter by adopting a control equation of the virtual inductor according to the value of the reactive power;
and respectively adjusting the given value of the voltage of the output port of the parallel silicon carbide converters according to the virtual inductance, the angular velocity and the current of each parallel silicon carbide converter and the given value of the given voltage of the given output port.
Preferably, the control equation of the virtual inductor is as follows:
Lv＝L*-Kv(Q*-Q)
in the formula, L*For a given value of virtual inductance, Q, in the stator equation of a silicon carbide converter*Given value of reactive power, Q is value of reactive power, LvIs the value of the virtual inductance, KvIs the regulation coefficient of the virtual inductance.
Preferably, the adjusting the set point of the output port voltage of the silicon carbide converter according to the initially given value of the output port voltage of the initially given of the virtual inductance, the angular velocity, the current and the output port voltage of the silicon carbide converter comprises:
calculating the value of impedance according to the values of the virtual inductance and the angular velocity of the silicon carbide converter;
calculating a voltage deviation amount according to the values of the impedance and the current;
obtaining a target value of the given value of the voltage of the output port of the silicon carbide converter according to the voltage deviation amount and the initially given value of the voltage of the initially given output port of the voltage of the output port;
and regulating the given voltage value of the output port of the silicon carbide converter according to the target value.
Preferably, the value of the impedance is calculated as follows:
Zv＝Rv+jωLv
in the formula, ZvIs the value of the impedance, RvIs the resistance of the line of the silicon carbide converter, omega is the value of the angular velocity, LvIs the value of the virtual inductance.
Preferably, the voltage deviation amount is calculated by the following equation:
ΔU＝Zv·I
wherein Δ U is a voltage deviation amount, ZvI is the value of the impedance and I is the value of the current.
Preferably, the target value of the given voltage value is calculated by the following formula:
U*＝E-ΔU
in the formula of U*The target value of the given voltage value, E is the initial given value of the output port voltage, and delta U is the voltage deviation amount.
Based on the same inventive concept, the invention also provides a silicon carbide converter parallel connection self-adaptive virtual inductance control system, which comprises: the device comprises a data acquisition module, a first adjusting module and a second adjusting module;
the data acquisition module is used for acquiring the reactive power, the angular speed, the current and the initial given value of the voltage of the output port of the silicon carbide converters which are connected in parallel;
the first adjusting module is used for adjusting the values of the virtual inductors of the parallel silicon carbide converters respectively by adopting a control equation of the virtual inductors according to the value of the reactive power;
and the second adjusting module is used for respectively adjusting the given value of the output port voltage of the parallel silicon carbide converters according to the virtual inductance, the angular velocity and the current of each parallel silicon carbide converter and the given value of the given output port voltage of the output port voltage.
Preferably, the control equation of the virtual inductance adopted by the first adjusting module is as follows:
Lv＝L*-Kv(Q*-Q)
in the formula, L*For a given value of virtual inductance, Q, in the stator equation of a silicon carbide converter*Given value of reactive power, Q is value of reactive power, LvIs the value of the virtual inductance, KvIs the regulation coefficient of the virtual inductance.
Preferably, the second adjusting module is specifically configured to:
calculating the value of impedance according to the values of the virtual inductance and the angular velocity of the silicon carbide converter;
calculating a voltage deviation amount according to the values of the impedance and the current;
obtaining a target value of the given value of the voltage of the output port of the silicon carbide converter according to the voltage deviation amount and the initially given value of the voltage of the initially given output port of the voltage of the output port;
and regulating the given voltage value of the output port of the silicon carbide converter according to the target value.
Preferably, the second adjusting module calculates the value of the module impedance by the following formula:
Zv＝Rv+jωLv
in the formula, ZvIs the value of the impedance, RvIs the resistance of the line of the silicon carbide converter, omega is the value of the angular velocity, LvIs the value of the virtual inductance.
Preferably, the second adjusting module calculates the voltage deviation amount according to the following formula:
ΔU＝Zv·I
wherein Δ U is a voltage deviation amount, ZvI is the value of the impedance and I is the value of the current.
Preferably, the second adjustment module calculates the target value of the given voltage value by the following formula:
U*＝E-ΔU
in the formula of U*The target value of the given voltage value, E is the initial given value of the output port voltage, and delta U is the voltage deviation amount.
The present invention also provides a computer apparatus comprising: one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, implement the method as previously described.
The invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed, implements a method as described above.
Compared with the closest prior art, the invention has the following beneficial effects:
the invention provides a method and a system for controlling a parallel self-adaptive virtual inductor of a silicon carbide converter, which comprise the following steps: acquiring initial given values of reactive power, angular speed, current and output port voltage of the silicon carbide converters connected in parallel; respectively adjusting the value of the virtual inductor of each parallel silicon carbide converter by adopting a control equation of the virtual inductor according to the value of the reactive power; respectively adjusting the given value of the voltage of the output port of the parallel silicon carbide converters according to the initial given values of the virtual inductance, the angular velocity, the current and the voltage of the output port of each parallel silicon carbide converter; according to the invention, the power sharing error of the parallel silicon carbide converter system is reduced by adjusting the virtual inductance of the parallel silicon carbide converters and the given voltage value of the output port, compared with the traditional virtual inductance algorithm, a better power sharing effect can be obtained, and the technical problems that reactive power is difficult to share and reactive circulation is generated due to different connecting line impedance and equivalent output impedance between the parallel silicon carbide converters are effectively solved.
Drawings
Fig. 1 is a schematic flow chart of a parallel adaptive virtual inductor control method for a silicon carbide converter according to the present invention;
FIG. 2 is a schematic diagram illustrating the influence of line impedance on reactive power sharing accuracy according to the present invention;
FIG. 3 is a control block diagram of a given value of a voltage at an output port of a converter according to the present invention;
fig. 4 is a regulating process 1 of the adaptive virtual inductance regulating mechanism provided in the present invention;
fig. 5 is a regulating process 2 of the adaptive virtual inductance regulating mechanism provided in the present invention;
FIG. 6 is a schematic diagram of a simplified model topology in which two VSGs are connected in parallel according to the present invention;
fig. 7(a) is a schematic diagram of an active power distribution situation without adding a virtual inductor;
fig. 7(b) is a schematic diagram of the reactive power distribution without adding a virtual inductor;
fig. 7(c) is a schematic diagram of reactive circulating current without adding virtual inductance;
fig. 8(a) is a schematic diagram of reactive power distribution after control is performed by using an adaptive virtual inductance algorithm;
fig. 8(b) is a schematic diagram of the VSG1 output voltage after control by using the adaptive virtual inductance algorithm;
FIG. 8(c) is a schematic diagram of the VSG2 output voltage after being controlled by the adaptive virtual inductance algorithm;
fig. 8(d) is a schematic diagram of reactive circulation after control by using the adaptive virtual inductance algorithm;
FIG. 8(e) is a schematic diagram of the VSG1 virtual inductance value after control using the adaptive virtual inductance algorithm;
fig. 8(f) is a schematic diagram of the VSG2 virtual inductance value after control by the adaptive virtual inductance algorithm;
fig. 9 is a schematic structural diagram of a parallel adaptive virtual inductance control system of a silicon carbide converter according to the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Example 1:
the schematic flow chart of the parallel self-adaptive virtual inductance control method of the silicon carbide converter provided by the invention is shown in fig. 1, and the method comprises the following steps:
step 1: acquiring initial given values of reactive power, angular speed, current and output port voltage of the silicon carbide converters connected in parallel;
step 2: respectively adjusting the value of the virtual inductor of each parallel silicon carbide converter by adopting a control equation of the virtual inductor according to the value of the reactive power;
and step 3: and respectively adjusting the given value of the voltage of the output port of the parallel silicon carbide converters according to the initial given values of the virtual inductance, the angular velocity, the current and the voltage of the output port of each parallel silicon carbide converter.
When silicon carbide converters (converters or VSGs for short) are operated in parallel, the reactive power and voltage have the relationship shown in fig. 2. The voltage amplitude U at the common connection point (PCC point) of two current transformers with the same rated capacity is approximately unchanged. When there is a difference in the two VSG line impedances, there will also be a difference in their output reactive power according to the exciter equation and the stator equation. Assuming that the line impedance of the converter 1 is greater than that of the converter 2, the output reactive power of the two converters is Q1 and Q2 respectively, and the reactive circulating current between the two converters is delta Q.
The equivalent output impedance of the converter is equivalent to the armature impedance in a stator equation of the synchronous generator, and the impedance-inductance ratio of the converter can be reduced by controlling the stator equation, so that the impedance values of all circuits are close to be consistent, and the reactive power sharing precision is increased. In practical application, the line impedance value is not easy to measure, and the inductance in the virtual impedance is usually set to be a large value, so that the impedance ratio of each path is equal as much as possible, and the impedance-inductance ratio is small as much as possible, thereby improving the reactive power sharing accuracy. However, the reactive power sharing accuracy is limited to be improved, the virtual impedance is divided into a large voltage due to the introduction of the overlarge virtual inductor, voltage drop can be caused, and large impact can be generated when the virtual inductor is switched to be in parallel connection due to the fact that the virtual inductor is a fixed value, and the stability of a system is affected.
In order to solve the problems, a self-adaptive virtual inductance algorithm is adopted, and a virtual inductance value in a stator equation of a converter virtual synchronous control algorithm can be adjusted to a certain extent according to reactive power change, so that equivalent impedance is closer, and the control precision is improved. The control equation of the virtual inductance is as follows:
Lv＝L*-Kv(Q*-Q)
wherein L is*Is the given value of the virtual inductance, Q, in the stator equation*Is a given value of reactive power, Q is an actual value of reactive power, LvIs the actual value of the virtual inductance, KvIs the regulation coefficient of the virtual inductance. Virtual inductance L in stator equationvThe control is performed by a self-adaptive virtual inductance algorithm, and a control block diagram of the given value of the voltage of the output port of the converter based on the self-adaptive virtual inductance is shown in fig. 3, namely:
I. calculating the impedance value according to the virtual inductance and the angular velocity of the silicon carbide converter, as shown in the following formula:
Zv＝Rv+jXv＝Rv+jωLv
in the formula, ZvIs the value of the impedance, RvIs the resistance of the line of the silicon carbide converter, omega is the value of the angular velocity, LvIs the value of the virtual inductance, XvIs the inductive reactance of the circuit of the silicon carbide converter.
II. From the values of the impedance and the current, the amount of voltage deviation is calculated as shown in the following equation:
ΔU＝Zv·I
in the formula, Δ U represents a voltage deviation amount, and I represents a current value.
III, obtaining a target value of the given value of the output port voltage of the silicon carbide converter according to the voltage deviation amount and the initial given value of the output port voltage, wherein the target value is shown as the following formula:
U*＝E-ΔU
in the formula of U*The voltage is a target value of a given voltage value, E is an initial given value of the voltage of an output port, and delta U is a voltage deviation value;
and IV, regulating the given voltage value of the output port of the silicon carbide converter according to the target value.
In FIG. 4, assuming that the inductive reactance is much larger than the resistance, Xln(n-1, 2 …) is the equivalent line inductance of each current transformer, including the actual line impedance Xlinen(line impedance Z)linenInductive component in) and a virtual impedance Xv(Xv＝ωLv)，Ion(n is 1, 2 …) is the line current, Uon(n-1, 2 …) is the VSG output voltage, UpccIs the common point voltage. Two VSGs will be described below as an example. The solid line 1 shows the control relationship of the VSG exciter, and the solid lines 2 and 3 show the respective VSG output voltages UonAnd equivalent line impedance XlnThe relationship between them. When the adjustment is performed according to the adaptive virtual impedance algorithm, two adjustment processes can be divided. The two processes are step 2 and step 3 of the present invention, respectively.
Procedure 1, step 2: in order to reduce the difference value of the two VSGs, the output power is inversely proportional to the virtual inductance adjusting value, namely the virtual inductance required to be adjusted by the unit with small output power is large, and more virtual inductances are required to be adjusted by the unit with small output power. The output power of the solid line 2 is larger, so the virtual inductive reactance value deltax to be adjusted2Is small; the power output by the solid line 3 is small, so the virtual inductive reactance value deltax needs to be adjusted1If the difference is larger, the virtual inductor control equation is used for adjustment to obtain dotted lines 2' and 3', the difference of equivalent impedance is smaller, and the reactive power difference is changed from delta Q to delta Q ', as shown in FIG. 4.
And (2) a process: since the total reactive power value before and after the adjustment is kept unchanged, that is, Q1+ Q2 is Q1 "+ Q2", the dotted lines 2', 3' need to be translated while adjusting the virtual inductance value, the translation is to adjust the given value of the converter output port voltage according to the control block diagram of fig. 3, and finally obtain the solid lines 4 and 5, as shown in fig. 5, the adjustment process is completed. Process 1 and process 2 may be performed simultaneously when actually adjusting.
Q*And taking the reactive power value expected to be output by each path. To meet system performance, LvThe value of (A) should satisfy: l ismin≤Lv+Lline≤LmaxWherein L ismax、LminThe maximum value and the minimum value L of the line inductance are respectively used for keeping the stable operation of the VSG parallel system, reducing the instant impact generated by parallel connection and meeting the control precision requirementlineThe inductance value of the VSG output line.
Example 2:
a specific example is given below.
In order to verify the effectiveness of the self-adaptive virtual inductance algorithm, two sets of VSGs are constructed on the basis of MATLAB/Simulink software to run in parallel, the simulation topology is shown in FIG. 6, the two VSGs in the simulation topology respectively have local loads of 20kW and 10kVar, and the common load is 40kW and 20 kVar. L1 and L2 are the line impedances of the two VSGs, 1mH and 1.4mH, respectively. Both VSGs set the same control parameters as shown in table 1.
TABLE 1 VSG control parameters
Figure BDA0003394999660000061
Figure BDA0003394999660000071
The simulation results of the common load input under the condition that the virtual inductance is not increased at 0.3s after the two VSGs operate stably with loads are shown in fig. 7(a) -7 (c), and it can be seen from the graphs that due to the fact that an integral link exists in the VSG active control, the active power sharing effect is good, but due to line impedance difference, the reactive power sharing error is large when the virtual inductance is not added, and it can be seen that delta Q is about 1540Var, and therefore stable operation of the system can be affected.
Setting virtual inductance given value L in self-adaptive virtual inductance control*0.001H, adjustCoefficient Kv＝3×10-7Similarly, the common load is put in at 0.3s, the simulation results are shown in fig. 8(a) to 8(f), the reactive power output by both VSGs is shown in fig. 8(a), the output voltage is shown in fig. 8(b) and 8(c), and the reactive circulating current is shown in fig. 8 (d). As can be seen from simulation results, a better reactive power sharing effect can be achieved after the self-adaptive virtual inductor is added, the reactive deviation of the two converters is reduced to 530Var, and reactive circulating current is reduced. Fig. 8(e) and 8(f) show the adaptive virtual inductance values of the two VSGs, and it can be seen that the difference between the two virtual inductance values is 0.07mH, which compensates for the difference between the two VSG line impedances to some extent.
Example 3:
based on the same inventive concept, the invention also provides a silicon carbide converter parallel connection self-adaptive virtual inductance control system structure, as shown in fig. 9, comprising: the device comprises a data acquisition module, a first adjusting module and a second adjusting module;
the data acquisition module is used for acquiring initial given values of reactive power, angular speed, current and output port voltage of the silicon carbide converters connected in parallel;
the first adjusting module is used for adjusting the value of the virtual inductor of each parallel silicon carbide converter by adopting a control equation of the virtual inductor according to the value of the reactive power;
and the second adjusting module is used for respectively adjusting the given value of the output port voltage of the parallel silicon carbide converters according to the virtual inductance, the angular velocity and the current of each parallel silicon carbide converter and the given value of the given output port voltage of the output port voltage.
The control equation of the virtual inductor adopted by the first adjusting module is shown as the following formula:
Lv＝L*-Kv(Q*-Q)
in the formula, L*For a given value of virtual inductance, Q, in the stator equation of a silicon carbide converter*Given value of reactive power, Q is value of reactive power, LvIs the value of the virtual inductance, KvIs the regulation coefficient of the virtual inductance.
Wherein, the second adjusting module is specifically configured to:
calculating the value of impedance according to the values of the virtual inductance and the angular velocity of the silicon carbide converter;
calculating a voltage deviation amount according to the values of the impedance and the current;
obtaining a target value of the given value of the voltage of the output port of the silicon carbide converter according to the voltage deviation amount and the initially given value of the voltage of the initially given output port of the voltage of the output port;
and regulating the given voltage value of the output port of the silicon carbide converter according to the target value.
The calculation formula of the impedance value of the second adjusting module calculation module is as follows:
Zv＝Rv+jωLv
in the formula, ZvIs the value of the impedance, RvIs the resistance of the line of the silicon carbide converter, omega is the value of the angular velocity, LvIs the value of the virtual inductance.
The calculation formula of the second adjusting module for calculating the voltage deviation amount is as follows:
ΔU＝Zv·I
wherein Δ U is a voltage deviation amount, ZvI is the value of the impedance and I is the value of the current.
The calculation formula of the second regulation module for calculating the target value of the given voltage value is as follows:
U*＝E-ΔU
in the formula of U*The target value of the given voltage value, E is the initial given value of the output port voltage, and delta U is the voltage deviation amount.
Example 4:
the present invention also provides a computer device comprising: one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, implement the method as previously described.
Example 5:
the invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed, implements a method as described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present invention is described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that after reading the present invention, they can make various changes, modifications or equivalents to the specific embodiments of the application, but these changes, modifications or equivalents are all within the protection scope of the claims of the application.

Claims (14)

1. A parallel self-adaptive virtual inductance control method for a silicon carbide converter is characterized by comprising the following steps:
acquiring initial given values of reactive power, angular speed, current and output port voltage of the silicon carbide converters connected in parallel;
respectively adjusting the value of the virtual inductor of each parallel silicon carbide converter by adopting a control equation of the virtual inductor according to the value of the reactive power;
and respectively adjusting the given value of the voltage of the output port of the parallel silicon carbide converters according to the initial given values of the virtual inductance, the angular velocity, the current and the voltage of the output port of each parallel silicon carbide converter.
2. The method of claim 1, wherein the governing equation for the virtual inductance is as follows:
Lv＝L*-Kv(Q*-Q)
in the formula, L*For a given value of virtual inductance, Q, in the stator equation of a silicon carbide converter*Given value of reactive power, Q is value of reactive power, LvIs the value of the virtual inductance, KvIs the regulation coefficient of the virtual inductance.
3. The method of claim 1, wherein adjusting the set point for the output port voltage of the silicon carbide converter based on the initially given values for the virtual inductance, angular velocity, current, and output port voltage of the silicon carbide converter comprises:
calculating the value of impedance according to the values of the virtual inductance and the angular velocity of the silicon carbide converter;
calculating a voltage deviation amount according to the values of the impedance and the current;
obtaining a target value of the given voltage value of the output port of the silicon carbide converter according to the voltage deviation amount and the initial given value of the voltage of the output port;
and regulating the given voltage value of the output port of the silicon carbide converter according to the target value.
4. The method of claim 3, wherein the value of the impedance is calculated as follows:
Zv＝Rv+jωLv
in the formula, ZvIs the value of the impedance, RvIs the resistance of the line of the silicon carbide converter, omega is the value of the angular velocity, LvIs the value of the virtual inductance.
5. The method of claim 3, wherein the voltage deviation is calculated as follows:
ΔU＝Zv·I
wherein Δ U is a voltage deviation amount, ZvI is the value of the impedance and I is the value of the current.
6. A method according to claim 3, wherein the target value of the given voltage value is calculated by:
U*＝E-ΔU
in the formula of U*The target value of the given voltage value, E is the initial given value of the output port voltage, and delta U is the voltage deviation amount.
7. A silicon carbide converter parallel connection self-adaptive virtual inductance control system is characterized by comprising: the device comprises a data acquisition module, a first adjusting module and a second adjusting module;
the data acquisition module is used for acquiring initial given values of reactive power, angular speed, current and output port voltage of the silicon carbide converters connected in parallel;
the first adjusting module is used for adjusting the values of the virtual inductors of the parallel silicon carbide converters respectively by adopting a control equation of the virtual inductors according to the value of the reactive power;
and the second adjusting module is used for respectively adjusting the given value of the output port voltage of the parallel silicon carbide converters according to the virtual inductance, the angular velocity and the current of each parallel silicon carbide converter and the given value of the given output port voltage of the output port voltage.
8. The system of claim 7, wherein the control equation for the virtual inductance employed by the first regulation module is as follows:
Lv＝L*-Kv(Q*-Q)
in the formula, L*For a given value of virtual inductance, Q, in the stator equation of a silicon carbide converter*Given value of reactive power, Q is value of reactive power, LvIs the value of the virtual inductance, KvIs the regulation coefficient of the virtual inductance.
9. The system of claim 8, wherein the second adjustment module is specifically configured to:
calculating the value of impedance according to the values of the virtual inductance and the angular velocity of the silicon carbide converter;
calculating a voltage deviation amount according to the values of the impedance and the current;
obtaining a target value of the given value of the voltage of the output port of the silicon carbide converter according to the voltage deviation amount and the initially given value of the voltage of the initially given output port of the voltage of the output port;
and regulating the given voltage value of the output port of the silicon carbide converter according to the target value.
10. The system of claim 9, wherein the second adjustment module calculates the value of the module impedance as follows:
Zv＝Rv+jωLv
in the formula, ZvIs the value of the impedance, RvIs the resistance of the line of the silicon carbide converter, omega is the value of the angular velocity, LvIs the value of the virtual inductance.
11. The system of claim 9, wherein the second adjustment module calculates the voltage offset by:
ΔU＝Zv·I
wherein Δ U is a voltage deviation amount, ZvI is the value of the impedance and I is the value of the current.
12. The system of claim 9, wherein the second adjustment module calculates the target value for the given voltage value by:
U*＝E-ΔU
in the formula of U*The target value of the given voltage value, E is the initial given value of the output port voltage, and delta U is the voltage deviation amount.
13. A computer device, comprising: one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, implement the method of any of claims 1-6.
14. A computer-readable storage medium, having stored thereon a computer program which, when executed, implements the method of any one of claims 1 to 6.
CN202111480324.6A 2021-12-06 2021-12-06 Parallel self-adaptive virtual inductor control method and system for silicon carbide converter Pending CN114498689A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111480324.6A CN114498689A (en) 2021-12-06 2021-12-06 Parallel self-adaptive virtual inductor control method and system for silicon carbide converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111480324.6A CN114498689A (en) 2021-12-06 2021-12-06 Parallel self-adaptive virtual inductor control method and system for silicon carbide converter

Publications (1)

Publication Number Publication Date
CN114498689A true CN114498689A (en) 2022-05-13

Family

ID=81492292

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111480324.6A Pending CN114498689A (en) 2021-12-06 2021-12-06 Parallel self-adaptive virtual inductor control method and system for silicon carbide converter

Country Status (1)

Country Link
CN (1) CN114498689A (en)

Similar Documents

Publication Publication Date Title
CN109149620B (en) Self-energy-storage multi-terminal flexible-straight system control method and system
CN110212799B (en) Passive backstepping control method for restraining circulating current of modular multilevel converter
CN110649632B (en) Control method and device of high-excitation-multiple magnetically-controlled high-voltage shunt reactor
CN113824160A (en) Adaptive virtual inductor-based micro-grid parallel inverter power regulation method
Baimel Implementation of DQ0 control methods in high power electronics devices for renewable energy sources, energy storage and FACTS
CN103259268A (en) Microgrid reactive-voltage control device and control method thereof
CN111555359A (en) Secondary control method for accurate power distribution of island micro-grid
CN110676850B (en) Split capacitor direct-current voltage balancing method and system of three-phase four-wire three-leg STATCOM
CN115589036A (en) Method for adjusting parallel active power equalization of multiple inverters based on self-adaptive virtual impedance
CN109980973B (en) Parallel active clamping three-level SVG system and control method thereof
Molina et al. Analysis of integrated STATCOM-SMES based on three-phase three-level multi-pulse voltage source inverter for high power utility applications
Mao et al. A unified controller for a microgrid based on adaptive virtual impedance and conductance
CN111555358A (en) Multi-distributed power supply parallel operation method based on self-adaptive droop control
CN114498689A (en) Parallel self-adaptive virtual inductor control method and system for silicon carbide converter
CN116760268A (en) Harmonic control method and system suitable for grid-connected converter
CN115441511A (en) Inverter multi-parameter collaborative self-adaptive VSG parallel control method and system
CN114597975A (en) Power distribution method and control equipment for parallel system
CN112928764A (en) Parallel energy storage system control method, parallel energy storage system and device
Zhang et al. Adaptive virtual impedance control based on second-order generalized integral for circulating current suppression
Fu et al. Analysis and suppression method of synchronous frequency resonance for self-synchronizing voltage source inverter
CN113890073B (en) Improved model prediction method for unequal-capacity multi-inverter parallel flywheel energy storage system
CN112886606B (en) Hybrid reactive compensation method, device, equipment and medium considering valve side regulation and control
CN116014692B (en) Network-structured VSC fault current suppression method based on voltage vector dynamic tracking control
CN112165125B (en) Inertia anti-droop control method and system
Hu et al. A novel power synchronization strategy and an overall control architecture for star-connected cascaded H-bridge STATCOMs

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication