CN117254443A - Control method, device, equipment and medium for flexible interconnection system of low-voltage transformer area - Google Patents

Control method, device, equipment and medium for flexible interconnection system of low-voltage transformer area Download PDF

Info

Publication number
CN117254443A
CN117254443A CN202311032680.0A CN202311032680A CN117254443A CN 117254443 A CN117254443 A CN 117254443A CN 202311032680 A CN202311032680 A CN 202311032680A CN 117254443 A CN117254443 A CN 117254443A
Authority
CN
China
Prior art keywords
voltage
current
control
controller
command
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
CN202311032680.0A
Other languages
Chinese (zh)
Inventor
季宇
宁昕
邵瑶
熊雄
徐旖旎
张海
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.)
China Online Shanghai Energy Internet Research Institute Co ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Original Assignee
China Online Shanghai Energy Internet Research Institute Co ltd
State Grid Corp of China SGCC
State Grid Jiangsu 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 China Online Shanghai Energy Internet Research Institute Co ltd, State Grid Corp of China SGCC, State Grid Jiangsu Electric Power Co Ltd filed Critical China Online Shanghai Energy Internet Research Institute Co ltd
Priority to CN202311032680.0A priority Critical patent/CN117254443A/en
Publication of CN117254443A publication Critical patent/CN117254443A/en
Pending legal-status Critical Current

Links

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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
    • 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
    • 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
    • H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention relates to a control method, a device, equipment and a medium of a flexible interconnection system of a low-voltage area, wherein the method comprises the following steps: judging the operation mode of the station area; when the operation mode of the platform area is a grid-connected mode, calculating balance control parameters according to the power grid and the alternating current frequency of the platform area; determining a voltage instruction according to the DC bus voltage set value and the balance control parameter; calculating according to the voltage command and the actual value of the DC bus voltage to obtain a current command; and calculating by using the current instruction to obtain a control signal of the converter, and controlling the console area to run to a control target by adopting the control signal. The invention can realize the load balance of each station area, smooth off-network switching and improvement of fault crossing capability under the condition of no inter-station communication.

Description

Control method, device, equipment and medium for flexible interconnection system of low-voltage transformer area
Technical Field
The invention relates to the technical field of power electronic control, in particular to a control method and device for a flexible interconnection system of a low-voltage transformer area.
Background
Distribution transformer areas are one of the important components in power systems, and their stable operation directly affects local industrial development and consumer quality of life. At present, most of low-voltage transformer areas are in the form of single transformers, the reliability is low, power supply among the transformer areas is independent, unified management and control are lacking, and the capability of coping with natural disasters such as typhoons is not achieved. In particular, the conventional single transformer distribution transformer substation has the following disadvantages. First, with the advance of new construction and rural electrification, the requirements of the transformer area on the power supply reliability are increasingly higher, the required capacity is also increased, and the increasing power consumption and high reliability requirements are difficult to meet by the original single-transformer power supply. Secondly, new energy and development of micro-grid technology also put forward new demands on power distribution areas, for example, power electronic converters are required to be connected to photovoltaic, wind power and other distributed power generation, and direct current loads such as electric automobile charging stations, data centers and 5G base stations are required to be powered. Third, seasonal load fluctuations often occur in the transformer areas, and the situation of unbalanced load rates among the transformer areas is more remarkable due to different economic structures of the transformer areas, so that the residual capacity of each transformer area cannot be effectively utilized by the conventional single transformer distribution area. In this context, low voltage dc flexible power distribution technology is of great interest. The low-voltage direct-current flexible power distribution technology constructs a low-voltage direct-current bus nearby a power distribution station through a power electronic converter, so that flexible interaction between the power distribution stations can be realized, distributed energy can be consumed through the direct-current bus, and the power distribution station is a solution for changing the running current situation of the station and improving the power supply level of the station in a multi-dimensional mode.
The control technology of the flexible interconnection system is an important point for exerting the advantages of the flexible interconnection system. Because the middle direct current link is a necessary path for power interaction among all stations, the control of the direct current side voltage is the core content of the flexible interconnection system, and the functions of load balancing, fault ride-through capability improvement and the like depend on the stability of the direct current bus voltage. Master-slave control, autonomous distributed control and droop control are control schemes which are relatively mature at present. The master-slave control means that a certain low-voltage station area is selected as a master station area, the master station area adopts a constant direct current voltage control mode and is used for supporting a direct current bus, and other station areas are selected as slave station areas and adopt a constant power control strategy. The autonomous distributed control is improved on the basis of master-slave control, after a certain platform area is selected as a main platform area, a plurality of platform areas are additionally selected as auxiliary platform areas, and the auxiliary platform areas take over control of direct current bus voltage according to certain logic. For example, the voltage of the direct current bus is in a normal range, the auxiliary station area adopts constant power control, the voltage drops to a certain threshold value, and the auxiliary station area and the main station area jointly support the direct current bus. And the droop control is to preset a droop characteristic curve of the DC/AC converters in the transformer area, so that the power balance of each converter is realized.
The existing three control schemes have advantages and disadvantages respectively, wherein the droop control reliability is higher than that of the other two control schemes, and the control schemes are independent of communication. However, no existing droop control strategy and its improvement scheme can realize load balancing control for flexible interconnection system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control method and a device for a flexible interconnection system of a low-voltage station, which can realize load balancing of each station, off-network smooth switching and improvement of fault crossing capability under the condition of no inter-station communication.
The technical scheme adopted for solving the technical problems is as follows: the control method of the flexible interconnection system of the low-voltage station area comprises the following steps:
judging the operation mode of the station area;
when the operation mode of the platform area is a grid-connected mode, calculating balance control parameters according to the power grid and the alternating current frequency of the platform area;
determining a voltage instruction according to the DC bus voltage set value and the balance control parameter;
calculating according to the voltage command and the actual value of the DC bus voltage to obtain a current command;
and calculating by using the current instruction to obtain a control signal of the converter, and controlling the console area to run to a control target by adopting the control signal.
The equalization control parameters are calculated according to the power grid power and the alternating current frequency of the station area, and the adopted calculation mode is as follows: δv 2 ＝r v P grid +r f (f * -f), wherein δv 2 Represents the equalization control parameters, P grid For the power of the power grid of the transformer area, f * For the rated alternating frequency of the transformer area, f is the actual alternating frequency of the transformer area, r v And r f Are all control weight coefficients.
The voltage instruction is determined according to the DC bus voltage set value and the balance control parameter, specifically: subtracting the balance control parameter from the square of the DC bus voltage set value to obtain the voltage command.
The current command is obtained by calculation according to the voltage command and the actual value of the DC bus voltage, and specifically comprises the following steps: and calculating the deviation of the square of the voltage command and the actual value of the DC bus voltage, and sending the deviation into a first PI controller to obtain a current command.
The first PI controller is connected with the second PI controller throughCalculating a current command, wherein k pv And k iv The proportional control parameter and the integral control parameter of the first PI controller are respectively, s is Laplacian, and ++>And->Respectively a d-axis current command and a q-axis current command, V dc,k And->The actual value of the DC bus voltage and the voltage command are respectively.
The control signal of the converter is obtained by calculation by using the current instruction, and specifically comprises the following steps: and calculating the current deviation between the current instruction and the current actual value, sending the current deviation into a second PI controller to obtain an alternating current voltage correction value, and generating a control signal of the converter according to the alternating current voltage correction value.
The second PI controller is connected with the second PI controller throughCalculating to obtain an alternating voltage correction value, wherein k is pi And k ii Respectively a proportional control parameter and an integral control parameter of the second PI controller, s is a Laplacian operator,/and a third PI controller, and a fourth PI controller is a control parameter of the second PI controller>And->D-axis current command and q-axis current command, I d,k And I q,k The d-axis current actual value and the q-axis current actual value, respectively.
The technical scheme adopted for solving the technical problems is as follows: provided is a control device of a flexible interconnection system of a low-voltage area, comprising:
the judging module is used for judging the running mode of the station area;
the balance control parameter calculation module is used for calculating balance control parameters according to the power grid and the alternating current frequency of the platform region when the operation mode of the platform region is a grid-connected mode;
the voltage command determining module is used for determining a voltage command according to the DC bus voltage set value and the balance control parameter;
the current instruction determining module is used for calculating and obtaining a current instruction according to the voltage instruction and the actual value of the voltage of the direct-current bus;
and the control module is used for calculating by using the current instruction, obtaining a control signal of the converter, and controlling the console area to run to a control target by adopting the control signal.
The equalization control parameter calculation module calculates the equalization control parameters by δv 2 ＝r v P grid +r f (f * -f) calculating an equalization control parameter, wherein δv 2 Represents the equalization control parameters, P grid For the power of the power grid of the transformer area, f * For the rated alternating frequency of the transformer area, f is the actual alternating frequency of the transformer area, r v And r f Are all control weight coefficients.
The voltage command determining module subtracts the equalization control parameter from the square of the DC bus voltage set value to obtain the voltage command.
And the current instruction determining module calculates the deviation of the square of the voltage instruction and the actual value of the direct current bus voltage, and sends the deviation into the first PI controller to obtain the current instruction.
The first PI controller is connected with the second PI controller throughCalculating a current command, wherein k pv And k iv The proportional control parameter and the integral control parameter of the first PI controller are respectively, s is Laplacian, and ++>And->Respectively a d-axis current command and a q-axis current command, V dc,k And->The actual value of the DC bus voltage and the voltage command are respectively.
When the control module calculates to obtain a control signal of the converter by using the current command, calculating the current deviation between the current command and the current actual value, and sending the current deviation into the second PI controller to obtain an alternating current voltage correction value, and generating the control signal of the converter according to the alternating current voltage correction value.
The second PI controller is connected with the second PI controller throughCalculating to obtain an alternating voltage correction value, wherein k is pi And k ii Respectively a proportional control parameter and an integral control parameter of the second PI controller, s is a Laplacian operator,/and a third PI controller, and a fourth PI controller is a control parameter of the second PI controller>And->D-axis current command and q-axis current command, I d,k And I q,k The d-axis current actual value and the q-axis current actual value, respectively.
The technical scheme adopted for solving the technical problems is as follows: an electronic device is provided, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the low voltage area flexible interconnect system control method described above when the computer program is executed by the processor.
The technical scheme adopted for solving the technical problems is as follows: there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the low voltage bay flexible interconnect system control method described above.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: according to the power grid power and alternating current frequency calculation balance control parameters of each station area, flexible interconnection and load balance between the station areas can be achieved, the power supply capacity of each station area is effectively utilized, the increase of power supply requirements and fluctuation of loads are dealt with, and the control method can improve the fault ride-through capacity of the station areas and improve the electric energy quality in the station areas. In addition, the control method can realize the switching of grid connection and off-grid modes when the station area is powered off, maintain the voltage and frequency of the station area, and improve the power supply reliability of the system.
Drawings
FIG. 1 is a flow chart of a method of controlling a flexible interconnection system in a low voltage area according to a first embodiment of the present invention;
FIG. 2 is a system topology of an embodiment of the present invention;
fig. 3 is a control structure diagram of an embodiment of the present invention.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
The first embodiment of the invention relates to a control method of a flexible interconnection system of a low-voltage station area, which does not need to establish inter-station communication, so that a new station area, renewable energy power generation, direct current load and the like can be conveniently connected into the flexible interconnection system, the expansibility is good, the communication is not relied on, the renewable energy consumption level can be improved, and the low-carbon green power generation transformation development is promoted. As shown in fig. 1, the method specifically comprises the following steps:
step 1, judging an operation mode of a platform area, wherein the operation mode of the platform area in the embodiment comprises a grid-connected operation mode and an off-grid operation mode.
And 2, when the operation mode of the platform area is a grid-connected mode, calculating an equalization control parameter according to the power grid and the alternating current frequency of the platform area. The calculation mode adopted in the calculation is as follows: δv 2 ＝r v P grid +r f (f * -f), wherein δv 2 Represents the equalization control parameters, P grid For the power of the power grid of the transformer area, f * For the rated alternating frequency of the transformer area, f is the actual alternating frequency of the transformer area, r v And r f Are all control weight coefficients. r is (r) v P grid The items are used for controlling the load balance of each platform area; r is (r) f (f * -f) the term is used for reducing the output of the transformer area when the frequency of the transformer area falls, reducing the burden of the transformer area and improving the fault crossing capability.
Step 3, determining a voltage command according to the DC bus voltage set value and the balance control parameter, specifically, subtracting the balance control parameter from the square of the DC bus voltage set value to obtain the voltage command, namely For the DC bus voltage set point, < >>Is a voltage command, wherein the dc bus voltage setpoint may be a dc bus voltage rating.
And step 4, calculating to obtain a current instruction according to the voltage instruction and the actual value of the DC bus voltage. In the step, the deviation of the square of the voltage command and the actual value of the DC bus voltage is calculated, and then the deviation is sent to a first PI controller to obtain a current command. When the first PI controller calculates the current instruction, the calculation mode adopted is as follows:wherein k is pv And k iv The proportional control parameter and the integral control parameter of the first PI controller are respectively, s is Laplacian, and ++>And->Respectively a d-axis current command and a q-axis current command, V dc,k And->The actual value of the DC bus voltage and the voltage command are respectively.
And 5, calculating by using the current instruction to obtain a control signal of the converter, and controlling the console area to run to a control target by adopting the control signal. The control signal of the converter in this step is obtained by: and calculating the current deviation between the current instruction and the current actual value, sending the current deviation into a second PI controller to obtain an alternating current voltage correction value, and generating a control signal of the converter according to the alternating current voltage correction value. When the second PI controller calculates the AC voltage correction value, the calculation mode is as follows:wherein k is pi And k ii Respectively a proportional control parameter and an integral control parameter of the second PI controller, s is a Laplacian operator,/and a third PI controller, and a fourth PI controller is a control parameter of the second PI controller>And->D-axis current command and q-axis current command, I d,k And I q,k The d-axis current actual value and the q-axis current actual value, respectively.
And 6, when the operation mode of the station area is the off-grid mode, controlling the converter by using a Vf control method according to the station area voltage and frequency, and supporting the alternating current voltage and frequency.
The control method of the embodiment can be applied to a system topology as shown in fig. 2, wherein the system topology is a three-station system topology, each station is internally provided with an alternating current load and an alternating current power supply, the stations are connected to a direct current bus through a DC/AC converter, the converters of each station are all provided with control equipment for control, the control method of the low-voltage flexible interconnection system of the embodiment is deployed in the control equipment of the converters, the control strategy is shown in fig. 3, and the working process is as follows:
during normal operation, the control strategy operates in a grid-connected mode, and each area acquires own alternating current power grid power and alternating current frequency and passes δv 2 ＝r v P grid +r f (f * -f) calculating the equalization control parameter δv 2 . Squaring using DC bus voltage set pointSubtracting the equalization control parameter δv 2 Obtaining a voltage command, and squaring the actual value of the DC bus voltage according to the voltage command>Calculating a current command, wherein the current command comprises a current d-axis component command +.>And current q-axis component instruction->According to the current d-axis component instruction->And the current d-axis component actual value I d,k Calculating to obtain d-axis correction value of alternating voltage according to current q-axis component instruction +.>And current q-axis component actual value I q,k Calculating to obtain an alternating voltage q-axis correction value, and obtaining an alternating voltage d-axis component instruction according to the alternating voltage d-axis correction value and the alternating voltage q-axis correction value>And an alternating voltage q-axis component commandAnd based on the d-axis component command of the alternating voltage +.>And an alternating voltage q-axis component instruction +.>And obtaining a converter control signal, and controlling the console area to operate to a control target according to the converter control signal. In the process, each station area operates independently, and only the state information and the direct current bus voltage of the station area are required to be collected, so that communication with other station areas is not required.
When a certain station area has a disconnection fault, an alternating current power supply in the station area is powered off, a control strategy is switched to an off-grid mode, the station area where the power failure occurs collects alternating current voltage and frequency of the station area, a Vf control method is used for controlling the converter, the alternating current voltage and frequency are supported, and alternating current load in the station area is guaranteed to supply power.
It is not difficult to find that the invention calculates the balance control parameters according to the power grid power and the alternating current frequency of each station area, can realize flexible interconnection and load balance between the station areas, effectively utilizes the power supply capacity of each station area, and can cope with the increase of power supply demands and the fluctuation of loads. In addition, the control method can realize the switching of grid connection and off-grid modes when the station area is powered off, maintain the voltage and frequency of the station area, and improve the power supply reliability of the system.
The second embodiment of the invention relates to a control device of a flexible interconnection system of a low-voltage station area, which comprises:
the judging module is used for judging the running mode of the station area;
the balance control parameter calculation module is used for calculating balance control parameters according to the power grid and the alternating current frequency of the platform region when the operation mode of the platform region is a grid-connected mode;
the voltage command determining module is used for determining a voltage command according to the DC bus voltage set value and the balance control parameter;
the current instruction determining module is used for calculating and obtaining a current instruction according to the voltage instruction and the actual value of the voltage of the direct-current bus;
and the control module is used for calculating by using the current instruction, obtaining a control signal of the converter, and controlling the console area to run to a control target by adopting the control signal.
The equalization control parameter calculation module calculates the equalization control parameters by δv 2 ＝r v P grid +r f (f * -f) calculating an equalization control parameter, wherein δv 2 Represents the equalization control parameters, P grid For the power of the power grid of the transformer area, f * For the rated alternating frequency of the transformer area, f is the actual alternating frequency of the transformer area, r v And r f Are all control weight coefficients.
The voltage command determining module subtracts the equalization control parameter from the square of the DC bus voltage set value to obtain the voltage command.
And the current instruction determining module calculates the deviation of the square of the voltage instruction and the actual value of the direct current bus voltage, and sends the deviation into the first PI controller to obtain the current instruction.
The first PI controller is connected with the second PI controller throughCalculating a current command, wherein k pv And k iv The proportional control parameter and the integral control parameter of the first PI controller are respectively, s is Laplacian, and ++>And->Respectively a d-axis current command and a q-axis current command, V dc,k And->The actual value of the DC bus voltage and the voltage command are respectively.
When the control module calculates to obtain a control signal of the converter by using the current command, calculating the current deviation between the current command and the current actual value, and sending the current deviation into the second PI controller to obtain an alternating current voltage correction value, and generating the control signal of the converter according to the alternating current voltage correction value.
The second PI controller is connected with the second PI controller throughCalculating to obtain an alternating voltage correction value, wherein k is pi And k ii Respectively a proportional control parameter and an integral control parameter of the second PI controller, s is a Laplacian operator,/and a third PI controller, and a fourth PI controller is a control parameter of the second PI controller>And->D-axis current command and q-axis current command, I d,k And I q,k The d-axis current actual value and the q-axis current actual value, respectively.
A third embodiment of the invention relates to an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the low voltage bay flexible interconnect system control method of the first embodiment when executing the computer program.
A fourth embodiment of the present invention is directed to a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the low voltage bay flexible interconnect system control method of the first embodiment.
It will be appreciated by those skilled in the art that 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 scheme in the embodiment of the invention can be realized by adopting various computer languages, such as object-oriented programming language Java, an transliteration script language JavaScript and the like.
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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (16)

1. The control method of the flexible interconnection system of the low-voltage station area is characterized by comprising the following steps of:
judging the operation mode of the station area;
when the operation mode of the platform area is a grid-connected mode, calculating balance control parameters according to the power grid and the alternating current frequency of the platform area;
determining a voltage instruction according to the DC bus voltage set value and the balance control parameter;
calculating according to the voltage command and the actual value of the DC bus voltage to obtain a current command;
and calculating by using the current instruction to obtain a control signal of the converter, and controlling the console area to run to a control target by adopting the control signal.
2. The method for controlling the flexible interconnection system of the low-voltage transformer area according to claim 1, wherein the balance control parameter is calculated according to the power grid and the alternating current frequency of the transformer area by adopting the following calculation method: δv 2 ＝r v P grid +r f (f * -f), wherein δv 2 Represents the equalization control parameters, P grid For the power of the power grid of the transformer area, f * For the rated alternating frequency of the transformer area, f is the actual alternating frequency of the transformer area, r v And r f Are all control weight coefficients.
3. The method for controlling the flexible interconnection system of the low-voltage transformer area according to claim 1, wherein the determining the voltage command according to the dc bus voltage set value and the equalization control parameter specifically comprises: subtracting the balance control parameter from the square of the DC bus voltage set value to obtain the voltage command.
4. The control method of the flexible interconnection system of the low-voltage transformer area according to claim 1, wherein the current command is calculated according to the voltage command and the actual value of the voltage of the direct-current bus, specifically: and calculating the deviation of the square of the voltage command and the actual value of the DC bus voltage, and sending the deviation into a first PI controller to obtain a current command.
5. The method of claim 4, wherein the first PI controller is configured to control the low voltage distribution flexible interconnect system byCalculating a current command, wherein k pv And k iv The proportional control parameter and the integral control parameter of the first PI controller are respectively, s is Laplacian, and ++>And->Respectively a d-axis current command and a q-axis current command, V dc,k And->The actual value of the DC bus voltage and the voltage command are respectively.
6. The control method of the flexible interconnection system of the low-voltage transformer area according to claim 1, wherein the calculating using the current command obtains a control signal of the current transformer, specifically: and calculating the current deviation between the current instruction and the current actual value, sending the current deviation into a second PI controller to obtain an alternating current voltage correction value, and generating a control signal of the converter according to the alternating current voltage correction value.
7. According to claim 6The control method of the flexible interconnection system of the low-voltage transformer area is characterized in that the second PI controller is connected with the first PI controller through the second PI controllerCalculating to obtain an alternating voltage correction value, wherein k is pi And k ii Respectively a proportional control parameter and an integral control parameter of the second PI controller, s is a Laplacian operator,/and a third PI controller, and a fourth PI controller is a control parameter of the second PI controller>And->D-axis current command and q-axis current command, I d,k And I q,k The d-axis current actual value and the q-axis current actual value, respectively.
8. A low voltage bay flexible interconnect system control device, comprising:
the judging module is used for judging the running mode of the station area;
the balance control parameter calculation module is used for calculating balance control parameters according to the power grid and the alternating current frequency of the platform region when the operation mode of the platform region is a grid-connected mode;
the voltage command determining module is used for determining a voltage command according to the DC bus voltage set value and the balance control parameter;
the current instruction determining module is used for calculating and obtaining a current instruction according to the voltage instruction and the actual value of the voltage of the direct-current bus; and the control module is used for calculating by using the current instruction, obtaining a control signal of the converter, and controlling the console area to run to a control target by adopting the control signal.
9. The low-voltage transformer area flexible interconnection system control device according to claim 8, wherein the equalization control parameter calculation module calculates the equalization control parameter by δv 2 ＝r v P grid +r f (f * -f) calculating an equalization control parameter, wherein δv 2 Representation equalization controlParameters of production, P grid For the power of the power grid of the transformer area, f * For the rated alternating frequency of the transformer area, f is the actual alternating frequency of the transformer area, r v And r f Are all control weight coefficients.
10. The low voltage bay flexible interconnect system control of claim 8, wherein said voltage command determination module subtracts said equalization control parameter from a square of said dc bus voltage set point to obtain said voltage command.
11. The control device of the flexible interconnection system in the low-voltage area according to claim 8, wherein the current command determining module calculates a deviation of the square of the voltage command and the actual value of the dc bus voltage, and sends the deviation to the first PI controller to obtain the current command.
12. The low voltage bay flexible interconnect system control of claim 11, wherein the first PI controller is configured to control the first PI controller byCalculating a current command, wherein k pv And k iv The proportional control parameter and the integral control parameter of the first PI controller are respectively, s is Laplacian, and ++>And->Respectively a d-axis current command and a q-axis current command, V dc,k And->The actual value of the DC bus voltage and the voltage command are respectively.
13. The control device of the flexible interconnection system of the low-voltage transformer area according to claim 8, wherein when the control module calculates a control signal of the current transformer by using the current command, a current deviation between the current command and an actual current value is calculated, the current deviation is sent to the second PI controller to obtain an ac voltage correction value, and the control signal of the current transformer is generated according to the ac voltage correction value.
14. The low voltage bay flexible interconnect system control of claim 13, wherein said second PI controller is configured to control the operation of said second PI controller byCalculating to obtain an alternating voltage correction value, wherein k is pi And k ii Respectively a proportional control parameter and an integral control parameter of the second PI controller, s is a Laplacian operator,/and a third PI controller, and a fourth PI controller is a control parameter of the second PI controller>And->D-axis current command and q-axis current command, I d,k And I q,k The d-axis current actual value and the q-axis current actual value, respectively.
15. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the low voltage bay flexible interconnect system control method of any of claims 1-7 when the computer program is executed by the processor.
16. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor realizes the steps of the low voltage bay flexible interconnect system control method of any of claims 1-7.
CN202311032680.0A 2023-08-16 2023-08-16 Control method, device, equipment and medium for flexible interconnection system of low-voltage transformer area Pending CN117254443A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311032680.0A CN117254443A (en) 2023-08-16 2023-08-16 Control method, device, equipment and medium for flexible interconnection system of low-voltage transformer area

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311032680.0A CN117254443A (en) 2023-08-16 2023-08-16 Control method, device, equipment and medium for flexible interconnection system of low-voltage transformer area

Publications (1)

Publication Number Publication Date
CN117254443A true CN117254443A (en) 2023-12-19

Family

ID=89128424

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311032680.0A Pending CN117254443A (en) 2023-08-16 2023-08-16 Control method, device, equipment and medium for flexible interconnection system of low-voltage transformer area

Country Status (1)

Country Link
CN (1) CN117254443A (en)

Similar Documents

Publication Publication Date Title
US20210325922A1 (en) Method and apparatus for control of intelligent loads in microgrids
US10352298B2 (en) Wind generation system and controlling method thereof
CN107017615B (en) A kind of direct current electrical spring distributed control method and system based on consistency
CN109659941B (en) AC/DC hybrid micro-grid autonomous control method and system
TW202127787A (en) Ac load power supply system and method
CN110048398A (en) A kind of micro-capacitance sensor hierarchical coordinative control method and system based on energy router
Barragan et al. Operational benefits of multiterminal DC-links in active distribution networks
CN115864520A (en) Control method and system for accessing hybrid power grid based on high-proportion photovoltaic energy
CN115776130A (en) Grid-connected and off-grid switching method, energy storage converter, energy storage system and power system
Ahmed et al. A novel hybrid AC/DC microgrid architecture with a central energy storage system
CN109066762B (en) Flexible direct-current transmission alternating-current operation method
CN114744672A (en) Low voltage ride through control method and system for two-stage grid-connected photovoltaic system
Gkavanoudis et al. Fault ride-through capability of a microgrid with wtgs and supercapacitor storage during balanced and unbalanced utility voltage sags
CN108336743B (en) local voltage control method based on distributed power supply grid-connected inverter
Devaraj et al. Impact of fixed and variable speed wind turbine systems on power system voltage stability enhancement
CN112491028A (en) Improved droop control method and device for direct current system and storage medium
CN109301833B (en) AC/DC series-parallel power grid power transmission section overload control method based on path stripping
CN116031920A (en) Hierarchical energy coordination control strategy for multiport power electronic equipment
CN117254443A (en) Control method, device, equipment and medium for flexible interconnection system of low-voltage transformer area
Song et al. A novel adaptive observer-based DC-link voltage control for grid-connected power converters
Callegari et al. Coordinated volt-var control in microgrids
CN111146824A (en) Electric energy control processing method and device
CN113300393B (en) Direct-current micro-grid battery energy storage energy management method, management equipment and storage medium
Herman et al. Voltage profile support in LV distribution networks with distributed generation
CN113991757B (en) Low-voltage direct-current flexible interconnection power control method, system and device for communication-free lower station area and storage medium

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