CN114726218A - Direct-current transformer control system and control method - Google Patents

Direct-current transformer control system and control method Download PDF

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Publication number
CN114726218A
CN114726218A CN202110013303.7A CN202110013303A CN114726218A CN 114726218 A CN114726218 A CN 114726218A CN 202110013303 A CN202110013303 A CN 202110013303A CN 114726218 A CN114726218 A CN 114726218A
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CN
China
Prior art keywords
module
power module
power
controller
transformer
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Pending
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CN202110013303.7A
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Chinese (zh)
Inventor
胡四全
孟学磊
张振兴
柴卫强
马太虎
周辉
樊宏伟
赵洋洋
慕小乐
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Xuji Group Co Ltd
XJ Electric Co Ltd
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Xuji Group Co Ltd
XJ Electric Co Ltd
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Priority to CN202110013303.7A priority Critical patent/CN114726218A/en
Publication of CN114726218A publication Critical patent/CN114726218A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • 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]

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

Abstract

The invention discloses a control system and a control method of a direct current transformer, wherein the control system of the direct current transformer comprises the following components: the central controller and the module controllers are connected by optical fibers; the module controllers correspond to the power modules one to one; the central controller acquires the operation data of a plurality of power modules and acquires the modulation waves of the corresponding power modules; the central controller sends control instructions to the plurality of module controllers according to a preset period, wherein the control instructions comprise: modulating waves, power module numbers and power module state information; and the module controller obtains a triangular carrier wave according to the power module number and the power module state information, and compares the triangular carrier wave with the modulation wave to obtain a control command of the power module. By adopting the two-layer controller architecture, the communication frequency is greatly reduced while the control precision is ensured, the requirement on the computing capacity of the main controller and the workload of the main controller of the direct-current transformer are reduced, and the operation efficiency of the main controller of the direct-current transformer is improved.

Description

Direct-current transformer control system and control method
Technical Field
The invention relates to the technical field of power equipment control, in particular to a direct-current transformer control system and a direct-current transformer control method.
Background
The dc transformer generally has an IGBT module structure, and the number of modules included in the dc transformer varies according to the voltage class. Generally, the higher the voltage level, the more modules. In order to obtain a smooth curve, the switching frequency of a module power element is generally high, and switching is often performed thousands of times in 1 second.
Disclosure of Invention
The invention aims to provide a direct current transformer control system and a control method, which adopt a two-layer controller framework of a central processing unit and a module controller, greatly reduce communication frequency while ensuring control precision, reduce the requirement on the computing capacity of a main controller, reduce the workload of the direct current transformer main controller, and improve the operation efficiency of the direct current transformer main controller.
In order to solve the above technical problem, a first aspect of an embodiment of the present invention provides a dc transformer control system, where a dc transformer includes a plurality of power modules, and includes: the central controller and the module controllers are connected by optical fibers;
the module controllers correspond to the power modules one to one;
the central controller acquires the operation data of the plurality of power modules and obtains the modulation waves of the corresponding power modules;
the central controller sends control instructions to the module controllers according to a preset period, wherein the control instructions comprise: modulating waves, power module numbers and power module state information;
and the module controller obtains a triangular carrier wave according to the power module number and the power module state information, and compares the triangular carrier wave with the modulation wave to obtain a control command of the power module.
Further, the module controller performs traversal calculation on the state information of the power module to obtain the number of faults of the power module and the number of faults of the power module smaller than the position number of the power module, and calculates the offset angle of the triangular carrier of the power module.
Further, the offset angle θ of the triangular carrier of the power module is calculated as:
θ＝(n-x1)*2π/(m-x)；
in the formula, n is a module number corresponding to the sub-module, m is the total number of the modules of the direct-current transformer, x is the total number of fault modules calculated by the sub-module after traversing according to the module state information, and x1 is the total number of the fault modules with the module number smaller than the module number.
Further, the control instructions further comprise: synchronization instructions for identifying the power module reference phase;
the issuing period of the synchronous instruction is positively correlated with the carrier period generated by the module controller;
and after receiving the synchronization instruction, the module controller restores the corresponding triangular carrier to an initial state.
Further, the issuing period of the synchronization instruction is an integral multiple of the carrier period.
Accordingly, a second aspect of the embodiments of the present invention provides a method for controlling a dc transformer, where the dc transformer is controlled by any one of the above dc transformer control systems, the dc transformer includes a plurality of power modules, and the method includes the following steps:
acquiring operation data of a plurality of power modules through a central controller;
calculating to obtain a modulation wave of the power module according to the operation data;
sending the control instruction containing the modulation wave to the corresponding module controller;
controlling the module controller to obtain a triangular carrier of the power module according to the power module number and the power module state information in the control instruction;
and comparing the triangular carrier wave with the modulation wave to obtain a control command of the power module.
Further, the control instructions further comprise: a synchronization instruction;
the direct current transformer control method further comprises the following steps:
and after receiving the synchronization instruction, the module controller restores the corresponding triangular carrier to the initial state.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
by adopting the two-layer controller framework of the central processing unit and the module controller, the communication frequency is greatly reduced while the control precision is ensured, the requirement on the computing capacity of the main controller is reduced, the workload of the main controller of the direct-current transformer is reduced, and the operation efficiency of the main controller of the direct-current transformer is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a power module of a dc transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a dc transformer control system according to an embodiment of the present invention;
fig. 3 is a flowchart of a dc transformer control method according to an embodiment of the present invention;
fig. 4 is a logic diagram of a dc transformer control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic circuit diagram of a power module of a dc transformer according to an embodiment of the present invention.
Referring to fig. 1, one of the power modules of the dc transformer, Q1-Q10, is a power component of the controllable switch. The high-voltage side half bridge 1-B1 bridge (Buck-Boost half bridge) is formed by Q9 and Q10, the high-voltage side H bridge is formed by Q1-Q4, and the low-voltage side H bridge is formed by Q5-Q8. The central controller generates a modulation wave of a B1 bridge by monitoring and calculating the module operation parameters, and issues the serial number of each power module and the state information of all the power modules.
FIG. 2 is a schematic diagram of a DC transformer control system according to an embodiment of the present invention
Referring to fig. 2, a first aspect of an embodiment of the present invention provides a dc transformer control system, where a dc transformer includes a plurality of power modules, including: a central controller connected by optical fibers and a plurality of module controllers. The module controllers correspond to the power modules one to one; the central controller acquires the operation data of a plurality of power modules and acquires the modulation waves of the corresponding power modules; the central controller sends control instructions to the plurality of module controllers according to a preset period, wherein the control instructions comprise: modulating waves, power module numbers and power module state information; and the module controller obtains a triangular carrier wave according to the power module number and the power module state information, and compares the triangular carrier wave with the modulation wave to obtain a control command of the power module.
The direct current transformer control system is divided into two control levels, namely a central controller and a module controller. The central controller is connected with the module controller through optical fibers. Each module controller correspondingly controls one power module.
According to the direct current transformer control system, the two-layer controller framework of the central processing unit and the module controller is adopted, the control precision is guaranteed, meanwhile, the communication frequency is greatly reduced, the requirement on the computing capacity of the main controller is lowered, the workload of the direct current transformer main controller is lowered, and the operation efficiency of the direct current transformer main controller is improved.
Specifically, the module controller performs traversal calculation on the state information of the power module to obtain the number of faults of the power module and the number of faults of the power module smaller than the position number of the power module, and calculates the offset angle of the triangular carrier of the power module.
Further, the offset angle θ of the triangular carrier of the power module is calculated as:
θ＝(n-x1)*2π/(m-x)；
in the formula, n is a module number corresponding to the sub-module, m is the total number of the modules of the direct-current transformer, x is the total number of fault modules calculated by the sub-module after traversing according to the module state information, and x1 is the total number of the fault modules with the module number smaller than the module number.
Specifically, as shown in table 1, the control command includes: frame header, modulation wave, power module number, power module state information, other control instructions and verification. Optionally, the control instruction further includes: synchronization instructions for identifying a power module reference phase; the issuing period of the synchronous instruction is positively correlated with the carrier period generated by the module controller; and after receiving the synchronization instruction, the module controller restores the corresponding triangular carrier wave to the initial state.
Further, the issuing period of the synchronization instruction is an integral multiple of the carrier period. Preferably, the transmission cycle of the synchronization command is more than 10 times of the carrier cycle.
Fig. 3 is a flowchart of a dc transformer control method according to an embodiment of the present invention;
fig. 4 is a logic diagram of a dc transformer control method according to an embodiment of the present invention.
Accordingly, referring to fig. 3 and 4, a second aspect of the embodiments of the present invention provides a method for controlling a dc transformer, where the dc transformer is controlled by any one of the dc transformer control systems, the dc transformer includes a plurality of power modules, and the method includes the following steps:
and S100, acquiring the operation data of a plurality of power modules through a central controller.
And S200, calculating to obtain the modulation wave of the power module according to the operation data.
And S300, sending a control command containing the modulation wave to a corresponding module controller.
And S400, the control module controller obtains the triangular carrier of the power module according to the power module number and the power module state information in the control instruction.
And S500, comparing the triangular carrier wave with the modulation wave to obtain a control command of the power module.
According to the control method of the direct current transformer, the two-layer controller framework of the central processing unit and the module controller is adopted, the control precision is guaranteed, meanwhile, the communication frequency is greatly reduced, the requirement on the computing capacity of the main controller is lowered, the workload of the main controller of the direct current transformer is lowered, and the operation efficiency of the main controller of the direct current transformer is improved.
Specifically, the module controller judges the received power module state information at regular time, and if the received power module state information is inconsistent with the previous state, traversal calculation is performed; and obtaining the total number of the faults of the power modules and the number of the fault modules with the numbers smaller than the number of the power module through traversal. Assuming that m power modules are provided, m bits are used for representing the states of the power modules, each bit standard corresponds to one power module, the module fault is set to be 1, and if not, the module fault is set to be 0, and the power modules are arranged according to the serial number sequence of the power modules.
And calculating the offset angle of the power module according to a formula theta (n-x1) × 2 pi/(m-x), generating a corresponding triangular carrier wave, and comparing the generated triangular carrier wave with the modulation wave to obtain a control command of the power module.
Further, the control instructions further comprise: and (5) synchronizing the instructions. Therefore, the above dc transformer control method further includes:
and after receiving the synchronization instruction, the module controller restores the corresponding triangular carrier to the initial state.
The embodiment of the invention aims to protect a control system and a control method of a direct current transformer, wherein the direct current transformer comprises a plurality of power modules, and the control system of the direct current transformer comprises: the central controller and the module controllers are connected by optical fibers; the module controllers correspond to the power modules one to one; the central controller acquires the operation data of a plurality of power modules and obtains the modulation waves of the corresponding power modules; the central controller sends control instructions to the plurality of module controllers according to a preset period, wherein the control instructions comprise: modulating waves, power module numbers and power module state information; and the module controller obtains a triangular carrier wave according to the power module number and the power module state information, and compares the triangular carrier wave with the modulation wave to obtain a control command of the power module. The technical scheme has the following effects:
by adopting the two-layer controller framework of the central processing unit and the module controller, the communication frequency is greatly reduced while the control precision is ensured, the requirement on the computing capacity of the main controller is reduced, the workload of the main controller of the direct-current transformer is reduced, and the operation efficiency of the main controller of the direct-current transformer is improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundary of the appended claims, or the equivalents of such scope and boundary.

Claims (7)

1. A dc transformer control system, wherein the dc transformer includes a plurality of power modules, comprising: the central controller and the module controllers are connected by optical fibers;
the module controllers correspond to the power modules one to one;
the central controller acquires the operation data of the plurality of power modules and obtains the modulation waves of the corresponding power modules;
the central controller sends control instructions to the module controllers according to a preset period, wherein the control instructions comprise: modulating waves, power module numbers and power module state information;
and the module controller obtains a triangular carrier wave according to the power module number and the power module state information, and compares the triangular carrier wave with the modulation wave to obtain a control command of the power module.
2. The DC transformer control system of claim 1,
and the module controller performs traversal calculation on the state information of the power module to obtain the fault number of the power module and the fault number of the power module smaller than the position number of the power module, and calculates the offset angle of the triangular carrier of the power module.
3. The DC transformer control system of claim 2,
the calculation formula of the offset angle theta of the triangular carrier of the power module is as follows:
θ＝(n-x1)*2π/(m-x)；
in the formula, n is a module number corresponding to the sub-module, m is the total number of the modules of the direct-current transformer, x is the total number of fault modules calculated by the sub-module after traversing according to the module state information, and x1 is the total number of the fault modules with the module number smaller than the module number.
4. The DC transformer control system of claim 1,
the control instructions further comprise: synchronization instructions for identifying the power module reference phase;
the issuing period of the synchronous instruction is positively correlated with the carrier period generated by the module controller;
and after receiving the synchronization instruction, the module controller restores the corresponding triangular carrier to the initial state.
5. The DC transformer control system of claim 4,
and the issuing period of the synchronous instruction is integral multiple of the carrier period.
6. A method for controlling a dc transformer, wherein the dc transformer is controlled by the dc transformer control system according to any one of claims 1 to 5, the dc transformer comprises a plurality of power modules, and the method comprises the following steps:
acquiring operation data of a plurality of power modules through a central controller;
calculating to obtain a modulation wave of the power module according to the operation data;
sending the control instruction containing the modulation wave to the corresponding module controller;
controlling the module controller to obtain a triangular carrier of the power module according to the power module number and the power module state information in the control instruction;
and comparing the triangular carrier wave with the modulation wave to obtain a control command of the power module.
7. The DC transformer control method according to claim 6,
the control instructions further comprise: a synchronization instruction;
the direct current transformer control method further comprises the following steps:
and after receiving the synchronization instruction, the module controller restores the corresponding triangular carrier to the initial state.
CN202110013303.7A 2021-01-06 2021-01-06 Direct-current transformer control system and control method Pending CN114726218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110013303.7A CN114726218A (en) 2021-01-06 2021-01-06 Direct-current transformer control system and control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110013303.7A CN114726218A (en) 2021-01-06 2021-01-06 Direct-current transformer control system and control method

Publications (1)

Publication Number Publication Date
CN114726218A true CN114726218A (en) 2022-07-08

Family

ID=82233744

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110013303.7A Pending CN114726218A (en) 2021-01-06 2021-01-06 Direct-current transformer control system and control method

Country Status (1)

Country Link
CN (1) CN114726218A (en)

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