CN116488431A - Control system applied to power electronic transformer - Google Patents
Control system applied to power electronic transformer Download PDFInfo
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- CN116488431A CN116488431A CN202310521639.3A CN202310521639A CN116488431A CN 116488431 A CN116488431 A CN 116488431A CN 202310521639 A CN202310521639 A CN 202310521639A CN 116488431 A CN116488431 A CN 116488431A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 25
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- 230000001360 synchronised effect Effects 0.000 claims description 19
- 230000010363 phase shift Effects 0.000 claims description 14
- 230000003993 interaction Effects 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 230000009977 dual effect Effects 0.000 claims description 2
- 230000006854 communication Effects 0.000 abstract description 23
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- 230000001960 triggered effect Effects 0.000 abstract description 4
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- 238000004364 calculation method Methods 0.000 description 9
- 230000000903 blocking effect Effects 0.000 description 3
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- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009432 framing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a control system applied to a power electronic transformer. The design adopts the core ideas of function division, time division multiplexing and buffer storage, and the control system is divided into different control units 'HMI touch display screen-interface board-main control board-auxiliary control board-high-voltage power board-low-voltage power board' according to functions. The whole machine communication is triggered by a unified signal, and partial data is processed by adopting the last cached data. The control system core architecture adopts an ARM+DSP+FPGA structure, an auxiliary control board and a high-voltage power board, and a high-voltage power board and a low-voltage power board adopt independent channel 1V1 data transmission, and control flow and information flow adopt double bus transmission; the modulation algorithm is separated from cascade module data processing, the cascade module data processing is executed in an auxiliary control board FPGA, all levels of cascade module communication data are processed in parallel, the modulation algorithm is executed in a main control board DSP, and the later cascade module expansion is realized.
Description
Technical Field
The invention relates to the technical field of power electronic transformer control, in particular to a control system applied to a power electronic transformer.
Background
The power electronic transformer is a novel intelligent transformer for realizing voltage conversion and energy transfer in a power system by utilizing a power electronic conversion technology, and the design idea is to replace a power frequency transformer with a high-frequency transformer. The power electronic transformer is used as a comprehensive energy management node, and not only can realize the functions of voltage class conversion, electric isolation between input and output, energy transfer and the like, but also has the functions of new energy grid connection, harmonic wave treatment, reactive power compensation, grid interconnection and the like. Therefore, the power electronic transformer can be widely applied to the fields of multi-element distributed renewable energy access, intelligent micro-grid, power distribution system, energy internet and the like, and has important significance for improving the electric energy quality of a power grid, improving the comprehensive energy utilization rate and enhancing the flexible access and flexible networking capability of the system.
The power electronic transformer generally adopts a modularized cascading topology and is generally composed of a high-voltage module, a high-frequency transformer, a low-voltage module and the like. The high-voltage module positioned near one end of the medium-voltage power grid is directly connected with the 10kV power grid, comprises a cascade H bridge and a double-active bridge high-voltage side (SRC-DACH), and mainly has the function of absorbing energy required by a load from the power grid and transmitting the energy to the low-voltage module through a high-frequency transformer. The low-voltage module positioned near one end of the low-voltage load is directly connected with a 750V direct-current bus, comprises a double-active bridge low-voltage side (SRC-DABL), and mainly has the function of utilizing energy transmitted by the high-voltage module to establish direct-current bus voltage to be provided for the load. The modular cascading topology of the power electronic transformer improves the reliability and stability of the system, and facilitates the expansion of the voltage class and the power class of the system.
The traditional power electronic transformer control generally adopts a 'one-host multi-slave' control mode, the slave completes the voltage and current quantity data acquisition of the cascade module and the execution of a driving instruction, and the host is responsible for the functions of communication interaction, data analysis, modulation algorithm calculation, fault protection processing and the like of each slave module. With the increase of the number of cascade modules, the data interaction amount is large, the corresponding time required for data transmission, logic judgment, algorithm calculation and framing assignment is relatively long, the cost of host computer calculation and communication resources is large, the program change amount is large, the updating of analog quantity information such as voltage, current and temperature of each cascade module and the updating of switch state quantity information are asynchronous, and the problems of communication blocking of data flow and control flow in a communication bus and the like occur.
Disclosure of Invention
The invention aims at the defects and the shortcomings of the prior art, provides a control system applied to a power electronic transformer, adopts the core ideas of function division, time division multiplexing and buffer storage, and divides the control system into different control units 'HMI touch display screen-interface board-main control board-auxiliary control board-high-voltage power board-low-voltage power board'. The whole machine communication is triggered by a unified signal, and partial data is processed by adopting the last cached data. With the increase of the number of cascade modules, the data interaction amount is large, the corresponding time required for data transmission, logic judgment, algorithm calculation and framing assignment is relatively long, the cost of host computer calculation and communication resources is large, the program change amount is large, the updating of analog quantity information such as voltage, current and temperature of each cascade module and the updating of switch state quantity information are asynchronous, and the problems of communication blocking of data flow and control flow in a communication bus and the like occur. The complexity of the system control can be simplified.
In order to achieve the above purpose, the technical scheme of the invention is as follows: a control system applied to a power electronic transformer comprises an HMI touch display screen, an interface board, a main control board, an auxiliary control board, a high-voltage power board and a low-voltage power board;
the HMI touch display screen is used for displaying the current system state information and issuing the control parameters of the whole machine;
the interface board is used for data interaction with the whole machine auxiliary equipment, the HMI touch display screen and the main control board;
the main control board is used for collecting power grid voltage, power grid current and analog quantity data, calculating a system three-phase ABC modulation wave comparison value and a carrier phase shift value, and interacting with the interface board and the auxiliary control board data;
the auxiliary control board is used for data summarizing, fault processing and data wave recording of the high-low voltage power units, and calculating the average value of the busbar voltage of the cascade H bridge, the average value of the busbar voltage of the SRC-DABL, the average value of the output current of the SRC-DABL and the number of cascade submodules, and is used for generating cascade H bridge synchronous pulse signals, SRC-DACH and SRC-DABL synchronous pulse signals, and exchanging data with the high-voltage power board and the main control board;
the high-voltage power board is used for collecting and calculating bus voltage, resonant current and resonant frequency of the cascade H bridge, outputting driving control to the cascade H bridge and SRC-DACH power devices, interacting with an auxiliary control board and low-voltage power board data, and transmitting high-voltage module voltage, high-voltage module resonant current, high-voltage module temperature, high-voltage module fault state, module redundancy state, transformer temperature, low-voltage module voltage, low-voltage module resonant current, low-voltage module output current, low-voltage module temperature and low-voltage module fault state;
the low-voltage power board is used for acquiring and calculating SRC-DABL bus voltage, resonant current and resonant frequency, outputting drive control to the SRC-DABL power device, interacting with high-voltage power board data and transmitting transformer temperature, low-voltage module voltage, low-voltage module resonant current, low-voltage module output current, low-voltage module temperature and low-voltage module fault state information;
the HMI touch display screen is connected with the interface board through a network cable, the interface board is connected with the main control board through a UART serial port, the main control board is connected with the auxiliary control board through an EMIF interface, the auxiliary control board is connected with the high-voltage power board through an optical fiber interface, and the high-voltage power board is connected with the low-voltage power board through an optical fiber interface;
the information flow transmission direction of the control system of the power electronic transformer is as follows: the control system comprises a low-voltage power board, a high-voltage power board, an auxiliary control board, a main control board, an interface board and an HMI touch display screen;
the control system of the power electronic transformer controls the flow transmission direction to be: HMI touch display screen-interface board-main control board-auxiliary control board-high-voltage power board-low-voltage power board.
In one embodiment of the present invention, a control system control flow and an information flow of a power electronic transformer adopt dual bus transmission, including: the system comprises a starting instruction, a stopping instruction, a fault clearing instruction, a resetting instruction, a system working mode, a module enabling state, an ABC three-phase modulation wave comparison value and a carrier phase shift value, a cascade H bridge synchronous pulse signal, SRC-DACH and SRC-DABL synchronous pulse signals.
In an embodiment of the present invention, the control system information flow of the power electronic transformer includes: system insulation detection, fan equipment rotating speed, metering equipment parameters, uninterruptible Power Supply (UPS) equipment electric quantity, power grid voltage, power grid current, power grid frequency, auxiliary control fault state, cascading H bridge bus voltage average value, SRC-DABL output current average value, cascading submodule number, high voltage module voltage, high voltage module resonance current, high voltage module temperature, transformer temperature, low voltage module voltage, low voltage module resonance current, low voltage module temperature, system starting state, module redundancy state, fault state and prompt.
In one embodiment of the present invention, the low voltage power board is connected to the high voltage power board through an optical fiber interface, and is used for transmitting transformer temperature, low voltage module voltage, low voltage module resonance current, low voltage module output current, low voltage module temperature and low voltage module fault state information.
In an embodiment of the present invention, the high voltage power board is connected to the auxiliary control board through an optical fiber interface, and is used for transmitting a high voltage module voltage, a high voltage module resonant current, a high voltage module temperature, a high voltage module fault state, a module redundancy state, a transformer temperature, a low voltage module voltage, a low voltage module resonant current, a low voltage module output current, a low voltage module temperature, and a low voltage module fault state.
In an embodiment of the present invention, the auxiliary control board is connected to the main control board through an EMIF interface, and is used for transmitting an auxiliary control fault state, a cascade H-bridge bus voltage average value, an SRC-DABL output current average value, a cascade submodule number, a summarized high-voltage module fault state, and a summarized low-voltage module fault state.
In an embodiment of the present invention, the main control board is connected to the interface board through a UART interface, and is used for transmitting a power grid voltage, a power grid current, a power grid frequency, an auxiliary control fault state, a cascade H bridge bus voltage average value, an SRC-DABL output current average value, a cascade submodule number, a summarized high-voltage module fault state, and a summarized low-voltage module fault state.
In an embodiment of the present invention, the interface board is connected to the HMI touch display screen through a network port, and is used for transmitting system insulation detection, a fan device rotation speed, a metering device parameter, an Uninterruptible Power Supply (UPS) device power, a power grid voltage, a power grid current, a power grid frequency, an auxiliary control fault state, a cascade H-bridge bus voltage average value, an SRC-DABL output current average value, a cascade submodule number, a summarized high-voltage module fault state, and a summarized low-voltage module fault state.
In an embodiment of the present invention, the HMI touch display is connected to the interface board through an optical fiber interface, and is used for transmitting a start command, a stop command, a fault clearing command, a reset command, a system working mode, and a module enabling state.
In an embodiment of the present invention, the interface board is connected to the interface board through a UART serial port, and is used for transmitting a start command, a stop command, a fault clearing command, a reset command, a system working mode, and a module enabling state.
In an embodiment of the present invention, the main control board is connected to the interface board through an EMIF interface, and is used for transmitting a start command, a stop command, a fault clearing command, a reset command, a system working mode, a module enabling state, a system three-phase ABC modulation wave comparison value and a carrier phase shift value.
In an embodiment of the present invention, the auxiliary control board is connected to the high voltage power board through an optical fiber interface, and is used for a start command, a stop command, a fault clearing command, a reset command, a system working mode, a module enabling state, a cascade H-bridge modulation wave comparison value and a carrier phase shift value, a cascade H-bridge synchronization pulse signal, and SRC-DABH and SRC-DABL synchronization pulse signals.
In an embodiment of the present invention, the high voltage power board is connected to the low voltage power board through an optical fiber interface, and is used for starting command, stopping command, fault clearing command, resetting command, system working mode, module enabling state, SRC-DACH and SRC-DABL synchronous pulse signals.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a control system applied to a power electronic transformer, which is designed with the core ideas of function division, time division multiplexing and buffer storage, and the control system is divided into different control units according to functions, namely an HMI touch display screen, an interface board, a main control board, an auxiliary control board, a high-voltage power board and a low-voltage power board. The whole machine communication is triggered by a unified signal, and partial data is processed by adopting the last cached data. With the increase of the number of cascade modules, the data interaction amount is large, the corresponding time required for data transmission, logic judgment, algorithm calculation and framing assignment is relatively long, the cost of host computer calculation and communication resources is large, the program change amount is large, the updating of analog quantity information such as voltage, current and temperature of each cascade module and the updating of switch state quantity information are asynchronous, and the problems of communication blocking of data flow and control flow in a communication bus and the like occur. The complexity of the system control can be simplified. Meanwhile, the auxiliary control adopts an FPGA controller and reserves 6 pairs of fiber communication ports, so that the number of later-stage cascade modules can be flexibly configured, and different customization demands can be met.
Drawings
Fig. 1 is a diagram of a power electronic transformer control system according to the present invention.
FIG. 2 is a block diagram of a cascade module according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Examples:
a control system applied to a power electronic transformer as shown in FIG. 1 comprises AN HMI touch display screen, AN interface board, a main control board, AN auxiliary control board, high-voltage power boards (A1-AN) and low-voltage power boards (A1-AN).
As shown in fig. 2, the cascade module of the present invention includes a high voltage module, a transformer, and a low voltage module; the high-voltage module comprises a cascade H bridge and an SRC-DACH circuit, and the low-voltage module is an SRC-DABL circuit.
The HMI touch display screen is used for displaying the current system state information and issuing the control parameters of the whole machine.
And the interface board is used for data interaction with the whole auxiliary equipment, the HMI touch display screen and the main control board.
The main control board is used for collecting power grid voltage, power grid current and analog quantity data, calculating a comparison value of the system three-phase ABC modulation wave and a carrier phase shift value, and interacting with the interface board and the auxiliary control board.
The auxiliary control board is used for data summarizing, fault processing and data wave recording of the high-low voltage power units, and calculating the average value of the busbar voltage of the cascade H bridge, the average value of the busbar voltage of the SRC-DABL, the average value of the output current of the SRC-DABL and the number of the cascade submodules, and is used for generating cascade H bridge synchronous pulse signals, SRC-DACH and SRC-DABL synchronous pulse signals and interacting with the high-voltage power board and the main control board.
The high-voltage power board is used for collecting and calculating bus voltage, resonant current and resonant frequency of the cascade H bridge, outputting driving control to the cascade H bridge and SRC-DACH power devices and data interaction with the auxiliary control and low-voltage power board.
The low-voltage power board is used for acquiring and calculating the voltage, the resonant current and the resonant frequency of the SRC-DABL bus, outputting the driving control of the SRC-DABL power device and interacting with the data of the high-voltage power board.
The connection relation is that the HMI touch display screen is connected with the interface board through a network cable, the interface board is connected with the main control board through a UART serial port, the main control board is connected with the auxiliary control board through an external memory interface (EMIF interface), the auxiliary control board is connected with the high-voltage power unit through an optical fiber interface, and the high-voltage power unit is connected with the low-voltage power unit through the optical fiber interface.
The main transmission direction of the information flow of the control system of the power electronic transformer is as follows: the system comprises a low-voltage power board, a high-voltage power board, an auxiliary control board, a main control board, an interface board and an HMI touch display screen.
The main transmission direction of the control flow of the control system of the power electronic transformer is as follows: HMI touch display screen-interface board-main control board-auxiliary control board-high-voltage power board-low-voltage power board.
The control system control flow and the information flow of the power electronic transformer adopt double-bus transmission, and the problem of communication blockage between the data flow and the control flow in the communication bus is solved.
The control system information flow of the power electronic transformer includes, but is not limited to, the following information: system insulation detection, fan equipment rotating speed, metering equipment parameters, uninterruptible Power Supply (UPS) equipment electric quantity, power grid voltage, power grid current, power grid frequency, auxiliary control fault state, cascading H bridge bus voltage average value, SRC-DABL output current average value, cascading submodule number, high voltage module voltage, high voltage module resonance current, high voltage module temperature, transformer temperature, low voltage module voltage, low voltage module resonance current, low voltage module temperature, system starting state, module redundancy state, fault state and prompt.
In a control system information flow transmission path of the power electronic transformer, a low-voltage power board is connected with a high-voltage power board through an optical fiber interface and is used for transmitting transformer temperature, low-voltage module voltage, low-voltage module resonance current, low-voltage module output current, low-voltage module temperature and low-voltage module fault state information.
In a control system information flow transmission path of the power electronic transformer, the high-voltage power board is connected with the auxiliary control board through an optical fiber interface and is used for transmitting high-voltage module voltage, high-voltage module resonance current, high-voltage module temperature, high-voltage module fault state, module redundancy state, transformer temperature, low-voltage module voltage, low-voltage module resonance current, low-voltage module output current, low-voltage module temperature and low-voltage module fault state.
In a control system information flow transmission path of the power electronic transformer, an auxiliary control board is connected with a main control board through an EMIF interface and used for transmitting an auxiliary control fault state, a cascading H bridge bus voltage average value, an SRC-DABL output current average value, the number of cascading submodules, a summarized high-voltage module fault state and a summarized low-voltage module fault state.
In a control system information flow transmission path of the power electronic transformer, a main control board is connected with an interface board through a UART interface and used for transmitting power grid voltage, power grid current, power grid frequency, auxiliary control fault states, cascading H bridge bus voltage average values, SRC-DABL output current average values, cascading submodule numbers, summarized high-voltage module fault states and summarized low-voltage module fault states.
In a control system information flow transmission path of the power electronic transformer, an interface board is connected with an HMI touch display screen through a network port and used for transmitting system insulation detection, fan equipment rotating speed, metering equipment parameters, uninterruptible Power Supply (UPS) equipment electric quantity, power grid voltage, power grid current, power grid frequency, auxiliary control fault states, cascading H bridge bus voltage average values, SRC-DABL output current average values, cascading submodule quantity, summarized high-voltage module fault states and summarized low-voltage module fault states.
The control system control flow of the power electronic transformer includes, but is not limited to, the following information: the system comprises a starting instruction, a stopping instruction, a fault clearing instruction, a resetting instruction, a system working mode, a module enabling state, an ABC three-phase modulation wave comparison value and a carrier phase shift value, a cascade H bridge synchronous pulse signal, SRC-DACH and SRC-DABL synchronous pulse signals.
In a control flow transmission path of a control system of the power electronic transformer, an HMI touch display screen is connected with an interface board through an optical fiber interface and is used for transmitting a starting instruction, a stopping instruction, a fault clearing instruction, a resetting instruction, a system working mode and a module enabling state.
In a control flow transmission path of a control system of the power electronic transformer, an interface board is connected with the interface board through a UART serial port and is used for transmitting a start instruction, a stop instruction, a fault clearing instruction, a reset instruction, a system working mode and a module enabling state.
In a control flow transmission path of a control system of the power electronic transformer, a main control board is connected with an interface board through an EMIF interface and is used for transmitting a start instruction, a stop instruction, a fault clearing instruction, a reset instruction, a system working mode, a module enabling state, a system three-phase ABC modulation wave comparison value and a carrier phase shift value.
In a control system control flow transmission path of the power electronic transformer, an auxiliary control board is connected with a high-voltage power board through an optical fiber interface and is used for starting instructions, stopping instructions, fault clearing instructions, resetting instructions, system working modes, module enabling states, cascade H bridge modulation wave comparison values and carrier phase shift values, cascade H bridge synchronous pulse signals, SRC-DACH and SRC-DABL synchronous pulse signals.
In a control flow transmission path of a control system of the power electronic transformer, a high-voltage power board is connected with a low-voltage power board through an optical fiber interface and is used for starting instructions, stopping instructions, fault clearing instructions, resetting instructions, a system working mode, a module enabling state, SRC-DACH and SRC-DABL synchronous pulse signals.
The HMI touch display screen adopts a touch screen, the working temperature and the storage temperature reach the range of minus 30 ℃ to 85 ℃, and the brightness is more than 500 nits.
The interface board adopts an ARM controller and performs data interaction with auxiliary equipment of the whole machine through an RS485 bus, including but not limited to insulation detection equipment, fan equipment, metering equipment and Uninterruptible Power Supply (UPS) equipment.
The main control board adopts a DSP controller, and acquires 10kV alternating-current side voltage through a voltage transformer and acquires 10kV alternating-current side current through a current transformer.
The main control board calculates ABC three-phase modulation wave comparison values and carrier phase shift values by using a carrier horizontal phase shift SPWM-based modulation algorithm through cascading H bridge busbar voltage average values, power grid voltages, power grid currents and cascading submodules.
The high-voltage module and the low-voltage module are not used in the calculation process of the modulation algorithm of the main control board, only the average value of the cascaded H-bridge bus voltage and the number of cascaded submodules uploaded by the auxiliary control board are used, the calculation and communication resource overhead of the main control board cannot be influenced along with the increase of the number of the cascaded submodules, and the program universality of the main control board is good.
The auxiliary control board adopts an FPGA controller for summarizing fault states of the high-voltage modules and summarizing fault states of the low-voltage modules to generate fault state word information, programs in the FPGA are executed in parallel, and the program module instantiation expansion can be conveniently carried out along with the increase of the number of the cascade modules.
The auxiliary control board calculates the average value of the cascade H bridge bus voltage, the average value of the SRC-DABL bus voltage and the average value of the SRC-DABL output current by using a rolling phase division method through the high-voltage module voltage, the low-voltage module output current and the number of cascade submodules.
The auxiliary control board is used as the time base of the cascade H-bridge carrier phase-shifting PWM period counter and the time base of the SRC-DAB module PWM period counter to respectively generate needed synchronous pulse signals at specific time of PWM period counting.
The high-voltage power board adopts an FPGA controller to collect the busbar voltage, the resonant current and the resonant frequency of the cascade H bridge, and outputs the output to drive and control the cascade H bridge and SRC-DACH power devices.
The low-voltage power board adopts an FPGA controller to collect SRC-DABL busbar voltage, resonant current and resonant frequency, and outputs the drive control of the SRC-DABL power device.
The auxiliary control board and the high-voltage power board, and the high-voltage power board and the low-voltage power board adopt single-channel 1V1 data transmission, and the existing communication channel transmission is not affected as the number of cascade modules increases.
The auxiliary control board reserves 6 pairs of optical fiber communication ports, so that the number of the later-stage cascade modules is convenient to flexibly configure, and different customization requirements are met;
the auxiliary control board, the high-voltage power board and the low-voltage power board adopt optical fiber communication, so that the communication isolation between the state data and the strong and weak current parts of the control instruction is realized.
The whole machine communication process is uniformly triggered by the main control board timer, partial data is processed by adopting the last cached data, and the problem that analog quantity information such as voltage, current and temperature of each cascade module and on-off state quantity information are updated and not synchronized is solved.
The above embodiments are illustrative of the specific embodiments of the present invention, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the invention, so that all such equivalent embodiments are intended to be within the scope of the invention.
Claims (10)
1. The control system applied to the power electronic transformer is characterized by comprising an HMI touch display screen, an interface board, a main control board, an auxiliary control board, a high-voltage power board and a low-voltage power board;
the HMI touch display screen is used for displaying the current system state information and issuing the control parameters of the whole machine;
the interface board is used for data interaction with the whole machine auxiliary equipment, the HMI touch display screen and the main control board;
the main control board is used for collecting power grid voltage, power grid current and analog quantity data, calculating a system three-phase ABC modulation wave comparison value and a carrier phase shift value, and interacting with the interface board and the auxiliary control board data;
the auxiliary control board is used for data summarizing, fault processing and data wave recording of the high-low voltage power units, and calculating the average value of the busbar voltage of the cascade H bridge, the average value of the busbar voltage of the SRC-DABL, the average value of the output current of the SRC-DABL and the number of cascade submodules, and is used for generating cascade H bridge synchronous pulse signals, SRC-DACH and SRC-DABL synchronous pulse signals, and exchanging data with the high-voltage power board and the main control board;
the high-voltage power board is used for collecting and calculating bus voltage, resonant current and resonant frequency of the cascade H bridge, outputting driving control to the cascade H bridge and SRC-DACH power devices, interacting with an auxiliary control board and low-voltage power board data, and transmitting high-voltage module voltage, high-voltage module resonant current, high-voltage module temperature, high-voltage module fault state, module redundancy state, transformer temperature, low-voltage module voltage, low-voltage module resonant current, low-voltage module output current, low-voltage module temperature and low-voltage module fault state;
the low-voltage power board is used for acquiring and calculating SRC-DABL bus voltage, resonant current and resonant frequency, outputting drive control to the SRC-DABL power device, interacting with high-voltage power board data and transmitting transformer temperature, low-voltage module voltage, low-voltage module resonant current, low-voltage module output current, low-voltage module temperature and low-voltage module fault state information;
the HMI touch display screen is connected with the interface board through a network cable, the interface board is connected with the main control board through a UART serial port, the main control board is connected with the auxiliary control board through an EMIF interface, the auxiliary control board is connected with the high-voltage power board through an optical fiber interface, and the high-voltage power board is connected with the low-voltage power board through an optical fiber interface;
the information flow transmission direction of the control system of the power electronic transformer is as follows: the control system comprises a low-voltage power board, a high-voltage power board, an auxiliary control board, a main control board, an interface board and an HMI touch display screen;
the control system of the power electronic transformer controls the flow transmission direction to be: HMI touch display screen-interface board-main control board-auxiliary control board-high-voltage power board-low-voltage power board.
2. A control system for a power electronic transformer according to claim 1, wherein the control and information flows are transmitted using a dual bus, comprising: the system comprises a starting instruction, a stopping instruction, a fault clearing instruction, a resetting instruction, a system working mode, a module enabling state, an ABC three-phase modulation wave comparison value and a carrier phase shift value, a cascade H bridge synchronous pulse signal, SRC-DACH and SRC-DABL synchronous pulse signals.
3. A control system for a power electronic transformer according to claim 1, wherein the information flow comprises: system insulation detection, fan equipment rotating speed, metering equipment parameters, uninterruptible power supply UPS equipment electric quantity, power grid voltage, power grid current, power grid frequency, auxiliary control fault state, cascading H bridge bus voltage average value, SRC-DABL output current average value, cascading submodule number, high voltage module voltage, high voltage module resonance current, high voltage module temperature, transformer temperature, low voltage module voltage, low voltage module resonance current, low voltage module temperature, system starting state, module redundancy state, fault state and prompt.
4. The control system for a power electronic transformer according to claim 1, wherein the auxiliary control board is connected to the main control board through an EMIF interface, and is configured to transmit an auxiliary control fault state, a cascade H-bridge bus voltage average value, an SRC-DABL output current average value, a cascade submodule number, a summarized high-voltage module fault state, and a summarized low-voltage module fault state.
5. The control system for a power electronic transformer according to claim 1, wherein the main control board is connected to the interface board through a UART interface, and is configured to transmit a power grid voltage, a power grid current, a power grid frequency, an auxiliary control fault state, a cascade H-bridge bus voltage average value, an SRC-DABL output current average value, a cascade submodule number, a summarized high-voltage module fault state, and a summarized low-voltage module fault state.
6. The control system for a power electronic transformer according to claim 1, wherein the interface board is connected to the HMI touch display screen through a network port and is used for transmitting system insulation detection, fan equipment rotation speed, metering equipment parameters, uninterruptible power supply UPS equipment electric quantity, power grid voltage, power grid current, power grid frequency, auxiliary control fault state, cascading H-bridge bus voltage average value, SRC-DABL output current average value, cascading submodule number, summarized high-voltage module fault state, summarized low-voltage module fault state.
7. The control system for a power electronic transformer according to claim 1, wherein the HMI touch screen is connected to the interface board through an optical fiber interface and is configured to transmit a start command, a stop command, a fault clearing command, a reset command, a system operation mode, and a module enabling state.
8. The control system for a power electronic transformer according to claim 1, wherein the interface board is connected to the interface board through a UART serial port, and is configured to transmit a start command, a stop command, a fault clearing command, a reset command, a system operation mode, and a module enabling state.
9. The control system for a power electronic transformer according to claim 1, wherein the main control board is connected to the interface board through an EMIF interface, and is configured to transmit a start command, a stop command, a fault clearing command, a reset command, a system operation mode, a module enable state, a system three-phase ABC modulation wave comparison value, and a carrier phase shift value.
10. The control system for a power electronic transformer according to claim 1, wherein the auxiliary control board is configured to transmit a start command, a stop command, a clear fault command, a reset command, a system operation mode, a module enable state, a cascaded H-bridge modulation wave comparison value and a carrier phase shift value, a cascaded H-bridge synchronization pulse signal, an SRC-DABH and an SRC-DABL synchronization pulse signal; the high-voltage power board is used for transmitting start-up instructions, shutdown instructions, fault clearing instructions, reset instructions, system working modes, module enabling states and SRC-DACH and SRC-DABL synchronous pulse signals.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310521639.3A CN116488431A (en) | 2023-05-10 | 2023-05-10 | Control system applied to power electronic transformer |
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| CN202310521639.3A CN116488431A (en) | 2023-05-10 | 2023-05-10 | Control system applied to power electronic transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117526683A (en) * | 2024-01-03 | 2024-02-06 | 湖南北顺源智能科技有限公司 | High-voltage direct-current converter system and synchronous start-stop fault processing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117526683A (en) * | 2024-01-03 | 2024-02-06 | 湖南北顺源智能科技有限公司 | High-voltage direct-current converter system and synchronous start-stop fault processing method |
| CN117526683B (en) * | 2024-01-03 | 2024-03-29 | 湖南北顺源智能科技有限公司 | High-voltage direct-current converter system and synchronous start-stop fault processing method |
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