CN110943634A - Energy type router and soft charging control method and system thereof - Google Patents
Energy type router and soft charging control method and system thereof Download PDFInfo
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- CN110943634A CN110943634A CN201811121322.6A CN201811121322A CN110943634A CN 110943634 A CN110943634 A CN 110943634A CN 201811121322 A CN201811121322 A CN 201811121322A CN 110943634 A CN110943634 A CN 110943634A
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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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
- H02M1/36—Means for starting or stopping 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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
An energy type router and a soft charging control method and system thereof comprise: the system comprises a plurality of three-phase modular multilevel converters and DAB sub-modules with the same number as the three-phase modular multilevel converters; the three-phase modular multilevel converter and the DAB sub-module are connected in parallel to form a module group; the module group is connected to the high-voltage alternating current side of the power grid; the three-phase modularization multi-level transverter with the DAB submodule piece includes respectively: a capacitor; and charging the capacitor of the three-phase modular multilevel converter and the capacitor of the DAB sub-module based on the comparison result of the capacitor voltage of the three-phase modular multilevel converter and a preset voltage threshold value and a target value. The alternating current sub-module capacitor can be charged quickly and stably, an additional circuit is not needed for charging the direct current DAB module, the cost is saved, the smooth starting of the voltage of the output side is realized, and the overall efficiency and stability of the soft charging of the energy router system are further improved.
Description
Technical Field
The invention relates to the field of electric power, in particular to an energy type router and a soft charging control method and system thereof.
Background
With the rapid development of economic society, the demand of people for electric energy is increasing, the traditional fossil fuel power generation has a crisis, the renewable energy power generation represented by solar energy and wind energy is widely applied in various countries in the world, and the renewable energy power generation is distributed energy with a long distance, so that how to conveniently utilize the energy and realize efficient electric energy transmission becomes a big problem in the current power industry. The intelligent micro-grid and flexible direct current transmission technology are developed to solve the problems, the intelligent micro-grid is a small power generation and distribution system taking a power electronic technology as a core, and is a novel power grid with high integration of a renewable energy power generation technology, an energy management system and power transmission and distribution infrastructure, flexible direct current transmission is important equipment for constructing the intelligent power grid, compared with the traditional mode, the flexible direct current transmission has stronger technical advantages in aspects of island power supply, capacity increasing transformation of an urban power distribution network, alternating current system interconnection, large-scale wind power plant grid connection and the like, and is a strategic choice for changing the development pattern of a large power grid.
When a large number of sub-module capacitors distributed in positions in a system need to be charged to rated voltage in the current modular multilevel topology technology, the charging efficiency is low, overvoltage and voltage distortion can be generated, and alternating current and the sub-module capacitors cannot be charged quickly and stably.
Disclosure of Invention
The invention provides an energy type router and a soft charging control method and system thereof, and aims to solve the problems that a large number of sub-module capacitors distributed in positions in the system cannot be charged to a rated voltage quickly, cannot generate stable direct current bus voltage to charge a subsequent module, and generates overvoltage and voltage distortion.
The technical scheme provided by the invention is as follows:
an energy-based router, the energy-based router comprising: the system comprises a plurality of three-phase modular multilevel converters and DAB sub-modules with the same number as the three-phase modular multilevel converters;
the three-phase modular multilevel converter and the DAB sub-module are connected in parallel to form a module group; the module group is connected to the high-voltage alternating current side of the power grid;
the three-phase modularization multi-level transverter with the DAB submodule piece includes respectively: a capacitor;
and the energy type router charges the capacitor of the three-phase modular multilevel converter and the capacitor of the DAB submodule based on a comparison result of the capacitor voltage of the three-phase modular multilevel converter and a preset voltage threshold value and a target value.
Preferably, the three-phase modular multilevel converter further comprises: the upper bridge arm IGBT tube and the lower bridge arm IGBT tube; the IGBT tube of the lower bridge arm is connected to the high-voltage alternating current side of the power grid;
and after the emitting electrode of the upper bridge arm IGBT tube is connected with the collecting electrode of the lower bridge arm IGBT tube in series, the emitting electrode of the upper bridge arm IGBT tube is connected with the capacitor of the three-phase modular multilevel converter in parallel to form a capacitor direct-current output end.
Preferably, the DAB sub-module further comprises: a primary side H bridge, a secondary side H bridge and an intermediate frequency transformer;
one end of the primary side H bridge is connected with the primary side of the intermediate frequency transformer, and the other end of the primary side H bridge is connected with a capacitor of the three-phase modular multilevel converter;
one end of the secondary side H bridge is connected with the secondary side of the intermediate frequency transformer, and the other end of the secondary side H bridge is connected with the secondary side H bridges in other DAB sub-modules in parallel.
Preferably, the method further comprises the following steps: a current limiting resistor, a switch and an inverter;
the current limiting resistor is connected with the switch in parallel and then connected with the alternating current side of the three-phase modular multilevel converter;
the inverter is connected with the module group;
the inverter is used for acquiring three-phase voltage and three-phase current at the alternating current side;
the current limiting resistor is used for limiting the impact current of the alternating current side of the three-phase modular multilevel converter.
Preferably, the inverter includes: an IGBT tube and a diode;
each IGBT tube is connected with a diode in parallel in an opposite direction;
two diodes are connected in series to form a bridge arm;
the four bridge arms are connected in parallel to form the inverter.
A method of soft charge control of an energy-based router, the method comprising:
acquiring capacitor voltage of a three-phase modular multilevel converter;
when the voltage of the capacitor of the three-phase modular multilevel converter is smaller than a target voltage value, the capacitor of the three-phase modular multilevel converter is charged based on the alternating voltage and a system enabling signal until the target voltage value is reached;
and the three-phase modular multilevel converter capacitor charges the DAB submodule capacitor.
Preferably, when the voltage of the capacitor of the three-phase modular multilevel converter is smaller than the target voltage value, the charging of the capacitor of the three-phase modular multilevel converter based on the ac voltage and the system enable signal until the target voltage value is reached includes:
when the acquired capacitor voltage of the three-phase modular multilevel converter is smaller than a preset voltage threshold, charging the capacitor of the three-phase modular multilevel converter through an anti-parallel diode of an IGBT (insulated gate bipolar transistor) tube based on alternating current voltage until the preset voltage threshold is reached;
and after the voltage of the capacitor of the three-phase modular multilevel converter reaches a preset voltage threshold value, charging the capacitor of the three-phase modular multilevel converter through a generated system enabling signal until the voltage of the capacitor of the three-phase modular multilevel converter reaches the target voltage value.
Preferably, after the voltage of the three-phase modular multilevel converter capacitor reaches a preset voltage threshold, the three-phase modular multilevel converter capacitor is charged by the generated system enable signal, and the method further includes:
acquiring three-phase voltage at an alternating current side, three-phase current at the alternating current side, capacitor voltage of a three-phase modular multilevel converter and initial voltage;
processing the difference value between the capacitor voltage of the three-phase modular multilevel converter and the initial voltage to obtain an instruction current;
the alternating-current side three-phase current is converted to obtain converted current;
and obtaining a three-phase command voltage value through proportional resonance adjustment and conversion based on the difference value of the command current and the conversion current.
Preferably, after the voltage of the three-phase modular multilevel converter capacitor reaches a preset voltage threshold, the charging of the three-phase modular multilevel converter capacitor through the generated system enable signal includes:
determining a charging control command based on the three-phase command voltage value and the generated system enable signal;
and charging the three-phase modular multilevel converter capacitor based on the charging control instruction.
Preferably, the three-phase modularization multi-level transverter electric capacity charges for DAB submodule piece electric capacity, includes:
based on three-phase modularization multi-level transverter capacitor voltage, through the phase shift control DAB submodule piece electric capacity primary side H bridge phase shift angle makes three-phase modularization multi-level transverter electric capacity is as the input, for DAB submodule piece electric capacity charges, until the phase shift angle reaches and predetermines the angle.
A soft charge control system for an energy based router, the system comprising:
an acquisition module: the method comprises the steps of obtaining capacitor voltage of the three-phase modular multilevel converter;
a first charging module: the charging circuit is used for charging the capacitor of the three-phase modular multilevel converter based on the alternating-current voltage when the voltage of the capacitor of the three-phase modular multilevel converter is smaller than a preset voltage threshold value until a target voltage value is reached;
a second charging module: and the capacitor of the three-phase modular multilevel converter is used for charging the capacitor of the DAB submodule.
Preferably, the first charging module includes: a first charging unit and a second charging unit;
the first charging unit is used for charging the capacitor of the three-phase modular multilevel converter through a diode connected with an IGBT tube in an anti-parallel mode based on alternating voltage when the acquired capacitor voltage of the three-phase modular multilevel converter is smaller than a preset voltage threshold value;
the second charging unit is used for charging the three-phase modular multilevel converter capacitor through an enabling signal based on the charged three-phase modular multilevel converter capacitor voltage until the three-phase modular multilevel converter capacitor voltage reaches the voltage threshold.
Compared with the prior art, the invention has the following beneficial effects:
1. an energy type router, a soft charging control method and a soft charging control system thereof are disclosed, wherein the capacitor voltage of a three-phase modular multilevel converter is obtained; when the voltage of the capacitor of the three-phase modular multilevel converter is smaller than a target voltage value, the capacitor of the three-phase modular multilevel converter is charged based on the alternating voltage and a system enabling signal until the target voltage value is reached; the three-phase modular multilevel converter capacitor is used for charging the DAB sub-module capacitor, a large number of sub-module capacitors distributed in the system can be rapidly charged to a target voltage value, and then stable direct-current bus voltage is generated to charge subsequent modules, so that overvoltage and voltage distortion are avoided.
2. An energy type router, a soft charging control method and a soft charging control system thereof realize the quick and stable charging of an AC level sub-module capacitor, the charging of a DC level DAB module does not need an additional circuit, the smooth starting of the voltage of an output side is realized, and the overall soft charging efficiency of the system is greatly improved.
Drawings
Fig. 1 is a schematic diagram of the overall structure of an MMC energy router;
FIG. 2 is a flow chart of an AC stage closed loop pre-charge method;
FIG. 3 is a flow chart of a DC stage closed loop pre-charge method.
Detailed Description
For a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples.
Example 1:
an energy router, as shown in fig. 1, comprising: the system comprises a plurality of three-phase modular multilevel converters and DAB sub-modules with the same number as the three-phase modular multilevel converters;
the three-phase modular multilevel converter and the DAB sub-module are connected in parallel to form a module group; the module group is connected to the high-voltage alternating current side of the power grid;
the three-phase modularization multi-level transverter with the DAB submodule piece includes respectively: a capacitor;
and charging the capacitor of the three-phase modular multilevel converter and the capacitor of the DAB sub-module based on the comparison result of the capacitor voltage of the three-phase modular multilevel converter and a preset voltage threshold value and a target value.
The three-phase modular multilevel converter further comprises: the upper bridge arm IGBT tube and the lower bridge arm IGBT tube; the lower bridge arm is connected to the high-voltage alternating current side of the power grid;
and the emitting electrode of the upper bridge arm IGBT tube is connected with the collecting electrode of the lower bridge arm IGBT tube in series and then connected with the capacitor in parallel to form a capacitor direct current output end.
The DAB submodule includes: a primary side H bridge, a secondary side H bridge and an intermediate frequency transformer;
one end of the primary side H bridge is connected with the primary side of the intermediate frequency transformer, and the other end of the primary side H bridge is connected with a capacitor of the three-phase modular multilevel converter;
one end of the secondary side H bridge is connected with the secondary side of the intermediate frequency transformer, and the other end of the secondary side H bridge is connected with the secondary side H bridges in other DAB sub-modules in parallel.
The current limiting resistor is connected with the switch in parallel and then connected with the alternating current side of the three-phase modular multilevel converter;
the inverter is connected with the module group;
the inverter is used for acquiring three-phase voltage and three-phase current at the alternating current side;
the current limiting resistor is used for limiting the impact current of the alternating current side of the three-phase modular multilevel converter.
Each IGBT tube is connected with a diode in parallel in an opposite direction;
two IGBT tubes are reversely connected in parallel and a diode is connected in series to form a bridge arm;
the four bridge arms are connected in parallel to form the inverter.
The specific link structure of the energy type router is specifically as follows: the system comprises a three-phase modular multilevel converter, a multi-DAB output parallel system and an inverter; each phase of the three-phase modular multilevel converter comprises an upper bridge arm and a lower bridge arm, each bridge arm is formed by connecting n sub-modules in series, each sub-module is of a half-bridge structure, the multi-DAB output parallel system comprises DAB modules with the number equal to that of MMC sub-modules (of the three-phase modular multilevel converter), the output-stage inverter is a traditional three-phase four-wire inverter, and the input end of the output-stage inverter is connected with a low-voltage direct-current port of the system; the soft charging control strategy comprises an MMC alternating-current level closed-loop pre-charging control strategy and a multi-DAB parallel system direct-current level pre-charging control strategy;
each half-bridge submodule of the MMC comprises two IGBT tubes, each IGBT tube is connected with a diode in parallel in a reverse direction, and an emitting electrode of the upper side IGBT tube is connected with a collecting electrode of the lower side IGBT tube; the two IGBT tubes are connected with the capacitor in parallel to form a direct current output end;
the DAB module comprises two groups of H bridges and an intermediate frequency transformer, and alternating current ends of the two groups of H bridges are respectively connected with an original secondary side of the intermediate frequency transformer; the direct current side of the H bridge positioned at one end of the primary side is connected with the direct current output end of the MMC sub-module capacitor, and the direct current side of the H bridge positioned at one end of the secondary side is connected with other DAB ports in parallel to form direct current output;
the three-phase four-wire system inverter consists of four bridge arms, wherein each bridge arm is provided with two IGBT tubes which are respectively connected with a diode in parallel in a reverse direction;
example 2:
a soft charging control method of an energy router, a soft charging control method of an MMC type energy router, comprises the following steps:
the method comprises the following steps: acquiring capacitor voltage of a three-phase modular multilevel converter;
step two: when the voltage of the capacitor of the three-phase modular multilevel converter is smaller than a target voltage value, the capacitor of the three-phase modular multilevel converter is charged based on the alternating voltage and a system enabling signal until the target voltage value is reached;
step three: the three-phase modular multilevel converter capacitor charges a DAB sub-module capacitor;
the method comprises the following steps: acquiring capacitor voltage of a three-phase modular multilevel converter;
the pre-charging process of the system is mainly divided into an MMC uncontrollable charging process, an MMC controllable charging process and a direct-current-level controllable charging process, and the system firstly carries out an alternating-current-level MMC uncontrollable charging process. When the MMC sub-module is in a locking state, the voltage of each sub-module is zero, all IGBTs are in a turn-off state, at the moment, the current at the alternating current side can only carry out uncontrollable charging on a capacitor through anti-parallel diodes in the sub-modules, in order to limit the influence of the impact current when the charging process starts on the circuit, the structure shown in figure 1 can be adopted, a current-limiting resistor is introduced at the alternating current side to limit the impact current, and the size of the resistor is selected according to the current-resistant level of a power device.
In an uncontrollable charging stage, the topological structure of the sub-modules determines that a charging power supply provided by the alternating current system can charge the sub-modules, and the capacitors of the sub-modules cannot be discharged, the working characteristic enables the system to establish certain capacitor voltage through uncontrollable pre-charging so as to facilitate the subsequent charging process, but the capacitor voltage at the moment cannot reach the working voltage required by the stable operation of the converter, and the controllable charging is still carried out by utilizing the control units of the sub-modules so as to further improve the capacitor voltage of the sub-modules.
Step two: when the voltage of the capacitor of the three-phase modular multilevel converter is smaller than a target voltage value, the capacitor of the three-phase modular multilevel converter is charged based on the alternating voltage and a system enabling signal until the target voltage value is reached;
as shown in fig. 2, wherein: u. ofr1The voltage, u, reached by the sub-module capacitor during the uncontrolled charging of the resistorr2To a closed loop starting voltage, ur3And the target direct current voltage value of the submodule is obtained. Data acquisition system real-time detection submodule capacitor voltage udcThe system will give a closed loop voltage starting value ur2Will udcAnd ur2Performing difference operation to obtain voltage deviation, and inputting the voltage deviation into the proportional-integral regulator PI to obtain the active value of the instruction current
Data acquisition system detects three-phase input current iA,B,CAnd performing abc/αβ transformation on the obtained signal to obtain iα、iβ；
Will command the current to have a working value
The instruction current under a two-phase static coordinate system is obtained by carrying out dq/αβ coordinate transformation as input
And
and respectively connected with the previous three-phase current iA,B,CI obtained by performing abc/αβ transformationαAnd iβPerforming difference operation to obtain corresponding currentDeviation, then feeding the current deviation into the proportional resonant regulator PR to obtain a voltage value uαAnd uβ；
Will uαAnd uβPerforming αβ/abc coordinate transformation as input to obtain three-phase voltage command values, and detecting u in real timedcIs greater than the voltage threshold u reached during the uncontrolled charging phaser1When the system is used, the system can generate an enabling signal, and the enabling signal and the circulating current suppression control and the direct current voltage balance control of the system act together to generate pulse generation signals of each module of the MMC;
after the pulse signal is generated and applied to each submodule, the initial value u of the closed-loop voltager2Slowly rising under the control of the controller, and repeating the closed-loop charging process until ur2Smoothly rises to the submodule target direct-current voltage value ur3And the system is stable, and the MMC can control the charging process to be finished.
Step three: and the three-phase modular multilevel converter capacitor charges the DAB submodule capacitor.
The DAB submodule is formed by connecting two groups of H-bridge alternating current ends with the primary side and the secondary side of the intermediate frequency transformer respectively, one end of the DAB submodule is connected with the MMC submodule capacitor direct current output end, and the other end of the DAB submodule is connected with other DAB ports in the same phase to form direct current output;
after MMC controllable charging is completed, the system performs pre-charging on a multi-DAB parallel output system, FIG. 3 shows direct-current-level closed-loop pre-charging control, namely a pre-charging control method for gradually increasing a primary side H bridge phase shift angle, the basic idea of the control is to gradually increase the primary side phase shift angle of an H bridge to enable the input power to be gradually increased from zero, power is transmitted from the primary side to a secondary side through traditional phase shift control, the voltage at the output side is slowly charged, and therefore current overshoot in the circuit is reduced, and capacitor voltage oscillation is prevented;
as shown in figure 3 of the drawings,
the phase shift angle of a primary side bridge arm of an H bridge of a DAB system is zero at an initial value and is slowly increased
The value of (1) is used as input to the phase shift modulation, the bridge arm IGBTs on the secondary side of the H bridge are all in a locked state, which is equivalent to an uncontrolled rectifier bridge, and the current charges the output side capacitor through the anti-parallel diode of the switch;
the phase shift control slowly increases the phase shift angle of the left bridge arm of the primary H bridge, so that the capacitor voltage of the preceding MMC submodule is slowly increased from zero as input, DAB sends the current generated by the primary side to the secondary side through the intermediate frequency transformer, and the current slowly charges the capacitor at the output side through the anti-parallel diode of the switch. Repeating the above control process when the phase shift angle is larger
When the voltage reaches 50%, the charging process is finished, and the capacitor on the DAB output side can obtain stable direct-current voltage.
Example 3:
based on the same concept, the invention also provides a soft charging control system of the energy type router, and the system comprises:
an acquisition module: the method comprises the steps of obtaining capacitor voltage of the three-phase modular multilevel converter;
a first charging module: the charging circuit is used for charging the capacitor of the three-phase modular multilevel converter based on the alternating-current voltage when the voltage of the capacitor of the three-phase modular multilevel converter is smaller than a preset voltage threshold value until the preset voltage threshold value is reached;
a second charging module: and the capacitor of the three-phase modular multilevel converter is used for charging the capacitor of the DAB submodule.
The first charging module includes: a first charging unit and a second charging unit;
the first charging unit is used for charging the capacitor of the three-phase modular multilevel converter through a diode connected with an IGBT tube in an anti-parallel mode based on alternating voltage when the acquired capacitor voltage of the three-phase modular multilevel converter is smaller than a preset voltage threshold value;
the second charging unit is used for charging the three-phase modular multilevel converter capacitor through an enabling signal based on the charged three-phase modular multilevel converter capacitor voltage until the three-phase modular multilevel converter capacitor voltage reaches the voltage threshold.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (12)
1. An energy-based router, the energy-based router comprising: the system comprises a plurality of three-phase modular multilevel converters and DAB sub-modules with the same number as the three-phase modular multilevel converters;
the three-phase modular multilevel converter and the DAB sub-module are connected in parallel to form a module group; the module group is connected to the high-voltage alternating current side of the power grid;
the three-phase modularization multi-level transverter with the DAB submodule piece includes respectively: a capacitor;
and the energy type router charges the capacitor of the three-phase modular multilevel converter and the capacitor of the DAB submodule based on a comparison result of the capacitor voltage of the three-phase modular multilevel converter and a preset voltage threshold value and a target value.
2. An energy router according to claim 1 wherein the three phase modular multilevel converter further comprises: the upper bridge arm IGBT tube and the lower bridge arm IGBT tube; the IGBT tube of the lower bridge arm is connected to the high-voltage alternating current side of the power grid;
and after the emitting electrode of the upper bridge arm IGBT tube is connected with the collecting electrode of the lower bridge arm IGBT tube in series, the emitting electrode of the upper bridge arm IGBT tube is connected with the capacitor of the three-phase modular multilevel converter in parallel to form a capacitor direct-current output end.
3. An energy router according to claim 1 wherein the DAB sub-module further comprises: a primary side H bridge, a secondary side H bridge and an intermediate frequency transformer;
one end of the primary side H bridge is connected with the primary side of the intermediate frequency transformer, and the other end of the primary side H bridge is connected with a capacitor of the three-phase modular multilevel converter;
one end of the secondary side H bridge is connected with the secondary side of the intermediate frequency transformer, and the other end of the secondary side H bridge is connected with the secondary side H bridges in other DAB sub-modules in parallel.
4. An energy router according to claim 1, further comprising: a current limiting resistor, a switch and an inverter;
the current limiting resistor is connected with the switch in parallel and then connected with the alternating current side of the three-phase modular multilevel converter;
the inverter is connected with the module group;
the inverter is used for acquiring three-phase voltage and three-phase current at the alternating current side;
the current limiting resistor is used for limiting the impact current of the alternating current side of the three-phase modular multilevel converter.
5. An energy router according to claim 4 wherein the inverter comprises: an IGBT tube and a diode;
each IGBT tube is connected with a diode in parallel in the reverse direction to form a module;
two modules are connected in series to form a bridge arm;
the four bridge arms are connected in parallel to form the inverter.
6. A method for controlling soft charging of an energy router, the method comprising:
acquiring capacitor voltage of a three-phase modular multilevel converter;
when the voltage of the capacitor of the three-phase modular multilevel converter is smaller than a target voltage value, the capacitor of the three-phase modular multilevel converter is charged based on the alternating voltage and a system enabling signal until the target voltage value is reached;
and the three-phase modular multilevel converter capacitor charges the DAB submodule capacitor.
7. The method of claim 6, wherein the step of charging the three-phase modular multilevel converter capacitor based on the ac voltage and the system enable signal until the target voltage value is reached comprises the step of:
when the acquired capacitor voltage of the three-phase modular multilevel converter is smaller than a preset voltage threshold, charging the capacitor of the three-phase modular multilevel converter through an anti-parallel diode of an IGBT (insulated gate bipolar transistor) tube based on alternating current voltage until the preset voltage threshold is reached;
and after the voltage of the capacitor of the three-phase modular multilevel converter reaches a preset voltage threshold value, charging the capacitor of the three-phase modular multilevel converter through a generated system enabling signal until the voltage of the capacitor of the three-phase modular multilevel converter reaches the target voltage value.
8. The method of claim 7, wherein the step of charging the three-phase modular multilevel converter capacitor with the generated system enable signal after the voltage of the three-phase modular multilevel converter capacitor reaches a preset voltage threshold further comprises:
acquiring three-phase voltage at an alternating current side, three-phase current at the alternating current side, capacitor voltage of a three-phase modular multilevel converter and initial voltage;
processing the difference value between the capacitor voltage of the three-phase modular multilevel converter and the initial voltage to obtain an instruction current;
the alternating-current side three-phase current is converted to obtain converted current;
and obtaining a three-phase command voltage value through proportional resonance adjustment and conversion based on the difference value of the command current and the conversion current.
9. The method of claim 8, wherein the step of charging the three-phase modular multilevel converter capacitor with the generated system enable signal after the voltage of the three-phase modular multilevel converter capacitor reaches a preset voltage threshold comprises:
determining a charging control command based on the three-phase command voltage value and the generated system enable signal;
and charging the three-phase modular multilevel converter capacitor based on the charging control instruction.
10. The method as claimed in claim 6, wherein the step of charging the capacitor of the three-phase modular multilevel converter for the capacitor of the DAB sub-module comprises:
based on three-phase modularization multi-level transverter capacitor voltage, through the phase shift control DAB submodule piece electric capacity primary side H bridge phase shift angle makes three-phase modularization multi-level transverter electric capacity is as the input, for DAB submodule piece electric capacity charges, until the phase shift angle reaches and predetermines the angle.
11. A soft charge control system for an energy based router, the system comprising:
an acquisition module: the method comprises the steps of obtaining capacitor voltage of the three-phase modular multilevel converter;
a first charging module: the charging circuit is used for charging the capacitor of the three-phase modular multilevel converter based on the alternating-current voltage when the voltage of the capacitor of the three-phase modular multilevel converter is smaller than a preset voltage threshold value until the preset voltage threshold value is reached;
a second charging module: and the capacitor of the three-phase modular multilevel converter is used for charging the capacitor of the DAB submodule.
12. The energy router soft charge control system of claim 11, wherein the first charging module comprises: a first charging unit and a second charging unit;
the first charging unit is used for charging the capacitor of the three-phase modular multilevel converter through a diode connected with an IGBT tube in an anti-parallel mode based on alternating voltage when the acquired capacitor voltage of the three-phase modular multilevel converter is smaller than a preset voltage threshold value;
the second charging unit is used for charging the three-phase modular multilevel converter capacitor through an enabling signal based on the charged three-phase modular multilevel converter capacitor voltage until the three-phase modular multilevel converter capacitor voltage reaches the voltage threshold.
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