CN116667345B - Charging control method and device for serial-parallel type multi-port flexible interconnection equipment - Google Patents
Charging control method and device for serial-parallel type multi-port flexible interconnection equipment Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
- H02J3/00125—Transmission line or load transient problems, e.g. overvoltage, resonance or self-excitation of inductive loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Selective Calling Equipment (AREA)
Abstract
The utility model discloses a charging control method and device of serial-parallel type multiport flexible interconnection equipment, which relates to the technical field of flexible interconnection, and the scheme provided by the application is used for optimizing the pre-charging procedure when the serial-parallel type multiport flexible interconnection equipment is started, and when the pre-charging is performed to the final stage, the voltage parameters of all power sub-modules in a device are compared, and the power sub-modules are cut off in batches according to the voltage levels of all the power sub-modules, so that the voltage of all the power sub-modules is smoothly charged to rated voltage step by step, thereby reducing the pre-charging voltage and actual set voltage deviation, achieving the effect of weakening impact current, and guaranteeing the normal operation of all devices in the equipment.
Description
Technical Field
The application relates to the technical field of flexible interconnection, in particular to a charging control method and device for serial-parallel multi-port flexible interconnection equipment.
Background
The distributed energy permeability is improved, the electric automobile is popularized in a large range, and the user load is diversified, so that the problems of voltage out-of-limit, feeder overload, bidirectional tide and the like are brought to the power distribution network. The flexible interconnection switch is utilized to replace the traditional interconnection switch, so that the flexible regulation and control capability of the power distribution network can be effectively enhanced. In addition, under the development trend of multi-meshed distribution networks, the demand for low-cost and easily-expanded multi-feeder flexible interconnection technology is increasing. Under the technical environment, the flexible interconnection technology of the series-parallel multi-port power distribution network is provided, has the advantages of being capable of realizing active power flow regulation and control among a plurality of interconnection feed lines and reactive power decoupling support, low in cost, capable of realizing power sub-modularity, flexibly expanding ports and the like, and is gradually widely applied. However, in daily applications, the conventional flexible interconnection device often generates a large impact current after being precharged, which affects the service life of the device.
Disclosure of Invention
The application provides a charging control method and device of serial-parallel type multi-port flexible interconnection equipment, which are used for solving the technical problem that the service life of a device is influenced due to the fact that large impact current is often generated after the conventional flexible interconnection equipment is precharged.
In order to solve the above technical problems, a first aspect of the present application provides a charging control method for a serial-parallel multi-port flexible interconnection device, including:
when the multi-port flexible interconnection equipment is started, a feeder switch of the multi-port flexible interconnection equipment is controlled, so that the multi-port flexible interconnection equipment is connected with only one feeder, and all devices in the multi-port flexible interconnection equipment are locked, so that the feeder charges all power sub-modules in the multi-port flexible interconnection equipment;
and monitoring the voltage of each power sub-module of the multi-port flexible interconnection equipment, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, determining a plurality of power sub-modules with the highest voltage in each phase, cutting off the determined power sub-modules, and after the power sub-modules are cut off and a preset interval time is passed, re-determining the plurality of power sub-modules with the highest voltage in each phase, cutting off the determined power sub-modules until the voltage parameters of each power sub-module remained after the power sub-modules are cut off reach a preset module voltage rated value.
Preferably, the monitoring the voltage of each power sub-module of the multi-port flexible interconnection device, after the voltage of each power sub-module is charged to a stable state, comparing the voltage parameters of each power sub-module, determining a plurality of power sub-modules with highest voltages in each phase, so as to cut off the determined power sub-modules, and after the power sub-modules are cut off and a preset interval time passes, re-determining the plurality of power sub-modules with highest voltages in each phase, and cutting off the determined power sub-modules specifically includes:
monitoring the voltage of each power sub-module of the multi-port flexible interconnection equipment, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, and determining a plurality of power sub-modules with the highest voltages in each phase by combining the initial cutting number so as to cut off the determined power sub-modules;
after the power sub-modules are cut off and a preset interval time passes, the cutting-off number is increased, so that the plurality of power sub-modules with the highest voltage in each phase are redetermined by combining the updated cutting-off number, and then the determined power sub-modules are cut off, wherein the cutting-off number does not exceed a module number threshold.
Preferably, the calculation formula of the module number threshold is:
；
wherein Vz represents the phase voltage between any two phases, vn is the rated voltage of the power sub-module, and X1 is the module number threshold.
Preferably, the determining the power sub-modules with the highest voltages in each phase further comprises:
when the power sub-module is a power sub-module in the PFCM and the PBCM, updating the determined power sub-module to ensure that the number of modules cut off by upper and lower bridge arms in each corresponding PFCM and PBCM in the three phases is kept consistent;
when the power sub-module is a power sub-module in the SVG, updating the determined power sub-module to ensure that the number of modules cut off by each corresponding SVG in the three phases is kept consistent.
Preferably, the charging the power sub-modules in the multi-port flexible interconnection device by the feeder specifically includes:
and the feeder line carries out uncontrolled charging on each power sub-module in the multi-port flexible interconnection equipment through the soft start resistor, and after the soft start resistor charges the voltage of each power sub-module to a stable state, the soft start resistor is cut off to continue charging until the voltage of each power sub-module is charged to the stable state again.
Meanwhile, a second aspect of the present application provides a start control device for a serial-parallel multi-port flexible interconnection device, including:
the first charging control unit is used for controlling a feeder switch of the multi-port flexible interconnection equipment when the multi-port flexible interconnection equipment is started, so that the multi-port flexible interconnection equipment is connected with only one feeder, and all devices in the multi-port flexible interconnection equipment are locked, so that the feeder charges all power sub-modules in the multi-port flexible interconnection equipment;
the second charging control unit is used for monitoring the voltage of each power sub-module of the multi-port flexible interconnection device, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, determining a plurality of power sub-modules with the highest voltage in each phase, cutting off the determined power sub-modules, after the power sub-modules are cut off and a preset interval time is passed, re-determining the plurality of power sub-modules with the highest voltage in each phase, cutting off the determined power sub-modules until the voltage parameters of each power sub-module remained after the power sub-modules are cut off reach a preset module voltage rated value.
Preferably, the second charging control unit is specifically configured to:
monitoring the voltage of each power sub-module of the multi-port flexible interconnection equipment, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, and determining a plurality of power sub-modules with the highest voltages in each phase by combining the initial cutting number so as to cut off the determined power sub-modules;
after the power sub-modules are cut off and a preset interval time passes, the cutting-off number is increased, so that the plurality of power sub-modules with the highest voltage in each phase are redetermined by combining the updated cutting-off number, and then the determined power sub-modules are cut off, wherein the cutting-off number does not exceed a module number threshold.
Preferably, the determining the power sub-modules with the highest voltages in each phase further comprises:
the cutting module adjusting unit is used for updating the determined power sub-module when the power sub-module is the power sub-module in the PFCM and the PBCM, so that the number of the upper bridge arm and the lower bridge arm cut-off modules in each corresponding PFCM and PBCM in the three phases is kept consistent; or; when the power sub-module is a power sub-module in the SVG, updating the determined power sub-module to ensure that the number of modules cut off by each corresponding SVG in the three phases is kept consistent.
Preferably, the first charging control unit is specifically configured to:
when the multi-port flexible interconnection equipment is started, a feeder switch of the multi-port flexible interconnection equipment is controlled, so that the multi-port flexible interconnection equipment is connected with only one feeder, all devices in the multi-port flexible interconnection equipment are blocked, the feeder is used for carrying out uncontrolled charging on each power sub-module in the multi-port flexible interconnection equipment through a soft start resistor, and after the soft start resistor charges the voltage of each power sub-module to a stable state, the soft start resistor is cut off to continue charging until the voltage of each power sub-module is charged to the stable state again.
From the above technical scheme, the application has the following advantages:
according to the scheme, the precharge procedure is optimized when the serial-parallel type multi-port power distribution network flexible interconnection equipment is started, when the precharge is carried out to the final stage, the voltage parameters of all power sub-modules in the device are compared, the power sub-modules are cut off in batches according to the voltage levels of all the power sub-modules, and the voltage of all the power sub-modules is charged to the rated voltage in a smooth mode step by step, so that the deviation between the precharge voltage and the actual set voltage is reduced, the effect of weakening the impact current is achieved, and the normal operation of all devices in the equipment is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a main loop structure of a flexible interconnection device for a serial-parallel multi-port power distribution network according to the present application.
Fig. 2 is a schematic diagram of a power submodule structure of a flexible interconnection device of a serial-parallel multi-port power distribution network.
Fig. 3 is an equivalent circuit diagram of a main loop structure of the serial-parallel multi-port power distribution network flexible interconnection device according to the present application when only one feeder line is connected.
Fig. 4 is a diagram of a two-phase equivalent circuit of a flexible interconnection device AB of a series-parallel multi-port power distribution network.
Fig. 5 is a schematic flow chart of an embodiment of a charge control method of a serial-parallel multi-port flexible interconnection device provided in the present application.
Fig. 6 is a schematic flow chart of an uncontrolled charging phase in a serial-parallel multi-port flexible interconnection device provided in the present application.
Fig. 7 is a schematic flow chart of a controllable charging stage in a serial-parallel multi-port flexible interconnection device provided by the present application.
Fig. 8 is a schematic flow chart of a power submodule adjustment procedure in a controllable charging stage in a serial-parallel multi-port flexible interconnection device provided by the present application.
Fig. 9 is a schematic structural diagram of an embodiment of a charge control device of a serial-parallel multi-port flexible interconnection apparatus provided in the present application.
Detailed Description
Aiming at the current situation that the prior flexible interconnection equipment often generates larger impact current after being precharged and influences the service life of devices, the applicant finds that the reason for the phenomenon is as follows: the traditional flexible interconnection equipment is started in a mode that after the starting resistor is subjected to pre-charging, unlocking control is directly performed, the voltage of the pre-charging is smaller than the set voltage deviation, and the charging current is smaller.
Aiming at the research, the embodiment of the application provides a charging control method and device of serial-parallel multi-port flexible interconnection equipment, which are used for solving the technical problem that the prior flexible interconnection equipment often generates larger impact current after being precharged, and the service life of a device is influenced.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Fig. 1 shows a main loop structure of a flexible interconnection device for a serial-parallel multi-port power distribution network, which is related to the invention, and there are 3 10kV ac feeder lines in the figure, wherein S1 and S2 are contactors of feeder line 1, S3 and S4 are contactors of feeder line 2, and S5 and S6 are contactors of feeder line 3. Wherein R1 is a soft start resistor, FBSM is a power sub-module with a full bridge structure, the sub-modules on each phase are connected in series, the sub-module structure is shown in figure 2, figure 3 shows an equivalent circuit structure of any feeder line, figure 4 shows an equivalent circuit diagram of two phases in a main loop by taking AB phase as an example,
the method is mainly applied to the charging control of the flexible interconnection equipment of the serial-parallel type multi-port power distribution network in a pre-charging stage during starting so as to achieve the purpose that the voltage of power sub-modules of all modules in the flexible interconnection equipment is stably charged to a rated voltage value and large impulse current is not generated, wherein the voltage of the power sub-modules can be represented by the voltage of a capacitor contained in the power sub-modules.
Referring to fig. 5, a charging control method for a serial-parallel multi-port flexible interconnection device provided in an embodiment of the present application includes:
step 101, when multi-port flexible interconnection equipment is started, a feeder switch of the multi-port flexible interconnection equipment is controlled, so that the multi-port flexible interconnection equipment is only connected into one feeder, and all devices in the multi-port flexible interconnection equipment are locked, so that the feeder charges all power sub-modules in the multi-port flexible interconnection equipment;
step 102, monitoring the voltage of each power sub-module of the multi-port flexible interconnection device, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, determining a plurality of power sub-modules with the highest voltage in each phase, cutting off the determined power sub-modules, and after the power sub-modules are cut off and a preset interval time is passed, re-determining the plurality of power sub-modules with the highest voltage in each phase, cutting off the determined power sub-modules until the voltage parameters of each remaining power sub-module reach a preset module voltage rated value when the power sub-modules are cut off.
Before starting, all contactors are in an open state, no alternating current feeder is connected to the device, when the equipment is started, any feeder is connected to the system, the feeder 1 can be generally defaulted, the contactor S1 corresponding to the feeder 1 is closed, the rest contactors are kept in the open state, the power sub-module in the equipment is subjected to uncontrolled charging until the charging voltage is basically stable, after the voltage of the power sub-module is stable, the uncontrolled charging is finished, after the uncontrolled charging is finished, the voltage of the power sub-module cannot reach the rated voltage value of the sub-module, and a controllable charging stage is required.
In the controllable charging stage, the voltages in the modules are sequenced and compared, a plurality of power sub-modules with highest voltages in each phase are removed, the other modules continue to be locked and charged, a preset interval time T is waited for after the voltages of the power sub-modules are stable, the plurality of modules with highest voltages in each phase are continuously removed until the voltage value in each module reaches a rated value Vn of the preset module voltage after the modules are removed, and therefore the purpose that the voltage on each module is smoothly charged to the rated voltage in the starting process of the device is achieved.
The specific actions of cutting off the power sub-module are as follows: as shown in fig. 2, when the current flow direction in the system is out, G1 and G3 are turned on when the submodules are cut off. When the current flow direction in the system is in an inflow state, G2 and G4 are conducted when the submodules are cut off. When the sub-module is connected to the charging loop, the G1, G2, G3 and G4 are locked.
The above describes a basic embodiment of a charging control method for a serial-parallel multi-port flexible interconnection device, and the scheme provided by the application optimizes a pre-charging procedure when the serial-parallel multi-port flexible interconnection device is started, and when pre-charging is performed to a final stage, the voltage parameters of each power sub-module in a device are compared, the power sub-modules are cut off in batches according to the voltage of each power sub-module, and the voltage of each power sub-module is charged smoothly to a rated voltage step by step, so that the pre-charging voltage is reduced from an actual set voltage deviation, the effect of weakening impact current is achieved, and the normal operation of each device in the device is ensured.
As shown in fig. 6, further, the step 101 of enabling the feeder to charge each power sub-module in the multi-port flexible interconnection device specifically includes:
and 1011, carrying out uncontrolled charging on each power sub-module in the multi-port flexible interconnection equipment by the feeder line through the soft start resistor, and cutting off the soft start resistor to continue charging after the soft start resistor charges the voltage of each power sub-module to a stable state until the voltage of each power sub-module is charged again to the stable state.
It should be noted that, at this time, in the uncontrolled charging stage, the specific charging mode is to perform uncontrolled charging on the submodule through the soft start resistor until the charging voltage is basically stable, cut off the soft start resistor, continue charging, and enter the controllable charging stage after the voltage of the power submodule is stable.
As shown in fig. 7, further, in step 102, the voltages of the power sub-modules of the multi-port flexible interconnection device are monitored, after the voltages of the power sub-modules are charged to a stable state, voltage parameters of the power sub-modules are compared, a plurality of power sub-modules with highest voltages in each phase are determined, so that the determined power sub-modules are cut off, after the power sub-modules are cut off and a preset interval time elapses, the plurality of power sub-modules with highest voltages in each phase are re-determined, and the cutting off of the determined power sub-modules specifically includes:
step 1021, monitoring the voltage of each power sub-module of the multi-port flexible interconnection device, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, and determining a plurality of power sub-modules with the highest voltages in each phase by combining the initial removal quantity so as to remove the determined power sub-modules;
step 1022, after the power sub-modules are removed and a preset interval time passes, increasing the removal number, so as to re-determine a plurality of power sub-modules with highest voltages in each phase by combining the updated removal number, and removing the determined power sub-modules, wherein the removal number does not exceed a module number threshold.
Further, the calculation formula of the module number threshold is:
；
where Vz represents the phase voltage between any two phases, vn is the rated voltage of the power sub-module, and X1 is the module number threshold.
As shown in fig. 8, further, after determining the power sub-modules with the highest voltages in each phase in step 102, before cutting off the power sub-modules, the following optional steps may be included:
step 1001, when the power sub-module is a power sub-module in the PFCM and the PBCM, updating the determined power sub-module to enable the number of modules cut off by upper and lower bridge arms in each corresponding PFCM and PBCM to be kept consistent;
and 1002, when the power sub-module is a power sub-module in the SVG, updating the determined power sub-module to enable the number of modules cut off by each corresponding SVG in the three phases to be consistent.
After entering a controllable charging mode, carrying out sequencing comparison on the voltages in the modules, cutting off the 1 module with the highest voltage in each phase, if the cut-off is a sub-module in a power flow regulating module (PFCM) and a power balancing module (PBCM), keeping the cut-off number of the upper bridge arm and the lower bridge arm in each corresponding PFCM and PBCM consistent in the three phases, keeping the voltage equalizing of the upper bridge arm and the lower bridge arm, and if the cut-off module is a module in SVG, keeping the cut-off number of the SVG in each phase consistent in the three phases; the other modules continue to be locked and charged, waiting time T is shortened, after the voltage of the power sub-module is stabilized, 2 modules with highest voltage in each phase are cut off, after waiting time T, the modules with highest voltage in each phase are cut off continuously until the voltage value in each module reaches the rated value Vn of the preset module voltage after the rest x1 modules are cut off, charging control is carried out according to the control strategy, and when the voltage of the power sub-module reaches the rated voltage value, the starting process of the equipment is ended so far, and the system can be waited to enter an operation mode;
the calculation formula of the module number threshold value X1 is as follows:
；
where Vz represents the phase voltage between any two phases, vn is the rated voltage of the module, and X1 is the module number threshold, which may represent the minimum number of modules connected in series between the two phases.
The foregoing details of the embodiments of the charging control method of the serial-parallel multi-port flexible interconnection device provided by the application are the following details of the embodiments of the charging control device of the serial-parallel multi-port flexible interconnection device provided by the application, which are specifically as follows:
referring to fig. 9, a second embodiment of the present application provides a start-up control apparatus for a serial-parallel multi-port flexible interconnection device, including:
the first charging control unit 201 is configured to control a feeder switch of the multi-port flexible interconnection device when the multi-port flexible interconnection device is started, so that the multi-port flexible interconnection device accesses only one feeder, and locks all devices in the multi-port flexible interconnection device, so that the feeder charges each power sub-module in the multi-port flexible interconnection device;
the second charging control unit 202 is configured to monitor a voltage of each power sub-module of the multi-port flexible interconnection device, compare voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, determine a plurality of power sub-modules with highest voltage in each phase, so as to cut off the determined power sub-modules, and after the power sub-modules are cut off and a preset interval time, re-determine the plurality of power sub-modules with highest voltage in each phase, and cut off the determined power sub-modules until the voltage parameters of each remaining power sub-module reach a preset module voltage rating when the power sub-modules are cut off.
Further, the second charging control unit 202 is specifically configured to:
monitoring the voltage of each power sub-module of the multi-port flexible interconnection equipment, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, and determining a plurality of power sub-modules with the highest voltages in each phase by combining the initial cutting number so as to cut off the determined power sub-modules;
after the power sub-modules are cut off and a preset interval time passes, the cutting-off number is increased, so that the plurality of power sub-modules with the highest voltage in each phase are redetermined by combining the updated cutting-off number, and then the determined power sub-modules are cut off, wherein the cutting-off number does not exceed a module number threshold.
Further, after each determination of the number of power sub-modules with the highest voltages in each phase, the method further comprises:
the cutting module adjusting unit 200 is configured to update the determined power sub-module when the power sub-module is a power sub-module in the PFCM and the PBCM, so that the number of modules cut off by upper and lower bridge arms in each corresponding PFCM and PBCM in the three phases is kept consistent; or; when the power sub-module is a power sub-module in the SVG, updating the determined power sub-module to ensure that the number of modules cut off by each corresponding SVG in the three phases is kept consistent.
Further, the first charging control unit 201 is specifically configured to:
when the multi-port flexible interconnection equipment is started, a feeder switch of the multi-port flexible interconnection equipment is controlled, so that the multi-port flexible interconnection equipment is connected into only one feeder, all devices in the multi-port flexible interconnection equipment are locked, the feeder charges each power sub-module in the multi-port flexible interconnection equipment in an uncontrolled manner through a soft start resistor, and after the soft start resistor charges the voltage of each power sub-module to a stable state, the soft start resistor is cut off to continue charging until the voltage of each power sub-module is charged again to the stable state.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus and unit described above may refer to the corresponding process in the foregoing method embodiment, which is not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented, for example, in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (4)
1. The charging control method of the serial-parallel type multi-port flexible interconnection device is characterized by comprising the following steps of:
when the multi-port flexible interconnection equipment is started, a feeder switch of the multi-port flexible interconnection equipment is controlled, so that the multi-port flexible interconnection equipment is connected with only one feeder, and all devices in the multi-port flexible interconnection equipment are locked, so that the feeder charges all power sub-modules in the multi-port flexible interconnection equipment;
monitoring the voltage of each power sub-module of the multi-port flexible interconnection device, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, combining the initial cutting number to determine a plurality of power sub-modules with highest voltage in each phase, updating the determined power sub-modules when the power sub-modules are power sub-modules in PFCM and PBCM, so that the cutting number of upper and lower bridge arms in each corresponding PFCM and PBCM in three phases is kept consistent, and updating the determined power sub-modules when the power sub-modules are power sub-modules in SVG, so that the cutting number of each corresponding SVG in three phases is kept consistent, and cutting the determined power sub-modules;
after the power sub-modules are cut off and a preset interval time passes, the cutting-off number is increased, so that the plurality of power sub-modules with the highest voltage in each phase are redetermined by combining the updated cutting-off number, and then the determined power sub-modules are cut off until the voltage parameter of each power sub-module reaches a preset module voltage rated value after the power sub-modules are cut off;
wherein the number of resections does not exceed a module number threshold;
the calculation formula of the module number threshold value is as follows:
；
wherein V is z Representing the phase voltage between any two phases, V n And X1 is the module number threshold value and is the rated voltage of the power sub-module.
2. The method for controlling charging of a serial-parallel multi-port flexible interconnect device according to claim 1, wherein the enabling the feeder to charge each power sub-module in the multi-port flexible interconnect device specifically comprises:
and the feeder line carries out uncontrolled charging on each power sub-module in the multi-port flexible interconnection equipment through the soft start resistor, and after the soft start resistor charges the voltage of each power sub-module to a stable state, the soft start resistor is cut off to continue charging until the voltage of each power sub-module is charged to the stable state again.
3. A start-up control device for a serial-parallel multi-port flexible interconnect device, comprising:
the first charging control unit is used for controlling a feeder switch of the multi-port flexible interconnection equipment when the multi-port flexible interconnection equipment is started, so that the multi-port flexible interconnection equipment is connected with only one feeder, and all devices in the multi-port flexible interconnection equipment are locked, so that the feeder charges all power sub-modules in the multi-port flexible interconnection equipment;
the second charging control unit is used for monitoring the voltage of each power sub-module of the multi-port flexible interconnection device, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, determining a plurality of power sub-modules with the highest voltage in each phase, cutting off the determined power sub-modules, re-determining the plurality of power sub-modules with the highest voltage in each phase after the power sub-modules are cut off and a preset interval time is passed, cutting off the determined power sub-modules until the voltage parameters of each power sub-module remained after the power sub-modules are cut off reach a preset module voltage rated value;
the second charging control unit is specifically configured to:
monitoring the voltage of each power sub-module of the multi-port flexible interconnection equipment, comparing the voltage parameters of each power sub-module after the voltage of each power sub-module is charged to a stable state, and determining a plurality of power sub-modules with the highest voltages in each phase by combining the initial cutting number so as to cut off the determined power sub-modules;
the cutting module adjusting unit is used for updating the determined power sub-module when the power sub-module is the power sub-module in the PFCM and the PBCM, so that the number of the upper bridge arm and the lower bridge arm cut-off modules in each corresponding PFCM and PBCM in the three phases is kept consistent; or; when the power sub-module is a power sub-module in the SVG, updating the determined power sub-module to ensure that the number of modules cut off by each corresponding SVG in the three phases is kept consistent;
after the power sub-modules are cut off and a preset interval time passes, the cutting-off number is increased, so that the plurality of power sub-modules with the highest voltage in each phase are redetermined by combining the updated cutting-off number, and then the determined power sub-modules are cut off, wherein the cutting-off number does not exceed a module number threshold;
the calculation formula of the module number threshold value is as follows:
；
wherein V is z Representing the phase voltage between any two phases, V n And X1 is the module number threshold value and is the rated voltage of the power sub-module.
4. The starting control device of the serial-parallel multi-port flexible interconnection apparatus according to claim 3, wherein the first charging control unit is specifically configured to:
when the multi-port flexible interconnection equipment is started, a feeder switch of the multi-port flexible interconnection equipment is controlled, so that the multi-port flexible interconnection equipment is connected with only one feeder, all devices in the multi-port flexible interconnection equipment are blocked, the feeder is used for carrying out uncontrolled charging on each power sub-module in the multi-port flexible interconnection equipment through a soft start resistor, and after the soft start resistor charges the voltage of each power sub-module to a stable state, the soft start resistor is cut off to continue charging until the voltage of each power sub-module is charged to the stable state again.
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