CN117394354B - Current equalizing method and device of inverter, inversion system and storage medium - Google Patents
Current equalizing method and device of inverter, inversion system and storage medium Download PDFInfo
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- CN117394354B CN117394354B CN202311684644.2A CN202311684644A CN117394354B CN 117394354 B CN117394354 B CN 117394354B CN 202311684644 A CN202311684644 A CN 202311684644A CN 117394354 B CN117394354 B CN 117394354B
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- 238000010586 diagram Methods 0.000 description 7
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
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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
Abstract
The invention discloses a current sharing method, a device, an inversion system and a storage medium of an inverter, which are used for realizing current sharing when the output ends of multiple inverters are connected in parallel at high frequency, wherein the method comprises the following steps: acquiring a voltage difference value between the bus voltage and a given bus voltage reference value; when the voltage difference value is in a first preset range, the active power and the reactive power of at least two groups of inverters connected in parallel are regulated according to different gradient intervals corresponding to the voltage difference value; and when the voltage difference value is in a second preset range, adjusting the working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference value. According to the invention, the active power and the reactive power output by the inverters are regulated according to the range of the voltage difference value of the bus voltage and the given bus voltage reference value, so that the active current and the reactive current output by each inverter are equalized, the bus voltage is ensured to be in a normal range, and the reliability and the stability of a power supply system are improved.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a current equalizing method and device of an inverter, an inversion system and a storage medium.
Background
With the rapid development of information technology, the requirements on the capacity, performance and reliability of a power supply system are higher and higher, and the continuous and deep research of power electronic technology is promoted, so that the research field is widened continuously. The realization of a large-capacity power supply by parallel connection of multiple modules is recognized as one of important directions of the development of the power conversion technology nowadays. The multiple inverters are connected in parallel, so that the reliability of a power supply system can be fundamentally improved, the cost is reduced, the capacity of the system can be conveniently provided, and redundancy is realized.
However, when a mode of parallel connection of a plurality of high-frequency modules is adopted for power supply, parallel connection among the high-frequency modules may cause uneven output current of each parallel connection module due to parameter difference, driving delay and the like of each parallel connection module, and some modules have large output current and some modules have small output current, so that heat generation among inverters is inconsistent, and particularly when the number of parallel connection is large, bus overvoltage is easily caused, even output is stopped, and power failure occurs.
Disclosure of Invention
In order to solve the problems, embodiments of the present application provide a current equalizing method, device, inverter system and storage medium for an inverter.
In a first aspect, an embodiment of the present application provides a current equalizing method of an inverter, where the method includes:
acquiring a voltage difference value between the bus voltage and a given bus voltage reference value;
when the voltage difference value is in a first preset range, the active power and the reactive power of at least two groups of inverters connected in parallel are regulated according to different gradient intervals corresponding to the voltage difference value;
and when the voltage difference value is in a second preset range, adjusting the working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference value.
Preferably, the method comprises:
dividing the first preset range according to a first preset threshold value and a second preset threshold value to obtain at least four different gradient intervals; the first preset threshold value is smaller than 0V, and the second preset threshold value is larger than 0V;
and matching corresponding adjusting parameters for each gradient interval.
Preferably, when the voltage difference is in the first preset range, the adjusting the active power and the reactive power of at least two groups of inverters connected in parallel according to different gradients corresponding to the voltage difference includes:
when the voltage difference value is in a first preset range, acquiring the gradient interval corresponding to the voltage difference value;
and adjusting the active power and the reactive power of at least two groups of inverters connected in parallel according to the adjusting parameters corresponding to the gradient interval.
Preferably, when the voltage difference is in the second preset range, the adjusting the working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference includes:
dividing the second preset range according to a third preset threshold value and a fourth preset threshold value to obtain at least three different gradient intervals; the third preset threshold is greater than 0V, and the third preset threshold is less than the fourth preset threshold;
when the voltage difference value is in a second preset range, if the voltage difference value is smaller than the third preset threshold value, controlling the modulator PWM to perform pulse width modulation;
if the voltage difference value is larger than the fourth preset threshold value, controlling the PWM of the modulator to stop working;
and if the voltage difference is larger than the third preset threshold and smaller than the fourth preset threshold, controlling the working state of the PWM modulator to be unchanged.
In a second aspect, an embodiment of the present application provides a current equalizing device of an inverter, where the device includes:
the acquisition module is used for acquiring a voltage difference value between the bus voltage and a given bus voltage reference value;
the first adjusting module is used for adjusting the active power and the reactive power of at least two groups of inverters connected in parallel according to different gradient intervals corresponding to the voltage difference value when the voltage difference value is in a first preset range;
and the second adjusting module is used for adjusting the working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference value when the voltage difference value is in a second preset range.
Preferably, the method further comprises a dividing module, wherein the dividing module is used for:
dividing the first preset range according to a first preset threshold value and a second preset threshold value to obtain at least four different gradient intervals; the first preset threshold value is smaller than 0V, and the second preset threshold value is larger than 0V;
and matching corresponding adjusting parameters for each gradient interval.
Preferably, the first adjusting module is specifically configured to:
when the voltage difference value is in a first preset range, acquiring the gradient interval corresponding to the voltage difference value;
and adjusting the active power and the reactive power of at least two groups of inverters connected in parallel according to the adjusting parameters corresponding to the gradient interval.
Preferably, the second adjusting module is specifically configured to:
dividing the second preset range according to a third preset threshold value and a fourth preset threshold value to obtain at least three different gradient intervals; the third preset threshold is greater than 0V, and the third preset threshold is less than the fourth preset threshold;
when the voltage difference value is in a second preset range, if the voltage difference value is smaller than the third preset threshold value, controlling the modulator PWM to perform pulse width modulation;
if the voltage difference value is larger than the fourth preset threshold value, controlling the PWM of the modulator to stop working;
and if the voltage difference is larger than the third preset threshold and smaller than the fourth preset threshold, controlling the working state of the PWM modulator to be unchanged.
In a third aspect, embodiments of the present application provide an inverter system, the system including: at least a first inverter and a second inverter, a first inverter controller, a second inverter controller, and a modulator PWM; the first inverter and the second inverter are connected in parallel and then connected into the first inverter controller; the first inverter controller, the second inverter controller and the modulator PWM are sequentially connected in series;
the first inversion controller is used for obtaining a voltage difference value between bus voltage and a given bus voltage reference value; when the voltage difference value is in a first preset range, the active power and the reactive power of at least two groups of inverters connected in parallel are regulated according to different gradient intervals corresponding to the voltage difference value;
and the second inverter controller is used for adjusting the working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference value when the voltage difference value is in a second preset range.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method as provided by the first aspect or any one of the possible implementations of the first aspect.
The beneficial effects of the invention are as follows: and regulating the active power and the reactive power output by the inverters according to the range of the voltage difference value of the bus voltage and the given bus voltage reference value, so that the active current and the reactive current output by each inverter are equalized, the bus voltage is ensured to be in a normal range, and the reliability and the stability of a power supply system are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flow chart of a current equalizing method of an inverter according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a current equalizing device of an inverter according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an inverter system according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in 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.
In the following description, the terms "first," "second," and "first," are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The following description provides various embodiments of the present application, and various embodiments may be substituted or combined, so that the present application is also intended to encompass all possible combinations of the same and/or different embodiments described. Thus, if one embodiment includes feature A, B, C and another embodiment includes feature B, D, then the present application should also be considered to include embodiments that include one or more of all other possible combinations including A, B, C, D, although such an embodiment may not be explicitly recited in the following.
The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made in the function and arrangement of elements described without departing from the scope of the application. Various examples may omit, replace, or add various procedures or components as appropriate. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.
For a better understanding of the present invention, the meaning of the terms appearing herein will first be explained before describing the present invention.
Active power refers to the power actually consumed in alternating current, which is used to convert electrical energy into other forms of energy, such as light energy, thermal energy, mechanical energy, and the like. In power transmission, the transmission of active power causes a voltage drop, and thus it is necessary to maintain a stable active power output.
Reactive power refers to the absorption of energy from a power source by an electric or magnetic field during a portion of a cycle and the release of energy during another portion of the cycle in an ac circuit with reactance, the average power being zero throughout the cycle. Reactive power is used to establish a magnetic field in the grid to support the operation of the electrical equipment. Although reactive power itself does not produce energy, it is an important factor in maintaining stable operation of the grid. In power transmission, the transmission of reactive power causes a voltage rise, and thus it is necessary to control the output of reactive power.
The given bus voltage reference value refers to a target value of bus voltage calculated according to parameters such as an incoming line power supply, a power factor and the like in order to ensure stable operation of a system in a control system of the frequency converter. In practical applications, the bus voltage needs to be consistent with a given bus voltage reference value to ensure normal operation of the frequency converter and smooth operation of the motor. If the bus voltage is below the reference value, it may cause the motor to drop or stop, and if the bus voltage is above the reference value, it may cause the motor to overheat or even burn out.
Referring to fig. 1, fig. 1 is a flow chart of a current equalizing method of an inverter according to an embodiment of the present application. In an embodiment of the present application, the method includes:
step S110, obtaining a voltage difference between the bus voltage and a given bus voltage reference value.
In actual operation, the incoming line power supply, the power factor and the actual running condition of the frequency converter all influence the bus voltage. Depending on the actual operating situation, the bus voltage may be higher or lower than a given bus voltage reference. In this embodiment, the given bus voltage reference value may be calculated according to a preset parameter, and in addition, an actual bus voltage may be detected by a voltage measurement device.
And step S120, when the voltage difference value is in a first preset range, the active power and the reactive power of at least two groups of inverters connected in parallel are regulated according to different gradient intervals corresponding to the voltage difference value.
In this embodiment, when the bus voltage is greater than the given bus voltage reference value, the voltage difference is a positive number; when the bus voltage is smaller than the given bus voltage reference value, the voltage difference is negative, and in addition, the bus voltage can be far larger than the given bus voltage reference value or far smaller than the given bus voltage reference value, so that gradient interval division is required for the voltage difference, proper adjustment is performed when the bus voltage and the given bus voltage reference value are far different, current sharing is maintained, and the bus voltage is ensured to be in a normal range.
In one embodiment, the method comprises:
dividing a first preset range according to a first preset threshold value and a second preset threshold value to obtain at least four different gradient intervals; the first preset threshold value is smaller than 0V, and the second preset threshold value is larger than 0V;
corresponding control variables are matched for each gradient interval.
In this embodiment, the first preset range is divided by the first preset threshold value and the second preset threshold value, and when the bus voltage is smaller than the first preset threshold value or larger than the second preset threshold value, the bus voltage and the given bus voltage reference value can be considered to be greatly different.
Illustratively, the first preset threshold is Δv1 and the second preset threshold is Δv2. When the difference between the bus voltage and the given bus voltage reference value is smaller than Δv1, the adjustment parameter K1 is a coefficient larger than 1, such as 1.2, and when the difference between the bus voltage and the given bus voltage reference value is larger than Δv1 and smaller than 0, the adjustment parameter k1=1- (V0-V1)/Δv1. When the difference between the bus voltage and the given bus voltage reference value is greater than DeltaV 2, the adjustment parameter K1 is a coefficient smaller than 1, such as 0.8; when the difference between the bus voltage and the given bus voltage reference value is smaller than Δv2 and larger than 0, the adjustment parameter k1=1- (V1-V0)/Δv2, where V1 is the bus voltage and V0 is the bus voltage reference value. The specific values described above are exemplary, and may be other values that meet the conditions, which are not limited thereto.
In one embodiment, when the voltage difference is in the first preset range, the active power and the reactive power of at least two groups of inverters connected in parallel are adjusted according to different gradients corresponding to the voltage difference, including:
when the voltage difference value is in a first preset range, acquiring a gradient interval corresponding to the voltage difference value;
and adjusting the active power and the reactive power of at least two groups of inverters connected in parallel according to the adjusting parameters corresponding to the gradient interval.
In this embodiment, corresponding adjustment parameters may be determined according to a gradient interval corresponding to the voltage difference, so as to adjust active power and reactive power of at least two groups of inverters connected in parallel based on the adjustment parameters. For example, if the active power of the inverter is W1 and the adjustment parameter is K1, the adjusted active power w2=w1×k1. Similarly, if the reactive power of the inverter is W3 and the adjustment parameter is K2, the adjusted reactive power w4=w3×k2. Here, the active power and reactive power of the inverter refer to the total active power and reactive power of the plurality of inverters connected in parallel.
Step S130, when the voltage difference is in the second preset range, the working state of the modulator PWM is adjusted according to different gradient intervals corresponding to the voltage difference.
Pulse width modulation, PWM, is a control technique that modulates the pulse width to equivalently obtain a desired waveform by modulating the width of a series of pulses. In this embodiment, the working state of the modulator PWM is adjusted according to different gradient intervals corresponding to the voltage difference, so as to determine whether PWM modulation is required. Here, the PWM modulation may include Sinusoidal pulse width modulation (SPWM, sinusidial PWM) and space vector pulse width modulation (SVPWM, space Vector PulseWidth Modulation).
In one embodiment, when the voltage difference is in the second preset range, the adjusting the working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference includes:
dividing a second preset range according to a third preset threshold value and a fourth preset threshold value to obtain at least three different gradient intervals; the third preset threshold is greater than 0V, and the third preset threshold is less than the fourth preset threshold;
when the voltage difference value is in the second preset range, if the voltage difference value is smaller than a third preset threshold value, controlling a modulator PWM to perform pulse width modulation;
if the voltage difference value is larger than a fourth preset threshold value, controlling the PWM of the modulator to stop working;
if the voltage difference is larger than the third preset threshold and smaller than the fourth preset threshold, the working state of the PWM of the modulator is controlled to be unchanged.
Taking the third preset threshold value and the fourth preset threshold value as DeltaV 3 and DeltaV 4 for illustration, respectively, when the voltage is smaller than DeltaV 3, the modulator PWM is controlled to perform pulse width modulation. And when the difference between the bus voltage and the given bus voltage reference value is larger than delta V4, controlling the modulator PWM to stop working. When the difference between the bus voltage and the given bus voltage reference value is between DeltaV 3 and DeltaV 4, the operating state of the control modulator PWM remains unchanged. Here, the specific values of Δv3 and Δv4 may be determined according to actual needs, and this is not limited.
According to the method and the device, the active power and the reactive power output by the inverters are regulated according to the range of the voltage difference value of the bus voltage and the given bus voltage reference value, so that the active current and the reactive current output by each inverter are equalized, the bus voltage is ensured to be in a normal range, and the reliability and the stability of a power supply system are improved.
The following describes in detail a current equalizing device of an inverter provided in an embodiment of the present application with reference to fig. 2. It should be noted that fig. 2 is a schematic structural diagram of a current sharing device of an inverter, which is provided in an embodiment of the present application, and is used to execute the method of the embodiment of fig. 1 of the present application, for convenience of explanation, only a portion related to the embodiment of the present application is shown, and specific technical details are not disclosed, please refer to the embodiment shown in fig. 1 of the present application.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a current sharing device of an inverter according to an embodiment of the present application. As shown in fig. 2, the current equalizing device 200 of the inverter includes:
an obtaining module 210, configured to obtain a voltage difference between the bus voltage and a given bus voltage reference value;
the first adjusting module 220 is configured to adjust the active power and the reactive power of at least two groups of inverters connected in parallel according to different gradient intervals corresponding to the voltage difference when the voltage difference is in a first preset range;
the second adjusting module 230 is configured to adjust the working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference when the voltage difference is in the second preset range.
In one embodiment, the current sharing apparatus 200 of the inverter further includes a dividing module, where the dividing module is configured to:
dividing a first preset range according to a first preset threshold value and a second preset threshold value to obtain at least four different gradient intervals; the first preset threshold value is smaller than 0V, and the second preset threshold value is larger than 0V;
corresponding control variables are matched for each gradient interval.
In one embodiment, the first adjustment module 220 is specifically configured to:
when the voltage difference value is in a first preset range, acquiring a gradient interval corresponding to the voltage difference value;
and adjusting the active power and the reactive power of at least two groups of inverters connected in parallel according to the adjusting parameters corresponding to the gradient interval.
In one embodiment, the second adjustment module 230 is specifically configured to:
dividing a second preset range according to a third preset threshold value and a fourth preset threshold value to obtain at least three different gradient intervals; the third preset threshold is greater than 0V, and the third preset threshold is less than the fourth preset threshold;
when the voltage difference value is in the second preset range, if the voltage difference value is smaller than a third preset threshold value, controlling a modulator PWM to perform pulse width modulation;
if the voltage difference value is larger than a fourth preset threshold value, controlling the PWM of the modulator to stop working;
if the voltage difference is larger than the third preset threshold and smaller than the fourth preset threshold, the working state of the PWM of the modulator is controlled to be unchanged.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an inverter system according to an embodiment of the present application. The system comprises: at least first and second inverters 310 and 320, first inverter controller 330, second inverter controller 340, and modulator PWM350; the first inverter 310 and the second inverter 320 are connected in parallel and then connected into the first inverter controller 330; the first inverter controller 330, the second inverter controller 340 and the modulator PWM350 are sequentially connected in series;
a first inverter controller 330 for obtaining a voltage difference between the bus voltage and a given bus voltage reference value; when the voltage difference value is in a first preset range, the active power and the reactive power of at least two groups of inverters connected in parallel are regulated according to different gradient intervals corresponding to the voltage difference value;
the second inverter controller 340 is configured to adjust the operating state of the modulator PWM350 according to different gradient intervals corresponding to the voltage difference when the voltage difference is within the second preset range.
In this embodiment, the inverter system may further include a CAN communication module and an inverter dual-loop control module. The CAN communication module is used for completing data transmission among the modules. The inversion double-loop control module is used for an inner loop and an outer loop of the inverter system. The inverter double-loop control means that the inner loop control and the outer loop control are adopted simultaneously in the control of the inverter. The inner loop control refers to controlling the quality of the inverter output voltage, and the outer loop control refers to controlling the magnitude of the inverter output voltage. The inner loop control typically employs current loop control and the outer loop control typically employs voltage loop control. The control mode can improve the output voltage quality of the inverter and reduce harmonic waves and noise.
It will be apparent to those skilled in the art that the embodiments of the present application may be implemented in software and/or hardware. "Unit" and "module" in this specification refer to software and/or hardware capable of performing a specific function, either alone or in combination with other components, such as Field programmable gate arrays (Field-Programmable Gate Array, FPGAs), integrated circuits (Integrated Circuit, ICs), etc.
The processing units and/or modules of the embodiments of the present application may be implemented by an analog circuit that implements the functions described in the embodiments of the present application, or may be implemented by software that executes the functions described in the embodiments of the present application.
Referring to fig. 4, a schematic structural diagram of an electronic device according to an embodiment of the present application is shown, where the electronic device may be used to implement the method in the embodiment shown in fig. 1. As shown in fig. 4, the electronic device 400 may include: at least one central processor 401, at least one network interface 404, a user interface 403, a memory 405, at least one communication bus 402.
Wherein communication bus 402 is used to enable connected communications between these components.
The user interface 403 may include a Display screen (Display) and a Camera (Camera), and the optional user interface 403 may further include a standard wired interface and a standard wireless interface.
The network interface 404 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface), among others.
Wherein the central processor 401 may comprise one or more processing cores. The central processor 401 connects various parts within the entire electronic device 400 using various interfaces and lines, performs various functions of the terminal 400 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 405, and calling data stored in the memory 405. Alternatively, the central processor 401 may be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), programmable logic array (Programmable Logic Array, PLA). The central processor 401 may integrate one or a combination of several of a central processor (Central Processing Unit, CPU), an image central processor (Graphics Processing Unit, GPU), and a modem, etc. The CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the display screen; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the cpu 401 and may be implemented by a single chip.
The Memory 405 may include a random access Memory (Random Access Memory, RAM) or a Read-Only Memory (Read-Only Memory). Optionally, the memory 405 includes a non-transitory computer readable medium (non-transitory computer-readable storage medium). Memory 405 may be used to store instructions, programs, code sets, or instruction sets. The memory 405 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the above-described various method embodiments, etc.; the storage data area may store data or the like referred to in the above respective method embodiments. The memory 405 may also optionally be at least one storage device located remotely from the aforementioned central processor 401. As shown in fig. 4, an operating system, a network communication module, a user interface module, and program instructions may be included in the memory 405, which is a type of computer storage medium.
The present application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above method. The computer readable storage medium may include, among other things, any type of disk including floppy disks, optical disks, DVDs, CD-ROMs, micro-drives, and magneto-optical disks, ROM, RAM, EPROM, EEPROM, DRAM, VRAM, flash memory devices, magnetic or optical cards, nanosystems (including molecular memory ICs), or any type of media or device suitable for storing instructions and/or data.
It should be noted that, for simplicity of description, the foregoing method embodiments are all expressed as a series of action combinations, but it should be understood by those skilled in the art that the present application is not limited by the order of actions described, as some steps may be performed in other order or simultaneously in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required in the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, such as the division of the units, merely a logical function division, and there may be additional manners of dividing the actual implementation, such as 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 through some service interface, device or unit indirect coupling or communication connection, electrical or otherwise.
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 each embodiment of the present application 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 memory. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a memory, including several 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 described in the embodiments of the present application. And the aforementioned memory includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in the various methods of the above embodiments may be performed by hardware associated with a program that is stored in a computer readable memory, which may include: flash disk, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), magnetic or optical disk, and the like.
The foregoing is merely exemplary embodiments of the present disclosure and is not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.
Claims (8)
1. A current sharing method of an inverter, for implementing current sharing when output ends of multiple inverters are connected in parallel at high frequency, the method comprising:
acquiring a voltage difference value between the bus voltage and a given bus voltage reference value;
when the voltage difference value is in a first preset range, the active power and the reactive power of at least two groups of inverters connected in parallel are regulated according to regulating parameters of different gradient intervals corresponding to the voltage difference value; dividing the first preset range according to a first preset threshold, 0V and a second preset threshold to obtain at least four different gradient intervals; the first preset threshold value is smaller than 0V, and the second preset threshold value is larger than 0V; matching corresponding adjusting parameters for each gradient interval;
when the voltage difference value is in a second preset range, adjusting the working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference value; dividing the second preset range according to a third preset threshold value and a fourth preset threshold value to obtain at least three different gradient intervals; the third preset threshold is greater than 0V, and the third preset threshold is less than the fourth preset threshold.
2. The method according to claim 1, wherein adjusting the active power and the reactive power of at least two sets of inverters connected in parallel according to different gradients corresponding to the voltage difference when the voltage difference is within a first preset range comprises:
when the voltage difference value is in a first preset range, acquiring the gradient interval corresponding to the voltage difference value;
and adjusting the active power and the reactive power of at least two groups of inverters connected in parallel according to the adjusting parameters corresponding to the gradient interval.
3. The method according to claim 1, wherein adjusting the operating state of the modulator PWM according to different gradient intervals corresponding to the voltage difference when the voltage difference is within a second preset range comprises:
when the voltage difference value is in a second preset range, if the voltage difference value is smaller than the third preset threshold value, controlling the modulator PWM to perform pulse width modulation;
if the voltage difference value is larger than the fourth preset threshold value, controlling the PWM of the modulator to stop working;
and if the voltage difference is larger than the third preset threshold and smaller than the fourth preset threshold, controlling the working state of the PWM modulator to be unchanged.
4. A current sharing apparatus of an inverter, the apparatus comprising:
the acquisition module is used for acquiring a voltage difference value between the bus voltage and a given bus voltage reference value;
the first adjusting module is used for adjusting the active power and the reactive power of at least two groups of inverters connected in parallel according to the adjusting parameters of different gradient intervals corresponding to the voltage difference value when the voltage difference value is in a first preset range; dividing the first preset range according to a first preset threshold, 0V and a second preset threshold to obtain at least four different gradient intervals; the first preset threshold value is smaller than 0V, and the second preset threshold value is larger than 0V; matching corresponding adjusting parameters for each gradient interval;
the second adjusting module is used for adjusting the working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference value when the voltage difference value is in a second preset range; dividing the second preset range according to a third preset threshold value and a fourth preset threshold value to obtain at least three different gradient intervals; the third preset threshold is greater than 0V, and the third preset threshold is less than the fourth preset threshold.
5. The apparatus of claim 4, wherein the first adjustment module is specifically configured to:
when the voltage difference value is in a first preset range, acquiring the gradient interval corresponding to the voltage difference value;
and adjusting the active power and the reactive power of at least two groups of inverters connected in parallel according to the adjusting parameters corresponding to the gradient interval.
6. The device according to claim 4, wherein the second adjustment module is specifically configured to:
when the voltage difference value is in a second preset range, if the voltage difference value is smaller than the third preset threshold value, controlling the modulator PWM to perform pulse width modulation;
if the voltage difference value is larger than the fourth preset threshold value, controlling the PWM of the modulator to stop working;
and if the voltage difference is larger than the third preset threshold and smaller than the fourth preset threshold, controlling the working state of the PWM modulator to be unchanged.
7. An inverter system, the system comprising: at least a first inverter and a second inverter, a first inverter controller, a second inverter controller, and a modulator PWM; the first inverter and the second inverter are connected in parallel and then connected into the first inverter controller; the first inverter controller, the second inverter controller and the modulator PWM are sequentially connected in series;
the first inversion controller is used for obtaining a voltage difference value between bus voltage and a given bus voltage reference value;
when the voltage difference value is in a first preset range, the active power and the reactive power of at least two groups of inverters connected in parallel are regulated according to regulating parameters of different gradient intervals corresponding to the voltage difference value; dividing the first preset range according to a first preset threshold, 0V and a second preset threshold to obtain at least four different gradient intervals; the first preset threshold value is smaller than 0V, and the second preset threshold value is larger than 0V; matching corresponding adjusting parameters for each gradient interval;
the second inverter controller is configured to adjust a working state of the modulator PWM according to different gradient intervals corresponding to the voltage difference when the voltage difference is in a second preset range; dividing the second preset range according to a third preset threshold value and a fourth preset threshold value to obtain at least three different gradient intervals; the third preset threshold is greater than 0V, and the third preset threshold is less than the fourth preset threshold.
8. A computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method according to any of claims 1-3.
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