CN117595688A - Target value self-adaption method of bus voltage of inverter, controller and inverter - Google Patents
Target value self-adaption method of bus voltage of inverter, controller and inverter Download PDFInfo
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- CN117595688A CN117595688A CN202311567015.1A CN202311567015A CN117595688A CN 117595688 A CN117595688 A CN 117595688A CN 202311567015 A CN202311567015 A CN 202311567015A CN 117595688 A CN117595688 A CN 117595688A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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Abstract
The invention provides a target value self-adaption method of bus voltage of an inverter, a controller and the inverter. The inverter comprises a bus and an inverter circuit, wherein the input end of the inverter circuit is connected with the bus, and the output end of the inverter circuit is connected with an alternating current power grid; the method comprises the following steps: acquiring a plurality of sampling values of the modulated wave in a current period; the modulation wave is a waveform generated according to a target value of the bus voltage and used for adjusting the output voltage of the inverter circuit; if the ratio of the first quantity to the total quantity is greater than or equal to a first preset percentage, the target value of the control bus voltage is increased; the first quantity is the quantity that the absolute value of the sampling value of the modulation wave in the current period is larger than a first threshold value; the total number is the total number of sampled values of the modulated wave in the current period. The self-adaptive bus voltage control method and device can achieve self-adaptation of the target value of the bus voltage, avoid overmodulation, prevent modulated waves from being truncated, and avoid affecting power grid harmonic waves.
Description
Technical Field
The present invention relates to the technical field of inverters, and in particular, to a target value adaptive method for a bus voltage of an inverter, a controller and an inverter.
Background
In the inverter, if the target value of the bus voltage is set too high, adverse effects are usually generated on the temperature rise and the overall efficiency of devices in the inverter, so that the target value of the bus voltage is not set too high, and the setting method has good effect under the condition of good power grid condition.
However, under the poor operating mode of power grid harmonic, if the target value setting of busbar voltage is too low, the phenomenon that the loop harmonic compensation uses the modulated wave is easy to appear overmodulation, and the modulated wave can appear the phenomenon of cutting off the top, and then aggravates the deterioration of power grid harmonic.
Disclosure of Invention
The embodiment of the invention provides a target value self-adaption method of a bus voltage of an inverter, a controller and the inverter, and aims to solve the problem that overmodulation is easy to occur and further the deterioration of power grid harmonic is aggravated if the target value of the bus voltage of the inverter is set too low under the working condition of poor power grid harmonic in the prior art.
In a first aspect, an embodiment of the present invention provides a target value adaptive method for a bus voltage of an inverter, where the inverter includes a bus and an inverter circuit, an input end of the inverter circuit is connected to the bus, and an output end of the inverter circuit is connected to an ac power grid; the target value self-adaption method of the bus voltage of the inverter comprises the following steps:
acquiring a plurality of sampling values of the modulated wave in a current period; the modulation wave is a waveform generated according to a target value of the bus voltage and used for adjusting the output voltage of the inverter circuit;
if the ratio of the first quantity to the total quantity is greater than or equal to a first preset percentage, the target value of the control bus voltage is increased; the first quantity is the quantity that the absolute value of the sampling value of the modulation wave in the current period is larger than a first threshold value; the total number is the total number of sampled values of the modulated wave in the current period.
In one possible implementation manner, after obtaining a plurality of sampling values of the modulated wave in the current period, the target value adaptive method of the bus voltage of the inverter further includes:
if the ratio of the second quantity to the total quantity is greater than or equal to a second preset percentage, the target value of the control bus voltage is reduced; the second number is the number that the absolute value of the sampling value of the modulation wave in the current period is smaller than a second threshold value; the second threshold is less than the first threshold.
In one possible implementation, the first threshold value and the second threshold value are determined based on a preset demand range of a target value of the bus voltage.
In one possible implementation, controlling the target value of the bus voltage to decrease includes:
the target value of the control bus voltage is reduced by a first preset voltage value.
In one possible implementation, controlling the target value of the bus voltage to increase includes:
the target value of the control bus voltage is raised by a second preset voltage value.
In one possible implementation, after the target value of the control bus voltage increases, the target value adaptation method of the bus voltage of the inverter further includes:
generating a new modulated wave based on the target value of the raised bus voltage;
based on the new modulated wave, a switching tube in the inverter circuit is controlled.
In a second aspect, an embodiment of the present invention provides a target value adaptive device for a bus voltage of an inverter, where the inverter includes a bus and an inverter circuit, an input end of the inverter circuit is connected to the bus, and an output end of the inverter circuit is connected to an ac power grid; the target value adaptive device for the bus voltage of an inverter comprises:
the acquisition module is used for acquiring a plurality of sampling values of the modulation wave in the current period; the modulation wave is a waveform generated according to a target value of the bus voltage and used for adjusting the output voltage of the inverter circuit;
the self-adaptive module is used for controlling the target value of the bus voltage to rise if the ratio of the first quantity to the total quantity is larger than or equal to a first preset percentage; the first quantity is the quantity that the absolute value of the sampling value of the modulation wave in the current period is larger than a first threshold value; the total number is the total number of sampled values of the modulated wave in the current period.
In a third aspect, an embodiment of the present invention provides a controller, including a memory for storing a computer program, and a processor for calling and running the computer program stored in the memory, and executing the target value adaptation method of the bus voltage of the inverter according to the first aspect or any possible implementation manner of the first aspect.
In a fourth aspect, an embodiment of the present invention provides an inverter, including a bus bar, an inverter circuit, and a controller according to the third aspect; the input end of the inverter circuit is connected with a bus, and the output end of the inverter circuit is connected with an alternating current power grid; the inverter circuit is controlled by the controller.
In a fifth aspect, an embodiment of the present invention provides a computer readable storage medium storing a computer program, which when executed by a processor implements the steps of a method for adapting a target value of a bus voltage of an inverter according to the first aspect or any possible implementation manner of the first aspect.
The embodiment of the invention provides a target value self-adaption method of bus voltage of an inverter, a controller and the inverter.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a target value adaptive method of a bus voltage of an inverter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a modulated wave in the prior art;
fig. 3 is a schematic diagram of a modulated wave after using a target value adaptation method of a bus voltage of an inverter provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a target value adaptive device for a bus voltage of an inverter according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a controller according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, a flowchart of an implementation of a target value adaptive method of a bus voltage of an inverter according to an embodiment of the present invention is shown. The main body of execution of the target value adaptation method of the bus voltage of the inverter may be a controller.
The inverter comprises a bus and an inverter circuit, wherein the input end of the inverter circuit is connected with the bus, and the output end of the inverter circuit is connected with an alternating current power grid. The bus is a direct current bus, and the inverter circuit is used for converting direct current into alternating current. The inverter may further include other circuits, such as a dc-dc conversion circuit, an output terminal of the dc-dc conversion circuit being connected to a bus, and the like, without being particularly limited thereto.
The target value self-adaption method of the bus voltage of the inverter comprises the following steps:
in S101, acquiring a plurality of sampling values of a modulated wave in a current period; the modulation wave is a waveform generated according to a target value of the bus voltage for adjusting the output voltage of the inverter circuit.
In this embodiment, one sampling value of the modulated wave may be collected every preset time period, where the preset time period is less than a time period of a single period, and the period may be a period of the mains supply. The preset time period can be set according to actual requirements, for example, can be determined according to the switching frequency of the inverter circuit.
In some possible implementations, the determination of when to start acquisition and when to end acquisition of a sampled value of the modulated wave may be made by zero crossing detection of the modulated wave. The present value of the modulated wave is collected once every preset time period as one sampling value, and the collection is stopped when the second zero crossing point which is switched from the negative value to the positive value is detected, so that the sampling of the modulated wave in one period is completed.
The target value of the bus voltage is a voltage value to be reached by the bus voltage by corresponding control.
The modulation wave is a waveform generated according to a target value of the bus voltage and used for adjusting the output voltage of the inverter circuit, and a driving signal used for driving each switching tube in the inverter circuit can be generated according to the modulation wave, and then each switching tube is controlled by the corresponding driving signal.
The target value of the bus voltage may correspond to the input voltage of the inverter circuit, and is a dc voltage, which needs to be converted to an ac voltage. The absolute value of the modulated wave can be understood as the duty cycle, the absolute value of the modulated wave being greater than or equal to 0 and less than 1. The target value of the bus voltage is multiplied by the real time value of the modulated wave to obtain the real time value of the output voltage of the inverter circuit. Since the ac voltage is divided into positive and negative, the modulated wave is also divided into positive and negative.
Each phase has a corresponding modulation wave, and the modulation wave in S101 may be any modulation wave.
In S102, if the ratio of the first number to the total number is greater than or equal to a first preset percentage, the target value of the control bus voltage is increased; the first quantity is the quantity that the absolute value of the sampling value of the modulation wave in the current period is larger than a first threshold value; the total number is the total number of sampled values of the modulated wave in the current period.
In order to ensure that the inverter circuit outputs a stable alternating voltage, the waveform of the modulated wave changes with the change of the target value of the bus voltage. When the target value of the bus voltage is lower and the power grid harmonic is worse, the peak value of the modulation wave is large, so that the peak value exceeds the upper limit value of the modulation wave, and the phenomenon of roof cutting, namely the phenomenon of overmodulation, occurs. Referring to fig. 2, fig. 2 shows modulated waves of a phase a, a phase B and a phase C, which are not used in the method of the present application, when the target value of the bus voltage is low and the power grid harmonic is poor, and in fig. 2, the three waveforms correspond to the modulated waves of a phase a, the modulated waves of B phase and the modulated waves of C phase, respectively. The modulated wave in fig. 2 exhibits a truncated phenomenon, i.e., an overmodulation phenomenon.
To solve this problem, the present embodiment acquires a plurality of sampling values of a modulated wave in a current period by sampling the modulated wave in one period, and acquires the number of sampling values, of all the sampling values in the current period, whose absolute value is larger than a first threshold value as a first number. The number of all sample values of the current period is taken as the total number. If the ratio of the first number to the total number is detected to be greater than or equal to a first preset percentage, the target value of the bus voltage is considered to be too low, so that an overmodulation phenomenon occurs or is about to occur, and the problem of overmodulation can be solved by controlling the target value of the bus voltage value to rise.
The first threshold value is a value between 0 and 1, which may be a value smaller than the upper limit value of the absolute value of the modulated wave and close to the upper limit value of the absolute value of the modulated wave, and may be set according to actual requirements or related experiments. For example, it may be 0.98 or 0.97, etc.
Since the number of modulated waves whose values are close to or greater than the upper limit value is small, the first preset percentage is a small value, which can be determined according to actual requirements or related experiments. For example, it may be 1%, 2% or 3%, etc.
The magnitude of the target value rise of the control bus voltage may be determined according to actual demands or related experiments, and is not particularly limited herein.
Fig. 3 shows a schematic diagram of a three-phase modulated wave after using the method of the present application, without overmodulation.
According to the method, the device and the system, the plurality of sampling values of the modulation wave in the current period are obtained, if the ratio of the absolute value of the sampling values of the modulation wave in the current period to the total value is larger than or equal to a first threshold value and is larger than or equal to a first preset percentage, the phenomenon of overmodulation is shown or is about to occur, at this time, the target value of the bus voltage is controlled to rise, the modulation wave is influenced, the self-adaption of the target value of the bus voltage can be realized, the overmodulation phenomenon is avoided, the modulation wave does not occur the roof cutting phenomenon any more, and the influence on the power grid harmonic wave is avoided.
In some embodiments, after the step S101, the method for adapting a target value of a bus voltage of the inverter further includes:
if the ratio of the second quantity to the total quantity is greater than or equal to a second preset percentage, the target value of the control bus voltage is reduced; the second number is the number that the absolute value of the sampling value of the modulation wave in the current period is smaller than a second threshold value; the second threshold is less than the first threshold.
When the target value of the bus voltage is too high, the device temperature rise in the inverter, the overall efficiency, and the like are adversely affected, and therefore, the target value of the bus voltage is not too high.
To solve this problem, the present embodiment acquires a plurality of sampling values of the modulated wave in the current period by sampling the modulated wave in one period, and acquires the number of sampling values, of which absolute values are smaller than a second threshold, among all the sampling values in the current period as the second number. If the ratio of the second number to the total number is detected to be greater than or equal to a second preset percentage, the target value of the bus voltage is considered to be set too high, the device temperature rise, the overall efficiency and the like are affected, and the problem can be solved by controlling the target value of the bus voltage to be reduced.
Wherein the second threshold is a value between 0 and 1 and is less than the first threshold. The second threshold may be a value smaller than the first threshold and smaller than the first threshold, and may be set according to actual requirements or related experiments. For example, it may be 0.96 or 0.95, etc.
Since the absolute value of the modulated wave is smaller than the second threshold by a larger amount, the second preset percentage is a larger value, and can be determined according to actual requirements or related experiments. For example, 99%, 98%, 97% or 96%, etc.
In some embodiments, the first threshold and the second threshold are determined based on a preset demand range of a target value of the bus voltage.
The preset demand range of the target value of the bus voltage is a range in which the target value of the bus voltage is desired. The magnitudes of the first threshold and the second threshold may be determined by experiments or by correlation calculations or the like through the preset demand range.
For example, the lower limit value of the preset demand range of the target value of the bus voltage may be a preset lower limit value, and the upper limit value may be a preset upper limit value. That is, the target value of the bus voltage is greater than or equal to the preset lower limit value and less than or equal to the preset upper limit value.
In some embodiments, the reducing the target value of the control bus voltage includes:
the target value of the control bus voltage is reduced by a first preset voltage value.
In some embodiments, in the step S102, the step of increasing the target value of the control bus voltage includes:
the target value of the control bus voltage is raised by a second preset voltage value.
The first preset voltage value and the second preset voltage value may be equal or unequal, and both are smaller values. For example, the first preset voltage value and the second preset voltage value may be 3V, or the first preset voltage value may be 3V, the second preset voltage value may be 2V, and so on. The first preset voltage value and the second preset voltage value can be determined according to actual requirements or related experiments.
In some embodiments, in the step S102, after the target value of the control bus voltage increases, the target value adaptation method of the bus voltage of the inverter further includes:
generating a new modulated wave based on the target value of the raised bus voltage;
based on the new modulated wave, a switching tube in the inverter circuit is controlled.
The present embodiment can generate a new modulation wave according to the target value of the bus voltage after rising and the required range of the output voltage of the inverter circuit, generate driving signals for controlling each switching tube in the inverter circuit based on the new modulation wave, and control the corresponding switching tube according to the corresponding driving signals.
In some possible implementations, after the target value of the control bus voltage decreases, the target value adaptive method of the bus voltage of the inverter further includes:
generating a new modulated wave based on the reduced bus voltage target value;
based on the new modulated wave, a switching tube in the inverter circuit is controlled.
The target value adaptive method of the bus voltage of the inverter provided in this embodiment may be executed in each period, or may be executed once in several periods, which is not particularly limited herein.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present invention.
The following are device embodiments of the invention, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 4 is a schematic structural diagram of a target value adaptive device for a bus voltage of an inverter according to an embodiment of the present invention, and for convenience of explanation, only a portion related to the embodiment of the present invention is shown, which is described in detail below:
the inverter comprises a bus and an inverter circuit, wherein the input end of the inverter circuit is connected with the bus, and the output end of the inverter circuit is connected with an alternating current power grid. As shown in fig. 4, the target value adaptation device 30 of the bus voltage of the inverter may include: an acquisition module 31 and an adaptation module 32.
An acquisition module 31, configured to acquire a plurality of sampling values of the modulated wave in a current period; the modulation wave is a waveform generated according to a target value of the bus voltage and used for adjusting the output voltage of the inverter circuit;
an adaptive module 32, configured to control the target value of the bus voltage to increase if the ratio of the first number to the total number is greater than or equal to a first preset percentage; the first quantity is the quantity that the absolute value of the sampling value of the modulation wave in the current period is larger than a first threshold value; the total number is the total number of sampled values of the modulated wave in the current period.
In one possible implementation, the adaptation module 32 is further configured to: after a plurality of sampling values of the modulation wave in the current period are obtained, if the ratio of the second number to the total number is larger than or equal to a second preset percentage, the target value of the bus voltage is controlled to be reduced; the second number is the number that the absolute value of the sampling value of the modulation wave in the current period is smaller than a second threshold value; the second threshold is less than the first threshold.
In one possible implementation, the first threshold value and the second threshold value are determined based on a preset demand range of a target value of the bus voltage.
In one possible implementation, in the adaptive module 32, controlling the target value of the bus voltage to decrease includes:
the target value of the control bus voltage is reduced by a first preset voltage value.
In one possible implementation, in the adaptive module 32, controlling the target value of the bus voltage to rise includes:
the target value of the control bus voltage is raised by a second preset voltage value.
In one possible implementation, in the adaptive module 32, after the target value of the control bus voltage increases, the target value adaptive method of the bus voltage of the inverter further includes:
generating a new modulated wave based on the target value of the raised bus voltage;
based on the new modulated wave, a switching tube in the inverter circuit is controlled.
Fig. 5 is a schematic diagram of a controller according to an embodiment of the present invention. As shown in fig. 5, the controller 4 of this embodiment includes: a processor 40 and a memory 41. The memory 41 is used for storing a computer program 42, and the processor 40 is used for calling and running the computer program 42 stored in the memory 41, and executing the steps in the above-mentioned target value adaptation method embodiment of the bus voltage of each inverter, for example, S101 to S102 shown in fig. 1. Alternatively, the processor 40 is configured to invoke and run the computer program 42 stored in the memory 41 to implement the functions of the modules/units in the above-described device embodiments, such as the functions of the modules/units 31 to 32 shown in fig. 4.
Illustratively, the computer program 42 may be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to complete the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program 42 in the controller 4. For example, the computer program 42 may be split into the modules/units 31 to 32 shown in fig. 4.
The controller 4 may include, but is not limited to, a processor 40, a memory 41. It will be appreciated by those skilled in the art that fig. 4 is merely an example of the controller 4 and is not meant to be limiting of the controller 4, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the controller may further include input and output devices, network access devices, buses, etc.
The processor 40 may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field-programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the controller 4, such as a hard disk or a memory of the controller 4. The memory 41 may be an external storage device of the controller 4, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the controller 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the controller 4. The memory 41 is used for storing the computer program and other programs and data required by the controller. The memory 41 may also be used for temporarily storing data that has been output or is to be output.
Corresponding to the controller, the embodiment also provides an inverter, which comprises a bus, an inverter circuit and the controller; the input end of the inverter circuit is connected with a bus, and the output end of the inverter circuit is connected with an alternating current power grid; the inverter circuit is controlled by the controller.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment 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, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/controller and method may be implemented in other manners. For example, the apparatus/controller embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions in actual implementation, 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 may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
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 modules/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 present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by instructing related hardware by a computer program, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each embodiment of the current sharing control method when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will 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 technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (10)
1. The target value self-adaption method of the bus voltage of the inverter is characterized in that the inverter comprises a bus and an inverter circuit, wherein the input end of the inverter circuit is connected with the bus, and the output end of the inverter circuit is connected with an alternating current power grid; the target value self-adaption method of the bus voltage of the inverter comprises the following steps:
acquiring a plurality of sampling values of the modulated wave in a current period; the modulation wave is a waveform generated according to a target value of the bus voltage and used for adjusting the output voltage of the inverter circuit;
if the ratio of the first quantity to the total quantity is greater than or equal to a first preset percentage, controlling the target value of the bus voltage to rise; the first quantity is the quantity that the absolute value of the sampling value of the modulation wave in the current period is larger than a first threshold value; the total number is the total number of sampling values of the modulated wave in the current period.
2. The method according to claim 1, characterized in that after the acquisition of a plurality of sampling values of the modulated wave in the current period, the method further comprises:
if the ratio of the second number to the total number is greater than or equal to a second preset percentage, controlling the target value of the bus voltage to be reduced; the second number is the number that the absolute value of the sampling value of the modulation wave in the current period is smaller than a second threshold value; the second threshold is less than the first threshold.
3. The method for adapting a target value of a bus voltage of an inverter according to claim 2, wherein the first threshold value and the second threshold value are determined based on a preset demand range of the target value of the bus voltage.
4. The method for adapting the target value of the bus voltage of the inverter according to claim 2, wherein the controlling the target value of the bus voltage to decrease includes:
and controlling the target value of the bus voltage to reduce a first preset voltage value.
5. The method for adapting the target value of the bus voltage of the inverter according to claim 1, wherein the controlling the target value of the bus voltage to rise includes:
and controlling the target value of the bus voltage to rise by a second preset voltage value.
6. The target value adaptation method of the bus voltage of the inverter according to any one of claims 1 to 5, characterized in that the target value adaptation method of the bus voltage of the inverter further comprises, after the control of the increase of the target value of the bus voltage:
generating a new modulated wave based on the target value of the raised bus voltage;
and controlling a switching tube in the inverter circuit based on the new modulation wave.
7. The target value self-adapting device of the bus voltage of the inverter is characterized in that the inverter comprises a bus and an inverter circuit, wherein the input end of the inverter circuit is connected with the bus, and the output end of the inverter circuit is connected with an alternating current power grid; the target value adaptive device of the bus voltage of the inverter comprises:
the acquisition module is used for acquiring a plurality of sampling values of the modulation wave in the current period; the modulation wave is a waveform generated according to a target value of the bus voltage and used for adjusting the output voltage of the inverter circuit;
the self-adaptive module is used for controlling the target value of the bus voltage to rise if the ratio of the first quantity to the total quantity is larger than or equal to a first preset percentage; the first quantity is the quantity that the absolute value of the sampling value of the modulation wave in the current period is larger than a first threshold value; the total number is the total number of sampling values of the modulated wave in the current period.
8. A controller comprising a memory for storing a computer program and a processor for calling and running the computer program stored in the memory, performing the target value adaptation method of the bus voltage of the inverter according to any one of claims 1 to 6.
9. An inverter comprising a bus bar, an inverter circuit, and the controller of claim 8; the input end of the inverter circuit is connected with the bus, and the output end of the inverter circuit is connected with an alternating current power grid; the inverter circuit is controlled by the controller.
10. A computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the method for adapting a target value of a bus voltage of an inverter according to any one of claims 1 to 6.
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| CN202311567015.1A CN117595688A (en) | 2023-11-22 | 2023-11-22 | Target value self-adaption method of bus voltage of inverter, controller and inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311567015.1A CN117595688A (en) | 2023-11-22 | 2023-11-22 | Target value self-adaption method of bus voltage of inverter, controller and inverter |
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