CN112737292B - Control method, device, equipment and medium for improving current harmonic total distortion rate - Google Patents
Control method, device, equipment and medium for improving current harmonic total distortion rate Download PDFInfo
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Abstract
The invention discloses a control method and device for improving the total current harmonic distortion rate, electronic equipment and a computer storage medium, relates to the technical field of power electronic control, and aims to improve the total current harmonic distortion rate. The method comprises the following steps: calculating the absolute value of the difference value between the bus given voltage value and the bus sampling voltage value to obtain the current ripple voltage reference value; calculating the absolute value of the difference value between the current ripple voltage reference value and the feedback ripple voltage value to obtain a self-adaptive ripple voltage error value; calculating a self-adaptive capacitive reactance value according to the self-adaptive ripple voltage error value; calculating the fundamental wave sine frequency of double frequencies of the current input voltage value through a phase-locked loop algorithm; multiplying the current ripple current value, the adaptive capacitive reactance value and the second-frequency fundamental wave sine frequency to obtain a current ripple voltage value; and subtracting the current ripple voltage value from the bus sampling voltage value to obtain a voltage value without second harmonic.
Description
Technical Field
The invention relates to the technical field of power electronic control, in particular to a control method, a control device, control equipment and a control medium for improving the total distortion rate of current harmonics.
Background
With the continuous development of power electronic technology, switching power supplies with small size, high efficiency and high power density are widely developed and applied.
The switching power supply is connected with an alternating current power grid through a rectifier mostly, and a rear-stage circuit can have a large-capacity filter capacitor, at the moment, an AC input circuit is seriously distorted, so that a sine wave is not generated any more, but a high-amplitude spike pulse is generated, the fundamental wave component of input current is very low, the content of higher harmonics is increased, a large amount of current harmonic components flow back into the power grid, harmonic pollution to the power grid is caused, the generated harmonic voltage can distort the power grid voltage, the normal work of other equipment is influenced, the power grid resonance can be possibly caused, and the stability of the power grid is damaged.
In the prior art, an Active Power Factor Correction (APFC) circuit and a control mode exist, so that the size of a passive PFC (PFC) device can be effectively reduced, the input power factor is improved, the pollution of current harmonics to a power grid is restrained, and the interference of a power supply to the power grid is effectively reduced.
However, in the field of communication power supply, when the input current total harmonic component of the communication power supply system is adjusted, the requirement of input current total harmonic component (THDA) index class I (100% load- > 5%, 50% load- > 8%, 30% load- > 12%) in the national communication industry standard (YD/T7312018) must be met.
How to improve the total distortion rate of the current harmonics of the communication power supply is a problem to be solved at present.
Disclosure of Invention
The embodiment of the invention provides a control method, a control device, control equipment and a control medium for improving the total current harmonic distortion rate, so as to improve the total current harmonic distortion rate of a communication power supply.
In a first aspect, an embodiment of the present invention provides a control method for improving a total distortion rate of a current harmonic, which is applied to a single-phase PFC circuit, and includes the following steps:
acquiring a bus given voltage value, a bus sampling voltage value and a feedback ripple voltage value;
calculating the absolute value of the difference value between the bus given voltage value and the bus sampling voltage value to obtain a current ripple voltage reference value;
calculating the absolute value of the difference value between the current ripple voltage reference value and the feedback ripple voltage value to obtain a self-adaptive ripple voltage error value;
carrying out filtering operation and integral operation on the self-adaptive ripple voltage error value to obtain a self-adaptive capacitive reactance value;
acquiring a current input voltage value, calculating the fundamental wave sinusoidal frequency of the current input voltage value through a phase-locked loop algorithm, and calculating to obtain the fundamental wave sinusoidal frequency of double frequency according to the fundamental wave sinusoidal frequency;
obtaining a current ripple current value, and multiplying the current ripple current value, the adaptive capacitive reactance value and the second-frequency fundamental wave sinusoidal frequency to obtain a current ripple voltage value;
and subtracting the current ripple voltage value from the bus sampling voltage value to obtain a voltage value without second harmonic.
In some embodiments, after obtaining the voltage value without the second harmonic, the method further includes:
and multiplying the voltage value without the secondary filtering with the current input voltage value to obtain a given current value.
In some embodiments, the filtering and integrating operations on the adaptive ripple voltage error value include:
and sequentially carrying out low-pass filtering and integral operation on the self-adaptive ripple voltage error value through a low-pass filtering algorithm and a PID algorithm.
In some embodiments, the obtaining the present ripple current includes:
acquiring output power;
and dividing the output power by the bus sampling voltage value to obtain the current ripple current.
In some embodiments, the obtaining the present ripple current includes:
and acquiring the current ripple current through a sampling circuit or a sampling device.
In a second aspect, an embodiment of the present invention provides a control apparatus for improving a total distortion rate of a current harmonic, including:
the ripple error calculation module is used for acquiring a bus given voltage value, a bus sampling voltage value and a feedback ripple voltage value; calculating the absolute value of the difference value between the bus given voltage value and the bus sampling voltage value to obtain a current ripple voltage reference value; calculating the absolute value of the difference value between the current ripple voltage reference value and the feedback ripple voltage value to obtain a self-adaptive ripple voltage error value;
the ripple voltage calculation module is used for carrying out filtering operation and integral operation on the self-adaptive ripple voltage error value to obtain a self-adaptive capacitive reactance value; acquiring a current input voltage value, calculating the fundamental wave sinusoidal frequency of the current input voltage value through a phase-locked loop algorithm, and calculating to obtain the fundamental wave sinusoidal frequency of double frequency according to the fundamental wave sinusoidal frequency; obtaining a current ripple current value, and multiplying the current ripple current value, the adaptive capacitive reactance value and the second-frequency fundamental wave sinusoidal frequency to obtain a current ripple voltage value;
and the second harmonic removal module is used for subtracting the current ripple voltage value from the bus sampling voltage value to obtain a voltage value without second harmonic.
In a third aspect, an embodiment of the present invention provides a computer device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the processor implements the control method for improving the total distortion rate of current harmonics according to the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the control method for improving the total distortion rate of current harmonics according to the first aspect.
Compared with the prior art, the embodiment of the invention provides a control method, a control device, control equipment and a control medium for improving the total distortion rate of current harmonics.
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic flow chart of a control method for improving the total distortion rate of current harmonics according to the present invention;
FIG. 2 is a flowchart of a control method for improving the total distortion rate of current harmonics according to an embodiment of the present invention;
FIG. 3 is a block diagram of a control apparatus for improving the total distortion rate of current harmonics according to an embodiment of the present invention;
fig. 4 is a block diagram of the electronic device of the embodiment of the present invention.
Detailed Description
In order to make the purpose and technical solution of the present invention more apparent, the present invention will be described and illustrated with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments provided by the present invention, belong to the protection scope of the present application.
It is obvious that the drawings in the following description are only examples or embodiments of the present application, and that it is also possible for a person skilled in the art to apply the present application to other similar contexts on the basis of these drawings without inventive effort. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
When the single-phase PFC circuit uses a control strategy, a structure of a voltage outer ring and a current inner ring is adopted. The output of the voltage outer loop controller is given as the current inner loop, and if there is ripple voltage, the output of the voltage loop necessarily has reverse ripple envelope (basically second harmonic), in this case, the output of the voltage loop is multiplied by the sine of the current input voltage, so that the current given has second harmonic, and then the input current tracks the given current with the second harmonic, and the output current also necessarily has the second harmonic. Therefore, the invention ensures that the given current tracks pure voltage by removing the second harmonic existing in the voltage loop, and can effectively improve the total harmonic component of the input current, thereby improving the total distortion rate of the current harmonic.
Example 1
Based on the above principle, the present embodiment provides a control method for improving the total distortion rate of the current harmonics.
As shown in fig. 1 and fig. 2, the control method for improving the total distortion rate of the current harmonics is applied to a single-phase PFC circuit, and includes the following steps:
s101, acquiring a bus given voltage value, a bus sampling voltage value and a feedback ripple voltage value; calculating the absolute value of the difference value between the bus given voltage value and the bus sampling voltage value to obtain the current ripple voltage reference value; and calculating the absolute value of the difference value between the current ripple voltage reference value and the feedback ripple voltage value to obtain a self-adaptive ripple voltage error value.
The control method for improving the total distortion rate of the current harmonics of the present embodiment is performed based on a single-phase PFC circuit that employs the voltage outer loop and the current inner loop result. In one sampling control period, S101 is executed to obtain a given voltage value and a sampled voltage value of the output bus. The bus given voltage value is a fixed reference value, and the bus sampling voltage value is an actual value sampled and calibrated through an AD circuit.
The feedback ripple voltage value is the current ripple voltage value fed back in the last sampling control period. And if the current sampling control period is the first sampling control period, the feedback ripple voltage value is a ripple voltage initial value which is preset by the user.
And after subtracting the bus sampling voltage value from the bus given voltage value, calculating the absolute value of the obtained difference value to obtain the current ripple voltage reference value, wherein the current ripple voltage reference value is the actual difference value of the given voltage value and the sampling voltage value.
After subtracting the feedback ripple voltage value from the current ripple voltage reference value, the absolute value of the obtained difference is calculated, and a self-adaptive ripple voltage error value can be obtained.
If the difference value between the current ripple voltage reference value and the feedback ripple voltage value is zero, it indicates that the current ripple voltage value is the same as the feedback ripple voltage value, the second harmonic does not exist in the bus sampling voltage value, and the voltage loop output is a pure value, so that the given current determined according to the voltage loop output is a direct current value, and subsequent second harmonic removal operation does not need to be continued. It should be noted that it is an ideal situation that the difference between the current ripple voltage reference value and the feedback ripple voltage value is zero. However, in practical applications, the difference between the current ripple voltage reference value and the feedback ripple voltage value is generally erroneous, and therefore, subsequent operations still need to be performed.
S102, carrying out filtering operation and integral operation on the self-adaptive ripple voltage error value to obtain a self-adaptive capacitive reactance value; acquiring a current input voltage value, calculating the fundamental wave sinusoidal frequency of the current input voltage value through a phase-locked loop algorithm, and calculating to obtain the fundamental wave sinusoidal frequency of the second-order frequency according to the fundamental wave sinusoidal frequency; and obtaining the current ripple current value, and multiplying the current ripple current value, the adaptive capacitive reactance value and the frequency doubling fundamental wave sine frequency to obtain the current ripple voltage value.
And carrying out filtering and integral operation on the self-adaptive ripple voltage error value to obtain a self-adaptive capacitive reactance value Xc. The filtering operation and the integrating operation are conventional processing means in the art, and will not be described or illustrated in detail herein.
In this embodiment, a current input voltage value Vin is calculated by a phase-locked loop algorithm, so as to obtain an effective value Vrms of a phase lock and a fundamental sine frequency sin θ (θ ═ 2 × pi × 50) of the input voltage, and thus, a double-frequency fundamental sine frequency sin2 × θ can be calculated.
It should be noted that the pll algorithm is a conventional algorithm in the art, and the principle and calculation process thereof are not described in detail herein.
After the current ripple current value Irippe is obtained, the current ripple current value, the current capacitive reactance value and the second-order frequency fundamental wave sine frequency are multiplied through a multiplier according to a calculation formula Irippe Xc sin2 theta to obtain a current ripple voltage value.
It should be noted that there are various ways to obtain the current ripple current value in the technical field, and the obtaining way of the ripple current is not limited herein, and in practical application, the way to obtain the current ripple current can be selected by itself according to specific situations.
The current ripple voltage value obtained in S102 is the actual ripple voltage value of the current sampling control period, and the current ripple voltage value is fed back to the next sampling control period to be used as the feedback ripple voltage value of the next sampling control period, and used for calculating the adaptive ripple voltage error value in step S101 of the next sampling control period.
And S103, subtracting the difference value of the current ripple voltage value from the bus sampling voltage value to obtain a voltage value without second harmonic.
And subtracting the current ripple voltage value from the bus sampling voltage value, so that the second harmonic in the bus sampling voltage value can be removed, and a voltage value without the second harmonic is obtained. Therefore, for the single-phase PFC circuit, after the second harmonic is removed through the steps, the voltage output by the voltage outer loop controller does not have the second harmonic, the voltage loop is output to be multiplied by the sine of the current input voltage, the obtained current is given and does not have the second harmonic, so that the current is given and tracked to be relatively pure voltage sine fundamental waves, the current loop is also subjected to sine tracking when the current loop is sampled and tracked, the THDA is effectively promoted, the total distortion rate of the current harmonic is effectively improved, and the relatively pure and clean power grid is ensured.
In this embodiment, in each sampling control period, the method for improving the total distortion rate of the current harmonic of this embodiment is performed, that is, steps S101 to S103 are cyclically performed to continuously remove the second harmonic in the voltage, so as to ensure that the voltage loop outputs a relatively pure voltage sinusoidal fundamental wave, so that the current loop can track the relatively pure voltage sinusoidal fundamental wave, thereby increasing THDA and improving the total distortion rate of the current harmonic.
The ripple voltage or ripple current described in this embodiment refers to the higher harmonic component in the current or voltage, which may cause the current or voltage amplitude to change. By removing the higher harmonic component in the voltage ring, the higher harmonic component in the current ring is reduced, so that the total harmonic component of the input current is effectively improved, the total harmonic component of the input current of the communication power supply meets the national standard, and the total distortion rate of the current harmonic of the communication power supply is improved.
The values are explained in the embodiment, when the voltage loop is adjusted, only the THDA needs to meet the requirement of national standard class I, namely, 100% load- > 5%, without obtaining completely pure output voltage; 50% load- > 8%; 30% load- > 12%.
Preferably, after obtaining the voltage value without the second harmonic, the method further includes:
and multiplying the voltage value without the secondary filtering with the current input voltage value to obtain a given current value.
In the voltage outer-loop current inner-loop structure of the single-phase PFC circuit, it is common knowledge to calculate a given current value according to a bus sampling voltage value, and details thereof are not described herein.
In some embodiments, the filtering and integrating operations on the adaptive ripple voltage error value include:
and sequentially carrying out low-pass filtering and integral operation on the self-adaptive ripple voltage error value through a low-pass filtering algorithm and a PID algorithm.
Specifically, the low-pass filter algorithm may be a low-pass filter, and the PID algorithm may employ a PID regulator.
Preferably, obtaining the present ripple current includes:
acquiring output power;
and dividing the output power by the bus sampling voltage value to obtain the current ripple current.
In order to save cost and improve current sampling efficiency and accuracy, output power can be obtained, and the current ripple current is directly calculated through an electric power calculation formula.
In another embodiment, the present ripple current may also be collected by a sampling circuit or a sampling device to obtain the present ripple current. Specifically, a conventional sampling circuit or sampling equipment is selected according to actual conditions to collect the current, and for example, the sampling equipment may be a current transformer, which is not limited herein.
Example 2
The present embodiment provides a control device for improving the total current harmonic distortion, which is used to implement the above embodiments and the preferred embodiments, and has been described without further description, and the terms "module", "unit", "subunit", and the like used below can implement a combination of software and/or hardware of predetermined functions. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware or a combination of software and hardware is also possible and contemplated.
Fig. 3 is a block diagram of a control apparatus for improving the total distortion rate of current harmonics according to an embodiment of the present invention, as shown in fig. 3, the apparatus includes:
the ripple error calculation module 21 is configured to obtain a bus given voltage value, a bus sampling voltage value, and a feedback ripple voltage value; calculating the absolute value of the difference value between the bus given voltage value and the bus sampling voltage value to obtain the current ripple voltage reference value; calculating the absolute value of the difference value between the current ripple voltage reference value and the feedback ripple voltage value to obtain a self-adaptive ripple voltage error value;
the ripple voltage calculation module 22 is configured to perform filtering operation and integral operation on the adaptive ripple voltage error value to obtain an adaptive capacitive reactance value; acquiring a current input voltage value, calculating the fundamental wave sinusoidal frequency of the current input voltage value through a phase-locked loop algorithm, and calculating to obtain the fundamental wave sinusoidal frequency of the second-order frequency according to the fundamental wave sinusoidal frequency; obtaining a current ripple current value, and multiplying the current ripple current value, a self-adaptive capacitive reactance value and a frequency-doubled fundamental wave sine frequency to obtain a current ripple voltage value;
and the second harmonic removal module 23 is configured to subtract the current ripple voltage value from the bus sampling voltage value to obtain a voltage value without the second harmonic.
The above modules may be functional modules or program modules, and may be implemented by software or hardware. For a module implemented by hardware, the modules may be located in the same processor; or the modules can be respectively positioned in different processors in any combination.
Example 3
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 4, an electronic device is provided, where the electronic device may be a server, and its internal structural diagram may be as shown in fig. 4. The electronic device comprises a processor, a memory, an input device and an output device; wherein the number of processors in the electronic device may be one or more, and one processor is taken as an example in fig. 4; the processor, memory, input devices and output devices in the electronic apparatus may be connected by a bus or other means, and fig. 4 illustrates the connection by a bus as an example.
The memory, which is a computer-readable storage medium, may include a high-speed random access memory, a non-volatile memory, and the like, and may be used to store an operating system, a software program, a computer-executable program, and a database, such as program instructions/modules corresponding to the control method for improving the total distortion rate of current harmonics according to embodiment 1 of the present invention, and may further include a memory, which may be used to provide an operating environment for the operating system and the computer program. In some examples, the memory may further include memory located remotely from the processor, and these remote memories may be connected to the electronic device through a network.
The processor, which is used to provide computing and control capabilities, may include a Central Processing Unit (CPU), or A Specific Integrated Circuit (ASIC), or may be configured to implement one or more Integrated circuits of embodiments of the present Application. The processor executes various functional applications and data processing of the electronic device by running the computer-executable program, software program, instructions and modules stored in the memory, that is, implements the control method of embodiment 1 for improving the total distortion rate of current harmonics.
The output device of the electronic equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on a shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
The electronic device may further include a network interface/communication interface, the network interface of the electronic device being for communicating with an external terminal through a network connection. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Those skilled in the art will appreciate that the configuration shown in fig. 4 is a block diagram of only a portion of the configuration associated with the present application, and does not constitute a limitation on the electronic device to which the present application is applied, and a particular electronic device may include more or less components than those shown in the drawings, or may combine certain components, or have a different arrangement of components.
It will be understood by those skilled in the art that all or part of the processes of the control method for improving the total distortion rate of the current harmonic according to embodiment 1 can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the computer program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
Example 4
An embodiment of the present invention provides a storage medium containing computer-executable instructions, which when executed by a computer processor, implement a control method for improving a current harmonic total distortion rate, the method including:
acquiring a bus given voltage value, a bus sampling voltage value and a feedback ripple voltage value;
calculating the absolute value of the difference value between the bus given voltage value and the bus sampling voltage value to obtain the current ripple voltage reference value;
calculating the absolute value of the difference value between the current ripple voltage reference value and the feedback ripple voltage value to obtain a self-adaptive ripple voltage error value;
carrying out filtering operation and integral operation on the self-adaptive ripple voltage error value to obtain a self-adaptive capacitive reactance value;
acquiring a current input voltage value, calculating the fundamental wave sinusoidal frequency of the current input voltage value through a phase-locked loop algorithm, and calculating to obtain the fundamental wave sinusoidal frequency of the second-order frequency according to the fundamental wave sinusoidal frequency;
obtaining a current ripple current value, and multiplying the current ripple current value, a self-adaptive capacitive reactance value and a frequency-doubled fundamental wave sine frequency to obtain a current ripple voltage value;
and subtracting the current ripple voltage value from the bus sampling voltage value to obtain a voltage value without second harmonic.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the operation of the control method for improving the total distortion rate of the current harmonics according to the above-mentioned embodiments, and may also perform the related operation in the control method for improving the total distortion rate of the current harmonics according to any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk, or an optical disk of a computer, and includes instructions for enabling an electronic device (which may be a mobile phone, a personal computer, a server, or a network device) to execute the control method for improving the total current harmonic distortion rate according to the embodiments of the present invention.
It should be noted that, in the above embodiment of the control method for improving the total distortion rate of the current harmonics, the included units and modules are only divided according to the functional logic, but not limited to the above division, as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as referred to herein means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (7)
1. A control method for improving the total distortion rate of current harmonics is applied to a single-phase PFC circuit and comprises the following steps:
acquiring a bus given voltage value, a bus sampling voltage value and a feedback ripple voltage value, wherein the feedback ripple voltage value is a current ripple voltage value fed back in a last sampling control period, and the current sampling control period is a first sampling control period, so that the feedback ripple voltage value is a ripple voltage initial value which is set in advance;
calculating the absolute value of the difference value between the bus given voltage value and the bus sampling voltage value to obtain a current ripple voltage reference value;
calculating the absolute value of the difference value between the current ripple voltage reference value and the feedback ripple voltage value to obtain a self-adaptive ripple voltage error value;
carrying out filtering operation and integral operation on the self-adaptive ripple voltage error value to obtain a self-adaptive capacitive reactance value;
acquiring a current input voltage value, calculating the fundamental wave sinusoidal frequency of the current input voltage value through a phase-locked loop algorithm, and calculating to obtain the fundamental wave sinusoidal frequency of double frequency according to the fundamental wave sinusoidal frequency;
obtaining a current ripple current value, and multiplying the current ripple current value, the adaptive capacitive reactance value, and the frequency-doubled fundamental wave sinusoidal frequency to obtain a current ripple voltage value, wherein the current ripple voltage value is an actual ripple voltage value of a current sampling control period, and the current ripple voltage value is fed back to a next sampling control period to be used as a feedback ripple voltage value of the next sampling control period, and is used for calculating an adaptive ripple voltage error value in the next sampling control period;
subtracting the current ripple voltage value from the bus sampling voltage value to obtain a voltage value without second harmonic;
after obtaining the voltage value without the second harmonic, the method further includes:
and multiplying the voltage value without the second harmonic wave by the sine of the current input voltage to obtain a given current value.
2. The control method for improving the total distortion rate of current harmonics according to claim 1, wherein the filtering and integrating operations of the adaptive ripple voltage error value comprise:
and sequentially carrying out low-pass filtering and integral operation on the self-adaptive ripple voltage error value through a low-pass filtering algorithm and a PID algorithm.
3. The control method for improving the total distortion rate of current harmonics according to claim 1, wherein the obtaining the current ripple current value comprises:
acquiring output power;
and dividing the output power by the bus sampling voltage value to obtain the current ripple current.
4. The control method for improving the total distortion rate of current harmonics according to claim 1, wherein the obtaining the current ripple current comprises:
and acquiring the current ripple current through a sampling circuit or a sampling device.
5. A control apparatus for improving the total distortion rate of current harmonics, comprising:
the ripple error calculation module is used for acquiring a bus given voltage value, a bus sampling voltage value and a feedback ripple voltage value; calculating the absolute value of the difference value between the bus given voltage value and the bus sampling voltage value to obtain a current ripple voltage reference value; calculating the absolute value of the difference value between the current ripple voltage reference value and the feedback ripple voltage value to obtain a self-adaptive ripple voltage error value; the feedback ripple voltage value is a current ripple voltage value fed back in a last sampling control period, and if the current sampling control period is a first sampling control period, the feedback ripple voltage value is a ripple voltage initial value which is preset by a user;
the ripple voltage calculation module is used for carrying out filtering operation and integral operation on the self-adaptive ripple voltage error value to obtain a self-adaptive capacitive reactance value; acquiring a current input voltage value, calculating the fundamental wave sinusoidal frequency of the current input voltage value through a phase-locked loop algorithm, and calculating to obtain the fundamental wave sinusoidal frequency of double frequency according to the fundamental wave sinusoidal frequency; obtaining a current ripple current value, and multiplying the current ripple current value, the adaptive capacitive reactance value and the second-frequency fundamental wave sinusoidal frequency to obtain a current ripple voltage value; when the current ripple voltage value is the actual ripple voltage value of the current sampling control period, feeding back the current ripple voltage value to the next sampling control period to serve as the feedback ripple voltage value of the next sampling control period, and calculating the adaptive ripple voltage error value in the next sampling control period;
the second harmonic removal module is used for subtracting the current ripple voltage value from the bus sampling voltage value to obtain a voltage value without second harmonic;
and the given current value calculating module is used for multiplying the voltage value without the second harmonic by the sine of the current input voltage after the voltage value without the second harmonic is obtained, so as to obtain the given current value.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the control method for improving the total distortion rate of current harmonics according to any one of claims 1 to 4 when executing the computer program.
7. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the control method for improving the total distortion rate of current harmonics according to any one of claims 1 to 4.
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