阅读说明：本技术 输出电压控制方法、系统、单相逆变电源及存储介质 (Output voltage control method and system, single-phase inverter power supply and storage medium ) 是由 谢力华 张学杰 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种输出电压控制方法、系统、单相逆变电源及存储介质,所述方法包括：获取所述逆变器的电压瞬时值给定和实时采样所述逆变器的输出电压瞬时值；计算所述电压瞬时值给定和输出电压瞬时值的误差,并根据所述误差获取动态调节量；将所述动态调节量叠加到所述逆变器的电压有效值给定上,得到新的逆变电压有效值给定,并根据所述新的逆变电压有效值给定实时更新逆变电压瞬时给定,以及使用所述逆变电压瞬时给定控制所述逆变器运行。本发明通过实时调整逆变器的电压给定,可在不增加任何硬件电路的情况下大大提高逆变器输出电压的响应速度。(The invention discloses an output voltage control method, a system, a single-phase inverter power supply and a storage medium, wherein the method comprises the following steps: acquiring voltage instantaneous value setting of the inverter and sampling an output voltage instantaneous value of the inverter in real time; calculating the error between the voltage instantaneous value setting and the output voltage instantaneous value, and acquiring a dynamic adjustment quantity according to the error; and superposing the dynamic regulating quantity on the voltage effective value given of the inverter to obtain a new inverter voltage effective value given, updating the instantaneous inverter voltage given in real time according to the new inverter voltage effective value given, and controlling the inverter to operate by using the instantaneous inverter voltage given. The invention can greatly improve the response speed of the output voltage of the inverter under the condition of not increasing any hardware circuit by adjusting the voltage setting of the inverter in real time.)

1. An output voltage control method is applied to a single-phase inverter power supply, the single-phase inverter power supply comprises an inverter and an inverter controller, and the method is characterized by comprising the following steps:

acquiring voltage instantaneous value setting of the inverter and sampling an output voltage instantaneous value of the inverter in real time;

calculating the error between the voltage instantaneous value setting and the output voltage instantaneous value, and acquiring a dynamic adjustment quantity according to the error;

and superposing the dynamic regulating quantity on the voltage effective value given of the inverter to obtain a new inverter voltage effective value given, updating the instantaneous inverter voltage given in real time according to the new inverter voltage effective value given, and controlling the inverter to operate by using the instantaneous inverter voltage given.

2. The output voltage control method according to claim 1, wherein the obtaining a dynamic adjustment amount according to the error includes:

when the error is greater than or equal to a preset dynamic threshold value, determining a dynamic adjustment time length according to the error, wherein the larger the error at the moment of entering the dynamic adjustment, the longer the dynamic adjustment time length;

and calculating the dynamic adjustment quantity in real time through a dynamic adjustment control link in the dynamic adjustment duration.

3. The output voltage control method of claim 2, further comprising:

and adjusting the preset dynamic threshold according to the wave-generating phase angle position of the inverter.

4. The output voltage control method according to claim 3, wherein the adjusting the preset dynamic threshold according to the inverter wave phase angle position comprises:

when the wave-sending phase angle is close to a zero crossing point, setting the preset dynamic threshold value as a first preset value;

and when the wave-sending phase angle is close to the peak point, setting the preset dynamic threshold value as a second preset value, wherein the second preset value is larger than the first preset value.

5. The output voltage control method according to claim 2, wherein the obtaining of the inverter voltage instantaneous given according to the new inverter voltage effective value given comprises:

and multiplying the given voltage effective value of the inverter by the sine value of the phase locking angle of the inverter to obtain the given inversion voltage instantaneous value.

6. The output voltage control method according to claim 2, wherein the obtaining a dynamic adjustment amount according to the error includes:

and when the error is smaller than the preset dynamic threshold value, keeping the dynamic adjustment amount unchanged.

7. An output voltage control system is applied to a single-phase inverter power supply, the single-phase inverter power supply comprises an inverter and an inverter controller, the system is characterized by further comprising a sampling unit, a dynamic adjusting unit and an alternating current given unit, wherein:

the sampling unit is used for acquiring voltage instantaneous value setting of the inverter and sampling the output voltage instantaneous value of the inverter in real time;

the dynamic adjusting unit is used for calculating the errors of the voltage instantaneous value setting and the inversion voltage instantaneous value and acquiring a dynamic adjusting quantity according to the errors;

the alternating current given unit is used for superposing the dynamic adjustment quantity and the voltage effective value given of the inverter to obtain a new voltage effective value given, updating the instantaneous inversion voltage given in real time according to the new voltage effective value given, and enabling the inversion controller to control the inverter to operate through the instantaneous inversion voltage given.

8. The output voltage control system according to claim 7, wherein the dynamic adjustment unit determines a dynamic adjustment duration according to the error when the error is greater than or equal to a preset dynamic threshold, and calculates a dynamic adjustment amount in real time through a dynamic adjustment control link within the dynamic adjustment duration;

the larger the error at the moment of entering dynamic adjustment is, the longer the dynamic adjustment time is, and the preset dynamic threshold is determined according to the wave-sending phase angle of the inverter.

9. A single-phase inverter power supply comprising a storage unit and a processing unit, wherein the storage unit stores therein a computer program executable by the processing unit, and the processing unit implements the steps of the output voltage control method according to any one of claims 1 to 6 when executing the computer program.

10. A storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the output voltage control method according to any one of claims 1 to 6.

Technical Field

The invention relates to the technical field of power supply control, in particular to an output voltage control method, an output voltage control system, a single-phase inverter power supply and a storage medium.

Background

The single-phase inverter power supply is the most common power supply in daily life, and many household appliances, small-sized industrial equipment, electric power equipment and the like use the single-phase power supply for power supply. In a single-phase inverter power supply, a stable and reliable voltage is provided for equipment mainly through a single-phase inverter.

As shown in FIG. 1, the effective value of the single-phase inverter is given by U_rmsPreset for the system, multiplier 11 gives the effective value U_rmsAnd the product of the sine value Sinwt of the phase-locked angle generated by the phase-locked loop 12 is used as the voltage given value of the dynamic regulation link, namely Uref is Urms Sinwt, and the output voltage of the inverter is subjected to closed-loop regulation.

Generally, the main performance index of a single-phase inverter is output voltage stabilization accuracy. But this is far from sufficient for some relatively sophisticated devices, others such as output voltage total harmonic distortion and voltage dynamic transients are also critical. For example, in the communications industry standards, voltage dynamic transients are required to be within a range of ± 5%, with a voltage transient recovery time of 20 ms.

Since the existing single-phase inverter generally does not give U to the effective value_rmsAnd (4) adjusting or only carrying out closed-loop control on the actual effective value of the output voltage calculated by software. When the load of the inverter changes nonlinearly, the effective value of the actual output voltage is calculated and refreshed at least in a power frequency period (20 ms for 50Hz voltage), so that the whole effective value is given to U_rmsThe response time of the adjustment is long, and the time requirement of the transient time of 20ms cannot be basically met.

In order to meet the power supply requirement of precision equipment, a complex hardware circuit is often additionally required, and the cost of the whole machine is greatly increased.

Disclosure of Invention

The embodiment of the invention provides an output voltage control method, an output voltage control system, a single-phase inverter power supply and a storage medium, and aims to solve the technical problems that: the problem of how to improve the dynamic indexes of voltage dynamic transient of the single-phase inverter, shortening the voltage transient recovery time and the like so as to meet the power supply requirement of precision equipment is solved.

The technical solution for solving the above technical problem according to an embodiment of the present invention is to provide an output voltage control method, which is applied to a single-phase inverter power supply, where the single-phase inverter power supply includes an inverter and an inverter controller, and the method includes:

acquiring voltage instantaneous value setting of the inverter and sampling an output voltage instantaneous value of the inverter in real time;

calculating the error between the voltage instantaneous value setting and the output voltage instantaneous value, and acquiring a dynamic adjustment quantity according to the error;

and superposing the dynamic regulating quantity on the voltage effective value given of the inverter to obtain a new inverter voltage effective value given, updating the instantaneous inverter voltage given in real time according to the new inverter voltage effective value given, and controlling the inverter to operate by using the instantaneous inverter voltage given.

As a further improvement of the present invention, the obtaining of the dynamic adjustment amount according to the error includes:

when the error is greater than or equal to a preset dynamic threshold value, determining a dynamic adjustment time length according to the error, wherein the larger the error at the moment of entering the dynamic adjustment, the longer the dynamic adjustment time length;

and calculating the dynamic adjustment quantity in real time through a dynamic adjustment control link in the dynamic adjustment duration.

As a further improvement of the present invention, the method further comprises:

and adjusting the preset dynamic threshold according to the wave-generating phase angle position of the inverter.

As a further improvement of the present invention, the adjusting the preset dynamic threshold according to the inverter wave phase angle position includes:

when the wave-sending phase angle is close to a zero crossing point, setting the preset dynamic threshold value as a first preset value;

and when the wave-sending phase angle is close to the peak point, setting the preset dynamic threshold value as a second preset value, wherein the second preset value is larger than the first preset value.

As a further improvement of the present invention, said obtaining an inverter voltage instantaneous given value according to the new inverter voltage effective value given comprises:

and multiplying the given voltage effective value of the inverter by the sine value of the phase locking angle of the inverter to obtain the given inversion voltage instantaneous value.

As a further improvement of the present invention, the obtaining of the dynamic adjustment amount according to the error includes:

and when the error is smaller than the preset dynamic threshold value, keeping the dynamic adjustment amount unchanged.

The invention also provides an output voltage control system, which is applied to a single-phase inverter power supply, wherein the single-phase inverter power supply comprises an inverter and an inverter controller, the system also comprises a sampling unit, a dynamic adjusting unit and an alternating current given unit, and the output voltage control system comprises:

the sampling unit is used for acquiring voltage instantaneous value setting of the inverter and sampling the output voltage instantaneous value of the inverter in real time;

the dynamic adjusting unit is used for calculating the errors of the voltage instantaneous value setting and the inversion voltage instantaneous value and acquiring a dynamic adjusting quantity according to the errors;

the alternating current given unit is used for superposing the dynamic adjustment quantity and the voltage effective value given of the inverter to obtain a new voltage effective value given, updating the instantaneous inversion voltage given in real time according to the new voltage effective value given, and enabling the inversion controller to control the inverter to operate through the instantaneous inversion voltage given.

As a further improvement of the present invention, when the error is greater than or equal to a preset dynamic threshold, the dynamic adjustment unit determines a dynamic adjustment duration according to the error, and calculates a dynamic adjustment amount in real time through a dynamic adjustment control link within the dynamic adjustment duration;

the larger the error at the moment of entering dynamic adjustment is, the longer the dynamic adjustment time is, and the preset dynamic threshold is determined according to the wave-sending phase angle of the inverter.

The invention also provides a single-phase inverter power supply, which comprises a storage unit and a processing unit, wherein the storage unit stores a computer program which can be executed by the processing unit, and the processing unit realizes the steps of the output voltage control method when executing the computer program.

The invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the output voltage control method as given above.

The output voltage control method, the output voltage control system, the single-phase inverter power supply and the storage medium can adjust the voltage of the inverter in real time according to the output voltage instantaneous value of the inverter, and can greatly improve the response speed of the output voltage of the inverter under the condition of not increasing any hardware circuit.

Drawings

FIG. 1 is a schematic diagram of a prior art single phase inverter output control;

FIG. 2 is a flow chart of an output voltage control method according to an embodiment of the present invention;

fig. 3 is a schematic flow chart illustrating a process of obtaining a dynamic adjustment amount in an output voltage control method according to an embodiment of the present invention;

FIG. 4 is a logic diagram of an output voltage control method according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an output voltage control system provided by an embodiment of the present invention;

fig. 6 is a schematic diagram of a single-phase inverter power supply according to an embodiment of the invention.

Detailed Description

The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.

In the description of the present invention, if an orientation description is referred to, for example, the orientations or positional relationships indicated by "upper", "lower", "front", "rear", "left", "right", etc. are based on the orientations or positional relationships shown in the drawings, only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" to another feature, it can be directly disposed, secured, or connected to the other feature or indirectly disposed, secured, connected, or mounted to the other feature.

In the description of the embodiments of the present invention, if "a number" is referred to, it means one or more, if "a plurality" is referred to, it means two or more, if "greater than", "less than" or "more than" is referred to, it is understood that the number is not included, and if "greater than", "lower" or "inner" is referred to, it is understood that the number is included. If reference is made to "first" or "second", this should be understood to distinguish between features and not to indicate or imply relative importance or to implicitly indicate the number of indicated features or to implicitly indicate the precedence of the indicated features.

Fig. 2 is a schematic flow chart of an output voltage control method according to an embodiment of the present invention, where the output voltage control method is applicable to a single-phase inverter power supply and increases a response speed of an output voltage of the single-phase inverter power supply. The single-phase inverter power supply comprises an inverter and an inverter controller, and the output voltage control method of the embodiment can be executed by the inverter controller of the single-phase inverter power supply or a control device independent of the inverter controller, specifically, the method comprises the following steps:

step S21: the method comprises the steps of acquiring a voltage instantaneous value of an inverter in real time, giving and sampling an output voltage instantaneous value of the inverter in real time.

The instantaneous value of the voltage of the inverter can be obtained by a voltage loop in the inverter controller (for example, the voltage at the input end of a PI regulator in voltage closed-loop control), and the instantaneous value of the output voltage of the inverter can be obtained by sampling the voltage at the output end of the inverter. In conjunction with fig. 4, the voltage instantaneous value of the inverter may be obtained by multiplying the voltage effective value by the sine value of the current phase-locked angle. The voltage effective value can be preset by a system, and can also be obtained by controlling and adjusting the sampling inverter output voltage effective value (for example, the effective value is given to carry out closed-loop control according to the real-time calculation result of the power frequency period).

In one embodiment of the present invention, the voltage setting of the inverter and the output voltage of the inverter may be sampled using the same frequency, and the voltage instantaneous value setting of the inverter and the output voltage instantaneous value of the inverter may be obtained. In practical applications, different frequencies may also be used to sample the inverter voltage setpoint and the inverter output voltage. However, the sampling frequency given by the voltage instantaneous value of the inverter needs to be greater than the adjusting frequency given by the voltage effective value of the inverter, so as to improve the control precision of the output voltage of the inverter.

Step S22: and calculating the error between the voltage instantaneous value setting and the output voltage instantaneous value, and acquiring the dynamic adjustment quantity according to the error.

The error may be a difference between the voltage instantaneous value given and the inverted voltage instantaneous value, and the two values are directly subtracted in the specific implementation. The error is related to the dynamic adjustment amount, i.e. the larger the error at the moment of entering dynamic adjustment, the larger the dynamic adjustment amount. Also, the dynamic adjustment amount may be generated in real time by integral control.

Step S23: and adding the dynamic regulating quantity to the voltage effective value given value to obtain a new voltage effective value given value, then updating the inverter voltage instantaneous value given value in real time according to the new voltage effective value given value (for example, the inverter voltage instantaneous given value is updated by multiplying the new voltage effective value given value by a sine value of an inverter phase-locking angle), and controlling the inverter to operate by using the updated inverter voltage instantaneous given value. Namely, the inverter controller performs closed-loop control on the output voltage according to the updated instantaneous value of the inverter voltage. In addition, the voltage effective value of the superimposed dynamic adjustment amount is also given for other operation control in the inverter controller.

The dynamic adjustment quantity is superposed on the voltage effective value of the inverter, and the voltage effective value can be directly added or subtracted with the dynamic adjustment quantity. The instantaneous value of the voltage of the inverter can then be given by multiplying the new effective value of the voltage by the sine of the current phase-locked angle.

The output voltage control method adjusts the voltage effective value setting of the inverter in real time according to the output voltage instantaneous value of the inverter, and can greatly improve the response speed of the output voltage of the inverter under the condition of not increasing any hardware circuit. In addition, the method does not need to independently increase any voltage or current detection channel, and has low system cost and high reliability.

Taking a single-phase inverter power supply with the capacity of 10K as an example, when the single-phase inverter power supply supplies power for a 9K linear load, if output voltage control is performed in a conventional mode, the instantaneous voltage drop of an suddenly-loaded resistive full load is 13.45%, the voltage transient recovery time is 679ms, the instantaneous voltage overshoot of the suddenly-loaded resistive full load is 8.34%, and the voltage transient recovery time is 371ms, and the change of closed-loop parameters of an inverter controller basically does not improve the dynamic drop and overshoot, even is slightly accelerated.

Under the condition of carrying out power frequency level regulation on a given effective value of alternating current and not carrying out dynamic regulation on the voltage given by an inverter, the instantaneous voltage drop of the sudden resistive full load is 12.94 percent, the voltage transient recovery time is 59ms, the instantaneous voltage overshoot of the sudden resistive full load is 9.67 percent, and the voltage transient recovery time is 55 ms.

On the basis of industrial frequency level adjustment of an alternating current given effective value, when the voltage given by the inverter is dynamically adjusted by using the method of the embodiment of the figure 2, the instantaneous voltage drop of the sudden resistive full load is 4.95%, the voltage transient recovery time is 1ms, the instantaneous voltage overshoot of the sudden resistive full load is 2.67%, and the voltage transient recovery time is 0 ms.

From the experimental situation, the dynamic characteristics of the single-phase inverter power supply can be obviously improved by dynamically adjusting the voltage setting of the inverter.

In order to avoid frequent adjustment of the voltage setting of the inverter due to small fluctuations of the load, the voltage setting of the inverter may be adjusted only when the error exceeds a certain value (i.e., a preset dynamic threshold). Accordingly, as shown in fig. 3, in step S22 of fig. 2, the obtaining the dynamic adjustment amount according to the error specifically includes:

step S221: when the error is larger than or equal to the preset dynamic threshold, the dynamic adjustment time length is determined according to the error, and the error is related to the dynamic adjustment time length, namely the error at the moment of entering the dynamic adjustment is large, and the dynamic adjustment time is long.

Specifically, the preset dynamic threshold is determined according to the wave-sending phase angle of the inverter, and when the wave-sending phase angle is near a zero crossing point, the preset dynamic threshold can be set to a first preset value (the first preset value is relatively small) because the instantaneous value of the output voltage is small; when the wave phase angle is near the peak point, the preset dynamic threshold value can be set to be the first preset value (the second preset value is relatively larger and is larger than the first preset value) because the instantaneous value of the output voltage is large.

Step S222: and calculating the dynamic adjustment quantity in real time through a dynamic adjustment control link in the dynamic adjustment duration. And in the dynamic adjustment time length, calculating the dynamic adjustment quantity in real time through integral control according to the real-time value of the error until the error is in a certain range.

Specifically, the dynamic adjustment amount can be realized by integral control ^ Δ U × Kidt. The direction of the dynamic regulating quantity can be obtained by comparing the given absolute value of the instantaneous value of the voltage with the absolute value of the instantaneous value of the output voltage, when the given absolute value of the instantaneous value of the voltage is larger than the absolute value of the instantaneous value of the output voltage, the dynamic regulating quantity is positive, otherwise, the dynamic regulating quantity is negative.

In particular, when the error is smaller than the preset dynamic threshold, the voltage setting of the inverter is not dynamically adjusted, for example, the dynamic adjustment amount in step S22 is directly kept unchanged, so as to avoid frequent adjustment of the voltage setting of the inverter caused by small fluctuation of the load.

As shown in fig. 5, the present invention also provides an output voltage control system, which can be applied to a single-phase inverter power supply, and the single-phase inverter power supply includes an inverter 51 and an inverter controller (not shown in the figure). The output voltage control system of the present invention further includes a sampling unit 52, a dynamic adjustment unit 53, and an ac setting unit 54. The sampling unit 52, the dynamic adjustment unit 53 and the ac given unit 54 may be implemented by one or more Micro Control Units (MCUs) in combination with corresponding software. Wherein:

the sampling unit 52 is used for acquiring the voltage instantaneous value of the inverter and sampling the output voltage instantaneous value of the inverter in real time. In one embodiment of the present invention, the sampling unit 52 may sample the inverter voltage given and the inverter output voltage using the same frequency. In practical applications, the sampling unit 52 may also use different frequencies to sample the inverter voltage setting and the inverter output voltage. However, the sampling frequency given by the voltage instantaneous value of the inverter needs to be greater than the adjusting frequency given by the voltage effective value of the inverter, so as to improve the control precision of the output voltage of the inverter.

The dynamic regulation unit 53 is used to calculate the instantaneous value of the voltage given U_refAnd the instantaneous value U of the inverted voltage_invAnd obtaining a dynamic adjustment U according to the error_adj. The error may be a difference between the voltage instantaneous value given and the inverted voltage instantaneous value, and the two values are directly subtracted in the specific implementation. Error and dynamic adjustment U_adjCorrelation, i.e. the greater the error at the moment of entry into the dynamic adjustment, the greater the dynamic adjustment quantity U_adjThe larger. And, dynamically adjust the amount U_adjCan be generated in real time by integral control.

The AC given unit 54 is used for dynamically adjusting the quantity U_adjGiven U with voltage effective value_rmsSuperposing to obtain a new effective voltage value, multiplying the new effective voltage value by the sine value of the phase-locked angle of the inverter to obtain the instantaneous given U of the inverter voltage_refAnd instantaneously giving U by using the inverted voltage_refThe inverter operation is controlled for voltage setting, namely the output voltage of the inverter is subjected to closed-loop control.

In an embodiment of the present invention, the dynamic adjustment unit 53 determines the dynamic adjustment time length according to the error when the error is greater than or equal to the preset dynamic threshold, and calculates the dynamic adjustment amount in real time through the dynamic adjustment control link within the dynamic adjustment time length. The error is related to the dynamic adjustment time length, and the preset dynamic threshold is determined according to the wave-sending phase angle of the inverter. When the error is smaller than the preset dynamic threshold, the dynamic adjusting unit 53 directly skips, and keeps the dynamic adjusting amount unchanged, so that the alternating current given unit does not adjust the voltage given to the inverter controller.

The output voltage control system in this embodiment is the same as the output voltage control method in the embodiment corresponding to fig. 2 to 3, and the specific implementation process thereof is described in detail in the corresponding method embodiment, and the technical features in the method embodiment are correspondingly applicable in this system embodiment, which is not described herein again.

As shown in fig. 6, the single-phase inverter power supply 6 includes a storage unit 61 and a processing unit 62, where the storage unit 61 stores therein a computer program executable by the processing unit 62, and the processing unit 62 implements the steps of the output voltage control method when executing the computer program.

The single-phase inverter power supply 5 in this embodiment is the same as the output voltage control method in the embodiment corresponding to fig. 2 to 3, and specific implementation processes thereof are described in detail in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable to the single-phase inverter power supply embodiment, which is not described herein again.

The embodiment of the invention also provides a storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the output voltage control method are realized.

The storage medium in this embodiment and the output voltage control method in the embodiment corresponding to fig. 2 to 3 belong to the same concept, and specific implementation processes thereof are detailed in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in the storage medium embodiments, and are not described herein again.

It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It is obvious to those skilled in the art that, for convenience and simplicity of description, the foregoing functional units and modules are merely illustrated in terms of division, and in practical applications, the foregoing functions may be distributed as needed by different functional units and modules. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of 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 processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

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 implementation. 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 application.

In the embodiments provided in the present application, it should be understood that the disclosed output voltage control method, system and single-phase inverter power supply may be implemented in other manners. For example, the output voltage control system embodiments described above are merely illustrative.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any physical or interface switching device, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signal, telecommunication signal, software distribution medium, etc., capable of carrying said computer program code. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.