Inverter power supply system and power supply control method thereof

Abstract

The invention relates to the technical field of inverters, in particular to an inverter power supply system and a power supply control method thereof.The inverter power supply system is characterized in that a detection sampling module is arranged at the power input end of a passive load and used for detecting alternating voltage output by a filter; the control module is in signal connection with the detection sampling module, and the control module obtains the dynamic adjusting quantity according to the alternating voltage detected by the detection sampling module and outputs a valve control signal to the inverter. An output voltage instantaneous value of the inverter is collected through the detection sampling module and transmitted to the control module, the control module compares the output voltage instantaneous value of the inverter with a voltage instantaneous preset value, and the control module outputs a valve control signal to the inverter in real time according to the difference between the output voltage instantaneous value and the voltage instantaneous preset value. And therefore, the control precision of the output voltage of the inverter can be improved, and the precise power supply requirement of precise equipment can be met.

Description

Technical Field

[0001] The present application relates to the technical field of inverters, and in particular to an inverter power supply system and a power supply control method thereof. Background Art

[0002] With the continuous development of the electronic industry and digital circuits, various electronic products with different functions are constantly entering people's lives. Inverter power can convert DC power into AC power and provide various AC power with good quality. The main performance indicator of the inverter is the output voltage regulation accuracy. For equipment with high requirements for voltage dynamic transients and voltage instantaneous recovery time, in order to meet the power supply requirements of precision equipment, it is often necessary to add additional complex hardware circuits, which greatly increases the cost of the equipment. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides an inverter power supply system and a power supply control method thereof, including a regulated DC power supply, an inverter, a filter, a passive load, a detection sampling module, and a control module; the regulated DC power supply is connected to the DC side of the inverter as the input of the inverter; the AC side of the inverter is connected to one end of the filter as the AC output; the other end of the filter is connected to the passive load to power the passive load; the detection sampling module is located at the electrical input end of the passive load and is used to detect the voltage of the AC output; the control module is signal-connected to the detection sampling module, and the control module obtains a dynamic adjustment amount according to the AC voltage detected by the detection sampling module, and outputs a valve control signal to the inverter.

[0004] Preferably, the control module includes a regulating module and an AC setting module, the AC setting module is connected to the regulating module, and the regulating module is connected to the inverter.

[0005] Preferably, the filter is a three-phase LC filter, and the value of LC can be adjusted according to the harmonic signal of the AC output.

[0006] Preferably, a power supply control method, based on the above inverter power supply system, comprises the following steps:

[0007] S1, the detection sampling module obtains the instantaneous value of the output voltage of the inverter in real time, and sends it to the control module, and sets the instantaneous preset value of the voltage in the control module;

[0008] S2, the control module calculates the difference between the instantaneous value of the output voltage and the instantaneous preset value of the voltage, and obtains the dynamic adjustment amount according to the difference;

[0009] S3, the control module superimposes the dynamic adjustment amount on the effective value of the inverter voltage to obtain a new inverter voltage effective value, and updates the inverter voltage instantaneous value in real time according to the new inverter voltage effective value. The control module uses the inverter voltage instantaneous value to control the operation of the inverter.

[0010] Preferably, the regulation module is used to calculate the difference between the instantaneous value of the output voltage and the instantaneous preset value of the voltage, and obtain the dynamic regulation amount according to the difference.

[0011] Preferably, the AC setting module is used to superimpose the dynamic adjustment amount with the effective value of the voltage of the inverter to obtain a new effective value of the voltage, and to update the instantaneous value of the inverter voltage in real time according to the new effective value of the voltage.

[0012] Preferably, in step S2, when the difference between the instantaneous value of the output voltage of the inverter and the instantaneous preset value of the voltage is greater than the preset value, the dynamic adjustment duration is determined according to the difference, and the dynamic adjustment amount is calculated in real time through the dynamic adjustment control link; when the difference is less than the preset value, the dynamic adjustment amount is kept unchanged.

[0013] As can be seen from the above, the following beneficial effects can be obtained by applying the present application: by setting the detection sampling module at the electrical input end of the passive load, it is used to detect the AC voltage output by the filter; the control module is connected to the detection sampling module signal, and the control module obtains the dynamic adjustment amount according to the AC voltage detected by the detection sampling module, and outputs the valve control signal to the inverter. The instantaneous value of the output voltage of the inverter is collected by the detection sampling module and transmitted to the control module. The control module compares the instantaneous value of the output voltage of the inverter with the instantaneous preset value of the voltage. The control module outputs the valve control signal to the inverter in real time according to the difference between the two, thereby improving the control accuracy of the output voltage of the inverter and meeting the precise power supply requirements for precision equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the description of the embodiments of the present application or the prior art are briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0015] Figure 1 A schematic diagram of an inverter power supply system and a power supply control method thereof according to an embodiment of the present application;

[0016] Figure 2 It is a schematic diagram of a power supply control method of an inverter power system according to an embodiment of the present application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] Example

[0019] In order to solve the above technical problems, this embodiment provides an inverter power supply system, such as Figure 1 As shown, it includes a regulated DC power supply, an inverter, a filter, a passive load, a detection sampling module, and a control module; the regulated DC power supply is connected to the DC side of the inverter as the input of the inverter; the AC side of the inverter is connected to one end of the filter as the AC output; the other end of the filter is connected to the passive load to supply power to the passive load; the detection sampling module is located at the electrical input end of the passive load and is used to detect the AC voltage output by the filter; the control module is connected to the detection sampling module signal, and the control module obtains the dynamic adjustment amount according to the AC voltage detected by the detection sampling module, and outputs a valve control signal to the inverter. The instantaneous value of the output voltage of the inverter is collected by the detection sampling module and transmitted to the control module. The control module compares the instantaneous value of the output voltage of the inverter with the instantaneous preset value of the voltage. The control module outputs a valve control signal to the inverter in real time according to the difference between the two, thereby improving the control accuracy of the output voltage of the inverter and meeting the precise power supply requirements for precision equipment.

[0020] Specifically, the control module includes an adjustment module and an AC setting module, wherein the AC setting module is connected to the adjustment module, and the adjustment module is connected to the inverter. The adjustment module is used to calculate the difference between the instantaneous value of the output voltage and the instantaneous preset value of the voltage, and obtain the dynamic adjustment amount according to the difference. The AC setting module is used to superimpose the dynamic adjustment amount with the effective value of the voltage of the inverter to obtain a new effective value of the voltage, and update the instantaneous value of the inverter voltage in real time according to the new effective value of the voltage.

[0021] Furthermore, the filter is a three-phase LC filter, and the LC value can be adjusted according to the harmonic signal of the AC output. The LC filter can adjust its LC value according to the harmonic signal of the output AC voltage and the system THD requirements, expanding the application range of the inverter power supply and the reliability of the power supply quality.

[0022] Furthermore, the present embodiment provides a power supply control method, based on the above inverter power supply system, such as Figure 2 As shown, the following steps are included:

[0023] S1, the detection sampling module obtains the instantaneous value of the output voltage of the inverter in real time, and sends it to the control module, and sets the instantaneous voltage preset value in the control module;

[0024] In this step, the AC side of the inverter is connected to one end of the filter, and the other end of the filter is connected to the passive load to supply power to the passive load. The detection sampling module is located at the electrical input end of the passive load and is used to detect the AC voltage output by the filter. The instantaneous value of the output voltage of the inverter is obtained in real time through the detection sampling module and sent to the control module. At the same time, the instantaneous preset value of the voltage is preset in the control module.

[0025] S2, the control module calculates the difference between the instantaneous value of the output voltage and the instantaneous preset value of the voltage, and obtains the dynamic adjustment amount according to the difference;

[0026] In this step, the control module performs a difference technique between the instantaneous output voltage value and the instantaneous voltage preset value preset in the control module according to the instantaneous output voltage value obtained by the detection sampling module, and obtains the dynamic adjustment amount according to the difference. The dynamic adjustment amount is obtained by comparing the given instantaneous voltage value with the absolute value of the instantaneous output voltage value. When the absolute value of the instantaneous voltage preset value is greater than the absolute value of the instantaneous output voltage value, the dynamic adjustment amount is positive, otherwise the dynamic adjustment amount is negative.

[0027] Specifically, when the difference between the instantaneous value of the inverter's output voltage and the instantaneous preset value of the voltage is greater than the preset range value, the dynamic adjustment duration is determined according to the difference, and the dynamic adjustment amount is calculated in real time through the dynamic adjustment control link; when the difference is less than the preset range value, the dynamic adjustment amount is kept unchanged. Further, when the difference is less than the preset range value, the output voltage of the inverter is not adjusted, thereby avoiding frequent adjustments to the inverter voltage due to small fluctuations in the load.

[0028] S3. The control module superimposes the dynamic adjustment amount on the effective value of the inverter voltage to obtain a new effective value of the inverter voltage, and updates the instantaneous value of the inverter voltage in real time according to the new effective value of the inverter voltage. The control module uses the instantaneous value of the inverter voltage to control the operation of the inverter, thereby monitoring and adjusting the output voltage of the inverter in real time, thereby improving the control accuracy of the output voltage of the inverter and meeting the precise power supply requirements for precision equipment.

[0029] In this step, the adjustment module determines the dynamic adjustment duration according to the difference, and calculates the dynamic adjustment amount in real time through the dynamic adjustment control link within the dynamic adjustment duration. The AC setting module is used to superimpose the dynamic adjustment amount with the voltage effective value to obtain a new voltage effective value, and then multiply the new voltage effective value by the sine value of the inverter phase-locked angle as the instantaneous value of the inverter voltage, and use the instantaneous value of the inverter voltage as the voltage setting to control the inverter operation, that is, to achieve closed-loop control of the inverter output voltage, and to improve the control accuracy of the inverter output voltage by adjusting the inverter output voltage in real time.

[0030] In summary, this solution sets the detection sampling module at the electrical input end of the passive load to detect the AC voltage output by the filter; the control module is connected to the detection sampling module signal, and the control module obtains the dynamic adjustment amount according to the AC voltage detected by the detection sampling module, and outputs the valve control signal to the inverter. The instantaneous value of the inverter's output voltage is collected by the detection sampling module and transmitted to the control module. The control module compares the instantaneous value of the inverter's output voltage with the instantaneous preset value of the voltage. The control module outputs the valve control signal to the inverter in real time according to the difference between the two, thereby improving the control accuracy of the inverter's output voltage and meeting the precise power supply requirements for precision equipment.

[0031] The above-described implementation methods do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-described implementation methods shall be included in the protection scope of the technical solution.

Claims

1. An inverter power supply system, characterized in that: It includes a regulated DC power supply, an inverter, a filter, a passive load, a detection sampling module, and a control module; the regulated DC power supply is connected to the DC side of the inverter as the input of the inverter; the AC side of the inverter is connected to one end of the filter as the AC output; the other end of the filter is connected to the passive load to supply power to the passive load; the detection sampling module is located at the electrical input end of the passive load and is used to detect the AC voltage and harmonic wave signals output by the filter; the control module is signal-connected to the detection sampling module, and the control module obtains the dynamic adjustment amount according to the AC voltage detected by the detection sampling module, and outputs a valve control signal to the inverter.

2. The inverter power supply system according to claim 1, characterized in that: The control module includes an adjustment module and an AC setting module, the AC setting module is connected to the adjustment module, and the adjustment module is connected to the inverter.

3. The inverter power supply system according to claim 1, characterized in that: The filter is a three-phase LC filter, and the value of LC can be adjusted according to the harmonic signal of the AC output.

4. A power supply control method, characterized in that: The inverter power supply system according to any one of claims 2 to 3 comprises the following steps: S1, the detection sampling module obtains the instantaneous value of the output voltage of the inverter in real time, and sends it to the control module, and sets the instantaneous preset value of the voltage in the control module; S2, the control module calculates the difference between the instantaneous value of the output voltage and the instantaneous preset value of the voltage, and obtains the dynamic adjustment amount according to the difference; S3, the control module superimposes the dynamic adjustment amount on the effective value of the inverter voltage to obtain a new inverter voltage effective value, and updates the inverter voltage instantaneous value in real time according to the new inverter voltage effective value. The control module uses the inverter voltage instantaneous value to control the operation of the inverter.

5. The power supply control method according to claim 4, characterized in that: The regulating module is used to calculate the difference between the instantaneous value of the output voltage and the instantaneous preset value of the voltage, and obtain the dynamic regulating amount according to the difference.

6. The power supply control method according to claim 4, characterized in that: The AC setting module is used to superimpose the dynamic adjustment amount with the effective value of the voltage of the inverter to obtain a new effective value of the voltage, and to update the instantaneous value of the inverter voltage in real time according to the new effective value of the voltage.

7. The power supply control method according to claim 4, characterized in that: In step S2, when the difference between the instantaneous value of the output voltage of the inverter and the instantaneous preset value of the voltage is greater than the preset range value, the dynamic adjustment duration is determined according to the difference, and the dynamic adjustment amount is calculated in real time through the dynamic adjustment control link; when the difference is less than the preset range value, the dynamic adjustment amount is kept unchanged.

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