CN-121984320-A - Control system and method for dynamically avoiding resonance points of broadband special power supply

CN121984320ACN 121984320 ACN121984320 ACN 121984320ACN-121984320-A

Abstract

The application discloses a control system and a control method for dynamically avoiding resonance points of a broadband special power supply, which relate to the technical field of power supply control, wherein the system comprises the broadband special power supply, a current acquisition unit, a voltage acquisition unit, a virtual impedance compensation module and a voltage control module, wherein the virtual impedance compensation module introduces virtual inductive reactance parameters and virtual capacitive reactance parameters in a control algorithm, and calculating feedback voltage according to the acquired output current, load end voltage and virtual impedance parameters, dynamically adjusting the virtual impedance parameters according to the change direction of the power output frequency and the current frequency value, and comparing the feedback voltage with reference voltage by the voltage control module and adjusting the power output. By introducing virtual impedance parameters into a control algorithm and dynamically adjusting according to the frequency change direction, the frequency deviation of the resonance point is realized, the heating loss of a physical device is avoided, the method can adapt to the working mode of dynamic frequency sweep or frequency adjustment, and the system stability is improved.

Inventors

BAI HONGCHAO
YU JINBIAO
ZHU CHEN
SHI WENWEN
DONG HUINA

Assignees

山东艾诺智能仪器有限公司

Dates

Publication Date: 20260505
Application Date: 20260408

Claims (9)

1. A control system for dynamically avoiding resonance points of a broadband special power supply comprises the broadband special power supply and is characterized by further comprising: the current acquisition unit is used for acquiring the output current of the broadband special power supply ; The voltage acquisition unit is used for acquiring the voltage of the load end ; A virtual impedance compensation module for introducing virtual inductance parameters in the control algorithm And virtual capacitive reactance parameters Combined with the collected output current Load terminal voltage Calculating feedback voltage Dynamically adjusting virtual inductance parameters according to the change direction of the output frequency of the broadband special power supply and the current frequency value And virtual capacitive reactance parameters ; A voltage instantaneous value loop module for feeding back the feedback voltage With reference voltage And comparing and adjusting the output of the broadband special power supply.
2. The broadband special power supply dynamic avoidance resonance point control system according to claim 1, further comprising: A voltage effective value loop module for outputting the reference voltage ; And the current inner loop module is used for receiving the output of the voltage control module and carrying out current regulation.
3. The broadband special power supply dynamic avoidance resonance point control system according to claim 1, wherein the virtual impedance compensation module is configured to control the output current according to the output current And the virtual inductive reactance parameter Virtual capacitive reactance parameters The product of the sum is summed with the load terminal voltage Calculating the feedback voltage: 。
4. The broadband special power supply dynamic avoidance resonance point control system according to claim 1, wherein the voltage transient value loop module comprises an error calculation unit and a PI controller, the error calculation unit is used for calculating an error signal between the feedback voltage and a reference voltage, and the PI controller outputs a control signal according to the error signal.
5. A control method for dynamically avoiding resonance points of a broadband special power supply is characterized by comprising the following steps: collecting the output current of broadband special power supply And load terminal voltage ; Introducing virtual inductive reactance parameters in control algorithm And virtual capacitive reactance parameters ; Based on the acquired output current The load terminal voltage The virtual inductive reactance parameter And the virtual capacitive reactance parameter Calculating feedback voltage ; Judging the change direction of the output frequency of the broadband special power supply; Dynamically adjusting the virtual inductive reactance parameter according to the change direction of the output frequency and the current frequency value And the virtual capacitive reactance parameter The system resonant frequency is far away from the current output frequency; The feedback voltage is set With reference voltage And comparing and adjusting the output of the broadband special power supply.
6. The method for dynamically avoiding resonance point control of a broadband special power supply according to claim 5, wherein the dynamically adjusting the virtual inductive reactance parameter And the virtual capacitive reactance parameter The method comprises the following steps: when the change direction of the output frequency is frequency increase, when the current frequency value f is smaller than the preset lower limit frequency When the virtual inductive reactance parameter is set Setting the virtual capacitive reactance to a first inductive reactance value and setting the virtual capacitive reactance parameter Setting a first capacitance value, and setting the virtual inductance parameter when the current frequency value is greater than or equal to the preset lower limit frequency Setting the virtual capacitive reactance to a second inductive reactance value and setting the virtual capacitive reactance parameter Setting the virtual inductance parameter as a second capacitance value, and when the current frequency value is larger than the preset upper limit frequency And the virtual capacitive reactance parameter Gradually adjusting to the first inductance value and the first capacitance value; When the change direction of the output frequency is frequency reduction, when the current frequency value is larger than the preset upper limit frequency When the virtual inductive reactance parameter is set Setting the virtual capacitive reactance parameter to the first inductive reactance value Setting the virtual inductance parameter as the first capacitance value, and setting the virtual inductance parameter when the current frequency value is smaller than the preset upper limit frequency And the virtual capacitive reactance parameter Setting to zero, and when the current frequency value is smaller than the preset lower limit frequency, setting the virtual inductive reactance parameter And the virtual capacitive reactance parameter Gradually adjusting to the first inductance value and the first capacitance value.
7. The method for controlling dynamic avoidance of resonance points of a broadband special power supply according to claim 6, wherein the preset lower limit frequency And the preset upper limit frequency Constituting avoidance frequency intervals An upper limit frequency of the avoidance frequency interval Is smaller than the natural resonant frequency formed by the broadband special power supply and the load 。
8. The method for dynamically avoiding resonance point control of a broadband special power supply according to claim 5, wherein the step of adjusting the output of the broadband special power supply is implemented by a PI controller.
9. The method for controlling the dynamic avoidance of resonance points of a broadband special power supply according to claim 5, further comprising the step of generating the reference voltage through a voltage effective value loop and the step of current regulation through a current inner loop.

Description

Control system and method for dynamically avoiding resonance points of broadband special power supply Technical Field The invention relates to the technical field of power supply control, in particular to a broadband special power supply dynamic avoidance resonance point control system and method. Background The broadband special power supply is a power electronic device capable of outputting electric energy in a wider frequency range, and is widely applied to the fields of electromagnetic compatibility testing, power electronic converter testing, special equipment power supply and the like. With the development of power electronics technology, higher requirements are put on the output frequency range, dynamic response and stability of a broadband special power supply. In practical application of the broadband special power supply, parasitic inductance exists in a connecting line between the power supply output end and the load, the load also has equivalent capacitance characteristics, and the parasitic parameters form an LC resonance network. When the output frequency of the power supply is close to the resonant frequency of the LC network, resonance phenomenon can occur, so that the system gain suddenly increases, the phase is delayed in a step-type manner, a serious challenge is brought to the stability of the control system, and the output performance of the power supply is affected. In order to suppress LC resonance phenomenon, conventional solutions generally adopt a method of connecting passive devices (such as resistors, inductors, and capacitors) in series or parallel in an LC circuit to change the impedance characteristics of the system. This method adjusts the resonance characteristics of the system by adding physical devices, which can reduce the resonance peak or change the resonance frequency to some extent. However, the method has two main problems that firstly, a series-in or integrated passive device absorbs resonance peak energy to generate heat, power loss is generated, and system efficiency is reduced, and secondly, a physical device parameter added at one time is fixed, and when the power output frequency changes in a large range or dynamic frequency sweep is performed, a device with the fixed parameter cannot adapt to resonance characteristics of different frequency points, so that resonance suppression effect is poor in certain frequency bands. Patent CN115001254a discloses a method for determining resonance point suitable for dc distribution system, which divides the resonance frequency in the system into three types according to the line impedance interaction relationship between the source converters, and obtains the design boundary of the cut-off frequency of the load converter according to the relationship between the resonance peak and the input impedance of the load converter. The method is mainly used for judging the resonance points and guiding the design of the parameters of the converter, but does not relate to a control method for dynamically avoiding the resonance points, and an effective solution is lacking for an application scene with the output frequency dynamically changing in a large range. Therefore, a new technical scheme is needed, and the resonance point of the broadband special power supply can be dynamically avoided in the process of large-range frequency adjustment or dynamic frequency sweep on the premise of not increasing the power loss of a physical device, so that the stability and the adaptability of the system are improved. Disclosure of Invention The invention aims to provide a control system and a control method for dynamically avoiding resonance points of a broadband special power supply, which are used for solving the problems that heating loss exists at LC resonance points and frequency change cannot be dynamically adapted by using serial-parallel physical passive devices in the prior art, and the stability of the control system is severely challenged due to LC resonance when the broadband special power supply is subjected to large-range frequency adjustment or dynamic frequency sweep. The invention aims to achieve the above purpose by the following technical scheme. A control system for dynamically avoiding resonance points of a broadband special power supply comprises the broadband special power supply and further comprises: the current acquisition unit is used for acquiring the output current of the broadband special power supply ; The voltage acquisition unit is used for acquiring the voltage of the load end; A virtual impedance compensation module for introducing virtual inductance parameters in the control algorithmAnd virtual capacitive reactance parametersCombined with the collected output currentLoad terminal voltageCalculating feedback voltageDynamically adjusting virtual inductance parameters according to the change direction of the output frequency of the broadband special power supply and the current frequency valueAnd virtual capaciti