CN-121984343-A - Dead zone compensation method, device, equipment, medium and product of energy storage converter

CN121984343ACN 121984343 ACN121984343 ACN 121984343ACN-121984343-A

Abstract

The application provides a dead zone compensation method, a dead zone compensation device, dead zone compensation equipment, dead zone compensation media and dead zone compensation products for an energy storage converter, and relates to the technical field of energy storage systems. The method comprises the steps of determining intervals of all phase currents according to three-phase output currents collected by a current sensor, dynamically calculating basic dead zone compensation quantity by combining a preset linear function, avoiding overcompensation or undercompensation caused by the fact that the existing fixed compensation quantity method does not consider difference of different current sizes on compensation requirements, determining compensation directions by obtaining instantaneous values of all phase modulation waves to obtain target dead zone compensation quantities, ensuring accurate matching of the compensation directions and expected output voltage directions, and generating corrected modulation waves by superposing the target dead zone compensation quantities and original modulation waves, further generating pulse width modulation signals driven by a switching tube, and capable of effectively counteracting pulse width modulation waveform differences caused by dead zone time, reducing output current harmonic waves of an energy storage converter and guaranteeing stable and reliable operation of the energy storage converter and the whole energy storage system.

Inventors

FAN WANQIU
DONG FANG
XIE SHUHONG
JIAO NANA
ZHU DAN
Zeng Kesheng
ZHANG WENHUA

Assignees

江苏中天电源技术有限公司

Dates

Publication Date: 20260505
Application Date: 20260127

Claims (10)

1. The dead zone compensation method for the energy storage converter is characterized by comprising three-phase inversion bridge arms and a current sensor for collecting three-phase output currents, and comprises the following steps: According to the three-phase output current collected by the current sensor, determining a current interval in which each phase of current is located; Determining the basic dead zone compensation quantity of each phase by using a preset linear function based on the current interval where the current of each phase is located, wherein parameters of the preset linear function are set according to dead zone time and are obtained through experimental data fitting; Acquiring instantaneous values of each phase of modulated waves, and determining the compensation direction of the basic dead zone compensation quantity of each phase according to the instantaneous values of each phase of modulated waves so as to obtain target dead zone compensation quantity of each phase; superposing the target dead zone compensation quantity of each phase with the corresponding original modulation wave respectively to obtain corrected modulation waves; and generating pulse width modulation signals for driving the switching tubes in the three-phase inversion bridge arm based on the corrected modulation waves.
2. The method according to claim 1, wherein determining a current interval in which each phase current is located according to the three-phase output current collected by the current sensor comprises: Acquiring an effective value of the three-phase output current acquired by the current sensor; And judging the current interval where each phase of current is based on the effective value of each phase of output current.
3. The method of claim 1, wherein the predetermined linear function comprises a compensation gain value and a constant term, and wherein the parameter fitting process of the predetermined linear function comprises: setting a plurality of groups of experimental working conditions according to the preset dead time, the switching tube characteristics and the system switching frequency of the energy storage converter; Under each group of experimental working conditions, recording dead zone compensation amounts corresponding to different current intervals; And obtaining a compensation gain value and a constant term in the preset linear function through a linear fitting algorithm based on the different current intervals and the corresponding dead zone compensation quantity.
4. The method according to claim 1, wherein said determining a compensation direction of the basic dead-zone compensation amount of each phase from the instantaneous value of each phase modulated wave comprises: Determining that a compensation direction of the basic dead zone compensation amount of any phase is positive in a case where the instantaneous value of any phase modulation wave is greater than zero; In the case where the instantaneous value of any one phase modulated wave is smaller than zero, it is determined that the compensation direction of the basic dead zone compensation amount of any one phase is negative.
5. The method according to claim 1, wherein the superimposing the target dead zone compensation amounts of the respective phases with the corresponding original modulated waves to obtain corrected modulated waves, respectively, includes: performing duty ratio conversion on the target dead zone compensation quantity of each phase to obtain each corresponding duty ratio adjustment quantity; Algebraic superposition is carried out on the duty ratio adjustment quantity of each phase and the original modulation wave instantaneous value of the corresponding phase, so as to generate the corrected modulation wave.
6. The method of any one of claims 1-5, wherein after generating pulse width modulated signals for driving each switching tube in the three-phase inverter leg based on the corrected modulated wave, further comprising: logic verification is carried out on the pulse width modulation signals so as to determine whether each complementary conduction switching tube driving signal has a straight-through risk or not; and under the condition that the direct risk does not exist in each complementarily conducted switching tube driving signal, transmitting a pulse width modulation signal to the switching tube driving circuit so as to control the on-off of the switching tube in the three-phase inversion bridge arm.
7. A dead zone compensation device for an energy storage converter, comprising: The current interval determining module is used for determining the current interval where each phase of current is located according to the three-phase output current acquired by the current sensor; The basic dead zone compensation quantity determining module is used for determining the basic dead zone compensation quantity of each phase by utilizing a preset linear function based on the current interval where the current of each phase is located, wherein parameters of the preset linear function are set according to dead zone time and are obtained through experimental data fitting; The target dead zone compensation quantity determining module is used for obtaining the instantaneous value of each phase of modulation wave, and determining the compensation direction of the basic dead zone compensation quantity of each phase according to the instantaneous value of each phase of modulation wave so as to obtain the target dead zone compensation quantity of each phase; The modulation wave determining module is used for respectively superposing the target dead zone compensation quantity of each phase with the corresponding original modulation wave to obtain corrected modulation waves; and the signal generation module is used for generating pulse width modulation signals for driving the switching tubes in the three-phase inversion bridge arm based on the corrected modulation waves.
8. An electronic device comprising a processor and a memory communicatively coupled to the processor; the memory stores computer-executable instructions; the processor executes computer-executable instructions stored in the memory to implement the method of any one of claims 1-6.
9. A computer readable storage medium having stored therein computer executable instructions which when executed by a processor are adapted to carry out the method of any one of claims 1-6.
10. A computer program product comprising a computer program which, when executed by a processor, implements the method of any of claims 1-6.

Description

Dead zone compensation method, device, equipment, medium and product of energy storage converter Technical Field The application relates to the technical field of energy storage systems, in particular to a dead zone compensation method, a dead zone compensation device, dead zone compensation equipment, dead zone compensation media and dead zone compensation products of an energy storage converter. Background At present, in the power electronic application fields of new energy power generation, energy storage systems and the like, an energy storage converter is an important device for realizing electric energy conversion and transmission, and the output electric energy quality of the energy storage converter directly influences the stability and reliability of the whole system. The three-phase inversion bridge arm of the energy storage converter usually adopts a complementary conduction switching tube structure, and in order to avoid the direct short circuit fault caused by factors such as switch delay, gate drive response lag and the like in the switching process of the switching tubes of the upper bridge arm and the lower bridge arm, dead time is required to be set in a pulse width modulation signal, so that the next switching tube is conducted after the last switching tube is completely closed. However, the symmetry of an ideal pulse width modulation waveform can be damaged due to the introduction of dead time, so that the actual output voltage of the energy storage converter deviates from a theoretical value, further, the waveform distortion of the output current is aggravated, the total harmonic distortion rate is increased, the electric energy quality is seriously affected, and in addition, the control precision of the energy storage converter can be reduced due to the voltage error caused by the dead time, the regulation performance of the energy storage converter on active power and reactive power is affected, and the high-precision electric energy conversion requirement cannot be met. In order to alleviate the adverse effect brought by dead zones, the dead zone compensation method in the prior art adopts a fixed compensation amount to compensate, and does not consider the difference of different current sizes on compensation requirements, so that the problem of overcompensation or undercompensation easily occurs under different load working conditions, and the current dynamic change scene is difficult to adapt. Disclosure of Invention The application provides a dead zone compensation method, a dead zone compensation device, dead zone compensation equipment, dead zone compensation media and dead zone compensation products for an energy storage converter, which are used for solving the problems in the prior art. In a first aspect, the application provides a dead zone compensation method of an energy storage converter, wherein the energy storage converter comprises a three-phase inversion bridge arm and a current sensor for collecting three-phase output current, and the method comprises the following steps: According to the three-phase output current collected by the current sensor, determining a current interval in which each phase of current is located; Determining the basic dead zone compensation quantity of each phase by using a preset linear function based on the current interval where the current of each phase is located, wherein parameters of the preset linear function are set according to dead zone time and are obtained through experimental data fitting; Acquiring instantaneous values of each phase of modulated waves, and determining the compensation direction of the basic dead zone compensation quantity of each phase according to the instantaneous values of each phase of modulated waves so as to obtain target dead zone compensation quantity of each phase; superposing the target dead zone compensation quantity of each phase with the corresponding original modulation wave respectively to obtain corrected modulation waves; and generating pulse width modulation signals for driving the switching tubes in the three-phase inversion bridge arm based on the corrected modulation waves. In one possible design, the determining, according to the three-phase output current collected by the current sensor, a current interval in which each phase current is located includes: Acquiring an effective value of the three-phase output current acquired by the current sensor; And judging the current interval where each phase of current is based on the effective value of each phase of output current. In one possible design, the preset linear function comprises a compensation gain value and a constant term, and the parameter fitting process of the preset linear function comprises the following steps: setting a plurality of groups of experimental working conditions according to the preset dead time, the switching tube characteristics and the system switching frequency of the energy storage converter; Under each group of