CN-122001260-A - Control method and system for driving device of air conditioner compressor of silicon carbide device

CN122001260ACN 122001260 ACN122001260 ACN 122001260ACN-122001260-A

Abstract

The invention belongs to the technical field of power electronics, and relates to a control method and a control system of a driving device of an air conditioner compressor of a silicon carbide device, wherein the method comprises the steps of carrying out two-phase stationary coordinate transformation on three-phase power grid voltage and three-phase power grid current, and carrying out phase locking treatment on the power grid voltage to obtain a power grid voltage angle signal; the method comprises the steps of carrying out rotating coordinate transformation on power grid voltage and power grid current according to voltage angle signals, generating two-phase linear signals according to actual direct-current bus voltage, dq-axis power grid voltage and dq-axis power grid current, carrying out three-phase static coordinate transformation on the two-phase linear signals based on the power grid voltage angle signals and the actual direct-current bus voltage to obtain three-phase modulation signals of a grid-side driving converter, and generating driving signals of the grid-side driving converter and a compressor-side driving converter according to the modulation signals of the grid-side driving converter and the compressor-side driving converter and four different carrier signals. The invention has high control precision and can improve the efficiency, reliability and suitability of the air conditioner compressor driving device.

Inventors

ZHAO RENDE
YAN QINGZENG
HE JINKUI
XU HAILIANG
MA WENZHONG
ZHANG LONGLONG
SUN BAIQIANG

Assignees

中国石油大学(华东)

Dates

Publication Date: 20260508
Application Date: 20260410

Claims (9)

1. The control method of the driving device of the air conditioner compressor of the silicon carbide device is characterized by comprising the following specific steps: transforming the three-phase power grid voltage and three-phase power grid current into power grid voltage and power grid current under a two-phase stationary coordinate system; The voltage phase locking step is to carry out phase locking processing on the power grid voltage under the two-phase static coordinate system to obtain a power grid voltage angle signal; A rotating coordinate transformation step, namely transforming the power grid voltage and the power grid current under the two-phase static coordinate system into the power grid voltage and the power grid current under the two-phase rotating coordinate system according to the voltage angle signal; The linear signal generating step is to perform PI control according to the actual DC bus voltage, the power grid voltage and the power grid current under the two-phase rotating coordinate system to generate two-phase linear signals; the grid side modulation signal generation step is that based on the angle signal of the power grid voltage and the actual DC bus voltage, the three-phase stationary coordinate transformation is carried out on the two-phase linear signal to obtain the three-phase modulation signal of the grid side driving converter; setting four isosceles triangle carrier signals with the same frequency and different amplitude ranges as carrier signals, and setting three-phase modulation signals of a compressor side driving converter; And the driving signal generation step is used for generating i-phase rectification driving signals of the grid-side driving converter according to the i-phase modulation signals of the grid-side driving converter and the four carrier signals, wherein i=a, b and c, and generating i-phase inversion driving signals of the compressor-side driving converter according to the i-phase modulation signals of the compressor-side driving converter and the four carrier signals.
2. The method for controlling a driving device of an air conditioner compressor with silicon carbide devices according to claim 1, wherein in the stationary coordinate transformation, the method for transforming the three-phase grid voltage into the grid voltage in the two-phase stationary coordinate system is as follows: The power grid voltage U α is obtained by multiplying the power grid voltage U a of the a phase by the power grid voltage U b of the b phase by the first set coefficient and multiplying the power grid voltage U c of the c phase by the first set coefficient; Multiplying the b-phase power grid voltage U b by a third set coefficient and multiplying the c-phase power grid voltage U c by the third set coefficient to obtain a power grid voltage U β by the second set coefficient; The method for converting the three-phase power grid current into the power grid current under the two-phase static coordinate system comprises the following steps: Multiplying a-phase power grid current I a by b-phase power grid current I b by a first set coefficient, multiplying c-phase power grid current I c by the first set coefficient, and multiplying the first set coefficient by a second set coefficient to obtain power grid current I α ; And multiplying the b-phase power grid current I b by the third set coefficient and multiplying the c-phase power grid current I c by the third set coefficient to obtain the power grid current I β by the second set coefficient.
3. The method for controlling a driving device of an air conditioner compressor with silicon carbide devices according to claim 2, wherein in the step of voltage phase locking, the method for obtaining a power grid voltage angle signal by performing phase locking processing on the power grid voltage in a two-phase stationary coordinate system comprises the following steps: The square of the grid voltage U α and the square of the grid voltage U β are added and then are squared to obtain a first intermediate value; Grid voltage U α divided by the first intermediate value grid voltage angle signal sin theta and grid voltage U β divided by the first intermediate value grid voltage angle signal cos theta are grid voltage angles.
4. The method for controlling an air conditioner compressor driving device of a silicon carbide device according to claim 3, wherein in the rotating coordinate transforming step, the method for transforming the grid voltage in the two-phase stationary coordinate system into the grid voltage in the two-phase rotating coordinate system according to the voltage angle signal comprises: Adding the power grid voltage U α multiplied by cos theta and the power grid voltage U β multiplied by sin theta to obtain d-axis power grid voltage U d under a two-phase rotation coordinate system; The power grid voltage U α multiplied by sin theta multiplied by a fourth set coefficient is added with the power grid voltage U β multiplied by cos theta to obtain q-axis power grid voltage U q under a two-phase rotating coordinate system; The method for converting the power grid current under the two-phase static coordinate system into the power grid current under the two-phase rotating coordinate system according to the voltage angle signal comprises the following steps: Adding the power grid current I α multiplied by cos theta and the power grid current I β multiplied by sin theta to obtain d-axis power grid current I d under a two-phase rotating coordinate system; And adding the power grid current I α multiplied by sin theta multiplied by a fourth set coefficient and the power grid current I β multiplied by cos theta to obtain q-axis power grid current I q under a two-phase rotating coordinate system.
5. The method of controlling a driving apparatus of an air conditioner compressor with silicon carbide devices according to claim 4, wherein in the linear signal generating step, the method of generating a two-phase linear signal is as follows: Setting an expected direct current bus voltage U dc ' , obtaining a first intermediate value by PI control on the difference value of the expected direct current bus voltage U dc ' and the actual direct current bus voltage U dc , obtaining a second intermediate value by PI control on the negative value of the first intermediate value and the error value of d-axis power grid current I d , and obtaining a d-axis linear signal x d by adding the second intermediate value and d-axis power grid voltage U d ; Setting a q-axis expected grid current I q ' , performing PI control on a difference value of the q-axis expected grid current I q ' and the q-axis grid current I q to obtain a third intermediate value, and adding the third intermediate value and the q-axis grid voltage U q to obtain a q-axis linear signal x q .
6. The method for controlling a driving device of an air conditioner compressor with silicon carbide devices according to claim 5, wherein in the step of generating a net side modulation signal, the method for obtaining a three-phase modulation signal of a net side driving converter by three-phase stationary coordinate transformation comprises the steps of: The d-axis linear signal x d is multiplied by a fifth set coefficient and then divided by the actual direct current bus voltage U dc to obtain a linear signal x d ' , and the q-axis linear signal x q is multiplied by the fifth set coefficient and then divided by the actual direct current bus voltage U dc to obtain a linear signal x q ' ; Subtracting the product of the linear signal x d ' multiplied by cos theta from the product of the linear signal x q ' multiplied by sin theta to obtain an a-phase modulation signal x a of the network side driving converter; Multiplying sin theta by a third setting coefficient and cos theta by a first setting coefficient, multiplying the third setting coefficient and cos theta by a linear signal x d ' to obtain a first signal x 1 , multiplying sin theta by the first setting coefficient and cos theta by the third setting coefficient, multiplying the third setting coefficient and sin theta by a linear signal x q ' to obtain a second signal x 2 , and adding the second signal x 2 to the first signal x 1 to obtain a b-phase modulation signal x b of the grid-side driving converter; The third signal x 3 is obtained by multiplying cos theta by the first setting coefficient minus sin theta and then multiplying the third setting coefficient by the linear signal x d ' , the fourth signal x 4 is obtained by multiplying sin theta by the sixth setting coefficient minus cos theta and then multiplying the third setting coefficient by the linear signal x q ' , and the c-phase modulation signal x c of the grid-side driving converter is obtained by adding the fourth signal x 4 to the third signal x 3 .
7. The method for controlling a driving apparatus of an air conditioner compressor with silicon carbide devices according to claim 6, wherein in the driving signal generating step, the method for generating the i-phase rectifying driving signal of the grid-side driving inverter comprises: Judging whether an i-phase modulation signal x i of the network side driving converter is greater than or equal to 0, if so, obtaining a first laminated carrier signal x i1 as a first carrier signal carrier1 and a second laminated carrier signal x i2 as a second carrier signal carrier2, and if not, obtaining a first laminated carrier signal x i1 as a third carrier signal carrier3 and a second laminated carrier signal x i2 as a fourth carrier signal carrier4; Multiplying the i-phase modulation signal x i of the network side driving converter by-0.5 after the i-phase modulation signal x i is subjected to a SIGN function, and adding the i-phase modulation signal x i of the network side driving converter to obtain a modulation signal x i ' ; Judging whether an i-phase modulation signal x i of the network side driving converter is larger than or equal to a first laminated carrier signal x i1 , if so, obtaining a driving signal PWMXi1 as a high level, otherwise, obtaining a driving signal PWMXi as a low level; judging whether an i-phase modulation signal x i of the network side driving converter is smaller than or equal to a second laminated carrier signal x i2 , if yes, obtaining a driving signal PWMXi as a high level, otherwise, obtaining a driving signal PWMXi as a low level; Judging whether an i-phase modulation signal x i of the network side driving converter is larger than or equal to 0, if so, obtaining a driving signal PWMXi to be high level and a driving signal PWMXi to be low level, otherwise, obtaining a driving signal PWMXi to be low level and a driving signal PWMXi to be high level; Judging whether the modulation signal x i ' is greater than or equal to 0, if so, obtaining a driving signal PWMXi and a driving signal PWMXi which are inversion signals of the driving signal PWMXi1, otherwise, obtaining a driving signal PWMXi and a driving signal PWMXi which are inversion signals of the driving signal PWMXi 2.
8. The method of controlling a driving apparatus of a silicon carbide device air conditioner compressor according to claim 6, wherein in the driving signal generating step, the method of generating an i-phase inversion driving signal of the compressor-side driving inverter comprises: Judging whether an i-phase modulation signal y i of the compressor-side driving converter is greater than or equal to 0, if so, obtaining a third laminated carrier signal y i1 as a first carrier signal carrier1 and a fourth laminated carrier signal y i2 as a second carrier signal carrier2, and if not, obtaining a third laminated carrier signal y i1 as a third carrier signal carrier3 and a fourth laminated carrier signal y i2 as a fourth carrier signal carrier4; Multiplying the i-phase modulation signal y i of the compressor side driving converter by-0.5 after the i-phase modulation signal y i is subjected to a SIGN function, and adding the i-phase modulation signal y i of the compressor side driving converter to obtain a modulation signal y i ' ; Judging whether an i-phase modulation signal y i of the compressor side driving converter is larger than or equal to a third superimposed carrier signal y i1 , if so, obtaining a driving signal PWMYi1 as a high level, otherwise, obtaining a driving signal PWMYi as a low level; Judging whether an i-phase modulation signal y i of the compressor-side driving converter is smaller than or equal to a fourth laminated carrier signal y i2 , if yes, obtaining a driving signal PWMYi to be high level, otherwise, obtaining a driving signal PWMYi to be low level; Judging whether an i-phase modulation signal y i of the compressor-side driving converter is greater than or equal to 0, if so, obtaining a driving signal PWMYi to be high level and a driving signal PWMYi to be low level, otherwise, obtaining a driving signal PWMYi to be low level and a driving signal PWMYi to be high level; Judging whether the modulation signal y i ' is greater than or equal to 0, if so, obtaining a driving signal PWMYi and a driving signal PWMYi6 as inverting signals of the driving signal PWMYi1, otherwise, obtaining a driving signal PWMYi5 and a driving signal PWMYi as inverting signals of the driving signal PWMYi 2.
9. A silicon carbide device air conditioner compressor driving device control system for implementing the silicon carbide device air conditioner compressor driving device control method according to any one of claims 1 to 8, comprising: the acquisition module is used for acquiring three-phase power grid voltage, three-phase power grid current and actual direct current bus voltage; The static coordinate transformation module is used for transforming the three-phase power grid voltage and the three-phase power grid current into the power grid voltage and the power grid current under a two-phase static coordinate system; the voltage phase locking module is used for carrying out phase locking processing on the power grid voltage under the two-phase static coordinate system to obtain a power grid voltage angle signal; the rotating coordinate transformation module is used for transforming the power grid voltage and the power grid current under the two-phase static coordinate system into the power grid voltage and the power grid current under the two-phase rotating coordinate system according to the voltage angle signals; The linear signal generation module is used for performing PI control according to the actual direct-current bus voltage, the power grid voltage and the power grid current under the two-phase rotating coordinate system to generate two-phase linear signals; The grid-side modulation signal generation module is used for carrying out three-phase stationary coordinate transformation on the two-phase linear signals based on the power grid voltage angle signals and the actual direct current bus voltage to obtain three-phase modulation signals of the grid-side driving converter; the setting module is used for setting four isosceles triangle carrier signals with the same frequency and different amplitude ranges as carrier signals and setting three-phase modulation signals of the compressor side driving converter; The driving signal generating module is used for generating i-phase rectification driving signals of the grid-side driving converter according to the i-phase modulation signals of the grid-side driving converter and the four carrier signals, i=a, b and c, and generating i-phase inversion driving signals of the compressor-side driving converter according to the i-phase modulation signals of the compressor-side driving converter and the four carrier signals.

Description

Control method and system for driving device of air conditioner compressor of silicon carbide device Technical Field The invention belongs to the technical field of power electronics, relates to an air conditioner compressor control technology, and particularly relates to a control method and a control system for a silicon carbide device air conditioner compressor driving device. Background The driving converter of the air conditioner compressor is a core power control unit of the variable-frequency air conditioner system, and has the core function of converting power frequency alternating current input by a power grid through rectification and inversion to output alternating current with adjustable frequency and voltage, so that the variable-frequency air conditioner compressor is driven to adjust the running state according to the actual refrigerating/heating requirements. Compared with the traditional fixed-frequency air conditioner, the variable-frequency air conditioner with the driving converter can be controlled through accurate frequency, so that the compressor can be kept running at a low speed under a low-load working condition, frequent switching between shutdown and full-load operation of the compressor is avoided, the energy consumption of the whole machine can be greatly reduced, the startup and shutdown frequency of the compressor can be effectively reduced, the temperature control precision and the operation silence of the air conditioner are improved, and the variable-frequency air conditioner is a key core component for realizing efficient, stable and comfortable operation. At present, a power switching device and a rectifying device of an air conditioner compressor driving converter are mainly an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, for short, an IGBT) and a Silicon-based Schottky diode which are prepared based on Silicon (Si) materials. Through long-term technical iteration, the performance of the silicon-based power device gradually approaches the theoretical limit of the material, and breakthrough promotion is difficult to realize on key indexes such as switching loss, high temperature resistance, pressure resistance level and the like, so that the requirement of the variable frequency air conditioner on development towards the adaptability of higher energy efficiency, smaller volume and wider working condition cannot be met. In recent years, silicon Carbide (SiC) power semiconductor devices are outstanding by virtue of excellent material characteristics, and are becoming an upgrade alternative for power devices in high-efficiency fields such as new energy, industrial control and the like. Compared with the traditional silicon-based IGBT, the SiC Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) has the advantages of high switching speed, low switching loss, excellent high temperature resistance and the like, and compared with the silicon-based Schottky diode, the SiC Schottky diode also has higher voltage withstand level and lower reverse recovery loss. The SiC MOSFET and the silicon carbide Schottky diode are applied to the driving converter of the air conditioner compressor, and the energy conversion efficiency and the operation stability of the converter are expected to be obviously improved. However, the ultra-high switching speed of SiC MOSFETs also presents new technical challenges. Under the circuit topology and control strategy of the traditional air conditioner driving converter, the direct application of the SiC MOSFET can generate extremely high voltage change rate (dv/dt) and current change rate (di/dt) in the circuit. The problems of overvoltage spike, current rush and the like are extremely easy to cause due to the influence of non-ideal factors such as parasitic capacitance, parasitic inductance and the like in the circuit, and the direct short circuit of an inverter bridge arm can be caused when the problems are serious, so that the operation reliability of the driving converter of the air conditioner compressor is greatly reduced, and the large-scale application of the silicon carbide power device in the field of air conditioners is restricted. Disclosure of Invention The invention aims at the problems of low reliability and the like in the prior art, and provides a control method and a control system for a silicon carbide device air conditioner compressor driving device, which have high control precision and can improve the efficiency, reliability and suitability of the air conditioner compressor driving device. The invention provides a control method of a driving device of a silicon carbide device air conditioner compressor, which comprises the following specific steps: transforming the three-phase power grid voltage and three-phase power grid current into power grid voltage and power grid current under a two-phase stationary coordinate system; The voltage phase locking step is to carry out phase locking processing on the po