WO2023010881A1 - 基于直流母线电压的直流电流估算方法、系统 - Google Patents
基于直流母线电压的直流电流估算方法、系统 Download PDFInfo
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- WO2023010881A1 WO2023010881A1 PCT/CN2022/086241 CN2022086241W WO2023010881A1 WO 2023010881 A1 WO2023010881 A1 WO 2023010881A1 CN 2022086241 W CN2022086241 W CN 2022086241W WO 2023010881 A1 WO2023010881 A1 WO 2023010881A1
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- current
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- 238000000034 method Methods 0.000 title claims abstract description 18
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- 238000004088 simulation Methods 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
Definitions
- the invention relates to the field of motor control, in particular to a DC current estimation method and system based on DC bus voltage.
- the object of the present invention is to provide a DC current estimation method and system based on the DC bus voltage to accurately estimate the DC current.
- the invention discloses a DC current estimation method based on the DC bus voltage, comprising the following steps:
- the step of calculating the AC current related loss power P iacloss (V 0 ) based on the loss power P loss (V 0 ) and the switching loss power P sw (V 0 ) includes:
- P iacloss (V 0 ) P loss (V 0 ) ⁇ P sw (V 0 ), the AC current related loss power P iacloss (V 0 ) is calculated.
- the steps of obtaining the output DC bus voltage V dc and calculating the current switching loss power P' sw (V dc ) include:
- the steps of calculating the current power loss P' loss (V dc ) based on the current switching power loss P' sw (V dc ) and the AC current-related power loss P iacloss (V 0 ) include:
- the current DC power P dc is calculated based on the current loss power P' loss (V dc ) and the current AC power P ac , and then the DC current is calculated according to the DC bus voltage V dc
- the steps include:
- the AC current-related loss power P iacloss (V 0 ) is calculated based on the loss power P loss (V 0 ) and the switching loss power P sw (V 0 ), and the actual DC current is obtained in the actual use environment of the motor and the motor controller.
- Bus voltage V dc , and the steps to calculate the current switching loss power P' sw (V dc ) include:
- V 0 Storage power loss P loss (V 0 ), switching power loss P sw (V 0 ) and AC current related loss power P iacloss (V 0 ), DC bus voltage V 0 , motor torque, speed to a DC voltage-loss table ;
- the steps of calculating the current power loss P' loss (V dc ) based on the current switching power loss P' sw (V dc ) and the AC current-related power loss P iacloss (V 0 ) include:
- the invention also discloses a DC current estimation system based on the DC bus voltage, including an experiment module and a motor applied in an actual use environment, and the motor is connected to a control module;
- the experimental module configuration is:
- the control module is configured as:
- the steps of obtaining the output DC bus voltage V dc and calculating the current switching loss power P' sw (V dc ) include:
- a DC voltage-loss table is also included in the experimental module, and the DC voltage-loss table stores loss power P loss (V 0 ), switching loss power P sw (V 0 ) and AC current-related loss power P iacloss (V 0 ), the DC bus voltage V 0 , the torque and speed of the motor, and the DC voltage-loss table are sent to the control module;
- the control module traverses the DC voltage-loss table according to the torque and speed of the current motor to call the switching loss power P sw (V 0 ) and the AC current-related loss power P iacloss ( V 0 ).
- the correspondence table only needs to store a set of data to calculate the DC current under any DC bus voltage, speeding up the speed of data calling and calculation.
- FIG. 1 is a schematic flowchart of a method for estimating direct current in accordance with a preferred embodiment of the present invention.
- first, second, third, etc. may be used in the present disclosure to describe various information, the information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of the present disclosure, first information may also be called second information, and similarly, second information may also be called first information. Depending on the context, the word “if” as used herein may be interpreted as “at” or “when” or “in response to a determination.”
- connection should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, or two
- connection should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, or two
- connection should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, or two
- the internal communication of each element may be directly connected or indirectly connected through an intermediary.
- intermediary Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations.
- estimating the DC current of the motor based on the data of DC bus voltage includes the following steps:
- the V 0 motor state at any DC bus voltage will be learned first in an experimental environment. That is, simulate or simulate a motor, or obtain a real motor, and output the DC bus voltage V 0 under the simulation of a battery or a battery simulator.
- the value of the DC bus voltage V 0 can be any value.
- the motor controller or the large system composed of the motor and the motor controller system
- the loss power P loss (V 0 ) It is the energy consumed internally when the motor is working.
- the value of the power loss P loss (V 0 ) can be calibrated in the simulation software, or when the motor is a real motor, the power loss P loss (V 0 ) can be calculated according to the calibration of the input power and output power.
- the switching loss power P sw (V 0 ) of the motor controller can be measured by calibrating the power module of the motor controller through methods such as double pulse experiments and data sheets.
- the double-pulse experiment usually consists of DC power supply, bus support capacitor, absorption capacitor, drive circuit, IGBT under test, load inductance, oscilloscope, voltage probe and Rogowski coil.
- the bus voltage can also be adjusted, the size of the inductance and the conduction time can obtain different peak currents.
- the IGBT is turned off, and the current on the inductor continues to flow through the diode of the upper tube. Due to the existence of stray inductance, The current cannot be changed suddenly, and the peak voltage will be caused at the moment of turning off.
- the diode of the upper tube is in the continuous current conduction state. After the second pulse is sent out, the diode of the upper tube reversely recovers, and the current will flow through the lower tube. At the same time, the inductor current continues to rise.
- the power module of the motor will be calibrated to measure its switching loss power P sw (V 0 ), that is, the value of the power loss of the switching components connected to the motor when it is powered on.
- the loss power P loss (V 0 ) under the DC bus voltage V 0 is caused by many factors, the loss power P loss (V 0 ) will be decomposed into the switching loss power P sw (V 0 ), and the AC current-related loss power P iacloss (V 0 ) except the switching loss power P sw (V 0 ). Then, the AC current related loss power P iacloss (V 0 ) is calculated based on the loss power P loss (V 0 ) and the switching loss power P sw (V 0 ).
- the current DC power P dc can be calculated. Or after having the current loss power P' loss (V dc ) and the DC bus voltage V dc , the current efficiency ⁇ MCU (in the preferred mode) can be calculated, and then according to the measured current AC power P ac and DC bus voltage of the motor V dc calculates DC current.
- V d is the d-axis voltage output by the motor controller, and so on.
- the step S300 of calculating the AC current related loss power P iacloss (V 0 ) based on the loss power P loss (V 0 ) and the switching loss power P sw (V 0 ) includes:
- the step S400 of obtaining the output DC bus voltage V dc and calculating the current switching loss power P' sw (V dc ) under the actual use environment of the motor and the motor controller system includes:
- step S410 In the actual use environment of the motor and motor controller system, according to: Calculate the current switching power loss P' sw (V dc ). It can be understood that, in step S410, according to the ratio of the DC bus voltage V dc to the DC bus voltage V 0 in the experimental environment, the current switching loss power P' sw (V dc ) is linearly calculated (here, the current switching loss The change relationship between the power P' sw (V dc ) and the switching loss power P sw (V 0 ) is analogous to the linear change of the DC bus voltage V dc and the DC bus voltage V 0 to save calculation consumption).
- the step S500 of calculating the current loss power P' loss (V dc ) based on the current switching loss power P' sw (V dc ) and the AC current related loss power P iacloss (V 0 ) includes:
- the AC current-related loss power P iacloss (V 0 ) formed by the above collection basically does not change under different DC bus voltages V 0 , so the AC current-related loss power P iacloss (V 0 ) in the experimental environment can be directly applied to Calculate the current power loss P' loss (V dc ).
- the current DC power P ac is calculated based on the current loss power P' loss (V dc ) and the current AC power P ac , and then the DC current is calculated according to the DC bus voltage V dc Step S600 includes:
- the step S300 of calculating the AC current-related loss power P iacloss (V 0 ) based on the loss power P loss (V 0 ) and the switching loss power P sw (V 0 ) is used for motor and motor control
- the step S400 of obtaining the actual DC bus voltage V dc and calculating the current switching loss power P' sw (V dc ) includes:
- S700 Storage loss power P loss (V 0 ), switching loss power P sw (V 0 ) and AC current related loss power P iacloss (V 0 ), DC bus voltage V 0 , motor torque, speed to a DC voltage- loss table. That is to say, in this embodiment, the DC voltage-loss table only needs to store three sets of data, and there is no need to store the MCU efficiency under each DC bus voltage V dc .
- step S500 of calculating the current loss power P' loss (V dc ) based on the current switching loss power P' sw (V dc ) and the AC current related loss power P iacloss (V 0 ) further includes:
- the present invention also provides a DC current estimation system based on the DC bus voltage, including an experiment module and a motor applied in an actual use environment, the motor is connected to a control module;
- the experiment module is configured as follows: in the experiment environment Output a DC bus voltage V 0 of the motor controller, and calibrate the loss power P loss (V 0 ) under the DC bus voltage V 0 ; measure the switching loss power P sw (V 0 ) of the power module of the motor controller; Calculate the AC current related loss power P iacloss (V 0 ) based on the power loss P loss (V 0 ) and the switching loss power P sw (V 0 );
- the configuration of the control module is: in the actual use environment of the motor and the motor controller system, Obtain the actual DC bus voltage V dc , and calculate the current switching power loss P' sw (V dc ); calculate the current power loss based on the current switching power loss P' sw (V dc ) and the
- a DC voltage-loss table is also included in the experimental module, and the DC voltage-loss table stores loss power P loss (V 0 ), switching loss power P sw (V 0 ) and AC current-related loss power P iacloss (V 0 ), DC bus voltage V 0 , motor torque, speed, and the DC voltage-loss table are sent to the control module; the control module traverses the DC voltage-loss table according to the current motor torque and speed to call the DC voltage- The switching loss power P sw (V 0 ) and the alternating current related loss power P iacloss (V 0 ) corresponding to the current torque and speed of the motor in the loss table.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Direct Current Motors (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
Claims (8)
- 一种基于直流母线电压的直流电流估算方法,其特征在于,包括以下步骤:实验环境下输出一电机控制器的直流母线电压V 0,并标定直流母线电压V 0下的损耗功率P loss(V 0);对电机控制器的功率模块标定测量其开关损耗功率P sw(V 0);基于所述损耗功率P loss(V 0)和开关损耗功率P sw(V 0)计算交流电流相关损耗功率P iacloss(V 0);于所述电机及电机控制器系统的实际使用环境下,获得实际直流母线电压V dc,并计算当前开关损耗功率P′ sw(V dc);基于当前开关损耗功率P′ sw(V dc)和交流电流相关损耗功率P iacloss(V 0)计算当前损耗功率P′ loss(V dc);
- 如权利要求1所述的直流电流估算方法,其特征在于,基于所述损耗功率P loss(V 0)和开关损耗功率P sw(V 0)计算交流电流相关损耗功率P iacloss(V 0)的步骤包括:根据:P iacloss(V 0)=P loss(V 0)-P sw(V 0)计算交流电流相关损耗功率P iacloss(V 0)。
- 一种基于直流母线电压的直流电流估算系统,其特征在于,包括实验模块和应用于实际使用环境下的电机,所述电机连接至一控制模块;所述实验模块配置为:于实验环境下输出一电机控制器的直流母线电压V 0,并标定直流母线电压V 0下的损耗功率P loss(V 0);对电机控制器的功率模块标定测量其开关损耗功率P sw(V 0);基于所述损耗功率P loss(V 0)和开关损耗功率P sw(V 0)计算交流电流相关损耗功率P iacloss(V 0);所述控制模块配置为:于所述电机及电机控制器系统的实际使用环境下,获得实际直流母线电压V dc,并计算当前开关损耗功率P′ sw(V dc);基于当前开关损耗功率P′ sw(V dc)和交流电流相关损耗功率P iacloss(V 0)计算当前损耗功率P′ loss(V dc);
- 如权利要求5所述的直流电流估算系统,其特征在于,所述实验模块根据:P iacloss(V 0)=P loss(V 0)-P sw(V 0)计算交流电流相关损耗功率P iacloss(V 0)。
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