WO2016029777A1 - 一种三相开关磁阻电机转矩脉动三电平抑制方法 - Google Patents
一种三相开关磁阻电机转矩脉动三电平抑制方法 Download PDFInfo
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- WO2016029777A1 WO2016029777A1 PCT/CN2015/085651 CN2015085651W WO2016029777A1 WO 2016029777 A1 WO2016029777 A1 WO 2016029777A1 CN 2015085651 W CN2015085651 W CN 2015085651W WO 2016029777 A1 WO2016029777 A1 WO 2016029777A1
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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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/08—Reluctance motors
- H02P25/098—Arrangements for reducing torque ripple
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/10—Arrangements for controlling torque ripple, e.g. providing reduced torque ripple
Definitions
- the invention relates to a three-level suppression method for torque ripple of a switched reluctance motor, which is especially suitable for a three-phase switched reluctance motor drive system.
- Switched reluctance motors have attracted much attention due to their simple and robust structure, low manufacturing cost and good speed regulation performance.
- its special double salient pole structure and switching excitation method make the output electromagnetic torque have large pulsation, which seriously restricts its application in the field.
- researchers have proposed various methods to eliminate the torque.
- the pulsation also minimizes the copper loss.
- the switched reluctance motor system has an upper current limit, and the current limitation allows the switched reluctance motor to output only a limited range of smooth torque. Therefore, there is a certain operable range for the control of all output smoothing torques.
- An object of the present invention is to overcome the problems in the prior art and to provide a three-level suppression method for torque ripple of a three-phase switched reluctance motor.
- the three-phase switching reluctance motor torque ripple three-level suppression method of the present invention comprises the following steps:
- the rotor position 0° is the minimum phase inductance position
- the rotor position ⁇ r is the pitch angle, that is, one rotor period, and the half rotor period is ⁇ r /2;
- the excitation state S B is set to the B-phase power supply excitation state
- the expected total smoothing torque is T e ;
- the A-phase power supply excitation ratio B-phase power supply excitation advances ⁇ r /3, at this time, A is related to break, B phase is open, and the A-phase to B-phase is divided into two
- the commutation process of the interval realizes the three-level suppression of the torque ripple of the three-phase switched reluctance motor.
- phase A to phase B is divided into two sections of the commutation process:
- phase A continues to use the second set of torque thresholds (th2 low , th2 zero , th2 up ), and phase B continues to use the first set of torque thresholds (th1 Low ,th1 zero ,th1 up );
- the present invention only needs to set two sets of torque thresholds and set adjacent A-phase and B-phase excitation states, respectively, so that the A-phase and B-phase are positive and zero in the excitation excitation voltage, respectively.
- Switching between three kinds of excitation states controlling the total torque between the two sets of torque thresholds, suppressing the torque ripple of the three-phase switched reluctance motor, realizing the direct instantaneous torque smoothing control of the three-phase switched reluctance motor, the motor
- the excitation voltage waveform of the winding has the same characteristics as the desired voltage waveform, and the actual phase current is highly consistent with the desired phase current, so that the switched reluctance motor outputs a maximum range of smooth torque. It has strong versatility and is suitable for three-phase switched reluctance motor drive systems of various types and structures. It has good practical effects and has wide application prospects.
- FIG. 1 is a schematic diagram showing a three-level torque threshold setting of a switched reluctance motor of the present invention
- 2(a) is a schematic diagram showing the conversion of the B-phase power supply excitation state of the switched reluctance motor of the present invention
- 2(b) is a schematic view showing the conversion of the A-phase power supply excitation state of the switched reluctance motor of the present invention
- Fig. 3 is a diagram showing the torque waveform of the switched reluctance motor of the present invention.
- the rotor position 0° is the minimum phase inductance position
- the rotor position ⁇ r is the pitch angle, that is, one rotor period, and the half rotor period is ⁇ r /2;
- Indicates that the B-phase excitation voltage is zero, the excitation state S B -1 indicates that the B-phase excitation voltage is negative, and the desired total smoothing torque is T e ;
- the A-phase power supply excitation ratio B-phase power supply excitation advances ⁇ r /3, at this time, A is related to break, B phase is open, and the A-phase to B-phase is divided into two
- the commutation process of the interval is to achieve the three-level suppression of the torque ripple of the three-phase switched reluctance motor, as shown in FIG. 1;
- phase A continues to use the second set of torque thresholds (th2 low , th2 zero , th2 up ), and phase B continues to use the first set of torque thresholds (th1 Low ,th1 zero ,th1 up );
- Torque setting for adjacent C-phase and A-phase power supply C-phase power supply excitation ratio A-phase power supply excitation ⁇ r /3, torque switching threshold setting, commutation process, C-phase and A-phase excitation state switching transfer method, and The above situation is similar.
Abstract
Description
Claims (2)
- 一种三相开关磁阻电机转矩脉动三电平抑制方法,其特征在于:a.在转子位置区间[0°,θr/3]设置第一组转矩阈值(th1low,th1zero,th1up),在转子位置区间[θr/3,θr/2]设置第二组转矩阈值(th2low,th2zero,th2up),这6个转矩阈值满足条件:th1up>th1zero>th2up>0 (1)0>th1low>th2zero>th2low (2)|th1zero|=|th2zero| (3)|th1up|=|th2low| (4)|th2up|=|th1low| (5)其中,转子位置0°为最小相电感位置,转子位置θr为齿距角即一个转子周期,半个转子周期是θr/2;b.设置励磁状态SA为A相供电励磁状态,励磁状态SA=1表示A相励磁电压为正,励磁状态SA=0表示A相励磁电压为零,励磁状态SA=-1表示A相励磁电压为负;设置励磁状态SB为B相供电励磁状态,励磁状态SB=1表示B相励磁电压为正,励磁状态SB=0表示B相励磁电压为零,励磁状态SB=-1表示B相励磁电压为负,期望的总平滑转矩为Te;c.对相邻的A相和B相供电励磁,A相供电励磁比B相供电励磁超前θr/3,此时,A相关断,B相开通,通过将A相到B相分为两个区间的换相过程,实现三相开关磁阻电机转矩脉动的三电平抑制。
- 根据权利要求1所述的一种三相开关磁阻电机转矩脉动三电平抑制方法,其特征在于:所述A相到B相分为两个区间的换相过程:(1)在转子位置区间[0°,θ1],A相使用第二组转矩阈值(th2low,th2zero,th2up),B相使用第一组转矩阈值(th1low,th1zero,th1up),临界位置θ1是在换相过程中自动出现的,无需额外进行计算;(1.1)在转子位置0°位置进入B相导通周期,设定初始励磁状态SB=1,B相电流和转矩从0开始增大;励磁状态SA保持原有状态SA=1,A相电流与转矩增加。总转矩增加;(1.2)当总转矩增加到转矩值Te+th2up,励磁状态SA由1转换为-1,A相转矩减小;B相保持原有状态,B相转矩继续增加。由于此时B相电感变化率及相电流较小,B相转矩增加速率小于A相转矩下降速率,总转矩变化趋势由A相决定,总转矩减小;(1.3)当总转矩首先减小到转矩值Te+th1low,不满足A、B两相状态转移条件,励磁状态SA和SB保持原有状态,总转矩继续减小;(1.4)当总转矩减小到转矩值Te+th2zero,触发A相状态由励磁状态SA=-1转变为励磁状态SA=0,A相转矩减小,但减小速率比励磁状态SA=-1时要小;B相保持原有励磁状态,转矩继续增加。此时在励磁状态SA=0,励磁状态SB=1的情况下,A相转矩减小速率大于B相转矩增加速率,总转矩减小;(1.5)当总转矩减小到转矩值Te+th2low,满足A相状态转移条件,A相状态由励磁状态SA=0转变为励磁状态SA=1,A相转矩增大;B相保持原有状态,转矩继续增加;总转矩增加;(1.6)当总转矩依次增加到转矩值Te+th2zero与Te+th1low,但均不满足A、B相的状态转移条件,总转矩继续增加;(1.7)当总转矩增加到转矩值Te+th2up,重复步骤(1.2)~(1.6),B相状态未被触发而改变,保持励磁状态SB=1;A相励磁状态在1、0和-1间切换,将总转矩控制在[Te+th2low,Te+th2up]之间,从而抑制三相开关磁阻电机转矩在转子位置区间[0°,θ1]的脉动;(1.8)随着转子位置增大,B相电感变化率及电流增大到一定水平,在某一临界位置之后,当励磁状态SA=0,励磁状态SB=1时,A相转矩减小速率小于B相转矩增加速率,总转矩上升;(2)在转子位置区间[θ1,θr/3],A相继续使用第二组转矩阈值(th2low,th2zero,th2up),B相继续使用第一组转矩阈值(th1low,th1zero,th1up);(2.1)在转子位置θ1位置,总转矩达到转矩值Te+th2up,A相状态切换为励磁状态SA=-1;B相保持励磁状态SB=1,在该位置A相转矩在负供电电压激励下的下降速率大于B相转矩在正供电电压激励下的增加速率,因此总转矩下降。然而该状况在随后发生改变,随着转子位置增加,尽管A、B两相励磁状态均未变,但A相在励磁状态SA=-1状态下的转矩下降速率小于B相在励磁状态SB=1状态下的转矩增加速率,从而总转矩上升;(2.2)当总转矩上升到转矩值Te+th2up,励磁状态SA和励磁状态SB均未被触发改变状态,总转矩继续上升;(2.3)当总转矩达到转矩值Te+th1zero,满足B相状态转移条件,励磁状态SB转换为0,B相转矩减小;A相保持原有励磁状态SA=-1,总转矩减小;(2.4)当总转矩减小到转矩值Te+th2up,励磁状态SA和励磁状态SB均未被触发改变状态,总转矩继续减小;(2.5)当总转矩减小到转矩值Te+th1low,满足B相状态转移条件,励磁状态SB转换为1,B相转矩增加;A相保持原有励磁状态SA=-1,总转矩上升;(2.6)重复步骤(2.2)~(2.5),励磁状态SA保持-1,A相转矩和电流持续变小;励磁状态SB在0和1之间切换,总转矩被控制在[Te+th1low,Te+th1zero]之间,从而抑制三相开关磁阻电机转矩在转子位置区间[θ1,θr/3]的脉动;(2.7)当转子位于临界位置,B相转矩在励磁状态SB=0时转矩增加,且增加速率大于A相在励磁状态SA=-1时转矩下降速率,此时总转矩上升;(2.8)当总转矩上升至转矩值Te+th1up,B相状态被触发改变,励磁状态SB从0转为-1,B相转矩减小;A相转矩继续减小,总转矩减小;(2.9)当总转矩依次减小到转矩值Te+th1zero与转矩值Te+th2up,励磁状态SA和励磁状态SB均未被触发改变状态,总转矩继续减小;(2.10)当总转矩减小到转矩值Te+th1low,励磁状态SB被触发改变为1,B相转矩增加;A相保持原有状态,A相转矩继续减小,总转矩增加;(2.11)当总转矩增加到转矩值Te+th1zero,励磁状态SB被触发改变为0,励磁状态SA保持为-1,此时情况与(2.7)相同,重复步骤(2.7)~(2.11),励磁状态SA保持-1,励磁状态SB在-1,0和1之间切换,总转矩被控制在[Te+th1low,Te+th1up]之间,从而抑制三相开关磁阻电机转矩在转子位置区间[θ1,θr/3]的脉动;(2.12)当转子位于临界位置,B相转矩在励磁状态SB=0、励磁状态SA=-1时总转矩不再增加,而是降低,从此刻起重复步骤(2.2)~(2.5),总转矩被控制在[Te+th1low,Te+th1zero]之间,从而抑制三相开关磁阻电机转矩在转子位置区间[θ1,θr/3]的脉动。
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AU2015309429A AU2015309429B2 (en) | 2014-08-27 | 2015-07-31 | Three-phase switched reluctance motor torque ripple three-level suppression method |
RU2016120686A RU2641674C2 (ru) | 2014-08-27 | 2015-07-31 | Способ трехуровневого подавления пульсаций крутящего момента трехфазного вентильного реактивного электродвигателя |
US15/128,947 US10224855B2 (en) | 2014-08-27 | 2015-07-31 | Three-phase switched reluctance motor torque ripple three-level suppression method |
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US9906182B2 (en) | 2014-08-27 | 2018-02-27 | China University Of Mining And Technology | Three-phase switched reluctance motor torque ripple two-level suppression method |
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CN104300846B (zh) * | 2014-08-27 | 2016-12-07 | 中国矿业大学 | 一种三相开关磁阻电机转矩脉动三电平抑制方法 |
CN105262406B (zh) * | 2015-11-26 | 2018-01-09 | 合肥工业大学 | 基于三电平逆变器的开关磁阻电机驱动结构及控制方法 |
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AU2015309429A1 (en) | 2016-09-01 |
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