WO2017008452A1 - 一种计及铁损耗的开关磁阻电机相电感估测方法 - Google Patents

一种计及铁损耗的开关磁阻电机相电感估测方法 Download PDF

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WO2017008452A1
WO2017008452A1 PCT/CN2015/099097 CN2015099097W WO2017008452A1 WO 2017008452 A1 WO2017008452 A1 WO 2017008452A1 CN 2015099097 W CN2015099097 W CN 2015099097W WO 2017008452 A1 WO2017008452 A1 WO 2017008452A1
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value
voltage
switched reluctance
phase
current
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陈昊
王千龙
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China University of Mining and Technology Beijing CUMTB
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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

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  • the invention relates to a method for estimating the phase inductance of a switched reluctance motor taking account of iron loss, and is suitable for a switched reluctance motor system with various phase numbers and using a plurality of power converters.
  • the influence of iron loss is neglected. It is considered that the rise time and fall time of the current generated by the phase winding response are the same, and the rising slope and the falling slope are also the same. However, the iron loss of the switched reluctance motor can not be ignored.
  • the phase current measured by the current sensor should be the sum of the phase winding current and the iron current; in the discharge phase, the direction of the iron current will be reversed, which will result in The phase current measured by the current sensor shows a rapid decline.
  • the measured phase current of the current sensor should be the difference between the phase winding current and the iron current. Therefore, the iron loss of the switched reluctance motor leads to the large phase inductance error of the conventional injection pulse voltage current peak method and current slope method. The accuracy is not high.
  • the object of the present invention is to overcome the deficiencies in the prior art, and to provide a method for estimating the phase inductance of a switched reluctance motor with simple method, small error, high precision and iron loss.
  • the method for estimating the phase inductance of a switched reluctance motor considering iron loss injecting a voltage pulse into a phase winding of a switched reluctance motor, causing a phase pulse of the switched reluctance motor to generate a current pulse, and detecting a phase winding response by a current sensor
  • the current pulse peak value only needs to detect the current pulse rise time value and the fall time value;
  • the voltage sensor is used to detect the injection voltage pulse voltage value, and the injection voltage pulse is injected into the switching reluctance motor phase winding to charge the total voltage drop value on the power switch and
  • the total voltage drop value of the discharge phase on the freewheeling diode can be used to calculate the phase inductance value of the switched reluctance motor taking into account the iron loss.
  • phase inductance value L w of the switched reluctance motor taking into account the iron loss can be calculated.
  • the present invention injects a voltage pulse into a phase winding of a switched reluctance motor, and uses a current sensor to detect a peak value of a current pulse generated by a phase winding response, and only needs to detect a current pulse rise time value and a fall time value, and the voltage sensor only needs to detect the injection.
  • the voltage pulse voltage value, the injection voltage pulse injected into the phase winding of the switched reluctance motor, the total voltage drop value on the power switch and the total voltage drop value on the freewheeling diode during the discharge phase can be calculated to take into account the iron loss.
  • the phase inductance value of the switched reluctance motor is small, and the real-time performance is good.
  • the estimated phase reluctance motor has small inductance error, high precision, and is not affected by the loss of motor iron. It has strong practicability and versatility, and has a wide range of Application prospects.
  • 1 is an equivalent circuit of a phase winding of a switched reluctance motor according to the present invention
  • FIG. 2 is a schematic structural view of an injection voltage pulse double-switching power circuit of the present invention
  • FIG. 3 is a schematic diagram of current pulses generated by the response of the injection voltage pulse phase winding of the present invention.
  • FIG. 4 is a schematic view showing the structure of an injection voltage pulse double winding power circuit of the present invention.
  • the method for estimating the phase inductance of a switched reluctance motor considering iron loss according to the present invention has the following specific steps:
  • phase inductance value L w of the switched reluctance motor taking into account the iron loss can be calculated.
  • Embodiment 1 Taking a switched reluctance motor system using a two-switch power converter of each phase as an example,
  • an equivalent circuit of a phase reluctance motor of a switched reluctance motor which includes a loss of iron, includes a phase reluctance motor phase inductance L w , a ferroelectric equivalent resistance R iron connected in parallel across the phase inductance L w , and a phase
  • the winding resistance R cop i tot is the phase current that the current sensor can detect, i w is the actual current of the phase winding, and i iron is the equivalent iron current.
  • a voltage pulse with a voltage value of U S is injected into the phase winding of the switched reluctance motor by a two-switch power converter per phase, and the voltage value of the injected voltage pulse U S is detected by a voltage sensor, and the voltage applied to the phase winding is applied.
  • the value is U t ; during the charging phase, the power switches S 1 and S 2 are closed, as shown in Figure 3, the phase winding responds to generate a current pulse with a current peak value of ⁇ I, and the phase current i tot measured by the current sensor should be the actual phase winding.
  • the sum of the current i w and the equivalent iron current i iron , the total voltage drop value U ⁇ T of the sum of the total voltage drops on the power switches S 1 and S 2 is detected by the voltage sensor, and the rise time value of the current pulse peak ⁇ I is detected. ⁇ t 1 ;
  • the power switches S 1 and S 2 are disconnected, the current pulse is attenuated by the freewheeling diodes D 1 and D 2 , and the direction of the iron current is reversed, resulting in the phase current measured by the current sensor.
  • Tot shows a trend of rapid decline, as shown in Figure 3, the phase current i tot measured by the current sensor should be the difference between the actual current i w of the phase winding and the equivalent iron current i iron .
  • the freewheeling diode D 1 is detected by the voltage sensor. And on D 2 The total pressure drop value U ⁇ D of the sum of the total pressure drops, the falling time value ⁇ t 2 of the detected current pulse peak ⁇ I;
  • phase inductance value L w of the switched reluctance motor taking into account the iron loss can be calculated.
  • Embodiment 2 taking a switched reluctance motor system using a two-winding power converter per phase as an example,
  • the equivalent circuit of the phase winding of the switched reluctance motor considering the iron loss includes the phase reluctance motor phase inductance L w and the iron loss equivalent resistance R iron connected in parallel across the phase inductor L w and the phase winding
  • the resistance R cop i tot is the phase current that the current sensor can detect, i w is the actual current of the phase winding, and i iron is the equivalent iron current.
  • a voltage pulse with a voltage value of U S is injected into the phase winding of the switched reluctance motor by a two-winding power converter per phase, and the voltage value of the injection voltage pulse U S is detected by a voltage sensor, and the voltage applied to the phase winding is applied.
  • the value is U t ; the charging phase, the power switch S is closed, as shown in Figure 3, the phase winding responds to generate a current pulse with a current peak value of ⁇ I, and the phase current i tot measured by the current sensor should be the actual current i w of the phase winding and
  • the sum of the equivalent iron currents i iron , the total voltage drop value U ⁇ T on the power switch S is detected by the voltage sensor, the rise time value ⁇ t 1 of the current pulse peak ⁇ I is detected, and the power switch S is disconnected, the current pulse is discharged during the discharge phase.
  • the measured phase current i tot of the current sensor should be actual current to the phase winding equivalent iron and i w i iron consumption current of the difference, U ⁇ D, ⁇ I detected current pulse peak value of the total pressure drop is lowered by the voltage sensor detects a freewheeling diode D Intermediate value ⁇ t 2; calculated by the formula:
  • phase inductance value L w of the switched reluctance motor taking into account the iron loss can be calculated.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

一种计及铁损耗的开关磁阻电机相电感估测方法，通过对开关磁阻电机相绕组注入电压值为U S的电压脉冲，使其产生电流峰值为ΔI的电流脉冲；用电流传感器检测电流脉冲峰值ΔI，通过电压传感器检测充电阶段在功率开关（S1, S2）上的总压降值U ΔT和放电阶段在续流二极管（D1, D2）上的总压降值U ΔD，并检测电流脉冲的上升时间值Δt 1和下降时间值Δt 2；基于以上参数，估测计及铁损耗的开关磁阻电机相电感值L w。估测的开关磁阻电机相电感误差小、精度高，具有较强实用性与通用性。

Description

一种计及铁损耗的开关磁阻电机相电感估测方法 技术领域
本发明涉及一种计及铁损耗的开关磁阻电机相电感估测方法，适用于各种相数、采用多种功率变换器供电的开关磁阻电机系统。
背景技术
开关磁阻电机传统的注入脉冲电压电感估测方法中，忽略了铁耗的影响，认为相绕组响应产生的电流的上升时间和下降时间是相同的、上升斜率和下降斜率也是相同的。但是开关磁阻电机的铁耗不可忽略，充电阶段，通过电流传感器实测的相电流，应为相绕组电流和铁耗电流之和；放电阶段，铁耗电流的方向会发生翻转，将导致通过电流传感器实测的相电流呈现快速下降的趋势。而电流传感器实测的相电流应为相绕组电流和铁耗电流之差，因此，开关磁阻电机的铁耗导致传统的注入脉冲电压电流峰值法、电流斜差法估测的相电感误差大，精度不高。
发明内容
本发明的目的是克服已有技术中的不足之处，提供一种方法简单、误差小、精度高、计及铁损耗的开关磁阻电机相电感估测方法。
本发明的计及铁损耗的开关磁阻电机相电感估测方法，对开关磁阻电机相绕组注入电压脉冲，使开关磁阻电机相绕组响应产生电流脉冲，通过电流传感器检测相绕组响应产生的电流脉冲峰值，只需检测电流脉冲上升时间值和下降时间值；用电压传感器检测注入电压脉冲电压值、注入电压脉冲向开关磁阻电机相绕组注入充电阶段在功率开关上的总压降值和放电阶段在续流二极管上的总压降值，即可计算出计及铁损耗的开关磁阻电机相电感值，具体步骤如下：
(1)对开关磁阻电机相绕组注入电压值为US的电压脉冲，使开关磁阻电机相绕组响应产生电流脉冲峰值为ΔI的电流脉冲；
(2)用电流传感器检测开关磁阻电机相绕组响应产生的电流脉冲峰值为ΔI，检测电流脉冲峰值ΔI的上升时间值Δt1和电流脉冲峰值ΔI的下降时间值Δt2；
(3)用电压传感器检测注入电压脉冲的电压值US，并用电压传感器检测注入电压脉冲向开关磁阻电机相绕组注入充电阶段在功率开关上的总压降值UΔT，通过电压传感器检测放电阶段在续流二极管上的总压降值UΔD，
(4)由下式：
Figure PCTCN2015099097-appb-000001
即可计算出计及铁损耗的开关磁阻电机相电感值Lw。
有益效果：本发明通过对开关磁阻电机相绕组注入电压脉冲，用电流传感器检测相绕组响应产生的电流脉冲峰值，只需检测电流脉冲上升时间值和下降时间值，用电压传感器只需检测注入电压脉冲电压值、注入电压脉冲向开关磁阻电机相绕组注入充电阶段在功率开关上的总压降值和放电阶段在续流二极管上的总压降值，就可计算出计及铁损耗的开关磁阻电机相电感值，其计算量小、实时性好，估测的开关磁阻电机相电感误差小、精度高、不受电机铁损耗影响，实用性与通用性较强，具有广泛的应用前景。
附图说明
图1是本发明的计及铁损耗的开关磁阻电机相绕组等效电路；
图2是本发明的注入电压脉冲双开关式功率电路结构示意图；
图3是本发明的注入电压脉冲相绕组响应产生的电流脉冲示意图；
图4是本发明的注入电压脉冲双绕组式功率电路结构示意图。
具体实施方式
下面结合附图对本发明的实施例作进一步的描述：
本发明的计及铁损耗的开关磁阻电机相电感估测方法，具体步骤如下：
(1)对开关磁阻电机相绕组注入电压值为US的电压脉冲，使开关磁阻电机相绕组响应产生电流脉冲峰值为ΔI的电流脉冲；
(2)用电流传感器检测开关磁阻电机相绕组响应产生的电流脉冲峰值为ΔI，检测电流脉冲峰值ΔI的上升时间值Δt1和电流脉冲峰值ΔI的下降时间值Δt2；
(3)用电压传感器检测注入电压脉冲的电压值US，并用电压传感器检测注入电压脉冲向开关磁阻电机相绕组注入充电阶段在功率开关上的总压降值UΔT，通过电压传感器检测放电阶段在续流二极管上的总压降值UΔD，
(4)由下式：
Figure PCTCN2015099097-appb-000002
即可计算出计及铁损耗的开关磁阻电机相电感值Lw。
实施例一、以采用每相双开关功率变换器的开关磁阻电机系统为例，
如图1所示，计及铁损耗的开关磁阻电机相绕组等效电路，它包含开关磁阻电机相电感Lw、铁耗等效电阻Riron并联在相电感Lw两端、及相绕组电阻Rcop，itot是电流传感器能检测到的相电流，iw为相绕组实际电流，iiron为等效的铁耗电流。
如图2所示，以每相双开关功率变换器对开关磁阻电机相绕组注入电压值为US的电压脉冲，通过电压传感器检测注入电压脉冲电压值US，加在相绕组上的电压值是Ut；充 电阶段，功率开关S1和S2闭合，如图3所示，相绕组响应产生电流峰值为ΔI的电流脉冲，通过电流传感器实测的相电流itot，应为相绕组实际电流iw和等效铁耗电流iiron之和，通过电压传感器检测功率开关S1和S2上的总压降之和的总压降值UΔT，检测电流脉冲峰值ΔI的上升时间值Δt1；放电阶段，功率开关S1和S2断开，电流脉冲通过续流二极管D1和D2路径续流衰减，铁耗电流的方向发生翻转，导致通过电流传感器实测的相电流itot呈现快速下降的趋势，如图3所示，电流传感器实测的相电流itot应为相绕组实际电流iw和等效铁耗电流iiron之差，通过电压传感器检测续流二极管D1和D2上的总压降之和的总压降值UΔD，检测电流脉冲峰值ΔI的下降时间值Δt2；由计算式：
Figure PCTCN2015099097-appb-000003
即可计算出计及铁损耗的开关磁阻电机相电感值Lw。
实施例二、以采用每相双绕组功率变换器的开关磁阻电机系统为例，
如图1所示，计及铁损耗的开关磁阻电机相绕组等效电路，包含开关磁阻电机相电感Lw、铁耗等效电阻Riron并联在相电感Lw两端、及相绕组电阻Rcop，itot是电流传感器能检测到的相电流，iw为相绕组实际电流，iiron为等效的铁耗电流。
如图4所示，以每相双绕组功率变换器对开关磁阻电机相绕组注入电压值为US的电压脉冲，通过电压传感器检测注入电压脉冲电压值US，加在相绕组上的电压值是Ut；充电阶段，功率开关S闭合，如图3所示，相绕组响应产生电流峰值为ΔI的电流脉冲，通过电流传感器实测的相电流itot，应为相绕组实际电流iw和等效铁耗电流iiron之和，通过电压传感器检测功率开关S上的总压降值UΔT，检测电流脉冲峰值ΔI的上升时间值Δt1；放电阶段，功率开关S断开，电流脉冲通过续流二极管VD路径续流衰减，铁耗电流的方向发生翻转，导致通过电流传感器实测的相电流itot呈现快速下降的趋势，如图3所示，电流传感器实测的相电流itot应为相绕组实际电流iw和等效铁耗电流iiron之差，通过电压传感器检测续流二极管D上的总压降值UΔD，检测电流脉冲峰值ΔI的下降时间值Δt2；由计算式：
Figure PCTCN2015099097-appb-000004
即可计算出计及铁损耗的开关磁阻电机相电感值Lw。

Claims (1)

  1. 一种计及铁损耗的开关磁阻电机相电感估测方法，其特征在于：对开关磁阻电机相绕组注入电压脉冲，使开关磁阻电机相绕组响应产生电流脉冲，通过电流传感器检测相绕组响应产生的电流脉冲峰值，只需检测电流脉冲上升时间值和下降时间值；用电压传感器检测注入电压脉冲电压值、注入电压脉冲向开关磁阻电机相绕组注入充电阶段在功率开关上的总压降值和放电阶段在续流二极管上的总压降值，即可计算出计及铁损耗的开关磁阻电机相电感值，具体步骤如下：
    (1)对开关磁阻电机相绕组注入电压值为US的电压脉冲，使开关磁阻电机相绕组响应产生电流脉冲峰值为ΔI的电流脉冲；
    (2)用电流传感器检测开关磁阻电机相绕组响应产生的电流脉冲峰值为ΔI，检测电流脉冲峰值ΔI的上升时间值Δt1和电流脉冲峰值ΔI的下降时间值Δt2；
    (3)用电压传感器检测注入电压脉冲的电压值US，并用电压传感器检测注入电压脉冲向开关磁阻电机相绕组注入充电阶段在功率开关上的总压降值UΔT，通过电压传感器检测放电阶段在续流二极管上的总压降值UΔD，
    (4)由下式：
    Figure PCTCN2015099097-appb-100001
    即可计算出计及铁损耗的开关磁阻电机相电感值Lw。
PCT/CN2015/099097 2015-07-10 2015-12-28 一种计及铁损耗的开关磁阻电机相电感估测方法 Ceased WO2017008452A1 (zh)

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