异步电机(2)

2020-04-03 00:02

Also, as the inertia J2 is ignored in machine 2, J2 referred to machine 1 speed must be added to machine 1 inertia J1.

下图表示如何模拟当电机2被忽略摩擦转矩时,刚性轴互连在电动机 - 发电机组的装

置。电机1(电动机)的速度输出被连接到电机2(发电机)的速度输入,而电机2的电磁输出转矩Te被施加到电机1的机械输入转矩Tm。KT因数需要考虑两台机器的速

度单位(PU或为rad / s)和齿轮箱传动比W2/W1。 KT因数需要考虑两台机器的转矩单位(PU或Nm)和电机的额定功率。此外,在电机2中惯性J2被忽略,J2涉及到电机1的速度必须被加到电机1的惯性J1。

Select Mechanical rotational port to add to the block a Simscape mechanical rotational port that allows connection of the machine shaft with other Simscape blocks having mechanical rotational ports. The Simulink input representing the mechanical torque Tm or the speed w of the machine is then removed from the block.

选择机械转动端口添加一个Simscape机械转动端口模块,它允许与其他有机旋转端口机器轴的Simscape模块连接。Simulink输入(机械转矩Tm或电机的速度w)是从模块中移除。

The next figure indicates how to connect an Ideal Torque Source block from the Simscape library to the machine shaft to represent the machine in motor mode, or in generator mode, when the rotor speed is positive.

下图表示,当转子转速是正向时,如何从Simscape库连接一个理想的转矩源模块,机轴代

表机器在电动机模式,或发电机模式。

Rotor type

Specifies the type of rotor: Wound, Squirrel-cage, or Double squirrel-cage.

转子类型

指定类型的转子:绕线,鼠笼式,或双鼠笼式。 Reference frame

Specifies the reference frame that is used to convert input voltages (abc reference frame) to the dq reference frame, and output currents (dq reference frame) to the abc reference frame. You can choose among the following reference frame transformations:

参考系

指定参考系用来转换输入电压(abc参考系)到dq参考系,和输出电流(dq参考系)

到abc参考系。

您可以选择下面的参考系之间的转换: ? ? ? ? ?

Rotor (Park transformation)

Stationary (Clarke or αβ transformation) Synchronous

转子(Park变换)

固定(Clarke或αβ变换)

? 同步

The following relationships describe the abc-to-dq reference frame transformations applied to the Asynchronous Machine phase-to-phase voltages.

下面的关系描述了应用到异步电机相电压中abc到 dq参考系的转换。

In the preceding equations, Θ is the angular position of the reference frame, while β = θ – θr is the difference between the position of the reference frame and the position (electrical) of the rotor. Because the machine windings are connected in a three-wire Y configuration, there is no homopolar (0) component. This configuration also justifies that two line-to-line input voltages are used inside the model instead of three line-to-neutral voltages. The following relationships describe the dq-to-abc reference frame transformations applied to the Asynchronous Machine phase currents.

在前面的方程中,θ是参照系的角度位置,而β=θ – θr在参照系的位置和转子的位置(电气)之间是不同的。因为电机绕组是三线Y结构的连接方式,没有单极(0)分量。此结构还证明两线输入电压使用内部的模型,而不是三线到中性点电压。下面的关系描述应用到异步电机相电流中dq-abc参考系的转换。

The following table shows the values taken by Θ and β in each reference frame (Θe is the position of the synchronously rotating reference frame).

下表显示了在每个参考系(θe是同步旋转参考系的位置)的Θ和β所取的值。

The choice of reference frame affects the waveforms of all dq variables. It also affects the simulation speed and in certain cases the accuracy of the results. The following guidelines are suggested in [1]:

参照系的选择会影响所有dq变量的波形。它也影响了仿真的速度和在某些情况下结果的准确性。 下面的指导被建议在[1]: ? ? ? ? ? ?

Use the stationary reference frame if the stator voltages are either unbalanced or discontinuous and the rotor voltages are balanced (or 0).

Use the rotor reference frame if the rotor voltages are either unbalanced or discontinuous and the stator voltages are balanced.

Use either the stationary or synchronous reference frames if all voltages are balanced and continuous.

如果定子的电压是不平衡的或不连续的,转子的电压是平衡的(或0),使用固定的参照系。

如果转子的电压是不平衡的或不连续的,并且所述定子电压是平衡的,使用转子的参考系。

使用固定或同步的参考系,如果所有的电压是平衡的,连续的。

Mask units

Specifies the units of the electrical and mechanical parameters of the model. Mask 单位

指定模型中电气和机械参数的单位。 Parameters Tab

参数“选项卡

This tab contains the electrical parameters of the machine. To estimate the electrical parameters of a double-cage asynchronous machine based on standard manufacturer specifications, you can use the power_AsynchronousMachineParams function.

此选项卡包含电机的电气参数。预计基于标准的制造商规格的双笼异步电机的电气参数,您可以使用power_AsynchronousMachineParams功能。

Nominal power, voltage (line-line), and frequency

The nominal apparent power Pn (VA), RMS line-to-line voltage Vn (V), and frequency fn (Hz). 额定功率,电压(线 - 线),和频率

额定视在功率(VA),线电压Vn(Ⅴ),和频率fn(赫兹)。 Stator resistance and inductance

The stator resistance Rs (Ω or pu) and leakage inductance Lls (H or pu). 定子电阻和电感

定子电阻Rs(Ω或PU)和漏感LLS(H或PU)。 Rotor resistance and inductance

The rotor resistance Rr' (Ω or pu) and leakage inductance Llr' (H or pu), both referred to the stator. This parameter is visible only when the Rotor type parameter on the Configuration tab is set to Wound or Squirrel-cage. 转子电阻和电感

转子电阻Rr'(Ω或pu)和漏感LLR(H或pu),都转换到定子。这些参数是可见的只有当在“配置”选项卡上的转子类型的参数设置为绕线式或鼠笼式。 Cage 1 resistance and inductance

The rotor resistance Rr1' (Ω or pu) and leakage inductance Llr1' (H or pu), both referred to the stator. This parameter is visible only when the Rotor type parameter on the Configuration tab is set to Double squirrel-cage. 笼1 电阻和电感

转子电阻R r1'(Ω或PU)和漏感LLR1'(H或pu),均转换到定子。此参数是可见,只有当转子型“配置”选项卡上的参数设置为双鼠笼式。

Cage 2 resistance and inductance

The rotor resistance Rr2' (Ω or pu) and leakage inductance Llr2' (H or pu), both referred to the stator. This parameter is visible only when the Rotor type parameter on the Configuration tab is set to Double squirrel-cage. 笼2 电阻和电感

转子电阻RR2'(Ω或PU)和漏感Llr2'(H或pu),均转换到定子。此参数是可见的,只有当转子型“配置”选项卡上的参数设置为双鼠笼式。 Mutual inductance

The magnetizing inductance Lm (H or pu). 互感

磁化电感Lm(H或PU)。

Inertia constant, friction factor, and pole pairs

For the SI units dialog box: the combined machine and load inertia coefficient J (kg.m2), combined viscous friction coefficient F (N.m.s), and pole pairs p. The friction torque Tf is proportional to the rotor speed ω (Tf = F.w).

For the pu units dialog box: the inertia constant H (s), combined viscous friction coefficient F (pu), and pole pairs p.

惯性时间常数,摩擦系数,和极对数

对于SI单位“对话框中:组合机床和负载惯量系数(Jkg.m2),联合粘性摩擦系数(fNMS),

和极对数p。摩擦转矩Tf是正比于转子的转速ω(Tf= F.W)。 对于PU, “对话框中的惯性常数H(S),联合粘性摩擦系数F(PU),和极对数p。 Initial conditions

Specifies the initial slip s, electrical angle Θe (degrees), stator current magnitude (A or pu), and phase angles (degrees):

[slip, th, ias, ibs, ics, phaseas, phasebs, phasecs]

If the Rotor type parameter is set to Wound, you can also specify optional initial values for the rotor current magnitude (A or pu), and phase angles (degrees):

[slip, th, ias, ibs, ics, phaseas, phasebs, phasecs, iar, ibr, icr, phasear, phasebr, phasecr] When the Rotor type parameter is set to Squirrel-cage, the initial conditions can be computed by the Load Flow tool or the Machine Initialization tool in the Powergui block.

初始条件

指定初始转差率s,电气的角度Θe(度),定子电流的幅值(A或PU),和相角(度): [slip, th, ias, ibs, ics, phaseas, phasebs, phasecs]

如果转子的类型参数设置为绕线式,你也可以指定可选的初始值,转子电流的幅值(A或 PU),相角(度):

[slip, th, ias, ibs, ics, phaseas, phasebs, phasecs, iar, ibr, icr, phasear, phasebr, phasecr]当鼠笼式转子类型的参数被设置,初始条件可以被计算通过负载流工具或在PowerGUI模块中的机器初始化工具。 Simulate saturation

Specifies whether magnetic saturation of rotor and stator iron is simulated or not. 模拟饱和

指定是否是模拟转子和定子铁心磁饱和。


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