Universal Bridge 翻译

Universal Bridge

Implement 采用universal power converter 通用电源转换器with selectable topologies 可选拓扑and power electronic devices电力电子器件

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Power Electronics

Description

The Universal Bridge block 通用桥接模块implements实现a universal three-phase power converter三相电源转换器that consists of up to多达six power switches

connected in a bridge configuration六个以桥接方式连接的电源开关组成. The type of power switch and converter configuration are selectable from the dialog box电源开关和转换器配置的类型可以从对话框中选择.

The Universal Bridge block allows simulation of converters using both naturally commutated自然换向(or line-commutated线性换向) power electronic devices (diodes or thyristors二极管或晶闸管) and forced-commutated devices 强制换向器件(GTO, IGBT, MOSFET).

The Universal Bridge block is the basic block for building two-level voltage-sourced converters (VSC)两级电压源转换器（VSC）.

The device numbering is different if the power electronic devices are naturally commutated or forced-commutated. For a naturally commutated three-phase converter (diode and thyristor), numbering follows the natural order of commutation:

如果电力电子设备自然地换向或强制换向，则设备编号是不同的。对于自然换向的三相变换器（二极管和晶闸管），编号遵循换向的自然顺序：

For the case of a two-phase diode or thyristor bridge, and for any other bridge configuration, the order of commutation is the following:

对于二相二极管或晶闸管桥的情况，以及对于任何其他的桥配置，换向顺序如下：

GTO-Diode bridge:

IGBT-Diode bridge:

MOSFET-Diode and Ideal Switch bridges:

Dialog Box and Parameters

对话框和参数

Number of bridge arms桥臂的数量

Set to 1 or 2 to get a single-phase converter (two or four switching devices). Set to 3 to get a three-phase converter connected in Graetz bridge configuration (six switching devices).

设置为1或2获得一个单相转换器（两个或四个开关设备）。设置为3以获得以Graetz 桥配置（六个开关设备）连接的三相转换器

Snubber resistance Rs缓冲电阻Rs

The snubber resistance, in ohms . Set the Snubber resistance Rs parameter to inf to eliminate the snubbers from the model.

缓冲电阻，单位为欧姆。将缓冲电阻Rs参数设置为inf，以消除模型中的缓冲器。Snubber capacitance Cs吸收电容Cs

The snubber capacitance, in farads (F). Set the Snubber capacitance Cs parameter to 0 to eliminate the snubbers, or to inf to get a resistive snubber.

吸收电容，单位为法拉（F）。将吸收电容Cs参数设置为0以消除缓冲器，或者设置到inf为了得到一个阻性缓冲器。

In order to avoid numerical oscillations数值振荡when your system is discretized系统离散, you need to specify Rs and Cs snubber values for diode and thyristor bridges你需要指定二极管和晶闸管桥的Rs和Cs缓冲器值. For forced-commutated devices (GTO, IGBT, or MOSFET), the bridge operates satisfactorily with purely resistive snubbers纯电阻缓冲器as long as firing pulses触发脉冲are sent to switching devices.

对于强制换向的器件（GTO，IGBT或MOSFET），只要触发脉冲发送到开关器件，电桥就可以使用纯电阻缓冲器来进行工作。

If firing pulses to forced-commutated devices are blocked被阻断, only antiparallel diodes operate反并联二极管工作, and the bridge operates as a diode rectifier电桥则作为二极管整流器工作. In this condition appropriate values of Rs and Cs must also be used在这种情况下，也必须使用合适的Rs和Cs值.

When the system is discretized, use the following formulas to compute approximate values of Rs and Cs:当系统离散化时，使用以下公式计算Rs和Cs的近似值：

where

Pn = nominal power of single or three phase converter (VA)

Pn =单相或三相变换器的额定功率（VA）

Vn = nominal line-to-line AC voltage (Vrms)

Vn =额定交流线电压（Vrms）

f = fundamental frequency (Hz)

f =基频（Hz）

Ts = sample time (s)

Ts =采样时间（s）

These Rs and Cs values are derived from the following two criteria: