介绍了弹性分组环（RPR）技术的特征，将其与SDH/SONET、以太网技术作了对比，以体现其在环型拓扑结构上支持数据业务的优势。
This paper introduces the characters of resilient packet ring (RPR) technologies, and the advantages of RPR comparing to SDH/SONET and Ethernet when provides data services in ring topology.
通信网络可以按照其物理排列或拓扑结构来分类。有三种常见的拓扑结构：星型、总线型和环型。
Communication networks can be classified in terms of their physical arrangement or topologies. Three common topologies are the star, bus, and ring.
有三种常见的拓扑结构：星型、总线型和环型。
逆变器采用全桥型的拓扑结构，利用了SPWM逆变技术，逆变电压控制通过简单的单环反馈实现，控制方法采用PID算法。
The inverter uses full bridge topology and SPWM technique. The inverter voltage is controlled by single closed loop feedback based on PID.
基于三相电压型PWM整流器主电路拓扑结构，建立了三相电压型PWM整流器的数学模型，提出一种基于电压环的控制方法。
Based on the circuit of three-phase voltage-type PWM rectifier, the mathematical model of three-phase voltage-type PWM rectifier is established. A voltage cycle control method is presented.
基于三相电压型PWM整流器主电路拓扑结构，建立了三相电压型PWM整流器的数学模型，提出一种基于电压环的控制方法。
Based on the circuit of three-phase voltage-type PWM rectifier, the mathematical model of three-phase voltage-type PWM rectifier is established. A voltage cycle control method is presented.
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