A Brushless Synchronous Generator for Standalone DC Applications

Haimanti Bhattacherjee, Yalla Tirumala Rao, C. Chakraborty
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引用次数: 1

Abstract

Owing to several advantages like easy integration with renewable energy systems, requirement of less number of power conversion stages, better stability and inter-connectivity etc., dc grids are becoming popular. This paper presents an alternative generating systems for dc applications. A recently proposed brushless and permanent magnet-less synchronous generator is used for such purpose. The machine is basically a synchronous machine where an induction machine (that is embedded in the same machine structure) is used for providing controlled excitation to the synchronous machine. The synchronous and induction machines are wound for different number poles such that they remain magnetically decoupled. The field winding of the synchronous machine (SM) is fed by the rotor-induced-emf of the induction machine (IM) through a rotating diode rectifier. For any operating speed, the IM has the ability to operate in different modes simply by varying its stator frequency. In the present work, the synchronous generator (SG) is connected to a dc load through a diode bridge rectifier (DBR). A simple controller is proposed that maintains the load-side dc voltage under different loading conditions. The q-axis component of the stator current of IM is used to regulate the field-excitation of SM using rotor-flux-oriented-control technique. Extensive PLECS simulations are presented to demonstrate the working of the proposed controller. A sample experimental results from the prototype shows the usefulness of the developed generator for dc-grid application.
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用于独立直流应用的无刷同步发电机
由于易于与可再生能源系统集成、需要较少的功率转换阶段、稳定性好、互联性好等优点,直流电网越来越受欢迎。本文介绍了一种用于直流应用的替代发电系统。最近提出的无刷无永磁同步发电机用于此目的。这台机器基本上是一台同步机器,其中感应电机(嵌入在同一机器结构中)用于向同步机器提供受控励磁。同步电机和感应电机绕成不同数量的磁极,使它们保持磁去耦。同步电机(SM)的磁场绕组由感应电机(IM)的转子感应电动势通过旋转二极管整流器馈送。对于任何运行速度,IM有能力在不同的模式下运行,只需改变其定子频率。在本工作中,同步发电机(SG)通过二极管桥式整流器(DBR)与直流负载连接。提出了一种在不同负载条件下保持负载侧直流电压的简单控制器。采用转子磁通定向控制技术,利用IM定子电流的q轴分量来调节SM的励磁。广泛的PLECS仿真演示了所提出的控制器的工作。样机的实验结果表明,所研制的发电机在直流电网中的应用是有效的。
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