Browse Prior Art Database

ROTARY FREQUENCY CONVERTER

IP.com Disclosure Number: IPCOM000230042D
Publication Date: 2013-Aug-15
Document File: 2 page(s) / 51K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique that provides a means of connection between asynchronous electrical power systems of same or differing frequencies. The technique includes a rotary power converter. The rotary power converter includes a synchronous motor which is used to drive a synchronous generator through a mechanical coupling system. The synchronous motor incorporates use of a hydrodynamic torque converter which permits angular adjustment of the motor rotor position with respect to generator rotor position.

This text was extracted from a Microsoft Word document.
This is the abbreviated version, containing approximately 53% of the total text.

ROTARY FREQUENCY CONVERTER

 

BACKGROUND

The present invention relates generally to asynchronous electrical power systems and more particularly to a means of connection between asynchronous electrical power systems of same or differing frequencies.

Generally, a synchronous machine is directly connected to a power system. In such a case, speed of the synchronous machine is established by frequency of the power system. For a system consisting of a synchronous motor directly coupled to a synchronous generator, there is no means of adjusting no-load phase angle of generator voltage waveform with respect to the power system that the system is connected to. Further, no-load phase angle of generator voltage waveform is independent of adjusting actual frequencies of the power systems.

Rotary frequency converters are known in the prior art. However, in a conventional technique, stator shifting devices are used for systems consisting of synchronous motor coupled to a synchronous generator. The stator shifting devices are used in order to facilitate open circuit voltage phase angle adjustment and machine load angle adjustment. However, the conventional technique does not provide required output power quality and required efficiency using synchronous machines.

Another conventional technique uses a rotating equipment to provide an alternative to the use of static frequency converter technology that is based on the use of power electronic devices. However, the technique finds application only in a small scale utility.

Therefore there is a need in the art for a technique that provides an efficient rotary frequency converter for connection between asynchronous electrical power systems of same or differing frequencies.  

DETAILED DESCRIPTION

The invention proposes a technique that provides a means of connection between asynchronous electrical power systems of same or differing frequencies. The technique includes a rotary power converter. The rotary power converter includes a synchronous motor which is used to drive a synchronous generator through a mechanical coupling system. The synchronous motor incorporates use of a hydrodynamic torque converter which permits angular adjustment of the motor rotor position with respect to generator rotor position.

The synchronous motor starts its operation and electricall...