Open circuit voltage distortion in salient pole synchronous generators with damper windings

Abstract

This paper examines efficient methods for the calculation of open circuit voltage distortion in salient pole synchronous generators with damper windings. It then proceeds to examine the role of damper bars in the level of distortion. The simplified finite element method employed is inclusive of eddy current effects, dynamic field current and full interaction of all MMF sources. It allows accurate total harmonic distortion values to be calculated approximately 25 to 30 times quicker than a fully rotating finite element simulation. Tests have been conducted on eight built machines and results compared to both analytical and alternative finite element methods. The proposed mehtod has an average reduction in error of 55%, compared to an existing analytical method. The presence of damper bars and their position within the pole face is examined, and shown to have a large influence over the level of total harmonic distortion produced.

Senkron Generatörlerde Farklı Stator Oluk Yapılarının Uç Gerilimine Etkisinin Sonlu Elemanlar Yöntemi ile Analizi

“…Stator kısmında yapılan bu düzenlemeler generatörün motor konumunda çalışması sırasında daha düzgün moment üretilmesini de sağlamaktadır. Bununla birlikte rotor kısımlarına sincap kafes sistemi ve kutup ayaklarına ise damper sargıları yani kısa devre çubukları yerleştirme gibi önlemler de literatürde sıklıkla karşılaşılan bir durumdur [6]. Asenkron motorlarda ise rotor oluklarının belirli bir açıda eksenden kayık (eğik) olarak yapılması moment vuruntularını azaltmaktadır [7][8][9].…”

Sensitivity analysis for performance and power density improvements in salient-pole synchronous generators

“…With the fast development of the computing resources, finite element method is used to analyse the effects that various damper winding configurations have on the voltage THD and associate damper bar losses. In particular, [12] shows that some damper cage features have a significant effect on the THD and the overall efficiency of a machine. A new damper winding topology is proposed in [7] aiming at reducing the damper cage losses whilst keeping the THD of the no-load voltage under acceptable limits.…”

Vibrations in Electric Machine with Permanent Magnets during Unsymmetrical Operation Point

“…For that reason they are widely used in the renewable energy sector as a source of electrical energy. Synchronous generators described in this paper are manufactured as three-phase symmetrical machines [2,3,4]. However, sometimes the needs of consumers of electricity are different, one such example is the synchronous generator used as a source of voltage in the testing station for voltage and current transformers testing.…”