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Fundamentals of Electrical Drivess - Chapter 6

Chapter 6 SPACE VECTOR BASED TRANSFORMER MODELS Chương này xem xét một phần mở rộng của mô hình biến áp một pha (ITF) một phiên bản không gian hai giai đoạn vector dựa trên. Việc giới thiệu một mô hình hai (ITF) giai đoạn có tính hướng dẫn như một công cụ để di chuyển theo hướng khái niệm IRTF quay biến cái gọi là 'lý tưởng' ', đã tạo cơ sở các mô hình máy cho cuốn sách này. Đọc được nhắc nhở về một thực tế là một mô hình hai giai đoạn là một phương pháp thuận tiện. | Chapter 6 SPACE VECTOR BASED TRANSFORMER MODELS 6.1 Introduction This chapter considers an extension of the single phase transformer ITF model to a two-phase space vector based version. The introduction of a two phase ITF model is instructive as a tool for moving towards the so-called ideal rotating transformer IRTF concept which forms the basis of machine models for this book. The reader is reminded of the fact that a two-phase model is a convenient nwM of representing three-phase systems as was discussed in section 4.6 on page 89. The development from ITF to a generalized two inductance model as discussed forthesingle phase model see chapl.cr3 is almost identical Inrihe two-phaeemgdek Cs nsuc ticnl.lgsil is notinsSractivn to repeat this prornsshare. Instsdd emphasic ns acedm dfs cha cror the development ofaSwn-phasa sphcevnntor baacdfl F symbhkcandgnneric model. 6.2 Developmen0 of aspscevector Hissed ITI- model The process of mouccg hni d sifgie phe-jeSTF meSsl toa space vMor based version is 0 061 sf figures. mldnCis modl-csto a two-phase . 1 fta-en is s._ A comparison between the single phase figure 3.1 and two-phase figure 6.1 shows thalthese are now two windings on the primary and two on the secondary sideof 6e fiansformpr.Thephmery andaecondrrnerlpha winding pair are orthogonal to the beta winding pair. The number of effective primary and secondary turns Sseqdf-toss 1 0inn-n stsef cm dg se- lscil.lhcwim.es s are shown in symlndicfosmm i r df rls hswwnCTncKi-stàngme maiosmcsarc located. The primach andsccoedaryfhatc wmche ase asnumcd to be sinusoidally distributed. A cHscrissgiii on 11 01 1101 sinusoidallyd rilaut 150 FUNDAMENTALS OF ELECTRICAL DRIVES Figure 6.1. Two-phase physical transformer model windings and effective number of turns is given in appendix A. The currents in the primary and secondary windings are defined as ila i 3 and Ì2a Ỉ2f3 respectively. A complex plane with a real and imaginary axis is also introduced in figure 6.1. Also shown in this