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AC machine systems : mathematical model and parameters, by Jingde Gao

By Jingde Gao

"AC computing device platforms" stresses either research equipment and working performances of AC desktop platforms, together with variable pace force method of AC machines with strength electronics and keep an eye on units, strength power process composed of AC machines and tool traces, certain computing device procedure with targeted machines and certain a lot, electrical desktop approach inclusive of AC machines and excitation units. in response to a unmarried coil, the Multi-Loop concept is carefully defined, and examples of ways to take advantage of the recent method are offered. This booklet presents a brand new approach for interpreting the AC desktop platforms. This e-book is designed for the researchers and postgraduates within the box of electrical machines and keep watch over. it is also a reference e-book for comparable technicians.

This ebook is written in reminiscence of Professor Jingde Gao, past-president of Tsinghua college, Member of chinese language Academy of Sciences. one other authors, Linzheng Zhang and Xiangheng Wang either are Professors in electric Engineering Dept. of Tsinghua University.

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Extra info for AC machine systems : mathematical model and parameters, analysis, and system performance

Sample text

After obtaining the mutual inductances between stator single coil and excitation winding or damping loop, the mutual inductance between stator loop and rotor loop consisting of them will be obtained easily. Finally, it should be pointed out that in the calculation of the self inductance of excitation winding, mutual inductance between excitation winding and damping loop, and mutual inductance between excitation winding and stator loop as in front, all excitation winding is considered as series or parallel connection.

3 Direct axis and quadrature axis damping winding of salient pole synchronous machine In practical salient pole synchronous machine, there are many damping bars, accordingly, there are many direct axis damping windings 1d , 2d ," , nd and many quadrature axis damping windings 1q, 2q," , nq. Therefore, normally two methods 25 AC Machine Systems are adopted for the analysis and calculation of damping winding; one is to calculate the parameters of each damping winding in terms of practical distribution of damping windings, the other is to replace all damping winding loops by a direct axis and a quadrature axis equivalent damping windings.

10) where the unit of J is mechanical radian; the unit of t is s ; the unit of Tm and Te is N ˜ m; the unit of J is kg ˜ m 2 . 11) where P is the pole pair number of the electric machine. In practice, per-unit value is adopted mostly in the above formula. Generally, the base value of torque is selected as TG S N u 103 (N ˜ m) 2Sn 60 where S N is the normal apparent power of the electric machine (kV ˜ A); n is synchronous speed (rpm). 1 Generally, the base value of time is selected as tG (s), it corresponds to 2Sf the time when the rotor of the synchronous machine rotates by one electric radian at synchronous speed.

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