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励庆孚, 刘志
电工技术学报,2000,15(4):14-18,-0001,():
-1年11月30日
应用磁荷面密度及磁化强度的有关理论, 建立二者混合的σ*-M积分方程模型,使用三次样条插值技术对非线性方程进行迭代求解。利用该法对TEAM PROBLEM 13进行了计算验证,磁场的计算值和测试值吻合较好,证明了该方法的有效性。
磁荷面密度, 磁化强度, 积分方程, 三维非线性磁场
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【期刊论文】A Controllable Reactor of Transformer Type
励庆孚, Mingxing Tian, Qingfu Li, Senior Member, IEEE, and Qunfeng Li
,-0001,():
-1年11月30日
This paper clarifies the operating principles of a controllable reactor of transformer type (CRT). In nature, a CRT is equivalent to a multi-winding transformer for which the low-voltage windings (control windings) operate at short-circuited states in turn. This kind of reactor possesses such advantages as smooth power regulation, low current harmonic content, and fast response. Taking account of the coupling of the control windings, this paper examined the current harmonic content for the work winding by Fourier series decomposition, and thus derived the current harmonic coefficients. Based on the solution of the branch current equation of a multi-winding transformer, and introduction of the concept of equivalent winding impedance, a polygon-type equivalent circuit is proposed for a multi-winding transformer. Subsequently, formulae for the branch impedances of the equivalent circuit are presented. According to the harmonic content constraints, the number of control steps is determined. Then, by combining the MMF and branch current equations, an expanded equation about the winding currents and current-limiting reactances is obtained. According to the feature that the control windings are short-circuited in turn, the current-limiting reactances are calculated for each control winding step by step. At last, based on the proposed equivalent circuit for a multi-winding transformer, a simulation model for a CRT is fabricated with MATLAB/SIMULINK/PSB. The simulation results confirmed the presented work, which underpins the further analysis and design of a CRT.
Controllable reactor,, current-limiting reactor,, equivalent circuit,, harmonics analysis,, simulation,, transformer type.,
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【期刊论文】Analysis of Polyphase Brushless Exciter
励庆孚, Xiaochuan Jia, Member, IEEE, Qingfu Li, Senior Member, Jih-Sheng Lai, and Byeong-Mun Song
,-0001,():
-1年11月30日
This paper presents modeling and simulation of the operation of an 11-phase brushless exciter. The analytical method is based on Kron's tensor method, which is developed for dealing efficiently with the time-varying topology of an exciter circuit during a digital computer solution. The inductances, which are variable with rotor position, are calculated by the two-dimensional finite-element method. The detailed information (normal and fault cases) on the performance of the brushless exciter is obtained, which is beneficial to design engineers. The approach is suitable for both normal and fault cases. As a result, agreement of calculated values with test results shows the validity of the method of calculation and theoretical analysis presented.
Brushless exciter,, 11 phase,, polyphase,, polyphase brushless exciter.,
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励庆孚, Qingfu Li and Fei Wang
LEEE TRANSACTIONS ON MAGNETICS, VOL. 25, NO.2, MARCH 1989,-0001,():
-1年11月30日
The current simulation method is presented for calculating three dimensional magnetic field of superconducting ac generator. The method represents the influence of the boundaries by a large number of current loops appropriately positioned at a distance behind the boundary surface so that the boundary conditions on the actual surface of the boundaries are satisfied. The calculated results obtained for the model of the superconducting ac generator are proved to be closely consistent with the measured values.
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励庆孚, 贾小川
中国电机工程学报,1996,16(2):106-109,-0001,():
-1年11月30日
本文采用基于张量电网络所建立的数字仿真模型,对11相无刷励磁机进行了仿真分析。此模型适于处理无刷励磁机所组成的时变网络系统。所需电感参数用二维有限元法算得。最后得到11相无刷励磁机的详细仿真结果,并进行了验证。
无刷励磁机, 数字仿真, 电网络
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