【摘要】 超高压发电机是一种不需要升压变压器可直接与电网相连的结构全新的发电机。本文采用场路耦合时步有限元方法对超高压发电机的对称和非对称空载短路瞬态过程进行仿真分析。给出超高压发电机三相短路和两相短路时电枢电流的最大值。根据IEEE-115-2002标准,由空载三相和两相突然短路的电枢电流曲线计算了瞬变电抗、超瞬变电抗和时间常数及负序电抗。更多还原

【Abstract】 A Powerformer can be connected directly to a grid without step-up transformers, with a novel structure. A two-dimensional (2-D), field-circuit coupling, time-stepped finite-element method is used to model and simulate saturated symmetrical and asymmetrical short-circuit test at no-load on the Powerformer. According to IEEE Std.-115-2002, the d-axis transient reactance and time-constants are calculated from three-phase short-circuit tests, while the negative-sequence reactance is derived from the line to line short-circuit test.更多还原