电力系统模拟试验系统的物理现象分析

鉴于电力技术的高速发展对物理模拟试验系统提出了更多新的要求,提出了新型电力系统模拟试验系统,分析了系统的各部分主要功能,并基于对模型系统与原型系统一致性的理论分析,以典型的单机—无穷大系统为例,分析了该系统在试验过程中出现的物理现象和参数变化过程。结果表明,线路发生两相故障时,故障超前相和落后相电流的大小关系取决于故障前发电机向系统输送的负荷大小;保持发电机电势不变,增加有功功率输出,当线路阻抗大于发电机同步电抗时发电机处于迟相运行,反之则处于进相运行。

Physical Phenomenon Analysis of Simulation Experiment of Power System

The rapid development of the power technology has puts forward more new requirements for physical simulation experimental system. The author designed a new structure of power system simulation experimental system and analyzed the main function. Based on the theoretical analysis of the consistency of model system and prototype system, the physical phenomenon and parameters for the experimental process of a typical single machine infinite bus system has been analyzed. The results show that for the phase to phase fault in lines, the current relationship between phase lead and phase delay depends on the output power of the generator; if the line impedance more than synchronous reactance, the generator will export reactive power while improve the real power output at the same generator voltage; conversely, the generator will absorb reactive power.