New Effective Application of SMES in Distributed Power System

近年来，分布式发电机组（dg：风力发电、太阳能电池系统、微型燃气轮机系统等）被引入到负荷系统侧，使得电力系统特别是负荷系统（需求侧系统）的配置变得复杂。负载系统的电压调节与稳定问题将成为电力系统运行中需要解决的重要问题。从在线数据中掌握负荷系统侧的运行状态，对负荷系统的动态特性进行评价具有重要意义。为了改善电能质量，将小型中小型企业（micro-SMES）引入负载系统侧。提出了中小企业在包括分散发电机在内的分布式电力系统中的新应用。在本研究中，提出了利用中小企业从在线数据中估计包括dg在内的负荷系统运行状态。中小企业可以对电力系统产生任意模式的小功率扰动，对电力系统的运行状态影响较小。对电力系统中由于小功率扰动而产生的小功率振荡进行了观察和分析，以掌握运行状况。基于此，在模拟型电力系统仿真器和仿真器模型SMES上进行了基础实验。利用SMES在线测量了系统在各种工况下的特征值，如dg数、潮流、负载系统侧内剖面等。例如，利用谱分析和模型识别方法获得了负载线功率波动与给定中小企业功率调制之间的传递函数。验证了微网在上位系统故障时的独立运行，通过中小微电网的功率控制，可以顺利地实现对上位系统的重新同步。孤岛操作的检测可以成功地实现使用一个小的有源功率调制信号从中小企业。少

In recent years, the distributed generators (DGs : wind power, solar cell system, micro gas turbine system and so on) are introduced to the load system side, and the configurations of the electric power system, especially the load system (the demand side system) has been complicated. Voltage regulation and stability problems on the load system may become more important item to clear in power system operations. It becomes important to grasp operating conditions of the load system side from on-line data and to evaluate dynamic characteristics of the load system. Small sized SMES (micro-SMES) will be introduced to the load system side in order to improve the power quality. New application of the SMES was proposed in this study in the distributed power system including dispersed generators.In this study, it was proposed to estimate the load system operating state including DGs from on-line data by use of the SMES. The SMES can generate a small power disturbance of arbitrary patterns to the … More power system with small influence on the operating conditions of power system. Small power oscillation in the power system due to the small power disturbance are observed and analyzed to grasp operating conditions. With these considerations, basic experiments were carried out on an analogue type power system simulator and a model SMES for simulator. Eigen-value of the system with various operating conditions, such as number of DGs, power flow, profile inside the load system side are measured on-line by use of SMES. A transfer function between load line power fluctuation and given SMES's power modulation, for example, is obtained using a spectral analysis and a model identification method.It was also confirmed that the independent operation of the micro grid at a fault in the upper system can be performed and re-synchronized to the upper system smoothly by use of SMES power control. Detection of the islanded operation can be successfully achieved by use of a small active power modulation signal from SMES. Less