New Effective Application of SMES in Distributed Power System

近年来，分布式发电机（DG：风力发电、太阳能电池系统、微型燃气涡轮机系统等）被引入到负荷系统侧，并且电力系统的配置，特别是负荷系统（需求侧系统）变得复杂。负荷系统的电压调节和稳定问题将成为电力系统运行中需要解决的重要问题。从在线数据掌握负载系统侧的运行状况并评估负载系统的动态特性变得重要。为了提高电能质量，将在负荷系统侧引入小型SMES（微型SMES）。本研究提出了SMES在包含分散发电机的分布式电力系统中的新应用，提出了利用SMES从在线数据估计包括DG在内的负荷系统运行状态。超导磁储能系统可以产生一个任意模式的小功率干扰， ...更多信息 对电力系统运行工况影响小的电力系统。对电力系统中因小功率扰动而产生的小功率振荡进行观测和分析，掌握运行工况。基于这些考虑，在模拟式电力系统仿真器和模拟器用SMES模型上进行了基本实验。利用超导磁储能系统在线测量了不同运行条件下系统的特征值，如DG数量、潮流、负荷侧的分布等。以负荷线功率波动与给定SMES功率调制为例，通过谱分析和模型辨识方法得到了负荷线功率波动与SMES功率调制之间的传递函数，并证实了SMES功率控制可以实现微电网在上层系统故障时的独立运行，并平滑地重新同步到上层系统。利用超导磁储能系统的小功率调制信号，可以成功地实现孤岛运行的检测。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