Development of power system analyzers for evaluating stabilization control in electric

本研究旨在开发用于直流输电系统稳定控制的电力系统分析仪。在2003年的研究项目中，我们获得了以下结果：电力系统分析仪中发电机模型的开发和评估：我们在MATLAB/Simulink中通过方框图建模同步发电机。我们特别讨论了基于动力系统理论的单发电机-无限母线系统的暂态动力学，并用我们的发电机模型来表示。由此得出结论，动力系统理论适用于电力系统分析仪实验结果的评价。模拟交流传输线模型的评估：我们评估了电力系统分析仪中与交流传输线模型相对应的电抗器的物理量。至此，我们完成了电力系统分析仪的几个基本元件的开发。混合型电力系统分析仪的开发和评估：我们将发电机模型和交流线路模型与交流/直流板、电流传感器和功率放大器相结合。因此，我们开发了一种新型的混合型电力系统分析仪。此外，还对仿真器进行了若干实验测试。交直流电力系统暂态稳定性的解析研究：推导了暂态稳定边界的解析判据，阐明了考虑交直流输电功率关系的交直流系统的约束动力学。

This research aims to develop power system analyzers for stabilization control of electric power systems with dc transmissions. In the research project term 2003, we obtained the following results.1.Development and evaluation of generator models in power system analyzers: We modeled synchronous generators via block diagrams in MATLAB/Simulink. In particular we discussed transient dynamics of a single generator-infinite bus system, which is represented with our generator models, based on dynamical system theory. It was thus concluded that dynamical system theory is applicable to evaluate experimental results of power system analyzers.2.Evaluation of analog ac transmission line models: We evaluated physical quantities of reactors that correspond to ac transmission line models in power system analyzers. Hence we have finished the development of several elements for power system analyzers.3.Development and evaluation of hybrid-type power system analyzers: We combined generator models and ac line models with ac/dc boards, current transducers and power amplifiers. As a result, we developed a new hybrid-type power system analyzers. In addition the simulator was evaluated with several experimental tests.4.Analytical studies on transient stability in ac/dc power systems: We derived an analytical criterion for transient stability boundaries, and clarified constrained dynamics of ac/dc systems taking the power relation between the ac and dc transmissions into account.