Study on Fast and Reliable Power System Operation Control Using Parallel and Cooperative Distributed Problem Solving

本研究旨在利用知识工程中的并行分散处理技术，减少电力系统控制问题的推理时间，使求解更准确、更可靠。(1)利用面向对象的知识表示方法，在McIntosh计算机上开发了一种新型的过载制动控制系统。分别采用集中式、分布式和层次式问题求解技术测试了考虑并行处理的系统性能。在此，潮流计算也被并行执行，这使得大规模电力系统中求解问题所需的总处理时间大大减少。通过对离散事件工程问题求解技术的比较表明，存在最优的子系统数目，并且分层问题求解系统优于分布式问题…系统更多的m解题系统。此外，子系统所属局部处理机之间的通信时间对确定大系统的分解模式起着重要作用。(B)在McIntosh计算机上用Common LISP语言开发了一个故障区段辅助估计系统。该辅助系统利用本文开发的因果网络和动作继电器、跳闸断路器的动作时间信息进行推理。与传统的基于规则的产生式系统相比，该系统考虑了并行处理，使得非常快速和准确的故障区段估计成为可能。此外，对于继电保护和断路器的错误信息或遗漏信息，该系统对采取必要的对策具有很强的鲁棒性。此外，还研究了用Petri网代替因果网络来提高推理的并行性，取得了较好的效果。较少

This research aims at reducing the inference time and making the solution more accurate and more reliable in power system control problem by using parallel decentralized processing techniques in knowledge engineering. The following results are obtained from this study :(a) A new type of overload refief control system is developed on a McIntosh computer using object-oriented knowledge representation. Performances of the proposed system taking into account parallel processing are tested by using centralized, distributed and hierarchical problem solving techniques respectively. Here, load flow calculation is also excuted in parallel, which leads to a large reduction of the total processing time required for problem solving in a large-scale power system. It is made clear from the comparison of dwe problem solving techniques that there exists the optimal number of subsystems into which the whole system is divided and that hierarchical problem solving system is superior to distributed proble … More m solving system. In addition, it should be noted that the communication time among local processors belonging to subsytems plays an important role in determining the decomposition pattern of the large-scale system.(b) An assisting system for fault section estimation is developed on a McIntosh computer using Common Lisp language. The proposed assisting system uses cause-effect network which is developed here and operating time information of actuated relays and tripped circuit breakers for inference. Taking into account parallel processing, the proposed system makes the very rapid and correct fault section estimation possible compared with the conventional rule-based production system. Furthermore, it makes the proposed system robust to taking necessary countermeasures against erroneous or missing information of relays and circuit breakers. In addition, the use of Petri-net instead of cause-effect network is also investigated to improve the parallelism of inference and good results are obtained. Less