Outline

  • Abstract
  • Keywords
  • I. Introduction
  • II. Phasor Measurement Unit (pmu) Technology
  • III. Pmu Placement Problem Formulation
  • IV. Results and Discussion
  • V. Conclusion
  • References

رئوس مطالب

  • چکیده
  • کلید واژه ها
  • 1. مقدمه
  • 2. تکنولوژی واحد اندازه گیری فازور (PMU)
  • 3. فرموله سازی مسئله جایابی PMU
  • الف. جایابی بهینه PMU با بی نهایت کانال
  • ب. الگوریتم پیشنهادی برای جایابی بهینه PMU
  • گام 1. شناسایی شبکه شعاعی اولیه
  • گام 2. در نظر گرفتن باس هاش شاخه به عنوان شبکه ثانویه
  • گام 3. جایابی PMU در شبکه های اولیه و ثانویه
  • 4. نتایج و بحث
  • 5. نتیجه گیری

Abstract

Phasor Measurement Units (PMUs) have potential role in power system monitoring, protection and control. PMUs directly measure and provide synchronized measurements of voltage and current phasors at various system locations. This offer numerous possibilities for ascertaining information related to the state and health of a power system.

The aim of an optimal PMU placement is to provide minimal PMU installations to ensure complete observability of a power system. Several methods have been proposed in the past and significant work has been carried out till date to ensure observability of transmission networks. Penetration of new technologies at distribution level raises concern about system operation. These concerns can be addressed by synchrophasor applications. Hence, PMUs play an equally important role at distribution level also. Since, distribution systems are large in size as compared to transmission systems, the algorithms reported may take longer computational time for optimization. Hence, an approach towards optimal PMU placement for distribution system is required. This paper presents a simple and effective algorithm of PMU placement for distribution networks that saves considerable amount of computational time. The proposed algorithm is tested on IEEE-13, 34 and 123 Node Test Feeders and results show that computational time is considerably reduced without significantly affecting the number of PMUs.

Keywords: - - -

Conclusions

A simplified and effective approach of PMU placement for large-scale distribution systems is presented in this paper. The proposed algorithm finds an optimal solution to placement problem by decomposition of network into two sub-networks. Since the problem size is reduced due to splitting into two stages, this decomposition reduces the computational time required to obtain optimal locations of PMUs compared to the frequently used Integer Programming method considering the whole network. It can be concluded that the proposed algorithm provides an effective solution to observability of a large-scale distribution system.

PMU placement problem in practical situations involve more than full observability and minimizing cost. Requirements from the specific application should be taken into account, for example influence of PMU malfunction, communication failures, measurement redundancy and uncertainty, number of measurement channels, environmental conditions and existence of other associated devices. These factors may be considered for further investigation and development of placement strategies to generate more practical solutions to placement problem.

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