Open Access
IET Generation, Transmission and Distribution, volume 12, issue 22, pages 5928-5938
Generalised‐fast decoupled state estimator
Yanbo Chen
1
,
Zhi Gang Zhang
1
,
Hengfu Fang
2
,
Yansheng Lang
2
,
Jin Ma
3
,
Shunlin Zheng
1
2
China Electric Power Research InstituteRoad No. 15Qinghe XiaoyingBeijingPeople's Republic of China
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Publication type: Journal Article
Publication date: 2018-09-07
scimago Q2
SJR: 0.787
CiteScore: 6.1
Impact factor: 2
ISSN: 17518687, 17518695
Electrical and Electronic Engineering
Energy Engineering and Power Technology
Control and Systems Engineering
Abstract
Nowadays the fast-decoupled state estimation (FDSE) is widely used in almost every power system control centre. FDSE is effective and efficient for most transmission systems but it may not converge for systems with a large ratio of branch resistance to reactance (R/X); meanwhile the branch current magnitude measurements (BCMMs) cannot be reliably used in FDSE, thereby limiting its applications especially for the distribution systems where BCMMs abound. In this study, the above two problems have been addressed by transforming all measurements so that they can be classified as quasi-real power measurements and quasi-reactive power measurements, leading to a generalised FDSE (GFDSE) with a solid theoretical foundation. The formulation of GFDSE is based on only the assumption, rather than three assumptions used in FDSE. As a result, GFDSE has good adaptability to transmission systems as well as distribution systems; additionally, BCMMs can be reliably used in GFDSE. Case studies based on IEEE benchmark systems and a real grid of China demonstrate that the proposed GFDSE has very good convergence properties for transmission systems and distribution systems; and at the same time, the proposed GFDSE is also superior to FDSE in terms of computational efficiency under almost all cases.
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