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Publication Title | Rotor angle stability analysis of a distributed generator connected to distribution network

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Journal of Electrical and Electronics Engineering Research Vol. 2(5), pp. 107-113, November 2010 Available online at http://www.academicjournals.org/jeeer

ISSN – 2141 – 2367 ©2010 Academic Journals

Full Length Research Paper

Rotor angle stability analysis of a distributed generator connected to distribution network

T. Ananthapadmanabha1*, A. D. Kulkarni1, ManojKumar Pujar2, H. Pradeep1 and S. Chetan1

1Department of Electrical and Electronics Engineering, National Institute of Engineering, Mysore, India. 2Gulbarga Electricity Supply Company (GESCOM), Bellary Division, India.

Accepted 19 August, 2010

This paper describes the rotor angle stability analysis of a distributed generators connected to a 10 kv distribution network consisting of wind generators, microturbines, and CHP plants. The distribution network being modeled in Matlab/Simulink/Sim Power-system takes into account detailed dynamic models of the generators. Fault simulations at various locations are investigated. For the studied cases, the critical clearing times are calculated and the influence of the inertia on the CCT of DG’s is analyzed. Results obtained from several case studies are presented and discussed.

Key words: Distributed resources, distribution system, dynamic modeling, critical clearing time, rotor angle stability, power system protection.

INTRODUCTION

Distributed power generation is any small-scale power generation technology that provides electric power at a site closer to customers sites to meet specific customer needs, to support economic operation of the existing power distribution grid, to meet an ever growing demand for electrical energy. Currently, intensive efforts are made to utilize renewable energy sources (such as wind) as well as nonrenewable sources (such as gas turbine, high- efficiency small-scale Combined Heat and Power (CHP) schemes) to generate electric power. The generators are mostly integrated into utility networks at distribution voltage level and they are commonly referred to as “distributed generators” (DGs). Various investigations have shown that DGs could affect negatively the host distribution network in a number of ways. This paper deals with rotor angle stability analysis of distributed generators. The novelty of this paper is in the analysis of rotor angle stability of DG’s at distribution level, where stability problems were typically not an issue due to the passive nature of distribution networks (DNs) of the past. However, nowadays, the situation is changing due to the introduction of DGs. In this paper, critical clearing times

*Corresponding author. E-mail: drapn2008@yahoo.co.in

(CCTs) of DGs were determined for a 10-kV test distri- bution network with DG’s, where three-phase faults at different network locations have been analyzed. Such CCT is determined by the onset of a DG becoming unstable, parameter influencing the CCT’s is analyzed and relation between that parameter and CCT is deter- mined. Results obtained from several case studies are presented and evaluated. The general conclusion of this paper is that problems with transient stability of DG might occur at the distribution network level, and therefore, this issue has to be taken into account when new DG units are to be connected to the network. It is also concluded that DG under voltage protection settings can be deter- mined based on stability analysis, and this is an important issue as some types of DG units can remain connected (fault ride through) and support the grid during and after a disturbance.

Concept of critical clearing time and rotor angle stability

As in (IEEE report, 1982) the critical clearing time is defined as, “If a particular disturbance includes the initiation and isolation of a fault on a power system, the critical clearing time is the maximum time between the

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