Control strategies for power system in island operation

conference paper

English

Supervisory active power and frequency (P-f) control together with reactive power and volt-age control (Q-V) represent two main and usually separated processes to keep system indicators (frequency and voltage) within permissible limits. Generally, the hierarchical structure of both domains is very similar. It contains local primary control, secondary control and tertiary control. This system ensures coordination of active and reactive power production and optimization. This paper deals with particular cases of P-f and Q-V control strategies in island operation, when a part of the system is electrically separated from the main interconnected system. This operation condition occurs rarely on transmission system level, however the control systems on all levels should be adjusted properly and transmission system operators should have prepared a plan to manage such extraordinary situation. Different possibilities for cooperation of secondary and primary controls are investigated and evaluated. All possibilities mentioned thereinafter are simulated by dynamic model of power system. Special attention is paid to study cases with successful strategies, which represent secure transition from normal to island operation mode. Investigated cases lead to recommendation to operate primary controls independently and decentralised. In case of situation when system indicators (frequency, voltage) are out of their limits, turbine governors should be switched to proportional speed control and excitation control to terminal voltage control.

Central east europe Dynamic models Island operation Power-system control Primary and secondary controls

HRUSKA, Z.; MÁSLO, K.;

28. 5. 2013

Kouty nad Desnou, Czech republic

978-1-62993-918-6

14th International Scientific Conference on Electric Power Engineering (EPE)

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