Evaluation of Voltage Ancillary Service by Voltage Regulating Apparatus

Abstract

The necessity of quantitative evaluation of voltage ancillary service (V-AS) is increasing with the deregulation of electric power supply. So far, the authors proposed the quantitative contribution to V-AS index based on the voltage stability sensitivity relative to minimal change of reactive power supplied by voltage regulating apparatus. In the present paper, we propose a new contribution index based on the eigen-analysis and participation factor, which indicates the weakness degree of voltage stability. The proposed contribution index is examined its validity through the calculation for generators and capacitors on the IEEJ WEST 30-machine system model.