Static Security Enhancement via Optimal Utilization of Thyristor Controlled Series Capacitors

The annual number and cost of voltage sags were determined for five Finnish distribution companies. The method of fault positions was applied for the calculation of voltage sag frequency. The economic consequences were assessed by multiplying the sag frequency and cost by the number of customers. The cost of a single sag was taken from a survey that had been carried out in three Nordic countries in the mid 1990s. The paper proposes a method for retrieving sag-related information from statistics originally prepared for other purposes. In addition, the paper provides an estimate of the total annual sag-related cost for each of the companies considered in this study and for each customer category. The total cost per company appeared to be much higher than had generally been assumed.

[1]  Enrico Tironi,et al.  Power quality costs and upgrading solutions: the energy centre , 2000, Ninth International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.00EX441).

[2]  A. R. Dettloff,et al.  Power quality performance component of the special manufacturing contracts between power provider and customer , 2000, Ninth International Conference on Harmonics and Quality of Power. Proceedings (Cat. No.00EX441).

[3]  Matti Lehtonen,et al.  Characteristics of earth faults in electrical distribution networks with high impedance earthing , 1998 .

[4]  M.H.J. Bollen,et al.  Voltage sag coordination for reliable plant operation , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[5]  Math Bollen,et al.  Understanding Power Quality Problems: Voltage Sags and Interruptions , 1999 .

[6]  Math Bollen,et al.  Stochastic prediction of voltage sags in a large transmission system , 1998, 1998 IEEE Industrial and Commercial Power Systems Technical Conference. Conference Record. Papers Presented at the 1998 Annual Meeting (Cat. No.98CH36202).