Development of power quality control procedures and standards to control the connection of non-linear loads in electric power systems

The rise of new electric customers with type of load of iron smelting electric furnace has made PLN prompted to prepare adequate power supply, improved reliability of electricity supply and fix the rules of on standards and control procedures of electric power quality on customer´s side. Load type iron electric furnace or iron smelters, has been known to cause power quality problems, especially harmonics, which may cause disturbance to other consumers or to electrical power system. Therefore, procedures to supervise and to control customer´s electrical load which causing power quality problems need to be developed and implemented to maintain the power system from voltage and current harmonic distortion problem and the influence of other power quality problems. Also, power quality standard as the major rules regarding the limitation of power quality distortions has to be established and consistenly implemented including on the letter of power purchase agreement between utility and electricity customer. This paper shows the efforts of PLN to develop supervision and control procedures and power quality standards for limiting the distortion power quality and also the preparatory steps for applying the rule on each electric power customer´s. Implementation strategies for applying the power quality limitation rule to both news customers and existing customers are described in detail.