As per Oman Standard for Solar PV project on grid , the system should meet the bellow technical requirements at the Point of connection (POC ) :

– The frequency at the POC stays within the range of 47,5Hz to 52,5Hz.
-The voltage at the POC stays within the range 85% to 110 % of the rated voltage.
– Total Harmonic distortion (THD) is:  3% at (as per ASPR) ,or as per DISCO
– Short circuit (Is): 6% of Max switch Capacity.

In case that THD exceed the limit, the electrical filter should be applied after submitting the electrical simulation study.

Please refer OES standard in ASPR

Authority for Public Services Regulation
Muscat Electricity Distribution Company (MEDC)
Mazoon Electricity Company S.A.O.C
Majan Electricity Company SAOC
Dhofar Power Company SAOC
Nama Group
Petroleum Development Oman