How knows the maximum allowance THD for off-grid network in distributed generation which is supply by gas turbine? Like (1) Comment (6) Follow Reply Privately 3 days agoCommentsBruno Ricardo Marqueslikes this6 comments JimJim PhippsTrekeng.comYou can use guidelines taken from various power quality standards.

For low voltage, power distribution, where voltage sensitive loads are mixed with harmonic producing loads like rectifiers in motor drives, 5% THDv is a typical guideline to follow.

For low voltage, dedicated systems, where sensitive loads are not part of the mix, higher distortion might be acceptable. A guideline of 8% THDv might be considered.

Check with the manufacturer of the gas turbine alternator to verify their design for harmonic losses. Typically, alternators are designed based on a maximum temperature rise. When voltage and current distortion levels are high, the harmonic losses in the alternator will be greater. This will cause the machine to reach its temperature rise limit at a lower loading level than rated. If you intend to operate the alternator at its rated values and get maximum service life from the insulation system, then the system distortion levels will need to be controlled to be less than manufacture's design limits. Like Reply privately Flag as inappropriate 2 days ago SaeedSaeed RadmaneshOffshore Platform Engineeringthank a lot Dear Jim for your great comment,Actually in this DG micro-grid we have a controlled heater which made around 4% harmonic distortion and it caused to rapture the gas turbine coupling, so refer to IEEE 519 for below 69Kv , THD is 5% , that's I interested about, but I didn't check the GTG recommended THD.for microgroove should consider other THD rate or standard? Like Reply privately Flag as inappropriate 2 days ago HosseinHossein VahediHead Of Electrical Substation & Power Plant Interface Department at Moshanir Power Engineering ConsultantsAccording to IEEE standard it can be less than 5% in normal area. Like Reply privately Flag as inappropriate 2 days ago Didik ErfanDidik Erfan FahrudiGG Field Development Project at Pertamina Hulu Energi ONWJ LtdYou should check individual harmonic distortion, sometime more than 5%. Like Reply privately Flag as inappropriate 2 days ago Narendra BabuNarendra Babu NityanandamFreelance Consultantpl refer IEEE 519 - 2014 Like Reply privately Flag as inappropriate 1 day ago AhmadAhmad Ali KhanConstruction Professionalabout that i have no sufficient information ,i think Mr Jim have a good knowledge about that