Hello Guilhermebr

If you are looking to use an active filter for an "off grid" application, then you need to be careful about what, how and why.
Active filters operate in much the same manner as a reverse connected VFD in that they usually have a three phase active bridge using PWM waveforms with special harmonic software to create an output waveform that cancels any harmonics that the load generates. The output of the active filter usually comprises an LCL filter to provide an attenuation to the high frequency switching waveform so that only the low frequency currents are passed through to the supply.
The problem is, that if the impedance of the supply is quite high at the higher frequencies, then the small switching currents that pass through the LCL filter can equate to a significant high frequency voltage that can cause interference with the operation of other equipment on the supply.
I have seen significant voltages in the order of 6 - 10KHz caused by active filters on rural (high Z) networks.
I believe that it is also possible for instability of the control algorithms to occur if the inductive reactance is too high. I have not experienced this my self, but there have been reported cases from the field.

Mark Empson
Advanced Motor Control Ltd The original question was extremely vague. But, even so, if your "off-grid" source powers the "M" and the noisy load is connected to the "G" the rest of the system on the "M" side will not see any harmonics from the "G" side. It would be nice if folks asked the complete question up front with all of the relevant details (this OP is far from unique in that regard). Maybe frame some boundaries around the question. As asked, my M-G set is clearly the "best". Maybe not the most practical. Maybe not the most economical. Maybe overkill for the application. But clearly the "best".

Perhaps some realistic bounds could be established and the full scope established. Maybe?

I'll see your silver lining and raise you two black clouds. - Protection Operations

13 - Harmonics and generators ' what do you need to know?

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Learn how harmonics interact with generators increasing voltage distortion to ensure loads operate correctly on the generator or utility source || Eaton, Power Quality, Dan Carnovale explains, Harmonic FAQ, Power Systems Experience Center, IEEE-519 Eaton's Harmonic Frequently Asked Question's FAQs collection of videos hosted by Dan Carnovale can help individuals from all different levels of education understand what harmonics are and explain many different solutions for mitigating harmonics on an electrical power system. A high level of total harmonic voltage or current distortion on an electrical power system can cause many problems and it is important to understand how harmonics are generated so they can be reduced or mitigated. What causes harmonics and where do harmonics come from in a power system? Harmonics are generated from non-linear loads that typically include power electronics such as variable frequency drives (VFD) and LED lights. Current harmonics cause excess heating of transformers and cables and damage electrical equipment and voltage harmonics cause mis operation. There are many harmonic solutions including harmonic load solutions and system harmonic solutions to reduce harmonic currents. Calculating harmonics and measuring harmonics are critical steps in selecting the best harmonic solution to reduce the total harmonic distortion or THD on a power system to comply with the IEEE-519 standard. Power factor correction and harmonic resonance should also be considered. Dan Carnovale P.E. has decades of experience in power quality and harmonics and is a recognized electrical industry expert in power quality and power systems. He is the creator and manager of Eaton's Power Systems Experience Center in Pittsburgh PA where live demonstrations of hands-on power quality and harmonic situations and solutions can be seen first-hand in the Power Quality Lab. Other FAQ topics: What are electrical harmonics; What is harmonic distortion; current harmonics; voltage distortion; What causes current distortion; total harmonic distortion; Harmonic calculation; Calculating harmonics; Frequency harmonics calculator; Harmonics electrical; Harmonics in power electronics; Harmonics in transformers; Transformer harmonics; Variable frequency drive harmonics; What is a VFD line reactor; What is the purpose of a line reactor; What is difference between reactor and inductor; line reactor vs harmonic filter; how to select line reactor for vfd; line reactors; line reactors for vfd; line reactors for ac drives; line reactors for drives; ac line reactor; ac drive line reactor; ac line reactor for vfd; ac line reactor harmonic filter; ac drive line reactor; dc choke; choke; Transformer solutions for harmonics; k rated transformer; harmonic mitigating transformer; hmt transformer; phase shift transformer; Phase Shifting Transformers; Harmonic filter; harmonic filter for vfd; Harmonic Filters for Reducing VFD Distortion; vfd line filter; Passive harmonic filter; Tuned filter; double tuned filter; single tuned filter; tuned filter circuit; single tuned passive filter; detuned filter; detuned harmonic filter; Drive harmonic filters; drive dedicated harmonic filter; active harmonic filter; broadband harmonic filter; harmonic correction unit HCU; harmonic distortion correction; HCU2 harmonic correction unit; 6 pulse drive; 6 pulse rectifier; Six-Pulse Conversion and Harmonics; 6 Pulse VFD For Reducing Harmonics; 18-pulse rectifier; 6 pulse converter; 6-pulse rectifier harmonics; 12 pulse converter; 6-pulse drive harmonics; 12-pulse rectifier harmonics; 18 pulse vfd harmonics; 18-pulse converter; 24-pulse rectifier; 12-pulse rectifier transformer; 24 pulse rectifier harmonics; Harmonics standards; Standard for Harmonic Control in Electric Power Systems; harmonic standard ieee 519; standard harmonic distortion; ieee 519 harmonics; ieee 519 current harmonic limits; ieee 519 standard for harmonic distortion; ieee 519 vfd compliance; Regulation of Harmonics; IEEE Std 519- Harmonic Limits; Power factor; Power factor (PF); Total power factor (TPF); Displacement power factor; Harmonic power factor; power factor improvements; power factor correction; harmonics and power factor; harmonic effect on power factor; harmonic distortion and power factor; harmonic displacement power factor; harmonic resonance in power systems; resonance in power system; harmonic analysis; Power Factor Correction and Harmonic Resonance; parallel resonance in power systems; parallel resonance circuit; series resonance circuit; series and parallel resonance; capacitor resonance; capacitor inductor resonance; capacitor parallel resonance For more information visit https://www.eaton.com/harmonics

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Safety, security and emergency communications 13 - Harmonics and generators ' what do you need to know?

Learn how harmonics interact with generators increasing voltage distortion to ensure loads operate correctly on the generator or utility source || Eaton, Power Quality, Dan Carnovale explains, Harmonic FAQ, Power Systems Experience Center, IEEE-519 Eaton's Harmonic Frequently Asked Question's FAQs collection of videos hosted by Dan Carnovale can help individuals from all different levels of education understand what harmonics are and explain many different solutions for mitigating harmonics on an electrical power system. A high level of total harmonic voltage or current distortion on an electrical power system can cause many problems and it is important to understand how harmonics are generated so they can be reduced or mitigated. What causes harmonics and where do harmonics come from in a power system? Harmonics are generated from non-linear loads that typically include power electronics such as variable frequency drives (VFD) and LED lights. Current harmonics cause excess heating of transformers and cables and damage electrical equipment and voltage harmonics cause mis operation. There are many harmonic solutions including harmonic load solutions and system harmonic solutions to reduce harmonic currents. Calculating harmonics and measuring harmonics are critical steps in selecting the best harmonic solution to reduce the total harmonic distortion or THD on a power system to comply with the IEEE-519 standard. Power factor correction and harmonic resonance should also be considered. Dan Carnovale P.E. has decades of experience in power quality and harmonics and is a recognized electrical industry expert in power quality and power systems. He is the creator and manager of Eaton's Power Systems Experience Center in Pittsburgh PA where live demonstrations of hands-on power quality and harmonic situations and solutions can be seen first-hand in the Power Quality Lab. Other FAQ topics: What are electrical harmonics; What is harmonic distortion; current harmonics; voltage distortion; What causes current distortion; total harmonic distortion; Harmonic calculation; Calculating harmonics; Frequency harmonics calculator; Harmonics electrical; Harmonics in power electronics; Harmonics in transformers; Transformer harmonics; Variable frequency drive harmonics; What is a VFD line reactor; What is the purpose of a line reactor; What is difference between reactor and inductor; line reactor vs harmonic filter; how to select line reactor for vfd; line reactors; line reactors for vfd; line reactors for ac drives; line reactors for drives; ac line reactor; ac drive line reactor; ac line reactor for vfd; ac line reactor harmonic filter; ac drive line reactor; dc choke; choke; Transformer solutions for harmonics; k rated transformer; harmonic mitigating transformer; hmt transformer; phase shift transformer; Phase Shifting Transformers; Harmonic filter; harmonic filter for vfd; Harmonic Filters for Reducing VFD Distortion; vfd line filter; Passive harmonic filter; Tuned filter; double tuned filter; single tuned filter; tuned filter circuit; single tuned passive filter; detuned filter; detuned harmonic filter; Drive harmonic filters; drive dedicated harmonic filter; active harmonic filter; broadband harmonic filter; harmonic correction unit HCU; harmonic distortion correction; HCU2 harmonic correction unit; 6 pulse drive; 6 pulse rectifier; Six-Pulse Conversion and Harmonics; 6 Pulse VFD For Reducing Harmonics; 18-pulse rectifier; 6 pulse converter; 6-pulse rectifier harmonics; 12 pulse converter; 6-pulse drive harmonics; 12-pulse rectifier harmonics; 18 pulse vfd harmonics; 18-pulse converter; 24-pulse rectifier; 12-pulse rectifier transformer; 24 pulse rectifier harmonics; Harmonics standards; Standard for Harmonic Control in Electric Power Systems; harmonic standard ieee 519; standard harmonic distortion; ieee 519 harmonics; ieee 519 current harmonic limits; ieee 519 standard for harmonic distortion; ieee 519 vfd compliance; Regulation of Harmonics; IEEE Std 519- Harmonic Limits; Power factor; Power factor (PF); Total power factor (TPF); Displacement power factor; Harmonic power factor; power factor improvements; power factor correction; harmonics and power factor; harmonic effect on power factor; harmonic distortion and power factor; harmonic displacement power factor; harmonic resonance in power systems; resonance in power system; harmonic analysis; Power Factor Correction and Harmonic Resonance; parallel resonance in power systems; parallel resonance circuit; series resonance circuit; series and parallel resonance; capacitor resonance; capacitor inductor resonance; capacitor parallel resonance For more information visit https://www.eaton.com/harmonics

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