I see a lot of post in regards to power quality and solutions presented. I have compiled a list of all the PQ problems and the solutions you might find useful.
Legend
A: Reasonable to expect that the indicated condition will be corrected by the indicated technology.
B: There is significant variation in power condition product performance. It may or may not work.
TVSS: Transient Voltage Surge Suppressors
EMI/RFI: Filters
IT: Isolation Transformer
VRE: Voltage Regulator (Electronic)
VRF: Voltage Regulator (Ferroresonant)
MG: Motor Generator UPS
SPS: Standby Power System
UPS: Uninterruptible Power System
SEG: Standby Engine Generator
PQ Condition/Solution
Transient Voltage Surge Common Mode: A: IT, VRF, MG, UPS. B: TVSS, VRE, SPS,
Transient Voltage Surge Differential Mode: A: IT, VRF, MG. B: TVSS, VRE, SPS
Noise Common Mode: A: IT, VRF, MG, UPS. B: EMI/RFI, VRE, SPS, UPS
Noise Differential Mode: A: VRF, MG, UPS B: EMI/RFI, IT, VRE, SPS
Notches: A: VRF, MG, UPS B: IT,
Voltage Distortion: A: MG B: VRF, UPS
Sag: A: UPS B: VRE, VRF, MG, SPS
Swell (Over Voltage): A: VRF, MG, UPS B: VRE, SPS
Under Voltage: A: VRE, VRF, MG, B: UPS, SPS
Over Voltage: A: VRE, VRF, MG B: SPS, UPS
Momentary Interruption: A: SPS, UPS B: MG
Long Term Interruption: A: SEG B: N/A
Frequency Variation: A: UPS B: MG, SPS, SEG
Hope this is helpfull
Legend
A: Reasonable to expect that the indicated condition will be corrected by the indicated technology.
B: There is significant variation in power condition product performance. It may or may not work.
TVSS: Transient Voltage Surge Suppressors
EMI/RFI: Filters
IT: Isolation Transformer
VRE: Voltage Regulator (Electronic)
VRF: Voltage Regulator (Ferroresonant)
MG: Motor Generator UPS
SPS: Standby Power System
UPS: Uninterruptible Power System
SEG: Standby Engine Generator
PQ Condition/Solution
Transient Voltage Surge Common Mode: A: IT, VRF, MG, UPS. B: TVSS, VRE, SPS,
Transient Voltage Surge Differential Mode: A: IT, VRF, MG. B: TVSS, VRE, SPS
Noise Common Mode: A: IT, VRF, MG, UPS. B: EMI/RFI, VRE, SPS, UPS
Noise Differential Mode: A: VRF, MG, UPS B: EMI/RFI, IT, VRE, SPS
Notches: A: VRF, MG, UPS B: IT,
Voltage Distortion: A: MG B: VRF, UPS
Sag: A: UPS B: VRE, VRF, MG, SPS
Swell (Over Voltage): A: VRF, MG, UPS B: VRE, SPS
Under Voltage: A: VRE, VRF, MG, B: UPS, SPS
Over Voltage: A: VRE, VRF, MG B: SPS, UPS
Momentary Interruption: A: SPS, UPS B: MG
Long Term Interruption: A: SEG B: N/A
Frequency Variation: A: UPS B: MG, SPS, SEG
Hope this is helpfull