For GTI’s it can be the same thing.or not. Ripples are often the filtered response to pulse noise.
The power noise current in grid tied inverters (GTI) is somewhat complex.
The purpose of a GTI is to supply a constant power output in sync with grid such that it produces pure sinusoidal power with pf=1.0 .
However the non-linear positive feedback due to hysteresis if a control system produces current phase noise from harmonics which after filtering looks like ripple.
Attempting to design a GTI as a digitally controlled power source as a very low impedance voltage source has inherent grid noise from other GTI ‘s. The proper method is to use a filtered switching current source that detects line voltage and output current and regulates current to perfectly match frequency, phase, voltage and current with an offset for constant AC power at the fundamental with e.g. < 1% THD . Hysteric voltage control of any of these variables will amplify phase noise ( broad band harmonics with near band jitter on each ).
Therefore the design must factor these specs to avoid harmonics at low output impedance (caps) and have full specs for all 4 scattering parameters as well. (Sorry if this is to complex at the moment) this means output forward + reverse impedance and transfer function)
This can cause distribution protection fault issues.
For example , I have recent reports that have been observed recently in SC, USA on a 1MW utility Solar farm with 30 Huawei GTI’s . That while putting out perfect 40A current for over a year until other 3rd party Solar farms nearby came online. Then it started to blow 90 fuses which were each supplying 40 Amps forward to the grid while other farms were introducing noise in harmonics in the reverse direction Both adding >> 60A by up to 35% due low impedance between both GTI’s at harmonics measured as power phase noise.
Hysteresis can certainly be controlled but system control stability factor also becomes more complex with the network fighting against each other from low impedance s parameters where Zo <<10%