Linear Approximation of Transient Process in R-C Circuit Fed by Power Source

The use of low-pass filters for smoothing energy flows in different applications is remarkable. However, in the case of a power (instead of a voltage) source, this circuit becomes non-linear and its transient process is difficult to assess. Such cases are typical for renewable (PV and wind turbine) plants being equipped with DC-AC power converters.Submitted in the presented article is an approximation procedure, which gives a linearization and an efficiently approachable technique to compare real current (voltage) curves with estimated results. As a result, the development of low-pass filter fed by power source becomes relatively simple task.