Linear and Nonlinear System Modeling

1Assessment of Faults in Hybrid System Connected with Main Grid

Aveek Chattopadhyaya¹*, Niladri Mukherjee² and Surajit Chattopadhyay³

¹Department of Electrical Engineering, GNIT, Panihati, Kolkata, India

²Department of Electrical Engineering, S.K.F.G.I., Mankundu, Hooghly, India

³Department of Electrical Engineering, GaniKhan. C. Institute of Engineering and Technology, Malda, India

Abstract

In this chapter, fault assessment in grid-connected microgrid (solar and wind-based hybrid system) was performed by signal processing-based waveform analysis. For this analysis, wind and solar system-based grid-connected microgrid (hybrid system) is considered. System current waveforms were captured for fault identification. Total harmonic distortion (THD) based on fast Fourier transform (FFT) and inter-harmonic group analysis were considered as tools to identify the presence of different harmonics in non-identical environments. In Park plane, one space vector was also calculated from the captured three-phase current signals. Different parameters based on discrete wavelet transform (DWT) were also computed from space vector for assessing the symmetrical and unsymmetrical faults in hybrid system, which is connected to the main grid.

Keywords: THD, FFT, DWT, skewness, kurtosis, mean RMS

1.1 Introduction

The demand for renewable energy resources has escalated significantly over the past few years, due to the fact that the fossil fuels will run out in the near future and the harmful environmental ...