# Investigation into impact of non-dispatchable renewable energy sources on system voltage stability

### Abstract

The concern for ever increasing demand for electricity, progressive depletion of fossil fuels, reduction in carbon footprint, improved infrastructure reliability, etc. have encouraged the power utility companies to adopt renewable energy sources in conventional power systems. The enhanced penetration of non-dispachable renewable energy sources such as solar photovoltaic (PV) and wind energy into existing distribution and transmission networks had led to various issues of concern regarding system voltage stability. This paper presents a detailed study of the important issues such as optimum location and sizing of distributed generation (DG) units from voltage stability viewpoint, assessmentof voltage instability in the renewable integrated system and its enhancement with employment of devices such as fixed capacitors, flexible A. C. transmission system (FACTS) and energy storage system (ESS) into transmission and distribution networks. The review results provide a comprehensive background for the voltage stability investigation in non-dispatchable renewable integrated power systems with major outcomes and findings of future research work in the field of power system stability.

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