Abstract
In recent years, injection of renewable energy such as solar power into the power grid is increasing. However, inclusion of large-scale intermittent-type renewable energy requires better management in proper understanding of grid’s variable characteristics and its protection systems. In this paper, the investigation on overvoltage issue is illustrated. Overvoltage in distribution feeder occurs when large amount of solar power is injected at low power demand. Another investigation is on false operation of overcurrent relays due to reverse power to the 33 kV loads. The potential solutions to the two issues are illustrated in the small-sized power grid system using bi-directional inverters on AC buses in charging battery banks and adjusting the relay current settings. The benefits of solar power injection are illustrated whereby output power from generators is decreased and transmission losses are reduced. Electrical Transient Analysis Program (ETAP) was used for investigations.
Highlights
In recent years, many countries have largely deployed renewable technologies and mostly, allow distributed power generation at the low-voltage distribution network [1]
The potential solutions to the two issues are illustrated in the small-sized power grid system using bi-directional inverters on AC buses in charging battery banks and adjusting the relay current settings
There are two cases which are used in illustrating the decrease in output power of generator when there is solar power injection
Summary
Many countries have largely deployed renewable technologies and mostly, allow distributed power generation at the low-voltage distribution network [1]. Based on [4], the current conventional grid system is not ready for large-scale distributed generation. Large-scale injection of solar power will benefit the grid system. Overvoltage in distribution feeder is possible due to large amount of solar power injection at low power demand. Reference [10] concluded that overvoltage occurs during weekend when the loads are low but large amount of solar power injection on the distribution feeder. Reference [11] suggests implementing large storage devices on the distribution feeder to avoid overvoltage issue. False operation of the grid’s protection system causes the reliability of the grid to be a main concern
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
