Review of Electric Spring: A New Smart Grid Device for Efficient Demand Dispatch and Active and Reactive Power Control Mehul Dansinh Solanki  

Outline Introduction Operating Principle Generalized averaged model Control Methodologies Mitigation of Harmonics Comparison of ES with FACTS Conclusion

Introduction Major concerns of power system administrator: Pollution free generation of electricity. Increase penetration of generation through renewable sources (intermittent and unpredictable) viz. wind and solar causing stability issues. Quality power for all. Generation management. Demand Side Management / Demand dispatch.

Basic Structure of Electric Spring

Modeling of ES

Control Methodologies Active and Reactive Power Control and Voltage Regulation Mitigation of Harmonics. Power Factor Enhancement Voltage Balancing and Neutral Current Mitigation Frequency Control in Micro-grid Considering Variations in Wind Speed Considering Variations in Load Reducing Generated Power through Loss of Generator. Relocating ES at a Bus other then Generator Bus.

Mitigation of Harmonics

Comparison of FACTS and ES Electric Spring FACTS Controllers Can handle active as well as reactive power . Can handle reactive power only Acting as integral part of load to form smart load, dispersed through out the distribution system and hence cheaper. Single point compensation having high rating hence cost It is a current controlled voltage source with input side control It is a voltage controlled voltage source with output control

Conclusion Ist generation ES can handle reactive power only. IInd and IIIrd generation ES can handle active as well as reactive power. Through ES, Non critical load is allowed to modulate with the generation pattern of intermittent renewable source and together this combination is maintaining the voltage across the critical load and that’s how it is forming the smart load. Adaptive smart load leads to adaptive building in terms of energy usage. Detailed analysis of ES, on the strong foundation of mathematical modeling along with its utilization towards voltage regulation, active and reactive power management, power factor correction, power quality enhancement through mitigation of harmonics and frequency control, has been evaluated. Dispersed ES’s can provide a strong and cost effective mechanism for distributed voltage control that emerged as a novel way of DSM on the real time bases, without being dependent on ICT.

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