Study of Frequency Response in Two Area Interconnected Power System by Using Storage Based Frequency Shaping Control
Authors: Om Prakash Adhikari, Jeetendra Chaudhary
Abstract—Whenever there is imbalance in active power generation and demand in a power system, frequency of the system will deviates form its steady state value.Time behaviour of frequency of the power system for a any active power imbalance in a system is known as frequency response. Frequency response analysis is very important to identify whether the frequency remains with in the predefined range or not after imbalance .If frequency go beyond its limit then performance of the system components like turbines, transformer, AC motors will be poor and there might be rate of change of frequency and under frequency tripping leading to a shut down of certain or overall power supply. Frequency response is analysed by the value of Nadir, Rate of Change of Frequency (RoCoF) and steady state frequency deviation in a frequency response curve. Nadir and RoCoF are determined by the inertial response (IR) and steady state frequency deviation by power frequency response (PFR) of the system.IR is related with inertia of the system and PFR is related with governor droop and load frequency sensitivity of the system. In case of low inertia system specially system with high PV,wind penetration inertia of the system will be very low and both nadir and RoCoF will be high may causing instability of the system.One way of improving IR is by using Energy Storage System (ESS) which have excellent ramp rate. The use of storage system with Frequency Shaping Controller (FSC) in single area will convert overall system dynamics into first order such that nadir is naturally eliminated and RoCoF and steady state frequency deviation can also be obtained as desired.In two area system connected via tie line whenever there is increase in demand in one area then both frequency and tie line power flow will change.With implementation of frequency shaping control aids the IR and PFR of the area where it is implemented such that both change in frequency and tie line power flow can be reduced with much improved frequency response having low RoCoF in two area.
Keywords—Rate of Change of Frequency (RoCoF) , Inertial Response (IR),Power Frequency Response(PFR),Energy Storage System(ESS),Frequency Shaping Control (FSC),Tie Line Power Flow, Nadir,Steady State Frequency Deviation.
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Published In: International Conference on Role of Energy for Sustainable Social Development (RESSD-2022)
Date of Conference: 8th-9th August 2022
Conference Location: Bhaktapur, Nepal
Publisher: IEEE Power and Energy Society Nepal Chapter
Cite the paper as:
O. P Adhikari, J. Chaudhary, “Study of Frequency Response in Two Area Interconnected Power System by Using Storage Based Frequency Shaping Control”, International Conference on Role of Energy for Sustainable Social Development, 8th-9th August 2022, Bhaktapur, Nepal