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Summary Growing electricity demand, environmental issues, and challenge to decrease dependence on fossil fuel resources have increased the inception of wind generation into the power system. However, higher penetration of wind‐based generating units into the existing grid can affect the working of the power system. Traditionally, a wind unit does not provide inertia, but collectively, wind units can have a notable impact on the dynamic performance of the power system. However, the battery energy storage systems have the potential to offer flexibility and ancillary supports to the power system. This article evaluates the impact of redox flow battery (RFB) in coordination with a doubly fed induction generator (DFIG)–based wind turbine unit (WTU) to enrich the dynamic performances of a multi‐source interconnected power system in a deregulated electricity market. The modified inertial control scheme is proposed for the DFIG unit that responds in the event of frequency deviation in the grid. The turbine sheds its kinetic energy and provides active power injection, thereby enhancing the frequency response of the system. The recently developed moth‐flame optimization (MFO) algorithm is employed for optimal tuning of the proportional‐integral (PI) controller and the speed regulator of a DFIG‐WTU. The simulation studies have been executed to analyze the impact of the RFB with WTU on the system frequency, tie‐line and different generating units power through a comparative study in terms of the settling time, and peak overshoot/undershoot in a deregulated electricity market. The analysis reveals that the WTU effectively contributes to sustaining the frequency and tie‐line power oscillations during abrupt load disturbances in the proposed power system. Moreover, the inclusion of RFB in coordination with the WTU helps to reduce the stress on a wind turbine during inertial control scheme. It can also reduce wind curtailments by absorbing excess power flowing through transmission lines, reduces wastage of green energy, and gives better dynamic response under different operating conditions of the deregulated electricity market.

Summary This article discusses evaluation of dynamic contribution of wind turbine unit of doubly fed induction generators (DFIGs) type and capacitive energy storage (CES) in frequency regulation services in 2‐area interconnected power system, having diverse thermal‐hydro‐gas (T‐H‐G) generating units in deregulated power environment. To obtain optimal dynamic responses of area's frequency oscillations following a small load perturbation, CES/DFIG units have been included in both control areas in coordination with thyristor controlled phase shifter (TCPS).The behavior of DFIGs to enhance dynamic performances of the proposed power system has been investigated by providing inertial support through modified inertial control scheme. The control scheme responds proportionally to frequency variations due to sudden load changes in the power system and uses wind turbine's kinetic energy to provide the inertial control support under several operational conditions. The gain parameters of the integral controller is obtained by using integral square error technique. The performance of the proposed system has been examined in different contract scenarios. Results show that the coordinated action of CES/DFIG units with TCPS unit provide optimal transient performance by arresting the initial dip in area frequencies as well as the power flow deviation in tie‐line between the 2 areas. Further, analysis reveals that CES unit response is better and quicker than DFIG unit to damp the system oscillations.

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