Nagaraju Pogaku

NEOM is a free-economic zone being planned in the northwest of the Kingdom of Saudi Arabia as part of vision 2030 to host 9 million people by 2045. It is anticipated to be world’s first 100% renewable powered grid at scale, predominantly utility-scale onshore wind and solar farms, with total installed generation capacity of 100 GW. The design of a...

This paper presents an energy management system (EMS) for a stand-alone droop-controlled microgrid, which adjusts generators output power to minimize fuel consumption and also ensures stable operation. It has previously been shown that frequency-droop gains have a significant effect on stability in such microgrids. Relationship between these parame...

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This paper presents an energy management system (EMS) for a stand-alone droop-controlled microgrid, which adjusts generator outputs to minimize fuel consumption and also ensures stable operation. It has previously been shown that droop gains have a significant effect on stability in such microgrids. Approximate relationships between these parameter...

The analysis of the small-signal stability of conventional power systems is well established, but for inverter based microgrids there is a need to establish how circuit and control features give rise to particular oscillatory modes and which of these have poor damping. This paper develops the modeling and analysis of autonomous operation of inverte...

The paper investigates the use of ancillary services from inverter-interfaced distributed generators (DGs) to achieve harmonic mitigation across a network. The approach is to include the functionality of a resistive active-power filter (R-APF) within several DGs. The R-APF provides adjustable damping at harmonic frequencies. In a realistic network,...

In this paper, a systematic way of developing a small-signal state-space model of the inverter-based microgrids is presented. Each sub-module is modeled in state-space form and all are combined together on a common reference frame. The complete model is linearized around an operating point and the resulting system matrix is used to derive the eigen...

The presence of inverter-interfaced distributed generators in a network provides an opportunity to mitigate the harmonic voltages caused throughout the network by non-linear loads. DG can be given a resistive characteristic at harmonic frequencies to provide a low impedance path to harmonic current and to damp resonant interaction of line inductanc...