Anurag Kumar Swami’s scientific contributions

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Publications (4)

Fig -3: L, LC and LCL filter bode plot. In summary, the design of the LCL filter concerns the following points; • Overall filter size, cost, losses • Current distortion in different components • Resonance and dynamic performance of the overall system • Low voltage drops across the filter • Higher power factor. The parameter selection, according to the recommended maximum current distortion limit in the output current set the percentage of current ripples in the inverter output current is the primary concern to describe the lower limit of the filter inductance value. Similarly, the filter capacitance is chosen based on the energy stored in the capacitor. The selection for the filter capacitor is a trade-off between the energy stored in the capacitor and the inverter-side inductance (Lf )[39]. The higher value capacitance uses more reactive power to flow into the capacitor and more load current demand from the Lf and the inverter switches. As a consequence, the system efficiency will be decreased. The
Fig -6: Block diagram of controller tuning using PSO algorithm.
Fig -9: PI controller gain response comparison with ZN, PSO and GA The selected controller parameters are detailed in both Table 5 and Table 6. To initiate the optimization processes, the initial parameters for the PSO and GA are derived from the ZN method, which assists in establishing the upper and lower limits. In Fig. 9, a comparative analysis of the PI controller's settling time (Tss) and maximum peak overshoot (Mp) is conducted across different tuning methods, including ZN, PSO, and GA, and the results are summarized in Table 6. Notably, GA outperforms the other methods by achieving Mp value and Tss that aligns with the desired criteria. Consequently, the GA tuning method is selected for further experimental validation, as it meets all the specified criteria. The exploration into the controller's performance under weak grid conditions is prompted by the intermittent nature of renewable sources and variations in load-side impedance. In this context, the figures, specifically Fig. 10, 11, and 12, illustrate the dynamic response of the PI controller under various conditions during power regulation. These figures underscore the controller's efficacy in the nonlinear time domain, particularly when there are changes in current from 15A to 20A, demonstrating its dynamic response and its capability to control reactive power effectively. The experiment aims to verify the obtained controller parameters from real-coded based GA, see Table 6, with the PI and PR controllers' performance for weak grid operating conditions based on Lg variation and (X/R) variation, fault occurrence at the PCC and also tested for sudden load change in the standalone distributed network.
Fig -12: (a). Id current, (b). Iq current, (c). VSI output 3ϕ -current during the fault condition, (d). Output 3ϕ -voltage during the fault condition. Fig -13: THD analysis of VSI output current(a).for PI controller, (b). for PR controller.
Optimal designing and parameter selection of voltage source inverter for real-time performance analysis in weak grid and standalone mode
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September 2024

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11 Reads

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Anurag K Swami
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Seamless_transition_of_inverters_from_islanding_to_grid-connected_mode_connected_to_weak_grid.pdf

March 2024

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9 Reads

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Shreyasi Som

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Ankush Sharma

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Anurag Kumar Swami

—The fundamental principle of integrating a voltage source within an electrical network to enhance voltage control and promote network stability remains a core tenet of electrical engineering. In scenarios characterized by weak grid conditions, where voltage fluctuations and instability are prevalent, a strategic solution involves the synergistic deployment of both Grid-Forming (GFM) and Grid-Following (GFL) inverters. This integrated approach is designed to address the inherent drawbacks associated with fragile grid infrastructures, ultimately improving the reliability and performance of the electrical network. This paper presents a comparative analysis when GFM inverters are integrated with GFL inverters in a microgrid (MG). The MG network is connected to the weak grid through a seamless transition from islanded to grid-connected mode. Through MATLAB/SIMULINK simulations, it highlights voltage and frequency stability challenges during transient conditions, providing valuable insights into weak grid connections.

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