An enhanced islanding microgrid reactive power, imbalance power, and harmonic power sharing scheme
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The document outlines an enhanced power sharing scheme for islanding microgrids, focusing on droop control methods for effective real and reactive power distribution among distributed generators (DGs). It describes the importance of adaptive virtual impedance control and the impact of load characteristics on power sharing performance. Additionally, it includes details about the system architecture, applications, and tools used for implementation.
An enhanced islanding microgrid reactive power, imbalance power, and harmonic power sharing scheme
- 1. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com An Enhanced Islanding Microgrid Reactive Power, Imbalance Power, and Harmonic Power Sharing Scheme Abstract Introduction: In the case of islanding operation, the load demand must be properly shared by parallel DG units. To facilitate the power sharing requirement without using any communications between DG units, the real power–frequency and reactive power– voltage magnitude droop control method has been developed. In this control category, real power and reactive power in the power control loop are calculated using low-pass filters (LPF). Accordingly, the major focus of droop control is the sharing of averaged real and reactive power. It has been pointed out that the real power sharing is always accurate, while the reactive power sharing performance is dependent on the impedance of DG feeders. In addition, the droop control method may cause some stability problems when DG feeders are mainly resistive. To enhance the power sharing performance in a microgrid, various types of modified droop control methods have been developed. Existing system:
- 2. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Each DG system is comprised of a dc source, a pulse-width modulation (PWM) voltage source inverter (VSI) and LC filters. Under normal mode of operation, the microgrid is connected to the utility system at the point of common coupling (PCC) usually through a static transfer switch (STS). In this mode, the two DG systems are controlled to provide local power and voltage support for critical loads 1–3. This configuration reduces the burden of generation and delivery of power directly from the utility grid and enhances the immunity of critical loads to system disturbances in the utility grid. When a utility fault occurs, the STS opens to isolate the micro and utility grids within half a line frequency cycle. The two DG systems are now the sole power sources left to regulate the load voltages and to supply uninterrupted power in a certain predetermined DG power sharing scheme to all critical loads within the microgrid. Subsequently when the fault is cleared, the microgrid has to be resynchronized with the utility grid before the STS can be reclosed to return the system smoothly back to the grid- connected mode of operation. Proposed system: In this paper, an adaptive virtual impedance control method is applied to DG units in islanding microgrids. The virtual impedance at fundamental positive sequence, fundamental
- 3. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com negative sequence, and harmonic frequencies are determined according to transient real power variations. To activate small amount of transient power variations, a transient control term is added to the conventional real power–frequency droop control. Through interactions between real power variations and the virtual impedance regulation, a microgrid reactive power, imbalance power, and harmonic power sharing errors can be compensated at the steady state. Applications: Distributed generation. Renewable energy resource (RES).
- 4. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Block diagram: THREE PHASE INVERTER DRIVER CIRCUIT PIC CONTROLLER WITH BUFFER 5V DC 12V DC LC FILTER LOAD INPUT DC SUPPLY NON LINEAR LOAD
- 5. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Tools and software used: MPLAB – microcontroller programming. ORCAD – circuit layout. MATLAB/Simulink – Simulation.