Simplified Hybrid AC–DC Microgrid With a Novel Interlinking Converter

Jayasankar

2023

IJPEDS

In AC/DC hybrid micro grid system (HMGS) power converters are always tested for is performance in distribution, its ability to provide accurate power sharing, transient stability and load dynamics. The existing control methods either complex or limited to achieve optimal power flow. This paper proposes a modified decentralized droop control scheme for interlinking converter (ILC) connected to interconnected AC and DC grids. A three coordinated model is proposed where AC frequency, ILC power and DC voltage are corresponding axis. The power sharing through the ILC is dependent on the AC frequency droop and DC voltage droop which occurs due to overloading. The control scheme is designed for single and three phases ILC. The obtained results are compared with double loop control method which shows less frequency deviations, accurate power sharing. The ILC performs autonomously and transfer power bidirectional under islanded mode. The simulation is carried in MATLAB/Simulink.

Section: Detailed Architecture Of Interconnected Hmgsmentioning

confidence: 99%

Inter-connected AC/DC HMGS power management with 3-phase and 1-phase ILC

Jayasankar

2023

IJPEDS

“…25 designed for hybrid AC-DC MG for optimal power transfer with six switch AC/DC converter combined with DC/DC unidirectional full bridge converter [12]. Load sharing in MG with parallel connected inverters is discussed with the communication link based control [13].…”

Section: Introductionmentioning

confidence: 99%

Energy management system for AC/DC HMGS integrated with interconnected renewable sources and interlinking converter

Jayasankar²

2023

IJAPE

AC/DC hybrid micro grid system (HMGS) is designed with renewable energy sources (RES) and battery energy storage system (BESS) with unique control schemes, interfaced with multi terminal interlinking converters (ILCs). This ILC operates on droop control scheme to guarantee bidirectional power sharing to AC/DC sub grids. The power sources in AC/DC sub grids like PV, Fuel cell, BESS are controlled by advance control methods for maximum power extraction with power quality. A three-level control structure is designed for optimal energy management system (EMS). The first level confirms the power balance in AC/DC sub grid with autonomous bidirectional power transfer via ILC in islanded mode. The second level tracks the batteries state of charge (SoC), based on the minimum and maximum SoC the battery operates for charging and discharging. The third level gives the power redundant capability for critical loads connected in AC/DC sub grid for DC system and single-phase system.

“…Different schemes are described to achieve the bidirectional power transfer which mainly relies on the stability with GPS accuracy [17]. The HMGS with multi-port ILC has a special control scheme with unidirectional DC-DC sub-converter (UDDSC) which maintain DC voltages connected at DC grid system and supplying constant DC voltage and minimizing the complexity [18]. However need-based distributed coordination strategy for islanded HMGS using electric vehicle (EV) which opts decentralized mode of operation for requirement of power load is fulfilled [19].…”

Section: Introductionmentioning

confidence: 99%

Autonomous power sharing for AC/DC HMGS using decentralized modified droop method for interlinking converter

Jayasankar

2022

IJPEDS

<p>The present trend of integrating renewable energy sources (RES) in AC/DC hybrid micro grid systems (HMGS) has certainly reduced the greenhouse gases and provides the variety of power sources for micro grid (MG). Interlinking converter (ILC) is the main converter for interconnecting AC/DC sub-grids with a variety of features like autonomous bidirectional power sharing, reducing the power conversions in the grid and additionally a featuring aspect for energy management system (EMS). Interlinking converters are desired to maintain stable frequency, constant voltages at buses, reduce the power losses, reduce switching losses and control on circulating currents, most of the control methods could not achieve all. In this paper, the decentralized modified droop control method is presented which is significant in meeting the autonomous bidirectional AC/DC power load demand and in achieving the desired features. A three coordinated model is proposed where AC frequency, ILC power and DC voltage are the corresponding axis. The power sharing through the ILC is dependent on the AC frequency droop and DC voltage droop which occurs due to overloading. This control scheme is compatible for interconnection with multi-port grids. This control schemes provide more reliable, stable and accurate results compare to conventional droop methods.</p>