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<head><title> Lit. Review </title>
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Reinforcement Learning-based Frequency Control for Renewable Energy Microgrids
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<table border=2>
<caption><b>Literature Review<b></caption>
<tr>
<th>Paper name </th>
<th> About</th>

<th>Results/Advantages</th>
<th>Limitations</th>
</tr>

<tr>
<td><b>A Review of Droop Control Techniques for Microgrid</b></td>
<td>This paper reviews various droop control techniques used for managing distributed generation (DG) units within a microgrid.
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Droop control is a widely accepted method for load sharing among inverters without requiring communication links.
<br></td>

<td>Stable Power Sharing – Droop control helps distribute power between different Distributed Generation (DG) sources (like solar, wind, or batteries) without needing communication between them.
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Reduced Need for Centralized Control – Since droop control works without requiring communication between generators, it makes the system simpler and more cost-effective to operate.
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</td>
<td>Slow Response Time – Since droop control adjusts power output gradually, it may not respond quickly to sudden load changes, causing temporary instability.
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Communication-Free but Less Optimized – While droop control works without requiring communication between generators, it also means there is no coordination, which can lead to inefficient power distribution.</td>
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<tr>
<td><b>Frequency-based control of islanded microgrid with renewable
energy sources and energy storage</b></td>
<td>This paper presents a frequency-based control strategy for an islanded microgrid primarily powered by renewable energy sources (RESs) and an energy storage system (ESS).
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In islanded mode, frequency deviations can degrade power quality, so the study proposes a droop control method where the state of charge (SoC) of the battery determines the microgrid frequency.
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This approach allows all distributed energy resources (DERs) to adjust their power output without direct communication, maintaining power balance. </td>

<td>The proposed control method keeps the microgrid frequency within the strict limits ,ensuring high power quality.
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In case of a solid short-circuit, the battery converter injects a large fault current, triggering protection devices to isolate the fault and restore normal operation.
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<td>The proposed strategy relies on the battery's ability to handle all power mismatches, which may not be feasible in larger microgrids with high demand fluctuations.
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Although the battery aids in short-circuit fault clearance, the study does not extensively explore protection coordination or fault ride-through strategies for severe disturbances.</td>
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