# The Power System and Microgrid Protection--A Review
## 3 Protection Scheme of Microgrid
### Adaptive Protection
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Refs.** & **Published Year** & **DG Presence** & **Protection Scheme** & **Real/Simulation** & **Protective Relay** \\ \hline
[113] & 2018 & DG & Adaptive & Simulation & DOC \\
[30] & 2019 & SM Based & Modification & Real & OC \\
[47] & 2019 & SM Based & Modification & Real & DOC \\
[119] & 2019 & SM and Inverter & & & Current and \\  & & Based & Adaptive & Real & Voltage \\
[51] & 2019 & Inverter Based & Modification & Simulation & Current Based \\
[98] & 2019 & Inverter Based & Modification & Simulation & OC \\
[49] & 2020 & Inverter Based & Adaptive & Simulation & DOC \\
[50] & 2020 & DG & Modification & Simulation & DOC \\
[68] & 2020 & SM and Inverter & & & \\
[69] & 2020 & DG & Modification & Simulation & OC \\
[82] & 2020 & SM and Inverter & & & \\  & & Based & & \\
[83] & 2020 & Inverter Based & Impedance Based & Simulation & IDM \\
[93] & 2020 & Inverter Based & Modification & Real & Current Based \\
[94] & 2020 & Inverter Based & Adaptive & Real & IDM \\
[99] & 2020 & DG & Adaptive & Simulation & Current Based \\
[116] & 2020 & SM and Inverter & & & Current and \\  & & Based & & & Differential \\
[122] & 2020 & DG & Adaptive & Simulation & DOC \\
[123] & 2020 & DG & Adaptive & Simulation & DOC \\ \hline \hline \multicolumn{5}{c}{Three-phase (L.L.L), two-phase (L.L.), two-phase to-ground (L.L.G), single line-to-ground (L.G). Solar energy (SE), wind turbine (WT), synchronous machine (SM), intelligent device manager (IDM).} \\ \end{tabular}
\end{table} 
Table 1: _Cont._ \begin{table}
\begin{tabular}{c c c} \hline \hline
**Refs.** & **Published Year** & **Main Contribution** \\ \hline [PERSON] et al. [114] & 2002 & AP scheme by applying an LPT \\ [PERSON] et al. [75] & 2003 & Single-end fault location based on the TW \\ [PERSON] et al. [80] & 2003 & Fault location using the dyadic WT with Haar wavelet \\ [PERSON] and [PERSON] [29] & 2004 & AP based on communication and network device data \\ [PERSON] et al. [26] & 2005 & DWT and NNR classification, HIF detection \\ [PERSON] et al. [108] & 2006 & Proposing a method based on the abc-dq transformation \\ [PERSON] and [PERSON] [62] & 2008 & Coordination of the DOC relay by FCL based on DCs capacity \\ [PERSON] and [PERSON] [104] & 2008 & The FD by using the DFT and THD \\ [PERSON] et al. [44] & 2010 & Using the DS by high-rate sampling of the current \\ [PERSON] et al. [64] & 2010 & Multi-level protection based on communication with PLC \\ [PERSON] et al. [66] & 2010 & Multi-agent protection system based on communication \\ [PERSON] and [PERSON] [92] & 2011 & Fault location estimation based on the impedance-based scheme \\  & & Proposing a programmable MPRs relay with directional \\ [PERSON] et al. [106] & 2011 & elements in grid-connected and islanded modes without \\ [PERSON] et al. [55] & 2012 & MBP coordination strategy through the communication-assisted \\ [PERSON] et al. [103] & 2012 & Using harmonic impedance by injecting a current disturbance \\ [PERSON] et al. [79] & 2012 & Fault location of distance relay using the Haar WT \\ [PERSON] et al. [27] & 2013 & Setting the distance protection based real event data \\ [PERSON] et al. [31] & 2013 & Analyzing the risk of protection systems operation in the presence of DG \\ [PERSON] et al. [42] & 2014 & Using the DS by the symmetrical component of the current \\ [PERSON] and [PERSON] [57] & 2014 & The adaptive scheme for coordination between recloser-fuse \\ [PERSON] et al. [86] & 2014 & TW using MM technology and multi-end protection scheme \\ [PERSON] et al. [101] & 2014 & Proposing a passive islanding detection method based on the 5 th harmonic voltage magnitude \\ [PERSON] et al. [43] & 2015 & The HIL AP scheme \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Classification of important research works in the field of protection systems. Table 3 lists a summary of the microgrid protection schemes [36; 40; 41; 124].