Global energy crisis and environmental pollution increasingly promote the application of Renewable Energy Sources (RES). As a feasible option to overcome the issues of RES integration in power system such as instability and fluctuation, large scaled Battery Energy Storage System (BESS) and its associated Energy Management System (EMS) has become one of the most popular research area for future RES power system. Despite many advantages of integrating BESS in RES based power system, the highly dynamic fluctuations in generation and demand in standalone RES based Microgrid (MG) causes damaging impact on lifespan of battery, which greatly increases the operating cost of the standalone MG. In recent years, the novel concept of Battery-Supercapacitor Hybrid Energy Storage System (HESS), which contains two complementary storage devices, is been developed to mitigate the impact fluctuating power exchange on lifespan of battery. This paper critical reviews the latest works related to this area In terms of topologies, Control and Energy Management System (EMS). A case study of Standalone PV MG with HESS is presented to show its practicality and the benefits of using HESS are elaborated via Cost Function. Among the various topologies and related EMS design, the review analysis and discusses the importance of balancing the trade-off between the technological needs and economic feasibility when designing a Battery-Supercapacitor HESS in Standalone RES based MGs. have been carried out to improve the power quality and reliability of the MGs ranging from novel system topologies [10][11][12] to intelligent power management and control strategies [13][14][15][16]. Unlike the grid-connected MGs that have virtually unlimited and strong support from the high inertia power supply, standalone MGs rely heavily on ESS to balance the unmatched profiles of generation and power consumption [17]. The ESS acts as buffer to absorb surplus energy and supply the stored energy when power deficit. Furthermore, ESSs in standalone MGs also play an important role in regulating instantaneous power variations, power quality and the system reliability [18]. The nowadaysavailable ESS technologies for MG applications are been listed and compared in Table 1:

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