Power Sharing in Island Microgrids

Abstract

The growth of local renewable energy sources and heavy loads in power distribution networks, such as the increasing electric vehicles charging stations, causes several issues with a direct impact on the stability of the electrical grid. An attempt to overcome such issues is the microgrid concept, which has the grid structured into local sub-grids that manage their power and energy balancing. A microgrid may operate connected or disconnected from the main grid, being dynamically necessary to guarantee a power balancing between local loads and sources. Furthermore, as several power units are connected to the same microgrid, equity is also required in terms of power sharing. Current work explores a scenario of an island operation of a microgrid with multiple sources, including battery storage systems and sharing power with multiple loads, including electric vehicle chargers, a scenario appropriated to a city grid. A local control solution for a stable operation of the microgrid in terms of both power balancing and power sharing is presented and validated through numerical and experimental results.

Comparison of DSOGI-Based PLL for Phase Estimation in Three-Phase Weak Grids

“…As an example, in this paper, the choice of a PLL to be applied on a power converter control loop is considered, operating in a low-voltage microgrid as described in [27]. In such conditions, the grid can be either weak (island) or strong (grid connected).…”

Second Order Sliding Mode Control for Islanded Ac Microgrids With Renewable Power Resources

“…Different strategies fall into two main categories: to control the DGs and to share the power between DGs in an isolated MG, which are communication-free and communication-based strategies [6,7]. Droop control is a communication-free strategy that only needs local information [8]; however, it doesn't have a fast response, and it may cause some stability problems. A medium voltage MG is studied in [9,10], and employing a droop control strategy, the control and power sharing between DGs are achieved under balanced and unbalanced conditions.…”

Delay-Dependent Stability Analysis of Load Frequency Control for Power System With EV Aggregator

“…The frequency deviation caused by an intermittent energy grid connection is difficult to be eliminated by traditional generator sets. With the grid connection of controllable loads such as electric vehicles (EVs) and the rapid response characteristics of batteries, some studies paid attention to vehicle-to-grid technology, which provides frequency regulation services with a large number of converging EVs (Peng et al, 2017;Jia et al, 2018;Pinto et al, 2021;Teng et al, 2021).…”