Distributed Control Strategy for Autonomous Operation of Hybrid AC/DC Microgrid

Baek, Jongbok; Choi, Wonchang; Chae, Su Young

doi:10.3390/en10030373

Cited by 27 publications

(24 citation statements)

References 25 publications

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“…P Available Bat ≅ 2.7 kW during that time interval, Δt. The number of batteries of the battery bank is obtained from Equation (2). It is composed of 18 batteries of 12 V connected in series, with a battery bank rated voltage of V Rated Bat = 216 V. The battery bank is charged/discharged from/to the DC bus of the MG by means of a 3 kW bidirectional half-bridge DC/DC converter, as shown in Figure 2b.…”

Section: Loadmentioning

confidence: 99%

“…(1) Control references sent by the MGCC. (2) PGrid is the power injected from the MG to Grid; Po PV is the PV generated power and P Load DC is the power consumed by the DC loads.…”

Section: The Power Management Algorithm Of the Mgmentioning

confidence: 99%

“…ESSs are a fundamental part of MGs, because they allow for a better utilization of the RESs, contributing to the MGs stability and reliability [1,2]. The DC microgrid under study in this work is depicted in Figure 1b.…”

Section: Introductionmentioning

confidence: 99%

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Practical Analysis and Design of a Battery Management System for a Grid-Connected DC Microgrid for the Reduction of the Tariff Cost and Battery Life Maximization

et al. 2018

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This study is focused on two areas: the design of a Battery Energy Storage System (BESS) for a grid-connected DC Microgrid and the power management of that microgrid. The power management is performed by a Microgrid Central Controller (MGCC). A Microgrid operator provides daily information to the MGCC about the photovoltaic generation profile, the load demand profile, and the real-time prices of the electricity in order to plan the power interchange between the BESS and the main grid, establishing the desired state of charge (SOC) of the batteries at any time. The main goals of the power management strategy under study are to minimize the cost of the electricity that is imported from the grid and to maximize battery life by means of an adequate charging procedure, which sets the charging rate as a function of the MG state. Experimental and simulation results in many realistic scenarios demonstrate that the proposed methodology achieves a proper power management of the DC microgrid.

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Section: Loadmentioning

confidence: 99%

“…(1) Control references sent by the MGCC. (2) PGrid is the power injected from the MG to Grid; Po PV is the PV generated power and P Load DC is the power consumed by the DC loads.…”

Section: The Power Management Algorithm Of the Mgmentioning

confidence: 99%

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Practical Analysis and Design of a Battery Management System for a Grid-Connected DC Microgrid for the Reduction of the Tariff Cost and Battery Life Maximization

et al. 2018

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“…Replacing the switching function (8) into the sliding surface (9) gives Equation (18), which enables calculating the closed-loop inductor current given in Equation (19):…”

Section: Equivalent Dynamics and Parameters Designmentioning

confidence: 99%

“…Averaging Equation (19) within the switching period, using the small ripple approximation [43], gives Equation (20). Then, replacing Expression (20) into the averaged differential equation of the DC-bus voltage (5) leads to Equation (21), which describes the dynamic behavior of the averaged DC-bus voltage under the action of the SMC:…”

Section: Equivalent Dynamics and Parameters Designmentioning

confidence: 99%

Design and Control of a Buck–Boost Charger-Discharger for DC-Bus Regulation in Microgrids

et al. 2017

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Abstract:In DC and hybrid microgrids (MG), the DC-bus regulation using Energy Storage Devices (ESD) is important for the stable operation of both the generators and loads. There are multiple commercial voltage levels for both ESD and DC-bus; therefore, the ESD voltage may be higher, equal or lower than the DC-bus voltage depending on the application. Moreover, most of the ESD converter controllers are linear-based, hence they ensure stability in a limited operation range. This paper proposes a system to regulate the DC-bus voltage of an MG accounting for any voltage relation between the ESD and the DC-bus voltage. The proposed system is formed by an ESD connected to a DC-bus through a bidirectional Buck-Boost converter, which is regulated by a Sliding-Mode Controller (SMC) to ensure the system stability in the entire operation range. The SMC drives the Buck-Boost charger-discharger to regulate the DC-bus voltage, at the desired reference value, by charging or discharging the ESD. This paper also provides detailed procedures to design the parameters of both the SMC and the charger-dischager. Finally, simulation and experimental results validate the proposed solution and illustrate its performance.

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An efficient power sharing approach in islanded hybrid AC / DC microgrid based on cooperative secondary control

Dehaghani

Taher

Arani

2021

Int Trans Electr Energ Syst

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The increasing penetration of AC and DC loads and renewable energy resources as distributed generations (DGs) in electrical power grids, hybrid AC/DC microgrid concept has been taken into consideration as one of the future grid structures. In this article, an islanded hybrid AC/DC microgrid including AC and DC subgrids, which are connected to each other through bidirectional converters, is considered. Bidirectional interlinking converters in hybrid AC/DC microgrid have an important role in power sharing among AC and DC subgrids. Hence, coordinated power control schemes based on AC frequency, DC voltage and common bus voltage are used in the control system of these converters. On the other hand, the primary droop control method is implemented in AC and DC subgrids to share the power among DGs, which causes frequency and voltage deviations in AC subgrid and voltage drop in DC subgrid. In order to tackle these problems, secondary control methods based on distributed cooperative control are proposed in both AC and DC subgrids. By these secondary control methods, which use a communication graph among DGs, a complicated communication network and central controller are not required and the system reliability is increased. Therefore, the accurate voltage and frequency regulation and active and reactive power sharing in AC subgrid, as well as voltage regulation and proper current sharing in DC subgrid are obtained. The effectiveness of proposed secondary control methods for the hybrid AC/DC microgrid is validated in comparison with an available consensus control method by simulation results conducted in MATLAB/SIMULINK software.

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Distributed Control Strategy for Autonomous Operation of Hybrid AC/DC Microgrid

Cited by 27 publications

References 25 publications

Practical Analysis and Design of a Battery Management System for a Grid-Connected DC Microgrid for the Reduction of the Tariff Cost and Battery Life Maximization

Practical Analysis and Design of a Battery Management System for a Grid-Connected DC Microgrid for the Reduction of the Tariff Cost and Battery Life Maximization

Design and Control of a Buck–Boost Charger-Discharger for DC-Bus Regulation in Microgrids

An efficient power sharing approach in islanded hybrid AC / DC microgrid based on cooperative secondary control

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