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This paper demonstrates a multi-stage DC-DC converter to charge a battery with a three stage charging steps and can simultaneously perform the maximum power point tracking (MPPT). The system uses an auxiliary battery together with an bidirectional DC-DC converter to balance the power flow to complement the input solar power and the required power by the primary battery. The hardware prototypes shows...
This paper proposes a new decentralized power management and load sharing method for a photovoltaic (PV)-based, hybrid single/three-phase-islanded microgrid consisting of various PV units, battery units, and hybrid PV/battery units. The proposed method is not limited to the systems with separate PV and battery units, and power flow among different phases is performed automatically through three-phase...
The active residential DC distribution feeder operation under integration of distributed solar photovoltaic generations (DSPVG) is expecting poor voltage profiles due to increasing demand of SPVG and load. This paper discusses, the dynamic droop based coordinated controlled voltage regulation approach to address the rise/drop of voltage in an active DC power distribution system (DCPDS). Modern DCPDSs...
Thanks to incentive policies for the development of solar generation technologies, the world has recorded such an expensive generation technology largely deployed in daily life. It is expected a similar prospect to battery energy storage system (BESS) which is a multi-benefit solution with high penetration of renewable energy in general and solar rooftops in particular. In low voltage networks with...
The control strategies of micro grid is an important topic for micro grid. With the development of DC micro grid, the control strategies of DC micro grid is drawing more and more attention. Nowadays, the most widely used control strategy of DC micro grid is droop control. All the distributed generators and energy storage systems share loads through different droop coefficients in droop control. This...
The increased integration of PV systems in the low voltage network causes many problems in network operations. The EU project STORY is tackling these problems with adding energy storage to the grid. In this paper we present new control concept with peak demand control algorithm which is used on storage unit in LV distribution network. The algorithm development is based on real measurements from transformer...
This paper presents a novel concept for combining network and market or system service-orientated functions in grid storage systems. For this, a network service consisting in local phase balancing for power flows or voltages is considered. This service can be combined with further system or market — orientated services. A theoretical formulation of the converter set-points is provided for the use-case...
This paper explores the interconnection of multiple microgrid with “tie-line”. Tie-line control can be managed to control the power flow from microgrid and voltage at respective microgrid buses at the point of interconnection. Formation of such DC microgrid cluster ensures higher reliability of power supply and flexibility to manage distributed energy resources and loads in the system. Two identical...
This paper compares a non-isolated DC/DC converter (interleaved Buck/Boost) and an isolated converter (Dual Active Bridge) in a bidirectional charging application for Electric Vehicles. Both converters are modeled, controlled using small-signal models, and their operation in several modes is simulated and then compared. The results of the comparison using several criteria related to automotive applications...
This paper reviews the existing structures for converter stages in renewable energy and motor drive systems that offer high voltage gain at the input of an inverter. The inverter may also connect the DC supply to the utility grid. For traction motor drives in vehicle and rail transport and in high-frequency transformer connected grids, bi-directional power flow capability is also required. Cascaded...
The integration of energy storage systems (ESSs) co-located with distributed PV units in LV networks allows increasing self-consumption of energy and supporting DSO for grid management. In fact, ESSs may help the distribution network in reducing the mismatch between demand and PV generation making such power source dispatchable. Here, we perform a Monte Carlo analysis to assess the impact that two...
This paper focuses on the application of BESS (Battery Energy Storage Systems) in improved operation of distribution grids that are highly penetrated with PV (Photovoltaic) systems. The paper features a state-space based model for BESS and implements a simple and effective approach for peak load shaving by considering device constraints. The grid-connected PV+BESS system proposed in this work contains...
According to the control requirements of modular power used in energy storage systems, a parallel control strategy for bi-directional DC-DC converter is proposed and applied to the bi-directional DC-DC converter combined by current-fed half bridge and voltage-fed half bridge. While converters operate in parallel, the master-slave control based on digital communications can solve the problem of unequal...
Recently, Queensland state of Australia has seen a rapid growth in rooftop solar photovoltaic (PV) installations. However, the growth can be throttled due to voltage violation constraints at the distribution feeder level. Consequently, distribution utilities in Queensland have set a guideline for new PV inverter connections. During light load condition and under high availability of PV power, voltage...
This paper presents the analysis and design ofa line interactive uninterruptible power supply (UPS) connected to a microgrid through a high step-up/down(bidirectional) dc-dc isolated modular multilevelconverter with a high input to output voltage ratio.Resonant switching is used on the MMC to improveoverall efficiency of the converter. The input source forthis converter is a set of series and parallel...
In this investigation, some strategies are presented for the optimized provision of reactive power by photovoltaic (PV) systems to perform voltage regulation in a low voltage distribution grid. The optimization is based on an optimal power flow algorithm that determines the minimum amount of reactive power needed for voltage regulation, also resulting in the minimization of losses in the network....
The paper proposed a multi-port active bridge (MAB) converter applied to household energy router (ER), where a multi-winding high-frequency transformer is used for the isolation and energy redistribution. The ER can provide both DC and AC ports with adjustable voltages, thus can be used for various distributed renewable generations and energy storage access. This work also provides simplified equivalent...
The widespread use of renewable energy sources, such as photovoltaic plant, has given rise to a growing interest in direct current microgrid. This paper presents the control strategy developed for a dc microgrid interconnected to the ac grid through a bidirectional front-end converter and composed of energy storage systems, such as batteries and supercapacitors, programmable load and a Photovoltaic...
This paper deals with a power management mechanism using Modular Multilevel Converter (MMC) with integrated energy storage elements, the typical use of which could be a grid-interface for a photovoltaic park or a charging park for electric vehicles. In comparison with the currently commonly used topologies of MMC, which use submodule DC/DC converters to control the submodule voltages at the half-bridge...
The Solid State Transformer (SST) is a revolutionary technology being developed by the authors. It has a tremendous number of features, which include power management, fault management and energy management. Its autonomous and distributed power management capability enables large-scale integration of distributed energy resources (DER) into the power grid. Specifically, it supports AC or DC connected...
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