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Nowadays, renewable energy technologies, such as solar power and wind power, are trend to replace conventional energy resources. In the meantime, DC Microgrid is becoming popular in distribution systems due to the better compatibility and simpler system control strategy. This paper presents a hierarchical coordinated control strategy for DC Microgrid with wind turbine and photovoltaic array under...
In this paper, the control design of new Eco-friendly microgrid based on Wind/Diesel/Battery is investigated. Wind turbine (WT) driven variable speed permanent magnet brushless DC generator (PMBLDCG) is tied to the DC bus through three phase diode bridge rectifier and a DC/DC boost converter. Perturbation and observation technique (P&O) is used to achieve maximum power point tracking (MPPT) from...
This paper proposes an islanded hybrid microgrid system with dual voltage source inverter (DVSI) using instantaneous symmetrical component theory (ISCT) for reference current generation and power management. In this work a reduced DC link voltage has been achieved and efficient, simple power management algorithm (PMA) which takes account of load shedding and off-MPPT operation is proposed under islanded...
Hybrid energy storage system (HESS) facilitates the integration of various energy storages (ESs) with different ramp rate. Virtual capacitive control (VCC) is used to ensure the idle condition of supercapacitors (SCs) when HESS is in steady state and dynamic power sharing in transion. Improved virtual capacitive droop (IVCD) is proposed in this paper by introducing DC bus voltage regulation for batteries...
This paper presents the real and reactive power flow control with cascaded multilevel converter (CMC) in the grid. A distribution static compensator (DSTATCOM) is connected at the point of common coupling (PCC) supported from CMC via cascaded transformers. Instantaneous symmetrical component scheme is used to generate the reference current for the compensator. In multilevel inverter the ramp comparison...
This paper presents a novel strategy for a hybrid energy management system consisting of a photovoltaic (PV) array, a polymer electrolyte membrane fuel cell (PEM-FC) as energy sources and Lithium ion (Li-ion) battery as an auxiliary energy storage. Such hybrid combination brings the reliability, redundancy and an overall energy efficiency in the system. DC-DC converters are used to interface PV-FC-battery...
The multi-megawatt grid connected photovoltaic (PV) system studied in the paper includes parallel arrays and power electronic units, each with their own DC-DC and DC-AC converters. In one configuration, the DC-AC converters of adjacent parallel sections are connected in cascade, in order to effectively operate as a multilevel inverter, thereby reducing the filtering requirements. Grid voltage oriented...
In the recent years, microgrids have become increasingly popular among the consumers due to its energy efficient mechanism, network benefits and improved energy reliability. However, when they are operated as autonomous systems, several technical problems related with its operations and control has emerged as a challenge. To overcome this impending issue, this paper proposes an optimized approach...
Integration of wind and solar within dc microgrids into buildings is presented. First, a cache control method is applied to utilize a hybrid energy storage which combines diverse but complementary storage technologies. Second, an adaptive droop scheme is proposed to provide coordination control of a battery in real-time and long-term operation. Compared with other existing droop controls, it is distinguished...
With the development of Distributed Energy Systems the dynamic support of Microgrids Energy Quality is of great importance an optimized operating scheme for a grid-connected based photovoltaic (PV) system is analyzed. The proposed model comprises of a PV plant with lead acid batteries (LABs) Energy Storage coupled to the grid by means of a three-phase inverter (VSI). The PV plant and the battery storage...
Regulation of load voltage and frequency is very important in standalone wind energy system under fluctuating wind speeds and changing load conditions. This paper presents vector control strategy for load side inverter in coordination with battery energy storage system for maintaining power balance, voltage and frequency regulation in stand-alone wind-energy system under different operating conditions...
This paper presents a modified approach for the control of DC voltages and State of Charges (SOC) of batteries in an interconnected cluster of DC microgrids. First, the model of a DC microgrid is reviewed, and then the proposed control method is presented. This method is composed of two compensation terms that are introduced in the secondary control level in the hierarchical control framework of the...
The power coordination in DC microgrids has a vital role in enhancing the performance and management of multi generation units. Renewable Energy Sources (RES) are limited to their available power with intermittent nature. Battery-based energy storage sources have limitations in the charging and discharging capabilities to avoid depleting the battery and preserve the State of Charge (SOC) within its...
This paper focuses on battery charging/discharging through a converter tied to the DC link. PV and wind energy power system are used as sources. This work aims to develop a model that depends on the state of charge of the battery to decide its state of operation. The filter and converter design has been carried out and simulation results have been reported. The paper looks into the aspects of system...
With the aim to improve the energy management of battery packs in stand-alone power supply applications, a simple but effective model-based algorithm for battery state estimation has been developed. The method can be classified into the category of PI-based observers and exploits a Thevenin-based equivalent circuit to model the battery behavior associated with a simple start-up identification process...
This paper studies four voltage dependent solutions for modulating the charging of multiple Electric Vehicles (EVs) in a real Danish network. Uncontrolled EV charging, especially in grid with high EV penetration, can result in overloaded lines and transformers, low-voltages and other performance degradations which lead to poor quality of supply. Therefore, a decentralized control for modulating the...
A hierarchical energy management system (EMS) for a residential power router is proposed to further reduce costs and stabilize the voltage of a load. There are ten modes of the EMS including three grid-connected modes and seven islanding modes. The state machine diagram shows the transition into and out of these modes. These transitions are based on switching criteria, over generation conditions,...
This paper proposes a novel modular dual-active-bridge (DAB) dc-dc converter for spilt-battery energy storage system (BESS) in medium-voltage dc (MVDC) grid application. Compared to modular cascaded DAB converter, the proposed topology has current-fed DAB characteristics, with directly dc current control to achieve dc fault ride-through capability. In addition, the proposed converter exhibits favorite...
Battery cells or modules are usually connected in parallel to build up large current and to increase system reliability. However, charge imbalance among parallel-connected battery cells or modules is very common and results in circulating current, which increases energy loss, shortens battery life, and even incurs fire hazard. Thus, charge balance or equalization among battery cells or modules is...
Performance of Solar Photovoltaic (PV) system suffers from intermittency due to variable weather conditions and thus it faces challenges to penetrate into the electricity network. To mitigate this difficulty and power fluctuations at the load end, a possible solution could be the integration of battery energy storage with PV system. The Storage system can potentially improve security, quality, reliability...
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