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Nanogrids are the building blocks of a microgrid which is powering a single building. Low voltage DC distribution system within building structures is called a LVDC nanogrid. DC electronic loads like LED Lights, BLDC fans, PC, battery system and renewable sources can be connected to the nanogrid. LVDC nanogrid is a low power DC distribution system suitable for residential applications with an efficient...
A comparative analysis of the plug-in fuel cell vehicles (PFCV) is studied regarding different topologies, drive cycles and control strategies. To improve the performance of the PFCV, an optimization strategy is proposed at first by regulating the power distribution between the battery and the PEMFC system. Then, a direct multiple shooting (DMS) algorithm is used to solve this nonlinear programming...
Energy storage systems (ESSs) usually are used to keep active power and frequency stable in the microgrid, especially in the autonomous microgrid. Some factors often happen just like time-varying topology and channel noise in actual communication network. This paper uses multi-agent system and every agent represents an energy storage unit. This paper chooses the battery energy storage system (BESS)...
This paper introduces a high-power-density low-profile dc-dc converter for cellphone battery charging applications. The converter delivers 40 W across a 4:1 input voltage range with a nominal input voltage of 12 V and a nominal output voltage of 4 V. The PCB area of the converter is limited to 80 mm2 and the component height is limited to 1 mm. Three alternative topologies — a zero-voltage switching...
In today's electric vehicles (EV), power density is a key criterion for electrical systems, due to the strongly limited available space. Thereby, a high integration level of the electric distribution network is inevitable. In this paper, a novel multi-port multi-cell (MPMC) topology is proposed, which combines the features of two independent two-port converter systems, which are commonly used in state-of-the-art...
Isolated grid-connected inverters are typically constructed of two stages, namely a voltage-source inverter stage and an isolated bidirectional dc-dc converter stage. Recently, two dual-bridge isolated series resonant dc-dc converters are used to synthesize segments of the line current and reconstruct the complete sinusoidal line currents using a three-phase unfolder. The unfolder technique synthesizes...
Supercapacitors (SCs) are also known as Electric Double-layer Capacitor (ELDC) or Ultracapacitors. In the high voltage applications, the supercapacitors are connected in series, so that the voltage imbalance will occur because the SCs are not identical. This different parameters of the cells caused by many factors for instance the internal parameters of supercapacitors (Capacitance, Equivalent Series...
This paper presents an architecture for digitally managing dc power distribution within a building using a network model, a system for simulating specific systems, and results from initial use of the model. The architecture implements the Local Power Distribution model [7] based on networks of nanogrids, with local prices as the mechanism for determining the direction, magnitude, and timing of power...
This paper proposes a novel integrated power system for electric vehicles (EVs) to improve the power density and efficiency at a less cost. It integrates the on-board charger (OBC) and the low-voltage DC/DC converter (LDC) by common use of semiconductor devices, capacitors and magnetic components. Therefore, the volume and cost of the integrated system is reduced compared with the conventional two...
Climate change and Greenhouse Gas (GHG) emission reduction efforts have generated an interest in microgrid research due to its ability to integrate renewable energy sources and storage to existing grid infrastructure. Economizing microgrids through use of DC microgrids has become a major research focus. This paper proposes a novel converter topology that offers high-efficiency, reduced filter requirements...
Wireless Power Transfer (WPT) is considered as a plugless alternative for Electric Vehicle (EV) charging. In WPT concept induction or magnetic coupling techniques are considered as suitable methods for EV charging. In this study, WPT system for EV is discussed and simulated. An intelligent WPT system is introduced and simulated to charge EV. This system is able to align transmitting coil with receiving...
The Performance of battery packs is highly affected by imbalances between the series connected cells that provide the required string voltage. A modular battery implementation based on cascaded converters can have advantages over traditional centralized battery systems with add-ons active/passive balancing techniques. This paper investigates the use of a modular battery integrated within a cascaded...
This paper presents an integration of a battery support to a single phase grid with a solar PV system. The unique control of multi-functional voltage source converter achieves controlled charging and discharging of the battery. The implemented converter achieves the extraction of maximum power from varying solar PV array further maintaining the battery current control within acceptable limits. The...
The article raises the question of the relevance of the use of multiport converters in autonomous power systems. Advantages of this type of converters are given, structure of multiport converter and its control system are reviewed, consider the structure of a three-port converter and automatic control system, explained the algorithm of this system. Also mathematical model that describes converter's...
The demand of a reliable, sustainable, and resilient electrical energy grid motivates the integration of renewable energy-based resources based on different technologies. New network structures are essential in approaching these goals. Low and medium voltage DC grids could introduce a key answer in this context. In this paper, the operation of 380 V DC distribution grids for different applications...
Multi-output converters are widely used in various electronic devices and Electric Vehicles (EVs) due to their benefit in terms of cost, efficiency and space for installation. On the other hand, Wireless Power Transfer (WPT) methods including Inductive Power Transfer (IPT) and Capacitive Power Transfer (CPT) have been applied increasingly in EVs since they are more convenient and safe as compared...
This paper proposes a design of cascaded DC-DC converters for transferring energy from solar panels to loads in standalone cases. The storage units are connected to the proposed system via the converters to solve the instability of the renewable power source. The voltage levels of the power supply, storage and the load are different to each other in the design. Single-switch simplification is utilised...
The Cascaded H Bridge (CHB) is a superior topology to integrate PV panels into the grid. However, due to the internal uncertainty power supply of renewable sources, it is difficult to arrange the PV CHB inverter to meet the system scheduling requirement. To overcome this limitation, a CHB inverter topology with both PV arrays and energy storage elements is proposed in this paper. In order to simplify...
DC-DC converters are used as secondary power sources. There are many different topologies of such converters, each of which has its own advantages and disadvantages. It is also possible to combine them in order to ensure a more reliable power supply. This paper presents the new scheme of multiple port DC-DC converter and its simulation results in three operating modes.
Bidirectional power flow, reactive power compensation capability and high efficiency are essential for vehicle to grid (V2G) systems. In this paper, a single-phase/single-stage bidirectional AC/DC converter for V2G application is presented, which consists of a line frequency commutated unfolding bridge and an interleaved buck-boost stage. In addition to sinusoidal input current, bidirectional power...
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