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Datacenters are becoming a significant energy consumer and ideal candidates to operate as virtual power plant (VPP). In order to provide reliable power, datacenters are provided with on-site generators and large backup resources. These resources are designed to provide power during grid failure, therefore they are underutilized most of the time. In addition, load demand of the datacenter is flexible...
The prospective spread of Electric vehicles (EV) and plug-in hybrid electric vehicles arises the need for fast charging rates. High required charging rates lead to high power demands, which may not be supported by the grid. In this paper, an optimal power flow technique of a PV-battery powered fast EV charging station is presented to minimize the operation cost. The objective is to help the penetration...
Plug-in Hybrid Electric Vehicle (PHEV) control strategies have received much attention in recent years for their significant impact in reducing the overall fuel cost. Dynamic programming (DP) is a control method which calculates every possible outcome at each step to find out the optimal supervisory control trajectory. In this work, DP is applied to a PHEV control strategy using a backward looking...
In this paper and integrated battery energy management algorithm for optimal control of power and energy of a medium voltage feeder is discussed. The proposed unique control algorithm enhances coordination of two main storage applications, viz., Photo-Voltaic Capacity Firming (PVCF) and electric Energy Time Shift (ETS). Optimization of control parameters and set points are considered for management...
The battery energy storage systems (BESS) using modular multilevel converter (MMC) as the grid interfacing converter could integrate multiple independent battery stacks with flexible control capability by assuming the unique circulating current control scheme. Traditionally, the separate battery stacks in MMC are controlled to have the same state of charge (SOC) for maximizing the operational capacity,...
Energy storage systems based on Lithium-ion batteries have been proposed as an environmental friendly alternative to traditional conventional generating units for providing grid frequency regulation. One major challenge regarding the use of Lithium-ion batteries in such applications is their cost competitiveness in comparison to other storage technologies or with the traditional frequency regulation...
Lithium-ion (Li-ion) batteries are found nowadays not only in portable/consumer electronics but also in more power demanding applications, such as stationary renewable energy storage, automotive and back-up power supply, because of their superior characteristics in comparison to other energy storage technologies. Nevertheless, prior to be used in any of the aforementioned application, a Li-ion battery...
Modular multilevel converters with storage devices integrated in the submodules are emerging topologies for traction drives. This paper proposes a new state-of-charge control technique to optimally utilise supercapacitor cells that are connected to the sub-module capacitors by means of boost DC/DC converters. The proposed strategy ensures that the charging/discharging trajectory of all the supercapacitor...
A real-time battery model capable of accurately predicting the battery hysteresis effect is critical for a model-based battery conditional monitoring algorithm in advanced battery management systems. Battery condition monitoring involves tracking changes in physical parameters and operational states such as state of charge (SOC) and state of health (SOH) to ensure the optimal operation and safety...
This paper proposes a fault-tolerant three-level T-type topology and fault-tolerant control strategy for inverter system. The fault isolating circuit, a fault-tolerant bridge and a redundant fourth-leg are added to the original T-type topology, providing the inverter with fault-tolerant capability. A fault isolating circuit is used to isolate the faulty leg quickly, eliminating its influence to other...
Connecting renewable power plants to the grid must comply with certain codes and requirements. One requirement is the ramp rate constraint, which must be fulfilled in order to avoid penalties. As this service becomes compulsory with an increased grid penetration of renewable, all possible solutions must be explored especially that large battery energy storage systems are still expensive solutions...
This paper presents a modular switched-capacitor (SC) dc-dc converter based electric drive system for battery electric vehicles. In such a system, modularized lithium-ion battery cell tied MOSFET SC converters are used instead of the more conventional IGBT boost converter. Following the drive train architecture, the modeling approach for each electrical component, including the battery set, dc-dc...
This research elaborately investigates an innovative work for high-accuracy SOC estimation using an adjusted experimental discharging/charging voltage (EDCV) signal of series/parallel-cell configured battery pack through combination between adaptive sliding-mode observer (SMO) and discrete wavelet transform (DWT). The steps for robust SOC estimation in the proposed approach as follows. First, after...
The battery energy stored quasi-Z source cascaded multilevel inverter (BES-qZS-CMI) based photovoltaic power generation system combines advantages of the qZS inverter, the cascaded multilevel inverter, and the battery energy stored system. However, State of Charge (SOC) imbalance between battery modules will affect the whole system performances. This paper proposes a control method to balance the...
This paper proposes an optimal power management approach to reduce the operating costs by managing the power flows in a photovoltaic (PV)-diesel generator hybrid nanogrid with batteries. The proposed algorithm utilizes dynamic programming (DP) technique to optimize the power flows in the system to meet the load demand, achieve maximum utilization of the solar energy available, minimize fuel consumption...
This paper provides a comprehensive study on the life test method of the retired xEV(PHEV/HEV/EV) battery pack for smart house energy storage applications. First, the paper proposes a detailed model for a energy management system supported smart house. By utilizing historical household load data and Photo Voltaic (PV) panel power generation data, a 96-hour close-to-real mission profile of the battery...
A microgrid is an energy subsystem composed of generation units, energy storage, and loads that requires power management in order to supply the load properly according to defined objectives. This paper proposes an online energy management system for a storage based grid-connected microgrid that feeds a critical load. The optimization problem aims to minimize the operating cost while maximizing the...
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...
Electric springs based on power electronics have been proposed as a demand response method for stabilizing power grid fed by substantial intermittent renewable energy sources. Associated with energy storage, they can provide active and reactive power compensation. Due to the limited storage capacity of the battery, this project explores a new control scheme for the third version of the electric springs...
Installing the battery energy storage in the interlinking converter of hybrid AD-DC grid can effectively reduce the exchanged energy of hybrid grid and therefore reduce the losses. Being different from the two-level or three-level interlinking converter for low voltage grid application, this paper proposes an interlinking modular multilevel converter (MMC) with integrated battery energy storage for...
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