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We constructed a charge and discharge system for effective utilization of an electric storage device composed of batteries. We verified the system operation by simulation analysis and actual measurement. The simulation analysis showed that it is useful to alternately use two secondary batteries as the lithium ion battery (LIB). From the measurement of 60 cycles, the use of secondary batteries under...
In this paper, considering the change rate of the load, a frequency division control is optimized to improve the control accuracy of hybrid energy storage, compared to the traditional frequency division control. Firstly, the optimal control strategy is designed based on the first power allocation and the second power allocation. Secondly, the model is applied in residential area to avoid the peak...
There are many software can be carried out simulation of photovoltaic (PV) system such as PSIM and Matlab. Those software have their own advantages in the simulation of PV system. This paper proposed a joint-simulation of a stand-alone PV system based on PSIM and Matlab to achieve the maximum power point tracking (MPPT) of PV cells and the stability of PV system. In this paper, the main circuit is...
Islanded DC microgrid is equipped with energy storage unit to balance the power between renewable energy power generation and load. Battery becomes one of the optimum choices for energy storage unit with many advantages. To avoid battery deep charging and discharging and prolong its service life, a multi-source coordinated control strategy for islanded DC microgrid is proposed based on battery's state...
Energy crisis and environmental pollution are a serious threat to human survival and sustainable development. To alleviate the energy crisis and maintain the living environment of mankind, people develop and utilize new energy sources such as solar energy and wind energy. In order to ensure the safe and reliable use of the battery, and improve the performance of the battery after group, the battery...
In this study, we investigate the feasibility of using an electric vehicle (EV) as a power storage device in a power-grid in which photovoltaic power generation (PV) is introduced. In recent years, EV has been of interest from a transportation and domestic power storage point of view. When huge distributed generators are installed in future power systems, more power storage systems should be introduced...
This paper proposes a novel integrated control system including PMSM drive and vehicle-to-grid (V2G) technology based on open winding PMSM. It realizes motor drive mode and bidirectional energy flow for Electric Vehicles in V2G control mode. These modes can be switched easily and smoothly according to commands from integrated controller. Compared with the traditional EVs control system which controls...
This paper proposes a new method to control the frequency fluctuations of the power system with large scale wind farm (WF) installed by using High Voltage Direct Current (HVDC) interconnection and battery systems. The proposed system is designed to decrease the frequency fluctuations. Simulation analysis is performed on a multi-machine power system model composed of synchronous generators (SGs), squirrel...
This paper investigates virtual inertia control for dc microgrids using voltage droop control as the power-sharing strategy. An adaptive virtual inertia control (AVIC) strategy with the variable droop coefficient is proposed to increase the inertia of the dc microgrid. By swinging the droop curve during transient events, the dc voltage change rate is reduced. The variable droop coefficient is modified...
In DC Microgrid, the majority of the loads are connected to the grid via power electronic converters. These loads act as constant power loads (CPLs) when tightly regulated. If the voltage changes, the CPLs behave negative incremental impedance characteristic during dynamic periods, and could cause system instability. To guarantee the system stability and simultaneously maintain the CPLs good performances,...
In this paper, the power flow management algorithms for a power generation system is presented. An Energy Control Unit (ECU) was used to monitor and optimize the power flow from the microturbine-generation to the battery and the load, to improve not only the dynamic performance but also the safety and reliability of the power generation system Finally, an energy management algorithm and its behavior...
This paper presents a multifunctional interface circuit for the battery-ultracapacitor hybrid energy storage system (HESS). Both the voltage equalization of the battery banks and energy exchanging between two kinds of energy source will be realized, by using the appropriate control strategy. Thus the reliable work and the health of the battery bank can be maintained, and the ultracapacitor (UC) can...
In microgrid, the traditional centralized control strategy is a convenient way to realize system control and schedule, but it is completely dependent on communication which reduces the reliability of system, and plug and play is difficult to be realized for the distributed generator (DG). In order to overcome these challenges, this paper proposes a distributed control strategy based on multi-agent...
The combination of residential photovoltaic (PV) panels and battery energy storage system (BESS) is a promising solution in a building's microgrid. This paper presents an optimal energy management system (EMS) to minimize the electricity bill of residential buildings. The objective is to achieve peak shaving and electrical energy cost minimization for the owner, making use of a dynamic energy pricing...
Increasing renewable energy, ESS and digital loads can be combined with DC power distribution to achieve high energy utilization efficiency. Emergency power supply needs consideration to prepare power failure of AC grid due to characteristic of DC distribution system connected with AC grid and digital loads. The application of emergency generators should be considered as the ESS cannot perfectly satisfy...
Lead-carbon Batteries as an energy storage device, its state of charge is an important parameter of the entire battery energy storage system. This paper uses the Improved Thevenin model as the battery mathematical model, and establishes the state-space equations. First of all, it fits the function relationships between the parameters and the SOC. And then it establishes a set of equations combined...
In this paper, a novel three-port converter(TPC) for stand-alone photovoltaic(PV) power system application is proposed, and also presents the control strategy and power management of this converter. This converter uses three power switches, two inductors and switched capacitor structure to obtain a higher voltage gain and reduce the voltage stress of the power switches. The control for the converter...
In this paper, ZVT interleaved bidirectional LDC(IB-LDC) with switching frequency modulation for mild-hybrid electric vehicle is proposed. The IB-LDC is composed of interleaved buck and boost converters employing an auxiliary inductor and auxiliary capacitors to achieve zero-voltage-transition. Operating principle of IB-LDC according to operation mode is introduced and mathematically analyzed. Moreover,...
This paper proposes a new design concept of small air-gap bidirectional Wireless Power Transfer (WPT) system using Dual Active Bridge (DAB) topology. The wireless charging coils are considered as a weakly coupled transformer having relatively high leakage inductance, and thus the new design can obtain soft switching without implementing resonant capacitor or external inductor. This design has a simple...
This paper proposes topology of a magnetically coupled residential micro-grid consisting of a multi-port dc-dc converter and a single phase grid-connected bi-directional inverter. It integrates photovoltaic (PV) and fuel cell energies to supply the residential load via a common high-voltage dc bus linked to a single phase bidirectional inverter. A battery is used to store the surplus energy of the...
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