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The applications of Li-ion batteries used in energy storage system (ESS) in building environment is drawing more and more public attention and it is predicted to hold the most share of battery market in the year of 2020. In this paper, an equivalent circuit battery model for the ESSs applications in building environment is proposed, and the parameters are extracted experimentally. A new methodology...
This paper presents a dynamic model predictive voltage control (DMPVC) method for the single-input dualoutput (SIDO) flyback converter. In this converter, cross regulation is one of the most critical issues because its primary winding is shared by its secondary windings so that the two output voltages are interacted with each other. The proposed method has the ability to reduce cross regulation significantly,...
For a Li-ion battery based energy storage system, the state of energy is a key index for the energy management and operation optimization. In the actual Li-ion batteries based energy storage system in building environment, the varying load current will lead to the estimated battery's residual energy deviated from the real value. To solve this problem, an equivalent circuit model is presented for the...
In recent years, there is growing interest in improving lithium-ion battery state monitoring. This is due to growing concern over ensuring reliable and safe operation of lithium-ion based energy storage system especially in automotive and stationary e.g. UPS in data center applications. In this paper, battery state of charge estimation based on Extended Kalman Filter (EKF) and improved battery model...
This paper analyses the parameter dependence during the charging process of a Vanadium Redox Flow Battery (VRB) for a system-aware green data center which has distributed sources of energy production and amenable to flexible load scheduling. One of the key features of a flow battery is the ability to control the flow rate and current during the charging process. The flexibility however has a direct...
In recent years, electric propulsion systems have increasingly been used in land, sea and air vehicles. The vehicular power systems are usually loaded with tightly regulated power electronic converters which tend to draw constant power. Since the constant power loads (CPLs) impose negative incremental resistance characteristics on the feeder system, they pose a potential threat to the stability of...
This paper deals with a fast current control for a novel axial flux permanent magnet machine based on model predictive control. This machine, called flywheel enegy storage system, is controlled to function as a fast-response energy storage device. Fast acceleration or deceleration is required for fast storing and releasing energy respectively. Therefore model predictive control method, which can pre-calculate...
This paper presents a position-sensorless field-oriented control of a novel axial flux permanent magnet machine for flywheel energy storage system. The approach is based on the estimation of the motor induced voltage with the help of measured stator currents and reference voltages. Based on sliding mode observers, rotor position can be accurately estimated. This novel flywheel energy storage system...
The concept of a novel axial flux permanent magnet machine for flywheel energy storage system is presented. Modeling and control of this novel flywheel energy storage system are given. This flywheel energy storage system is designed to work as a fast-response energy storage device which is planned for use in ride-through applications in wind power. Therefore the flywheel has to store and release energy...
This paper numerically studies the inrush current phenomenon in a DC-DC converter with isolating transformer. It uses Jiles-Atherthon method to model magnetic core used in isolating transformer. Due to fast change of switching duty-cycle to suit the load change, magnetic core experiences a large change of flux density, thereby inducing a large inrush current, though the operating point of the magnetic...
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