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IEEE Std. 1584 specifies that capacitors must be part of the arc-flash study. The software tools generally adopted for analytical studies are not suitable for the calculation of the arc-fault incident energy in the presence of capacitor banks. The reason for this deficiency is that the model of the electrical network is only valid for the analysis of short circuit currents at the fundamental frequency...
The MPSS (multiport power supply system) is consist of fuel cell, super capacitor and two DC/DC converters. The energy management scheme, along with the allocation principle of energy storage unit is analyzed. The paper establishes the mathematical model and proposes a composite control strategy. The strategy fuses subsection PI (Proportional and Integral) control and SMC (Sliding Mode Control) based...
A passive lossless snubber for soft-switching Bidirectional Buck/boost Converter (BBC) is proposed in this paper. Although the conventional lossless snubbers can effectively alleviate the switching losses during turn on and turn off transients, they can be applied to only the unidirectional converters, but not a bidirectional converter. On the other hand, the proposed lossless snubber is able to improve...
This paper proposes a concept of two-terminal active capacitor implemented by power semiconductor switches and passive elements. The active capacitor has the same level of convenience as a passive one with two power terminals only. A control strategy that does not require any external feedback signal is proposed and a self-power scheme for gate drivers and the controller is applied to achieve the...
This paper proposes modulation and control strategy for a single-phase to three-phase (1p-3p) indirect matrix converter (IMC) drives. The 1p-3p IMC is composed of a singlephase current source rectifier (1p-CSR) and a three-phase voltage source inverter (3p-VSI). The 3p-VSI is operated with modulation strategy similar to that of a common inverter. The 1p-CSR must be operated with a restriction where...
This paper deals with the AC and DC dynamic voltage control in a hybrid DC/AC Microgrid (MG) with central and distributed Battery Energy Storage Systems (BESSs), applying a power sharing mechanism between the different devices in the MG. The MG is composed by a multiport transformation center and two fixed frequency 3 phase AC Nanogrids (NGs) coupled to a DC bus through 3-phase Power Electronic Converters...
The main purpose of this paper is to develop a DC voltage controller with AC power ripple compensation for single phase ACDC converter, which is served as the front-end converter for an energy storage system. Due to the single phase ACDC converter circuit topology, the AC and DC side both exist power ripple with doubled grid frequency. In conventional controller, DC voltage is controlled to be a constant...
In this paper, effect evaluation on Electric double-layer capacitor (EDLC) based energy storage system installed at Seibu Shinjuku Line in Japan has been carried out. Regenerative-braking energy contribution is improved by adjusting voltage setting of start-charging and start-discharging. Proportional relationship of charged energy and ambient temperature is observed which could be depending auxiliary...
In this study, we report the development result of a supercapacitor as a power supply system for wireless sensor network (WSN) systems. Our supercapacitor is an electric double layer capacitor (EDLC) using an environmentally friendly electrolyte, which is made of a potassium hydroxide (KOH) solution and a charcoal and a steel plate. The EDLC using a charcoal, a steel and KOH as element materials (charcoal...
This paper proposes an energy storage unit integrated dual input PV system with distributed maximum power point tracking (MPPT). Through applying a symmetrical configuration, the proposed PV system has a single stage structure to implement voltage boosting and inversion, which contributes to the advantages such as compact size and high power conversion efficiency. The design of the control strategy...
Energy storage cells have been widely used in many applications. Depending on the application, energy storage cells are connected in series to match the voltage requirement. Each the energy storage cell has individual differences such as internal impedance and self-discharging, which cause cell voltage imbalance. This paper proposes a switched capacitor voltage equalizer. The proposed equalizer combines...
This paper proposed a new soft-switched non-isolated bidirectional converter for energy storage systems. The hard-switched non-isolated bidirectional converter is improved with additional soft-switch cell incorporated with auxiliary active switches, diodes and passive elements. The main operating characteristics of this topology are to transfer the power flow in both directions from low voltage to...
This paper proposes a novel control scheme for hybrid energy storage system(HESS) in electric vehicles. The HESS above is composed of two parts: fuel cell (FC) and super capacitor(SC). FC, as the main power supply, provides a large proportion of required power. Whereas, SC, as the auxiliary energy storage source, plays a great role when starting and braking an electric vehicle(EV). Both energy sources...
High power pulsed power supply is the basis of electromagnetic emission. In this paper, the capacitor voltage limit mode and non-linear resistor voltage limit mode power pulsed power supply are common models. In this paper, two circuit modes based on high temperature superconducting (HTS) pulsed transformers were introduced and the working principle were analyzed respectively. In accordance with the...
A grid-connected inverter with energy storage and active DC-link voltage balancer circuit is presented. The system is implemented with two identical 100kW three-phase converters. The operating limits of the system under asymmetric grid currents with the given hardware architecture are considered and solutions for symmetrisation of the DC-link are proposed.
The paper discusses an issue of the voltage balancing in the intermediate DC circuit of a three-level converter system for a smart grid application. A combination of two methods of the voltage balancing is presented in the paper. The voltages of DC-link capacitors, depending on the operating mode, are controlled by the three-level grid connected AC/DC converter or by the two level DC/DC converter...
This paper presents a new power supply consisting of an inverter and a power factor correcting stage with an integrated active energy storage for servo drives. The energy storage is realized with a capacitor and a DC-DC-converter. This enables the power supply to reuse the braking energy of servo drives instead of losing it in a braking chopper resistor. The main advantage is the simple integration...
Piezo-electric harvesting systems have proved to be a promising alternative to batteries for supplying portable devices. Recent trends focus on the reduction of the size of piezo-electric transducers through the development of nanostructured materials which exhibit output power levels in the order of few microwatts as well as maximum open voltage sources lower than 2 V. In this paper, we propose a...
To improve the dynamic performance and the anti-disturbance capability of the photovoltaic energy storage system, a control strategy of the bidirectional DC-DC converter based on Linear Active Disturbance Rejection Control (LADRC) is proposed in this paper. Firstly, the mathematical model of the bidirectional DC-DC converter is established. And then, the double closed-loop control strategy based on...
Energy storage is anticipated to play an important role on future surface combatants as specialized weapons and sensors systems are introduced, which may require high power and fast ramp rates over short periods of time. The energy magazine (EM) concept has been proposed as one approach for incorporating these types of systems into future, as well as existing, platforms. The EM is envisioned as a...
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