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For power converters used in renewable energy systems, output-impedance design has become an important design consideration for minimizing the impacts of low-frequency harmonic current on the lifetime of ripple-sensitive energy sources such as fuel cells and photovoltaic cells. In the literature, various methods are proposed to tackle this design issue but they are frequently treated in isolation...
This paper presents a new energy and power management control strategy for battery electric vehicle (BEV) with supercapacitors (SCs) based on speed command and acceleration estimation. The purpose of the control strategy is to increase the capability of regenerative braking energy capturing and to improve DC bus voltage regulation. The control strategy uses cascade voltage and current control of SCs...
This paper presents an active power filtering (APF) method to reduce battery ripple currents negative to battery lifetime extension, in hybrid energy storage system (HESS) based electric vehicles (EVs). Deriving theoretical basis, the DC bus current is decomposed by improved Fast Fourier Transform (FFT) in real time, without knowing the driving cycle profile. With integration of motor information,...
This paper proposes bidirectional cascaded quasi-Z-source dc-dc converter (BC-qZSC). Compared to the traditional cascaded quasi-Z-source network (C-qZSN), the diodes in C-qZSN are replaced by active switches with a parallel diode. BC-qZSC has the higher boost ability and the lower input current ripple than those of the bidirectional quasi-Z-source dc-dc converter (B-qZSC). In this paper, the operational...
In this paper DC-AC differential inverters, which are capable of stepping-up the DC voltage in a single-stage, are studied. Due to the reduced number of devices, they are compact, efficient and low cost. Due to their unique characteristics, they can be used in many applications such as PV, UPS and fuel-cell. This paper introduces a new control method which utilizes a different set of voltage references...
A novel quasi-Z-source dc-dc converter is proposed in this paper. Compared with the conventional Z-source dc-dc converter, the proposed converter features high voltage gain with lower voltage stress of the impedance network capacitors and has common ground for input and output. Moreover, both the input source current and output load current of the proposed converter are continuous, which provides...
A modified Z-source dc-dc converter is proposed in this paper. Compared with the conventional Z-source dc-dc converter, the proposed converter can obtain higher voltage gain with lower voltage stresses of switch and the impedance network capacitor and operate with wide-range load. Therefore, the proposed Z-source dc-dc converter not only has lower cost but also has smaller weight and size. The operating...
In this paper, the average behavior of a bidirectional AC-DC converter is analyzed and simplified to an equivalent single-switch model. Based on this single-switch model, new current sensorless control without any current loop is developed and implemented. Compared with the conventional multi-loop control, the proposed current sensorless control is able to regulate DC-side voltage and yield sinusoidal...
The paper proposes a method of modeling and simulation of Solar Photovoltaic (SPV) arrays, interface between two dissimilar toolboxes in MATLAB and different control schemes for the converter control. This paper also shows the simulation of the SPV in Trnsys. The main objective is to find the non-linear I–V equation by obtaining the curve at three points, open circuit, maximum power and short circuit...
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