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The accuracy of PV array model directly affects the output characteristics of the PV system. In this paper, a simplified engineering model for PV array is established and the influence on the output characteristics of PV array is analyzed when Rs, Rsh and α, β, γ change. According to the actual data of a PV power station, the shuffled frog leaping algorithm (SFLA) is adopted to identify the parameters...
The photovoltaic (PV) array is one of the main components of the PV system, and the accuracy of the PV array model is directly related to the validity of the simulation results. The parameters of the PV array may change with the operation conditions. Therefore, it is important to identify the parameters of the PV array model according to the measured data. In this paper, the conventional four-parameter...
A method to extract an equivalent array of dipole-moments model from only the magnitude data of near-field scan is proposed. The method can extract both magnitude and phases of the equivalent dipole-moments by using the nonlinear least square (NLS) method, although the information used for source modeling is limited to only the field magnitudes. The truncated singular-value decomposition (SVD) method...
Memristive devices have been shown to have low leakage power, non-volatile storage capability and high storage density. In addition, by using stateful logic approaches, hybrid CMOS nano-crossbar arrays offer functionalities such as arithmetic operations, which make them ideal target for in-memory computing. Multiplexers are useful circuits that are used in a wide variety of applications such as encoding-decoding,...
Approximate memory is a promising technology for emerging recognition, mining and vision applications. These applications require the processing of large volumes of data to achieve energy-efficiency with negligible accuracy loss. This paper proposes a multi-level approximate memory architecture based on data significance analysis. In this architecture, a memory array is divided into several separated...
The effect of mutual coupling on the direction-of-arrival (DOA) estimation using sparse arrays of dipole antennas is investigated. The open circuit method is used to model the mutual coupling. DOA estimation performance in the presence of mutual coupling is compared and contrasted for different array configurations, namely, uniform linear arrays, minimum redundancy arrays, nested arrays, and co-prime...
The sparse solver is a critical component in circuit simulators. The widely used solver KLU is based on a pure column-level algorithm. In this paper, we point out that KLU is not always the best algorithm for circuit matrices by experiments. We also demonstrate that the optimal algorithm strongly depends on the sparsity of the matrix. Two sparse LU factorization algorithms are proposed for extremely...
Vector-matrix multiplication dominates the computation time and energy for many workloads, particularly neural network algorithms and linear transforms (e.g, the Discrete Fourier Transform). Utilizing the natural current accumulation feature of memristor crossbar, we developed the Dot-Product Engine (DPE) as a high density, high power efficiency accelerator for approximate matrix-vector multiplication...
A non-contact TSV fault detection method is proposed using capacitive coupled probing. The proposed method detects TSV faults by eye-pattern diagrams of extracted EM-modeled transfer characteristics. The TSV and a capacitive coupling is modeled using full wave analysis. Because the measurement is conducted by moving one top probe without contact alignment, it can achieve the fast detection. Moreover,...
This paper proposes a control strategy for a single-stage, three-phase photovoltaic (PV) system connected to a distribution network. The control entails obtaining the maximum power point of the PV system by means of a control strategy that is based on an inner current-control loop and an outer DC-link voltage regulator. The current-control mechanism decouples the PV system dynamic from those of the...
In an effort to reduce the overall read/write power consumption in emerging memory technologies, efficient read/write schemes have recently attracted increased attention. Among these emerging technologies is the memristor-based resistive random access memory (ReRAM) with simpler structures and capability of producing highly dense memory through the sneak-path prone crossbar architecture. In this paper,...
Passive crossbar memories based on resistive switching bit-cells are today seen as the most promising candidates for flash memories replacement. However, inherent sneak currents through unselected devices lead to low operating margins and over-consumption during read and programing operations. Crossbar memory simulations with bit-cells based on two terminal nonlinear selectors, also show degraded...
In case of the grid connected transformerless photovoltaic (PV) inverter, the leakage current through the parasitic capacitance of the PV panel can cause very serious electromagnetic interference problems. In this paper, a more accurate high frequency PV array model is proposed. It includes the influence of PV frame, mounting rack, solar cell material and area. Based upon that model, the common mode...
Analyzing the performance of satellite photovoltaic (PV) array before launch and in space missions is crucial for energy balance and missions success. This study proposes a specific method to predict the electrical characteristics of body mounted solar array for microsatellite. Based on limit data provided by manufacturers and semiconductor band gap, the equivalent circuit model and its parameters...
Electrical mismatch between modules in a PV array due to partial shading causes energy losses beyond the shaded module. This occurs because unshaded modules are forced to operate away from their maximum power point in order to compensate for the shading. Here we present an irradiance estimation algorithm for use in a mismatch mitigation system. Irradiance is estimated using measurements of module...
We show that plane waves can fully “tunnel” through a thin metallic layer perforated with a two-dimensional subwavelength array of tiny holes, assisted by a pair of lossy and active sheets in front and behind the screen. The required conditions for eliminating reflections (no back-scattered power) and shadow (no change in the field strength behind the screen) as well for full tunneling of energy are...
The System Assembly and Modelling framework in CST STUDIO SUITE allows the construction of an entire system consisting of antenna (or multiple antennas), matching or feed networks, and the environment at a schematic and three-dimensional level. From this system level description studies can be derived which allow the user to focus on individual stages of the design, e.g. the antenna on feed network...
In this paper a design for a broadband, light weight and low cost smart shield frequency selective device is proposed. The device consists of a dual layer printed circuit board patch array and is capable of absorbing WLAN signals in the frequency range around 5.5 GHz, whilst allowing almost unitary transmission outside this range, for example the GSM frequency band ranging from 0.8 to 2.1 GHz. Therefore...
Partial shading on PV modules reduces the generated power of the PV system than the maximum power generated from each module separately. The shaded PV module acts as a load to unshaded ones which can lead to hot-spot. To alleviate the effect of partial shading, bypass diodes should be connected across each PV modules. Connecting several PV modules together produces multiple peaks (One global peak...
In this paper, an effective and efficient equivalent dipole-moment method is proposed to predict the radiated emission from PCBs mounted in a shielding cavity. The equivalent dipole-moment model consisting of magnetic and electric dipole array based on near-field scanning is used to replace the PCB to mimic the radiated emission with the presence of the shielding cavity. To improve the simulation...
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