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In order to efficiently use solar energy to generate electrical power, three-dimensional (3D) Fibonacci number photovoltaic modules (FPMs), which are designed in part based on natural plant leaf arrangements were proposed. It has been also proposed the large-scale power generation systems using multiple FPMs (hereinafter, power generation forests), and shown its power generation characteristics by...
Indirect rotor field oriented control (IRFOC) plays an important role in the high performance induction machine drives. In the indirect rotor field oriented control — based induction machine adjustable speed control system, the rotor field angle is usually obtained by the rotor angular velocity and the slip angular velocity. The rotor angular velocity can be sensed by an encoder with sufficient accuracy...
This paper proposes a new battery management system (BMS) for a series string of battery cells. The proposed control structure is based on a duality of the adaptive droop control theory used in grid / microgrid connected sources. The presented BMS control structure yields higher reliability compared to the conventional ones due to its decentralization features and its communication-less ability. The...
Train cruising movement simulation module is an important part of high-speed train moving simulation system. According to the actual cruising movement characteristics of high-speed train, it is very important to design high-speed train cruising movement simulation algorithm to improve the calculation accuracy of train moving simulation system. Based on the conditions and the characteristics of high-speed...
Overcurrent or overvoltage problems caused by DC line faults endanger the security of modular multilevel converter based high voltage direct current (MMC-HVDC) system. To improve the reliability of fault identification for MMC-HVDC transmission lines, a novel pilot protection scheme based on DC power difference is proposed in this paper. Characteristics of the DC power difference between positive...
An original and modern integrated current sensor is designed and presented in this paper. It can provide a sense current proportional to an output current available to the microcontroller via an external resistor. The ratio between output and sense current is modeled and simulated. The errors between the two currents increase in low currents domain. A solution consisting in a gate back regulation...
Communication traffic continue to improve due to the rapid growth in broadband access in recent years, frequently based on PIN or tunnel devices. The present paper discuses two kind of tunnel devices, in a vertical configuration through the cross-section, allowing the tunnel current flow from upper anode to bottom cathode: PIN and NOI device in a planar technology (p-NOI). Recently, the NOI — Nothing...
Water supply system has characteristics of non-linear, time-varying parameter, large time delay, so its mathematical model changes time by time. Water supply system widely use PID controller to keep constant pressure and PID controller need accurate mathematical model. The system that use PID controller is along with large overshoot, more adjusting time. Fuzzy controller don't need the accurate mathematical...
This work proposes a Fast Response One Cycle Control (OCC) strategy for Active Power Filters (FOCC-APF). Moreover, a comprehensive study of the OCC technique, exploiting their features and inherent drawbacks to provide a better understanding of this technique is presented. Finally, simulation results of the active power filter with the conventional and proposed strategies are shown to evaluate APF...
A novel current mirror sensing based multi-phase current balance developed in Global Foundry 0.18μm CMOS process was presented in this paper. Different from conventional current mirror sensing method, a new bypass branch was added to make the sample signal more accurate in high switching frequency situation. The method was realized in a 2.5MHz four-phase buck converter. As the simulation result shows,...
This paper emphasizes technical and economic parameters at direct-on-line starting of low power asynchronous motors. There are presented a lot of simulations and there are carried out experimental tests, in order to establish deviations which occur between the two methods. On the basis of the mathematical model presented, it is also possible to study other dynamic states: variation of voltage, of...
This paper presents the study, design and simulation of a laboratory module related to filters. With this laboratory platform it was accomplish a comparative study between current feedback (CFA) and voltage feedback (VFA). Because the laboratory platform has an educational role, it was presented some practical aspects of active filters measurement and also the differences between the measured values...
This paper is concerned with the design of a fault estimation scheme with component fault and sensor noise for the three-phase inverter of high-speed trains. To design the component fault estimation observer, the three-phase inverter system states are augmented with the disturbance treated as new states, leading to an augmented and singular system. The observer is designed to generate the needed residual...
In this research, the procedure of the transient traveling wave in non-solidly earthed network is analyzed. It shows that at the bus bar the traveling waves of healthy lines are mainly composed of the refracted traveling waves. The refracted are generated from the backward traveling wave in the fault line, then the refracted traveling waves is the main part of the traveling waves in the healthy lines;...
Noise of the charge pump degrades the in-band phase noise of charge pump phase-locked loop (CPPLL). This paper analyzes the noise mechanism of a bipolar junction transistor based charge pump and validates the analysis through simulation, providing necessary insight into the design of low-noise charge pump for CPPLL-based frequency synthesizers. A simple model for bipolar transistor noise is utilized...
In order to achieve high-quality, high-dynamic power amplification a method is proposed to split and process the current ripple independently from the main bulk current. As a consequence, low-power switching circuits with reduced stress, so-called basic crossover correction cells, can be effectively applied. Comparisons are presented to validate the proposals.
The paper deals with the protective relaying of MV rings recently introduced by e-distribuzione, the largest Italian Distribution System Operator (DSO). The paper refers to an existing MV distribution system which includes a loop line. Attention is focused on Cross-Country Faults (CCFs), i.e. two Line-to-Ground Faults simultaneously occurring in two different phases at different locations. A large...
Memristor is considered as one of the promising solutions to the fundamental limitations of the VLSI systems. Logic implementation with memristor device by considering its compatibility with CMOS fabric provides a new vision for digital logic circuits. This work presents a 2 by 2 multiplier cell design using a hybrid CMOS-memristor universal gate. The universal gate based implementation approach is...
In order to reduce the ripple of DC-link voltage and capacitor current, this paper presents a method to select suitable capacitance for the rectifier (full-wave controlled) and inverter. Meanwhile, a braking unit is developed to prevent the overvoltage of DC bus. The impact of the length of cable, connected between the braking unit and the inverter, is researched from a mathematical point of view...
This paper proposes a method for high-resistance connection (HRC) fault severity detection in a permanent magnet synchronous machine (PMSM), which helps in determining the scheduled maintenance. The proposed method is based on the zero sequence voltage component (ZSVC) and the stator currents. The PMSM mode in abc stationary frame is presented. The relationship between the ZSVC, the stator currents...
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