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This paper examines the problem of generating testing actions for electronic industry test systems designed for verification of electronic packages of UHF band. This paper shows complex problems of setting amplitude and time parameters of multichannel generators of test signals. The problems of multichannel wide range signal generation and frequency control, rise and fall time control, pulse time...
This paper proposes seamless frequency synchronization scheme for fast mode switching of parallel grid-connected inverters operated by droop control in stand-alone mode to grid-connected mode. The proposed scheme analyzes the phase difference between the grid and the inverter for fast frequency synchronization and predicts the synchronization time for frequency increase and decrease. By selecting...
This paper proposes a control schema for permanent magnet machines, which is synthesized by field-oriented control, synchronous pulse width modulation and phase-lock loop based sampling synchronization. Switching frequency of inverters in electric locomotive applications is limited by considering switching losses. Lower switching frequency deteriorates performance of machines, e.g., extra machine...
Targeting the development of a silicon carbide (SiC) inverter for electric vehicle/hybrid electric vehicle (EV/HEV) applications, the design considerations of the gate driver for the adopted SiC metal-oxide-semiconductor field-transistor (MOSFET) power modules are presented. Given the system power density requirement, the gate driver design challenges for the commercial off-the-shelf (COTS) SiC modules...
Cascaded or distributed module-level inverters are becoming increasingly desirable for photovoltaic applications. The authors have demonstrated an AC-stacked topology that allows each inverter to operate completely autonomously from all the others. The only required communications is a low-bandwidth synchronization signal communicated from the point-of-grid-connection. This paper describes the communications...
Modular multilevel converters (MMC) are emerging to be an alternative approach for realizing power converters for a variety of high power applications because they allow series-cascaded levels and/or parallel-connected branches. However, the design of communication interface between system controller and individual modules became increasingly complicated as more modules been added into the system,...
Parallel inverters are commonly adopted in high power applications, for instance wind energy system, smart transformer, and power conditioners. Meanwhile, interleaved PWM is usually considered as an optimal approach to reduce the current ripple and harmonics of the parallel inverters. However, in case of a common dc-link, the problem of circulating current emerges and leads to performance degradation...
In this paper, a new critical-conduction-mode (CRM)-based modulation is proposed for three-phase inverters. With this modulation, soft switching is achieved and the efficiency of the inverter is improved, especially for high frequency operation with SiC MOSFET. In three-phase string PV inverter applications, by operating at switching frequency above 300 kHz, power density of the inverter is estimated...
This paper proposes optimal switching period phase-shifted method for slave inverter to reduce grid current ripples in synchronized two parallel three-phase grid-connected voltage-source inverters (VSI). In parallel operation, a 180 degree phase shifted method generally takes of advantage of reducing grid current ripples in same DC-link voltage for each grid-connected VSI. However, in case of unequal...
This paper presents three three-phase AC-DC configurations in which two are unidirectional and have reduced switch count. The investigated topologies have one DC-link and are composed by two converters in series connection through transformers, that process part of the total power, while the conventional converters have two DC-links and a transformer processing all the power. The replacement of switches...
This paper analyzes multi-switching network transmission synchronization (MSNTS) problem among three uncertain chaotic systems with unknown parameters. By constructing the effective switching rules, the definition of MSNTS is given and the synchronization schemes are proposed to reach synchronization between any different states of each derive system and any desired states of every respond system...
Half wavelength AC transmission (HWACT) is a promising technology with unique advantages in the field of large power transmission over long distance. However, there is little study on the grid connection of HWACT, which shall be an important technical point for its engineering application. This paper deals with the point-to-grid connection of an HWACT line. Firstly, the requirements of grid connection...
The clock synchronization technologies applied to controlling layer and primary equipment like intelligent switchgear of processing layer in intelligent substation are analyzed in this paper. IEEE1588 message timing mode, which can be accurate to nanosecond, is used as the mode of substation system, in order to fulfill the real-time and accuracy requirements of intelligent switchgears and remote control...
Time-Sensitive Networking (TSN) is becoming more important in automotive and industrial sectors. There is no clear strategy how to use TSN to improve and migrate the established real-time protocols without excluding legacy devices. This paper presents a realistic concept to integrate TSN into automation networks. We choose Sercos as a deterministic Industrial-Ethernet protocol to be extended with...
The paper presents modeling and simulation programme of the synchronize conditions for synchronous generator in the thermal power plants. The programme is utilized for educational purposes in the laboratory “Electrical Section of Power Plants” for the conditions study and the practical skill moulding to the thermal power units interconnected. Are studied the synchronize conditions and the admissible...
A model of input data buffering in measuring systems is developed. The authors obtained the formulae to determine the following time intervals: between two successive transactions to signal source, two successive transactions to signal receiver, between transactions on data receiving and generation, between transactions on data generation and receiving. It is shown that an adequate model of the buffered...
Literature has shown that the interface circuit plays an important role in a piezoelectric energy harvesting (PEH) system. By referring to the general model of synchronized multiple bias-flip (SMBF) and the recent implementation of parallel synchronized triple bias-flip (P-S3BF), this paper introduces a new implementation called parallel synchronized septuple bias-flip (P-S7BF) for further enhancing...
In the process of China's automated production, the upgrading and networking of old infrastructures becomes one of the key issues. With large quantity, numerous varieties and wide distribution, these infrastructures brings complex design work and high cost to network them into fieldbus, which greatly hamper the building of intelligent factories. This paper proposed an industrial-control solution to...
The network plays a key role in High-Performance Computing (HPC) system efficiency. Unfortunately, current HPC routing solutions are not application-aware, and therefore cannot deal with the sudden HPC traffic bursts and their resulting congestion peaks.To address this problem, we introduce Routing Keys, a scalable routing paradigm for HPC networks that decouples intra- and inter-application flow...
This paper investigates a high power factor switch-based wireless power transfer front-end circuit for heterogeneous systems. This circuit uses an integrated switching rectifier, implemented in 0.18um 1.8V/5V CMOS process. An integrated pair of phase synchronizers is used to align the waveshape of a wirelessly-coupled sinusoidal voltage source in the receiving coil to the corresponding conducting...
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