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A low-power and high-accuracy current driver IC is proposed for portable electrical impedance tomography (EIT) systems. The proposed IC supports active electrode configuration and has three key features. First, high output impedance current driver is implemented with phase compensation scheme through a delay-locked loop (DLL) to significantly alleviate a phase shift and a required power consumption...
Microgrid research and development in the past decades have been one of the most popular topics. Similarly, the photovoltaic generation has been surging among renewable generation in the past few years, thanks to the availability, affordability, technology maturity of the PV panels and the PV inverter in the general market. Unfortunately, quite often, the PV installations are connected to weak grids...
With rapid increase of photovoltaic (PV) penetration in distribution system, and the fact that distributed generators may involve in voltage regulation according to IEEE standard 1547, it is necessary to check the stability of PV generator integration, especially utility PV farms. To apply generalized Nyquist Criteria (GNC) based on impedances on D-Q frame, output impedances of PV farm is derived...
A detailed conducted EMI prediction model of the three-stage starter/generator is proposed in this paper to analyze the EMI during the starting procedure. The main generator and exciter high-frequency (HF) models are represented by multistage LRC networks. The traditional low-frequency (LF) models in d-q reference and the corresponding control strategies are combined with the HF models through the...
This paper presents results that demonstrate the effects of fulgurites on the earthing system of a power system. The importance of grounding in power systems cannot be over emphasized. Although studies of fulgurites have been done in the past, no research work has reported on the impact of fulgurites on electrical grounding. The backfill materials used to enhance an earthing system play a pivotal...
Evaluation of relay misoperations provides an opportunity to improve the design of backup protection schemes. Existing generator station backup protection schemes use distance protection (21) or voltage controlled/restrained overcurrent protection (51V) elements for clearing phase faults that are not cleared by either line protection or generator protection. Many schemes also use transformer ground...
This paper presents a low power, high resolution bio-impedance sensor IC for respiration monitoring application. It contains the dual path instrumentation amplifier (DPIA) including current reusing transconductance amplifier and high gain transimpedance amplifier for high resolution, low power and wide input range bio-impedance measurement. Measured results show that the proposed readout circuit has...
This paper examines resonant characteristics of the transmission line compensated with the Static Synchronous Series Compensator. Frequency-domain characteristics of the line impedance are studied to evaluate whether the SSSC can cause electrical resonance in the line, hence the potential to excite subsynchronous resonance (SSR) in neighboring turbine-generator plants. Detailed studies are performed...
In regard to the influence of AC mains cable termination on radiated emission, we compared and analyzed the simulation results in single-wire and 3-wire line configuration by round-robin testing with a comb generator and tower PC. The analysis result demonstrates that the deviation with 25-ohm and 150-ohm termination and the deviation with a comb generator and a tower PC using a very high frequency...
This article presents an analysis of several instances of induced voltages in indoor ground installations as a result of the generation of nanosecond pulses of the electromagnetic field. Four different object geometries were established and the influence of some parameters such as the impulse speed, distance, or antenna characteristics was analyzed.
This paper discuss about effect of traction substation for high speed railway in Indonesia. The purpose of this paper is to obtain magnitude of voltage and current unbalance due to traction substation that perceived by system and generator adjacent to traction substation. Analysis is performed by doing simulation of 5 scenarios in simple system model that created in power system simulation program...
As negative incremental resistance caused by constant power behavior of power converters may bring stability problem to distributed systems, stability of PV integration to distributed system attracts more and more attention. Compared to the widely used positive impedance method, D-Q Frame impedance matrix method is more accurate for integration of PV generator that has non-symmetrical control in DQ...
This paper deals with the characterization of the immunity of integrated circuits (ICs) to conducted electromagnetic interferences (EMI). In particular, it focuses on how to optimize the direct power injection (DPI) test bench for highly reflective low voltage devices under test (DUTs). The enhancements concern the whole injection setup, from the EMI generation up to the test printed circuit board.
This paper presents a method for voltage stability monitoring based on the maximum power transfer to the load. The only required information is the system topology, the data from PMUs and the operational status of synchronous generators. With this information, the Thevenin impedance seen from a load bus can be estimated and by using the Thevenin theorem for maximum power transfer an impedance based...
Although electroporation protocols are common in biomedicine and biotechnology, the fundamental molecular-scale mechanisms involved in electroporation are still not completely understood. Therefore, molecular dynamics (MD) simulations of small patches of planar lipid bilayers (PLB) and experimentally formed PLB are used to model the cell membrane and to explain the electroporation process. However,...
Power quality is an important issue for wave energy developers, as the wave energy converters output power profile can present fluctuations in the range of seconds, due to the oscillatory nature of the ocean waves. The impact of these devices on the electric grid hence needs to be investigated for wave farms to be connected to the grid. In order to emulate an operating direct drive wave energy converter,...
In this paper the calculation scheme of the transducer of contact type with a piezoelectric element of a diskform is considered. The transducer emits the elastic waves in a massive metal plate. The transmission coefficient of the electrical to mechanical side of the piezoelectric disc is calculated. It is shown that for the effective operation of the transducer at high frequencies, it is necessary...
This paper presents a converter-based permanent magnet synchronous generator emulator as a testbed for designing, analyzing, and testing of the generator drive and its control system as an actual device under test. The permanent magnet synchronous generator model is formulated in a real-time digital simulator. A voltage type ideal transformer model combined with a virtual impedance is presented as...
This work suggests some new solutions to TDR-based liquid level detectors. A 3D-printed waveguide cylinder has been designed in order to increase the sensitivity of the level measurement. By wrapping the probing waveguide-pair around a cylinder, an inclination angle ϕ is introduced which increases the time-of-flight by a factor of 1/sinϕ and hence the level resolution is increased (by the same factor)...
The wireless power transfer systems (WPTS) work at frequencies between 20 kHz – 40 MHz. Considering the system consisting of two magnetically coupled coils, used in WPTSs, as a passive linear two-port network (PL2PN) in harmonic state, this paper describes the possibility of using the scattering parameters S in generating the power gains between the two ports of these coils. The amplification (or...
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