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Islanding is a special type of open circuit fault where the distributed resource continues to feed local loads during loss of mains situation. This paper develops a technique to detect islanding in a six bus power system. The input to the technique is dependent on synchrophasor measurement. The decision made in the technique is based on IEC62116 standards and predefined threshold and of current phasors...
Large dv/dt and di/dt due to power device fast switching within a DC-fed voltage-type PWM inverter of high power density and high-efficiency motor drive system for electric vehicle (EV) always introduce unwanted high frequency noise current through parasitics/distributed parameters of the motor drive system. The complete test setup for conducted-EMI emission from the AC motor drive system of EV are...
To improve the design and test of main circuit of aerospace power inverter, a dynamic testing technique is proposed in this paper. Through high speed signal acquisition and isolation, monitoring and evaluating the voltages and currents changing process of main circuit, the design parameters can be optimized based on the testing results which can improve the reliability and electromagnetic compatibility...
Multi-phase permanent magnet synchronous motors (PMSM) are widely used in electric vehicles owing to their merits such as high efficiency, high precision and high reliability. This paper presents a novel dual measurement vector injection method (DMVIM) for dual three-phase PMSM using two hall-effect DC link current sensors. The principle of phase current reconstruction method is described as well...
Driving a high current-high power brushless direct current (BLDC) motor is not as simple as driving smaller one. Simple block commutated control will not adequate due to interaction of high current and parasitic components. The high current aspect requires careful consideration not only in components selection and printed circuit board design but also in control scheme. This paper will show the effect...
The paper deals with a single-switch IGBT open-circuit faults diagnosis of a two-level voltage inverter supplying an induction motor controlled in a direct rotor field oriented system. The proposed transistor failures diagnostic algorithm is based on an analysis of an estimated rotor flux as well as a measured stator current space vector in a stationary reference frame. The analyzed solution ensures...
This paper presents a method to measure the frequency dependent impedance of an electric machine to calculate the additional losses caused by inverter output voltage harmonics. These losses are calculated by combining the calculated inverter output voltage spectrum and the measured frequency dependent impedance of the machine.
This paper presents new findings on phenomena contributing to flicker and voltage variations caused by grid-connected photovoltaic (PV) inverters. The voltage variations caused by two different 6 kW single-phase grid-connected PV inverters were studied during climatic variations by varying their grid-coupling impedance. Two different methods for characterizing the PV-plant induced voltage variations...
This paper presents a novel method for detecting open circuit faults in electric drive systems. The method is based on oversampling of the phase currents during the zero voltage vector. It is independent from any parameter sensitivity and current sensor errors. Furthermore, the detection can be done within the next sampling time after the occurence of the fault. It allows a determination of the back...
This paper presents a 500MHz-BW −52.5dB-THD Voltage-to-Time Converter (VTC) in 28nm CMOS. A two-step transition inverter raises the VT conversion gain to 100ps/V which is >10× higher than a conventional current-starved inverter. The number of required inverter stages is reduced to 4 from 64, resulting in 1/8 conversion latency and thus 13.2dB THD suppression at 500MHz full Nyquist. A test-chip...
The expected development of grid monitoring applications and control functionalities in low voltage distribution networks calls for advanced simulation tools for performance assessment of these applications. Power hardware-in-the-loop simulations form a cost effective approach to accurately capture the (dynamic) system behaviour. This paper describes the development of a data acquisition and processing...
In this paper the comparison between the Fast Dynamical Reconfiguration (FDR) algorithm and the Exhaustive Search Reconfiguration (ESR) algorithm is presented and discussed. Both algorithms are designed with specific reference to the Series-Parallel (SP) architecture. Moreover, in order to identify the optimal configuration, both algorithms need the knowledge of the I-V characteristics of the N PV...
The local control of inverters and compensators, based on measurements of the power system and calculation of the optimum current to be injected into each phase, has been tested in simulation and implemented in hardware with a rating of 24 kW, with results as predicted by the general power theory. The approach is scalable for ac and dc systems.
More and more energy is fed especially by decentralized converters from renewable energy sources into the grid. Therefore, it is important to know the grid behavior at a wide frequency range from the fundamental frequency up to the kHz-range. This paper presents an advanced impedance medium-voltage measurement system with a high frequency range for an electrical medium-voltage grid. A sinusoidal current...
In this work we present results of investigations on the usability of ISOPLUS SMPD SiC-MOSFET phase-leg modules for medium-frequency resonant inverters. These modules combine excellent thermal performance, very low parasitic inductances and good switching performance with the benefits of surface-mountable packages. In the first step, a SPICE and a thermal simulation of a half-bridge inverter using...
Development and research for power converters is focused on high power density, high modularity, low costs as well as high reliability and efficiency. The use of multilevel converters, like Neutral Point Clamped (NPC) Converters, in high power applications in the range of 1.5 MW up to 6MW can be favorable because of the filter size reduction and therefore reduction of weight and total volume of the...
Three-phase converters are common in modern power systems in interfacing of renewable sources and for improving power quality. A three-phase converter, whether operating as an inverter or active front-end, produces a varying common-mode voltage when conventional sinusoidal PWM is used. Frequency components of the common-mode voltage are located at the switching frequency which ranges usually from...
To support the integration of more PV sources with utility grids, there is a need for low cost and efficient power electronics converters. In this paper, the structure of cross-switch multilevel inverter (CRM) is proposed to interface more than one PV modules with a resonant converter. CRMs treat each pair of PV modules as one unit during the positive and negative half cycles and this could go against...
In electric vehicular (EV) traction drives, Silicon Carbide (SiC) devices promise large savings in volume and weight of the converter system, especially when an inverter is combined with a boost DC/DC converter. Such a system has been designed, implemented and tested as a laboratory prototype. Detailed information on the component design is given and the prototypes characteristics are compared with...
Performance monitoring and fault detection systems are becoming more common in large photovoltaic (PV) plants as they can contribute to decreasing operation and maintenance costs, as well as for maximizing plant yield and lifetime. However, in case of residential and smaller commercial PV system applications the cost of the performance monitoring hardware and implementation is still high. Therefore,...
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