IEEE Transactions on Industry Applications

This paper focuses on analysis and modeling of CMOS RDAC (resistive digital-to-analog converter) potentiometers, based on string DAC (digital-to-analog converter) or Kelvin divider architecture. The model is developed by using VHDL-AMS language and accurately simulates basic static and dynamic parameters, integral non-linearity, terminal voltage operating range and leakage current at various opera... View full abstract»

The advent of microgrids paved the way for energy decentralization and self-sufficiency among consumers. Reciprocating engine driven synchronous generators (also known as gensets) are one of the most commonly found distributed energy resources (DERs) installed in a microgrid. A key concern in microgrid operation is the frequency regulation, especially when it is islanded from the main grid. In rec... View full abstract»

This paper presents an optimal design approach for dual-active-bridge series resonant converter (DABSRC) based on frequency domain analysis. The proposed design technique ensures efficient performance of DABSRC over a wide range of voltage gain and load variations. Operating principle of the converter is detailed to illustrate both ZVS and ZCS operations during bidirectional power transfer. Modeli... View full abstract»

Arc resistant low/medium voltage switchgear and motor controls continue to provide proven levels of additional personnel safety in most every petroleum and chemical facility. The Institute of Electrical and Electronics Engineers (IEEE) and International Electrotechnical Commission (IEC) generated testing guides and standards for these products which are open to some level of interpretation when ap... View full abstract»

Widespread deployment of Voltage Source Inverter (VSI) units in high penetration applications like distributed generation and stand-alone renewable energy conditioning imposes stringent demands on reliability and output voltage regulation. Reported literature provides numerous solutions for output voltage regulation, which includes twin aspects of command tracking and output impedance control. Mos... View full abstract»

This paper proposes a decentralized control scheme for controlling active and reactive power of grid-tied AC-stacked PV inverter architecture using single member phase compensation. Reactive power control is required for the next generation of gird-tied smart PV inverter systems in highly penetrated power networks. Decentralized control scheme proposed in this paper allows fully distributed archit... View full abstract»

When the wind power accounts for a large portion of the islanded microgrid power, it may need to support the ac bus frequency regulation. The increasing penetration of variable speed wind turbines (WT) in microgrids leads to a lower inertia, as the rotational speed of the turbine and the grid are decoupled by power electronic converters. Lower system inertia results in a larger and faster frequenc... View full abstract»

The exploration result of an increase in power electronics converter based variable speed drives for industrial applications reveals the impact of inverter induced bearing current on the prevailing electric machine failure. The bearing current associated with drive systems are concerned about operating frequencies of the solid-state semiconductor switches which may cause the electrostatic charge b... View full abstract»

Harmonics have been considered as one of the major issues in future power grids. With the increasing demand in advanced control functions, power electronic converter interfaced distributed generators (DGs) are expected to perform harmonic compensation when necessary. It has been demonstrated in a number of studies that DG converters operating in voltage-controlled mode (VCM) can be easily configur... View full abstract»

There have been many discussions on the importance of balanced power supply for both best performance and for lower vibration during operation of industrial motors in petrochemical duty and related installations. Results of tests that were conducted on several low voltage IEEE 841 motors to observe the effect on vibration due to unbalanced power supply. Various increments of voltage imbalance from... View full abstract»

Electric vehicles (EVs) and their application raise new questions and demands. Accordingly, the charging process of EVs is a novelty in everyday life when using such vehicles. This paper presents results of user charging behaviour within a field test. In the field test, 500 people with above average yearly mileage took part in integrating the vehicles into their everyday lives. For the results of ... View full abstract»

Synchronous reluctance machines, including the permanent magnet assisted variants are competitive motor topologies if the application requires high efficiency and a cost effective solution with a high flux weakening capability. However, increasing operating speeds incur challenging design and development decisions, mainly in order to find design solutions that ensure the machines structural integr... View full abstract»

A robust controller design for the voltage control of an autonomous three phase voltage source converter (VSC) is proposed. As compared to the conventional PI controllers, fractional order controllers make the VSC system robust due to their fractional characteristics. The fractional $PI\lambda$ controller has an additional degree of freedom $\lambda$ View full abstract»

This paper describes the IEC type A (AC only) ground-fault detection circuit and its limitations in accurately detecting electrical ground-fault currents in today's modern electrical installations. Discussed are the effects of waveform modifying power sources and the effect of the DC component on the efficacy of type A safety devices. Limitations of UL1053 standard for ground-fault sensing ... View full abstract»

Atmospheric microplasma has a potential to be one of the technology used to purify the indoor air. For example, plasma is used for pollutant decomposition or sterilization. In this study, we examined the removal of hexadecane by using microplasma. Hexadecane is contained in diesel oil and it discharge to the air as exhaust gas. A decrease in the concentration of hexadecane from 3000 ppm to 105 ppm... View full abstract»

In recent years, the deterioration of IAQ (Indoor Air Quality) became a big concern. Because indoors is the place where we spend most of our life, IAQ is an important factor to be considered for a comfortable and healthy living. In this study, we evaluated the products and decomposition process of hexadecane in small and large capacity space by using microplasma electrode. In the case of hexadecan... View full abstract»

In this work the spatial electro-thermal modeling and simulation of power electronic modules is discussed. It is shown how physical and mathematical modeling techniques can be combined to obtain a compact time efficient electrothermal simulation framework for power electronic modules. The accuracy of the modeling framework is demonstrated based on experiments. It can be used for the fast calculati... View full abstract»

The goal of an incident energy analysis is to determine the largest incident energy that a worker could be exposed to at a piece of electrical equipment. This is most commonly done using the IEEE 1584 method. It is a common observation when performing this analysis that minor variations in fault current can result in large changes in a protective device's operating time and the resulting in... View full abstract»

With increasing renewable distributed energy resources integrated into a microgrid (MG), it is difficult to realize its optimal operation due to various uncertainties, e.g., power outputs of wind turbines and photovoltaic cells. This paper presents a flexible scheduling model for the optimal operation of an MG, in which the expectation of operational cost and the robustness of scheduling solutions... View full abstract»

The Series-Resonant dc-dc converter (SRC) is widely applied in a large range of voltage and power. In most applications, fault tolerance is a highly desired feature and it is obtained through redundancy. This paper proposes a fault tolerance solution for the SRC, which could drastically reduce the need of redundancy. Using the proposed scheme, the full-bridge based SRC or multilevel based SRC can ... View full abstract»

Cascaded bidirectional dc-ac converters are commonly used in UPS application and battery chargers for electric vehicles (EV). A bidirectional dual active bridge cascaded three phase converter (DABCC) with six pulse dc link is proposed for applications like line interactive UPS and EV. Power conversion units for such applications employ large electrolytic capacitor at high voltage DC bus. Through a... View full abstract»

This paper describes a demodulation approach based on the least squares method for a saliency-based position estimation in slowly sampled field-oriented control systems. The proposed approach focuses on the sensorless control of electrical drives in which the sample rate of the control task is chosen slower than both the maximum possible update rate of the phase voltages and the maximum possible s... View full abstract»

This paper presents a DC/DC buck-boost converter topology with high voltage gain and dual outputs. Unlike many of the high step-down / step-up DC/DC converters, this topology uses relatively less number of LC components and three active semiconductor devices, switched in a non-overlapping way. Due to the duty cycle limitation, high gain (typically more than 4) is very difficult to achieve in a sin... View full abstract»

This paper presents a comprehensive state-space dynamic model of a future power distribution system for plug-and-play interface of distributed renewable energy resources and distributed energy storage devices. The system, called the FREEDM system, comprises of multiple solid-state transformers (SSTs), and load, generation and storage connected to each SST in a distributed network. The system allow... View full abstract»

The cost of rare earth (RE) permanent magnet along with the associated supply volatility have intensified the interests for machine topologies which eliminate or reduce the RE magnets usage. This paper presents one such design solution, the separately excited synchronous motor (SESM) which eliminates RE magnets, however, but does not sacrifice the peak torque and power of the motor. The major draw... View full abstract»