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Grid connected Voltage Source Converters (VSCs) with LCL filters usually have voltage measurements at the filter capacitors, while it can be important to control the active or reactive power injection at the grid-side of the LCL filter, for instance at a Point of Common Coupling (PCC). Synchronization to the PCC voltage can be obtained by Virtual Flux (VF) estimation, which can also allow for voltage...
To optimize the lifetime of switching power semiconductors, this paper presents improvements in the performance and coordination of a control system to regulate power device junction temperature, Tj, and its change during power cycles, ΔTj. This research proposes a ΔTj control law which closes a control loop on the rate of change state, Tj, and subsequently introduces active thermal capacitance and...
Intravenous infiltration is a condition wherein an infused solution leaks inadvertently into soft tissue surrounding a hypodermic needle site. This occurrence affects approximately 6.5% of patients in hospitals worldwide, and can lead to severe tissue damage if not treated immediately. The methods currently used by medical staff to detect an infiltration are subjective and can potentially be prone...
This paper demonstrates the capabilities of software intelligence against hardware intelligence, real-time data acquisition using third party instrument like PLC and PPC-SSR as final control element. The experimental setup is a two tank non-interacting level control system and from these tanks; level of second cylindrical tank is to be control using a feedback control loop i.e. single analog level...
Measurement Systems Analysis (MSA) is a challenge in an Automated Testing Environment (ATE). Currently, there is no standard procedure on performing a Test MSA, which can either be statistically weak by being too simplistic or be too complex that it makes it difficult to deduce conclusions. This project aims to create a standard Test MSA that generates statistically-sound conclusions without the need...
The sensing circuits are very important devices to measure for both current and voltage magnitudes of the systems. This paper presents a new sensing circuit design with significant advantages for DC voltage systems. The proposed sensing circuit is capable to measure currents and voltages by means of one current transducer and resistor network of voltage measurement. The accuracy and reliability of...
The most important parts of the smart meters are the sensing devices that are utilized to measure for both current and voltage magnitudes of the systems. Therefore, several investigations have to be carried out to improve practical applications of the smart metering systems. This paper presents a novel sensing device design for AC measurement systems. The proposed sensing system is firstly designed...
An efficient monitoring system and communication framework for energy usage and consumption monitoring in a microgrid is the basis for any development of energy optimization policies. It also enables costs reduction and fast problem detection. Distributed Smart Energy Meters are becoming more and more useful in commercial, industrial and domestic domains, in particular when they are conceived as low...
We present herein a compact wattmeter clamp for measuring electric field and magnetic field in monoconductor and multiconductor cables. The clamp allows the diagnostic of low voltage and low frequency equipments. This device performs the electric and magnetic field measurement surrounding a multiconductor power cable and permits to deduce amplitude, phase and position of each conductor in the cable...
An estimation framework is presented that improves the robustness of GPS-denied state estimation to changing environmental conditions by fusing updates from multiple view-based odometry algorithms. This allows the vehicle to utilize a suite of complementary exteroceptive sensors or sensing modalities. By estimating the vehicle states relative to a local coordinate frame collocated with an odometry...
This paper presents design and simulation of CMOS circuits intended for on-chip differential-mode charge based capacitance measurements in the femto-farad range. The circuits can be integrated with MEMS sensors in CMOS-compatible technology. The reported circuits are characterized by very high sensitivity and a linear C-V response. The performance of differential CBCM circuits using simple current...
A three phase digital energy meter developed using Digital Signal Processor (DSP), for measurement of energy consumed by three phase load, ensures energy conservation and maintains high accuracy. This paper presents a simple and cost effective design of three phase digital energy meter, without compromising the power measurement quality. It uses a voltage and current signal conditioning circuit and...
Rogowski coils (RCs) are usually used for high current measurements from low frequency up to high frequency of a current waveform. These precise and sensitive measurements are very susceptible to interference. A metallic shielding was often used as one of possible solutions. Influences and efficiency of RC shielding to measurement are investigated in the paper. Measurements were carried out for two...
In this paper, an automated battery test bench is proposed. The proposed bench consists of circuit breaker unit, uninterruptible power supply unit, system load unit, twelve battery research channels, distribution device, heat chamber, computerized control measuring device and communication device. The bench allows to perform thermal, resource and electrical tests of several lithium-ion batteries simultaneously...
The quasi-distributed sensor allowing measuring of steady-state temperature fields has been proposed. The sensor comprises of thin sensing resistive elements arranged in grid structure. The sensor can be used in the system wherein only external boundary is available for measurement equipment connection such as PEMFC membrane electrode assembly. The proposed sensor can be adapted to measure other physical...
Accurate localisation of an indoor robot critically depends on the odometry calibration which varies with different types of floor surfaces. Motion control accuracy of robots can be improved by independently calibrating odometry parameters for each floor surface [1]. This paper presents a new robot floor classification system based on motor current measurements with compensation for variations in...
This paper proposed an oscillator-based ultrasonic sensor interface that can be applied to intravascular applications. The readout circuits are validated with a capacitive micromachined ultrasonic transducer (CMUT) and a current-to-frequency chip. The CMOS CMUTs are integrated with a current amplifier on the same chip and the current-to-frequency chip provides the current-to-frequency readout interface...
In this paper, an automated battery test stand is proposed. The proposed stand consists of circuit breaker unit, uninterruptible power supply unit, system load unit, twelve battery research channels, distribution device, heat chamber, computerized control measuring device and communication device. The stand allows to perform thermal, resource and electrical tests of several lithium-ion batteries simultaneously...
Conveyor systems allow quick and efficient transportation for a wide variety of materials, which make them very popular in the material handling and packaging industries. Many kinds of conveying systems are available and used according to the various needs of different industries. Adjustable speed drives are used for the operation of the conveyors used in a number of industries. We can use adjustable...
This paper discuss the design and implementation of Sigma-Delta Analog to Digital converter (ΣΔ A/D converter) within an FPGA for a moderate current sensing application. Although FPGA do not posses such analog interface but it is possible to implement an ADC inside an FPGA by taking advantage of the low voltage differential signaling (LVDS) receiver inside the FPGA With a minimum number of external...
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