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This study presents a sensorless control of wind-driven doubly fed induction generators (DFIG) connected to an isolated load. The direct voltage control is adopted to command the rotor side converter. A Model Reference Adaptive System (MRAS) based technique is used in this topology for the sensorless generator speed estimation. The proposed sensorless control system is robust against speed and load...
In this paper we present a microscale “Smart Dust” type system with a volume of 200 μm × 100 μm × 10 μm, called lablet. The lablet contains a 20 Hz low power clock generator, a sensor, electric actuators and a simple finite state machine to implement a predefined response to the sensor input. The system operates with supply voltages ranging from 0.3 V to 1.8 V and is thus suitable to be supplied from...
This paper presents the design of secondary voltage control by tuning the parameters of coordinated PID controllers to eliminate voltage violations in power system contingencies. The coordinated PID control parameters are tuned by using genetic algorithm. The study is presented on modified IEEE 14 bus system. The coordinated secondary voltage control is assigned to the generators and STATCOMs in order...
Microgrids are becoming increasingly popular with consumers. In the near future, many microgrids will be installed for consumers with widely varying energy needs. The most challenging of the requirements for these microgrids is finding a suitable protection scheme that is able to protect the microgrid in both grid-connected and islanded modes of operation. The purpose of this paper will be to provide...
Phase Locked Loop (PLL) is wide used for grid parameters estimation, as well for grid-converters synchronization. Key block at single-phase Synchronous Reference Frame PLL (SRF-PLL) structure is two-phase generator which is used for generation of two quadrature signals, which are necessary for SRF block. One of the issues that could appear during estimation of grid parameters is appearance of DC offset...
This paper describes the power speed characteristics of a novel double-stator permanent magnet generator integrated with a magnetic gear (MG) using 2-D finite element method (2D-FEM). The machine is proposed for low-speed applications and it has a novel structure with two iron ring pole pieces and three permanent magnet rotors consisting of an outer field PM, inner field PM and prime PM. A prototype...
This paper evaluates a micro generator based on a piezoelectric transducer bending mechanism where impact force is being exerted onto the bending beam and hence generating electrical power across an external resistive load. The proposed bending mechanism prototype has been manufactured by using 3D printer in order to conduct the evaluation. A free fall test has been conducted as the evaluation method...
An Outer-PM tubular linear generator has been designed to increase the power density and distance of relative movement. The design of the two buoys has been completed. Detailed design process of the proposed generator is described. Considering the cogging force and voltage, the linear generator has been optimized and final parameters have been determined. The integrated wave converter system has been...
In this paper, we propose a computation technique to compute the power generation performance of a hub dynamo, which is installed in a bicycle. The output power of the hub dynamo is small and it is difficult to accurately predict the power generation performance using 3-D finite element analysis. First, the output voltage of the hub dynamo is computed and is compared with the measured one. Then, the...
In this paper, a software supported DC voltage calibrator is presented, requiring a standard programmable signal generator, a digital voltmeter, and some free software components. After detailed analysis of the programmable signal generator applying an automated process, it is concluded that intrinsic precision is insufficient for the generator to be used as a voltage calibrator. Furthermore, offline...
This paper proposes the out-of-step (OOS) protection system, which operation principle is based on combination of two approaches: equal area criterion, implemented in time domain, is used for generators first swing stability assessment and generation sources electromotive forces (emf) vectors angle control is used for multi swing instability detection. The paper focuses on possibilities of practical...
The goal of this paper is to present a design of a voltage controller via state-feedback control. An efficient power system model to measure voltage and frequency is introduced. The model including uncertainties is admitted to be time-dependent, with a priori known upper and lower bounds. A method to solve the stabilization problem of the power system model subject to uncertain time-dependent parameters,...
This paper presents a study on a jet flow assisted by low net charge ion wind generated from bipolar corona setup, adding momentum to the bulk flow directed alongside the electrodes and focused in the middle of interelectrode space. It was confirmed that with only 27.1 mW of consumed discharge power, the corona helped to focus and increased the flow peak velocity up to 71.6%, i.e., from 1.41 m/s to...
The Pulsed Electro-Acoustic method(PEA) is widely used both in laboratory for fundamental research and in industry for components assessment and diagnosis. It is well known that the electrical stress in dielectrics can be intensified by space charges. In the study, we have modified and upgraded the PEA system for better resolution and safety, which could measure the space charge distributions automatically...
Lightning accidents are frequent in Colombia. In the present investigation, a non-fatal accident is analyzed. For a better understanding of the accident, it was replicated in the laboratory a part of a reported case, in which a soldier, wearing a metallic identification pearl-like necklace, was struck by an indirect lightning current. Different 8/20 μs lightning impulse current amplitudes were applied...
Lightning damages to facilities inside or in the vicinity of wind turbines become remarkably common. Most of the breakdowns and malfunctions of the electrical and control systems inside or in the vicinity of wind turbines are caused by ground potential rise due to lightning current flowing into the grounding system of the turbine and back-flow lightning current due to the ground potential rise. To...
For 1.0V operation NAND flash memory, heterogeneously integrated voltage generator is proposed and experimentally demonstrated. The proposed 2-stage boost converter uses high voltage (HV) transistors of standard CMOS process as the 1st stage and HV transistors of NAND flash process as the 2nd stage. The intermediate load capacitance is adaptively adjusted according to the number of NAND flash chips...
For 1.0V operation NAND flash memory, heterogeneously integrated voltage generator is proposed and experimentally demonstrated. The proposed 2-stage boost converter uses high voltage (HV) transistors of standard CMOS process as the 1st stage and HV transistors of NAND flash process as the 2nd stage. The intermediate load capacitance is adaptively adjusted according to the number of NAND flash chips...
The primary goal of this research was to design the electrical generation and control system for a small-scale solar-thermal collector, which was optimized for the Pacific Northwest. The project team collected data on the existing solar-thermal system and worked to design a power conversion system to generate electricity. Design and implementation of the generator, prime mover, and electric load controller...
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