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A fast and high-efficient sensitivity-based approach for real-time three-phase line flow calculation is proposed in this paper, this approach combines the three-phase power-flow (TPPF) solution techniques with the new sensitivity factor, named three-phase ZBUS distribution factor (TPZBD). The TPZBD is associated with both the changes of real and reactive power injections of individual phase at each...
This paper aims to analyze the dynamic operations of a low-voltage micro grid with various distributed energy resources. The sample system is composed of a low-voltage micro grid with a 30 kVA micro-hydro generator, a 30 kVA diesel engine generator, a 30 kVA gas engine generator, and a 15 kVA micro-wind turbine generator as well as loads. The dynamic models of individual components are established...
Under technological advancement, technology allows human life to be more convenient and safer. This study used LabView as the system development software and the computer on the server side, to develop an intelligent distributed monitoring system for monitoring household electronic appliances. Besides controlling the server-end, network and GSM system were used to construct remote control and monitoring...
This paper proposes an effective approach for planning a load transfer substation pair(LTSP) between two normally closed-loop feeders considering minimization of system power losses. Firstly, the annual equivalent load of each load point is calculated. Then, a genetic algorithm-based (GA-Based) approach has been proposed to solve this optimization problem. The objective is minimization of the annual...
In this research, a multi-function electro-cardiogram measurement system is designed and constructed. The system applies the structure of virtual instrument built by software part, Labview hardware part, DAQ card and some external circuits is applied in the development process. This research integrates different fields that include physiological signals, circuits, virtual instrument, and physiology...
In this research, a new electro-oculogram measurement technique is designed and constructed. The structure of virtual instrument built by software part, Labview hardware part, DAQ card and some external circuits is applied in the development process. This research integrates industry needing oriented technology - physiological measurement of medical industry, advanced technology - virtual instrument,...
In this research, the structure and design of virtual spectrum analyzer is studied. The construction process is also described and introduced. This programmable virtual spectrum analyzers is achieved by software part, LabVIEW - hardware part, DAQ card and some external circuits. The designed measurement functions include five pallettes: (1) spectrum analyzer design and implementation (2) one signal...
This research proposes poleplacement approach to achieve adaptive control design of band-pass digital filters. Digital control concept is deployed in the design scheme for practical computer control use. Frequency transformation is current well known skill to transfer low-pass prototype filter into another desired filter. It is a mathematical methodology to have the passband change. Here, poleplacement...
A new sensitivity factor which is called ZBUS distribution factor (ZBDF) to calculate active and reactive three-phase line flows for distribution automation is proposed in this paper. This method is associated with both the changes of individual phase-active and reactive power injection at each bus into the three-phase real and reactive power line flows. Hence, the proposed ZBDF reflects load changes...
This paper develops an optimal robust control algorithm for finding digital computer control of decentralized stochastic singularly-perturbed large-scale actuator type systems with multiple time varying delays. Due to the derived algorithm concerns at each moment, the found controller is also suitable in the time varying condition. Moreover, this system possesses the fast response characteristics...
An iteration method is proposed for sub-optimal output feedback computer control of decentralized singularly-perturbed systems. Computer control, decentralized output feedback control, and order- reduced control are three primary goals for this control scheme. The analog to digital transformation technique is used to convert continuous-time state models to discrete-time domain for the controllers...
In this research, a single input virtual digital multi-meter are designed and constructed. It consists of three major works: (1) software design of front panel, (2) measurement circuit design and (3) system integration. The related measurement theories are also described and introduced. This digital multi-meter is made by software part, Labview, hardware part, DAQ card and external measurement circuits...
This article is aimed at a case study of a vocational high school in central Taiwan, proposing various energy conservation strategies, as well as promoting 16 optimal plans for energy conservation over a 3-year period of monitoring and recording. This study is based on the statistics regarding energy conservation, and the subject has been designated by the Ministry of Education as a demonstration...
The paper proposes a direct torque control (DTC) scheme for a matrix-converter-fed induction motor drive system. DTC is a high performance motor control scheme with fast torque and flux responses. However, the main disadvantage of conventional DTC is electromagnetic torque ripple. Besides, the matrix converter is a single-stage ac-ac power conversion device without dc-link energy storage elements...
In this research, the structure and design of virtual impedance analyzers are studied. The construction process is also described and introduced. This programmable virtual impedance analyzer is achieved by software part, Labview, hardware part, DAQ card and some external circuits. The measurement functions include: (1) impedance [Z] display that has magnitude, phase, impedance and reactance, (2) display...
This is an extension research of [1]. In [1], frequency scaling of adaptive digital filter design algorithm is proposed. The pole placement technique is used to achieve the frequency scaling of adaptive digital filter design. In this paper, the same concept is applied for a fast way to design adaptive high-pass filters. Frequency transformation is used to transfer low-pass prototype filter into high-pass...
This research proposes using poleplacement technique to achieve adaptive filter design. Digital control concept is also deployed in the design scheme for practical computer control use. Frequency scaling is current well known skill to scale low-pass prototype filter into another low-pass filter. It is a mathematical methodology to have the passband change. Here, poleplacement approach is used to shift...
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