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As for UHF detection of partial discharge, a hardware interface is essential in introducing the electrical signal of discharge into computer for further analysis and identification. Herein, this system is developed in Labview platform of NI Corporation and data acquisition card is connected with computer through USB bus. So the author explored the hardware interface including the data acquisition...
Digital control of a general-purpose switching power supply is one of the key technologies to perform the high reliability and the intelligent function demanded for the next generation. The contribution of this paper is the development of a digital control-based switching power supply. In the developed system, the generation method of the optimal voltage reference in accordance with the output voltage...
This paper uses the grid-connected photovoltaic (PV) power plant electromechanical transient simulation model on FASTEST (Fast Analysis of Stability using the Extended equal area criterion and Simulation Technologies) to do the simulation of PV power plant integrated to the grid. The simulation includes the largest installed capacity of PV power plant and the response of PV power plant when solar...
The main objective of this paper is to address both technical and financial aspects of a solar home system compared to Stirling engine system with our proposed model. The solar dish Stirling engine with solar tracker, tracks the sun ray to provide higher output power at a less cost compared to Solar Home System (SHS). In this paper it is shown that our proposed voltage controller provides higher efficiency...
This paper presents a voltage sag compensator based on a switched autotransformer by random hysteresis voltage control. The advantage of this compensator is that it uses only one controlled switch per phase with no energy storages. Also the control scheme purposed here distributes the harmonic spectrum of the load voltage and reduces its total harmonic distortion (THD). Different voltage sag events...
This paper presents the relevant aspects related to large scale integration of wind power into the power system. Grid integration of WPPs is a technical and economic ability of WPPs to connect and operate within the electric power supply network in a manner which is compatible with the day-to-day operation and short-term security of the electric supply as a whole. WPPs when connected to a weak grid...
For doubly-fed induction generator-based wind energy conversion systems (DFIG-based WECSs), the output voltage of rotor-side converter (RSC) has to be lower than the de-link voltage due to its buck circuit topology. For this reason, under severe grid faults that cause large electromotive forces in the generator, the short circuit current can not be suppressed effectively. To evaluate the control limit...
SRG is a complex nonlinear dynamic motor. Conventional methods can't build it model accurately; bring the controls a great deal of inconvenience. In this paper, 8/6 switched reluctance generator will be mentioned; Application of Fuzzy Logic Controller (FLC) is studied in this paper to control the DC-link voltage of Switched Reluctance Generator (SRG) wind power generation system. The design of fuzzy...
Firstly this paper presents the technical aspects of designing a Dynamic Voltage Restorer (DVR) to meet some stringent requirements of voltage sags mitigation for Micro Integrated Power System (MIPS). Secondly through an analysis of configuration of DVR the optimum energy injection scheme is introduced. Thirdly the principles of a control scheme and a protection circuit for mitigating surge current...
The control for a switched reluctance generator (SRG) with three-level power converter to increase output power is presented in this paper. First, the operation conditions and key factors to enhance output power of SRG are proposed. Then a three-level power converter with intermediate freewheeling boosts the magnetizing current and the average current in generation freewheeling region. Accordingly,...
With respect to the deficiency of the output modeling, topology modeling and switching function modeling of the STATCOM, this paper states the voltage regulating principle of the STATCOM and analyzes the switch characteristics of the voltage source converter controlled by the SPWM, then deduces the duty ratio of each switches based on the switching function. Then, introduces the switching system concept...
Aiming for the application in petroleum-heating field, an induction wind power generation system with graded capacitors and load is designed. The system is simple, reliable and low cost. Under variable generator speeds, the output voltage variation is controllable by switching the graded capacitors, and the output power is adjusted to guarantee the effective utilization of the wind power. The optimization...
To solve the problems of voltage fluctuation, flicker, harmonic and long distance transmission caused by offshore large scale wind farm (WF), a wind power integration scheme by using VSC-HVDC system has been proposed. The WF's voltage has kept in stable by the VSC-HVDC system's reactive power control in real time. There is little low-order harmonics and voltage fluctuation because the power has transmitted...
This paper analyzes the transition characteristic of the doubly-fed induction generator (DFIG) during the grid fault, and the approximate short current calculation which is based on the fifth-order DFIG model is also introduced to support the analysis. A novel method which is easier and more accurate than the past ones is proposed to verify the low voltage ride through (LVRT) characteristic of the...
Aimed at the fluctuate characteristics of isolated wind power system export voltage and frequency, apply the Space Vector Pulse Width Modulation technology, design the control system of small capacity converter. Build the rectifier and inverter model in Matlab/simulink environment and simulated. The results show that the converter base on the control of SVPWM can dampen the wind power system output...
This article uses ATP-EMTP software platform to analyze the electromagnetic transient process of the reactive power compensation system. Simulation results show that the closing surge of inputing capacitor and the reignition overvoltage are the most serious damage on the system electromagnetic transient process. This article also discussed the renewed measures on the reignition overvoltage and calculated...
Many distribution systems nowadays have significant penetration of distributed generation (DG) and thus, islanding operation of these distribution systems is becoming a viable option for economical and technical reasons. The DG should operate optimally during both grid-connected and islanding mode, which can be achieved with change in operating strategy. This paper summarizes the excited methods already...
Two kinds of different arrangements on harmonic-suppressed winding with LC filters is studied in this paper, based on the principle of CRT with simplex control winding. According to the analysis of Equivalent circuit of three-winding transformer, the effect of harmonic-suppressed is optimum when harmonic-suppressed winding is placed between control winding and work winding.The Simulation model of...
The research of control and protection in Micro grid technology is key to distributed generation(DG), such as wind power, Photovoltaic (PV) power generation, tidal power and so on. Through DC-AC converter or AC-DC-AC converter the renewable energy supply power to the loads, so the power electronics technology has a decisive role in DG and Micro grid technology based on renewable energy. In this paper,...
DC micro-grids is an advanced electric delivery infrastructure candidate for future Smart Grid. By interactively integrating a wide selection of renewable sources, energy storages as well as traditional utility grid within a local power network, DC micro-grids can achieve economical system operation, and bing local survivability to critical zones. As important supplement to conventional generation...
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