• Title/Summary/Keyword: Power Characteristic Variation Simulation

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Low-Power Fully Digital Voltage Sensor using 32-nm FinFETs

  • Nguyen, H.V.;Kim, Youngmin
    • IEIE Transactions on Smart Processing and Computing
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    • v.5 no.1
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    • pp.10-16
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    • 2016
  • In this paper, a design for a fully digital voltage sensor using a 32-nm fin-type field-effect transistor (FinFET) is presented. A new characteristic of the double gate p-type FinFET (p-FinFET) is examined and proven appropriate for sensing voltage variations. On the basis of this characteristic, a novel technique for designing low-power voltage-to-time converters is presented. Then, we develop a digital voltage sensor with a voltage range of 0.7 to 1.1V at a 50-mV resolution. The performance of the proposed sensor is evaluated under a range of voltages and process variations using Simulation Program with Integrated Circuit Emphasis (SPICE) simulations, and the sensor is proven capable of operating under ultra-low power consumption, high linearity, and fairly high-frequency conditions (i.e., 100 MHz).

The Vibration Characteristic Analysis by Mode Variation of Ring Type Ultrasonic Motor (링형 초음파모터의 모드선정에 따른 진동특성 해석)

  • 윤신용;백수현;김현일
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.53 no.5
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    • pp.309-317
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    • 2004
  • This paper suggested the vibration characteristic improvement by variation mode of ring type ultrasonic motor. Design for the piezoelectric ceramic and elastic body of stator were calculated by the finite element method(FEM) that consider the resonance frequency, vibration mode and coupling efficiency etc. Through the result of vibration analysis from 6 order mode to 8 mode, the 7 order mode was gained very an excellent results that it was the coupling efficient, minimum power loss and bending vibration value. Here over 7 order mode, this paper was acquired that an output current for input voltage was very a large increased results. The result of vibration calculation, from thickness 0.5[mm] to 2[mm], knew the fact that the vibration displacement at 0.5[mm] is an high value too. From such result, this paper was manufactured the ultrasonic motor of outer diameter 5O[mm] , inter 22[mm] having the about 43.86[KHz] resonance frequency. We have gated that a simulation result is 42.2[KHz] and an experiment result is 43.86[KHzl The propriety of this paper was established though comparison. investigation of simulation and experiment result.

Continuation-Based Quasi-Steady-State Analysis Incorporating Multiplicative Load Restoration Model (증배형 부하회복 모델을 포함하는 연속법 기반 준정적 해석)

  • Song, Hwa-Chang;Ajjarapu, Venkatanamana
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.2
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    • pp.111-117
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    • 2008
  • This paper presents a new continuation-based quasi-steady-state(CQSS) time-domain simulation algorithm incorporating a multiplicative aggregated load model for power systems. The authors' previous paper introduced a CQSS algorithm, which has the robust convergent characteristic near the singularity point due to the application of a continuation method. The previous CQSS algorithm implemented the load restoration in power systems using the exponent-based load recovery model that is derived from the additive dynamic load model. However, the reformulated exponent-based model causes the inappropriate variation of short-term load characteristics when switching actions occur, during time-domain simulation. This paper depicts how to incorporate a multiplicative load restoration model, which does not have the problem of deforming short-term load characteristics, into the time simulation algorithm, and shows an illustrative example with a 39-bus test system.

Bi-directional DC-DC Converter Design and Control for Fuel Cell System (연료전지 시스템용 양방향 DC-DC컨버터 설계 및 제어)

  • Kim Sung Ho;Jang Han Keun;Jang Su Jin;Won Chung Yuen;Kim yoon ho
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.479-483
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    • 2004
  • Fuel Cell (FC) has slow response characteristic for load variation. During a load step, the inverter cannot pull more power from the fuel cell than is currently available so supplemental power must be provide by some sort of energy storage elements. In this paper, hi-directional do-dc converter for FC generation system is proposed to improve load response characteristic. The hi-directional converter interfaces the low voltage battery to the inverter dc link of FC generation system. The converter is based on a active full bridge in the primary side and on a half bridge in the secondary of a high frequency isolation transformer. The complete operating principles and simulation results in presented.

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Reactive Power Traceable System based Vulnerable Areas Detection for Reactive Power (무효전력 흐름 추적을 이용한 무효전력 취약지역 판단)

  • Choi, YunHyuk;Bae, MoonSung;Lee, Byongjun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.8
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    • pp.1145-1153
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    • 2015
  • The paper analyzes reactive power flow characteristic in power system by reactive power tracing. In addition, virtual buses are inserted in the algorithm to consider losses of transmission lines, and shunt capacitor treated as a reactive power generator. The results of simulation are analyzed by two points of view. The one is load’s point of view and another is generator’s point of view. Classic purpose of the reactive power tracing consists in the reactive power pricing. However, it is significantly used to select vulnerable area about line outage in this paper. To find the vulnerable area, reactive power tracing variations between pre-contingency and post-contingency are calculated at all load buses. In heavily load area, buses which has highest variation become the most vulnerable bus. This method is applied to the IEEE 39-bus system. It is compared with voltage variation result and VQ-margin to verify its effect.

Sensitivity Analysis of The Electronic Ballasts with The LCpCs-type Resonant Tank for The Discharge Lamps (LCpCs 공진 탱크를 이용한 방전등용 전자식 안정기의 감도특성 해석)

  • Park, Chong-yeon;Choe, Hyeon-hui
    • Journal of Industrial Technology
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    • v.28 no.B
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    • pp.123-127
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    • 2008
  • This paper studied the sensitivity characteries of the electronic ballast for the discharge lamps, which implies variation ratio of the output power by the passive element variation. We have derived the equation to represent the lamp power, and obtained the sensitivity characteristic equations. The simulation result shows that the proposed equations are correct and very useful to design the electronic ballast with the LCpCs-type resonant tank.

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Advanced SOGI-FLL Scheme Based on Fuzzy Logic for Single-Phase Grid-Connected Converters

  • Park, Jin-Sang;Nguyen, Thanh Hai;Lee, Dong-Choon
    • Journal of Power Electronics
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    • v.14 no.3
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    • pp.598-607
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    • 2014
  • This paper proposes a frequency-locked loop (FLL) scheme for a single-phase grid-connected converter. A second-order generalized integrator (SOGI) based on fuzzy logic (FL) is applied to this converter to achieve precise phase angle detection. The use of this method enables the compensation of the nonlinear characteristic of the frequency error, which is defined in the SOGI scheme as the variation of the central frequency through the self-tuning gain. With the proposed scheme, the performance of the SOGI-FLL is further improved at the grid disturbances, which results in the stable operation of the grid converter under grid voltage sags or frequency variation. The PSIM simulation and experimental results are shown to verify the effectiveness of the proposed method.

Efficiency Characteristic of PV Inverter with Variable DC-Link (가변 DC-Link 전압 제어를 이용한 태양광 인버터 효율 향상 연구)

  • Kim, Dong-Gyun;Jo, Yeong-Min;Cho, Sang-Yoon;Choy, Ick;Lee, Young-Kwoun;Choi, Ju-Yeop
    • Proceedings of the KIPE Conference
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    • 2015.11a
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    • pp.115-116
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    • 2015
  • Grid voltage variation is usually happened but existing PV inverter dose not consider this variation before inverting into AC power. This inverting is a cause of unnecessary losses. This paper proposes that DC-link should be changed for removing those losses. Furthermore, maximum efficiency tracking control algorithm with variable DC-link voltage is proposed and verified by simulation and experiment.

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Fixed speed wind power generation system modeling and transient state stabilization method using PSCAD/EMTDC (PSCAD/EMTDC를 이용한 고정속 풍력발전시스템 모델링 및 과도상태 안정화기법)

  • Kim, Young-Ju;Park, Dae-Jin;Ali, Mohd Hasan;Park, Min-Won;Yu, In-Keun
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1178-1179
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    • 2008
  • This paper describes a modeling of fixed speed wind power generation system which comprise of wind turbine, generator and grid. The wind turbine is based on MOD-2, which is IEEE standard wind turbine, and includes a component using wind turbine characteristic equation. Fixed speed induction generator is directly connected to grid, so the variation of wind speed has effects on the electrical torque and electrical output power. Therefore the power control mode pitch control system is necessary for aerodynamic control of the blades. But the power control mode does not operate at the fault condition. So it is required some methods to control the rotor speed at transient state for stabilization of wind power system. In this paper, simulation model of a fixed speed wind power generation system based on the PSCAD/EMTDC is presented and implemented under the real weather conditions. Also, a new pitch control system is proposed to stabilize the wind power system at the fault condition. The validity of the stabilization method is demonstrated with the results produced through sets of simulation.

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Characteristic of Linear Inductive Power Transmission According to the load variation (부하 변동에 따른 선형 유도 전력 전달 장치의 특성 해석)

  • 구대현;홍정표;강도현
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.12
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    • pp.595-601
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    • 2003
  • For a control of CPS(Contactless Power Supply), the paper deals with the results which are simulated by a equivalent electric circuit on the LIPT(Linear Inductive Power Transmission). In order to control the CPS, the output values is handled with the driving frequency according to the change of a load. The method that controls the driving frequency for adjusting the output power is reasonable to be applied to the controller. But, when the driving frequency meets the resonant frequency and passes, it lead to a serious problem. Therefore, the controlled region of the driving frequency has to be predicted and determined by the simulation of a electric circuit.