• Title, Summary, Keyword: Power source

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A Study on the Development of Abnormal Power Source Generator to Evaluate Electronic Appliances (시험용 이상전원(異狀電源) 발생장치의 개발에 관한 연구)

  • Park, Chan-Won;Rho, Jea-Kwan
    • Journal of Industrial Technology
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    • v.24 no.A
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    • pp.83-90
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    • 2004
  • Generally, electronic appliances are used on the basis of normal power source supply. The power source inevitably includes the abnormal condition, such as, sudden voltage sagging, power interrupt, and induced noises. As the electronic appliances which include micro-controller-based circuits are being increased recently, the controller circuit sometimes malfunctions by the abnormal condition of the power source. This situation causes serious problems such as hitch of electric appliance, fire and medical instrument glitch, which produces serious situations. In this paper, development of power interrupt tester which is highly suitable for an endurance test device under abnormal power source to microprocessor-based circuits is proposed 89C2051 microcontroller is performed to make power interrupt signal, and software controls peripheral hardwares and built-in functions. Experimental results of this study will offer a good application to electronic appliance maker as a test device of hardware and software debugging use.

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Integrative Control of Series Active Power Filters for Source Voltage Unbalance Compensation and Power Factor Correction (전원 불평형과 역률을 보상하는 직렬형 능동전력필터의 통합적 제어)

  • Jang, Jeong-Ik;Seok, Jul-Ki;Lee, Dong-Choon
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.55 no.5
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    • pp.258-264
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    • 2006
  • This paper presents an integrative control scheme for series-type active power filters combined with shunt passive filters not only to compensate for the source voltage unbalance and current harmonics but also to correct the power factor. To reduce the power capacity of the active filters, passive filters are connected in parallel. Diode rectifiers are replaced by the PWM converters in order to feed the real power back to the source. Power factor control is performed by changing the phase of the load voltage so that the phase of the source current coincides with that of the source voltage. The resultant voltage reference is the addition of the voltage component compensating for the source voltage unbalance and harmonic currents and the voltage component correcting the power factor. The validity of the proposed algorithm has been verified by experimental results.

The Development of a Programmable Single-Phase AC Power Source with a Linear Power Amplifier

  • Jeon, Jeong-Chay;Jeon, Hyun-Jae;Yoo, Jae-Geun;Son, Jae-Hyun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.9
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    • pp.39-46
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    • 2007
  • This paper presents a programmable single-phase ac power source that provides a sinusoidal output voltage with an adjustable output amplitude and frequency over a wide range as well as an arbitrary waveform. The ac power source under consideration have a linear power amplifier. The desired output values can be programmed with a personal computer. The power source operates at 220[V]/60[Hz] mains and the output voltage is isolated from the input circuit. The system consists mainly of a power converter to generate and amplify the waveform signal, a controller to control the desired output signal and measure the output parameters, and a control program to set the desired output and display the values. The prototype ac power source was constructed and tested with the results demonstrating a good performance.

Three-Phase Z-Source Hybrid Active Power Filter System (3상 Z-소스 하이브리드 능동전력필터 시스템)

  • Lim, Young-Cheol;Kim, Jae-Hyun;Jung, Young-Gook
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.1
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    • pp.75-85
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    • 2010
  • In this paper, a Z-source hybrid active power filter is proposed to compensate the harmonics and reactive power in power distribution system. The proposed system is composed of a 7th harmonics-tuned passive filter and an active power filter with a Z-source inverter topology, while voltage source PWM inverter or current source PWM inverter are applied as the power converter topology of conventional active power filters. The Z-source impedance network along with shoot through capability would ensure a constant DC voltage across the DC link. A polymer electrolyte membrane fuel cell is employed as an compensation DC energy source of the proposed system and its equivalent R-L-C circuit is modeled for simulation. As the compensation and control algorithm of the proposed system, the current synchronous detection algorithm is applied. The simulation analysis by PSIM is performed under the three-phase 220V/60Hz voltage source and 25A nonlinear diode loads. The effectiveness of the proposed the system is verified in the steady and transient states.

Influence of Device Parameters Spread on Current Distribution of Paralleled Silicon Carbide MOSFETs

  • Ke, Junji;Zhao, Zhibin;Sun, Peng;Huang, Huazhen;Abuogo, James;Cui, Xiang
    • Journal of Power Electronics
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    • v.19 no.4
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    • pp.1054-1067
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    • 2019
  • This paper systematically investigates the influence of device parameters spread on the current distribution of paralleled silicon carbide (SiC) MOSFETs. First, a variation coefficient is introduced and used as the evaluating norm for the parameters spread. Then a sample of 30 SiC MOSFET devices from the same batch of a well-known company is selected and tested under the same conditions as those on datasheet. It is found that there is big difference among parameters spread. Furthermore, comprehensive theoretical and simulation analyses are carried out to study the sensitivity of the current imbalance to variations of the device parameters. Based on the concept of the control variable method, the influence of each device parameter on the steady-state and transient current distributions of paralleled SiC MOSFETs are verified separately by experiments. Finally, some screening suggestions of devices or chips before parallel-connection are provided in terms of different applications and different driver configurations.

A Kalman Filter based Predictive Direct Power Control Scheme to Mitigate Source Voltage Distortions in PWM Rectifiers

  • Moon, Un-chul;Kim, Soo-eon;Chan, Roh;Kwak, Sangshin
    • Journal of Power Electronics
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    • v.17 no.1
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    • pp.190-199
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    • 2017
  • In this paper, a predictive direct power control (DPC) method based on a Kalman filter is presented for three-phase pulse-width modulation (PWM) rectifiers to improve the performance of rectifiers with source voltages that are distorted with harmonic components. This method can eliminate the most significant harmonic components of the source voltage using a Kalman filter algorithm. In the process of predicting the future real and reactive power to select an optimal voltage vector in the predictive DPC, the proposed method utilizes source voltages filtered by a Kalman filter, which can mitigate the adverse effects of distorted source voltages on control performance. As a result, the quality of the source currents synthesized using the PWM rectifier is improved, and the total harmonic distortion (THD) values are reduced, even under distorted source voltages.

A study of AC/DC combined emergency source for power system control (전력계통 제어를 위한 변전소 AC/DC 겸용 비상전원에 관한 연구)

  • Jun, Bum-Bae;Lee, Hyoung-Han;Kim, Chang-Gon;Ahn, Bo-Soon;Yun, Ki-Seob;Jung, Jong-Ki
    • Proceedings of the KIEE Conference
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    • pp.135-138
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    • 2005
  • This paper focuses on emergency source and control of substation against the consequence of power system breakdown or outage. the aim of the paper is to provide ideas and guidance concerning methods of using AC/DC combined emergency source for power system control to restore power system after unforseen events, such as outages caused by natural disaster. so the emergency source and lamp is very important for restoration control of substation after outage. therefore, this paper proposes countermeasure and method for security of substation emergency source and lamp which is restored at breakdown.

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Study on Energy Consumption of Air-source, Ground-source and Dual-source Heat Pump during Intermediate Season (공기, 지열 및 복합 열원 열펌프의 중간기 에너지 소비량에 관한 연구)

  • Cho, Yeong Uk;Woo, Tea Ho;Chung, Kwang-Seop;Kim, Youngil
    • Transactions of the Korea Society of Geothermal Energy Engineers
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    • v.9 no.4
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    • pp.1-7
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    • 2013
  • This study is to compare energy consumption of air-source, ground-source and dual-source heat pump systems during intermediate season using dynamic simulation. Ground-source heat pump has higher COP than that of air-source but requires additional power consumption of auxiliary equipment such as circulation pump. During intermediate season when the outdoor air temperature is favorable, total COP of air-source heat pump may be greater than that of ground-source when circulation pump power consumption is included. Dual-source heat pump which selects the more favorable heat source is compared with air-source only and ground-source only heat pumps for total power consumption. Results show that power consumption of dual-source heat pump is lower than that of ground-source only by 0.73%.

A Study on Variation of Counterplan in Harmonics Interference Equipment (고초파 장해기기의 저감 대책의 변화에 관한 연구)

  • 성은하;오무송;이은학;김태성
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.414-417
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    • 1999
  • According to development of power electric technology from industrial field to electronic home appliances, recent SMPS using semiconductor is spread widely. Electric converting instrument uses a sine wave voltage source, namely an usual power source, and it gets a non-sines power source from power source because current flows through one part in waveform of one cycle. This injects higher harmonic source in source part, absorb pollution source. And this cause quality deterioration, durability shortage of electric power instrument, spreading accident of electric solver system, and so on. It can't supply an electric source of good quality in industry, so become an impedimental element in improving productivity and reliance. This study can be used in prediction of hindrance and diagnosis material and intends to suggest a countermeasure about measurement data.

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