• Title, Summary, Keyword: Load measurement

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The study of load measurement on U50 wind turbine (U50 풍력발전기 하중측정 실증연구)

  • Cho, Joo-Suk;Hong, Hyeok-Soo;Bang, Jo-Hyug;Park, Jin-Il;Ryu, Ji-Yune
    • New & Renewable Energy
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    • v.3 no.4
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    • pp.114-122
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    • 2007
  • This paper addresses the measurement of structural loads on the Unison U50 wind turbine. The load measurement are carried out to determine the actual loads acting on a wind turbine. This is needed not only the certification process but also improving the technical development for prototype wind turbine. The measurement system is consists of measuring load, operating quantities and meteorological signal. All data that occur during the operating of a WT are stored the data acquisition system automatically. With using the measured data, load spectrum and equivalent load are evaluated according to IEC61400-13 "Measurement of mechanical loads".

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The study of load measurement on U50 wind turbine (U50 풍력발전기 하중측정 실증연구)

  • Cho, Joo-Suk;Hong, Hyeok-Soo;Bang, Jo-Hyug;Park, Jin-Il;Ryu, Ji-Yune;Gil, Kye-Hwan
    • 한국신재생에너지학회:학술대회논문집
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    • pp.341-344
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    • 2007
  • This paper addresses the measurement of structural loads on the Unison U50 wind turbine. The load measurement are carried out to determine the actual loads acting on a wind turbine. This is needed not only the certification process but also improving the technical development for prototype wind turbine. The measurement system is consists of measuring load, operating quantities and meteorological signal. All data that occur during the operating of a WT are stored the data acquisition system automatically. With using the measured data, load spectrum and equivalent load are evaluated according to IEC61400-13 "Measurement of mechanical loads".

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On-line Static Load Modeling using Measurement Data (측정데이터를 이용한 실시간 정적 부하모델링)

  • Park, Sang-Hyun;Chung, Dong-Hyun;Kang, Sang-Gyun;Lee, Byong-Joon;Kwon, Sae-Hyuk
    • Proceedings of the KIEE Conference
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    • pp.282-284
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    • 2006
  • In this paper, Static load models are developed using measurement based approach which is fundamental for on-line load modeling. The measurement data can be acquired from PMU(phasor measurement units). On the assumption that we have on-line measurement data, a scheme which is for Static load model capable to apply SCADA/EMS is developed. The Least Squares criterion is used for minimizing between measured and simulated data. In this manner, On-line Static load modeling algorithm can be developed. In this paper, a scheme that simple Static load model is applied for On-line load modeling is studied.

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A Development of the Recoil Rod Pull Force Measurement System Using the Load Cell with Sleeve (슬리브관을 갖는 로드셀을 이용한 주퇴봉 당김력 계측시스템 개발)

  • Choi, Ju-Ho;Hong, Sung-Soo;Lyou, Joon
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.2
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    • pp.152-159
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    • 2001
  • This paper presents a development of the recoil rod pull force measurement system suing the load cell with a sleeve normally available in the recoil system test. The commercial load cell cannot be used in the test of recoil system floating the breach contact point freely in the air. The load cell is designed and manufactured to meet the recoil system test condition. Theoretical analysis and experimental results show that the accuracy of the developed measurement system is within $\pm$0.5%. We notice that the measurement technique proposed in this paper is accurate and useful in the recoil rod pull force measurement of the recoil system.

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Development of Vehicle Clutch Discs Cushion Variation Measurement Device Using a Variable Load Electric Press (하중 가변형 전동 프레스를 이용한 차량용 클러치 디스크 쿠션 변위량 측정 장치 개발)

  • Park, Seung-Gyu;Choi, Hae-Woon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.6
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    • pp.64-69
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    • 2016
  • Vehicle clutch measurement for disc cushion variation was developed for the production of high quality Dual clutch transmissions. The developed device is composed of load cells for load measurement and LVDT for measuring the distance variation measurement in cushion variation. The servo motor-driven electric press for flexible loads that was developed was controlled by a PC-based HMI system, LabVIEW, and the device was able to continuously record real time measurement data with the accuracies of ${\pm}0.1\;kgf$ load and ${\pm}5{\mu}m$ cushion amount, which is far above the requirements of commercial vehicle standards.

Measurement-based Estimation of the Composite Load Model Parameters

  • Kim, Byoung-Ho;Kim, Hong-Rae
    • Journal of Electrical Engineering and Technology
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    • v.7 no.6
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    • pp.845-851
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    • 2012
  • Power system loads have a significant impact on a system. Although it is difficult to precisely describe loads in a mathematical model, accurately modeling them is important for a system analysis. The traditional load modeling method is based on the load components of a bus. Recently, the load modeling method based on measurements from a system has been introduced and developed by researchers. The two major components of a load modeling problem are determining the mathematical model for the target system and estimating the parameters of the determined model. We use the composite load model, which has both static and dynamic load characteristics. The ZIP model and the induction motor model are used for the static and dynamic load models, respectively. In this work, we propose the measurement-based parameter estimation method for the composite load model. The test system and related measurements are obtained using transient security assessment tool(TSAT) simulation program and PSS/E. The parameter estimation is then verified using these measurements. Cases are tested and verified using the sample system and its related measurements.

A Study On Measurement-based Load Modeling Using PSCAD/EMTDC (PSCAD/EMTDC를 이용한 측정기반의 부하모델링 연구)

  • Lee, Kyung-Sang;Park, Rae-Jun;Song, Kyung-Bin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.6
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    • pp.1079-1085
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    • 2011
  • To supply electrical power with high quality, the power system must be optimized in many ways such as planning, control and management. In order to optimize the power system, the analysis of the power system is necessary. The elements of the power system require an accurate model to analysis of the power system. The components of the power systems such as generators, transformers and transmission lines have been studied and researched a lot in their modeling and very sophisticated models have been proposed. However, in case of load in-depth studies on the exact model are required. In this paper, measurement-based load modeling method using real-time measured data is proposed in various methods to reflect the characteristics of the load. To prove the validity of the proposed method, PSCAD/EMTDC program is used to configure the power system and measurement data according to the various failures are used to study on load modeling.

Performance Monitoring and Load Analysis of Wind Turbine (풍력발전기의 성능 모니터링 및 하중분석)

  • Bae, Jae-Sung;Kim, Sung-One;Youn, Joung-Eun;Kyung, Nam-Ho
    • 유체기계공업학회:학술대회논문집
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    • pp.385-389
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    • 2004
  • Test facilities for the wind turbine performance monitoring and mechanical load measurements are installed in Vestas 100 kW wind turbine in Wollyong test site, Jeju island. The monitoring system consists of Garrad-Hassan T-MON system, telemetry system for blade load measurement, various sensors such as anemometer, wind vane, strain gauge, power meter, and etc. The experimental procedure for the measurement of wind turbine loads, such as edgewise(lead-lag) bending moment, flapwise bending moment, and tower base bending moment, has been established. Strain gauges are on-site calibrated against load cell prior to monitoring the wind turbine loads. Using the established monitoring system, the wind turbine is remotely monitored. From the measured load data, the load analysis has been performed to obtain the load power spectral density and the fatigue load spectra of the wind turbine.

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A study of measurement of the unknown load impedance using sectioned transmission line (${\lambda}/4$ 전송선로를 이용한 부하단 임피던스 측정방법에 관한 연구)

  • Hwang, Soo-Sul;Hong, Sung-Yong
    • Journal of Satellite, Information and Communications
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    • v.6 no.2
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    • pp.91-96
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    • 2011
  • In this paper, we present measurement method of the unknown load impedance. Load impedance is continuously varied by external environment conditions. This arbitrarily varied load impedance can be calculated using 3-point voltage measurement on ${\lambda}/4$ sectioned transmission line. We derived several numerical formulas from 3-point voltage measurement results and drew load impedance selection algorithm from calculated load impedance results. These numerical formulas and load impedance selection algorithm are verified by ADS simulation. Simulation results showed that arbitrary load impedance can be correctly measured using above mentioned formulas and selection algorithm.

Axial Load Transfer Behavior for Driven Open-ended End bearing Steel Pipe Pile (선단지지된 항타개단강관말뚝의 축하중전이거동)

  • 임태경;정성민;정창규;최용규
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.589-596
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    • 2002
  • In this study, static pile load tests with load transfer measurement were accomplished in the field. Yield pile capacity (or ultimate pile capacity) determined by load-settlement-time relationship was determined and axial load transfer behavior was analyzed. In the test for the four test piles were behaved as end bearing pile but ratios of skin friction to total pile capacity were 27%∼33%.

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