scholarly journals Imbalance Fault Detection Based on the Integrated Analysis Strategy for Marine Current Turbines under Variable Current Speed

Entropy ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. 1069 ◽  
Author(s):  
Tao Xie ◽  
Tianzhen Wang ◽  
Demba Diallo ◽  
Hubert Razik
Keyword(s):  
Synchronous Generator ◽  
Current Speed ◽  
Integrated Analysis ◽  
Test Bed ◽  
Marine Current Turbine ◽  
Fault Severity ◽  
Fault Indicator ◽  
Analysis Strategy ◽  
Marine Current ◽  
Variation Rate

The conversion of marine current energy into electricity with marine current turbines (MCTs) promises renewable energy. However, the reliability and power quality of marine current turbines are degraded due to marine biological attachments on the blades. To benefit from all the information embedded in the three phases, we created a fault feature that was the derivative of the current vector modulus in a Concordia reference frame. Moreover, because of the varying marine current speed, fault features were non-stationary. A transformation based on new adaptive proportional sampling frequency (APSF) transformed them into stationary ones. The fault indicator was derived from the amplitude of the shaft rotating frequency, which was itself derived from its power spectrum. The method was validated with data collected from a test bed composed of a marine current turbine coupled to a 230 W permanent magnet synchronous generator. The results showed the efficiency of the method to detect an introduced imbalance fault with an additional mass of 80–220 g attached to blades. In comparison to methods that use a single piece of electrical information (phase current or voltage), the fault indicator based on the three currents was found to be, on average, 2.2 times greater. The results also showed that the fault indicator increased monotonically with the fault severity, with a 1.8 times-higher variation rate, as well as that the method is robust for the flow current speed that varies from 0.95 to 1.3 m/s.

scholarly journals POTENSI ARUS LAUT DAN KONVERSI DAYA LISTRIK SEBAGAI ENERGI BARU TERBARUKAN DI PERAIRAN PALALAWAN DAN INDRAGIRI HILIR, PROVINSI RIAU

2016 ◽  
Vol 10 (2) ◽  
pp. 69
Author(s):  
Beben Rachmat ◽  
Ediar Usman ◽  
Dida Kusnida
Keyword(s):  
Neap Tide ◽  
Electrical Potential ◽  
Current Speed ◽  
Survey Area ◽  
Effective Time ◽  
The North ◽  
Submarine Channel ◽  
Marine Current Turbine ◽  
Marine Current ◽  
The Difference

Kecepatan arus pada saat kondisi air surut di bagian utara daerah penelitian berkisar antara 1 – 1,5 m/s dan di selatan berkisar antara 0,1 – 0,5 m/s dengan arah menuju tenggara - selatan. Pada saat kondisi air pasang pada kedua daerah tersebut (bagian utara dan selatan) kecepatan arus berkisar antara 0,5 – 1,2 m/s dengan arah menuju barat daya - utara. Secara umum kecepatan arus dari utara ke selatan semakin berkurang kecepatannya, hal ini bisa dilihat dari perbedaan kecepatan arus di bagian utara dan selatan daerah penelitian pada kondisi air laut surut. Kondisi tersebut disebabkan oleh perbedaan morfologi bawah laut pada ke dua daerah tersebut. Di bagian utara, lebar lembah relatif lebih sempit (daerah selat) dengan morfologi membentuk alur bawah laut. Di bagian selatan merupakan daerah perairan terbuka, menyebabkan aliran air laut dan arus terdistribusi pada daerah yang lebih luas dan kecepatan arusnya makin berkurang. Potensi daya listrik untuk Turbin Kobold saat surut mencapai 60 – 65 kW, dan 20 kW saat pasang selama 13 jam, sedangkan saat neap tide maksimum mencapai 8 kW saat surut dan 4 kW saat pasang dengan waktu efektif selama 11 jam. Potensi daya listrik untuk Turbin Marine Current saat surut mencapai 3 – 3,2 kW dan 1 kW saat pasang dengan masa kerja selama 13 jam dalam sehari semalam, sedangkan saat neap tide maksimum mencapai 0,4 kW saat surut dan 0.2 kW saat pasang dengan waktu efektif selama 10 jam. Jenis turbin ini cukup optimal dan dapat bekerja dengan baik untuk menghasilkan listrik dengan potensi arus yang ada di perairan Pelalawan – Indragiri Hilir. Kata kunci: kecepatan arus, energi, potensi daya listrik, turbin Current speed during the low waters level in the northern part of survey area range between 1 to 1.5 m/s with southeast and south direction. During the high waters level (HWL) in the both areas range from 0.1 – 0.5 m/s with southwest and north direction. Generally, the current speed from the north to the south in the survey area is decrease, it can be seen from difference value of current speed at the northern and the southern of the survey area during the low waters level (LWS) condition. These condition caused by the difference of under sea morphology at bothside of areas. At the northern part of survey area, the wide of valley morphology is smaller (straits region) forming the submarine channel. At the southern part in an opening waters region, causing the sea current distributed in regions and the speed more decreasing. Electrical potency for Kobold Turbine during ebb tide reach 60 - 65 kW, and 20 kW during the flood as long as 13 hours, while during maximum neap tide reach 8 kW during the ebb and 4 kW during the flood with effective time as long as 11 hours. Electrical Potential for Marine Current Turbine during ebb reach 3 – 3.2 kW, and 1 kW during the flood as long as 13 hours, while during maximum neap tide reach 0.4 kW during the ebb and 0.2 kW during the flood with effective time as long as 10 hours. This kind of the turbine is optimum enough and can work well to produce the electricity with existing current potential in waters of Pelalawan – Indragiri Hilir. Keywords: current speed, energy, electrical potency, turbine

scholarly journals Power Control of a Nonpitchable PMSG-Based Marine Current Turbine at Overrated Current Speed With Flux-Weakening Strategy

2015 ◽  
Vol 40 (3) ◽  
pp. 536-545 ◽  
Author(s):  
Zhibin Zhou ◽  
Franck Scuiller ◽  
Jean Frederic Charpentier ◽  
Mohamed El Hachemi Benbouzid ◽  
Tianhao Tang
Keyword(s):  
Power Control ◽  
Current Speed ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Current Turbine ◽  
Flux Weakening

scholarly journals A Synchronous Sampling Based Harmonic Analysis Strategy for Marine Current Turbine Monitoring System under Strong Interference Conditions

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2117 ◽  
Author(s):  
Milu Zhang ◽  
Tianzhen Wang ◽  
Tianhao Tang ◽  
Zhuo Liu ◽  
Christophe Claramunt
Keyword(s):  
Fault Detection ◽  
Harmonic Analysis ◽  
Band Pass Filter ◽  
Zero Crossing ◽  
Strong Interference ◽  
Marine Current Turbine ◽  
Fault Features ◽  
Analysis Strategy ◽  
Marine Current ◽  
Current Turbine

Affected by high density, non-uniform, and unstructured seawater environment, fault detection of Marine Current Turbine (MCT) faces various fault features and strong interferences. To solve these problems, a harmonic analysis strategy based on zero-crossing estimation and Empirical Mode Decomposition (EMD) filter banks is proposed. First, the detection problems of rotor imbalance fault under strong interference conditions are described through an analysis of the fault mechanism and operation environment of MCT. Therefore, against various fault features, a zero-crossing estimation is proposed to calculate instantaneous frequency. Last, and in order to solve the problem that the frequency and amplitude of the operating parameters are partially or completely covered by interference, a band-pass filter based on EMD is used, together with a characteristic frequency selected by a Pearson correlation coefficient. This strategy can accurately detect the multiplicative faults under strong interference conditions, and can be applied to the MCT fault detection system. Theoretical and experimental results verify the effectiveness of the proposed strategy.

Design optimization of a marine current turbine having winglet on blade

2021 ◽  
Vol 239 ◽  
pp. 109877
Author(s):  
Murali Kunasekaran ◽  
Shin Hyung Rhee ◽  
Nithya Venkatesan ◽  
Abdus Samad
Keyword(s):  
Design Optimization ◽  
Marine Current Turbine ◽  
Marine Current ◽  
Current Turbine

Towards a Data Calibrated, Simulation-Based Campus Energy Analysis Environment for Situational Awareness and Future Energy System Planning

2014 ◽  
Author(s):  
Scott Duncan ◽  
Michael Balchanos ◽  
Woongje Sung ◽  
Juhyun Kim ◽  
Yongchang Li ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Visual Analytics ◽  
Distribution Systems ◽  
Situational Awareness ◽  
Energy System ◽  
Integrated Analysis ◽  
Test Bed ◽  
Energy Metering ◽  
Campus Energy ◽  
Analysis Environment

Researchers at Georgia Tech (GT) have recently begun the GT Smart Energy Campus initiative, which combines campus energy metering data with physics-based modeling and simulation to create an integrated analysis environment for campus energy. The environment consists of a digital representation of campus, which supports situational awareness, as well as a virtual test bed for analyzing emerging energy technologies and future scenarios. The first year of the initiative has focused on evaluating campus energy metering data using visual analytics and statistical analysis techniques. Data analysis is presented as having value for two main uses: (1) as attention-directing information to help system operators diagnose anomalies and (2) as a precursor to modeling and simulation (M&S) in future phases of the Smart Energy Campus initiative. The environment is explained using the initial study scoping of the campus thermal energy generation and distribution systems. Furthermore, a modeling and simulation approach leveraging the Modelica M&S language is described, and preliminary results in using it to represent the campus chilled water system are presented.

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