Active damping stabilization for reduced DC-link capacitance photovoltaic water-pumping drives

Background: Despite so many developments, most of the farmers in the rural areas are still dependent on rainwater, rivers or water wells, for irrigation, drinking water etc. The main reason behind such dependency is non-connectivity with the National grid and thus unavailability of electricity. To extract the maximum power from solar photovoltaic (SPV) based system, implementation of Maximum Power Point Tracking (MPPT) is mandatory. PV power is intermittent in nature. Variation in the irradiation level due to partial shading or mismatching phenomena leads to the development of modular DC-DC converters. Methods: A stand-alone Multi-Input Dual-Output (MIDO) DC-DC converter based SPV system, is installed at a farm; surrounded with plants for water pumping with stable flow (not pulsating) along with battery energy storage (BES) for lighting. The proposed work has two main objectives; first to maximize the available PV power under shadowing and mismatching condition in case of series/ parallel connected PV modules and second is to improve the utilization of available PV energy with dual loads connected to it. Implementation of proposed MIDO converter along with BES addresses these objectives. First, MIDO controller ensures the MPPT operation of the SPV system to extract maximum power even under partial shading condition and second, controls the power supplied to the motor-pump system and BES. The proposed system is simulated in MATLAB/ SIMULINK environment. Real-time experimental readings under natural sun irradiance through hardware set-up are also taken under dynamic field conditions to validate the performance. Results and Conclusion: The inherent advantage of individual MPPT of each PV source in MIDO configuration, under varying shadow patterns due to surrounding plants and trees is added to common DC bus and therefore provides a better impact on PV power extraction as compared to conventional PV based water pumping system. Multi-outputs at different supply voltages is another flag of MIDO system. Both these aspects are implemented and working successfully at 92.75% efficiency.

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New CUK–SEPIC converter based photovoltaic power system with hybrid GSA–PSO algorithm employing MPPT for water pumping applications

IET Power Electronics ◽

10.1049/iet-pel.2019.1154 ◽

2020 ◽

Vol 13 (13) ◽

pp. 2824-2830 ◽

Cited By ~ 7

Author(s):

Neeraj Priyadarshi ◽

Mahajan Sagar Bhaskar ◽

Sanjeevikumar Padmanaban ◽

Frede Blaabjerg ◽

Farooque Azam

Keyword(s):

Power System ◽

Pso Algorithm ◽

Water Pumping ◽

Photovoltaic Power

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The Development of an Active Damping and Stiffness Technique for Turbomachinery using Shape Memory Alloys

57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference ◽

10.2514/6.2016-0707 ◽

2016 ◽

Cited By ~ 1

Author(s):

Rachel J. Wischt ◽

Nicholas G. Garafolo

Keyword(s):

Shape Memory Alloys ◽

Shape Memory ◽

Active Damping

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The Problem of Carbon Dioxide Emissions from Closed Coal Mine Shafts – The Overview and the Case Study

Archives of Mining Sciences ◽

10.1515/amsc-2016-0042 ◽

2016 ◽

Vol 61 (3) ◽

pp. 587-600

Author(s):

Paweł Wrona ◽

Józef Sułkowski ◽

Zenon Różański ◽

Grzegorz Pach

Keyword(s):

Carbon Dioxide ◽

Carbon Dioxide Emissions ◽

Carbon Dioxide Emission ◽

Mining Area ◽

Emission Point ◽

Water Pumping ◽

Gas Hazard ◽

Flow Through ◽

Reporting Procedures

Abstract Greenhouse gas emissions are a common problem noticed in every mining area just after mine closures. However, there could be a significant local gas hazard for people with continuous (but variable) emission of these gases into the atmosphere. In the Upper Silesia area, there are 24 shafts left for water pumping purposes and gases can flow through them hydraulically. One of them – Gliwice II shaft – was selected for inspection. Carbon dioxide emission with no methane was detected here. Changes in emission and concentration of carbon dioxide around the shaft was the aim of research carried out. It was stated that a selected shaft can create two kinds of gas problems. The first relates to CO2 emission into the atmosphere. Possible emission of that gas during one minute was estimated at 5,11 kg CO2/min. The second problem refers to the local hazard at the surface. The emission was detected within a radius of 8m from the emission point at the level 1m above the ground. These kinds of matters should be subject to regular gas monitoring and reporting procedures.

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