Solar DC powered commercial buildings
16 Jun 2013-pp 1500-1505
TL;DR: In this article, the design and development approach that would make a difference is presented, and the design of a solar-PV system for commercial spaces, domestic sector and agriculture sector.
Abstract: Commercial Spaces, domestic sector and agriculture sector constitute major part of electricity usage in India today and has been growing rapidly. Rolling `power-cuts' have become all too common in rural and urban India, forcing many commercial consumers and households to invest in expensive back-up power sources (diesel generators and/or battery-UPS systems). Utilization of solar-PV in a decentralized manner has the potential of addressing these sectors to a significant extent and help in overcoming India's electricity shortage. The decentralized energy generation and usage however poses new challenges and huge. The paper addresses these issues and presents the design and development approach that would make a difference.
07 Jun 2015
TL;DR: In this paper, a load management innovation to provide a limited but uninterrupted DC power supply to homes in India is presented, which enables addition of solar power directly to the DC power line and use of battery, without any converter.
Abstract: This paper presents a load-management innovation to provide a limited but uninterrupted DC power supply to homes in India. In a typically power deficient situation, load shedding becomes unavoidable. The duration and areas where load is shed are typically cycled. In worst situation, power outages last for a greater part of the day. To enable every home to get at least a limited amount of power 24×7, an innovative approach that combines use of DC power and load management has been proposed and implemented in several hundred homes in various locations. In order to make best use of limited power, a DC power line and energy efficient DC appliances are introduced and installed at homes. The approach also enables addition of solar power directly to the DC power line and use of battery, without any converter; the power-limit on DC line can thus be overcome. The paper describes the rationale, implementation and user feedback of the approach. Further improvements and plan for future are indicated.
Cites background from "Solar DC powered commercial buildin..."
...Cost of cycling the power through the battery is high ....
TL;DR: In this paper , the authors developed a methodology for analysing Net Zero Energy (NZE) implementation using Low Voltage DC (LVDC) guidelines specified by “IS 16711: 2017”.
Abstract: Renewable energy sources, such as solar, wind are either intrinsically DC or converted to DC for all general applications. As a result, before linking with a typical AC grid, a DC to AC conversion stage is necessary, which reduces the efficiency of the system. Presently, many loads are intrinsically DC loads, hence there is a further conversion from AC to DC is needed before utilization. Due to the intermittency of renewable energy, a storage system, typically a battery for building applications which is again a DC load/source, is needed for stable operation. If a DC distribution system is used between these sources, load, and storage, the repeated DC/AC and AC/DC conversions can be minimised, enhancing the system efficiency. Since these components in the present study are located inside a building, the Low Voltage DC (LVDC) guidelines specified by “IS 16711: 2017” are considered. The primary goal of this study is to develop a methodology for analysing Net Zero Energy (NZE) implementation using LVDC. This includes the location-specific and building-specific details. The procedure provided in this research provides the framework for solar-powered DC Nanogrid designers to predict the optimum battery size and solar PV size, to attain NZE with the better Net Present Value (NPV) and maximum battery life. This approach has been adopted for optimising the parameters for a typical residential and a commercial building located in a tropical monsoon climatic region. The results clearly demonstrate the benefits of connecting a solar PV source to a commercial building with a higher daytime load than a residential building with a peak load during non-sunshine hours.
TL;DR: The deficit in the supply of electricity relative to demand at peak hours in 2011-12 was 11 per cent as mentioned in this paper, while generation capacity has increased, the fuel supply situation has deteriorated.
Abstract: The deficit in the supply of electricity relative to demand at peak hours in 2011-12 was 11 per cent. While generation capacity has increased, the fuel supply situation has deteriorated. Here, some factors affecting the power supply situation are presented. [PRS]. URL:[http://www.prsindia.org/parliamenttrack/vital-stats/some-data-on-power-supply-2406/].
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