Journal Article•
Solar-DC:India towards Energy Independence
TL;DR: In this article, a vision of having 50% of electrical power from renewable technologies by 2030 is being put forward, but the focus is primarily on centralized power generation from solar photovoltaics (PV).
Abstract: Over the last few years, India has focused considerably on solar power. A vision of having 50% of electrical power from renewable technologies by 2030 is being put forward. But the focus is primarily on centralized power generation from solar photovoltaics (PV). There is talk about decentralized rooftop solar PV deployments. However, they are all subsidy-driven and so far have failed to make significant inroads into homes. To understand the reasons, let us take up a tangential issue first.
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01 Dec 2017
TL;DR: In this paper, a demand-side management (DSM) scheme for the autonomous DC microgrid for the future building is proposed, which shifts the deferrable load from non-sunny hours to sunny hours.
Abstract: This paper proposes a new demand-side management (DSM) scheme for the autonomous DC microgrid for the future building. The DC distribution system is considered as a prospective system due to the increase of DC loads and DC power sources such as photovoltaic (PV), and battery bank (BB). The BB responds to the changes in a power imbalance between PV generation and demand within an autonomous DC microgrid. The power loss during charging/discharging of the battery is the great challenge for the autonomous DC microgrid supplied by PV. It decreases the system efficiency. The control objective of the proposed DSM scheme is to use the PV energy more efficiently. The proposed control algorithm shifts the deferrable load from non-sunny hours to sunny hours and decreases the building demand during non-sunny hours. In this way it decreases the charging/discharging cycles of the batteries. This is reducing the power losses in the battery and improves system efficiency. The proposed scheme reduces the size of the PV plant, storage and capital cost of the system. The results showing a clear shifting of the load so that to get significant reduction in the system cost which is given numerically as percentatge saving.
32 citations
01 Jan 2020
TL;DR: The result shows that the proposed DSM scheme significantly increases the direct use of PV energy and decreases the use of battery energy.
Abstract: This chapter proposes a demand-side management (DSM) scheme for the autonomous microgrid for the residential building. The direct current (DC) distribution system is considered a prospective system due to the increase of DC loads and DC power sources, such as photovoltaic (PV) and battery bank (BB). The BB responds to the changes in a power imbalance between PV generation and demand within the autonomous microgrid. The power loss in the battery during charging/discharging is a great challenge for the PV system autonomous microgrids. It decreases the system efficiency. The control objective of the proposed DSM scheme is to use the PV energy more efficiently and minimize the use of battery energy (charging and discharging cycles). The proposed control algorithm shifts the deferrable load from nonsunny to sunny hours to decrease the building demand during nonsunny hours. The result shows that the proposed DSM scheme significantly increases the direct use of PV energy and decreases the use of battery energy. The proposed scheme decreased the power loss in the battery and improved system efficiency. The size of the PV plant, energy storage, and capital cost of the system with DSM scheme have been reduced.
7 citations
13 Mar 2018
TL;DR: A safe and power efficient AC-DC hybrid solution is proposed for fulfilling the basic needs of uninterrupted power and integration of renewable energy for essential functions of homes in rural as well as urban scenarios.
Abstract: There is a compelling need to reduce carbon footprints. With the pollution bringing the capital of India to a standstill in November 2017, this is being emphatically reiterated. This paper aims to investigate the use of DC in homes and also the use of solar energy to reduce electricity demand drastically. Renewable energy in homes comes from solar panels in its DC form. Similarly, most of the electronic gadgets used in homes today consume DC. Brush Less DC (BLDC) motors and inverter technology have enabled other appliances to operate on DC. Mainly due to unavailability of power and inefficiency of power distribution, ‘24×7’ uninterrupted electricity remains a dream even for most of the urban population today. Rural scenario is still worse. To remain powered during outages, most houses store energy in DC batteries, which is again inefficiently converted to AC by inverters. Because of these compelling reasons, DC power replacing AC in homes is gaining momentum. Some projects are also in progress. Focus of this paper is to answer the pertinent questions; what are the main drivers of DC power in homes and how this initiative could be supported by working on Indian standards and promoting an eco-system of DC appliances. Based on experiments and quantitative analysis, a safe and power efficient AC-DC hybrid solution is proposed for fulfilling the basic needs of uninterrupted power and integration of renewable energy for essential functions of homes in rural as well as urban scenarios.
7 citations
Cites background from "Solar-DC:India towards Energy Indep..."
...This paper studies the trends in this area, covering the case studies of remote villages in Rajasthan and Bihar [2]....
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01 Dec 2016
TL;DR: In this article, a commercial multi-storied buildings are designed for them to respond to the grid availability without affecting the working and life-style of people in the building to a significant extent.
Abstract: As India tries to add significant renewables to its coal-dominated energy mix, the problem of intermittent generation associated with renewables, is likely to be a problem Even though battery prices have been falling rapidly, any serious grid-level storage will push up the price of electricity beyond the affordability limit for a large section of Indian people The answer is in developing techniques, practices and policies, which enables the consumers to carry out load-management in response to grid-power availability If grid-power is surplus, the customer uses grid to the maximal extent, but when grid-power is in deficit, it uses it to minimal extent This paper focuses on commercial multi-storied buildings and discusses how power-systems can be designed for them to respond to the grid-availability without affecting the working and life-style of people in the building to a significant extent It proposes use of roof-top solar and DC power-line within buildings along with DC-powered appliances to significantly save energy It incorporates battery-storage and chilled-water storage, which coupled with use of DC motors or variable frequency drives, can help building cut its load to almost 50% or even less during grid-power shortage and draw power more than its load during surplus situation The paper goes beyond the concept and discusses actual implementation being carried out today It also discusses policies which will accelerate deployment of such designs benefiting both the customer as well as the grid-supply
1 citations
Cites background from "Solar-DC:India towards Energy Indep..."
...The availability to vary electrical loads based on power-availability is referred to as demand-dispatch [4]....
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26 Oct 2022
Abstract: This paper presents a energy management system (EMS) for a photovoltaic-fuel DC generator based microgrid system for home. The proposed system is based on the following objectives: (i) To Ensure Load sharing among sources. (ii) To reduce the power loss and increase efficiency of the photovoltaic system with the implementation of MPPT Algorithm. (iii) To make the system economically viable by using DC Generator as a backup instead of designing a specific battery bank. To improve the system's reliability and power quality, a proportional-integral (PI)-based controller is designed to operate a DC generator as a backup to maintain microgrid stability when there is a power shortage at the DC bus bar due to low PV power generation or excess load. The DC generator then begins to supply the load. The performance and control strategy of proposed EMS is verified using MATLAB Simulink.
1 citations