EFFECT OF STATIC VAR COMPENSATOR ON VOLTAGE STABILITY UNDER NETWORK CONTINGENCIES

This paper focuses on enhancement of system performance under network contingencies through an optimal placement and optimal setting of static var compensator (SVC). The goal of the methodology developed is to identify the weakest bus using an index called Line Flow Index (LFI) and to maintain the voltages at all load buses within their specified limits through an optimal placement and optimal setting of SVC under contingency Condition. This premise is attested on 6- bus and 30 bus systems and the simulation results are presented to show the effectiveness of the method

EFFECT OF UPFC ON SYSTEM PERFORMANCE UNDER NORMAL AND FAULT CONDITION

This paper deals with the effect of Unified Power Flow Controller (UPFC) on the system performance under normal and fault conditions. Simulink models are developed for 7 bus system with and without UPFC. Digital simulation using MATLAB/SIMULINK is done with these models and the results are presented. The effect of UPFC on real power, reactive power and the voltage is also presented

Impact of informal groundwater markets on efficiency of irrigated farms in India: a bootstrap data envelopment analysis approach

In recent years, the proliferation of private well irrigation systems in South Asia, especially in the hard rock areas of India, has stimulated the growth of informal groundwater markets. These markets allow water-buying farmers, who are unable to invest in wells, to benefit from irrigation while enhancing the economic benefits of water-selling farmers. In this way, they have a positive impact on farm income. On the other hand, they are believed to have contributed to the problem of overexploitation of groundwater aquifers. This study examines the role of groundwater markets in determining the efficiency of irrigated farms. Technical, allocative and economic efficiency of groundwater-irrigated farms is determined, using a bootstrapped data envelopment analysis, and the determinants of the efficiency are explored using a bootstrapped truncated regression. For this purpose, data were collected from three different groups of groundwater-irrigated farmers: (i) a control group of 30 farmers who are neither selling nor buying groundwater; (ii) a group of 30 water-selling farmers; and (iii) a group of 30 water-buying farmers. The results demonstrate that there is substantial technical, allocative and economic inefficiency in the irrigated production due to overuse of inputs and that this inefficiency is higher among the control group farmers followed by water sellers and water buyers. Also in the second-stage regression, participation in the water markets is revealed as an important factor positively affecting efficiency scores. This shows that it is relevant for the government to make appropriate institutional policy interventions to capitalize on the benefits associated with the water markets, while at the same time, ensuring that the negative external effects are avoided

Population-level risks of alcohol consumption by amount, geography, age, sex, and year: a systematic analysis for the Global Burden of Disease Study 2020

Background: The health risks associated with moderate alcohol consumption continue to be debated. Small amounts of alcohol might lower the risk of some health outcomes but increase the risk of others, suggesting that the overall risk depends, in part, on background disease rates, which vary by region, age, sex, and year. Methods: For this analysis, we constructed burden-weighted dose–response relative risk curves across 22 health outcomes to estimate the theoretical minimum risk exposure level (TMREL) and non-drinker equivalence (NDE), the consumption level at which the health risk is equivalent to that of a non-drinker, using disease rates from the Global Burden of Diseases, Injuries, and Risk Factors Study (GBD) 2020 for 21 regions, including 204 countries and territories, by 5-year age group, sex, and year for individuals aged 15–95 years and older from 1990 to 2020. Based on the NDE, we quantified the population consuming harmful amounts of alcohol. Findings: The burden-weighted relative risk curves for alcohol use varied by region and age. Among individuals aged 15–39 years in 2020, the TMREL varied between 0 (95% uncertainty interval 0–0) and 0·603 (0·400–1·00) standard drinks per day, and the NDE varied between 0·002 (0–0) and 1·75 (0·698–4·30) standard drinks per day. Among individuals aged 40 years and older, the burden-weighted relative risk curve was J-shaped for all regions, with a 2020 TMREL that ranged from 0·114 (0–0·403) to 1·87 (0·500–3·30) standard drinks per day and an NDE that ranged between 0·193 (0–0·900) and 6·94 (3·40–8·30) standard drinks per day. Among individuals consuming harmful amounts of alcohol in 2020, 59·1% (54·3–65·4) were aged 15–39 years and 76·9% (73·0–81·3) were male. Interpretation: There is strong evidence to support recommendations on alcohol consumption varying by age and location. Stronger interventions, particularly those tailored towards younger individuals, are needed to reduce the substantial global health loss attributable to alcohol. Funding: Bill & Melinda Gates Foundation