Textbook of Gynecology for Nurses

Tamrakar, Anupama

doi:10.5005/jp/books/12374

Cited by 3 publications

(4 citation statements)

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“…The inverse distance weighted method is influenced most by the nearest model and less by the more distant models. The total sum of the weights is equal to one (13). Weights are calculated using (14) where h i is the distance from the scheduled model to the weighting LTI model and h j is the distance from the scheduled model to the nearest n m LTI models.…”

Section: Interpolation Of Grid Pointsmentioning

confidence: 99%

“…Frequency stability with declining system inertia can be maintained with the use of fast frequency support from renewable energy sources to slow the rate of change of frequency (RoCoF) and limit the frequency zenith/nadir during frequency transients [8]. In such scenarios with high penetration levels of renewable energy, various frequency support techniques can be implemented from wind turbines, energy storage systems (ESS) and PVs [7,[9][10][11][12][13]. A typical PV system has no rotational inertia and minimal energy storage.…”

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confidence: 99%

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An Enhanced Two-Stage Grid-Connected Linear Parameter Varying Photovoltaic System Model for Frequency Support Strategy Evaluation

et al. 2019

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Securing a future sustainable decarbonised economy involves moving towards a system with rising penetration levels of distributed photovoltaics (PVs) within the low voltage distribution network (LVDN). This power system evolution is displacing conventional generators and has resulted in a decline in inertia that is essential for frequency stability. Emerging network codes require PV generators to maintain a scheduled curtailed active power (CAP) reserve for under-frequency contingencies. In this paper, the development, verification and application of an enhanced, two-stage grid-connected, state-space, linear parameter varying (LPV) PV system model is presented. The LPV model provides accurate and efficient modelling for PV systems over the wide range of operating points associated with curtailed active power and is suitable for power systems with large numbers of distributed PV systems capable of frequency support in the LVDN, to be simulated within reasonable simulation times. In addition, the LPV model can be used to investigate voltage rise due to reverse active power. The model performance is evaluated using recorded experimental data with step changes in irradiation and active power curtailment. The measured data is generated from a power hardware in the loop (PHIL) testbed. The model's performance is investigated on an adapted radial European LVDN benchmark with several distributed PV systems to present some of the challenges, opportunities and benefits.Step changes in solar irradiation are used to evaluate the dynamic behaviour of the LPV model compared to a discrete-time electromagnetic transient (EMT) model. A frequency droop control characteristic for frequency support is demonstrated. The results show a computational burden reduction of 132:1 compared to the EMT model and demonstrate the voltage rise due to reverse active power from providing frequency support during under-frequency contingencies.Keywords: linear parameter varying (LPV); photovoltaic (PV) system; state-space; curtailed active power; low voltage distribution network (LVDN); power hardware in the loop (PHIL)Energies 2019, 12, 4739 2 of 26 the displacement of conventional synchronous generators that exhibit high inertia. As inertia decreases frequency stability also decreases, making the system response less robust to a disturbance [5].With increased penetration of these renewable energy sources, they are very diverse and capable of providing grid support functionality needed to handle these challenges for frequency stability [4]. In order to allow maximum renewable generation in theory, it will be desirable for all renewable energy systems to provide grid support functionality. New controls incentivised by policy systems will be needed to maintain frequency stability [6,7].Currently, PV systems operate at maximum power point (MPP) producing the maximum power available from the PV array using a maximum power point tracker (MPPT) controller. Frequency stability with declining system inertia can be maintained with the use of fast frequency ...

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Section: Interpolation Of Grid Pointsmentioning

confidence: 99%

mentioning

confidence: 99%

An Enhanced Two-Stage Grid-Connected Linear Parameter Varying Photovoltaic System Model for Frequency Support Strategy Evaluation

et al. 2019

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“…fainting, premenstrual symptoms such as tender breasts and swollen abdomen, which may continue throughout the period. For most women pain usually starts shortly before or during their menstrual period, peak after 24 hours, and subsides after 2-3 days 3 .The factors like nulliparity, obesity, cigarette smoking and positive family history, stress, family history of dysmenorrhea, diet, depression, and abuse are highly associated with the prevalence of primary dysmenorrhea. 3,4 Even though primary dysmenorrhoea does not have serious complications but it affects the quality of life of adolescent girls.…”

Section: Introductionmentioning

confidence: 99%

“…For most women pain usually starts shortly before or during their menstrual period, peak after 24 hours, and subsides after 2-3 days 3 .The factors like nulliparity, obesity, cigarette smoking and positive family history, stress, family history of dysmenorrhea, diet, depression, and abuse are highly associated with the prevalence of primary dysmenorrhea. 3,4 Even though primary dysmenorrhoea does not have serious complications but it affects the quality of life of adolescent girls. About ten percent of women who have this type of dysmenorrhoea cannot work, attend school, or participate in their normal daily activities which can further lead to poor academic result.…”

Section: Introductionmentioning

confidence: 99%

Prevalence of Dysmenorrhea and Determinants of Menstrual Distress in Adolescent Girls with Dysmenorrhoea, In Tirupati Town

Deekala

Akkapeddi

Rosivari

2022

Natl J Community Med

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Background: Dysmenorrhoea is a common problem during menses in adolescent girls which affects their quality of life, academic activities, cannot attend social functions and use over the counter medicines which may lead to dangerous adverse effects and infertility. Objectives: 1. To study the prevalence of dysmenorrhea in adolescent girls studying in government municipal high schools of Tirupati. 2.To determine the significant factors related to menstrual distress in adolescent girls. Methodology: A cross-sectional study conducted among 320 adolescent girls studying in the selected government high schools of Tirupati, India. The study investigated symptoms, related factors and consequences of menstrual distress in adolescent girls with dysmenorrhea. Four instruments were used to collect data: Questionnaires on Demographic Data, Menstrual Distress Questionnaire, A Questionnaire related to Menstrual characters and A Short Form McGill Pin Questionnaire. Results: Prevalence of dysmenorrhoea among adolescent girls was found 67.7%. Regression analysis indicated that the best subset for predicting menstrual distress in adolescent girls included MPQ-SF, menstrual cycle in days, socioeconomic status and education. Conclusions: Majority (67.7%) of the adolescent girls were suffering with dysmenorrhoea. Menstrual distress is significantly correlated with impact on daily activities, absence from class, and analgesic usage.

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Knowledge regarding premenstrual syndrome among adolescent school girls in a view to develop an information booklet

Revankar,

Pujari

2023

Indian J Health Sci Biomed Res

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Textbook of Gynecology for Nurses

Cited by 3 publications

References 0 publications

An Enhanced Two-Stage Grid-Connected Linear Parameter Varying Photovoltaic System Model for Frequency Support Strategy Evaluation

An Enhanced Two-Stage Grid-Connected Linear Parameter Varying Photovoltaic System Model for Frequency Support Strategy Evaluation

Prevalence of Dysmenorrhea and Determinants of Menstrual Distress in Adolescent Girls with Dysmenorrhoea, In Tirupati Town

Knowledge regarding premenstrual syndrome among adolescent school girls in a view to develop an information booklet

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