Real-time voltage stability monitoring model of wind power plant penetration in electrical power system networks

The intermittent output power of wind power plants can affect the stability of the power grid, so a real-time monitoring model is needed. This study uses data from the southern Sulawesi network which is interconnected with wind power plants in real-time, and the IEEE 30 bus data is used as method validation. The method used is the New Voltage Stability Index (NVSI) based on Matlab. The results of the stability index on the IEEE 30 bus data are < 1 or are at the standard of stable criteria, namely 0.95 p.u. The result of the stability index of the South Sulawesi network is line number 49 from Latuppa to Poso has the highest value of 0.0473, the second is line number 18 from Bosowa to Tello is 0.0390, and the third is line number 24 from Tello 30kV to Barawaja is 0.0221, the other bus voltages have lower values. So it can be concluded that the network of South Sulawesi is stable, and intermittent wind power has no effect on voltage stability.

Effects of goal-related statistics on match outcome during the Intercontinental Beach Soccer Cup Dubai 2019

The aim of this study was to investigate the effects of goal-related statistics on match outcome during the Intercontinental Beach Soccer Cup Dubai 2019. The offensive sequences that resulted in goal was analyzed in all 20 matches during the competition (n=138 goals). A set of 35 goal-related statistics were grouped in nine macro-categories: Match-period, Court-zone, Set-play, Open-play, Touches by players before goal, Offensive method, Goalkeeper-line, Number of passes before goal, Ball trajectory. Match outcome in regular time was considered the matches resulting in a loss (n=16), draw (n=8) or win (n=16). The most goals were scored in Open-play (69%), during the 2nd and 3rd periods (36% for each), near to goal (Zone 4; 50%), preceded by 1-touch (67%) and 0-pass (29%), using positional attack (46%), without goalkeeper-line (68%), and with high-ball trajectory (51%). The results of the discriminant function analysis shows the following order of importance to discriminate match outcome, with advantage for winning teams: 4v4 goal-successful (F-Ratio = 12.022), Zone 4, 1-touch, 3rd period, High-ball, Counterattack, Zone 2, Sand-touch (F-Ratio = 4.838). Winning teams scored their goals mainly in open-play situations and without goalkeeper-line, using counterattack to achieve zones near the opponent’s goals, implementing a direct offensive style. Also, goals scored were usually preceded by 1-touch, both through high-ball and sand-touch ball trajectory.

Patterns in Poetry

There are many ways to combine mathematics and poetry. In these two poems, the first in Arabic and the second in Chinese, the number of syllables is a function of the line number. What do you notice? What do you wonder?

Application of K-Means Algorithm to Mapping Poverty Outline by Province in India

India has a second largest population and seventh largest country in the world, the UN data in 2018 recorded that there were 1,368,681,134 more people scattered throughout the Indian provinces. In addition, India also has a variety of social problems, one of which is poverty. The poverty line number in Indonesia needs to be improved. Data utilization techniques become new information called data mining. One of the most popular data mining methods is clustering using the k-means algorithm. K-means can process data without being notified in advance of the class label. This study will produce three provincial groups according to very low, low and sufficient income figures. Data processing of poverty line numbers in India using the k-means algorithm to get the results of the Davies Bouldin index of 0.271. These results are considered well enough because the closer the results obtained with zeros, the better the data similarity between members of the cluster.

Optimizing Bus Line Based on Metro-Bus Integration

Metros are usually built and added on the basis of a completed bus network in Chinese cities. After the metro construction, it is faced with the problem of how to adjust and optimize the original bus lines based on the new metro system. This research mainly proposes a bus line optimization method based on bus and metro integration. In the consideration of the geographical space, the cooperation and competition relationship between bus and metro lines is qualitatively introduced according to the geographical location and service range of metro (800 m radius) and bus (500 m radius) stations. The competition and cooperation indexes are applied to define the co-opetition relationship between bus and metro lines. The bus line optimization model is constructed based on the co-opetition coefficient and Changsha Metro Line Number 2 is chosen as a case study to verify the optimization model. The results show that the positive competition, efficient cooperation, and travel efficiency between metro and bus has been significantly enhanced after optimization. Moreover, this paper provides a reasonable reference for public transport network planning and resource allocation.