scholarly journals Enhancement the stability of power system using optimal location of FACTS devices

2020 ◽  
Vol 18 (2) ◽  
pp. 648
Author(s):  
Ali Najim Abdullah ◽  
Ahmed Majeed Ghadhban ◽  
Hayder Salim Hameed ◽  
Husham Idan Hussein
Keyword(s):  
Power Network ◽  
Performance Factors ◽  
Facts Devices ◽  
Clearing Time ◽  
Thyristor Controlled Series Capacitor ◽  
Overall Performance ◽  
Set Up ◽  
The Stability ◽  
And Control ◽  
Better Than

<p><span>This paper proposes a steady-state of the Static Var Compensator (SVC) &amp; Thyristor Controlled Series Capacitor (TCSC) set up for enhancing the damping overall performance and growing the integral clearing time (CCT) of a power network. The indispensable clearing time is carried out through increasing the time fault interval until the gadget loses stability. Increasing the CCT can be contribute to reliability of the safety gadget, decrease the protection machine ranking and cost. In order to attain most enhancement of machine stability via optimizing location, sizing and control modes of SVC and TCSC. Models and methodology for putting and designing shunt FACT’s units SVC (injected reactive strength Q) and series FACT’s devices TCSC (chose capacitive region) are examined in a 6-bus system. Performance factors are described to show validation of SVC and TCSC on extraordinary conditions. It is proven that the SVC is better than TCSC. </span></p>

scholarly journals Corporate Entrepreneurship Performance: Findings From Government-Linked Companies in Malaysia

2019 ◽  
Vol 9 (4) ◽  
pp. 248
Author(s):  
Harry Entebang ◽  
Richard T. Harrison
Keyword(s):  
Corporate Entrepreneurship ◽  
Business Environment ◽  
Structured Interviews ◽  
Senior Managers ◽  
Operation Costs ◽  
Overall Performance ◽  
The Government ◽  
Set Up ◽  
Better Than

A nation’s economic growth has been associated with the role of entrepreneurship. While recognising the work of entrepreneurship on the mindset and behaviour of individual entrepreneurs, research into an organisational perspective of entrepreneurship continues to emerge due to unprecedented developments occurring around the world over the last two decades. Notably, past studies have postulated that entrepreneurial organisations tend to perform better than conservative organisations. In this vein, the Malaysian government has set up Government-linked companies (GLCs) to enable these entities to become more effective, efficient, and competitive, which can assist the government in strengthening its economy. On the other hand, despite considerable improvements, the overall performance of GLCs has been unsatisfactory. Given the hostility and dynamism of the business environment, GLCs have no other option but to improve and perform better. Recognising this, the purpose of the study is to determine the underlying forces forcing GLCs to improve and to identify forms of corporate entrepreneurship (CE) pursued by GLCs. Building on the outcomes of semi-structured interviews with senior managers in GLCs, the need for CE is fostered by competition and market pressure, technological changes, and increases in operation costs. Finally, future studies of CE in Malaysia may consider other aspects of CE, including issues and challenges in pursuing CE effectively within GLCs business environment.

scholarly journals THE EFFICIENCY OF CHARCOAL AS A FILTER MEDIA IN NON-VEGETATION CONSTRUCTED WETLAND SUBSURFACE-FLOW SYSTEM (SF) FOR AMMONIA, CHEMICAL OXYGEN DEMAND, AND IRON TREATMENT OF LANDFILL LEACHATES

2010 ◽  
Vol 3 (3) ◽  
pp. 135-140
Author(s):  
Ahmad Md. Noor ◽  
Pedy Artsanti ◽  
P.E. Lim ◽  
S. Suryani ◽  
H.P.S Abdul Khalil
Keyword(s):  
Chemical Oxygen Demand ◽  
Flow System ◽  
Oxygen Demand ◽  
Filter Media ◽  
Landfill Leachates ◽  
Standard Methods ◽  
Iron Treatment ◽  
Overall Performance ◽  
Set Up ◽  
Better Than

The thermal Charcoal for domestic used was crushed into powder and mixed with gravel. Four reactors of different proportion and size of charcoal and gravel were set up without vegetation. Sample of landfill leachates obtained from site of Pulau Burung Landfill, Penang, was introduced into the reactors. Ammonia, chemical oxygen demand (COD), and iron of inlet and outlet from four reactors were analyzed by standard methods. Result shows that overall performance of removing ammonia and iron were much better than COD.   Keywords: charcoal, leachate, filter media

scholarly journals Analysis of regenerated roof and instability support control countermeasures in a steeply dipping working face

2019 ◽  
Vol 38 (4) ◽  
pp. 1082-1098 ◽  
Author(s):  
Xiaolou Chi ◽  
Ke Yang ◽  
Qiang Fu
Keyword(s):  
Physical Simulation ◽  
Middle Part ◽  
Metal Mesh ◽  
Roof Structure ◽  
Working Face ◽  
Roof Fall ◽  
Set Up ◽  
The Stability ◽  
And Control ◽  
Compaction Degree

Roof regeneration in coal mining occurs when the remaining bottom slice of thick coal is re-mined. In view of the challenges of roof fall and instability support of a regenerative roof in the mining of steeply dipping coal seams, combined with the geological and engineering conditions of the working face in the Panbei Coal Mine, the mechanism of the instability of the regenerative roof and support is studied, and control countermeasures are proposed. Based on the comprehensive combination of the measurement of the roof structure, physical simulation, numerical simulation, and theoretical analysis, the cementation and compaction degree of the regenerated roof were described. The caving and sliding law of the regenerated roof after bottom slice mining was explored, and the model of support dumping and sliding instability under the roof fall state was established. The results obtained yielded three main findings. Firstly, the compaction degree of the regenerative roof is higher than that of the middle part of the working face, and the compaction degree of the upper part of the working face is the smallest. Secondly, the overburden structure instability of the bottom slice underwent six stages. The fracture of the cantilever beam and the slippage of gangue are the reasons for the enhancement of the acoustic signal at each stage. Finally, the upper part of the stope was identified as the crucial zone in the prevention and control of the support instability. A moving method of metal mesh with pressure and roof scraping was developed, and the support anti-overturning and anti-skid jack was set up to effectively control the stability of the support and roof fall, for safe and efficient mining of a steeply dipping coal seam under a regenerative roof.

Optimizing Control Methods of Airport Pipeline Refueling Process

2015 ◽  
Vol 738-739 ◽  
pp. 1007-1011
Author(s):  
Xiao Zhong Zhang ◽  
Fan Qin Meng ◽  
Jie Hui Wang
Keyword(s):  
Intelligent Control ◽  
Control Methods ◽  
Fuzzy Pid Control ◽  
Pipe Line ◽  
Optimizing Control ◽  
The Stability ◽  
Stability And Accuracy ◽  
Classical Control ◽  
And Control ◽  
Better Than

Due to the non-linearity and long delay of airport pipe line refueling system, it is difficult for classical control methods to ensure stable pumping pressure and refueling flow. To improve the stability of the refueling process, the paper introduces human-simulated intelligent control (HSIC) method to the recognization of refueling status, online self-adjusting and control of refueling parameters. Simulation shows that the stability and accuracy of HSIC control methods were better than that of classical PID and fuzzy PID control.

The Coordinated Control Strategies of Voltage Stability Based on Expert Rules

2013 ◽  
Vol 732-733 ◽  
pp. 772-777
Author(s):  
Fei Zhang ◽  
Chun Lin Guo ◽  
Ling Yun Jiang ◽  
Lin Yang ◽  
Jian Zhang
Keyword(s):  
Voltage Stability ◽  
Control Strategies ◽  
Coordinated Control ◽  
Control Methods ◽  
Stability Problems ◽  
Process Characteristics ◽  
Control Rules ◽  
Facts Devices ◽  
And Control ◽  
Better Than

According to the process characteristics and control methods of different voltage stability problems, the paper researches control rules and strategies of the voltage stability, then sets up controllers of FACTS devices on a simulation platform, and puts forward the coordinated control strategies of voltage stability problems based on expert rules. The simulation studies have shown that control effects of multiple FACTS devices are significantly better than a single device, and the coordinated control methods based on the expert rules is more conducive to improving voltage stability.

scholarly journals PENGATURAN SUHU UNTUK MENGATASI BAYI TERBAKAR BERBASIS ARDUINO DAN LABVIEW PADA INFANT INCUBATOR

eLEKTRIKA ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 21
Author(s):  
Dicky Rivaldo Ramdani ◽  
Andi Kurniawan Nugroho ◽  
Budiani Destyningtias
Keyword(s):  
Linear Regression ◽  
Premature Baby ◽  
Adc Value ◽  
System A ◽  
Premature Babies ◽  
Infant Incubator ◽  
Fan Speed ◽  
Set Up ◽  
The Stability ◽  
And Control

<p>An incubator is a place designed to maintain a certain temperature condition. Incubators are often found in hospitals and farms. In hospitals, the Incubator functions to warm newborns, or premature babies. On farms, this incubator is usually used for egg hatchers and as a place for newly hatched chicks. Incubators are usually in the form of a room or box (box) of a certain size. In this research will be designed a prototype to modify the infant incubator by adding sensors to regulate the temperature and control using a Arduino microcontroller. This incubator has a measurement system and temperature regulation using LM35 sensors, heaters and fans as actuators that can cool the incubator room with Arduino as controlling. Temperature setting will be monitored by LABVIEW. In the Arduino system a program can be set up that can adjust the temperature . The temperature required by the premature baby, so that it can maintain the stability of the temperature. If the temperature in the incubator is smaller than the temperature setting, the heater will turn on and the fan speed will decrease to increase the temperature according to the settings entered. If the temperature in the incubator is greater than the temperature setting entered, the heater will turn off. The results showed that the linear regression value between the temperature values with the ADC value of y = 0.4883x with a determination coefficient of 1, while the linear regression value between the temperature with a voltage value of y = 99.481x with a coefficient of 0.9984.<br />Keywords: Infant Incubator, temperature sensor, LM35.</p>

scholarly journals Analyzing the impact of wind generation on the transient stability

2015 ◽  
Vol 18 (3) ◽  
pp. 86-91
Author(s):  
Binh Thi Thanh Phan ◽  
Thien Ngoc Ho
Keyword(s):  
Transient Stability ◽  
Circuit Breaker ◽  
Wind Generation ◽  
Power Network ◽  
Clearing Time ◽  
The Stability ◽  
The Impact

The wind generation causes some troubles on the stability of power network. Observing the critical clearing time of circuit breaker with existence of wind generation, one conclusion about the degrading of stability will be drawn. The location and the penetration level of this generation are also considered in this paper. The 14 buses IEEE network is examined with the soft ware PSAT.

Command and Control

2018 ◽  
Vol 8 (1) ◽  
pp. 1-10
Author(s):  
Stuart D. H. Beveridge ◽  
Simon T. Henderson ◽  
Wayne L. Martin ◽  
Joleah B. Lamb
Keyword(s):  
Air Transport ◽  
Flight Safety ◽  
Flight Crew ◽  
Systematic Review Methodology ◽  
Role Assignment ◽  
Performance Factors ◽  
Policy Review ◽  
Reported Effect ◽  
And Control ◽  
Research And Policy

Abstract. Compared with other team settings, flight crew in air transport present a unique situation where the leader or supervisor regularly engages in active control. When the captain is assigned cognitively demanding pilot flying duties, the subordinate and often less experienced first officer must perform equally crucial monitoring and support duties. Using a systematic review methodology, this study reviews the reported effect of crew role assignment on flight safety outcomes. Our review identified 18 relevant studies and suggests crew performance factors linked to flight safety are affected by crew role assignment. Findings suggest a greater number of inherent obstacles may exist for optimal crew performance with the captain as pilot flying, raising the need for further specific research and policy review in this area.

Pittenweem Priory and the conventuality question

2017 ◽  
Vol 68 (1) ◽  
pp. 19-37 ◽  
Author(s):  
Anthony Lodge
Keyword(s):  
Fifteenth Century ◽  
Traditional View ◽  
Archaeological Evidence ◽  
Significant Development ◽  
New Mother ◽  
Set Up ◽  
And Control

Pittenweem Priory began life as the caput manor of a daughter-house established on May Island by Cluniac monks from Reading (c. 1140). After its sale to St Andrews (c. 1280), the priory transferred ashore. While retaining its traditional name, the ‘Priory of May (alias Pittenweem)’ was subsumed within the Augustinian priory of St Andrews. Its prior was elected from among the canons of the new mother house, but it was many decades before a resident community of canons was set up in Pittenweem. The traditional view, based principally on the ‘non-conventual’ status of the priory reiterated in fifteenth-century documents, is that there was ‘no resident community’ before the priorship of Andrew Forman (1495–1515). Archaeological evidence in Pittenweem, however, indicates that James Kennedy had embarked on significant development of the priory fifty years earlier. This suggests that, when the term ‘non-conventual’ is used in documents emanating from Kennedy's successors (Graham and Scheves), we should interpret it more as an assertion of superiority and control than as a description of realities in the priory.

Determination of trace concentrations of copper by FIA-FAAS after preconcentration on chelating sorbents

1989 ◽  
Vol 54 (7) ◽  
pp. 1785-1794 ◽  
Author(s):  
Vlastimil Kubáň ◽  
Josef Komárek ◽  
Zbyněk Zdráhal
Keyword(s):  
Sampling Frequency ◽  
Copper Determination ◽  
Flow Rates ◽  
Sample Injection ◽  
Injection Flow ◽  
Chelating Sorbents ◽  
Set Up ◽  
Trace Concentrations ◽  
Better Than

A FIA-FAAS apparatus containing a six-channel sorption equipment with five 3 x 26 mm microcolumns packed with Spheron Oxin 1 000, Ostsorb Oxin and Ostsorb DTTA was set up. Combined with sorption from 0.002M acetate buffer at pH 4.2 and desorption with 2M-HCl, copper can be determined at concentrations up to 100, 150 and 200 μg l-1, respectively. For sample and eluent flow rates of 5.0 and 4.0 ml min-1, respectively, and a sample injection time of 5 min, the limit of copper determination is LQ = 0.3 μg l-1, repeatability sr is better than 2% and recovery is R = 100 ± 2%. The enrichment factor is on the order of 102 and is a linear function of time (volume) of sample injection up to 5 min and of the sample injection flow rate up to 11 ml min-1 for Spheron Oxin 1 000 and Ostsorb DTTA. For times of sorption of 60 and 300 s, the sampling frequency is 70 and 35 samples/h, respectively. The parameters of the FIA-FAAS determination (acetylene-air flame) are comparable to or better than those achieved by ETA AAS. The method was applied to the determination of traces of copper in high-purity water.

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