A Verification Test Result of Isolated Operation of a Microgrid Configured with New Energy Generators and a Study of Improvement of Voltage Control

2009 ◽  
Vol 129 (1) ◽  
pp. 57-65 ◽  
Author(s):  
Jiro Sumita ◽  
Kojiro Nishioka ◽  
Yasuhiro Noro ◽  
Yozo Ito ◽  
Masanori Yabuki ◽  
...  
Keyword(s):  
Voltage Control ◽  
New Energy ◽  
Verification Test ◽  
Test Result

A verification test result of islanding operation of a microgrid configured with new energy generators and a study of improvement of voltage control

2011 ◽  
Vol 176 (2) ◽  
pp. 41-52 ◽  
Author(s):  
Jiro Sumita ◽  
Kojiro Nishioka ◽  
Yasuhiro Noro ◽  
Yozo Ito ◽  
Masanori Yabuki ◽  
...  
Keyword(s):  
Voltage Control ◽  
New Energy ◽  
Islanding Operation ◽  
Verification Test ◽  
Test Result

Development of On-Site Fast Detector Used for Waterproof Membrane Joint Peeling Strength

2014 ◽  
Vol 919-921 ◽  
pp. 359-363
Author(s):  
Jia Long Xu ◽  
Yi Zheng ◽  
Tang Xi Wang ◽  
Peng Du ◽  
Ze Hua Liu
Keyword(s):  
Quality Evaluation ◽  
Construction Site ◽  
Construction Quality ◽  
Angle Deviation ◽  
Peeling Strength ◽  
Verification Test ◽  
Quality Decision ◽  
Test Result ◽  
Fast Detector ◽  
Quality Construction

Development of on-site fast detector using for waterproof membrane joint peeling strength has improved the waterproof membrane on-site construction quality evaluation level and construction quality decision capability. Detectors capabilities in two-dimensional movement and multi-angle detection fill the domestic gap. Verification test result of the detector shows that, the peeling force will fluctuate within certain scope with peeling of joints; the longer the membrane is stretched, the greater the error is; the error caused by angle deviation is about 7% and error caused by joint deviation is about 4%, and the test result satisfies the evaluation requirement on waterproof membrane joint peeling strength at construction site. The development of detector improves the construction quality, construction management and acceptance of waterproof membrane.

Research on Smart Home Controlling System Based on Fuzzy Data Fusion Theory

2014 ◽  
Vol 602-605 ◽  
pp. 1127-1130
Author(s):  
Chao Wang ◽  
Tao Tan ◽  
Xuan Yin ◽  
Nan Chen ◽  
Tong Xin Xiao
Keyword(s):  
Data Fusion ◽  
Energy Supply ◽  
Smart Home ◽  
Fuzzy Data ◽  
Energy Preservation ◽  
Controlling System ◽  
New Energy ◽  
Fusion Theory ◽  
Test Result

To solve the unstable and insufficient energy supply problems in Smart Home Controlling System and improve the he cooperation between several sensors with different functions and parameters, a new energy supply module based on the vibration in the air and the fuzzy data fusion theory applied to the cooperation among sensors are discussed in this paper. The test result proves that this kind of module works well to provide enough energy preservation for the whole WSN system and data fusion theory enhances the credibility and preciseness of the surveillance result.

scholarly journals A REVIEW OF VOLTAGE CONTROL STRATEGIES FOR LOW-VOLTAGE NETWORKS WITH HIGH PENETRATION OF DISTRIBUTED GENERATION

2020 ◽  
Vol 10 (3) ◽  
pp. 60-65
Author(s):  
Klara Janiga
Keyword(s):  
Control Method ◽  
Low Voltage ◽  
Control Strategies ◽  
Voltage Control ◽  
Distribution Networks ◽  
High Penetration ◽  
Starting Point ◽  
New Energy ◽  
Local Methods ◽  
Network Operation

Deterioration of voltage conditions is one of the frequent consequences of connecting an increasing number of photovoltaic sources to the low-voltage (LV) power grid. Under adverse conditions, i.e. low energy consumption and high insolation, microgeneration can cause voltage surges that violate acceptable limits. Research shows that the increase in voltage is the main limitation for connecting new energy microsources to the LV network and forces the reconstruction of the network. An alternative to costly modernizations can be the implementation of appropriate strategies for controlling network operation to maintain the voltage at the required level. The article presents an overview of the methods and concepts of voltage control in a low-voltage network developed so far to mitigate the undesirable phenomenon of voltage boosting. The focus was mainly on local methods—not requiring communication infrastructure—as best suited to the conditions of Polish distribution networks. Gathering the results of many tests and simulations carried out in different conditions and on different models allowed for the formulation of general conclusions and can be a starting point for further research on a control method that can be widely used in the national power system.

Efficiency Analysis of Low-Grade Energy Recovery System Based on Scroll Expander

2014 ◽  
Vol 1070-1072 ◽  
pp. 402-406
Author(s):  
Ji Dai Wang ◽  
Gang Tian Si ◽  
Jun Ying Wei
Keyword(s):  
Energy Recovery ◽  
Influential Factors ◽  
Low Grade ◽  
System Efficiency ◽  
Energy Recovery System ◽  
Influence Curves ◽  
Scroll Expander ◽  
Recovery System ◽  
New Energy ◽  
Test Result

A new energy recovery system based on scroll expander is presented according to the characteristics of low-grade energy in this paper. It is discussed for the expression of the system efficiency and its influential factors with the method of Exergy Analysis. And the influence curves of relationship between the expander’s inlet pressure and system efficiency are obtained through computer simulation and laboratory experiments. The test result of the comparison of different the recycling system shows that the recycling method based on scroll expander is more efficiently than others in the area of recycling low-grade energy.

Item Context and /s/ Phone Articulation Test Results

1972 ◽  
Vol 15 (4) ◽  
pp. 852-860 ◽  
Author(s):  
Zoe Zehel ◽  
Ralph L. Shelton ◽  
William B. Arndt ◽  
Virginia Wright ◽  
Mary Elbert
Keyword(s):  
Test Score ◽  
Sound Production ◽  
Broad Context ◽  
Test Results ◽  
Production Task ◽  
Test Result

Fourteen children who misarticulated some phones of the /s/ phoneme were tape recorded articulating several lists of items involving /s/. The lists included the Mc-Donald Deep Test for /s/, three lists similar to McDonald’s but altered in broad context, and an /s/ sound production task. Scores from lists were correlated, compared for differences in means, or both. Item sets determined by immediate context were also compared for differences between means. All lists were found to be significantly correlated. The comparison of means indicated that both broad and immediate context were related to test result. The estimated “omega square” statistic was used to evaluate the percentage of test score variance attributable to context.

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