scholarly journals Limitations of di/dt technique in DC line protection

2016 ◽  
Author(s):  
M.A. Ikhide ◽  
S.B. Tennakoon ◽  
A. Griffiths ◽  
S. Subramanian ◽  
H. Ha ◽  
...  
Keyword(s):  
Dc Line

scholarly journals Extending the Input Voltage Range of Solar PV Inverters with Supercapacitor Energy Circulation

Electronics ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 88
Author(s):  
Kosala Gunawardane ◽  
Nalin Bandara ◽  
Kasun Subasinghage ◽  
Nihal Kularatna
Keyword(s):  
Input Voltage ◽  
Limited Attention ◽  
Solar Pv ◽  
Distributed Energy ◽  
Voltage Range ◽  
Grid Systems ◽  
Dc Line ◽  
Technical Specifications ◽  
Input Range ◽  
Frequency Inverter

Cleaner and greener energy sources have proliferated on a worldwide basis, creating distributed energy systems. Given the unreliable nature of the renewable sources such as solar and wind, they are traditionally based on inverters interfaced with legacy AC grid systems. While efficiency, output waveform quality and other technical specifications of inverters keep improving gradually, only limited attention is given to widening the input range of inverters. This paper presents a new supercapacitor assisted (SCA) technique to widen the input range of an inverter without modifying the inverter itself. Developing a prototype version of a 24 V DC input capable supercapacitor-assisted wide input (SCASWI) inverter using a supercapacitor circulation front end and a commercial 12 V DC line frequency inverter is detailed in the article, explaining how the SCASWI inverter technique doubles the input voltage while maintaining the useful characteristics of the commercial inverter. The new technique has the added advantage of DC-UPS capability based on a long-life supercapacitor module.

scholarly journals Small-Signal Stability Analysis for Multi-Terminal LVDC Distribution Network Based on Distributed Secondary Control Strategy

Electronics ◽  
2021 ◽  
Vol 10 (13) ◽  
pp. 1575
Author(s):  
Zhenyu Lv ◽  
Min Zhou ◽  
Qi Wang ◽  
Wenqiang Hu
Keyword(s):  
Control Strategy ◽  
Distribution Network ◽  
Small Signal ◽  
Small Signal Stability ◽  
Analysis Model ◽  
Secondary Control ◽  
Signal Stability ◽  
Small Signal Analysis ◽  
Dc Line ◽  
Small Signal Stability Analysis

This paper presents a detailed and accurate small-signal analysis model for a four-terminal low-voltage direct current (LVDC) distribution network with distributed secondary control strategy. To tackle the contradiction between power sharing accuracy and average voltage recovery ability of voltage source converters (VSCs), a distributed secondary control strategy is adopted, which is based on average consensus algorithm and local voting protocol. Furthermore, to analyze the stability of LVDC distribution network based on the proposed distributed secondary control strategy, a detailed and accurate small-signal analysis model is formulated which is derived from various non-linear state-space sub-models. The time-domain simulation and electromagnetic simulation are carried out to verify the validity and accuracy of the proposed model. Based on this model, the influence rules of main eigenvalues are summarized with the variation of PI control and DC line parameters. Time-domain simulations conducted in PSCAD are used to validate the operational limits of the secondary controllers and DC line obtained from the small-signal stability analysis.

An adaptive DC line fault recovery strategy for LCC-HVDC system based on voltage gradient

2022 ◽  
Vol 135 ◽  
pp. 107558
Author(s):  
Jing Ma ◽  
Ruifeng Wang ◽  
Chen Liu ◽  
Jiaming Zhang ◽  
A.G. Phadke
Keyword(s):  
Voltage Gradient ◽  
Fault Recovery ◽  
Recovery Strategy ◽  
Hvdc System ◽  
Dc Line

RESPONSE TO SELECTION FOR BODY WEIGHT OR FEED EFFICIENCY IN MICE TESTED ON CORN, RYE AND WHEAT DIETS

1986 ◽  
Vol 66 (2) ◽  
pp. 389-397
Author(s):  
R. I. McKAY ◽  
R. J. PARKER ◽  
W. GUENTER
Keyword(s):  
Body Weight ◽  
Feed Efficiency ◽  
Mass Selection ◽  
Response To Selection ◽  
Initial Weight ◽  
Commercial Diet ◽  
Final Weight ◽  
Dc Line ◽  
Selection For ◽  
Seven Generations

Mass selection for adjusted feed efficiency (AFE, g gain/g feed) and adjusted body weight (ABW, g) of male mice was practiced for seven generations on each of three diets: corn, rye and wheat. The three experimental diets, fed between 21 and 35 d, were isocaloric (approximately 16.5 MJ GE kg−1) and isonitrogenous (CP approximately 13%). A common commerical diet (PC) was fed at all other times. With each diet two control lines, randomly mated, were tested on either the experimental diets (DC) or a commercial diet (PC). Selection was based upon linear adjustment to a common initial weight (10 g) for either final weight (ABW) or feed efficiency (AFE) measured between 21 and 35 d of age. Response was determined as a deviation from the appropriate DC line. All animals were placed in specially designed individual cages during the test period. Half-sib estimates of heritability in the PC line were 0.13(± 0.11) for ABW and 0.19(± 0.10) for AFE. Half-sib estimates pooled across lines and diets were 0.16(± 0.07) for ABW and 0.28(± 0.07) for AFE. Realized heritabilities for ABW were 0.24(± 0.06), 0.06(± 0.07) and 0.14(± 0.06) for the corn, rye and wheat diets, respectively. Response to selection for AFE was poor with the highest heritability obtained on the wheat diet (h2 = 0.13 ± 0.02). Key words: Selection, mice, body weight, feed efficiency, diets

Novel transient current-based protection scheme for DC line faults in UHVDC system

2017 ◽  
Author(s):  
Yayu Yang ◽  
Nengling Tai ◽  
Chunju Fan ◽  
Xiaodong Zheng ◽  
Jian Liu ◽  
...  
Keyword(s):  
Transient Current ◽  
Protection Scheme ◽  
Dc Line
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