Medium-Voltage Impedance Measurement Unit for Assessing the System Stability of Electric Ships

2017 ◽  
Vol 32 (2) ◽  
pp. 829-841 ◽  
Author(s):  
Marko Jaksic ◽  
Zhiyu Shen ◽  
Igor Cvetkovic ◽  
Dushan Boroyevich ◽  
Rolando Burgos ◽  
...  
Author(s):  
Marko Jaksic ◽  
Zhiyu Shen ◽  
Igor Cvetkovic ◽  
Dushan Boroyevich ◽  
Rolando Burgos ◽  
...  

Author(s):  
Karl Schoder ◽  
Mischa Steurer ◽  
Ferene Bogdan ◽  
John Hauer ◽  
James Langston ◽  
...  

Author(s):  
Ferenc Bogdan ◽  
John Hauer ◽  
James Langston ◽  
Karl Schoder ◽  
Mischa Steurer ◽  
...  

Author(s):  
Igor Cvetkovic ◽  
Zhiyu Shen ◽  
Marko Jaksic ◽  
Christina DiMarino ◽  
Fang Chen ◽  
...  

2013 ◽  
Vol 479-480 ◽  
pp. 530-534
Author(s):  
Van Dien Doan ◽  
Ta Hsiu Tseng ◽  
Pei Hwa Huang

The main objective of this paper is to report the small signal stability analysis of Vietnam Power System which has a longitudinal network structure with the consideration of power system stabilizer (PSS) in operation to enhance the damping of inter-area oscillation by using local as well as remote feedback signals via phasor measurement unit (PMU). Both methods of frequency domain and time domain analyses are used to investigate the performance of the power system. The study results show that by proper selection of PSS installation locations and remote feedback signals, power oscillations on the tie-line will be reduced and the system stability is thus improved.


Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4607
Author(s):  
Jian Zhang ◽  
Mingjian Cui ◽  
Yigang He

As wind farms have great influences on power system stability, it is essential to develop an adaptive as well as robust equivalent model of it. In this paper, a detailed equivalent model of PMSG wind farm and initialization method is developed. The trajectory sensitivity of parameters is analyzed. Then, the key parameters are estimated using improved Genetic Learning Particle Swarm Optimization (GLPSO) hybrid algorithm with phasor measurement unit (PMU). The description and generalization capability, stability for parameter identification of the equivalent model under wake effects, and when some wind turbines are off-line or wind speed is unknown after an event are analyzed. The maximum differences between the values of estimated parameters and their real ones are less than 10% for the proportional magnification constant of DC voltage controller Kp2 and grid side current controller Kp3. The convergence rate and global optimization performance of the improved GLPSO hybrid algorithm is 0.5 times higher than the classical particle swarm optimization algorithm (PSO) and genetic algorithm (GA).


2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shuo-Yao Qu ◽  
Meng Dai ◽  
Shuo Wu ◽  
Zhi-Rang Lv ◽  
Xin-Yu Ti ◽  
...  

AbstractChest electrical impedance tomography (EIT) is a promising application which is used to monitor the ventilation and perfusion of the lung at the bedside dynamically. The aim of the study was to introduce the first Chinese made chest EIT device for ICU application (Pulmo EIT-100). The system design of the hardware and software was briefly introduced. The performance of the system was compared to PulmoVista 500 (Dräger Medical) in healthy volunteers. The EIT system Pulmo EIT-100 consists of impedance measurement module, power supply module, PC all-in-one machine, medical cart and accessories. The performance of the system current source and voltage measurement unit was tested. A total of 50 healthy lung volunteers were prospectively examined. Subjects were asked to perform repetitive slow vital capacity (SVC) maneuvers with a spirometer. EIT measurements were performed in the following sequence during each SVC with: (1) Pulmo EIT-100, (2) PulmonVista500, (3) Pulmo EIT-100 and (4) PulmonVista500. Linearity and regional ventilation distribution of the reconstructed images from two devices were compared. The output frequency stability of the current source was 2 ppm. The amplitude error within one hour was less than 0.32‰. The output impedance of the current source was about 50kΩ. The signal-to-noise ratio of each measurement channel was ≥ 60 dB. For fixed resistance measurements, the measured values drifted about 0.08% within one hour. For human subjects, the correlations between the spirometry volume and EIT impedance from two devices were both 0.99 ± 0.01. No statistical significances were found in the parameters investigated. The repeatability (variability) of measures from the same device was comparable. Our EIT device delivers reliable data and might be used for patient measurement in a clinical setting.


Author(s):  
Gagari Deb ◽  
Kabir Chakraborty

Complexity of modern power network and Large disturbance results voltage collapse. So, voltage security analysis is important in power system. Indicators are helpful in voltage stability analysis, as they give information about the state of the system. In this paper a new indicator namely Distribution System Stability Indicator (DSSI) has been formulated using the information of Phasor Measurement Unit (PMU).The proposed indicator (DSSI) is tested on standard IEEE 33 bus radial distribution system. The suggested indicator is also applicable to the equivalent two bus system of a multi-bus power system. The proposed indicator is calculated for different contingent conditions at different system load configurations. The result of DSSI is verified with the standard indicator (VSI) which proves applicability of the proposed indicator. The bus voltages of all the buses at base loading and at maximum loading are evaluated for base data and for tripping of most critical line.


Sign in / Sign up

Export Citation Format

Share Document