Results 261 to 270 of about 2,076,023 (303)

Modeling and control of thyristor controlled phase shifting transformer

2015 IEEE Innovative Smart Grid Technologies - Asia (ISGT ASIA), 2015
Aiming at the two-core symmetric discrete thyristor controlled phase shifting transformer (TCSD-TCPST), its modeling and control strategies are studied in this paper. Firstly, the mathematical model of TCSD-TCPST considering its equivalent impedance is deduced.
Yang Xiaonan, Chen Hongkun, Zhao Xiaochun, Wang Zhengfeng, Wu Xu, Song Yunting, Ding Jian   +6 more
openaire   +1 more source

Phase-shifting interferometry with feedback control using heterodyne phase detection

Optics Letters, 2008
A phase-shifting interferometer with feedback control using heterodyne phase detection was developed. A composite heterodyne phase detection method for obtaining feedback signals was proposed. Interference fringe stabilization and accurate pi/2 phase shifts under micrometer-order vibrations were successfully demonstrated using a digital high-speed lock-
openaire   +2 more sources

Controlling Power Flow with Phase Shifting Equipment

Transactions of the American Institute of Electrical Engineers, 1930
In the operation of an electric power distributing system involving various kinds of networks, a fundamental necessity is that each transforming and transmitting unit carry a reasonable share of the total load. In the case of a single system that has been developed in a coordinated manner the problem of load division has not in general been troublesome
openaire   +1 more source

Control-Oriented Modeling of Wireless Power Transfer Systems With Phase-Shift Control

IEEE Transactions on Power Electronics, 2020
This paper investigates control-oriented modeling of a class of wireless power transfer systems with a phase-shift controlled inverter. Two methods are studied: the conventional analytical modeling method which is based on physical laws, and the refined instrumental variable method which is based on sampled data.
Fengwei Chen, Hugues Garnier, Qijun Deng, Marian K. Kazimierczuk, Xiangtao Zhuan   +4 more
openaire   +1 more source

Phase-shift control in electro-optical analyzers

SPIE Proceedings, 1994
Adjustment and stabilization of an optimal value of control voltage is a common problem in spectrum polarimetry when using electrooptical polarization analyzers. In this paper we give a description of a method to determine the quarter-wave phase shift when handling control signals of square form (of the type of a `meander').
Victor M. Grigoryev, Nikolai I. Kobanov
openaire   +1 more source

Practical phase control technique for alternating phase-shift mask fabrication

SPIE Proceedings, 2000
Techniques of fabricating altPSMs of single trench structure by quartz etching have been developed. A two-step etching process was adopted to make the side-etching structure. Shifter areas were etched by dry-method in first step and by wet-method in second step.
Masahiko Takahashi, Akihiro Miyake, Hidetaka Saitou, Hiroyuki Miyashita, Shiaki M. Murai   +4 more
openaire   +1 more source

Phase-shifting transformer control and protection settings verification

2018 71st Annual Conference for Protective Relay Engineers (CPRE), 2018
San Diego Gas & Electric (SDG&E) initiated a project to add two parallel 400 MVA (+31.3° to −80.1°) phase-shifting transformers (PSTs) at a 230 kV interconnection substation. California ISO (CAISO) proposed the PST project to provide flow control between SDG&E and Comision Federal de Electricidad (CFE) 230 kV systems during critical N-1 or N-1-1 500 kV
Bill Cook, Michael J. Thompson, Kamal Garg, Milind Malichkar   +3 more
openaire   +1 more source

CONTROL OF STATIC PHASE SHIFTING TRANSFORMERS WITH LEAKAGE REACTANCE

IFAC Proceedings Volumes, 1983
Abstract Analysis has shown that a phase shifting transformer can enhance the stability of a power system. Methods of adjusting phase shifting transformers and control algorithms to realize the stability improvement have been demonstrated. However, in earlier work the effect of leakage reactance and reactance inserted to limit fault currents has not ...
G. Güth, A. Rey, R. Baker
openaire   +1 more source

Cascade Dual Buck Inverter With Phase-Shift Control

IEEE Transactions on Power Electronics, 2012
This paper presents a new type of cascade inverter based on dual buck topology and phase-shift control scheme. The proposed cascade dual buck inverter with phase-shift control inherits all the merits of dual buck type inverters and overcomes some of their drawbacks.
Pengwei Sun, Chuang Liu, Jih-Sheng Lai, Chien-Liang Chen   +3 more
openaire   +1 more source

Analysis of Phase-Shift Controlled Thermoregulator Circuits

Review of Scientific Instruments, 1956
The power sensitivity and the line voltage variation effects of a phase-shifting thermoregulator making use of a thermal element in a Wheatstone bridge and a grid-controlled thyratron are expressed in terms of the circuit parameters. The conditions for line voltage variation compensation are derived and the calculated results are found to be in good ...
openaire   +1 more source