Investigation of the Impacts of Large-Scale Wind Power Penetration on the Angle and Voltage Stability of Power Systems

The complexity of power systems has increased in recent years due to the operation of existing transmission lines closer to their limits, using flexible AC transmission system (FACTS) devices, and also due to the increased penetration of new types of generators that have more intermittent characteristics and lower inertial response, such as wind generators. This changing nature of a power system has considerable effect on its dynamic behaviors resulting in power swings, dynamic interactions between different power system devices, and less synchronized coupling. This paper presents some analyses of this changing nature of power systems and their dynamic behaviors to identify critical issues that limit the large-scale integration of wind generators and FACTS devices. In addition, this paper addresses some general concerns toward high compensations in different grid topologies. The studies in this paper are conducted on the New England and New York power system model under both small and large disturbances. From the analyses, it can be concluded that high compensation can reduce the security limits under certain operating conditions, and the modes related to operating slip and shaft stiffness are critical as they may limit the large-scale integration of wind generation.

A Wireless Charging System Applying Phase-Shift and Amplitude Control to Maximize Efficiency and Extractable Power

Wireless power transfer (WPT) is an emerging technology with an increasing number of potential applications to transfer power from a transmitter to a mobile receiver over a relatively large air gap. However, its widespread application is hampered due to the relatively low efficiency of current Wireless power transfer (WPT) systems. This study presents a concept to maximize the efficiency as well as to increase the amount of extractable power of a WPT system operating in nonresonant operation. The proposed method is based on actively modifying the equivalent secondary-side load impedance by controlling the phase-shift of the active rectifier and its output voltage level. The presented hardware prototype represents a complete wireless charging system, including a dc-dc converter which is used to charge a battery at the output of the system. Experimental results are shown for the proposed concept in comparison to a conventional synchronous rectification approach. The presented optimization method clearly outperforms state-of-the-art solutions in terms of efficiency and extractable power.

Specifications covering furniture and equipment for the Library,

Mode of access: Internet.

Power for operating machinery in printing houses, a treatise on the methods of applying power to printing presses and allied machinery, with particular reference to electric drive./

Mode of access: Internet.

Operator's, organizational, direct support, and general support maintenance manual : power supply PP-2309C/U (NSN 6130-00-752-2215).

"2 February 1982."

Organizational, direct support, and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply PP-7757/U (NSN 6130-01-098-2532).

"5 August 1983."

Organizational, direct support, and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply PP-7751/U (NSN 6130-00-245-3251) and power supply PP-7752/U (NSN 6130-00-148-6993).

"24 October 1983."

Operator's, organizational, direct support, and general support maintenance manual : power supply, chemical agent automatic alarm, M10 (NSN 6665-00-859-2225).

"October 1971."

Direct support and general support maintenance manual : power supply PP-3990/FRC-93 (Collins PM-2) (NSN 5820-00-985-8171), power supply PP-4151/FRC-93 (Collins 516F-2) ...

"June 1976."

Direct support, and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply, PP-7710/TYC-39(V), (NSN 5805-01-127-0725).

Includes index.

Organizational, direct support, and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply, PP-7833/U, (NSN 6130-00-249-2748).

Includes index.

Organizational, direct support , and general support maintenance repair parts and special tools list (including depot maintenance repair parts and special tools) for power supply/DC dual, (0-40VDC/0-1.5A), (NSN 6130-00-065-6811).

Includes index.

Operator, organizational, direct support, and general support maintenance manual (including repair parts and special tools list) : power supply PP-4606B/G (NSN 6130-00-504-0327).

"2 April 1973."

Operator, organizational, direct support, and general support maintenance manual : power supply PP-3940A/G (NSN 6130-00-460-2148).

"September 1971."

Operator's, organizational, direct support, and general support maintenance manual : power supply PP-7662/U (NSN 4940-01-064-7342).

"November 1979."