General Electric Company

Wuhua Li

David Grey Smith

Yunfeng Liu

Jianwu Li

Zhuohui Tan

Wei Ren

Yingqi Zhang

Jiao Liu

Yunjie Gu

Yuxiang Wang

David Smith

The present invention discloses a power generation system including a double-fed induction generator, a power converter, and a controller. The double-fed induction generator includes a rotor and a stator coupled to a grid. The power converter includes a rotor side converter coupled to the rotor of the generator, a grid side converter coupled to the grid, and a DC bus coupled between the rotor side converter and the grid side converter. The controller includes a rotor side controller for controlling the rotor side converter and a grid side controller for controlling the grid side converter. The rotor side controller includes a compensator having a transfer function and configured to counter a negative resistance effect of the generator to suppress sub-synchronous oscillations. The present invention further discloses a system for suppressing sub-synchronous oscillations and a method for controlling operation of a power system.

Power generation system, system for suppressing sub-synchronous oscillation and method for controlling operation of power system

An amplifier comprises a power source, a load network comprising a load and a resonance circuit, an input branch having a first end electrically coupled to the power source and a second end electrically coupled to the load network, and an active switch having one terminal electrically coupled to the second end of the input branch. The input branch including at least one parallel-LC-circuit configured to provide an infinitely large impedance at harmonics of a determined order.

Class-E amplifier and lighting ballast using the amplifier

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Shnaghai, China

Wuhua Li