Chevron (hk) Limited

Southeast University

Chervon (hk) Limited

Chervon Limited

Ming Chen

Wei Liu

Wu Chen

Wei Gu

Junya Duan

Yuexiang Zhang

Jianjun Shuang

Guannan Lou

Xiaohong Lin

Ping Xu

Ge Cao

Shuai Xue

A distributed predictive control based voltage restoration scheme for microgrids, comprising: step 10) adopting a distributed finite time observer to acquire the global reference voltage for restoring the voltage of each local controller; step 20) each local controller adopts a droop control to acquire the local voltage value of each generation, and adds a secondary voltage compensation term into the droop characteristic formula to form the voltage reference value of a distributed generation; step 30) establishing a trended prediction model; step 40) acquiring a predictive control term at a current time as the secondary voltage compensation command, and acting on the local controllers; and step 50) determining, whether the local voltage of each distributed generation of the microgrid reaches the voltage reference value under the secondary voltage compensation command.

Distributed predictive control based voltage restoration scheme for microgrids

A battery pack cooling and charging device includes a charging module for a battery pack, a cooling fan, a power source module and a cooling fan control module. The cooling fan control module is capable of controlling the cooling fan for cooling and is connected with the cooling fan. During the charging operation, a rotational speed of the cooling fan for cooling the battery pack and a charging module is changed by detecting parameters such as fan operation time, a battery pack internal resistance, a charging module temperature, and a battery pack voltage. The rotational speed of the cooling fan is reasonably adjusted, thus noise of the cooling fan is reduced and energy consumption is reduced according to different phases of the charging process by regarding one parameter or combinations of parameters as conditions for changing the rotational speed of the fan.

Battery pack cooling and charging device and method

A laser line generating device includes a conical prism, a light-emitting unit for projecting light onto the conical prism, a housing for receiving the light-emitting unit and permitting the light emitted by the light-emitting unit to pass there through, and translucent columns disposed between the housing and the conical prism for connecting the housing and the conical prism, wherein the apex of the conical prism faces towards the light-emitting unit.

Laser line generating device

A condenser lens suitable for a laser rangefinder includes a lens body wherein the lens body is formed with or has attached thereto a deviation correction area that is located on the light emitting side thereof for correcting focus deviation upon reception of light scattered by a close range object. A center of the body is located inside the deviation correction area of the lens. The deviation correction area may include one or more deviation correction zones.

Laser rangefinder and condenser lens thereof for receiving a light ray

The present invention provides a level having a body which has a first end, a second end opposed to the first end, and a plane surface which connects the first and second ends, at least one level indicating device mounted to the body, and two end caps which are mounted onto the first and second ends, respectively. Each end cap has an outer end which is distributed by a plurality of resilient portions with small surface area for absorbing impact if the level is accidentally dropped or impacted.

Level provided with impact-absorbing end caps

Growing community of inventors

Nanjing, China

Ming Chen