Nr Electric Co., Ltd

Nr Engineering Co., Ltd

Nr Electric Engineering Co., Ltd.

Other

Lei Pan

Yunlong Dong

Jie Tian

Yu Lu

Quanrong Shen

Ruhai Huang

Haiying Li

Chao Liu

Jiang Lu

Chongxue Jiang

Defeng Qiu

Xinbao Wang

Baoli Chang

Dongming Cao

Gang Li

Nannan Wang

Zhaoqing Hu

Hui Wang

Ke Wang

Jiudong Ding

Fei Wang

Shunke Sui

Fengfeng Ding

Xiaofei Pang

Xiaosa Yuan

Xianlai Hu

Lang Zhong

Jingling Hu

Huaxin Guo

Xiuda Ma

Hua Xie

Baoshun Zhang

Qiwen Zhou

Yizhe Lin

Tieqiang Ren

Feixiang Wu

An intelligent anti-icing material and a preparation method and use thereof are disclosed. The intelligent anti-icing material includes a hydrophobic resin and a nickel-titanium alloy wire embedded in the hydrophobic resin. When the surrounding temperature decreases, the hydrophobic resin in the intelligent anti-icing material shrinks, and the nickel-titanium alloy wire featured by thermoelastic martensitic transformation undergoes phase transformation and expands, which changes the direction of the expansion force inside the ice layer, and thus tiny cracks occur at the interface between the ice layer and the surface of the material, thereby reducing the adhesion of the ice layer to the surface of the material, accelerating the spontaneous shedding of the ice layer, without heating, and achieving an excellent anti-icing effect.

Intelligent anti-icing material and preparation method and use thereof

The present invention provides a series compensator and a control method. The series compensator includes a series transformer, a series transformer bypass device, a voltage source converter, a high-speed converter bypass device, a high-speed switch, and a reactor. The reactor and the high-speed switch are connected in parallel to form a current limiting module; one winding of the series transformer has two ends connected in series to a line, and the other winding thereof is sequentially connected to the current limiting module and the high-speed converter bypass device; the voltage source converter and the high-speed converter bypass device are connected in parallel; and at least one winding of the series transformer are connected in parallel to at least one series transformer bypass device. The series compensator of the present invention indirectly provides the current limiting module, so as to effectively limit the short-circuit current of a system, reduce the fault current to which the compensator is subjected, and improve the reliability of an alternating current system and the series compensator. Moreover, the current limiting module has a low voltage level, and the high-speed switch has a small breaking current, thereby providing good industrial applicability.

Series compensator and control method

A method and apparatus for suppressing the impact of a compensator on line distance protection is provided, wherein the method comprises: obtaining a first current of a line connected to a compensator or series converters in the compensator, and a first voltage of a bus connected to the compensator or the line connected to the compensator; exiting the series converters and series transformers if the first current is greater than a preset current threshold and a duration is greater than a first preset time threshold; exiting the series converters and the series transformers if the first voltage is less than or equal to a preset voltage threshold and duration is greater than a second preset time threshold set the output voltage of the series converters to zero, and if a second current of an element corresponding to the first current meets conditions which the first current needs to meet; and otherwise, canceling the setting of the output voltage of the series converters to zero and obtaining a first current if a second voltage of the line corresponding to the first voltage is greater than the preset voltage threshold and the duration is greater than a third preset time threshold.

Method and apparatus for suppressing impact of compensator on line distance protection

A starting and stopping method for a static synchronous series compensator (SSSC) is provided. A starting process includes: connecting a converter to a shunt transformer, and closing a breaker which connect the AC system and the shunt transformer to charge the converter until the DC voltage is stable; opening the breaker, and connecting the converter to a series transformer through a change-over switch; and deblocking the converter, and controlling a current of a bypass switch of the series transformer to approach zero. A stopping process includes: switching a control mode of the converter to make the current of the bypass switch approaches zero when closed the bypass switch, then controlling a current of the series transformer to be gradually reduced to zero to make the series transformer out of service, and blocking the converter.

Starting method and stopping method for a static synchronous series compensator

A series compensation device suitable to double-circuit lines is disclosed. The device includes one series transformer and one converter. One converter and dual-circuit transmission lines are respectively connected to three windings of one series transformer. In the solution provided in the present application, the device can be independently installed in a power transmission system to be used as a static synchronous series compensator, and can also be used as a component of a unified power flow controller, a convertible static compensator, an interline power flow controller and a unified power quality conditioner to be connected to a power transmission system device in series. The device can save the capacity of a converter, improve the application efficiency of the series compensation device, and reduce the cost and area occupation.

Series compensation device applicable to double-circuit line

A line power control method and system for a unified power flow controller includes outer loop line power control, inner loop valve side current control, and converter valve control. Series-side converter valve side current reference values Iand Iare calculated by means of the outer loop line power control according to line power instructions Pand Qthat are input, a measured line power U, and measured line power Pand Q; a converter output voltage reference value Uis calculated by means of the inner valve side current control according to the valve side current reference values that are output by means of the outer loop power control, a measured valve side current, and a measured valve side voltage; and finally, a converter outputs, according to the voltage reference value, a corresponding voltage to control line power to achieve a reference value.

Line power control method and system for unified power flow controller

A unified power flow controller for a double-circuit transmission line comprises at least one parallel-connection transformer, three current converters, at least two series-connection transformers, a parallel-connection side switching circuit, a series-connection side switching circuit and a direct current common bus. The series-connection transformers connected with at least one group of by-pass switches in parallel. The three current converters connected to each loop line in series after being connected with at least one series-connection transformer through the series-connection side switching circuit. The three current converters connected to an alternating current system after connected with at least one parallel-connection transformer through a parallel-connection side switching circuit starting circuit. The three current converters are connected to the direct current common bus through a transfer switch.

Unified power flow controller for double-circuit line

Growing community of inventors

Jiangsu, China

Lei Pan