Chinese Academy of Sciences

Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd.

Goldwind Science & Technology Co., Ltd.

Beijing Hina Battery Technology Co., Ltd.

Liquan Chen

Yongsheng Hu

Liangnian Lv

Hong Li

Kun Tang

Xuejie Huang

Yunming Li

Linqin Mu

Yaxiang Lu

Shuyin Xu

Yuesheng Wang

A high voltage ride through (HVRT) device and method, a wind power converter, and a wind turbine set. The HVRT device comprises: an unloading module (), which comprises a brake module () and a first switching element () that form a series connection with one another, and which is configured to discharge energy when a HVRT occurs; a controller (), which is configured to detect a direct current (DC) bus voltage so as to control the first switching element () to be turned on when a HVRT occurs and the DC bus voltage is greater than a first threshold and less than or equal to a second threshold, such that the brake module () inputs and discharges energy; and a passive driving circuit (), which applies a turn-on signal to a control terminal of the first switching element () by using the DC bus voltage in response to the DC bus voltage being greater than the second threshold, such that the brake module () inputs and discharges energy.

High voltage ride through device and method, wind power converter, and wind turbine set

The present disclosure provides a cooling control method and a cooling control apparatus for a generator of a wind turbine. A cooling device of the generator and an intermittent operation device are connected to a frequency converter, the frequency converter controls the cooling device and the intermittent operation device to start up at different times, and the cooling control method includes: under a condition that a starting condition of the intermittent operation device is determined to be satisfied, calculating a predicted temperature of the generator; under a condition that the predicted temperature is less than or equal to a predetermined threshold temperature, using the frequency converter to control the intermittent operation device to start up to execute the predetermined related action; and using the frequency converter to control the cooling device to start up to cool the generator.

Cooling control method and cooling control apparatus for generator of wind turbine

Embodiments of the present disclosure are a pitch-based negative electrode material for a sodium-ion battery and related methods and applications. The method comprises: placing a pitch recursor into a muffle furnace to allow the pitch precursor to experience pre-oxidation for 2 to 6 hours at a temperature ranging from 200&#xb0; C. to 350&#xb0; C., to obtain pre-oxidized pitch; placing the pre-oxidized pitch into a high-temperature carbonization furnace, and increasing the temperature to 1300&#xb0; C. to 1600&#xb0; C. at a temperature increase speed of 0.5&#xb0; C./min to 5&#xb0; C./min, and carrying out thermal treatment on the pre-oxidized pitch in an inert atmosphere for 1 to 10 hours, to allow the pre-oxidized pitch to experience carbonization reactions, oxygen in the pre-oxidized pitch being used for breaking an ordered structure of the pitch during the carbonization of the pre-oxidized pitch, so as to form a wedge-shaped voids disordered structure.

Pitch-based negative electrode material for sodium-ion battery, and preparation method therefor and applications thereof

The invention discloses a sodium ion secondary battery anode material, and a preparing method and application thereof. The material is an amorphous carbon material, and is obtained by performing high-temperature pyrolyzing on coal as a main raw material, the material is prepared by using coal and a hard carbon precursor as raw materials, mechanical mixing after adding a solvent, drying, and crosslinking, curing and pyrolyzing under an inert gas atmosphere, or prepared by using coal as a raw material, and pyrolyzing under an inert gas atmosphere. The sodium ion secondary battery prepared from the amorphous carbon material as anode material has lower cost and higher work voltage, and is stable in cycle and good in safety.

Sodium ion secondary battery anode material and preparing method and application thereof

A layered oxide material, a preparation method, an electrode, a secondary battery and use are disclosed. The layered oxide material has a general chemical formula NaCuFeMnMO, in which M is an element that is doped for replacing the transition metals; x, y, i, j, k, and &#x3b2; are respectively the molar ratios of respective elements, provided that x, y, i, j, k, and &#x3b2; satisfy the relations: y+i++j+k=1, and x+my+2i+3j+4k=2(2+&#x3b2;), where 0.8&#x2266;x&#x2266;1, 0&#x3c;i&#x2266;0.3, 0&#x3c;j&#x2266;0.5, 0&#x3c;k&#x2266;0.5, 0.02&#x2266;&#x3b2;&#x2266;0.02, and m is the valence of M. The layered oxide material has a space group of Rm.

Layered oxide material, preparation method, electrode plate, secondary battery and use

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Beijing, China

Liquan Chen