Jiangsu Goldwind Science & Technology Co., Ltd.

Sobute New Materials Co., Ltd

Nanjing Bote New Materials Co., Ltd.

Xuzhou Construction Machinery Group Co., Ltd.

Jiangsu Goodwe Power Supply Technology Co., Ltd.

Jiangsu Koyoe Energy Technology Co., Ltd.

Yong Yang

Jiaping Liu

Ye Li

Qianping Ran

Xingang Zhang

Xin Shu

Endi Zhai

Jing Fang

Jinzhi Liu

Yanwei Wang

Li Sun

Hongfeng Li

Han Yan

Pan Wang

Xiumei Wang

Qinwei Yu

Shengren Xie

Cheng Yu

Dandan Cui

Fahao Zhu

Jianliang Mao

Weiguo Huang

Xiaohu Fan

Lingfeng Mao

Min Huang

Junlong Ding

Gang Fang

Huiqing Wen

Jinjun Lu

Disclosed are a high-voltage three-phase four-bridge-arm topology structure and an inverter. The topology structure includes four bridge-arm circuits and a converter; one end of first bridge-arm circuit is connected to an A-phase high voltage line and the other end is connected to a first conversion module, one end of second bridge-arm circuit to a B-phase high voltage line and the other end to a second conversion module; one end of third bridge-arm circuit to a C-phase high voltage line and the other end to a third conversion module; one end of fourth bridge arm circuit to a ground line and the other end to a fourth conversion module, and the fourth bridge arm circuit is used to perform voltage compensation on the output voltages of the first bridge arm circuit, second bridge arm circuit, and third bridge arm circuit when the three phase high voltage lines are unbalanced.

High-voltage three-phase four-bridge-arm topology structure and inverter

The present invention discloses a multitype-adsorptive-group polycarboxylic acid water-reducing agent, consisting of 30-60 wt % of a macromolecule with multitype-adsorptive groups and water, the macromolecule with multitype-adsorptive groups has a polyethylene glycol side chain, and adsorption groups of the polymer backbone include a carboxylic acid group, a sulfonic acid group and a phosphoric acid group, the phosphoric acid group being linked to the backbone of the macromolecule with multitype-adsorptive groups by nucleophilic addition. The water-reducing agent of the present invention has significantly improved adaptability to different cements and aggregates while maintaining a high water reduction efficiency, compared with the conventional polycarboxylic acid water-reducing agent agent. It has a good water reducing efficiency in many different grades of cement, as well as a better resistance to aggregates containing more impurities such as machine-made sand.

Multitype-adsorptive-group polycarboxylic acid water-reducing agent, method for preparing the same and use thereof

The present disclosure relates to a foldable truss boom section, a truss boom and a crane. The foldable truss boom section includes: two chords that do not intersect with each other; at least two slideways fixedly disposed on each of the two chords, wherein each of the at least two slideways has at least two slideway fixing points; and at least two long web members connecting the two chords, wherein each of the at least two long web members has at least one sliding end which is slidable along the slideway and connected to the slideway at one of the at least two slideway fixing points, so that a cross-section state of the truss boom section is changeable.

Foldable truss boom section, truss boom and crane

A rotor rotation control system for a wind turbine and a control method thereof are provided. The control system includes a rotation unit configured to drive a rotor of the wind turbine to rotate relative to an engine base of the wind turbine, a driving unit configured to drive the rotation unit, and a processor configured to determine a bending moment load switching position on a rotating shaft of the rotor, and output an adjustment instruction to the driving unit based on the bending moment load switching position.

Rotor rotation control system and control method for wind turbine

Provided is a method for suppressing common-mode current of neutral line in T-type three-level three-phase inverter, the method of the present disclosure can effectively suppress LC filter resonance contained in the currents of a circulation neutral line and inversion side of a inverter, reduce the common-mode leakage current of the inverter, and improve the performance of the inverter.

Method for suppressing common-mode current of neutral line in T-type three-level three-phase inverter

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Jiangsu, China

Yong Yang