China University of Petroleum

Qingdao University of Science and Technology

Qingdao University of Technology

Qingdao Port International Co., Ltd.

Qingdao New Qianwan Container Terminal Co., Ltd.

Hao Wang

Kun Wang

Yang Xu

Wei Wang

Zhihua Zhang

Ting Xu

Changhai Zhou

Tao Yue

Peng Guo

Xu Yang

Datong Wang

Fujun Lu

Lin Zhu

Chengmin Liu

Yongtao Tian

Mingming Sun

Liangang Zhang

Pengpeng Xie

Huanlong Cui

Chengsan Xu

Xiuliang Sun

A system and method for determining a critical suspension speed of an impeller in a solid-liquid stirred tank belongs to the technical field of critical speed determination. A relationship is established between a voltage of a measurement electrode and a solid-liquid suspension state to avoid the problems of strong subjectivity and large deviation appearing in existing critical suspension speed determination based on empirical formulas and human eye observation. An electrode voltage ratio is taken as a determination criterion, which is only related to a spatial density of solid particles in a liquid phase.

System and method for determining critical suspension speed of impeller in solid-liquid stirred tank

The present invention relates to the technical field of fault location of distributed energy resources connected flexible DC distribution network, and disclosed a fault location method, system and application of bipolar short-circuit of two-level VSC-type photovoltaic-connected flexible DC distribution network, wherein, directions of positive currents of DC feeders during fault are used to locate a fault section; a bipolar short-circuit distance measurement model covering interactions and responses of systems is established according to equivalent circuits of transient periods; and fault location is done by obtaining a distance to fault with electric parameters and information of the fault. With the technical solutions offered in the present invention, accurate location of the fault can be done with the electric parameters and information of the fault, a key technology is provided for quick location of bipolar short-circuit of flexible DC distribution network, power supply reliability of the system is further improved, errors due to differentiation of the conventional distance measurement methods are effectively avoided, the location results are more accurate and of high stability, in this way, further development of flexible DC distribution network can be promoted and building of a new power system in the background of energy transition is facilitated.

Fault location method, system and application of two-level VSC type photovoltaic connected bidirectional flexible DC distribution network

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Qingdao, China

Hao Wang