Zhejiang University

Zhejiang Geely Holding Group Co., Ltd

Zhejiang Gongshang University

Geely Automobile Research Institute (Ningbo) Co., Ltd

Zhejian University Advanced Electrical Equipment Innovation Center

Yan Yan

Tingna Shi

Changliang Xia

Chen Li

Zhen Zhang

Peng Song

Yanfei Cao

Weiren Dong

Huan Yao

Yiming Shen

Guozheng Zhang

Zhiqiang Wang

Zhanqing Zhou

Ruifeng Zhang

Xianming Yang

Guoyi Yang

Yue Zhao

Guangmu Yu

Daiping Jiang

Shuibao Guo

Mengting Ye

Shujing Li

Jihua Dai

Xiangjuan Ma

Ling Ye

Huajun Feng

Yijing Xia

Xiaojuan Zheng

Min Liao

Jinyan Gu

Yulan Jin

Gang Xing

Jiyong Zhou

A method for quickly determining the rotor position of a permanent magnet motor using the N-division approach is provided. The method involves converting the motor's three-phase stator current coordinates into the dq two-phase synchronous rotation coordinate system and identifying the initial rotor position area. By establishing a stator current cost model and utilizing the d-axis stator current, the initial rotor position can be obtained. Subsequently, the N-division approach is employed for iterative optimization to obtain the estimated rotor position and the final position region, leading to a rapid estimation of the permanent magnet motor's rotor position. This method incorporates the finite set model predictive control concept into a phase-locked loop based on stator current, eliminating the need for additional rotor position polarity judgment and invalid rotor position control variables.

Fast rotor position estimation method for permanent magnet motor based on N-division approach

A method for model predictive current control of a two-motor torque synchronization system, which belongs to the field of power electronics and motor control. The present disclosure takes an indirect matrix converter and a two-motor system which are coaxially and rigidly connected as a target, and takes two-motor torque synchronization performance and current tracking performance as main control objectives. A two-motor unified prediction model is established and a value function based on free components of error items is configured so as to solve the problems in which when model predictive current control is performed on a two-motor system, setting of a value function weighting coefficient needs to be performed manually, and consequently the setting process is complicated and an erroneous switch state combination is likely to be selected.

Method for model predictive current control of two-motor torque synchronization system

Provided are a power supply control system and a control method thereof. The power supply control system includes: a transformer connected to a power grid; an output socket connected to the transformer via an alternating current bus and configured to be connected to an electric device in the electric vehicle charging station; and an energy storage system including an AC/DC bidirectional converter and an energy storage battery connected to the alternating current bus via the AC/DC bidirectional converter. The energy storage system is configured to be controlled to, in response to the power supply control system being in an uninterruptible power supply mode: switch the AC/DC bidirectional converter into an inversion state; and output no electric energy when the power grid has a normal voltage and supply electric energy only by the energy storage system when the power grid has an abnormal voltage.

Power supply control system and control method thereof

The invention proposed a space vector pulse width modulation (SVPWM) method for any level cascaded H-bridge inverter. The multilevel space vector diagram is re-divided, and the coordinates of the nearest three vectors (NTVs) are directly obtained by judging the position of the reference vector. The duty cycles of the NTVs is calculated through additional vector which is equivalent to the reference vector. Then, the switching states are obtained by zero-sequence component and coordinate transformation, and the desired reference vector is synthesized for the SVPWM modulation. The invention realizes multilevel modulation in Cartesian coordinates without any iterative calculation, and the calculation is independent of the level number. Furthermore, the locating of the reference vector and the calculation of the duty cycles are simplified, and the calculation complexity is reduced.

Space vector pulse width modulation method for any level cascaded H-bridge inverter

A direct-drive type annular flexible transportation system and a collaborative control method thereof are provided. The direct-drive type annular flexible transportation system includes an annular base, a primary excitation type linear motor, an power supplying module, a power driving module, a position detection module, and a wireless communication module. The primary excitation type linear motor includes a long stator and a plurality of movers. The long stator is formed by connection of stator iron cores presenting a multi-segment cogging structure and is installed on the annular base. Each of the movers includes a short primary, a power driving module, a position detection module, and a wireless communication module. The short primary is formed by an asymmetrically-structured permanent magnet array, an armature winding, and a primary iron core.

Direct-drive type annular flexible transportation system and collaborative control method thereof

The present disclosure provides a predictive control method of current increment for a permanent magnet synchronous motor includes: substituting a mathematical expression of a stator voltage during one control period into a continuous time domain current model to obtain a discrete current prediction model and a predicted current at the next time point; obtaining a predicted current increment from a current increment prediction model by subtracting a predictive current at a present time point from a predictive current at a next time point; establishing a cost function according to a preset reference current increment and the predicted current increment; obtaining an optimal voltage increment by minimizing the cost function; superposing the optimal voltage increment on a stator voltage of a present control period to obtain an optimal stator voltage of a next control period for controlling control the permanent magnet synchronous motor.

Predictive control method of current increment for permanent magnet synchronous motor under high-speed operation

A three-dimensional electrode-ozone oxidation-electrocatalytic membrane coupled wastewater treatment device, including a circulating fluidized bed reactor. The circulating fluidized bed reactor includes a funnel-shaped internal, a truncated cone, a fiber ball filter, a gas-liquid distribution plate, an inner cylinder, an intermediate cylinder and an outer cylinder. The inner cylinder, the intermediate cylinder and the outer cylinder are coaxial. The inner cylinder is an electrocatalytic membrane assembly; the intermediate cylinder is a gas diffusion electrode; and the outer cylinder is a stainless-steel mesh. A particle electrode is filled between the intermediate cylinder and the outer cylinder, and between the intermediate cylinder and the inner cylinder. The intermediate cylinder is connected to a negative electrode. The inner cylinder and the outer cylinder are connected to a positive electrode. A wastewater treatment method using the device is also provided herein.

Device for advanced degradation of organic wastewater and application thereof

The present invention discloses a type II Pseudorabies virus attenuated strain and its preparation method and application. The attenuated strain of pseudorabies virus is gE/TK-double-deficient strain, which is named as PRV-HD/c strain of PRV dual-deletion strain, and the accession number is CGMCC No. 14325. The attenuated strain of the pseudorabies virus of the present invention is obtained from the newly isolated strain of pseudorabies virus type II after deletion of the gE and TK double genes and has reduced pathogenicity and strong immunogenicity and is inactivated by the attenuated strain of pseudorabies virus vaccines or live attenuated vaccines, which can provide effective immunity to PRV susceptible animals such as pigs and mice.

Type II pseudorabies virus attenuated strain, its preparation method and application

Growing community of inventors

Hangzhou, China

Yan Yan