公开(公告)号：US20240380208A1

公开(公告)日：2024-11-14

申请号：US18032958

申请日：2022-10-17

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Gaotong WU ,  Bin DUAN ,  Jinqiu SONG

IPC: H02J3/18 ,  H02J3/38 ,  H02M7/219

Abstract: A power compensation control method and apparatus for a high-power multi-functional efficient charging system. A topology structure of the charging system includes at least two parallel high frequency link matrix converters. The power compensation control method includes: calculating a difference between an input voltage phase of an ith converter and an ideal reference input current phase under a dq two-phase synchronous rotating coordinate system, where i is an odd number; calculating, according to the above difference, a required rotating phase angle of a space current vector of an (i+1)th converter, where by total instantaneous reactive power at input sides of the ith converter and the (i+1)th converter is zero; correspondingly rotating the vector, and judging a sector to which the rotated vector belongs; and generating a corresponding control pulse signal based on the corresponding sector and modulation ratio, so as to act on the (i+1)th converter to realize power compensation.

公开(公告)号：US20230184627A1

公开(公告)日：2023-06-15

申请号：US18010462

申请日：2021-06-15

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Qi ZHANG ,  Ke LI ,  Naxin CUI ,  Yunlong SHANG ,  Bin DUAN

IPC: G01M17/007 ,  G07C5/00 ,  H04L67/10 ,  H04L67/12

CPC classification number: G01M17/007 ,  G07C5/008 ,  H04L67/10 ,  H04L67/12

Abstract: Provided is a system and method for the distributed networked test of electric vehicles based on a cloud platform, comprising a cloud computing platform and a plurality of remote test benches, wherein the remote test benches, being provided at least two, to form a remote distributed networked structure and transmit test data to the cloud computing platform; the cloud computing platform, being in real-time bidirectional data communication with the remote test bench and configured to receive each test data in real-time, perform a data cleaning, a data classing washing, a data fusion and a data mining, extract useful data information from the test data, build corresponding a data model and a mechanism model on the cloud computing platform according to historical data and a mechanism of control object, control for different test benches, and complete a fault diagnosis and an early warning.

公开(公告)号：US20220221517A1

公开(公告)日：2022-07-14

申请号：US17614547

申请日：2020-05-28

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Fazheng WEN ,  Bin DUAN ,  Rui ZHU ,  Junming ZHANG

IPC: G01R31/367 ,  G01R31/385

Abstract: The present invention discloses a high-precision battery model parameter identification method and system based on output response reconstruction. The method includes: determining a pulse function based on a relationship between a measured voltage signal and a true voltage signal and a relationship between the true voltage signal and a current excitation signal; reconstructing a voltage signal based on the pulse function and the current excitation signal; and obtaining equivalent circuit model parameters of a battery based on the reconstructed voltage signal and the current excitation signal. The present invention has the following beneficial effects: the reconstructed output signal has good authenticity, and the precision of parameter identification is high. Since a complex tuning process of the filter is removed, a parameter identification process is more concise and clearer.

公开(公告)号：US20210391719A1

公开(公告)日：2021-12-16

申请号：US17159884

申请日：2019-12-28

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Xi LIU ,  Hua GENG ,  Xiangyang XING

IPC: H02J3/01 ,  H02J3/16

Abstract: A hybrid cascaded APF topology and control method therefor for improving the ability of a system to compensate for higher harmonics, raise the quality of electric energy of output currents, and reduce costs. The topology includes: a three-phase cascaded H-bridge including bridge arms of three phases, each bridge arm including a plurality of H-bridge cells connected in series, and the bridge arms of the three phases connected to a power system needing active filtering via inductors; and a three-phase H-bridge circuit connected at star connection points of the three-phase cascaded H-bridge, the three-phase H-bridge circuit including branches of the three phases and two capacitors connected in parallel across the branches of the three phases, and the branch of each phase including two switching transistors connected in series, where switching transistors of the H-bridge cells use Si devices, and the switching transistors of the three-phase H-bridge circuit use SiC devices.

公开(公告)号：US20240377440A1

公开(公告)日：2024-11-14

申请号：US18032681

申请日：2022-09-27

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG

IPC: G01R31/08

Abstract: A method for sensing power grid information based on nonlinear robust estimation, including: acquiring an actual power grid phase voltage signal; obtaining a nonlinear state-space distorted power grid model based on the actual power grid phase voltage signal and a phase voltage signal virtual orthogonal signal; establishing an H∞ smoothing estimation performance indicator based on the nonlinear state-space distorted power grid model, converting an H∞ smoothing estimation problem into a generalized H2 smoothing estimation problem according to the H∞ smoothing estimation performance indicator, and constructing an H∞ smoothing estimator; and obtaining an initial sensed amplitude value and an initial sensed phase value of a power grid voltage signal by using the H∞ smoothing estimator, and performing zero-crossing point detection on the initial sensed amplitude value and the initial sensed phase value of the power grid voltage signal to obtain sensed amplitude, frequency and phase values of a distorted voltage.

公开(公告)号：US20240369642A1

公开(公告)日：2024-11-07

申请号：US18038259

申请日：2022-10-17

Applicant: SHANDONG UNIVERSITY

Inventor： Bin DUAN ,  Peng HUANG ,  Chenghui ZHANG ,  Yongzhe KANG ,  Yunlong SHANG

IPC: G01R31/392 ,  G01R31/367 ,  G01R31/3828 ,  G01R31/3842 ,  G01R31/389

Abstract: A method and system for evaluating power battery aging state and screening retirement, wherein the method includes: performing first-level screening according to appearance and voltage data of a power battery; obtaining charging test data in a set time of the power battery subjected to the first-level screening, performing derivation and secondary derivation based on a capacity-voltage curve of the battery, respectively extracting a first index and a second index of a set peak of the derivated curve, and respectively using the first index and the second index to determine a battery category and consistency, thereby realizing second-level screening; and performing third-level screening on the battery subjected to the second-level screening based on a direct current internal resistance of the battery. By using the method and system, the detection time can be effectively reduced, the screening test cost can be reduced and the evaluation and screening precision can be improved.

公开(公告)号：US20210334912A1

公开(公告)日：2021-10-28

申请号：US17218641

申请日：2021-03-31

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Bo SUN ,  Haoran LI

IPC: G06Q50/06 ,  H02J3/14 ,  H02J13/00

Abstract: A method and system for obtaining a design scheme of a collaboratively optimized integrated energy system which resolves a problem of independent optimization failure caused by multi-device and multi-condition, structure complexity and diversity, and strong coupling of multi-energy flow operation. The method includes: determining types and a quantity of candidate devices, and taking a total quantity as a system scale during optimization; determining a quantity and types of variables using a unified model representing the integrated energy system as a chain structure; performing simulation by using a chain operating mode to obtain operating data, and solving variables to obtain a ranking result of the devices in the chain structure, by using a structure order, installed capacity, and control parameters of the devices as variables, and by using primary energy consumption, energy supply costs, and carbon emission as objectives; and obtaining a system design result according to the solving result.

公开(公告)号：US20200169097A1

公开(公告)日：2020-05-28

申请号：US16492836

申请日：2017-10-19

Applicant: SHANDONG UNIVERSITY

Inventor： Chenghui ZHANG ,  Yunlong SHANG ,  Qi ZHANG ,  Naxin CUI ,  Bin DUAN

IPC: H02J7/00

Abstract: A modularization system and a method for battery equalizers based on multi-winding transformers. By the inverse-parallel connection of the secondary sides of the odd and the even multi-winding transformers, the balancing in battery modules and between the odd and the even groups is realized based on forward conversion, and the balancing between the odd and the even groups and the automatic demagnetization for the transformers are realized based on flyback conversion. By only using a pair of complementary control signals, the direct, automatic and simultaneous balancing from any battery cell to any battery cell in the battery strings can be realized, thereby greatly improving the balancing efficiency and speed, and effectively improving the consistencies between the battery cells. The system has the advantages of high balancing efficiency, fast balancing speed, small size, low cost, high reliability, easy modularization, simple control, and nonuse of voltage detection circuits and demagnetizing circuits, etc.