公开(公告)号：US20240405564A1

公开(公告)日：2024-12-05

申请号：US18016094

申请日：2022-02-23

Applicant: SHANDONG UNIVERSITY

Inventor： Yongji CAO ,  Hengxu ZHANG

IPC: H02J3/38 ,  H02J3/24 ,  H02J3/32

Abstract: Provided is a physically synchronized solar-storage hybrid power generation system, belongs to the field of new energy technology, comprising: a PV module, comprising a PV unit and a first converter unit and a second converter unit electrically connected to the PV unit, respectively; an energy storage module, comprising an energy storage unit and a third converter unit, a first end and a second end of the energy storage unit being electrically connected to the first converter unit and the third converter unit, respectively; a grid connection module, a first end thereof is electrically connected to the second converter unit and the third converter unit, and a second end thereof is connected to a target large power grid; and a control module, being electrically connected to the PV module, the energy storage module and the grid connection module, respectively, and being configured to set control parameters of the solar-storage hybrid power generation system, and to adjust an operating state of the energy storage unit by judging a logical relationship between a power of the PV unit and a power of the target large power grid for synchronous grid connection of the solar-storage hybrid power generation system.

公开(公告)号：US20180147951A1

公开(公告)日：2018-05-31

申请号：US15570489

申请日：2016-05-05

Applicant: SHANDONG UNIVERSITY

Inventor： Zongshuai JIN ,  Hengxu ZHANG ,  Yingle FAN

IPC: B60L11/18 ,  H02J7/00 ,  G01S19/13

CPC classification number: B60L11/1844 ,  B60L11/1842 ,  B60L2240/622 ,  G01S19/13 ,  H02J3/14 ,  H02J3/32 ,  H02J7/0026 ,  H02J7/0027 ,  H02J7/34 ,  Y02B70/3225 ,  Y02E60/721 ,  Y02T10/7055 ,  Y02T90/168 ,  Y04S10/126 ,  Y04S20/222 ,  Y04S30/12

Abstract: The invention discloses an electric vehicle charging pile control system and method considering grid frequency safety. The electric vehicle charging pile control system comprises a grid single-phase power input port, a voltage transformer, an AD conversion chip, a first data processor and a second data processor connected successively; the first data processor is further connected with a data real-time display device and a GPS/Beidou signal receiver respectively; the second data processor communicates with an electric vehicle charging pile and an electric vehicle battery pack respectively; and the second data processor is further connected with a man-machine interaction device. The invention has the beneficial effects that: the frequency of a power system can be monitored in real time; when the frequency is relatively low after a fault of the power system, part of unimportant electric vehicle charging loads are cut off to reduce the active power vacancy of the system; low-frequency load reduction is effectively prevented; and the time for restoring the frequency of the power system is shortened.

公开(公告)号：US20240426891A1

公开(公告)日：2024-12-26

申请号：US18611740

申请日：2024-03-21

Applicant: Shandong University

Inventor： Fang SHI ,  Hengxu ZHANG ,  Zhaoru HAN ,  Zongshuai JIN ,  Xiaobin WANG

IPC: G01R31/08

Abstract: A high-impedance fault positioning method and system based on synchronous Lissajous curve characteristics are provided. The method includes: acquiring a bus zero-sequence differential voltage and a feeder zero-sequence current of a faulty line; constructing a first Lissajous curve in a characteristic frequency band range based on the bus zero-sequence differential voltage and the feeder zero-sequence current; when the proportion of the faulty line is less than a set threshold value and the slope of the first Lissajous curve is negative, determining that high-impedance faults have occurred in the faulty line; constructing a second Lissajous curve based on the bus zero-sequence differential voltage and the section zero-sequence current, performing linear fitting on discrete data points of the second Lissajous curve to obtain a fitted curve; and when the slope of the fitted curve is negative for at least three consecutive periods, determining that high-impedance faults have occurred in the section.