Shandong University

Shandong Jiaotong University

Imperial College London

Shandong Beixingquan Energy Co., Ltd.

Yuanyuan Sun

Kaiqi Sun

Qianqian Li

Lei Ding

Zhijie Liu

Kejun Li

Yahui Li

Pengbo Shan

Liang Zhang

Demin Qi

Shulin Yin

Ruize Sun

Bowen Li

Jiaojiao Kong

Baoyu Gao

Xiaowei Zhang

Yuanzong Song

Zhenshan Huang

Qinyan Yue

Yuchuan Li

Jie Lou

Kehan Zhang

Gang Shen

Yuan Gao

Quanrui Hao

Zhijie Ma

Yirou Lai

Deyi Huang

Kaifang Fu

Qingshen Xu

The present invention provides a method and system of self-adaptive setting of closed-loop parameters for suppressing PV coupling harmonics, comprising: acquiring node voltages and node currents of PV grid-connected inverters; constructing harmonic coupling admittance matrix according to the node voltages and node currents; calculating an amplitude of each element in the constructed harmonic coupling admittance matrix; screening contribution sources of coupling harmonics according to the calculated amplitude of the each element; evaluating quantitatively harmonic admittance of the PV grid-connected inverter according to screened contribution sources; and, carrying out optimization iteration for double-closed-loop PI control parameters of inverter with objective of minimizing the coupling harmonics of the PV grid-connected inverter according to results of the quantitative evaluation of the harmonic admittance, to complete self-adaptive setting of closed-loop parameters for suppressing PV coupling harmonics.

Method and system of self-adaptive setting of closed-loop parameters for suppressing photovoltaic coupling harmonics

A fast-response photovoltaic (PV) simulator based on an improved deadbeat predictive current control (DPCC). Compared to actual PV modules, there is a response time at the output of the PV simulation. Currently widely used PV simulation have a long response time, which cannot meet the performance testing requirements of high-performance grid-connected PV inverters. Based on the energy balance of the inductor during the absorption and dissipation phases, the current control law of the output inductor in the PV simulation was studied in a single switching period, thereby establishing the required DPCC model. An integral compensation eliminates the steady-state error in current tracking caused by nonlinear factors such as time delay and mismatched parameters, enabling its wide application in engineering. For the proposed PV simulator, the transient response time can be reduced to 1.1 ms and significantly shorter than widely used PV simulation.

Fast-response PV simulator based on improved deadbeat predictive current control

The invention belongs to the technical field of harmonic contribution evaluation, and particularly relates to a system for tracing harmonic sources based on a cloud-edge-terminal collaboration and a method thereof, comprising: terminal module, collecting and transmitting real-time harmonic data to edge module; edge module, comprising plurality of edge computing servers deployed for the transformer substations and the transformer districts by units, realizing hierarchical control between edge computing servers according to voltage levels, and transmitting harmonic sources tracing task through hierarchical interactions between the edge computing servers; the edge computing server receiving harmonic sources tracing service request performs the tracing task, and feeds tracing result back to central module; and, central module, comprising cloud server receiving harmonic sources tracing service request initiated by user, determining edge computing server offloaded by the request, storing final tracing result from entire the system, and matching typical harmonic source according to disturbance source information.

System for tracing harmonic sources based on cloud-edge-terminal collaboration and method thereof

A method for preparing un-hardened ceramic micro-electrolysis fillers by industrial solid wastes comprises: (1) Scrap iron, lignin, red mud and clay was completely mixed as mass ratio (4-5):(2-3):(1-3):3 and then made into pellets; (2) The dried pellets were sintered without oxygen. The production could be used in wastewater treatment, which could not only increase biodegradability but also decrease CODCr and toxicity in a short time.

Method for preparing anti-hardening granulous ceramic iron-carbon micro-electrolysis filler by using industrial waste

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Jinan, China

Yuanyuan Sun