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A novel cascaded H-bridge photovoltaic inverter with flexible arc suppression function

Global Energy Interconnection 2024年第4期7卷 513-527页

作者： Junyi Tang Wei Gao College of Electrical Engineering and Automation Fuzhou UniversityFuzhou 350108P.R.China

This paper presents a novel approach that simultaneously enables photovoltaic(PV)inversion and flexible arc suppression during single-phase grounding *** compensate for ground currents through an arc-elimination function,while outputting a PV direct current(DC)power *** method effectively reduces the residual grounding *** reduce the dependence of the arc-suppression performance on accurate compensation current-injection models,an adaptive fuzzy neural network imitating a sliding mode controller was *** online adaptive adjustment law for network parameters was developed,based on the Lyapunov stability theorem,to improve the robustness of the inverter to fault and connection ***,a new arc-suppression control exit strategy is proposed to allow a zerosequence voltage amplitude to quickly and smoothly track a target value by controlling the nonlinear decrease in current and reducing the regulation *** results showed that the proposed method can effectively achieve fast arc suppression and reduce the fault impact current in single-phase grounding *** to other methods,the proposed method can generate a lower residual grounding current and maintain good arc-suppression performance under different transition resistances and fault locations.

关键词： photovoltaic inverter Flexible arc suppression Adaptive control Fuzzy neural network Sliding mode control Exit strategy

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Fault Tolerant Control Method for Three-Level photovoltaic inverter Based on Redundant Voltage Space Vector 36

Fault Tolerant Control Method for Three-Level Photovoltaic I...

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第36届中国控制会议

作者： Xulong Zhang Feng Wang Wen Ji Shuyun Qiao Yanjing Cao Department of Information and Electrical Engineering Xuzhou University of Technology

ISBN: (纸本)9781538629185

Power devices short circuit or open circuit fault can have serious impact on the reliability of the photovoltaic inverter system during the operational *** the basis of analysis of the fault characteristics and types with neutral point clamped three-level photovoltaic inverter as the research object,fault diagnosis logic is *** tolerant control strategy for three-level photovoltaic inverter based on redundant space vectors is *** changes of photovoltaic inverter space vector are analyzed before and after the fault occurs,photovoltaic inverter will maintain fault-tolerant operation by utilizing the redundant voltage space *** and experiment verify the feasibility and effectiveness of the proposed fault tolerant control method and the proposed method has a good fault tolerant performance.

关键词： photovoltaic inverter fault tolerant control three-level redundant voltage space vector

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Synchronous PI Control for Three-phase Grid-connected photovoltaic inverter

Synchronous PI Control for Three-phase Grid-connected Photov...

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2010 Chinese Control and Decision Conference

作者： Trillion Q.Zheng School of Electrical Engineering Beijing Jiaotong University

＜正＞This paper presents mathematical modeling procedure of three-phase grid-connected photovoltaic inverter. Presents synchronous PI current control strategy and the method for adjuster *** typical waveforms of grid voltage,grid current and harmonics of grid current are carried out on a 100kW photovoltaic inverter,which can provide some guidelines for engineers to analyze,design and implement.

关键词： photovoltaic inverter Grid-Connected Synchronous PI Adjuster design Feedforward control

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Research on Volt/Var Control of Distribution Networks Based on PPO Algorithm

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Computer Modeling in Engineering & Sciences 2023年第1期134卷 599-609页

作者： Chao Zhu Lei Wang Dai Pan Zifei Wang Tao Wang Licheng Wang Chengjin Ye State Grid Zhejiang Economic and Technological Research Institute Hangzhou310008China College of Information Engineering Zhejiang University of TechnologyHangzhou310023China College of Electrical Engineering Zhejiang UniversityHangzhou310058China

In this paper,a model free volt/var control(VVC)algorithm is developed by using deep reinforcement learning(DRL).We transform the VVC problem of distribution networks into the network framework of PPO algorithm,in order to avoid directly solving a large-scale nonlinear optimization *** select photovoltaic inverters as agents to adjust system voltage in a distribution network,taking the reactive power output of inverters as action *** appropriate reward function is designed to guide the interaction between photovoltaic inverters and the distribution network *** is used to output system node voltage and network *** method realizes the goal of optimal VVC in distribution *** IEEE 13-bus three phase unbalanced distribution system is used to verify the effectiveness of the proposed *** results demonstrate that the proposed method has excellent performance in voltage and reactive power regulation of a distribution network.

关键词： Deep reinforcement learning voltage regulation unbalance distribution systems high photovoltaic permeability photovoltaic inverter volt/var control

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The Model of inverter Filter Circuit and Its Resonant Characteristics Analysis Considering Effects of Power Grid Impedance 36

The Model of Inverter Filter Circuit and Its Resonant Charac...

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第36届中国控制会议

作者： Wenjin Wu Jianhui Su Jianguo Wang Jidong Lai Shanhe Jiang School of electrical engineering and automation Hefei University of Technology School of Physics and Electrical Engineering of Anqing Normal University

ISBN: (纸本)9781538629185

The photovoltaic grid-connected power system filter interface circuit analysis and optimization design is the important measure to improve the system stability and grid power *** paper analyzes the three-phase LCL filter interface circuit model respectively on ABC coordinates and αβ *** frequency characteristic of L,LC,LCL three kinds of filter carries out comparative *** mechanism is analyzed about that the frequency characteristic of the LCL filter circuit is how to change under the different harmonic excitation *** the MATLAB the simulation model of the photovoltaic grid-connected power system is constructed,and the simulation results show that the proposed analysis method is effective.

关键词： photovoltaic inverter grid-connected filter interface circuit frequency characteristics the harmonic resonant characteristics

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