A Grid-tied PV Inverter with Sag-severity-independent Low-voltage Ride Through, Reactive Power Support, and Islanding Protection

作     者：Muhammad Talha Siti Rohani S.Raihan Nasrudin Abd.Rahim Muhammad Talha;Siti Rohani S.Raihan;Nasrudin Abd.Rahim

作者机构：UM Power Energy Dedicated Advanced Center(UMPEDAC)University of Malaya IEEE 

出 版 物：《Journal of Modern Power Systems and Clean Energy》 (现代电力系统与清洁能源学报（英文）)

年 卷 期：2021年第9卷第6期

页      面：1300-1311页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

基　　金：supported by the Program Research Grant UMPEDAC-2020(No. MOHE HICOE-UMPEDAC) the Ministry of Education Malaysia (No.RU003-2020, RU002-2021) the University of Malaya 

主　　题：Low-voltage ride through(LVRT) Sag maximum power point tracking(MPPT) single-phase photovoltaic(PV)inverter PV-battery system 

摘      要：This paper proposes a grid-tied photovoltaic(PV)inverter capable of low-voltage ride through(LVRT), reactive power support, and islanding protection. Unlike other LVRT inverters, the proposed inverter is independent of sag severity while maintaining the maximum power-point tracking(MPPT)under normal and faulty conditions. The addition of an energy storage buffer stage mitigates the DC-link voltage surge during sags. At the same time, the inverter injects the reactive power during back-to-back sags of variable depths. The control system of the inverter generates the appropriate reference signals for normal, LVRT, and anti-islanding modes while the MPPT continues running. The salient features of the proposed inverter are:(1) active power injection under normal grid conditions;(2)sag-depth independent LVRT with reactive power support;(3)no DC-link fluctuations;(4) continuous MPPT mode;and(5) simultaneous LVRT and anti-islanding support during a grid outage. The inverter demonstrates an uninterrupted operation and seamless transition between various operating modes. Simulations and the experimental prototype have been implemented to validate the efficacy of the proposed PV inverter.