Control of grid-tied photovoltaic systems with neutral point clamped inverters

2017 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA) Pub Date : 2017-05-01 DOI:10.1109/PEPQA.2017.7981654

F. Osorio, Diego F. Motta, Maria A. Mantilla, J. G. Barrero, J. Petit

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Abstract

This paper presents the operation of a grid-tied photovoltaic power generator considering a two stages configuration for active power injection. A Neutral Point Clamped Inverter (NPC Inverter) was used for the DC-AC conversion and a DC-DC Boost converter complemented the system configuration. The control system includes the following loops: a maximum power point tracking algorithm, a DC bus voltage control, a reference generator, a capacitors voltage balancing loop, a current controller and a Level Shifted Pulse Width Modulation (LS-PWM) technique. The work is mainly focused in balancing the voltages in the DC bus capacitors by adding an offset level to the modulation signal which ensures the good performance of the NPC inverter. The operation of the system was evaluated in a PSIM® software environment for different irradiance conditions. The results show the outstanding performance of the photovoltaic system specifically in the Maximum Power Point Tracking (MPPT), the DC side voltages balance in the NPC inverter and the active power control.

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中性点箝位逆变器并网光伏系统控制

本文介绍了并网光伏发电机组在两级有功注入配置下的运行情况。中性点箝位逆变器(NPC逆变器)用于DC-AC转换，DC-DC升压转换器补充了系统配置。该控制系统包括以下环路:最大功率点跟踪算法、直流母线电压控制、参考发生器、电容器电压平衡回路、电流控制器和电平移位脉宽调制(LS-PWM)技术。该工作主要是通过在调制信号中增加一个失调电平来平衡直流母线电容中的电压，从而保证NPC逆变器的良好性能。在PSIM®软件环境中评估了系统在不同辐照度条件下的运行情况。结果表明，该光伏系统在最大功率点跟踪(MPPT)、NPC逆变器直流侧电压平衡和有功功率控制方面表现优异。

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2017 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA)

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