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Bidirectional Power Converter for Solar Grid Interface Applications: An Experimental Investigation

机译：用于太阳能电网接口应用的双向功率转换器：实验研究

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摘要

Switching control of a current controlled grid integrated inverter using three-level neutral point clamped (NPC) inverter is investigated in this paper. The proposed scheme uses both the hysteresis current control (HCC) and carrier based switching schemes to improve the low switching frequency operation. To overcome the problems associated with current control techniques a simple carrier injection method is proposed in this paper. This current control method uses a high frequency triangular carrier injected to the current tracking error. The triangular carriers are chosen with minute amplitude comparable with current tracking error. This will enhance the switching frequency and stabilize the NPC inverter. This will ensure constant switching frequency operation of the grid interface inverter (GII). A comprehensive modeling of GII is carried out to study the stability of the system. A comparative study of switching frequency stabilization is presented. To verify the proposed current controller a prototype setup is developed. Analytical studies with experimental results of the proposed techniques are presented to show the superiority of results.
机译：本文研究了采用三电平中性点钳位（NPC）逆变器的电流控制电网集成逆变器的开关控制。所提出的方案同时使用了磁滞电流控制（HCC）和基于载波的开关方案，以改善低开关频率工作。为了克服与电流控制技术有关的问题，本文提出了一种简单的载流子注入方法。该电流控制方法使用注入电流跟踪误差的高频三角载波。选择具有与电流跟踪误差相当的微小幅度的三角载波。这将提高开关频率并稳定NPC逆变器。这将确保电网接口逆变器（GII）的恒定开关频率运行。对GII进行了综合建模，以研究系统的稳定性。提出了开关频率稳定度的比较研究。为了验证提出的电流控制器，开发了原型装置。提出的技术的实验结果进行了分析研究，以显示结果的优越性。

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