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首页> 外文期刊>Industrial Electronics, IEEE Transactions on >Hybrid Energy Storage System Microgrids Integration for Power Quality Improvement Using Four-Leg Three-Level NPC Inverter and Second-Order Sliding Mode Control
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Hybrid Energy Storage System Microgrids Integration for Power Quality Improvement Using Four-Leg Three-Level NPC Inverter and Second-Order Sliding Mode Control

机译：混合储能系统微电网集成，可通过四腿三电平NPC逆变器和二阶滑模控制来提高电能质量

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摘要

Rising demand for distributed generation based on renewable energy sources (RES) has led to several issues in the operation of utility grids. The microgrid is a promising solution to solve these problems. A dedicated energy storage system could contribute to a better integration of RES into the microgrid by smoothing the renewable resource's intermittency, improving the quality of the injected power and enabling additional services like voltage and frequency regulation. However, due to energy/power technological limitations, it is often necessary to use hybrid energy storage systems (HESS). In this paper, a second-order sliding mode controller is proposed for the power flow control of a HESS, using a four-leg three-level neutral-point-clamped (4-Leg 3L-NPC) inverter as the only interface between the RES/HESS and the microgrid. A 3-D space vector modulation and a sequence-decomposition-based ac-side control allow the inverter to work in unbalanced load conditions while maintaining a balanced ac voltage at the point of common coupling. DC current harmonics caused by unbalanced load and the NPC floating middle point voltage, together with the power division limits, are carefully addressed in this paper. The effectiveness of the proposed technique for the HESS power flow control is compared to a classical PI control scheme and is proven through simulations and experimentally using a 4-Leg 3L-NPC prototype on a test bench.
机译：对基于可再生能源（RES）的分布式发电的需求不断增长，导致了公用电网运行中的若干问题。微电网是解决这些问题的有前途的解决方案。专用的能量存储系统可以通过平滑可再生资源的间歇性，改善注入功率的质量并启用电压和频率调节等其他服务，来将RES更好地集成到微电网中。但是，由于能源技术的局限性，通常有必要使用混合储能系统（HESS）。本文提出了一种用于HESS功率流控制的二阶滑模控制器，该控制器使用四脚三电平中性点钳位（4-Leg 3L-NPC）逆变器作为HESS的唯一接口。 RES / HESS和微电网。 3-D空间矢量调制和基于序列分解的交流侧控制使逆变器可以在不平衡负载条件下工作，同时在公共耦合点保持平衡的交流电压。本文仔细研究了由不平衡负载和NPC浮动中点电压引起的直流电流谐波，以及功率分配限制。将所提出的用于HESS功率流控制的技术的有效性与经典的PI控制方案进行了比较，并通过仿真和在试验台上使用4腿3L-NPC原型进行了实验证明。

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