提高微电网电能质量的四线有源并联滤波器

A. Mostefa, Karim Belalia, Tayeb Lantri, H. M. Boulouiha, A. Allali
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引用次数: 0

摘要

近年来,电能质量已成为电网管理者关注的主要问题。有源滤波控制方案确保改善电网的电能质量,并且能够在连接点处保持期望的电压电平,而与非线性负载吸收的电流无关。谐波会导致变压器振动、设备变形、损耗和出汗。这项工作的主要目标是提高微电网的能源质量,该微电网由100kW光伏(PV)系统和连接到非线性和不平衡负载的50kW电池组组成。本文提出了一种带有比例积分(PI)控制器的四臂并联有源滤波器,以缓解微电网中的谐波问题。此外,还设计了一种算法来消除中性电流。识别函数是提取谐波的最特殊的方法之一,它涉及提供有源滤波器施加的电流参考,以便执行滤波操作。电流谐波补偿的性能和质量在很大程度上取决于产生电流参考所采用的策略。在这项工作中,选择了瞬时功率策略p-q,该策略在实现中具有突出的简单性和有效性。所提出的控制策略已经在仿真中进行了测试,结果表明,在非线性负载的高度不平衡条件下,参考信号的跟踪效果良好,总谐波失真(THD)水平显著降低。根据IEEE-519标准的建议,应用四臂滤波器后,电流THD从滤波前的43.64降低到3.74%(THD小于5%)。
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A four-line active shunt filter to enhance the power quality in a microgrid
In recent years, power quality has become a major concern for electric network managers. Active filtering control schemes ensure improved power quality of the electric network and are able to maintain a desired voltage level at the point of connection, regardless of the current absorbed by nonlinear loads. Harmonics can cause vibrations, equipment distortion, losses and sweatiness in transformers. The main objective of this work is to enhance the quality of energy in a microgrid consisting of 100 kW photovoltaic (PV) system and a 50 kW battery storage connected to nonlinear and unbalanced loads. This paper proposes a the four-arm parallel active filter with a on Proportional-Integral (PI) controller to mitigate the harmonic problems in a microgrid. In addition, an algorithm has been designed to eliminate the neutral current. The identification function is one of the most particular approach for extracting harmonics, it involves providing a current reference imposed by the active filter in order to carry out the filtering operation. Both the performance and the quality of the current harmonic compensation's depend strongly on the strategy adopted for the generating the current reference. In this work, the instantaneous power strategy p-q is chosen outstanding the simplicity and effectiveness in implementation. The proposed control strategy has been tested under simulations and the results have shown good tracking of the references and a significant reduction in the Total Harmonic Distorsion (THD) level under highly unbalanced conditions of the nonlinear loads. The current THD is reduced from 43.64 before filtering to 3.74% after the application of the four-arm filter, following the recommendations of IEEE-519 standard (THD less than 5%).
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CiteScore
4.50
自引率
16.00%
发文量
83
审稿时长
8 weeks
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