| 引用本文: | 黄骏翅,曾江,杨林,黄仲龙.低压微网逆变器自适应谐波下垂控制策略[J].电力自动化设备,2018,(5): |
| HUANG Junchi,ZENG Jiang,YANG Lin,HUANG Zhonglong.Adaptive harmonic droop control strategy of low-voltage microgrid inverter[J].Electric Power Automation Equipment,2018,(5): |
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| 摘要: |
| 在多个分布式电源逆变器并联于同一公共连接点(PCC)的典型低压微网中，针对各并联逆变器在无通信线情况下难以协调抑制PCC处谐波电压的问题，提出了低压微网逆变器自适应谐波下垂控制策略。将基波鲁棒性下垂控制的思想引入谐波控制，建立和分析了鲁棒性谐波下垂控制的控制框图，并根据鲁棒性下垂控制应用至谐波控制额定工况的特殊性，对其进行简化设计；在此基础上，设计了基于PCC处谐波电压检测的下垂系数自适应调节策略和多准比例谐振(PR)电流跟踪方案。通过PSCAD仿真软件构造了2台逆变器并联运行工况对所提策略进行验证，仿真结果表明，自适应谐波下垂控制策略能将PCC处的谐波电压抑制在设定范围内，并且能按逆变器容量分配谐波功率。搭建了2台逆变器并网运行的实验平台，进一步验证了所提策略的有效性，结果表明所提控制策略能使多台并联逆变器在无通信线和负载电流传感器的情况下，独立、自治地参与微网电能质量治理，并按各自容量抑制PCC处的谐波电压。 |
| 关键词: 低压微网 逆变器 谐波抑制 下垂控制 谐波功率 |
| DOI：10.16081/j.issn.1006-6047.2018.05.029 |
| 分类号:TM464 |
| 基金项目:国家自然科学基金资助项目(51477055,51777078) |
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| Adaptive harmonic droop control strategy of low-voltage microgrid inverter |
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HUANG Junchi, ZENG Jiang, YANG Lin, HUANG Zhonglong
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School of Electric Power, South China Unverisity of Technology, GuangZhou 510640, China
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| Abstract: |
| In the typical low-voltage microgrid with multiple distributed generation inverters connected in parallel at the same PCC(Point of Common Coupling),it's difficult to coordinately suppress the harmonic voltage of PCC without communication lines among inverters, so an adaptive harmonic droop control strategy for the inverters is proposed. The block diagram of Robust harmonic droop control is established and analyzed by introducing the idea of the fundamental Robust droop control to harmonic control, which is simplified according to the particularity of the rated condition. On this basis, the adaptive adjustment strategy of droop coefficients based on the detection of harmonic voltage of PCC and the multi quasi-PR(Proportional Resonant) current tracking scheme are designed. The parallel operation of two inverters is constructed in the PSCAD simulation software to verify the proposed strategy, and simulative results show that the adaptive harmonic droop control strategy can restrain the harmonic voltage of PCC in the given range, and allocate the harmonic power according to the capacity of each inverter. An experimental platform for grid-connected operation of two inverters is built to further verify the effectiveness of the proposed strategy, and results show that the proposed control strategy can make the inverters participate in the power quality improvement of microgrid independently and autonomously and suppress the harmonic voltage of PCC according to their capacities without communication lines and load current sensors. |
| Key words: low-voltage microgrid electric inverters harmonic suppression droop control harmonic power |
