| 逆变器在电网故障下的并网同步化技术 |
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| 引用本文： | 包其仕,庞科旺,刘影.逆变器在电网故障下的并网同步化技术[J].电测与仪表,2015,52(21). |
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| 作者姓名： | 包其仕 庞科旺 刘影 |
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| 作者单位： | 江苏科技大学电子信息学院,江苏科技大学电子信息学院,江苏科技大学电子信息学院 |
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| 摘 要： | 在大规模可再生能源并网发电场合中,电网可能会存在电压跌落、频率变化和谐波污染等故障,因此并网逆变器需要高性能的锁相(频)环技术来实现与电网良好同步,增强为电网提供频率和幅值支撑的能力。为此提出一种基于级联二阶广义积分器(SOGI)的锁频环技术。该技术通过级联二阶广义积分器和正、负序分量计算网络,快速准确地从故障电网中分离出基波正、负序分量,有效地消除了负序分量和谐波分量对获取频率信息的影响,实现频率的自适应控制。MATLAB的仿真结果表明了该技术有效可行。
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| 关 键 词： | 并网逆变器 级联二阶广义积分器 正负序分离 锁频环 |
| 收稿时间： | 2014/5/12 0:00:00 |
| 修稿时间： | 2014/5/12 0:00:00 |
Grid Synchronization Method for Power Inverters Under Polluted Grid conditions |
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| baoqishi,pangkewang and liuying.Grid Synchronization Method for Power Inverters Under Polluted Grid conditions[J].Electrical Measurement & Instrumentation,2015,52(21). |
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| Authors: | baoqishi pangkewang and liuying |
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| Affiliation: | Jiangsu University of Science and Technology,Jiangsu University of Science and Technology,Jiangsu University of Science and Technology |
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| Abstract: | There are many grid faults in large-scale renewable energy generations. Such as Voltage drop, Frequency variations and harmonic distortion, Which demands the grid-connected power inverters could properly synchronized with the grid, Supporting the grid service (voltage/ frequency)even if the grid is polluted .so the better PLL or FLL is expected to achieve it. In this paper, a frequency locked loop technology based on the cascaded second-order generalized integrators (SOGI) is analyzed, which could accurately and rapidly extract the positive and negative sequence from the polluted grid voltage and make frequency adaptive. Results show its effectiveness and feasibility. |
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| Keywords: | grid-connected inverters Cascaded SOGI positive/negative-sequence separation frequency-locked loop |
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