逆变器在电网故障下的并网同步化技术

包其仕; 庞科旺; 刘影

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):.
baoqishi,pangkewang,liuying.Grid Synchronization Method for Power Inverters Under Polluted Grid conditions[J].Electrical Measurement & Instrumentation,2015,52(21):.

逆变器在电网故障下的并网同步化技术

Grid Synchronization Method for Power Inverters Under Polluted Grid conditions

DOI：

中文关键词: 并网逆变器级联二阶广义积分器正负序分离锁频环

英文关键词:grid-connected inverters, Cascaded SOGI, positive/negative-sequence separation, frequency-locked loop

基金项目:

作者中文名	作者英文名	单位
包其仕	baoqishi	江苏科技大学电子信息学院
庞科旺	pangkewang	江苏科技大学电子信息学院
刘影	liuying	江苏科技大学电子信息学院

摘要点击次数: 1806

中文摘要:

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,因此需要采用更高性能的锁相(频)环技术实现故障情况下的电网同步,增强并网逆变器为电网提供频率和幅值支撑的能力。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精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,实现频率自适应。MATLAB的仿真结果证明了该技术的有效性和可行性。

英文摘要:

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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