低成本和紧的六开关七级电网绑定无变压器的光伏逆变器
N P Gopinath1, R Azhagumurugan2, M Jagabar Sathik3
1Department of Electrical and Electronics Engineering, St. Joseph's Institute of Technology, Chennai, India.
Scientific reports
|March 15, 2025
概括
连接到电网的太阳能光伏 (PV) 系统的新六开关,七级逆变器拓有效地抑制了泄漏电流. 这种无变压器逆变器提高了效率,降低了成本,同时满足IEEE-519标准.
科学领域:
- 电气工程 电气工程
- 电力电子 电力电子 电力电子
- 可再生能源系统可再生能源系统
背景情况:
- 无变压器逆变器对于联网光伏 (PV) 系统至关重要,原因是效率和成本优势.
- 对于抑制这些系统中的泄漏电流来说,一般地面结构是首选的.
- 现有的拓在平衡开关数量,电压水平和效率方面面临挑战.
研究的目的:
- 为了引入一个新的六开关,七级 (S2-7L) 常用地面无变压器逆变器拓.
- 为了证明拓在抑制电网太阳能光伏应用的泄漏电流方面的有效性.
- 评估性能,并将其与现有的七级逆变器拓进行比较.
主要方法:
- 开发S2-7L通用地面逆变器拓.
- 操作模式的分析和被动元件和波器电感器的设计.
- 使用MATLAB/Simulink进行模拟,并使用825W原型进行实验验证.
主要成果:
- 拟议的S2-7L拓产生的七级输出电压只有六个开关.
- 它通过保持恒定的常态电压来有效地抑制泄漏电流.
- FFT的分析证实电压THD为17.2%,电网电流THD为3.9%,符合IEEE-519标准.
结论:
- S2-7L通用地面逆变器拓为连接到电网的光伏系统提供了卓越的解决方案.
- 它实现了高效率,降低成本和有效的泄漏电流抑制.
- 与现有解决方案相比,该拓在开关数量和总静电压方面具有优势.
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