Eliminating Ground Current in a Transformerless Photovoltaic Application

被引：323

作者：

Lopez, Oscar ^{[1
]}

Freijedo, Francisco D. ^{[1
]}

Yepes, Alejandro G. ^{[1
]}

Fernandez-Comesana, Pablo ^{[1
]}

Malvar, Jano ^{[1
]}

Teodorescu, Remus ^{[2
]}

Doval-Gandoy, Jesus ^{[1
]}

机构：

[1] Univ Vigo, Dept Elect Technol, Vigo 36310, Spain

[2] Aalborg Univ, Inst Energy Technol, DK-9220 Aalborg, Denmark

来源：

IEEE TRANSACTIONS ON ENERGY CONVERSION | 2010年 / 25卷 / 01期

关键词：

Ground current; photovoltaic (PV) power systems; pulsewidth-modulated inverters; single-phase system; utility interface; PV POWER INJECTION; CONVERTERS; INVERTERS; SYSTEM;

D O I：

10.1109/TEC.2009.2037810

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

For low-power grid-connected applications, a single-phase converter can be used. In photovoltaic (PV) applications, it is possible to remove the transformer in the inverter to reduce losses, costs, and size. Galvanic connection of the grid and the dc sources in transformerless systems can introduce additional ground currents due to the ground parasitic capacitance. These currents increase conducted and radiated electromagnetic emissions, harmonics injected in the utility grid, and losses. Amplitude and spectrum of the ground current depend on the converter topology, the switching strategy, and the resonant circuit formed by the ground capacitance, the converter, the ac filter, and the grid. In this paper, the ground current in a 1.5-kW PV installation is measured under different conditions and used to build a simulation model. The installation includes a string of 16 PV panel, a full-bridge inverter, and an LCL filter. This model allows the study of the influence of the harmonics injected by the inverter on the ground current.

引用

页码：140 / 147

页数：8

共 21 条

[11] Transformerless photovoltaic inverters connected to the grid [J].