Influence of Distributed Capacitance of Photovoltaic Double-split Transformer on DC Voltage of Inverter

Dapeng ZHU; Jianhui SU; Haining WANG; Jian ZHANG

doi:10.7500/AEPS20191225006

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Influence of Distributed Capacitance of Photovoltaic Double-split Transformer on DC Voltage of Inverter

Application Research | 更新时间：2025-06-16

- Influence of Distributed Capacitance of Photovoltaic Double-split Transformer on DC Voltage of Inverter
- Automation of Electric Power Systems Vol. 44, Issue 14, Pages: 141-147(2020)
- 作者机构：
  
  1. 光伏系统教育部工程研究中心(合肥工业大学)，安徽省合肥市 230009
  2. 合肥工业大学电气与自动化工程学院，安徽省合肥市 230009
- 作者简介：
- 基金信息：
  
  National Key R&D Program of China;the Basic Operating Expenses of Central Scientific Research
- DOI：10.7500/AEPS20191225006
  CLC：
- Received：25 December 2019，
  
  Revised：2020-03-21，
  
  Published Online：25 May 2020，
  
  Published：25 July 2020
- 稿件说明：
移动端阅览
朱大朋,苏建徽,汪海宁等.光伏发电双分裂变压器分布电容对逆变器直流电压的影响[J].电力系统自动化,2020,44(14):141-147.

ZHU Dapeng,SU Jianhui,WANG Haining,et al.Influence of Distributed Capacitance of Photovoltaic Double-split Transformer on DC Voltage of Inverter[J].Automation of Electric Power Systems,2020,44(14):141-147.
朱大朋,苏建徽,汪海宁等.光伏发电双分裂变压器分布电容对逆变器直流电压的影响[J].电力系统自动化,2020,44(14):141-147. DOI： 10.7500/AEPS20191225006.

ZHU Dapeng,SU Jianhui,WANG Haining,et al.Influence of Distributed Capacitance of Photovoltaic Double-split Transformer on DC Voltage of Inverter[J].Automation of Electric Power Systems,2020,44(14):141-147. DOI： 10.7500/AEPS20191225006.

摘要

兆瓦级光伏电站发电单元通常是由2台500 kW并网逆变器和1台1 MVA三相辐向双分裂升压变压器构成，而辐向升压变压器低压绕组间存在较大的分布电容，常发生2台光伏并网逆变器共同运行困难的问题。针对上述问题，对采用三相辐向升压变压器的光伏发电单元进行了等效建模，分析了变压器低压绕组间分布电容对双逆变器共同运行的影响机理。分析结果表明，并联在变压器两低压侧的2台逆变器之间存在漏电流回路

光伏发电单元中延后并网的逆变器直流母线电压升高导致双逆变器共同运行困难。通过仿真验证了机理分析的正确性。最后，提出了2种解决办法，并进行了仿真和实验验证。

Abstract

The power generation unit of megawatt-level photovoltaic power plant is usually composed of two 500 kW grid-connected inverters and one 1 MVA three-phase radial double-split boost transformer. There is a large distributed capacitance between the low-voltage windings of radial boost transformer. The two grid-connected photovoltaic inverters are often difficult to operate together. Aiming at the issue above

this paper establishes a equivalent model of photovoltaic power generation unit with three-phase radial boost transformer

and analyzes the influence mechanism of distributed capacitance between low-voltage windings of transformers on the joint operation of two inverters. The analysis result shows that there is a leakage current loop between the two inverters connected in parallel on the two low-voltage sides of the transformer

the increased DC bus voltage of the later grid-connected inverter in photovoltaic power generation units makes it difficult for two inverters to operate together. Simulation verifies the correctness of mechanism analysis. Finally

two solutions are proposed and verified by simulation and experiment.

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references

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