电力系统及其自动化学报2016，Vol.28Issue(11)：111-116,6.DOI:10.3969/j.issn.1003-8930.2016.11.019
电网电压不平衡时光伏并网逆变器低电压穿越技术
Research on Low-voltage Ride-through of Grid-connected Photovoltaic Inverter Under Unbalanced Grid Voltage Conditions
王京保 1李辉 2张娟3
作者信息
- 1. 中铁第五勘察设计院集团有限公司四电设计院，北京 102600
- 2. 天津市市政工程设计研究院，天津 300051
- 3. 北京云电英纳超导电缆有限公司，北京 100176
- 折叠
摘要
Abstract
To improve the stability of power grid with photovoltaic(PV)inverter,the operational characteristics of PV in⁃verter and how to improve the ability of low-voltage ride-through(LVRT)under unbalanced grid voltage conditions are studied. This paper adopts two vector-oriented control strategies,which respectively orientate positive-sequence and negative-sequence voltages under positive-sequence and negative-sequence synchronous coordinate transforms. Consid⁃ering that the instantaneous power of the filter inductor is not zero,the calculation of instantaneous power in the bridge arm side is adopted to eliminate the fluctuating component in the active power transmission,thus the DC bus voltage can be stabilized. Considering the inverter current safety limit,the LVRT control scheme under unbalanced grid voltage conditions is given when the inverter is operating in rated power. A simulation model of grid-connected PV systems is built in Matlab/Simulink,and the simulation results show that hardware protection apparatus is not necessary and the proposed LVRT operation can be realized under unbalanced grid voltage conditions.关键词
光伏并网逆变器/电网电压不平衡/正/负序电流/瞬时功率/低电压穿越Key words
grid-connected photovoltaic(PV)inverter/unbalanced grid voltage/positive and negative current/instan-taneous power/low-voltage ride-through(LVRT)分类
信息技术与安全科学引用本文复制引用
王京保,李辉,张娟..电网电压不平衡时光伏并网逆变器低电压穿越技术[J].电力系统及其自动化学报,2016,28(11):111-116,6.
