| 引用本文: | 李 升,卫志农,孙国强,高 鹏,肖 佳.大规模光伏发电并网系统电压稳定分岔研究[J].电力自动化设备,2016,36(1): |
| LI Sheng,WEI Zhinong,SUN Guoqiang,GAO Peng,XIAO Jia.Voltage stability bifurcation of large-scale grid-connected PV system[J].Electric Power Automation Equipment,2016,36(1): |
|
| 摘要: |
| 运用数值分岔软件MATCONT对一个接入大规模光伏电站的经典3节点系统进行分岔分析。单参数分岔分析结果显示，系统存在着危害负荷电压稳定性的亚临界Hopf分岔。双参数分岔分析结果显示，当光伏电站以滞后功率因数运行时，系统具有最大电压稳定域光伏有功出力值，可作为光伏电站最大安装容量；而以超前功率因数运行时则会使系统的电压稳定域缩小。当光伏电站以滞后功率因数运行时，光照强度大幅度突降会对负荷电压稳定性造成不利影响，光伏电站有功出力越大，该影响越严重。对系统中的等值发电机角速度施加线性反馈控制后可延迟甚至完全消除亚临界Hopf分岔，从而可使系统以鞍结分岔点作为系统的电压稳定临界点，大幅扩大了电压稳定域；采用线性反馈控制措施还可使光照强度发生大幅度突降时负荷电压能够快速恢复。 |
| 关键词: 大规模光伏电站 并网 电压稳定 亚临界Hopf分岔 线性反馈控制 光照强度 |
| DOI： |
| 分类号: |
| 基金项目:江苏高校品牌专业建设工程资助项目（ＰＰＺＹ２０１５Ａ-０３１）；南京工程学院科研创新基金面上项目（CKJB201208）；国家级大学生实践创新训练计划项目（201311276004Z） |
|
| Voltage stability bifurcation of large-scale grid-connected PV system |
|
LI Sheng1,2, WEI Zhinong1, SUN Guoqiang1, GAO Peng2, XIAO Jia2
|
|
1.College of Energy and Electrical Engineering，Hohai University，Nanjing 211100，China;2.School of Electric Power Engineering，Nanjing Institute of Technology，Nanjing 211167，China
|
| Abstract: |
| The numerical bifurcation software MATCONT is applied in the parameter bifurcation analysis for classic 3-bus system with large-scale PV（PhotoVoltaic） power plant. The results of single-parameter bifurcation analysis show that，system has an unstable Hopf bifurcation，harmful to the load voltage stability. The results of double-parameter bifurcation analysis show that，when PV power plant operates with lagging power factor，system has PV active power output with the maximum voltage stability domain，which can be taken as the maximum PV installation capacity；when PV power plant operates with leading power factor，the system voltage stability domain becomes narrow. The sudden drop of irradiance intensity may bring adverse effect on the load voltage stability when PV power plant operates with lagging power factor；the more active power the PV power plant outputs，the more serious effect it brings. The linear feedback control of system equivalent generator angle velocity may delay and even totally eliminate the unstable Hopf bifurcation，which allows system to take the saddle-node bifurcation point as the critical point of voltage stability for the great expansion of its voltage stability domain，and also helps the quick recovery of load voltage when the irradiance intensity drops suddenly. |
| Key words: large-scale photovoltaic power plant grid-connection voltage stability unstable Hopf bifurcation linear feedback control irradiance intensity |
