摘要
光伏发电不同于传统电源,其大容量并网发电会对光伏电站及其接入系统的安全、稳定、可靠运行带来新的挑战。在国网公司的光伏电站接入电网技术规定中,针对光伏发电低电压穿越能力也提出了要求。针对光伏变流器在低电压穿越时的动态特性,提出了直流侧DC-Chopper保护电路的控制策略。并在PSCAD/EMTDC仿真软件中搭建了双极型光伏发电系统模型,针对电网三相对称短路故障下直流侧保护电路的投切策略进行了仿真研究。仿真结果验证了所提策略能有效地实现光伏发电系统的低电压穿越。
Photovoltaic power generation＇s characteristics are different from the traditional power source, the power grid and photovoltaic power plants need to face new challenges about the system＇s security, stability and reliability. A DC-Chopper protection control strategy was proposed based on photovoltaic power generation LVRT dynamic characteristics. By PSCAD/EMTDC, the simulation module of grid-connected photovoltaic power system was set up and the dynamic stability of grid-connected photovoltaic power system connected into power grid considering LVRT was simulated. Results show that the established DC-chopper protection circuit is in favor of achieving the LVRT of grid-connected photovoltaic power system.
出处
《电源技术》
CAS
CSCD
北大核心
2013年第11期2016-2018,2034,共4页
Chinese Journal of Power Sources
基金
新疆高技术支撑计划项目(201132116)
