| 引用本文: | 袁继敏,李小玲,魏建国,曹太强.光伏发电系统软开关并网研究[J].电力自动化设备,2010,(9): |
| YUAN Jimin,LI Xiaoling,WEI Jianguo,CAO Taiqiang.Soft-switching technology of grid-connected photovoltaic system[J].Electric Power Automation Equipment,2010,(9): |
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| 摘要: |
| 针对传统硬开关并网瞬间产生冲击电流且并网时间过长等问题，提出使用双向晶闸管（TRIAC）并网的控制策略。其工作原理是：当控制器检测到光伏逆变器输出的交流电压与电网电压同频、同相时，对光伏逆变器输出的交流电压和电网电压分别采样并进行有效值的差值运算，当二者的有效值幅度差近似为零时，立即给TRIAC以触发电压并使其导通，使光伏系统的电能输送给电网，达到并网的目的。通过理论分析和仿真验证了该方法的正确性和控制的有效性。 |
| 关键词: 软开关 并网 光伏系统 功率传输 双向晶闸管 |
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| Soft-switching technology of grid-connected photovoltaic system |
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YUAN Jimin,LI Xiaoling,WEI Jianguo,CAO Taiqiang
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1.School of Computer Science & Technology，Panzhihua University，Panzhihua 617000，China;2.Sichuan Shengtang Co.，Ltd.，Chengdu 610106，China
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| Abstract: |
| Aiming at the surge current and long paralleling time of conventional grid-connection by hard switching，the control strategy of grid-connection with TRIAC is proposed. The working principle is as followings：when the output AC voltage of photovoltaic inverter and the power grid voltage，which are detected by the controller，have the same frequency and phase，they are then sampled respectively for RMS calculation；when their difference is near zero，the TRIAC is then triggered on to connect the photovoltaic system to power grid. Its correctness and effectiveness are verified by the theoretical analysis and simulations. |
| Key words: soft-switching paralleling photovoltaic system power transmission TRIAC |
