| 引用本文: | 刘耀远,曾成碧,李庭敏,付文雯.基于超级电容的光伏并网低电压穿越控制策略研究[J].电力系统保护与控制,2014,42(13):77-82.[点击复制] |
| LIU Yao-yuan,ZENG Cheng-bi,LI Ting-min,FU Wen-wen.Study on low-voltage ride through control strategy of photovoltaic system based on super-capacitor[J].Power System Protection and Control,2014,42(13):77-82[点击复制] |
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| 摘要: |
| 针对光伏系统在电网扰动或故障时突然脱网给电网带来严重后果，对基于超级电容的光伏并网系统的低电压穿越控制策略进行研究。在电网电压跌落时，通过控制超级电容吸收有功功率，平衡直流母线电压，减少光伏阵列注入逆变器的功率，防止逆变器过流。同时保证了逆变器的无功电流输出能力，支撑电网电压，实现系统的低电压穿越。利用系统仿真模型进行验证，结果表明该方法提高了光伏并网的低电压穿越能力，在保证光伏系统安全运行的同时，大大提高了无功支撑能力，稳定了电网电压，利于故障恢复。 |
| 关键词: 光伏系统 两级式并网 低电压穿越 超级电容 无功支撑 |
| DOI： |
| 投稿时间：2013-09-12修订日期：2013-11-12 |
| 基金项目:四川省科技支撑项目（2014GZ0069）；四川省教育厅自然科学项目（13ZA0096） |
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| Study on low-voltage ride through control strategy of photovoltaic system based on super-capacitor |
| LIU Yao-yuan,ZENG Cheng-bi,LI Ting-min,FU Wen-wen |
| (School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, China;Liangshan Power Supply Company, Sichuan Electric Power Company, Xichang 615050, China) |
| Abstract: |
| To avoid serious consequences caused by photovoltaic system suddenly loss connection from the power grid when power grid disturbances or malfunctions happened, this paper researches LVRT control strategy of super-capacitor-based photovoltaic systems. When the grid voltage drops, the super capacitor is used to absorb the active power, balance DC bus voltage, and reduce the power injected into the inverter to prevent the inverter overcurrent. Simulation results show that this method greatly improves the photovoltaic system's low voltage ride through capability, ensures the safe operation of the PV inverter, meanwhile provides reactive power support to stabilize voltage of power grid, and is conducive to failure recovery. |
| Key words: PV systems double-stage grid-connected LVRT super-capacitor reactive power support |
