| 两级式光伏系统的低电压穿越控制技术 |
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| 引用本文： | 程永乐,王 冰,周建良.两级式光伏系统的低电压穿越控制技术[J].科学技术与工程,2014,14(1). |
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| 作者姓名： | 程永乐 王 冰 周建良 |
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| 作者单位： | 河海大学 能源与电气学院,河海大学 能源与电气学院,河海大学 能源与电气学院 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 针对光伏系统在电网电压跌落时可能产生过流、过压的情况,在传统双闭环控制策略的基础上,采用无功控制与Crowbar电路相结合的方法对光伏系统进行控制,使系统具有低电压穿越的能力。采用有功、无功电流协调分配的无功控制,不但能够解决电网电压发生跌落时的过流问题,而且能够根据电网电压跌落幅值,利用光伏电站自身的无功补偿特性向电网提供一定的无功功率;Crowbar保护电路则能够保证直流侧电压在安全范围内。最后通过仿真验证了该方法的正确性和有效性。
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| 关 键 词： | 无功控制 Crowbar 电压跌落 低电压穿越 无功补偿 |
| 收稿时间： | 7/9/2013 12:00:00 AM |
| 修稿时间： | 2013/8/28 0:00:00 |
Low Voltage Ride Through Control Strategy for Double-Stage Photovoltaic System |
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| CHENG Yong-le,WANG Bing and ZHOU Jian-liang.Low Voltage Ride Through Control Strategy for Double-Stage Photovoltaic System[J].Science Technology and Engineering,2014,14(1). |
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| Authors: | CHENG Yong-le WANG Bing and ZHOU Jian-liang |
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| Institution: | College of Energy and Electrical Engineering,Hohai University,College of Energy and Electrical Engineering,Hohai University |
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| Abstract: | The Photovoltaic (PV) system may produce overcurrent, overvoltage when grid voltage drop occurs. To deal with the problem, based on the traditionalSdouble-loop control strategy, the article proposes the method of combining reactive power control withSCrowbar circuit, which can improve the capability of low voltage ride through (LVRT). Through coordinating the active current and the reactive current, the method can solve the overcurrent problem. At the same time, by using the reactive compensation of photovoltaic power plant, the method provides reactive power to grid based on the amplitude of grid voltage drops. Finally, the simulation results show the correctness and effectiveness of the control strategy. |
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| Keywords: | reactive power control Crowbar grid voltage drops LVRT reactive compensation |
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