基于混合型算法的光伏发电系统低电压穿越控制策略

doi:10.11930/j.issn.1004-9649.201911060

中国电力 ›› 2020, Vol. 53 ›› Issue (3): 18-27,58.DOI: 10.11930/j.issn.1004-9649.201911060

• 新能源电力系统源网荷储协调运行技术专栏 • 上一篇下一篇

基于混合型算法的光伏发电系统低电压穿越控制策略

杨春波¹, 王晶晶², 康鹏², 曾琳枫², 郑峰³

1. 国网安徽省电力有限公司池州供电公司, 安徽池州 230061;
2. 国网节能服务有限公司, 北京 100052;
3. 福州大学电气工程自动化学院, 福建福州 350116

收稿日期:2019-11-12 修回日期:2019-12-12 发布日期:2020-03-10
通讯作者: 郑峰(1983-),男,通信作者,博士,讲师,从事分布式电源故障穿越技术研究,E-mail:zf_whu@163.com
作者简介:杨春波(1976-),男,硕士,高级工程师,从事电网运营、安全生产、供电服务研究,E-mail:chboyang@sohu.com;王晶晶(1992-),女,硕士,工程师,从事电网运营、安全生产及供电服务研究,E-mail:15210891806@163.com;康鹏(1982-),男,博士,高级工程师,从事综合能源、电网节能改造技术,E-mail:kangpeng19821125@163.com;曾琳枫(1992-),男,硕士,工程师,从事电网节能改造及综合能源服务,E-mail:18810494203@163.com
基金资助:
国网节能公司科技项目（52789918000F）

Research on LVRT Control Strategy of Photovoltaic System Based on Hybrid Control Algorithm

YANG Chunbo¹, WANG Jingjing², KANG Peng², ZENG Linfeng², ZHENG Feng³

1. State grid Chizhou Power Supply Company, Chizhou 230061, China;
2. State Grid Energy Saving Service Co., Ltd., Beijing 100052, China;
3. School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350116, China

Received:2019-11-12 Revised:2019-12-12 Published:2020-03-10
Supported by:
This work is supported by Science and Technology Project of State Grid Energy Saving Service Co., Ltd. (No.52789918000F)

摘要/Abstract

摘要： 针对两级光伏发电系统在电网电压跌落时，易出现并网逆变器直流侧过电压和交流侧过电流的问题，提出一种基于混合型算法的光伏发电系统低电压穿越（low voltage ride through，LVRT）控制策略。首先，该策略通过模型电流预测控制，使逆变器并网电流在对称与不对称故障情况下均可快速跟随参考指令，且输出设定的对称电流，解决交流侧过电流问题。其次，基于并网点（point of common coupling，PCC）电压的跌落程度及自适应非最大功率跟踪（non maximum power point tracking，Non-MPPT）算法，调节前级Boost变换器占空比，进而降低光伏阵列输出功率，抑制故障过程中并网逆变器交、直两侧功率失衡而导致的直流侧母线过电压，并通过引入直流电压反馈项，消除不对称故障时直流电压二次谐波分量。最后，通过Matlab/Simulink仿真系统，验证所提控制算法的正确性与有效性。

关键词: 两级光伏发电系统, 混合型算法, 模型电流预测控制, Non-MPPT算法, 低电压穿越

Abstract: A low voltage ride-through (LVRT) control strategy of photovoltaic (PV) system based on a hybrid control algorithm is proposed to solve the problems of DC-link overvoltage and AC side overcurrent of grid-connected inverter when the power grid voltage drops. Firstly, based on model current prediction control, the inverter grid-connected current can quickly follow the reference instruction and the symmetrical current can be always obtained to solve AC side overcurrent problem in the case of symmetric and asymmetric faults. Secondly, based on the voltage sag of the point of common coupling (PCC) and the adaptive non maximum power point tracking (Non-MPPT) algorithm to adjust Boost converter's duty ratio, the output power of PV array can be reduced, so that DC-link overvoltage can be inhibited in the failure process which is caused by the power imbalance between AC and DC side of the grid-connected inverter. By introducing DC-link voltage feedback, the second harmonic component of DC-link voltage can be removed in the asymmetric fault condition. Finally, the correctness and effectiveness of algorithm proposed are verified by Matlab/Simulink simulation system.

Key words: two-stage PV power generation system, hybrid algorithm, model current prediction control, Non-MPPT algorithm, LVRT

杨春波, 王晶晶, 康鹏, 曾琳枫, 郑峰. 基于混合型算法的光伏发电系统低电压穿越控制策略[J]. 中国电力, 2020, 53(3): 18-27,58.

YANG Chunbo, WANG Jingjing, KANG Peng, ZENG Linfeng, ZHENG Feng. Research on LVRT Control Strategy of Photovoltaic System Based on Hybrid Control Algorithm[J]. Electric Power, 2020, 53(3): 18-27,58.

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基于混合型算法的光伏发电系统低电压穿越控制策略

Research on LVRT Control Strategy of Photovoltaic System Based on Hybrid Control Algorithm

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基于混合型算法的光伏发电系统低电压穿越控制策略

Research on LVRT Control Strategy of Photovoltaic System Based on Hybrid Control Algorithm

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