Distributed PV Auxiliary Voltage Control Strategy in Low Voltage Distribution Network Based on Small AC Signals

doi:10.11930/j.issn.1004-9649.202006264

Abstract

Abstract: With the progress of China's photovoltaic industry, the capacity of distributed photovoltaic sources connected with the low-voltage distribution network is increasing. When the solar irradiance is high, the distribution network may suffer serious out-of-limit voltage. This paper analyzes the causes of out-of-limit voltage phenomenon in the distribution network, and an auxiliary voltage control strategy of distributed photovoltaic source is proposed for this problem. The purpose of the strategy is to ensure the economic benefits of each photovoltaic source while giving the best play to the voltage control ability of each photovoltaic source. The proposed control strategy reduces part of active power to control voltage based on reactive power control strategy. It uses the maximum power estimation method to realize the reduction control of active power of photovoltaic source, and realizes the communication and coordination between photovoltaic sources by injecting small AC voltage signal into the power grid. Finally, the validity of the proposed strategy is verified by case study results.

Key words: photovoltaic generation, low-voltage distribution network, out-of-limit voltage, maximum power estimation, small AC signal

YAN Xiangwu, WANG Chenguang, JIA Jiaoxin, MA Hongbin. Distributed PV Auxiliary Voltage Control Strategy in Low Voltage Distribution Network Based on Small AC Signals[J]. Electric Power, 2022, 55(5): 134-142.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202006264

https://www.electricpower.com.cn/EN/Y2022/V55/I5/134

References

[1] 白建华, 辛颂旭, 刘俊, 等. 中国实现高比例可再生能源发展路径研究[J]. 中国电机工程学报, 2015, 35(14): 3699–3705
BAI Jianhua, XIN Songxu, LIU Jun, et al. Roadmap of realizing the high penetration renewable energy in China[J]. Proceedings of the CSEE, 2015, 35(14): 3699–3705
[2] 江华, 金艳梅, 叶幸, 等. 中国光伏产业2019年回顾与2020年展望[J]. 太阳能, 2020(3): 14–23
JIANG Hua, JIN Yanmei, YE Xing, et al. Review of China's pv industry in 2019 and prospect in 2020[J]. Solar Energy, 2020(3): 14–23
[3] 陈炜, 艾欣, 吴涛, 等. 光伏并网发电系统对电网的影响研究综述[J]. 电力自动化设备, 2013, 33(2): 26–32,39
CHEN Wei, AI Xin, WU Tao, et al. Influence of grid-connected photovoltaic system on power network[J]. Electric Power Automation Equipment, 2013, 33(2): 26–32,39
[4] 蔡永翔, 唐巍, 徐鸥洋, 等. 含高比例户用光伏的低压配电网电压控制研究综述[J]. 电网技术, 2018, 42(1): 220–229
CAI Yongxiang, TANG Wei, XU Ouyang, et al. Review of voltage control research in LV distribution network with high proportion of residential PVs[J]. Power System Technology, 2018, 42(1): 220–229
[5] SHAYANI R A, DE OLIVEIRA M A G. Photovoltaic generation penetration limits in radial distribution systems[J]. IEEE Transactions on Power Systems, 2011, 26(3): 1625–1631.
[6] 许晓艳, 黄越辉, 刘纯, 等. 分布式光伏发电对配电网电压的影响及电压越限的解决方案[J]. 电网技术, 2010, 34(10): 140–146
XU Xiaoyan, HUANG Yuehui, LIU Chun, et al. Influence of distributed photovoltaic generation on voltage in distribution network and solution of voltage beyond limits[J]. Power System Technology, 2010, 34(10): 140–146
[7] 张勇军, 张锶恒, 刘斯亮, 等. 考虑分布式光伏与储能接入的配变双层规划[J]. 电力系统保护与控制, 2020, 48(24): 9–15
ZHANG Yongjun, ZHANG Siheng, LIU Siliang, et al. Dual planning of a distribution transformer considering the impact of distributed photovoltaics and energy storage access[J]. Power System Protection and Control, 2020, 48(24): 9–15
[8] SAMADI A, ERIKSSON R, S?DER L, et al. Coordinated active power-dependent voltage regulation in distribution grids with PV systems[J]. IEEE Transactions on Power Delivery, 2014, 29(3): 1454–1464.
[9] PUKHREM S, BASU M, CONLON M F, et al. Enhanced network voltage management techniques under the proliferation of rooftop solar PV installation in low-voltage distribution network[J]. IEEE Journal of Emerging and Selected Topics in Power Electronics, 2017, 5(2): 681–694.
[10] 张健, 李天慧, 马刚, 等. 基于智能负载的光伏并网电压和频率稳定方法研究[J]. 智慧电力, 2020, 48(10): 52–57
ZHANG Jian, LI Tianhui, MA Gang, et al. Voltage and frequency stabilization method for grid-connected photovoltaic system based on smart load[J]. Smart Power, 2020, 48(10): 52–57
[11] GHOSH S, RAHMAN S, PIPATTANASOMPORN M. Distribution voltage regulation through active power curtailment with PV inverters and solar generation forecasts[J]. IEEE Transactions on Sustainable Energy, 2017, 8(1): 13–22.
[12] TONKOSKI R, LOPES L A C, EL-FOULY T H M. Coordinated active power curtailment of grid connected PV inverters for overvoltage prevention[J]. IEEE Transactions on Sustainable Energy, 2011, 2(2): 139–147.
[13] 高鹏程, 王蕾, 李立生, 等. 基于光伏逆变器调节的配电网电压控制策略[J]. 电力自动化设备, 2019, 39(4): 190–196
GAO Pengcheng, WANG Lei, LI Lisheng, et al. Voltage control strategy based on adjustment of PV inverters in distribution network[J]. Electric Power Automation Equipment, 2019, 39(4): 190–196
[14] 李清然, 张建成. 含分布式光伏电源的配电网电压越限解决方案[J]. 电力系统自动化, 2015, 39(22): 117–123
LI Qingran, ZHANG Jiancheng. Solutions of voltage beyond limits in distribution network with distributed photovoltaic generators[J]. Automation of Electric Power Systems, 2015, 39(22): 117–123
[15] 蔡永翔, 张璐, 唐巍, 等. 考虑逆变器无功充裕性的含高比例户用光伏低压配电网电压控制策略[J]. 电网技术, 2017, 41(9): 2799–2808
CAI Yongxiang, ZHANG Lu, TANG Wei, et al. A voltage control strategy for LV distribution network with high proportion residential PVs considering reactive power adequacy of PV inverters[J]. Power System Technology, 2017, 41(9): 2799–2808
[16] 刘嘉彦, 李勇, 曹一家, 等. 考虑光伏利用效率的中低压配电网电压抬升抑制方法[J]. 电力系统自动化, 2018, 42(15): 171–177
LIU Jiayan, LI Yong, CAO Yijia, et al. Suppression method of voltage rise in medium and low distribution networks considering utilization efficiency of photovoltaic power[J]. Automation of Electric Power Systems, 2018, 42(15): 171–177
[17] 魏昊焜, 刘健, 高慧. 分布式电源的本地电压控制策略[J]. 电力自动化设备, 2016, 36(9): 40–45
WEI Haokun, LIU Jian, GAO Hui. Local voltage control of distributed generations[J]. Electric Power Automation Equipment, 2016, 36(9): 40–45
[18] HOKE A, MULJADI E, MAKSIMOVIC D. Real-time photovoltaic plant maximum power point estimation for use in grid frequency stabilization[C]//2015 IEEE 16 th Workshop on Control and Modeling for Power Electronics. Vancouver, BC, Canada. IEEE, 2015: 1–7.
[19] 徐放, 钟诚, 王昱博. 基于实时最大功率估计的光伏系统参与电网调频的控制策略[J]. 广东电力, 2019, 32(6): 1–8
XU Fang, ZHONG Cheng, WANG Yubo. Control strategy for photovoltaic system participating in power grid frequency modulation based on real-time maximum power estimation[J]. Guangdong Electric Power, 2019, 32(6): 1–8
[20] 吴鸣, 于辉, 熊雄. 分布式电源接入配电网的基本原则[J]. 供用电, 2017, 34(12): 32–38
WU Ming, YU Hui, XIONG Xiong. Basic principles for integration of distributed generation into power distribution network[J]. Distribution & Utilization, 2017, 34(12): 32–38
[21] 武腾, 刘增, 刘进军, 等. 基于小交流信号下垂的微网二次控制方法[J]. 电源学报, 2018, 16(3): 62–69
WU Teng, LIU Zeng, LIU Jinjun, et al. Small AC signal droop based secondary control method for microgrid[J]. Journal of Power Supply, 2018, 16(3): 62–69