Abstract：Overcurrent protection is widely used in 10kV distribution network. However, the integration of distributed generations makes a single-power-supply radial network become a scattered multi-source system. And the conventional overcurrent protection will not be applicable for this complex system, which reduces reliability of the network. The paper estabilished a control model of inverter-interfaced distributed generation (IIDG), and the influence of IIDG on current protection is analyzed. Under the constraint of the selectivity and sensibility of current protection, this paper aims to figure out the optimal capacity of IIDG installed in different locations without any additional equipment and change of the original overcurrent setting. The low-voltage-ride-through (LVRT) characteristic of IIDG is considered during the iterative calculation of the short-circuit calculation. The nonlinear relationship between the fault voltage at points of common coupling (PCC) and fault current provided by IIDG is also modified until the voltage converges.
邓景松, 王英民, 孙迪飞, 晏寒婷, 郑晨玲. 基于配电网电流保护约束的分布式光伏电源容量分析[J]. 电工技术学报, 2019, 34(zk2): 629-636.
Deng Jingsong, Wang Yingmin, Sun Difei, Yan Hanting, Zheng Chenling. Capacity Analysis of Distributed Photovoltaic Generation Based on Current Protection in Distribution Network. Transactions of China Electrotechnical Society, 2019, 34(zk2): 629-636.
[1] Meng Y S, Conde A, Leonowicz Z, et al.An adaptive overcurrent coordination scheme to improve relay sensitivity and overcome drawbacks due to distri- buted generation in smart grids[J]. IEEE Transactions on Industry Applications, 2017, 53(6): 5217-5228. [2] 唐金凤, 聂一雄, 武小梅, 等. 含分布式电源的配电网自适应电流保护[J]. 广东电力, 2014, 27(6): 26-30. Tang Jinfeng, Nie Yixiong, Wu Xiaomei, et al.Self-adaptive current protection of distribution net- work containing distributed generation[J]. Guangdong Electric Power, 2014, 27(6): 26-30. [3] Conti S.Analysis of distribution network protection issues in presence of dispersed generation[J]. Electric Power Systems Research, 2009, 79(1): 49-56. [4] 钟嘉庆, 叶治格, 卢志刚. 分布式发电注入容量与接入位置的优化配置分析[J]. 电力系统保护与控制, 2012, 40(7): 50-55. Zhong Jiaqing, Ye Zhige, Lu Zhigang.Analysis ofoptimal allocation of penetration level and inter- connected location of DG[J]. Power System Pro- tection and Control, 2012, 40(7): 50-55. [5] 吴立杰, 陈星莺, 徐石明, 等. 考虑电流保护可靠性的分布式电源准入容量研究[J]. 电网与清洁能源, 2015, 31(3): 35-39. Wu Lijie, Chen Xingying, Xu Shiming, et al.Calculating the maximum penetration capacity of distributed generation considering current protection[J]. Power System and Clean Energy, 2015, 31(3): 35-39. [6] El-Khattam W, Sidhu T S.Resolving the impact of distributed renewable generation on directional over current relay coordination: a case study[J]. IET Renewable Power Generation, 2009, 3(4): 415-425. [7] 王希舟, 陈鑫, 罗龙, 等. 分布式发电与配电网保护协调性研究[J]. 电力系统保护与控制, 2006, 34(3): 15-19. Wang Xizhou, Chen Xin, Luo Long, et al.Research on the coordination of distributed generation and distribution system protection[J]. Power System Pro- tection and Control, 2006, 34(3): 15-19. [8] 沈鑫, 曹敏. 分布式电源并网对于配电网的影响研究[J]. 电工技术学报, 2015, 30(增刊1): 346-351. Shen Xin, Cao Min.Research on the influence of distributed power grid for distribution network[J]. Transactions of China Electrotechnical Society, 2015, 30(S1): 346-351. [9] 肖浩, 裴玮, 邓卫, 等. 分布式电源对配电网电压的影响分析及其优化控制策略[J]. 电工技术学报, 2016, 31(增刊1): 203-213. Xiao Hao, Pei Wei, Deng Wei, et al.Analysis of the impact of distributed network voltage and its optimal control strategy[J]. Transactions of China Electro- technical Society, 2016, 31(S1): 203-213. [10] 光伏发电站接入电力系统技术规定:GB/T 19964- 2012[S]伏发电站接入电力系统技术规定:GB/T 19964- 2012[S]. 北京: 中国标准出版社, 2012. [11] 潘国清, 曾德辉, 王钢, 等. 含PQ控制逆变型分布式电源的配电网故障分析方法[J]. 中国电机工程学报, 2014, 34(4): 555-561. Pan Guoqing, Zeng Dehui, Wang Gang, et al.Fault analysison distribution network with inverter interfaced distributed generations based on PQ control strategy[J]. Proceedings of the CSEE, 2014, 34(4): 555-561. [12] 吴争荣, 王钢, 李海锋, 等. 计及逆变型分布式电源控制特性的配电网故障分析方法[J]. 电力系统自动化, 2012, 36(18): 92-96. Wu Zhengrong, Wang Gang, Li Haifeng, et al.Analysis of distribution network faults considering control characteristic of inverter type distributed power supply[J]. Automation of Electric Power Systems, 2012, 36(18): 92-96. [13] 翁国庆, 黄飞腾, 南余荣, 等. 计及分布式电源的电能质量监测点优化配置[J]. 电工技术学报, 2017, 32(13): 229-238. Weng Guoqing, Huang Feiteng, Nan Yurong, et al.Optimize allocation of power quality monitoring sites with distributed generators[J]. Transactions of China Electrotechnical Society, 2017, 32(13): 229-238. [14] 李娟, 高厚磊, 朱国防. 考虑逆变类分布式电源特性的有源配电网反时限电流差动保护[J]. 电工技术学报, 2016, 31(17): 74-83. Li Juan, Gao Houlei, Zhu Guofang.Inverse-time current differential protection in active distribution network considering characteristics of inverter- interfaced distributed generation[J]. Transactions of China Electrotechnical Society, 2016, 31(17): 74-83. [15] 熊飞, 吴俊勇, 郝亮亮, 等. 不对称电压跌落下逆变电源的多目标控制策略[J]. 电工技术学报, 2017, 32(1): 107-116. Xiong Fei, Wu Junyong, Hao Liangliang, et al.Multi-objective control strategies of grid interface inverter under unbalanced voltage sags[J]. Transa- ctions of China Electrotechnical Society, 2017, 32(1): 107-116. [16] 康忠健, 田爱娜, 冯艳艳, 等. 基于零序阻抗模型故障特征的含分布式电源配电网故障区间定位方法[J]. 电工技术学报, 2016, 31(10): 214-221. Kang Zhongjian, Tian Aina, Feng Yanyan, et al.Fault section location method based on zero sequence impedance model fault feature in distribution network with distributed generators[J]. Transactions of China Electrotechnical Society, 2016, 31(10): 214-221.
2019, Vol. 34 
