电工技术学报  2017, Vol. 32 Issue (9): 189-198    DOI:
电力系统及其自动化 |
大型光伏电站汇集系统的故障特性及其线路保护
贾科, 顾晨杰, 毕天姝, 魏宏升, 杨奇
逊(新能源电力系统国家重点实验室(华北电力大学) 北京 102206
Fault Characteristics and Line Protection within the Collection System of a Large-Scale Photovoltaic Power Plant
Jia Ke, Gu Chenjie, Bi Tianshu, Wei Hongsheng, Yang Qixun
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing 102206 China
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摘要 集中式与分布式光伏系统在拓扑和控制上的显著区别,造成两者故障特性的不同,导致现有含分布式光伏的配电网故障分析方法和保护原理在集中式光伏电站汇集系统中无法适用。为此,针对广泛应用于集中式光伏逆变器中的正负序双同步旋转坐标系电流控制器,计及直流侧光伏电池板电源特性影响,推导出不同控制目标下故障电流统一表达式。在此基础上,结合现场短路试验数据,考察850 MW大型光伏电站内35 kV汇集线路的电流保护性能,证明架空线下游电流保护存在不能正确动作现象,同时提出距离保护新配置方案。在PSCAD/EMTDC中搭建光伏电磁暂态详细模型并利用现场实测数据验证了模型的正确性,大量仿真实例证明了新保护配置的有效性。研究结果为大型光伏电站汇集系统保护配置提供参考。
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贾科
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杨奇
关键词 大型光伏电站控制目标故障电流保护配置    
Abstract:Centralized photovoltaic(PV)systems have different fault behaviors from distributed PV systems due to the differences in the structure and controls.This makes fault analysis and protection methods in distribution networks with distributed PV not suitable for centralized PV plants.Therefore,the widely-used current controllers under the double synchronous rotating frame(DSRF)are considered,as well as the characteristics of PV arrays,and then a consolidated expression for the fault current is calculated under different controls.Based on the analyzed fault current characteristics and the on-site short test data,the performance of current protection relays on 35 kV collection lines is evaluated within an 850 MW large-scale PV plant.The evaluation revealed that the overcurrent relays at the downstream side on overhead lines might malfunction and thus a new relay scheme is proposed using distance elements.In the PSCAD/EMTDC,an electromagnetic PV transient model in detail is built and verified using the on-site test data.Finally,considerable simulation results verified the proposed relay scheme.The research in this paper can help improve the protection performance within PV plants.
Key wordsLarge-scale photovoltaic plant    control scheme    fault current    protection scheme   
收稿日期: 2016-04-06      出版日期: 2017-05-12
PACS: TM615  
基金资助:国家重点研发计划(2016YFB0900203)、国家自然科学基金项目(51407067)和中央高校基本科研业务费专项资金(2016ZZD01)资助
通讯作者: 贾 科 男,1986年生,博士,副教授,研究方向为电力系统保护与控制、新型配电网故障定位与系统自我恢复。E-mail:ke.jia@ncepu.edu.cn   
作者简介: 顾晨杰 男,1991年生,硕士研究生,研究方向为光伏电站控制与保护。E-mail:guchenj@ncepu.edu.cn
引用本文:   
贾科, 顾晨杰, 毕天姝, 魏宏升, 杨奇. 大型光伏电站汇集系统的故障特性及其线路保护[J]. 电工技术学报, 2017, 32(9): 189-198. Jia Ke, Gu Chenjie, Bi Tianshu, Wei Hongsheng, Yang Qixun. Fault Characteristics and Line Protection within the Collection System of a Large-Scale Photovoltaic Power Plant. Transactions of China Electrotechnical Society, 2017, 32(9): 189-198.
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https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I9/189