锁相环的动态性能及对线路保护的影响分析

doi:10.11930/j.issn.1004-9649.201806026

摘要/Abstract

摘要： 大规模并网的可再生能源网侧变流器多采用恒功率控制，控制系统中的锁相环决定了端口电压频率。锁相环基于正常运行工况设计，一般不考虑电网故障时的特性。针对锁相环的动态性能，研究了锁相环的结构，分析了电网不平衡、电压信号频率变化以及多阶信号输入条件下的特性，构建了一个40台风机的风电场等效模型，分析了锁相环性能对线路保护的影响。结果发现风电场规模增大后，差动保护和距离保护都会不同程度地受到影响，而90°功率方向元件性能可靠。分析结果为大规模可再生能源并网送出线及附近联络线的线路保护的选型及整定提供参考。

关键词: 锁相环, 线路保护, 可再生能源, 变流器, PSCAD/EMTDC

Abstract: The converters on the side of grid-connected renewable energy usually work on PQ mode. The phase lock loop (PLL) in the control system is the key component to determine the frequency of the terminal voltage. However, the PLL is designed based on normal operating conditions and the characteristics of the grid fault are generally not considered. The structure of the PLL is studied in this paper, and the characteristics of PLL are analyzed under the conditions of grid imbalance, frequency variation of voltage signal and multi-order signal input. On this basis, a wind farm equivalent model of 40 wind turbines are constructed, and the influence of PLL's performance on line protection is analyzed. It is found that when the wind farm's scale increases, the differential protection and distance protection will be affected in different degrees, but the 90° power directional element has a reliable performance. The analysis result can provide a reference for the selection and setting of line relay for large-scale integration of renewable energy.

Key words: phase lock loop, line relay, renewable energy, converter, PSCAD/EMTDC

汪冬辉, 方芳, 吕文韬, 罗华峰, 杨涛, 戚宣威. 锁相环的动态性能及对线路保护的影响分析[J]. 中国电力, 2020, 53(3): 110-118.

WANG Donghui, FANG Fang, LV Wentao, LUO Huafeng, YANG Tao, QI Xuanwei. Analysis of Dynamic Performance of Phase Lock Loop and Its Effect on Line Relay[J]. Electric Power, 2020, 53(3): 110-118.

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链接本文: https://www.electricpower.com.cn/CN/10.11930/j.issn.1004-9649.201806026

https://www.electricpower.com.cn/CN/Y2020/V53/I3/110

参考文献

[1] 年珩, 程鹏, 贺益康. 故障电网下双馈风电系统运行技术研究综述[J]. 中国电机工程学报, 2015, 35(16): 4184–4197
NIAN Heng, CHENG Peng, HE Yikang. Review on operation techniques for DFIG-based wind energy conversion systems under network faults[J]. Proceedings of the CSEE, 2015, 35(16): 4184–4197
[2] 林岩, 张建成. 含虚拟同步发电机的光/柴/储独立微网控制策略[J]. 电网技术, 2017, 41(4): 1277–1284
LIN Yan, ZHANG Jiancheng. Control strategy of islanded photovoltaic-diesel-storage microgrid with virtual synchronous generator[J]. Power System Technology, 2017, 41(4): 1277–1284
[3] 江海啸, 郑毅, 李少远, 等. 微网优化控制研究现状及智能化即插即用趋势与策略[J]. 上海交通大学学报, 2017, 51(9): 1097–1103
JIANG Haixiao, ZHENG Yi, LI Shaoyuan, et al. Operational optimization of micro-grid control: a brief introduction and an intelligent plug-and-play control strategy[J]. Journal of Shanghai Jiao Tong University, 2017, 51(9): 1097–1103
[4] 钟庆昌. 虚拟同步机与自主电力系统[J]. 中国电机工程学报, 2017, 37(2): 336–348
ZHONG Qingchang. Virtual synchronous machines and autonomous power systems[J]. Proceedings of the CSEE, 2017, 37(2): 336–348
[5] 曾正, 邵伟华, 刘清阳, 等. 并网逆变器数字锁相环的数学物理本质分析[J]. 电工技术学报, 2018, 33(4): 808–816
ZENG Zheng, SHAO Weihua, LIU Qingyang, et al. Mathematical and physical fundaments of digital phase-locked loop for grid-connected inverters[J]. Transactions of China Electrotechnical Society, 2018, 33(4): 808–816
[6] 颜湘武, 贾焦心, 王德胜, 等. 虚拟同步发电机的并网功率控制及模式平滑切换[J]. 电力系统自动化, 2018, 42(9): 91–99
YAN Xiangwu, JIA Jiaoxin, WANG Desheng, et al. Power control and smooth mode switchover for grid-connected virtual synchronous generators[J]. Automation of Electric Power Systems, 2018, 42(9): 91–99
[7] 王艳松, 孙明鸿. 含微网配电网的综合优化规划研究[J]. 中国电力, 2018, 51(2): 118–124
WANG Yansong, SUN Minghong. Research on comprehensive optimization for distribution network with micro-grid[J]. Electric Power, 2018, 51(2): 118–124
[8] 龚锦霞, 解大, 张延迟. 三相数字锁相环的原理及性能[J]. 电工技术学报, 2009, 24(10): 94–99, 121
GONG Jinxia, XIE Da, ZHANG Yanchi. Principle and performance of the three-phase digital phase-locked loop[J]. Transactions of China Electrotechnical Society, 2009, 24(10): 94–99, 121
[9] 汪冬辉, 姚旭, 张坤贤, 等. 独立运行微电网的故障特征分析[J]. 电力自动化设备, 2014, 34(3): 52–58
WANG Donghui, YAO Xu, ZHANG Kunxian, et al. Analysis on fault characteristics of independent microgrid[J]. Electric Power Automation Equipment, 2014, 34(3): 52–58
[10] 王颢雄, 马伟明, 肖飞, 等. dq双变换软件锁相环的数学模型研究[J]. 电工技术学报, 2011, 26(7): 237–241
WANG Haoxiong, MA Weiming, XIAO Fei, et al. Study of model of software phase locked-loop based on dual-dq synchronous transform[J]. Transactions of China Electrotechnical Society, 2011, 26(7): 237–241
[11] 吉正华, 韦芬卿, 杨海英. 基于dq变换的三相软件锁相环设计[J]. 电力自动化设备, 2011, 31(4): 104–107
JI Zhenghua, WEI Fenqing, YANG Haiying. Three-phase software phase-locked loop based on dq reference frame[J]. Electric Power Automation Equipment, 2011, 31(4): 104–107
[12] 袁志昌, 宋强, 刘文华. 改善动态相位跟踪和不平衡电压检测性能的改进软锁相环算法[J]. 电网技术, 2010, 34(1): 31–35
YUAN Zhichang, SONG Qiang, LIU Wenhua. A modified soft phase lock loop algorithm improving the performance in dynamic phase tracking and detection of unbalanced voltage[J]. Power System Technology, 2010, 34(1): 31–35
[13] 张治俊, 李辉, 张煦, 等. 基于单/双同步坐标系的软件锁相环建模和仿真[J]. 电力系统保护与控制, 2011, 39(11): 138–144
ZHANG Zhijun, LI Hui, ZHANG Xu, et al. Simulation and modelling of software phase-locked loop based on single/double synchronous coordinate system[J]. Power System Protection and Control, 2011, 39(11): 138–144
[14] ÁLVARO O, FEDERICO M. Comparison of different PLL implementations for frequency estimation and control[C]//2018 18th International Conference on Harmonics and Quality of Power (ICHQP). Ljubljana, Slovenia, Slovenia: IEEE, 2018: 1–6.
[15] ABDUL M K K, KAILATH B J. Novel PLL architecture with a composite PFD and variable loop filter[J]. IET Circuits, Devices & Systems, 2018, 12(3): 256–262.
[16] 张旭泽, 郑永康, 康小宁, 等. 智能变电站继电保护系统所面临的若干问题[J]. 电力系统保护与控制, 2018, 46(6): 90–96
ZHANG Xuze, ZHENG Yongkang, KANG Xiaoning, et al. Several problems of intelligent substation relay protection system[J]. Power System Protection and Control, 2018, 46(6): 90–96
[17] 宣晓华, 周野, 宋晓芳, 等. 基于系统与元件动态交互量化分析的电力系统连锁故障事故链识别方法[J]. 电力系统保护与控制, 2018, 46(2): 101–109
XUAN Xiaohua, ZHOU Ye, SONG Xiaofang, et al. A novel searching method of fault chains for power system cascading outages based on quantitative analysis of dynamic interaction between system and components[J]. Power System Protection and Control, 2018, 46(2): 101–109
[18] 康小宁, 屈亚军, 焦在滨, 等. 基于最小二乘矩阵束算法的工频分量提取方法[J]. 电力系统自动化, 2014, 38(21): 66–70, 113
KANG Xiaoning, QU Yajun, JIAO Zaibin, et al. Power-frequency phasor extraction based on least-square matrix pencil algorithm[J]. Automation of Electric Power Systems, 2014, 38(21): 66–70, 113
[19] 李书勇, 郭琦, 崔柳, 等. 特高压直流输电线路雷击暂态过程与行波保护响应特性分析[J]. 电网技术, 2015, 39(10): 2830–2835
LI Shuyong, GUO Qi, CUI Liu, et al. Thunderstruck transient process of UHVDC transmission line and response characteristic of traveling wave protection[J]. Power System Technology, 2015, 39(10): 2830–2835
[20] 姚亮, 胡再超, 杭泱. 常见傅里叶变换的滤波性能分析[J]. 电力自动化设备, 2008, 28(1): 73–76
YAO Liang, HU Zaichao, HANG Yang. Performance analysis of filtering algorithms based on Fourier transform[J]. Electric Power Automation Equipment, 2008, 28(1): 73–76
[21] 任洪波, 邱留良, 吴琼, 等. 分布式能源系统优化与设计综述[J]. 中国电力, 2017, 50(7): 49–55
REN Hongbo, QIU Liuliang, WU Qiong, et al. A review of optimization planning and designing of distributed energy systems[J]. Electric Power, 2017, 50(7): 49–55
[22] 李亚馨, 陈红坤, 杨睿茜, 等. 双馈风电机组动态等值模型仿真研究[J]. 武汉大学学报(工学版), 2017, 50(3): 401–408
LI Yaxin, CHEN Hongkun, YANG Ruixi, et al. Dynamic equivalence model simulation of DFIG-based wind turbine[J]. Engineering Journal of Wuhan University, 2017, 50(3): 401–408
[23] 肖繁, 尹柳, 戚宣威, 等. 双馈电源接入对变压器差动保护的影响机理分析[J]. 浙江电力, 2018, 37(12): 45–51
XIAO Fan, YIN Liu, QI Xuanwei, et al. Influence mechanism analysis of doubly fed induction generator access on differential protection of transformer[J]. Zhejiang Electric Power, 2018, 37(12): 45–51
[24] 李一泉, 王增超, 刘玮, 等. 相邻变电站交互型广域后备保护应对站用直流失压方法[J]. 浙江电力, 2019, 38(6): 17–20
LI Yiquan, WANG Zengchao, LIU Wei, et al. A method of wide-area backup protection based on interaction with adjacent substation for substation's DC power loss[J]. Zhejiang Electric Power, 2019, 38(6): 17–20