电压不平衡时基于改进无差拍控制的VSC-HVDC系统

doi:10.16180/j.cnki.issn1007-7820.2020.04.007

摘要/Abstract

摘要：

VSC-HVDC在电网电压不平衡情况下,输出功率及直流母线电压会产生二倍频波动,进而影响系统的稳定运行。文中研究了柔性直流输电系统在电压不平衡情况下的改进无差拍控制策略,该策略以瞬时有功功率波动分量为零为约束条件,推导了正负序参考电流表达式。针对传统无差拍控制算法存在的控制延时及对交流侧电感参数变化鲁棒性差的问题,提出了一种改进无差拍控制策略。该控制策略利用拉格朗日插值法预测出下一个采样时刻的参考电流;对电网电压进行了线性预测;对网侧电流进行了非线性预测。最后借助MATLAB/Simulink平台搭建相应的仿真模型,仿真结果证明了该控制策略的正确性和有效性。

关键词: 柔性直流输电, 无差拍控制, 拉格朗日插值法, 不平衡电网, 控制延时

Abstract:

In the case of unbalanced grid voltage, the output power and DC bus voltage of the VSC-HVDC will induce double frequency fluctuation, which affects the stable operation of the system. Aiming to solve the problem, the improved deadbeat control strategy for flexible DC transmission systems under voltage imbalance was studied. The positive and negative sequence reference current expressions were derived by taking the instantaneous active power fluctuation component as zero. Aiming at the control delay of the traditional deadbeat control algorithm and the poor robustness of the change of the inductance parameters on the AC side, an improved deadbeat control strategy was proposed. The control strategy used Lagrangian interpolation to predict the reference current at the next sampling time, then linearly predicted the grid voltage and nonlinearly predicts the grid side current. Finally, the corresponding simulation model was built by MATLAB/Simulink platform. The simulation results proved the correctness and effectiveness of the control strategy.

Key words: flexible HVDC transmission, deadbeat control, Lagrange interpolation, unbalanced grid, control delay

中图分类号:

TP29

付子义,杜田雨. 电压不平衡时基于改进无差拍控制的VSC-HVDC系统[J]. 电子科技, 2020, 33(4): 35-42.

FU Ziyi,DU Tianyu. VSC-HVDC System with Improved Deadbeat Control when Voltage is Unbalanced[J]. Electronic Science and Technology, 2020, 33(4): 35-42.

图/表 5

图1

图2

图3

图4

图5

参考文献 19

[1]	汤广福, 贺之渊, 庞辉 . 柔性直流输电工程技术研究、应用及发展[J]. 电力系统自动化, 2013,37(15):3-14.
	Tang Guangfu, He Zhiyuan, Pang Hui . Research,application and development of VSC-HVDC engineering technology[J]. Automation of Electric Power Systems, 2013,37(15):3-14.
[2]	徐政, 薛英林, 张哲任 . 大容量架空线柔性直流输电关键技术及前景展望[J]. 中国电机工程学报, 2014,34(29):5051-5062. doi: 10.13334/j.0258-8013.pcsee.2014.29.006
	Xu Zheng, Xue Yinglin, Zhang Zheren . VSC-HVDC technology suitable for bulk power overhead line transmission[J]. Proceedings of the CSEE, 2014,34(29):5051-5062. doi: 10.13334/j.0258-8013.pcsee.2014.29.006
[3]	徐鹏坤, 单晓晨 . 基于光伏源的微电网孤岛/联网平滑切换控制[J]. 电子科技, 2018,31(3):67-71.
	Xu Pengkun, Shan Xiaochen . Aresearch on smooth switching between island and grid-connected operation mode based on micogrid with photovoltaic generations[J]. Electronic Science and Technology, 2018,31(3):67-71.
[4]	陈谦, 唐国庆, 胡铭 . 采用dq0坐标的VSC-HVDC稳态模型与控制器设计[J]. 电力系统自动化, 2004(16):61-66.
	Chen Qian, Tang Guoqing, Hu Ming . VSC-HVDC steady state model and controller design of A VSC-HVDC converter based on dq0-axis[J]. Automation of Electric Power Systems, 2004(16):61-66.
[5]	孙黎霞, 王哲, 朱鹏飞 , 等. 电网电压不平衡时VSC-HVDC优化控制策略[J]. 高电压技术, 2016,42(1):47-55.
	Sun Lixia, Wang Zhe, Zhu Pengfei , et al. Optimization control strategy of VSC-HVDC with unbalance grid voltage conditions[J]. High Voltage Engineering, 2016,42(1):47-55.
[6]	陈海荣, 张静, 屠卿瑞 . 电网电压不平衡时电压源换流器型直流输电的负序电压补偿控制[J]. 高电压技术, 2011,37(10):2363-2369.
	Chen Hairong, Zhang Jing, Tu Qingrui . Negative voltage compensation control of voltage source converter based HVDC system under unbalanced grid conditions[J]. High Voltage Engineering, 2011,37(10):2363-2369.
[7]	魏晓云, 孙辉, 徐凤阁 , 等. 矢量电流控制的电压源换流器式高压直流输电系统动态特性分析[J]. 中国电机工程学报, 2010,30(6):34-40.
	Wei Xiaoyun, Sun Hui, Xu Fengge , et al. Dynamic performance analysis of vector current controlled VSC-HVDC[J]. Proceedings of the CSEE, 2010,30(6):34-40.
[8]	傅晓帆, 周克亮, 程明 , 等. 风电场并网用VSC-HVDC的无差拍解耦控制策略[J]. 电工技术学报, 2009,24(11).
	Fu Xiaofan, Zhou Keliang, Cheng Ming , et al. Deadbeat decoupling control of VSC-HVDC systems for grid connection of wind farms[J]. Transactions of China Electrotechnical Society, 2009,24(11):157-154.
[9]	傅晓帆, 周克亮, 程明 . 近海风电场并网用多端口VSC-HVDC系统的无差拍协同控制策略[J]. 电工技术学报, 2011,26(7):51-59.
	Fu Xiaofan, Zhou Keliang, Cheng Ming . Synergy deadbeat control scheme for multi-terminal VSC-HVDC systems for grid connection of off-shore wind farms[J]. Transactions of ChinaElectrotechnical Society, 2011,26(7):51-59.
[10]	袁旭峰, 高璐, 文劲宇 , 等. VSC-HVDC三相不平衡控制策略[J]. 电力自动化设备, 2010,30(9):1-5.
	Yuan Xufeng, Gao Lu, Wen Jinyu , et al. Unbalanced three-phase control strategy of VSC-HVDC system[J]. Electric Power Automation Equipment, 2010,30(9):1-5.
[11]	张兴, 季建强, 张崇巍 , 等. 基于内模控制的三相电压型PWM整流器不平衡控制策略研究[J]. 中国电机工程学报, 2005,25(13):51-56.
	Zhang Xing, Ji Jianqiang, Zhang Chongwei , et al. Study of internal model control unbalance control based three-phase PWM rectifier under unbalance input voltage condition[J]. Proceedings of the CSEE, 2005(13):51-56.
[12]	陈燕东, 罗安, 周乐明 , 等. 一种功率前馈的鲁棒预测无差拍并网控制方法[J]. 中国电机工程学报, 2013(36):62-70.
	Chen Yandong, Luo An, Zhou Leming , et al. A robust feed-before-behaved method for robust prediction of gridless grid-connected control[J]. Proceedings of the CSEE, 2013,33(36):62-70,10.
[13]	张崇巍, 张兴 . PWM整流器及其控制[M]. 北京: 机械工业出版社, 2003.
	Zhang Chongwei, Zhang Xing. PWM rectifier and its control[M]. Beijing: Mechanical Industry Press, 2003.
[14]	梁营玉, 杨奇逊, 刘建政 , 等. 电网电压不平衡时MMC-HVDC的无差拍直接功率控制[J]. 电工技术学报, 2015,30(15):15-25.
	Liang Yingyu, Yang Qixun, Liu Jianzheng , et al. Deadbeat direct power control for MMC-HVDC under unbalanced grid voltages[J]. Transactions of China Electrotechnical Society, 2015,30(15):15-25.
[15]	邓雪松, 欧开健, 陈鹏 , 等. 基于无差拍电流控制的MMC-HVDC系统控制策略研究[J]. 电力系统保护与控制, 2014,42(8):34-39.
	Deng Xuesong, Ou Kaijian, Chen Peng , et al. Study of control strategy for MMC-HVDC system based on deadbeat current control[J]. Power System Protection and Control, 2014,42(8):34-39.
[16]	杨立永, 杨烁, 张卫平 , 等. 单相PWM整流器改进无差拍电流预测控制方法[J]. 中国电机工程学报, 2015,35(22):5842-5850.
	Yang Liyong, Yang Shuo, Zhang Weiping , et al. The improved deadbeat predictive current control method for single-phase PWM rectifiers[J]. Proceedings of the CSEE, 2015,35(22):5842-5850.
[17]	谭翠兰, 陈启宏, 张立炎 , 等. 三相四桥臂并网逆变器的无差拍重复控制[J]. 电力系统自动化, 2018,42(18):142-154.
	Tan Cuilan, Chen Qihong, Zhang Liyan , et al. Deadbeat and repetitive control for grid-connected three-phase four-leg inverters[J]. Automation of Electric Power Systems, 2018,42(18):142-154.
[18]	梁营玉, 刘建政, 李治艳 . 有源电力滤波器改进无差拍-重复控制策略[J]. 电工技术学报, 2018,33(19):4573-4582.
	Liang Yingyu, Liu Jianzheng, Li Zhiyan . Improved deadbeat-repetitive control strategy for active power filter[J]. Transactions of China Electrotechnical Society, 2018,33(19):4573-4582.
[19]	蔺小林, 蒋耀林 . 现代数值分析[M]. 北京: 国防工业出版社, 2004.
	Lin Xiaolin, Jiang Yaolin. Modern numerical analysis[M]. Beijing: National Defence Industry Press, 2004.