Study on Frequency Stability of Long Distance AC/DC Hybrid Transmission System

doi:10.11985/2019.04.002

Abstract

Abstract:

For the two transmission modes of AC-parallel operation and non-parallel operation, when the transmission power of the DC transmission system drops due to the fault, the related theoretical derivation and simulation analysis are carried out on the influence of the frequency stability of the AC transmission system. The main factors affecting the frequency stability of AC/DC hybrid transmission systems with parallel and non-parallel structures are analyzed. Secondly, under the condition of DC system failure and different transmission distances, six machines are established by PSCAD/EMTDC simulation software. The four-zone and four-machine two-region transmission system model simulates the transmission system of two structures. Finally, the main factors affecting the frequency stability of AC/DC hybrid transmission system over long-distance and large-capacity transmission are obtained from the simulation results. Furthermore, the stability evaluation index of the long-distance and large-capacity transmission of the hybrid power grid is improved. The research results have certain guiding significance for the stable operation of long-distance AC-DC hybrid transmission systems.

Key words: AC/DC hybrid transmission, power transfer, frequency stability, parallel operation, non-parallel operation

CLC Number:

TM762

Xiaohong HAO,Kaiwei HU,Ming MA,Qiang ZHOU,Ningbo WANG. Study on Frequency Stability of Long Distance AC/DC Hybrid Transmission System[J]. Journal of Electrical Engineering, 2019, 14(4): 10-17.

Figures/Tables 24

References 24

[1]	李岩, 滕云, 徐明忻 , 等. 特高压交直流混联电网连锁故障安稳风险评估[J]. 高电压技术, 2018,44(11):3743-3750.
	Li Yan, Teng Yun, Xu Mingxin , et al. Security and stability analysis method for AC/DC UHV power system cascading failure based on improved risk assessment[J]. High Voltage Engineering, 2018,44(11):3743-3750.
[2]	李文博, 朱元振, 刘玉田 . 交直流混联系统连锁故障搜索模型及故障关联分析[J]. 电力系统自动化, 2018,42(22):59-72.
	Li Wenbo, Zhu Yuanzhen, Liu Yutian . Search model and fault correlation analysis of AC/DC hybrid power system[J]. Automation of Electric Power Systems, 2018,42(22):59-72.
[3]	付强, 杜文娟, 王海风 . 交直流混联电力系统小干扰稳定性分析综述[J]. 中国电机工程学报, 2018,38(10):2829-2840.
	Fu Qiang, Du Wenjuan, Wang Haifeng . Small signal stability analysis of AC/DC hybrid power system: An overview[J]. Proceedings of the CSEE, 2018,38(10):2829-2840.
[4]	贺杨烊, 郑晓冬, 邰能灵 , 等. 交直流混联电网LCC- HVDC换流器建模方法综述[J]. 中国电机工程学报, 2019,39(11):3119-3129.
	He Yangyang, Zheng Xiaodong, Tai Nengling , et al. A review of modeling methods for LCC-HVDC converter in AC/DC hybrid power grid[J]. Proceedings of the CSEE, 2019,39(11):3119-3129.
[5]	董希建, 罗剑波, 李雪明 , 等. 交直流混联受端电网频率紧急协调控制技术及应用[J]. 电力系统保护与控制, 2018,46(18):59-66.
	Dong Xijian, Luo Jianbo, Li Xueming , et al. Technology and application of frequency coordinated emergency control for AC/DC hybrid receiving power grid[J]. Power System Protection and Control, 2018,46(18):59-66.
[6]	陈湘, 刘兵, 任大江 , 等. 交直流混联系统直流功率转移对交流电压的影响[J]. 电网技术, 2016,40(7):1957-1961.
	Chen Xiang, Liu Bing, Ren Dajiang , et al. Effect of DC power transfer on AC voltage in AC/DC hybrid system[J]. Power System Technology, 2016,40(7):1957-1961.
[7]	唐晓骏, 程振龙, 张鑫 , 等. 交直流混联系统电压稳定在线评估体系[J]. 电网技术, 2014,38(5):1175-1180.
	Tang Xiaojun, Cheng Zhenlong, Zhang Xin , et al. Hybrid AC and DC line voltage stability evaluation system[J]. Power System Technology, 2014,38(5):1175-1180.
[8]	罗瑞, 樊艳芳, 刘群杰 . 基于时域的交直流混联系统抗过渡电阻的单相接地距离保护研究[J]. 电力系统及其自动化学报, 2019,22(4):1-7.
	Luo Rui, Fan Yanfang, Liu Qunjie . Study on single-phase grounding distance protection of transition resistance based on time domain in AC/ DC hybrid system[J]. Journal of Electric Power System and Automation, 2019,22(4):1-7.
[9]	陈汉雄 . 直流功率转移对川渝弱交流电网安全稳定影响分析[J]. 电网技术, 2018,42(12):4145-4152.
	Chen Hanxiong . Analysis and study on DC power transfer and impact on Sichuan-Chongqing grid weak AC system security and stability[J]. Power System Technology, 2018,42(12):4145-4152.
[10]	李明节 . 大规模特高压交直流混联电网特性分析与运行控制[J]. 电网技术, 2016,40(4):985-991.
	Li Mingjie . Characteristics analysis and operation control of large-scale UHV AC/DC power grids[J]. Power System Technology, 2016,40(4):985-991.
[11]	陆文甜, 林舜江, 刘明波 . 远距离交直流并联输电通道联络线的有功优化分配[J]. 华南理工大学学报, 2017,45(7):16-24.
	Lu Wentian, Lin Shunjiang, Liu Mingbo . Active power optimization of long-distance AC-DC parallel transmission channel linkage[J]. Journal of South China University of Technology, 2017,45(7):16-24.
[12]	李伟, 肖湘宁, 郭琦 . 云广特高压直流送端孤岛运行超低频振荡与措施[J]. 电力系统自动化, 2018,42(16):161-166.
	Li Wei, Xiao Xiangning, Guo Qi . Ultra-low-frequency oscillation and countermeasures in Yunnan-Guangdong UHVDC sending-end system in islanded operating mode[J]. Automation of Electric Power Systems, 2018,42(16):161-166.
[13]	汪娟娟, 黄梦华, 傅闯 . 交流故障下高压直流运行特性及恢复策略研究[J]. 中国电机工程学报, 2019,39(2):514-523.
	Wang Juanjuan, Huang Menghua, Fu Chuang . Research on operational characteristics and recovery strategy of HVDC under AC fault[J]. Proceedings of the CSEE, 2019,39(2):514-523.
[14]	李伟, 肖湘宁, 陶顺 , 等. 特高压直流送端孤岛系统频率稳定控制[J]. 电力自动化设备, 2018,38(11):197-203.
	Li Wei, Xiao Xiangning, Tao Shun , et al. Frequency stability control of UHV DC transmission island system[J]. Electric Power Automation Equipment, 2018,38(11):197-203.
[15]	王华昕, 陆斌, 赵永熹 , 等. 交直流混联式三端半波长输电拓扑结构[J]. 电网技术, 2018,42(12):4061-4068.
	Wang Huaxin, Lu Bin, Zhao Yongxi , et al. AC/DC hybrid three-terminal half-wavelength transmission topology[J]. Power System Technology, 2018,42(12):4061-4068.
[16]	郑超, 马世英, 申旭辉 , 等. 强直弱交的定义、内涵与形式及其应对措施[J]. 电网技术, 2017,41(8):2491-2498.
	Zheng Chao, Ma Shiying, Shen Xuhui , et al. Definition, connotation and form of strong and weak crossing and its countermeasures[J]. Power System Technology, 2017,41(8):2491-2498.
[17]	李伟, 肖湘宁, 郭琦 . 抑制云广特高压直流孤岛运行甩负荷过电压的控制逻辑优化研究[J]. 中国电机工程学报, 2017,37(5):1373-1379.
	Li Wei, Xiao Xiangning, Guo Qi . Study on control logic optimization for suppressing overload and overvoltage of Yunguang UHV DC islands[J]. Proceedings of the CSEE, 2017,37(5):1373-1379.
[18]	王雅婷, 张一驰, 郭小江 , 等. ±1 100 kV特高压直流送受端接入系统方案研究[J]. 电网技术, 2016,40(7):1927-1933.
	Wang Yating, Zhang Yichi, Guo Xiaojiang , et al. Study on the scheme of ±1 100 kV UHV DC transmitter and receiver access system[J]. Power System Technology, 2016,40(7):1927-1933.
[19]	李新年, 雷霄, 陈树勇 . ±1 100 kV特高压直流接入系统控制策略优化[J]. 电网技术, 2016,40(5):1326-1333.
	Li Xinnian, Lei Xiao, Chen Shuyong . Optimization of control strategy for ±1 100 kV UHVDC access system[J]. Power System Technology, 2016,40(5):1326-1333.
[20]	Kalcon G O, Adam G P, Anaya-Lara O , et al. Small- signal stability analysis of multi-terminal VSC-based DC tranmittssion systems[J]. IEEE Transactions on Power Systems, 2012,27(4):1818-1830.
[21]	孟祥萍, 高嬿 . 电力系统分析[M]. 北京:高等教育出版社, 2010.
[22]	韩润, 滕予非, 谢剑 , 等. 基于改进STD法的电力系统低频振荡辨识[J]. 电力自动化设备, 2019,39(3):58-63.
	Han Run, Teng Yufei, Xie Jian , et al. Identification of low frequency oscillation in power pystem based on improved STD method[J]. Electric Power Automation Equipment, 2019,39(3):58-63.
[23]	肖繁, 王涛, 高扬 , 等. 基于特高压交直流混联电网的调相机无功补偿及快速响应机制研究[J]. 电力系统保护与控制, 2019,47(17):93-100.
	Xiao Fan, Wang Tao, Gao Yang , et al. Research on reactive power compensation and fast response mechanism of camera based on UHV AC-DC hybrid power grid[J]. Power System Protection and Control, 2019,47(17):93-100.
[24]	周煜智, 徐政, 董桓锋 . 直流孤岛送电系统的功率输送能力分析[J]. 电力自动化设备, 2017,37(10):93-99,106.
	Zhou Yuzhi, Xu Zheng, Dong Huanfeng . Analysis of power transmission capability of DC island transmission system[J]. Electric Power Automation Equipment, 2017,37(10):93-99,106.

运行模式	输送距离S/km	功率P₁/MW	功率P_ac₁/MW	功率P_ac₂/MW
并联结构	300	1 400	400	1 000
非并联结构	300	1 600	700	1 400

运行模式	输送距离S/km	功率$\Delta P_{ac1}$/MW	功率$\Delta P_{ac2}$/MW	频率$\Delta f_{1}$/Hz	频率$\Delta f_{2}$/Hz
并联结构	300	300	400	0.6~–0.8	0.6~–0.8
非并联结构	300	100	200	0.8	±0.4

运行模式	输送距离S/km	功率P₁/MW	功率P_ac₁/MW	功率P_ac₂/MW
并联结构	500	1 700	650	1 500
非并联结构	500	1 700	750	1 300

运行模式	输送距离S/km	功率$\Delta P_{ac1}$/MW	功率$\Delta P_{ac2}$/MW	频率 $\Delta f_{1}$/Hz	频率$\Delta f_{2}$/Hz
并联结构	500	150	300	±0.6	±0.6
非并联结构	500	150	150	1.25~–0.5	1.25~–0.5

运行模式	输送距离S/km	功率P₁/MW	功率P_ac₁/MW	功率P_ac₂/MW
并联结构	900	2 400	900	2 200
非并联结构	900	2 000	900	1 500