Self-Energy Storage Back-to-Back VSC-MTDC Control Strategy Based on Virtual DC Generator

doi:10.16628/j.cnki.2095-8188.2021.11.008

Abstract

Abstract:

The self-energy storage back-to-back VSC-MTDC system can cause large DC bus voltage fluctuations when the power suddenly changes.In order to enhance the coordinated control capability of the self-energy storage back-to-back VSC-MTDC,a self-energy storage back-to-back VSC-MTDC improved voltage margin control strategy based on virtual DC generator is proposed.The energy storage DC/DC adopts virtual DC generator control in one adjustment process,the setting method of time parameters in the secondary regulation process of energy storage unit is given,this paper also establishes a coordinated working mechanism between the energy storage and each port under several typical operating conditions to improve the dynamic adjustment capability of the system power and the dynamic stability of the DC bus voltage.Finally,a simulation analysis of various operating conditions of the system was carried out to verify the effectiveness of the proposed coordinated control strategy.

Key words: back-to-back voltage source converter multi-terminal direct current (VSC-MTDC), energy storage, DC bus voltage, coordinated control strategy, virtual DC generator

CLC Number:

TM734

SUN Jian, ZHOU Jianhua, GE Le, XIAO Xiaolong, SU Wei. Self-Energy Storage Back-to-Back VSC-MTDC Control Strategy Based on Virtual DC Generator[J]. LOW VOLTAGE APPARATUS, 2021, 0(11): 50-57.

Figures/Tables 12

References 21

[1]	蔡晖, 彭竹弈, 张文嘉, 等. 柔性直流输电技术在江苏电网的应用研究[J]. 电力电容器与无功补偿, 2019, 40(2):90-94,100.
[2]	ZHENG X U, CHEN H. Review and applications of VSC HVDC[J]. High Voltage Engineering, 2007, 33(1):1-10.
[3]	葛乐, 陆文涛, 袁晓冬, 等. 背靠背柔性直流互联的有源配电网合环优化运行[J]. 电力系统自动化, 2017, 41(6):135-141.
[4]	CAO W Y, WU J Z, NICK J, et al. Operating principle of soft open points for electrical distribution network operation[J]. Applied Energy, 2016, 164:245-257. doi: 10.1016/j.apenergy.2015.12.005
[5]	王翠翠, 王维庆, 王海云, 等. 基于WSE-RVM的柔性多端直流输电换流器故障诊断[J]. 高压电器, 2018, 54(4):72-80.
[6]	李梅航, 刘喜梅, 陈朋. 适用于多端柔性直流输电系统的快速电压裕度控制策略[J]. 电网技术, 2016, 40(10):3045-3051.
[7]	GUO X L, YAN J M, XU G Y, et al. Control of VSC-HVDC connected wind farms for system frequency support[J]. International Transactions on Electrical Energy Systems, 2020, 30(5):1-13.
[8]	金晶, 殷勤. 含电阻型超导限流器的南澳柔性直流系统故障特性分析[J]. 高压电器, 2020, 56(12):286-291.
[9]	刘耀, 吴佳玮, 赵小令, 等. 基于电池储能的MMC-HVDC系统的建模与仿真[J]. 电力工程技术, 2020, 39(4):48-54.
[10]	涂小涛, 高仕龙, 陈锐, 等. 多端柔性交直流混合配电网建模及仿真分析[J]. 电器与能效管理技术, 2020(1):58-63.
[11]	王欣竹, 韩民晓, 马秀达, 等. 柔性交直流混合配电网互联换流站的控制策略[J]. 电器与能效管理技术, 2018(20):1-7.
[12]	刘瑜超, 武健, 刘怀远, 等. 基于自适应下垂调节的VSC-MTDC功率协调控制[J]. 中国电机工程学报, 2016, 36(1):40-48.
[13]	陈朋, 李梅航, 严兵, 等. 适用于多端柔性直流输电系统的灵活下垂控制策略[J]. 电网技术, 2016, 40(11):3433-3440.
[14]	索之闻, 李庚银, 迟永宁, 等. 适用于海上风电的多端口直流变电站及其主从控制策略[J]. 电力系统自动化, 2015, 39(11):16-23.
[15]	陈海荣, 徐政. 适用于VSC-MTDC系统的直流电压控制策略[J]. 电力系统自动化, 2006, 30(19):28-33.
[16]	葛乐, 张伟, 袁晓冬, 等. 自储能多端背靠背柔性直流系统控制策略[J]. 电力自动化设备, 2019, 39(12):14-20.
[17]	TAN S C, DONG G, ZHANG H, et al. Virtual DC machine control strategy of energy storage converter in DC microgrid:2016 IEEE Electrical Power and Energy Conference (EPEC) [C]. 2016.
[18]	张辉, 谭树成, 肖曦, 等. 具有直流电机特性的储能接口变换器控制策略[J]. 高电压技术, 2018, 44(1):119-125.
[19]	王军章, 兰征. 虚拟同步发电机用双向直流变换器研究[J]. 浙江电力, 2019, 38(4):20-27.
[20]	赵钰彬, 赵兴勇, 陆维, 等. 基于双重移相控制的直流微电网双主动全桥DC/DC变换器[J]. 广东电力, 2019, 32(1):60-67.
[21]	SOUMYA S, PRAKASH M J, KRISHNA R B. Virtual DC machine:an inertia emulation and control technique for a bidirectional DC-DC converter in a DC microgrid[J]. IET Electric Power Applications, 2018, 12(6):874-884. doi: 10.1049/elp2.v12.6

参数	数值
VSC1容量/MW	6
VSC2容量/MW	5
VSC3容量/MW	5
储能功率/容量/(MW·MWh^-1)	3
直流母线电压/kV	10
直流侧电容/μF	4 700
等值电感/mH	6
等值电阻/Ω	0.5

参数	数值
D	20
R_a/Ω	0.5
J/(kg·m²)	8
C_TΦ/Wb	5.1
ω₀/(rad·s^-1)	2π·50