Analysis and Calculation of Main Circuit Steady-State Parameters of UHVDC Transmission System with Hierarchical Connection Mode

doi:10.3969/j.issn.1000-7229.2016.02.013

Abstract

Abstract:

It is necessary to calculate the main circuit steadystate parameters at the beginning of the planning and design of HVDC projects. Firstly, this paper simplifies UHVDC transmission system with hierarchical connection mode into two singlelayer systems, and concludes the method of main circuit steadystate parameters calculation for singlelayer system. Then we analyze two ways to increase the reactive power of converters during low power transmission and present the corresponding reactive power validations. If the DC current increases due to its reactive power requirement in one system, the DC current through the hierarchical systems after reactive power validation will be different in low power condition. Aiming at this problem, we propose calculation between layers as a solution. The lowest DC voltage across the converters of hierarchical systems is selected to be the control voltage between layers, the other control parameters of the converters are adjusted according to this voltage. We analyze the changing characteristics of extinction angle, ideal noload DC voltage, as well as the reactive power consumption of converter after adjustment with using Matlab. At last, we analyze the steadystate operating characteristics with an example, while verifying the reasonability and effectiveness of the proposed algorithm.

Key words: UHVDC transmission system with hierarchical connection mode, low power transmission, reactive power validation, calculation between layers, main circuit steady-state parameters

CLC Number:

TM 72

MIAO Lili, ZHU Kunlin, WEN Boying. Analysis and Calculation of Main Circuit Steady-State Parameters of UHVDC Transmission System with Hierarchical Connection Mode[J]. Electric Power Construction, 2016, 37(2): 91-99.

References

［1］赵畹君.高压直流输电工程技术［M］.北京：中国电力出版社, 2004：18-29.
［2］高媛, 韩民晓. 特高压直流输电多端馈入方式稳态特性研究［J］. 电网技术, 2014, 38（12） :3447-3453.
GAO Yuan, HAN Minxiao, Steady State Characteristic of Multi Infeed UHVDC Power Transmission［J］. Power System Technology, 2014, 38（12）: 3447-3453.
［3］刘振亚, 秦晓辉, 赵良,等. 特高压直流分层接入方式在多馈入直流电网的应用研究［J］. 中国电机工程学报, 2013, 33（10） :1-7.
LIU Zhenya, QIN Xiaohui, ZHAO Liang, et al. Study on the application of UHVDC hierarchical connection mode to multi-infeed HVDC system［J］. Proceedings of the CSEE, 2013, 33（10） :1-7.
［4］王峰. 高压直流输电系统基本设计若干问题研究［D］. 浙江：浙江大学, 2011.
WANG Feng. Research on several issues in HVDC transmission design［D］. Zhejiang: Zhejiang University, 2011.
［5］邓旭, 王东举, 沈扬,等. ±1 100 kV准东—四川特高压直流输电工程主回路参数设计［J］. 电力自动化设备, 2014, 34（4）:133-140.
DENG Xu, WANG Dongju, SHEN Yang, et al. Main circuit parameter design of Zhundong—Sichuan ±1 100 kV UHVDC power transmission project［J］. Electric Power Automation Equipment, 2014, 34（4）:133-140.
［6］张相宇, 温渤婴, 李鹏. 高压直流输电系统主回路参数计算平台的研发［J］. 电力建设, 2014, 35（2）: 52-56.
ZHANG Xiangyu, WEN Boying, LI Peng. Research and development of computing platform for main circuit parameters in HVDC power system［J］. Electric Power Construction, 2014, 35（2）: 52-56.
［7］陈锡磊, 周浩, 沈扬,等. 溪洛渡—浙西±800 kV /7500 MW特高压直流输电工程主回路参数设计［J］. 电网技术, 2011,35（12）:26-32.
CHEN Xilei, ZHOU Hao, SHEN Yang, et al. Study and design of main circuit parameters for ±800 kV /7500 MW DC power transmission project from Xiluodu to Zhexi［J］. Power System Technology, 2011, 35（12）:26-32.
［8］王峰, 徐政, 黄莹,等. 高压直流输电主回路稳态参数计算［J］. 电工技术学报, 2009, 24（5）:135-140.
WANG Feng, XU Zheng, HUANG Ying. Calculation of main circuit parameters for HVDC transmission［J］. Transactions of China Electrotechnical Society, 2009, 24（5）: 135-140.
［9］李少华,王秀丽,张望,等. 特高压直流分层接入交流电网方式下直流控制系统设计［J］. 中国电机工程学报, 2015, 35（10）: 2409-2416.
LI Shaohua, WANG Xiuli, ZHANG Wang, et al. Control system design for UHVDC hierarchical connection to AC grid［J］. Proceedings of the CSEE, 2015, 35（10）: 2409-2416.
［10］郭龙,刘崇茹,贠飞龙,等.±1 100 kV直流系统分层接入方式下的功率协调控制［J］.电力系统自动化,2015,39（11）:24-30.
GUO Long, LIU Chongru, YUN Feilong, et al. Power coordination control of ±1 100 kV UHVDC system with hierarchical connection Mode［J］. Automation of Electric Power Systems,2015,39（11）:24-30.
［11］朱坤琳, 温渤婴. 高压直流输电系统的无功功率平衡和控制方法［J］. 电力建设, 2015, 36（9）:35-42.
ZHU Kunlin, WEN Boying. Reactive power balance and control methods in HVDC transmission system［J］. Electric Power Construction, 2015, 36（9）: 35-42.
［12］戴国安, 周君文, 王亚非. 特高压直流无功控制策略研究［J］. 电力系统保护与控制, 2008, 36（14）:48-51.
DAI Guoan, ZHOU Junwen, WANG Yafei. Strategy of reactive power control on UHVDC［J］. Power System Protection and Control, 2008, 36 （14）:48-51.
［13］张望, 郝俊芳, 曹森,等. 直流输电换流站无功功率控制功能设计［J］. 电力系统保护与控制, 2009, 37（14）:72-76.
ZHANG Wang, HAO Junfang, CAO Sen, et al. Design of reactive power control for HVDC converter station［J］. Power System Protection and Control, 2009, 37（14）:72-76.
［14］杨志栋, 殷威扬, 李亚男. 三沪直流工程无功补偿和控制方案［J］. 电力建设, 2007, 28（12）:10-13.
YANG Zhidong, YIN Weiyang, LI Yanan. Reactive power compensation and control scheme for the Three Gorges to Shanghai DC project［J］. Electric Power Construction, 2007, 28（12）:10-13.
［15］张啸虎, 曹国云, 陈陈. 高压直流系统低功率运行时的无功控制策略［J］. 电网技术, 2012, 36（1）:118-122.
ZHANG Xiaohu, CAO Guoyun, CHEN Chen. Proposal on reactive power control of HVDC system during low power transmission［J］. Power System Technology, 2012, 36（1）:118-122.
［16］肖鸣, 傅闯, 梁志飞. 高压直流低负荷无功优化功能运行分析［J］. 电力系统自动化, 2010, 34（15）:91-95.
XIAO Ming, FU Chuang, LIANG Zhifei. An operation analysis of HVDC low load reactive power optimization function［J］. Automation of Electric Power Systems, 2010, 34（15）:91-95.
［17］王永旭, 温渤婴. 高压直流输电交流滤波器与交流系统最大并联阻抗的分析与计算［J］. 中国电机工程学报, 2015, 35（11）: 2703-2710.
WANG Yongxu, WEN Boying. Computation and analysis of maximum parallel impedance between the AC filter and AC network in HVDC transmission system［J］. Proceedings of the CSEE, 2015, 35（11）: 2703-2710.

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