直流断线故障下海上风电经柔性直流送出系统的暂态特性

doi:10.12204/j.issn.1000-7229.2021.04.011

电力建设 ›› 2021, Vol. 42 ›› Issue (4): 97-104.doi: 10.12204/j.issn.1000-7229.2021.04.011

直流断线故障下海上风电经柔性直流送出系统的暂态特性

黄阮明¹, 迟永宁², 汪军³, 张梦瑶¹, 郭明星¹, 李琰², 姚骏³

1.国网上海市电力公司经济技术研究院,上海市 200120
2.新能源与储能运行控制国家重点实验室(中国电力科学研究院有限公司),北京市 100192
3.输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市400044

收稿日期:2020-09-22 出版日期:2021-04-01 发布日期:2021-03-30
作者简介:黄阮明(1980),男,硕士,高级工程师,主要研究方向为电网规划与新能源发电并网技术|迟永宁(1973),男,博士,教授级高级工程师,主要研究方向为新能源并网技术及电力系统稳定|汪军(1998),男,硕士研究生,主要研究方向为新能源电能变换以及柔性直流输电技术|张梦瑶(1990),女,硕士,工程师,主要研究方向为电网规划与新能源发电并网技术|郭明星(1978),男,硕士,高级工程师,主要研究方向为电网规划与新能源发电并网技术|李琰(1977),男,博士,教授级高级工程师,主要研究方向为电力系统分析、新能源发电建模及其并网仿真
基金资助:
国家电网公司科技项目“含大规模海上风电的交直流混合系统接入受端电网关键技术研究”(4000-202055045A-0-0-00)

Transient Characteristics of Offshore Wind Power Sending System via Flexible HVDC Transmission System Under DC Line Breakage Fault

HUANG Ruanming¹, CHI Yongning², WANG Jun³, ZHANG Mengyao¹, GUO Mingxing¹, LI Yan², YAO Jun³

1. State Grid Shanghai Electric Power Economic and Technology Research Institute, Shanghai 200120, China
2. State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems (China Electric Power Research Institute), Beijing 100192, China
3. State Key Laboratory of Power Transmission Equipment & System Security and New Technology (Chongqing University), Chongqing 400044, China

Received:2020-09-22 Online:2021-04-01 Published:2021-03-30
Supported by:
State Grid Corporation of China Research Program(4000-202055045A-0-0-00)

摘要/Abstract

摘要：

断线故障为常见的直流故障类型之一,研究该场景下海上风电经柔性直流送出系统的暂态响应特性对于系统的保护方案设计有着重要参考价值。首先,分析了直流母线正极断线故障下短路电流产生机理,推导了非故障极短路电流表达式,并分析了接地阻抗参数对该短路电流特性的影响。其次,研究了故障期间风电场侧与电网侧换流站交直流侧暂态电压演变特性。研究表明:故障期间风电场侧直流电压与其有功输出正相关,且两端换流站交流阀侧电压产生了一对大小相等、方向相反的直流偏置分量;此外,采用较大的接地阻抗参数可有效降低短路电流对系统运行性能的影响。最后,基于PSCAD/EMTDC仿真平台搭建了全系统的电磁暂态仿真模型,通过仿真验证了暂态特性分析的正确性与参数选择的合理性,对于大规模海上风电经柔性直流系统并网的规划设计具有一定的指导意义。

关键词: 直流断线故障, 海上风电, 柔性直流输电, 短路电流, 暂态特性

Abstract:

DC transmission line breakage fault is one of the common types of DC faults, so research on the transient response characteristics of offshore wind power sending systems via flexible high voltage direct current (HVDC) transmission system in this scenario has important value for the protection scheme design. At first, the mechanism of short-circuit current under line breakage fault at the positive pole of the DC bus is analyzed in this paper. Furthermore, the expression of short-circuit current at the non-fault pole is derived, and the impact of ground-impedance on the characteristics of short-circuit current is considered. Secondly, the transient voltage evolution characteristics during the fault on the AC and DC sides of the converter station on the wind farm side and the grid side are studied. Results show that the DC voltage on the wind farm side is positively correlated with its active power output during the fault, and the AC-side voltage of the converter stations produce a pair of DC bias components of equal magnitude and opposite directions. In addition, it can effectively reduce the impact of short-circuit current on system operation performance if a larger ground-impedance is adopted. Finally, the electromagnetic transient model of the whole system is built on the PSCAD/EMTDC simulation platform, and the correctness of the analysis on transient characteristics and the rationality of parameter selection are verified by simulations. The work in this paper has certain guiding significance for the planning and design of large-scale offshore wind power integration with flexible HVDC transmission system.

Key words: DC line breakage fault, offshore wind power, flexible HVDC transmission system, short-circuit current, transient characteristic

中图分类号:

TM713

黄阮明, 迟永宁, 汪军, 张梦瑶, 郭明星, 李琰, 姚骏. 直流断线故障下海上风电经柔性直流送出系统的暂态特性[J]. 电力建设, 2021, 42(4): 97-104.

HUANG Ruanming, CHI Yongning, WANG Jun, ZHANG Mengyao, GUO Mingxing, LI Yan, YAO Jun. Transient Characteristics of Offshore Wind Power Sending System via Flexible HVDC Transmission System Under DC Line Breakage Fault[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(4): 97-104.

图/表 6

图1 海上风电经柔性直流送出系统结构

Fig.1 Structure of offshore wind power sending system via flexible HVDC transmission system

图2 MMC换流站的拓扑结构

Fig.2 Topology of an MMC station

图3 直流断线故障下系统放电通路

Fig.3 Discharge path under DC line breakage fault

表1 海上风电经柔性直流送出系统的仿真参数

Table 1 Simulation parameters of offshore wind power sending system via flexible HVDC transmission system

图4 直流断线故障下系统的暂态响应特性

Fig.4 Transient response characteristics of the system under DC line breakage fault

图5 不同接地阻抗参数下短路电流特性

Fig.5 Characteristics of short-circuit current under different ground-impedance

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直流断线故障下海上风电经柔性直流送出系统的暂态特性

Transient Characteristics of Offshore Wind Power Sending System via Flexible HVDC Transmission System Under DC Line Breakage Fault

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