中压配电网柔性互联示范工程技术方案设计

doi:10.12204/j.issn.1000-7229.2022.03.001

电力建设 ›› 2022, Vol. 43 ›› Issue (3): 1-11.doi: 10.12204/j.issn.1000-7229.2022.03.001

• 新型电力系统下配电网规划与运行优化关键技术研究及应用·栏目主持王守相教授、赵倩宇博士· • 上一篇下一篇

中压配电网柔性互联示范工程技术方案设计

魏志文¹, 罗煜¹, 曾远方¹, 赵彪², 崔康生³(), 李海波³, 施健³

1.广东电网有限责任公司东莞供电局, 广东省东莞市 523109
2.清华大学电机工程与应用电子技术系,北京市100084
3.清华四川能源互联网研究院直流研究中心,成都市 610213

收稿日期:2021-09-23 出版日期:2022-03-01 发布日期:2022-03-24
作者简介:魏志文(1975),男,硕士,高级工程师,主要研究方向为电气工程建设管理;
罗煜(1982),男,硕士,高级工程师,主要研究方向为电网规划、调度;
曾远方(1990),女,硕士,工程师,主要研究方向为电气工程及其自动化;
赵彪(1987),男,博士,副教授,主要研究方向为柔性直流输配电、大功率电力电子技术;
崔康生(1992),男,硕士,主要研究方向为直流电网系统设计与分析、电力系统计算与仿真,E-mail: cuikangsheng@tsinghua-eiri.org;
李海波(1990),男,博士,助理研究员,主要研究方向为可再生能源并网、柔性电力系统等;
施健(1987),男,博士,高级工程师,主要研究方向为过电压与绝缘配合技术。
基金资助:
东莞松山湖中压配电网柔性互联示范项目(031986WP20200031)

Technical Scheme Design of an MVAC Distribution Network Project for Demonstration with MVDC-Flexible Interconnection

WEI Zhiwen¹, LUO Yu¹, ZENG Yuanfang¹, ZHAO Biao², CUI Kangsheng³(), LI Haibo³, SHI Jian³

1. Dongguan Power Supply Bureau of Guangdong Power Grid Co., Ltd., Dongguan 523109, Guangdong Province, China
2. Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
3. DC Research Center, Sichuan Energy Internet Research Institute, Tsinghua University, Chengdu 610213, China

Received:2021-09-23 Online:2022-03-01 Published:2022-03-24
Supported by:
Dongguan Songshanhu Lake Medium Voltage Distribution Network Flexible Interconnection Demonstration Project(031986WP20200031)

摘要/Abstract

摘要：

结合东莞松山湖地区中压配电网的实际问题和工程示范规划,对中压柔性直流互联在该地区中压配电网中的应用方案进行研究。对系统的主接线方式、联接变压器配置和接地方式进行了论证;对系统中模块化多电平换流器和电力电子直流变压器进行了初步设计,确定了关键设备主要技术要求;仿真分析了系统过电流和过电压特性,提出了系统的过流耐受和绝缘配合要求;设计了系统总体控制架构和保护配置,明确了系统的控制保护策略。文章对示范工程所采用的新型主回路拓扑进行了论证,提出并采用了高纹波紧凑化的设备设计方案,提出了交流故障协调响应策略,并对这些新技术进行了论证和仿真验证,可为后续相关研究和工程实践提供参考。

关键词: 中压柔性互联, 示范工程, 系统分析, 模块化多电平换流器(MMC), 电力电子直流变压器

Abstract:

Combined with the actual problems of the medium-voltage (MV) AC distribution network in Songshan Lake area of Dongguan, the technical scheme of an MVAC distribution network project for demonstration with HVDC-flexible interconnection is studied. The main wiring mode, connection transformer configuration and grounding mode are demonstrated. The modular multi-level converter and power electronic DC transformer in the system are preliminarily designed, and the technical requirements for key equipment are determined. The system overcurrent and overvoltage characteristics are analyzed by simulation, thus overcurrent tolerance and insulation coordination requirements being put forward. The overall control architecture and protection configuration of the system are designed, and the control and protection strategy of the system is defined. The new main connection topology proposed in this article is used in a practical demonstration project. The scheme of high-ripple design for compact equipment is adopted and the AC fault coordination response strategy is proposed. All those new technologies are demonstrated and verified with simulation, which provide reference for follow-up related research and engineering practice.

Key words: MVDC-flexible interconnection, demonstration project, system analysis, modular multilevel converter (MMC), power electronic DC transformer

中图分类号:

TM72

魏志文, 罗煜, 曾远方, 赵彪, 崔康生, 李海波, 施健. 中压配电网柔性互联示范工程技术方案设计[J]. 电力建设, 2022, 43(3): 1-11.

WEI Zhiwen, LUO Yu, ZENG Yuanfang, ZHAO Biao, CUI Kangsheng, LI Haibo, SHI Jian. Technical Scheme Design of an MVAC Distribution Network Project for Demonstration with MVDC-Flexible Interconnection[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(3): 1-11.

图/表 15

图1 东莞松山湖中压配电网柔性互联示范项目

Fig.1 MVAC distribution network project for demonstration with MVDC-flexible interconnection in Dongguan Songshan Lake area

图2 示范工程主回路拓扑结构

Fig.2 Topology of the demonstration project

图3 不同联接变压器配置方案单相故障仿真波形

Fig.3 Single-phase fault simulation results of different transformer configurations

图4 不同运行模式下主回路接地方式

Fig.4 Grounding methods of main circuit under different operation modes

图5 不同直流接地电阻下交流单相短路电流波形

Fig.5 Single-phase short-circuit current under different DC grounding resistance

图6 MMC结构示意图

Fig.6 Structural sketch of MMC

表1 MMC技术指标要求

Table 1 Technical requirements of MMC

图7 DCT结构示意图

Fig.7 Structural sketch of DCT

表2 DCT技术指标要求

Table 2 Technical requirements of DCT

表3 系统过流耐受要求

Table 3 System current withstand requirementskA

表4 系统绝缘配合要求

Table 4 Requirements for system insulation coordinationkV

图8 示范工程控制系统框图

Fig.8 Control system block diagram of thedemonstration project

图9 系统运行模式转换关系

Fig.9 Transition relationship of system operation modes

图10 MMC保护功能配置

Fig.10 Relaying protection functions of MMC

图11 DCT保护功能配置

Fig.11 Relaying protection functions of DCT

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中压配电网柔性互联示范工程技术方案设计

Technical Scheme Design of an MVAC Distribution Network Project for Demonstration with MVDC-Flexible Interconnection

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