摘要
在中国“碳达峰、碳中和”目标的驱动下,电力系统向着低碳清洁、高效智能的方向发展。当大规模可再生能源接入电力系统后,现有电力网络出现了传输能力不足的问题。分频输电系统采用较低频率输送电能,相比同电压等级的工频系统,其线路输送能力得到大幅度提升,目前已经在包含中远距离海上风电,“沙戈荒”偏远地区陆上风电、光伏发电和大规模水电输送等在内的可再生能源高效汇集送出领域受到广泛关注。为此,首先介绍了分频输电的基本原理并概述了核心变频设备的运行特性。在高比例可再生能源接入与高比例电力电子设备应用的“双高”背景下,进一步从系统稳态运行和故障穿越两个方面,综合阐述了“点对点”双端和多端互联分频输电系统的运行特性以及控制策略的典型设计方法。最后,就分频输电系统运行控制研究中需要进一步结合的输电频率经济性优选,小/大干扰系统稳定性分析和城市电网扩容改造等问题进行了展望。
Driven by the goal of“carbon peak and carbon neutrality”in China,the power system of China is developing in the direction of low carbon,clean,efficient and intelligent operation.When large-scale renewable energy is connected to the power system,the existing power network has the problem of insufficient transmission capacity.The frequency division transmission system uses lower frequency to transmit electric energy.Compared with the power frequency system of the same voltage level,the line transmission capacity has been greatly improved.At present,it has been widely concerned in the field of efficient collection and transmission of renewable energy,including medium and long-distance offshore wind power,onshore wind power,photovoltaic power generation and large-scale hydropower transmission in remote areas.This paper first introduces the basic principle of frequency division transmission and summarizes the operating characteristics of the core frequency conversion equipment.Under the“double high”background of high proportion of renewable energy access and high proportion of power electronic equipment applications,the operating characteristics and typical design methods of control strategies of point-to-point two-terminal and multi-terminal interconnected frequency-division transmission systems are further elaborated from the aspects of system steady-state operation and fault ride-through.Finally,the prospects in issues are put forward that need to be further combined in the research of frequency division transmission system operation control,such as economic optimization of transmission frequency,stability analysis of small and large interference system,and expansion and transformation of urban power grid.
作者
王秀丽
段子越
孟永庆
赵勃扬
张海涛
宁联辉
丁超
WANG Xiuli;DUAN Ziyue;MENG Yongqing;ZHAO Boyang;ZHANG Haitao;NING Lianhui;DING Chao(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;State Grid Zhejiang Electric Power Co.,Ltd.,Research Institute,Hangzhou 310000,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2023年第9期3696-3707,共12页
High Voltage Engineering
基金
国家重点研发计划(2021YFB2401100)
国家电网有限公司科技项目(5211DS22002C)。
关键词
分频输电系统
模块化多电平
交交变频器
运行特性
控制策略
多端分频互联系统
fractional frequency transmission system
modular multi-level
cycloconverter
operating characteristics
control strategy
multi-terminal fractional frequency interconnected system
