Influence Rules and Mechanism Analysis of Distribution Network Flexibility Degree on Distributed Generator Accommodation
梁海深 1王康丽 1宋红宇 1郝金娜 1肖峻2
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作者信息
1. 国网天津市电力公司宝坻供电分公司,天津 301800
2. 天津天大求实电力新技术股份有限公司,天津 300392
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摘要
电力电子柔性化和分布式发电(DG)消纳是配电网研究的 2 个热点问题,揭示了配电网柔性度对DG消纳的影响规律和机理.首先,介绍了配电网柔性度的概念,并改进了柔性度的定义.然后,以典型接线模式和IEEE RBTS-Bus4扩展算例为研究对象,观察随柔性度升高时DG消纳率的变化,并分析规律和机理.研究发现,配电网柔性化并非都能提升DG消纳,存在一个起效条件:智能软开关(soft open point,SOP)某一侧馈线存在DG相对负荷的盈余,同时另一侧存在DG缺额.然而满足起效条件后,消纳率和柔性度之间的规律性仍未显现.提出分析消纳提升限制条件和按SOP安装次序观察的 2 种方法,发现了隐藏的规律:当存在消纳提升可用空间且无SOP容量限制下,或者同一SOP安装次序下,柔性度和消纳率才具有正相关关系.发现的规律机理为指导配电网的柔性化发展和DG消纳提供了新的理论依据.
Abstract
Two hot topics in distribution network research are power electronics flexibility and distributed generator(DG)accommodation.This paper revealed the influence rules and their mechanisms of distribution network flexibility degree on DG accommodation.Firstly,the concept of distribution network flexibility degree was introduced,and its definition was improved.Then,by taking typical wiring modes and the expanded IEEE RBTS-Bus4 test system as the research objects,the change in the DG accommodation ratio was observed as the flexibility degree started from 0,and the rules and mechanisms were analyzed.The results show that not all distribution network flexibility can improve DG accommodation,and there is an effective condition.In other words,there is a surplus of DG relative load in the feeder on one side of the soft open point(SOP)and a DG shortage on the other side.However,the regularity between the DG accommodation ratio and flexibility degree doesn't appear after the effective condition is met.This paper thus proposes two approaches,namely analyzing the restriction conditions of DG accommodation increase and observing SOP installation order,and finds the hidden rules:The flexibility degree and DG accommodation ratio have a positive correlation when there is available space for DG accommodation increase,without the SOP capacity restriction,or when they are in the same SOP installation order.The rules and mechanisms found in this paper provide a new theoretical basis for guiding the flexible development and DG accommodation of distribution networks.
关键词
配电网/柔性度/智能软开关/分布式发电/消纳/规律/机理
Key words
distribution network/flexibility degree/soft open point/distributed generator/accommodation/rule/mechanism
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