摘要
随着分布式电源及直流负荷的发展,兼具安全、可靠、高效的交直流混合配电网将成为未来配电网发展的一种重要形式。基于电压源型换流器的直流配电网具有可控性强、电能质量问题少、经济性好等优点,但同时也引入了有别于交流配电网的潮流计算问题。为此,文章首先建立了考虑换流器损耗以及直流变换器损耗的潮流计算模型,并给出损耗参数计算方法。其次介绍了直流系统潮流模型的求解方法,重点考虑了电压源型换流器和DC/DC变换器控制方式对潮流计算的影响,针对不同的控制策略给出不同的潮流求解方法,并给出了当潮流越限时几种有效的解决措施。最后利用IEEE 33节点直流配电网算例验证了提出的损耗模型的正确性和潮流求解方法的有效性。
With the development of distributed generation and DC loads,a safe,reliable,and efficient AC-DC hybrid distribution network will become an important form for future development of distribution network.The DC distribution network based on the voltage source converter has the advantages of strong controllability,fewpower quality problems,and good economy.At the same time,it also introduces a problem of power flowcalculation that is different from the AC distribution network.This paper firstly establishes a model for power flowcalculation that takes into account inverter losses and DC converter losses,and gives calculation method for loss parameters.Secondly,the method for solving the DC power flowmodel is introduced.When analyzing the power flowof the DC system,the influence of control method of the voltage source converter and the DC/DC converter on the power flowcalculation is mainly considered.Different power flowsolving methods are given for different control strategies.Several effective solutions are given when the flowexceeds the limit.Finally,an IEEE 33-node DC distribution network example is used to verify the correctness of the loss model proposed in this paper and the effectiveness of the power flowsolution method.
作者
王肖肖
韩民晓
曹文远
谢文强
肖峰
李蕊
秦剑华
WANG Xiaoxiao;HAN Minxiao;CAO Wenyuan;XIE Wenqiang;XIAO Feng;LI Rui;QIN Jianhua(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Beijing 102206,China;China Electric Power Research Institute,Beijing 100192,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China)
出处
《电力建设》
北大核心
2020年第10期38-46,共9页
Electric Power Construction
基金
国家重点研发计划项目(2018YFB0904700)。
