考虑电压暂降影响的交直流配网优选

Optimization scheme of AC/DC distribution network considering voltage sags

直流配网作为一种新型的配电结构,适用场景的规划需要与交流配网进行可靠性、经济性的详尽对比。考虑到近年来电压暂降问题越发突出,首先研究直流配电网在缓解敏感用户电压暂降问题中的作用。以此为基础,综合考虑经济性和可靠性,建立交直流配电网的全生命周期成本模型,结果表明,在直流负荷占比50%的情况下,尽管直流配电网在可靠性和初始投资方面不占优势,但较低的损耗成本以及缓解电压暂降损失的能力使得其全生命周期成本优于交流配电网。在此基础上,进一步提出针对不同直流负荷占比、电力电子器件故障率条件下的交直流配电网优选方法。

As a new scheme of the distribution networks,the DC distribution network should be compared in detail with the AC distribution network in planning and design stage.Mean while,the voltage sags problems are also dominated in resent years.Under this circumstance,this paper studies the effect of DC distribution network which can relieve voltage sags occurs of the sensitive customers.Then,the life cycle cost(LCC)model of AC/DC distribution network is established by considering the economic and reliability impacts.It is shown that,in the case of 50%DC loads,even the DC distribution network has more initial cost and lower reliability,the LCC of DC distribution networks is better due to its ability to mitigation voltage sags and less loss.At last,the optimization method of AC/DC distribution network under different DC load ratios and power electronic device failure rate is proposed.