Encouraged by the increasing electric energy consumption, the distributed generation has been widely included in the electrical power system. However, renewable energy resources have intermittent characteristics. When the distributed generation is high at certain times of the day, the energy generation at distribution systems can become higher than the required power. The surplus energy is returned to the transmission system, giving rise to active distribution networks. This paper proposes an approach to optimally managing the existing distributed generation and voltage control devices. The management is performed by solving an optimal power flow problem, aiming to find an operating condition for the system in which the losses are minimized, and the voltage profiles are improved. A combined transmission and distribution system is proposed. Some scenarios are considered to assess the impact of distributed generation insertion and the contribution of these sources in support of reactive power. The results indicate the need for adequate active distribution networks management, which depends on the distribution generation insertion level and the generation sources’ power factor.

由于电能消耗的增加，分布式发电已广泛地包含在电力系统中。但是，可再生能源具有间歇性的特征。当一天中的某些时候分布式发电量很高时，配电系统的发电量可能会高于所需的功率。多余的能量返回到传输系统，从而形成了有源配电网。本文提出了一种对现有分布式发电和电压控制设备进行最佳管理的方法。通过解决最佳功率流问题来执行管理，目的是找到该系统的工作条件，在该条件下损耗最小，并且电压曲线得到改善。提出了一种组合的输配电系统。考虑了一些方案，以评估分布式发电接入的影响以及这些源对支持无功功率的贡献。结果表明需要适当的有源配电网管理，这取决于配电发电插入水平和发电源的功率因数。