Using Distributed Generation to Support and Provide Ancillary Services for the Power System

The contribution of small distributed generation (DG) in power generation is significant nowadays. The influence of DG on the system operation protocol is increasing with the increase of the DG penetration level in the power system. However, DG is still treated as negative load. How to use it in an active way is still an open question. DG is not only playing an important role in power generation, but also can be a source providing ancillary services. This paper gives general discussions how to use DG to provide ancillary services. Due to the local connection and near consumers, the contribution of DG is significant with local control variables such as voltage regulation or power loss reduction.