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- PublicationMinimum cost curtailment for distributed generation voltage managementThe penetration of DG is increasing on distribution networks across the world. As a result, networks are being pushed closer to their operating limits. In particular, voltage rise has been identified as a key barrier to further DG capacity. Active management of the voltage constraint may be possible, leading to a form of constraint management at distribution level for the first time. Here a novel method is proposed, which minimises the cost of curtailment. It takes advantage of the dispatchable capability of certain forms of DG, such as biomass, hydro or landfill gas. There are a number of well established methods for congestion management on the transmission network. A number of these are applied to voltage management on the distribution network and used for comparison with the new minimum cost method. The variability of voltage sensitivities andmarket prices is also investigated, with their impact on the cost of curtailment quantified.
- PublicationPlanning and operating non-firm distributed generationThe penetration of Distributed Generation (DG) is increasing on distribution networks across the world. Non-ﬁrm access to the network is now being proposed as a cost eﬀective way to facilitate DG. However, concerns remain about the operational details of non-ﬁrm access and also with regard to the ﬁnancing of DG projects, which, by their nature, are not guaranteed permission to export power at all times. Here, the pertinent operational issues that arise with non-ﬁrm access are analysed. The index of coincidence is used to assess the probability of constraint breaches, through analysis of historical generation and load proﬁles. Further to this, a novel method is proposed, which minimises the cost to the generators of non-ﬁrm access through coordinated operation.
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