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Integration of distributed energy resources on distribution and transmission systems
The power system has been undergoing a significant transformation over the last two decades. The rising share of renewable production, and the gradual decommissioning of conventional power plants, creates a need for alternative providers of power system services. This need, along with the increasing presence and control capabilities of Distributed Energy Resources (DERs), calls for the seamless integration of these resources in power system operation. This thesis deals with issues related to the integration of DERs in the power system. The presented work can be broadly divided into two main areas. The first part deals with how the requirements of the provided services, and the level of available information, affect the way a DER aggregator models and controls its portfolio. The second part deals with congestion management at a Distribution Network (DN) level, where two fundamentally different approaches are investigated and their key differences are highlighted. At a system level, Primary Frequency Control (PFC) is an important ancillary service, crucial for power system stability. Decentralized PFC provision offers robustness to failures, scalability, and reduction of communication requirements. However, existing decentralized PFC methods do not address the problems of reduced efficiency, increased switching actions, and performance guarantees under such a setup. Here, a decentralized control policy that addresses the aforementioned issues is proposed. By appropriate tuning, the desired trade-off between these three objectives can be achieved. As DERs gradually become the main providers of PFC, understanding their dynamic response becomes critical. In this thesis, limitations of existing models of aggregated Electric Vehicle (EV) dynamics are investigated. It is shown that in many cases these lead to significant approximation errors. More accurate, yet still simple, models are proposed, which can decrease these errors, providing models suited for power system frequency dynamics studies. As a potential source of ...
Integration of distributed energy resources on distribution and transmission systems
The power system has been undergoing a significant transformation over the last two decades. The rising share of renewable production, and the gradual decommissioning of conventional power plants, creates a need for alternative providers of power system services. This need, along with the increasing presence and control capabilities of Distributed Energy Resources (DERs), calls for the seamless integration of these resources in power system operation. This thesis deals with issues related to the integration of DERs in the power system. The presented work can be broadly divided into two main areas. The first part deals with how the requirements of the provided services, and the level of available information, affect the way a DER aggregator models and controls its portfolio. The second part deals with congestion management at a Distribution Network (DN) level, where two fundamentally different approaches are investigated and their key differences are highlighted. At a system level, Primary Frequency Control (PFC) is an important ancillary service, crucial for power system stability. Decentralized PFC provision offers robustness to failures, scalability, and reduction of communication requirements. However, existing decentralized PFC methods do not address the problems of reduced efficiency, increased switching actions, and performance guarantees under such a setup. Here, a decentralized control policy that addresses the aforementioned issues is proposed. By appropriate tuning, the desired trade-off between these three objectives can be achieved. As DERs gradually become the main providers of PFC, understanding their dynamic response becomes critical. In this thesis, limitations of existing models of aggregated Electric Vehicle (EV) dynamics are investigated. It is shown that in many cases these lead to significant approximation errors. More accurate, yet still simple, models are proposed, which can decrease these errors, providing models suited for power system frequency dynamics studies. As a potential source of ...
Integration of distributed energy resources on distribution and transmission systems
Ziras, Charalampos (Autor:in)
01.01.2019
Ziras , C 2019 , Integration of distributed energy resources on distribution and transmission systems . Technical University of Denmark .
Buch
Elektronische Ressource
Englisch
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