Abstract
Due to the interconnection and active management of Distributed Generation (DG) and Energy Storage Systems (ESSs), the traditional electrical distribution network has become an Active Distribution Network (ADN), posing challenges to the operation optimization of the network. The power supply and storage capacity indexes of a Local Autonomy Control Region (LACR), which consists of DGs, ESSs and the network, are proposed in this paper to quantify the power regulating range of a LACR. DG/ESS and the network are considered as a whole in the model of the indexes, considering both network constraints and power constraints of the DG/ESS. The index quantifies the maximum LACR power supplied to or received from ADN lines. Similarly, power supply and storage capacity indexes of the ADN line are also proposed to quantify the maximum power exchanged between ADN lines. Then a practical algorithm to calculate the indexes is presented, and an operation optimization model is proposed based on the indexes to maximum the economic benefit of DG/ESS. In the optimization model, the power supply reliability of the ADN line is also considered. Finally, the indexes of power supply and storage capacity and the optimization are demonstrated in a case study.
Highlights
Various kinds of renewable energy have been so far integrated into electrical power distribution networks in the form of Distributed Generation (DG) systems to reduce societys’ dependence on fuel resources
The positive direction of the power supply capacity of the Local Autonomy Control Region (LACR) is defined as power injected into the Active Distribution Network (ADN) line, while that of the power storage capacity is defined as power received from the ADN
Since the operation is subject to both DG’s/Energy Storage Systems (ESSs)’s electrical specifications and network constraints, the complexity of the operation optimization of an ADN is greatly increased with the number of DGs/ESSs
Summary
Various kinds of renewable energy have been so far integrated into electrical power distribution networks in the form of Distributed Generation (DG) systems to reduce societys’ dependence on fuel resources. Abundant research have been done on the active management and operation optimization of grid-connected DGs/ESSs. Some forms of renewable energy, e.g., wind generation and photovoltaic arrays, etc., are intermittent and increase the fluctuation of the net load of the ADN lines. The power supply & storage capacity index of the LACR is proposed to quantify the maximum power regulation range of the LACR, considering both the DG/ESS power constraints and the network restrictions. Practical algorithms are used to calculate the power supply and storage indexes, and an operation optimization model of an ADN line based on the indexes is proposed to maximize the economic benefits of DG/ESS. The power supply and storage capacity of the LACR is defined as the maximum export/import real power of the LACR, considering power constraints of DGs/ESSs as well as any restrictions of node voltage and maximum branch current. The power constraints of DGs/ESSs, node voltage restrictions, branch current and SOC of ESSs are considered in the calculation of the capacity, as discussed below
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