A control strategy for the management of islanded networks with renewables and storage systems

Bignucolo, Fabio; Raciti, A.; Caldon, Roberto

doi:10.1109/upec.2014.6934752

Cited by 10 publications

(2 citation statements)

References 8 publications

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“…In detail, a Phase Locked Loop (PLL) installed on the generator Point of Delivery (PoD) measures the network frequency f and the reference voltage angle ϕ V required to correctly drive the power electronic converter synchronizing it with the main grid [36,37]. The signal f is used by the block P-f droop to define the PCR active power contribution required to the overall plant ∆P, according to the droop curve ( Figure 2) and taking into account which of the hydroelectric units are effectively in operation (O x , with x = 1, .…”

Section: Dynamic Behaviour Of the Hybrid Plantmentioning

confidence: 99%

Integration of Lithium-Ion Battery Storage Systems in Hydroelectric Plants for Supplying Primary Control Reserve

et al. 2017

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Abstract:The ever-growing diffusion of renewables as electrical generation sources is forcing the electrical power system to face new and challenging regulation problems to preserve grid stability. Among these, the primary control reserve is reckoned to be one of the most important issues, since the introduction of generators based on renewable energies and interconnected through static converters, if relieved from the primary reserve contribution, reduces both the system inertia and the available power reserve in case of network events involving frequency perturbations. In this scenario, renewable plants such as hydroelectric run-of-river generators could be required to provide the primary control reserve ancillary service. In this paper, the integration between a multi-unit run-of-river power plant and a lithium-ion based battery storage system is investigated, suitably accounting for the ancillary service characteristics as required by present grid codes. The storage system is studied in terms of maximum economic profitability, taking into account its operating constraints. Dynamic simulations are carried out within the DIgSILENT PowerFactory 2016 software environment in order to analyse the plant response in case of network frequency contingencies, comparing the pure hydroelectric plant with the hybrid one, in which the primary reserve is partially or completely supplied by the storage system. Results confirm that the battery storage system response to frequency perturbations is clearly faster and more accurate during the transient phase compared to a traditional plant, since time delays due to hydraulic and mechanical regulations are overpassed. A case study, based on data from an existing hydropower plant and referring to the Italian context in terms of operational constraints and ancillary service remuneration, is presented.

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Section: Dynamic Behaviour Of the Hybrid Plantmentioning

confidence: 99%

Integration of Lithium-Ion Battery Storage Systems in Hydroelectric Plants for Supplying Primary Control Reserve

et al. 2017

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“…In the case of DGs, the new power regulation strategies have been demonstrated to support network stability during steady-state regimes and to contribute in intentional islanding management (e.g., planned disconnection from the main grid or islanded power systems) [10][11][12][13]. Nevertheless, dangerous conditions could be experienced by the distribution system during transients, potentially leading to unintentional islanding phenomena, due to the masking effect of stabilizing functions on IPSs, causing the anti-islanding protection failure [14][15][16][17][18][19][20].…”

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confidence: 99%

Effects of Energy Storage Systems Grid Code Requirements on Interface Protection Performances in Low Voltage Networks

Bignucolo

Cerretti²,

Coppo

et al. 2017

Energies

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Abstract:The ever-growing penetration of local generation in distribution networks and the large diffusion of energy storage systems (ESSs) foreseen in the near future are bound to affect the effectiveness of interface protection systems (IPSs), with negative impact on the safety of medium voltage (MV) and low voltage (LV) systems. With the scope of preserving the main network stability, international and national grid connection codes have been updated recently. Consequently, distributed generators (DGs) and storage units are increasingly called to provide stabilizing functions according to local voltage and frequency. This can be achieved by suitably controlling the electronic power converters interfacing small-scale generators and storage units to the network. The paper focuses on the regulating functions required to storage units by grid codes currently in force in the European area. Indeed, even if such regulating actions would enable local units in participating to network stability under normal steady-state operating conditions, it is shown through dynamic simulations that they may increase the risk of unintentional islanding occurrence. This means that dangerous operating conditions may arise in LV networks in case dispersed generators and storage systems are present, even if all the end-users are compliant with currently applied connection standards.

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Remote islanded distribution networks supplied by BESS integrated PV generation units

Abusief

Caldon

Bignucolo

2016

2016 IEEE 16th International Conference on Environment and Electrical Engineering (EEEIC)

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In some countries, electrical distribution lines have to cross areas where the installation cost could be very high and carrying out maintenance could become extremely difficult (e.g. desert areas). As a result, frequent power disconnections and blackout heavily affect the quality of supply of end-users. Oppositely, the renewable energy sources exploitation in supplying portions of the distribution network during system disconnections is very interesting, both for reducing fossil fuel use and as backup power generator. In case the islanded local electrification makes use of discontinuous and unpredictable energy sources such as photovoltaic, a Battery Energy Storage System is required to regulate the system, supplying power balance and voltage stability. In the paper, a stand-alone distribution network, corresponding in size to a typical Libyan oasis-village, has been developed and analysed. A photovoltaic generator locally supplies the islanded network, while an integrated BESS provides the daily energy balance and the system stability. The research examines the effectiveness of the proposed control strategy, developed with the scope of coordinating the role of both the solar generation and the energy storage system in facing active and reactive power requirements of the connected loads. Specific algorithms are introduced to define the optimal electrical operating condition in terms of voltage and frequency. Power system simulations demonstrate the control strategy strengths in terms of stability and time of response. Quality of supply, evaluated in terms of frequency deviations and voltage profiles, remains considerably high also considering different scenarios and introducing quick load variations. Finally, a brief investigation on integrating photovoltaic, storage and traditional generators (making use of fossil fuels) is presented

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A control strategy for the management of islanded networks with renewables and storage systems

Cited by 10 publications

References 8 publications

Integration of Lithium-Ion Battery Storage Systems in Hydroelectric Plants for Supplying Primary Control Reserve

Integration of Lithium-Ion Battery Storage Systems in Hydroelectric Plants for Supplying Primary Control Reserve

Effects of Energy Storage Systems Grid Code Requirements on Interface Protection Performances in Low Voltage Networks

Remote islanded distribution networks supplied by BESS integrated PV generation units

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