Voltage control in active distribution networks

Zarco-Soto, Fco. Javier; Martínez-Ramos, José L.; Zarco-Periñán, Pedro J.

doi:10.1016/b978-0-12-823346-7.00003-7

Cited by 2 publications

(4 citation statements)

References 17 publications

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“…However, only considering active power is intrinsically inefficient, since it affects energy and, consequently, end-users directly. As demonstrated in [10], in distribution levels voltage depends on both active and reactive power, due to the resistance and reactance components of lines, which also depend on the voltage level of the network [24]. Through volt/var controls, reactive power can then be used to reduce the use of active power and thus energy; i.e., using DRES or PEV chargers to inject reactive power increases the voltage for preventing undervoltage, whereas reactive power consumption reduces voltage and prevents overvoltage.…”

Section: Review Of Strategies For Voltage Controlmentioning

confidence: 84%

“…Traditional distribution networks were based on having only passive loads connected, thus making power flows unidirectional and with the voltage profile always descending due to voltage drop. Based on these assumptions, distribution networks were normally controlled through OLTC transformers, voltage regulators, and capacitor banks [10,15]. However, disperse generation results in bidirectional power flows, and the voltage at nodes where DRES are connected increases.…”

Section: Centralized Control Strategies In Distribution Networkmentioning

confidence: 99%

“…As depicted in Figure 3, introducing DRES along the system makes the voltage profile become irregular, which could lead to overvoltage at certain nodes within the feeder, even if voltage at a MV substation is within bounds. As addressed in [10], presence of DRES can be considered as a net demand reduction if near loads still consume more power than DRES generate, provided no congestion arises. On the contrary, if generation is larger than consumption, the impact will depend on the relative position of the DRES with respect to loads, the state of the system, and the location within the feeder.…”

Section: Centralized Control Strategies In Distribution Networkmentioning

confidence: 99%

“…In this way, efficient controls to manage vehicle charging and discharging are being developed to help increasing PEV integration. Distribution networks have been traditionally planned and operated under the socalled fit-and-forget premise [10]. Operation was mainly determined during the planning stage by the adequate sizing of conductors, transformers, and equipment, according to the current and forecasted power demand.…”

Section: Introductionmentioning

confidence: 99%

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Centralized Control of Distribution Networks with High Penetration of Renewable Energies

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Distribution networks were conceived to distribute the energy received from transmission and subtransmission to supply passive loads. This approach, however, is not valid anymore due to the presence of distributed generation, which is mainly based on renewable energies, and the increased number of plug-in electric vehicles that are connected at this voltage level for domestic use. In this paper the ongoing transition that distribution networks face is addressed. Whereas distributed renewable energy sources increase nodal voltages, electric vehicles result in demand surges higher than the load predictions considered when planning these networks, leading to congestion in distribution lines and transformers. Additionally, centralized control techniques are analyzed to reduce the impact of distributed generation and electric vehicles and increase their effective integration. A classification of the different methodologies applied to the problems of voltage control and congestion management is presented.

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Section: Review Of Strategies For Voltage Controlmentioning

confidence: 84%

Section: Centralized Control Strategies In Distribution Networkmentioning

confidence: 99%

Section: Centralized Control Strategies In Distribution Networkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Centralized Control of Distribution Networks with High Penetration of Renewable Energies

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A Novel Formulation to Compute Sensitivities to Solve Congestions and Voltage Problems in Active Distribution Networks

2021

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Sensitivities are broadly appreciated because of its simplicity and good results in solving voltage problems and congestions in transmission networks. However, since sensitivity calculation is based on a linear approximation of the power flow equations, all decisions commit an intrinsic error that might lead into unexpected results, especially in distribution networks. This paper analyzes the error associated to sensitivities considering a wide range of control variables and proposes a novel formulation to extend the use of sensitivities to manage congestions in active distribution networks. First, a theoretical analysis is performed to study the origin and propagation of errors. Then, numerical results are presented for two types of distribution networks (20 kV and low voltage grids). Finally, a novel formulation is proposed to extend the use of sensitivities to manage congestions, which will allow to reuse previous sensitivity-based methodologies to solve both voltage problems and congestions in active distribution networks.

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Voltage control in active distribution networks

Cited by 2 publications

References 17 publications

Centralized Control of Distribution Networks with High Penetration of Renewable Energies

Centralized Control of Distribution Networks with High Penetration of Renewable Energies

A Novel Formulation to Compute Sensitivities to Solve Congestions and Voltage Problems in Active Distribution Networks

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