Assessment of the MV/LV on-load tap changer technology as a way to increase LV hosting capacity for photovoltaic power generators

Rauma, Kalle; Cadoux, Florent; Hadjsaïd, Nourédine; Dufournet, Adrien; Baudot, Clément; Roupioz, Guillaume

doi:10.1049/cp.2016.0644

Cited by 15 publications

(12 citation statements)

References 3 publications

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“…The voltage set-point of MV bus-bar at PS could be controlled by OLTC through offline OPF [38]. The authors in [39] have compared a real network case study with no OLTC, five tap position on OLTC and nine tap position on OLTC. The results show that HC could be increased more than 50% in 16% scenarios and more than 100% in about 3%.…”

Section: A Voltage Controlmentioning

confidence: 99%

Hosting Capacity Analysis: A Review and a New Evaluation Method in Case of Parameters Uncertainty and Multi-Generator

Mirbagheri

Falabretti

Ilea

et al. 2018

2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Syst

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The rapid growth of distributed energy resources exploitation can cause voltage violations and overloading on distribution grids due to the uncontrolled and unprogrammable power injections associated with dispersed generators. To overcome these issues, distributed system operators have to evaluate the maximum generation that can be hosted by distribution grids without violating the technical constraints and find the ways to increase it. In this paper, different hosting capacity analyses for different case studies have been reviewed, and a novel model to evaluate hosting capacity in case of grid parameters uncertainties and multi-generator connection is proposed.

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Section: A Voltage Controlmentioning

confidence: 99%

Hosting Capacity Analysis: A Review and a New Evaluation Method in Case of Parameters Uncertainty and Multi-Generator

Mirbagheri

Falabretti

Ilea

et al. 2018

2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Syst

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“…However, most of the studies are focused on advanced control approaches where a significant amount of infrastructure upgrades and maintenances are required to secure the efficiency. The use of LV on-load tap changing (OLTC) transformers has recently been studied by several researchers in order to enhance the voltage regulation and increase the network's PV hosting capacity [21][22][23][24][25]. Typically, the OLTC transformers are installed at medium voltage (MV) networks to regulate grid voltage, while LV networks are fitted with off-load tap changing transformers where the ratio between the primary and secondary voltages of the transformer could only be adjusted after disconnecting the load.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of PV penetration at different locations in a LV distribution network connected with an off-load tap changing transformer

Almeida

Pasupuleti

Ekanayake

2021

IJEECS

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<span>Solar photovoltaic (PV) power generation has shown a worldwide remarkable growth in recent years. In order to achieve the increasing energy demand, a large number of residential PV units are connected to the low voltage (LV) distribution networks. However, high integration of solar PV could cause negative impacts on distribution grids leading to violations of limits and standards. The voltage rise has been recognized as one of the major implications of increased PV integration, which could significantly restrict the capacity of the distribution network to support higher PV penetration levels. This study addresses the performance of the off-load tap changing transformer under high solar PV penetration and a detailed analysis has been carried out to examine the maximum allowable PV penetration at discrete tap positions of the transformer. The maximum PV penetration has been determined by ensuring that all nodal voltages adhere to grid voltage statutory limits. The simulation results demonstrate that the first two tap positions could be adopted to control the grid voltage under higher PV penetrations thus facilitating further PV influx into the existing network.</span>

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“…Overvoltage and thermal overloading are the limiting factors determined and the positive impact of OLTC implementation on HC is validated. In [7], several LV networks are simulated to check the OLTC performance. The observations show the significant increase in the HC.…”

Section: Introductionmentioning

confidence: 99%

A Stochastic Assessment of PV Hosting Capacity Enhancement in Distribution Network Utilizing Voltage Support Techniques

Arshad

Lehtonen

2019

IEEE Access

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The low voltage (LV) network's constraints are prone to violations with the introduction of distributed energy resources at the customer vicinity. This study assesses the technical aspects of the realistic Finnish distribution network with varying photovoltaic (PV) penetration and quantifies the hosting capacities (HCs) of different regions. Moreover, to maximize the network's HC, having the overvoltage issue, different voltage control strategies are employed comprising on-load tap changer (OLTC), reactive power control (RPC) of inverters, network reinforcement (NR), and hybrid approaches. HC relative to different country-specific over-voltage limits are defined and the best voltage control technique is assessed, utilizing the stochastic approach of Monte Carlo simulations to model the uncertainty in the LV network's probabilistic variables. Moreover, combined medium voltage (MV)/LV network simulations are conducted to compare with the LV only simulations results. Technically, NR is the best approach to maximize the HC of a particular region but economically it is not proven a feasible one. The results presented that the OLTC employment will maximize the PV penetration if the overvoltage limit derived from EN 50160 is implemented and doubles the HC in the stricter-voltage-limits' scenarios, which can be maximized by the RPC inclusion in cohesion with OLTC. Moreover, RPC only strategy can be employed in the cases of low PV penetration scenarios, when OLTC will be proven the more expensive option. As the voltage violation limit becomes stricter, the hybrid approach of OLTC and RPC will be the best strategy. INDEX TERMS Hosting capacity, photovoltaic systems, on-load tap changer, reactive power control, distribution network.

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Assessment of the MV/LV on-load tap changer technology as a way to increase LV hosting capacity for photovoltaic power generators

Cited by 15 publications

References 3 publications

Hosting Capacity Analysis: A Review and a New Evaluation Method in Case of Parameters Uncertainty and Multi-Generator

Hosting Capacity Analysis: A Review and a New Evaluation Method in Case of Parameters Uncertainty and Multi-Generator

Performance evaluation of PV penetration at different locations in a LV distribution network connected with an off-load tap changing transformer

A Stochastic Assessment of PV Hosting Capacity Enhancement in Distribution Network Utilizing Voltage Support Techniques

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