Voltage Control in PV-Rich LV Networks Without Remote Monitoring

Procopiou, Andreas T.; Ochoa, Luis F.

doi:10.1109/tpwrs.2016.2591063

Cited by 69 publications

(38 citation statements)

References 18 publications

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“…In [49], the effectiveness of the voltage control method in an OLTC transformer receiving information on the voltage level deep in the network based on estimated data was examined. An algorithm for voltage estimation with consideration of generation and load uncertainty using Monte Carlo simulations in time series was presented.…”

Section: Voltage Control In the Transformer Oltcmentioning

confidence: 99%

A Review of Voltage Control Strategies for Low-Voltage Networks With High Penetration of Distributed Generation

Janiga

2020

IAPGOS

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Deterioration of voltage conditions is one of the frequent consequences of connecting an increasing number of photovoltaic sources to the low-voltage (LV) power grid. Under adverse conditions, i.e. low energy consumption and high insolation, microgeneration can cause voltage surges that violate acceptable limits. Research shows that the increase in voltage is the main limitation for connecting new energy microsources to the LV network and forces the reconstruction of the network. An alternative to costly modernizations can be the implementation of appropriate strategies for controlling network operation to maintain the voltage at the required level. The article presents an overview of the methods and concepts of voltage control in a low-voltage network developed so far to mitigate the undesirable phenomenon of voltage boosting. The focus was mainly on local methods—not requiring communication infrastructure—as best suited to the conditions of Polish distribution networks. Gathering the results of many tests and simulations carried out in different conditions and on different models allowed for the formulation of general conclusions and can be a starting point for further research on a control method that can be widely used in the national power system.

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Section: Voltage Control In the Transformer Oltcmentioning

confidence: 99%

A Review of Voltage Control Strategies for Low-Voltage Networks With High Penetration of Distributed Generation

Janiga

2020

IAPGOS

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“…For LV levels, in practice, most utilities with a European-style network design use only the secondary distribution transformers equipped with off-load tap changers to control voltages. Once again, the use of both the traditional and novel MV volt/var control solutions mentioned above has been intensively proposed in the most current literature, but it is not applied in practice [20][21][22][23][24][25][26][27][28][29][30][31]. The use of OLTC transformers in secondary distribution substations is currently the closest to realizing an LV reality [19,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the technology, two different methods of operating an OLTCST are possible: (1) a synchronized tap change among the three phases or (2) decoupled control [32]. Most previous works have dealt with uniform and common tap positions for all three phases of the MV/LV-controlled transformer (3P-OLTCST) [19][20][21]28,30,31,[33][34][35], but increasingly, more tap position settings among transformer phases are being proposed (1P-OLTCST) [24,25,29,32,36]. Decoupled control is obviously a great deal more attractive for LV networks because of their unbalanced nature.…”

Section: Introductionmentioning

confidence: 99%

“…Regardless of whether uniform or non-uniform phase tap movements are employed, there are two main methodologies for fulfilling voltage control: rule-based approaches or analytical solutions. Among the first group, different levels of "intelligence" have been proposed to reach a global solution that is as close as possible to the optimal one [21,24,28,32]. Analytical approaches are integrated solutions that solve an optimization problem to determine the best control actions that both minimize an objective function and fulfill all the electrical constraints [29,30,36].…”

Section: Introductionmentioning

confidence: 99%

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Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

2019

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Voltage control in active distribution networks must adapt to the unbalanced nature of most of these systems, and this requirement becomes even more apparent at low voltage levels. The use of transformers with on-load tap changers is gaining popularity, and those that allow different tap positions for each of the three phases of the transformer are the most promising. This work tackles the exact approach to the voltage optimization problem of active low-voltage networks when transformers with on-load tap changers are available. A very rigorous approach to the electrical model of all the involved components is used, and common approaches proposed in the literature are avoided. The main aim of the paper is twofold: to demonstrate the importance of being very rigorous in the electrical modeling of all the components to operate in a secure and effective way and to show the greater effectiveness of the decoupled on-load tap changer over the usual on-load tap changer in the voltage regulation problem. A low-voltage benchmark network under different load and distributed generation scenarios is tested with the proposed exact optimal solution to demonstrate its feasibility.

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“…In order to solve voltage problems resulting from high penetration of VDG on distribution systems, various advanced control methods have been proposed. Several researchers applied rule-based control of OLTCs by replacing local busbar voltage with voltage measurements or estimates from feeder end points and/or critical nodes as the control signal [3,[6][7][8]. However, in these works, the voltage measurements/estimates are only used to control tap position of substation OLTC and coordination between multiple OLTCs is not studied.…”

Section: Introductionmentioning

confidence: 99%

Optimal OLTC voltage control scheme to enable high solar penetrations

Disfani

Pecenak

et al. 2018

Electric Power Systems Research

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High solar Photovoltaic (PV) penetration on distribution systems can cause over-voltage problems. To this end, an Optimal Tap Control (OTC) method is proposed to regulate On-Load Tap Changers (OLTCs) by minimizing the maximum deviation of the voltage profile from 1 p.u. on the entire feeder. A secondary objective is to reduce the number of tap operations (TOs), which is implemented for the optimization horizon based on voltage forecasts derived from high resolution PV generation forecasts. A linearization technique is applied to make the optimization problem convex and able to be solved at operational timescales. Simulations on a PC show the solution time for one time step is only 1.1 s for a large feeder with 4 OLTCs and 1623 buses. OTC results are compared against existing methods through simulations on two feeders in the Californian network. OTC is firstly compared against an advanced rule-based Voltage Level Control (VLC) method. OTC and VLC achieve the same reduction of voltage violations, but unlike VLC, OTC is capable of coordinating multiple OLTCs. Scalability to multiple OLTCs is therefore demonstrated against a basic conventional rulebased control method called Autonomous Tap Control (ATC). Comparing to ATC, the test feeder under control of OTC can accommodate around 67% more PV without over-voltage issues. Though a side effect of OTC is an increase in tap operations, the secondary objective functionally balances operations between all OLTCs such that impacts on their lifetime and maintenance are minimized.

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Voltage Control in PV-Rich LV Networks Without Remote Monitoring

Cited by 69 publications

References 18 publications

A Review of Voltage Control Strategies for Low-Voltage Networks With High Penetration of Distributed Generation

A Review of Voltage Control Strategies for Low-Voltage Networks With High Penetration of Distributed Generation

Accurate Assessment of Decoupled OLTC Transformers to Optimize the Operation of Low-Voltage Networks

Optimal OLTC voltage control scheme to enable high solar penetrations

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