Enhancing PV Penetration in LV Networks Using Reactive Power Control and On Load Tap Changer With Existing Transformers

Aziz, T.; Ketjoy, Nipon

doi:10.1109/access.2017.2784840

Cited by 75 publications

(39 citation statements)

References 19 publications

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“…A similar result was also obtained for the distribution of sources determined from the particle swarm optimization (PSO) algorithm. These conclusions were confirmed in [5], in which various scenarios of source distribution in the network, different load and generation levels were considered. The reaction of the network was investigated when controlling the reactive power of the inverter, controlling the voltage in the MV/LV transformer with an on-load tap-changer and using both of these measures simultaneously.…”

Section: Voltage Control In the Transformer Oltcmentioning

confidence: 55%

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: 55%

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

Janiga

2020

IAPGOS

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“…No-load tap-changing (NLTC) transformers comprise the vast majority of transformers in distribution networks with adjustable taps due to their low cost and large number [1,2]. Prior to the widespread increase in distributed energy resources (DERs), NLTC transformer taps have been set to boost the secondary voltage as the unadjusted voltage magnitude decreases with electrical distance from the substation.…”

Section: Introductionmentioning

confidence: 99%

A Practical Approach to Optimising Distribution Transformer Tap Settings

Paoli

Brinkmann²,

Negnevitsky

2020

Energies

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This paper proposes a method of determining the optimal tap settings for no-load distribution transformers with tap-changing capabilities that is practical to apply in real distribution networks. The risk of low voltage distribution networks violating voltage constraints is impacted by the increasing uptake of distributed energy resources and embedded generation. Some of this risk can be alleviated by suitably setting no-load transformer tap settings, however, modifying these taps requires customer outages and must be infrequent. Hence, loading over the entire year must be considered to account for seasonal variations when setting these taps optimally. These settings are determined using evolution strategy optimisation based on an average loading case. Monte Carlo simulations are used to calculate the probability that the terminal voltages on the distribution transformer secondary terminals violate the network voltage limits when the optimal set of taps for the average case is applied over a whole year. This algorithm was tested on several cases of a real distribution feeder of varying complexity, and produces a sufficiently-optimal set of taps without significant computation time.

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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%

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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Enhancing PV Penetration in LV Networks Using Reactive Power Control and On Load Tap Changer With Existing Transformers

Cited by 75 publications

References 19 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

A Practical Approach to Optimising Distribution Transformer Tap Settings

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

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