Reducing grid losses and voltage unbalance with PV inverters

Weckx, Sam; González, Carlos Larrinaga; Driesen, Johan

doi:10.1109/pesgm.2014.6939416

Cited by 27 publications

(16 citation statements)

References 15 publications

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“…However, most of the references examined consider only one type of control measures and ignore the coordination potential of various active measures available to the DSO. For example, [11], [12] use only active power control of balancing inverters, ignoring reactive power or On Load Tap Changing (OLTC) transformers, while reference [13], focusing on the design of Battery Energy Storage Systems (BESS), considers only active and reactive power exchange of the inverters. Furthermore, none of the examined papers considers the unbalance requirement within an OPF framework, but they evaluate the grid conditions using power flow calculations.…”

Section: Motivationmentioning

confidence: 99%

“…More specifically, the total load taken from [28] is split in 25%, 60%, and 15% among the three phases. The installed PV capacity, is set to S PV rated = 28% of the total maximum load of the entire feeder to the PV nodes = [12,16,17,18,19], and is shared on average by 15%, 15% and 70% among the three phases. Furthermore, we consider BESS at the PV nodes of capacity equal to 1 2 S PV rated kWh, where S PV rated is the rated power of the PV unit at that particular node, and a flexible load of 5 kW connected at phase C of Node 16, whose total daily energy consumption needs to be maintained constant.…”

Section: A Network Description -Case Study Setupmentioning

confidence: 99%

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A Centralised Control Method for Tackling Unbalances in Active Distribution Grids

Karagiannopoulos

Aristidou

Hug

2018

2018 Power Systems Computation Conference (PSCC)

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Section: Motivationmentioning

confidence: 99%

Section: A Network Description -Case Study Setupmentioning

confidence: 99%

A Centralised Control Method for Tackling Unbalances in Active Distribution Grids

Karagiannopoulos

Aristidou

Hug

2018

2018 Power Systems Computation Conference (PSCC)

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“…Initially, from t = 0 s to t = 0.5 s, the system is operated under a similar load profiles as in Case 1. The unbalance droop constant in [4,21] is chosen as 100 W/V. It is observed that due to lack in the coordination among all the PV + BESS sources connected in the system, the currents shared among these sources are different, which increases the burden on one individual inverter.…”

Section: (C) Case 3: Different Loading Conditionsmentioning

confidence: 99%

“…It is observed that due to lack in the coordination among all the PV + BESS sources connected in the system, the currents shared among these sources are different, which increases the burden on one individual inverter. Further, due to lack of a secondary controller, the voltage unbalance is not completely eliminated by the method proposed in [4,21]. In the proposed method, due to coordination the aforementioned objectives are achieved as shown in figure 8a,b.…”

Section: (C) Case 3: Different Loading Conditionsmentioning

confidence: 99%

Coordinated single-phase control scheme for voltage unbalance reduction in low voltage network

Pullaguram

Mishra

Senroy

2017

Phil. Trans. R. Soc. A.

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Low voltage (LV) distribution systems are typically unbalanced in nature due to unbalanced loading and unsymmetrical line configuration. This situation is further aggravated by single-phase power injections. A coordinated control scheme is proposed for single-phase sources, to reduce voltage unbalance. A consensus-based coordination is achieved using a multi-agent system, where each agent estimates the averaged global voltage and current magnitudes of individual phases in the LV network. These estimated values are used to modify the reference power of individual single-phase sources, to ensure system-wide balanced voltages and proper power sharing among sources connected to the same phase. Further, the high / ratio of the filter, used in the inverter of the single-phase source, enables control of reactive power, to minimize voltage unbalance locally. The proposed scheme is validated by simulating a LV distribution network with multiple single-phase sources subjected to various perturbations.This article is part of the themed issue 'Energy management: flexibility, risk and optimization'.

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“…Therefore primary feeders often have unbalanced systems wherein the greater the system imbalance, the poorer the power quality produced. For example, the voltage unbalance leads to zero-and negative-phase sequence voltages which, in turn, can reduce the torque output of three-phase induction motors and increase extra power loss [1][2][3]. The zero-sequence Figure 1 shows the systematical procedure of the proposed approach for reducing the neutral current by optimal rephasing in order to improve the current inefficient phase adjustment manual via report review from a record log of the DDCC.…”

Section: Introductionmentioning

confidence: 99%

Neutral Current Reduction in Three-Phase Four-Wire Distribution Feeders by Optimal Phase Arrangement Based on a Full-Scale Net Load Model Derived from the FTU Data

Lee

Jiang

et al. 2020

Energies

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An increase in the neutral current results in a malfunction of the low energy over current (LCO) protective relay and raises the neutral-to-ground voltage in three-phase, four-wire radial distribution feeders. Thus, the key point for mitigating its effect is to keep the current under a specific level. The most common approach for reducing the neutral current caused by the inherent imbalance of distribution feeders is to rearrange the phase connection between the distribution transformers and the load tapped-off points by using the metaheuristics algorithms. However, the primary task is to obtain the effective load data for phase rearrangement; otherwise, the outcomes would not be worthy of practical application. In this paper, the effective load data can be received from the feeder terminal unit (FTU) installed along the feeder of Taipower. The net load data consisting of customers’ power consumption and the power generation of distributed energy resources (DERs) were measured and transmitted to the feeder dispatch control center (FDCC). This paper proposes a method of establishing the equivalent full-scale net load model based on FTU data format, and the long short-term memory (LSTM) was adopted for monthly load forecasting. Furthermore, the full-scale net load model was built by the monthly per hour load data. Next, the particle swarm optimization (PSO) algorithm was applied to rearrange the phase connection of the distribution transformers with the aim of minimizing the neutral current. The outcomes of this paper are helpful for the optimal setting of the limit current of the LCO relay and to avoid its malfunction. Furthermore, the proposed method can also improve the three-phase imbalance of distribution feeders, thus reducing extra power loss and increasing the operating efficiency of three-phase induction motors.

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Reducing grid losses and voltage unbalance with PV inverters

Cited by 27 publications

References 15 publications

A Centralised Control Method for Tackling Unbalances in Active Distribution Grids

A Centralised Control Method for Tackling Unbalances in Active Distribution Grids

Coordinated single-phase control scheme for voltage unbalance reduction in low voltage network

Neutral Current Reduction in Three-Phase Four-Wire Distribution Feeders by Optimal Phase Arrangement Based on a Full-Scale Net Load Model Derived from the FTU Data

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