Control Strategy for a Four-Wire T-Type qZSI based PV System to Support Grids with Unbalanced Non-Linear Loads

Pires, V. Fernão; Cordeiro, Armando; Roncero‐Clemente, Carlos; Martins, J. F.

doi:10.1109/cpe.2019.8862353

Cited by 5 publications

(5 citation statements)

References 23 publications

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“…The purpose of the simulation shown in Figs. 13 is to check the correct operation of the neutral-point imbalance compensation. The following conditions are considered for this test: U PV = 720 V; D 0 = 0.1; P * = 30 kW and Q * 1 = 10 kVAr.…”

Section: Figure 12mentioning

confidence: 99%

“…References [11], [12] treat the Z-source-T-type and quasi-Z-source-T-type topologies, respectively, including grid control, but do not perform compensating actions. Authors in [13] introduced a grid control strategy with compensating action; however, it has not been shown to work well under distorted grid voltages. Besides no experimental tests have been reported.…”

Section: Introductionmentioning

confidence: 99%

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Three-Level T-Type Quasi-Z Source PV Grid-Tied Inverter With Active Power Filter Functionality Under Distorted Grid Voltage

et al. 2022

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Distributed energy resources (DER) such as solar photovoltaic (PV) interfaces with the utility grid by high-efficiency power electronic converters. This equipment is sometimes underutilized in terms of its power capacity; thus, the remaining capacity can be used to provide support to the distribution system. In this sense, this work assesses the performance of the three-level T-type quasi-impedance source inverter (3L-T-type qZSI) injecting not only active power to the grid, but also providing support to it by injecting reactive power and acting as an active power filter (APF) simultaneously. The global control strategy of the grid-connected inverter is derived from the instantaneous i d -i q power theory. The combination of an improved deadbeat current controller and a level-shifted carrier-based pulse-width-modulation (PWM) technique, using both the upper shoot-through (UST) and the lower shoot-through (LST) alternating states, allows a successful tracking of the current references. Both the dc-link voltage control and the neutral-point balancing are properly achieved by taking the advantage of the shoot-through (ST) states and the redundant states simultaneously. These control actions are implemented by simple proportional-integral (PI) controllers. The simulation and experimental results demonstrate the above-mentioned functionalities and verify the stability and good dynamic response of the grid-connected 3L-T-type qZSI.

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Section: Figure 12mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three-Level T-Type Quasi-Z Source PV Grid-Tied Inverter With Active Power Filter Functionality Under Distorted Grid Voltage

et al. 2022

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“…Several studies have been made with the classical fourwire three-phase inverter [33]. Other topologies like the fourwire double-buck and quasi-Z have also been studied to provide unbalance compensation [34][35][36].…”

Section: Fig 2 Structure Of Renewable Generators and Storage Systemsmentioning

confidence: 99%

“…In Fig. 4 is presented a scheme of a possible controller for this system [36]. For the unbalance compensation it must be considered two possible conditions: power injected by the PV system lower than the load power and power injected by the PV system higher than the load power.…”

Section: Fig 2 Structure Of Renewable Generators and Storage Systemsmentioning

confidence: 99%

Balancing LV Distribution Networks in the Context of the Smart Grid

2019

ijSmartGrid

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One of the problems that Low Voltage (LV) distribution networks face is related to unbalance loads. These networks are characterized by the existence of single-phase loads that will unbalance the network. Due to this, there are higher losses, voltage unbalances and the possibility to emerge voltage levels that are not accepted by the legislation. However, the change in the actual paradigm regarding the integration of renewable energy sources (RES) in the LV distribution networks and the implementation of Smart-Grids (SG), will lead to the improvement of the quality of those networks. This work presents an overview of the technologies and strategies that have been introduced in the context of the Smart-Grids to attenuate the unbalance loads' related problems. To verify such impact, it will also be presented a study of a real network. This study will show the benefits resulting from the mitigation of this problem on the context of the SG.

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“…With the passage of time, new power connections are adding rapidly, having a huge diversity of loads and this makes traditional power systems highly vulnerable to frequent failures (Haes Alhelou et al, 2019;Abedi et al, 2019). The connections based on non-linear loads deteriorate the quality of the power supply due to the non-harmonic supply curve (Pires et al, 2019). High PAR of power consumption curve results in huge losses to utilities as well as discomfort to users due to intermittent supply (blackouts) (Afzalan and Jazizadeh, 2019).…”

Section: Introductionmentioning

confidence: 99%

Utilization of ICT and AI techniques in harnessing residential energy consumption for an energy-aware smart city: A review

al.¹

2021

Int. j. adv. appl. sci.

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Fusion of Information and Communication Technologies (ICT) in traditional grid infrastructure makes it possible to share certain messages and information within the system that leads to optimized use of energy. Furthermore, using Computational Intelligence (CI) in the said domain opens new horizons to preserve electricity as well as the price of consumed electricity effectively. Hence, Energy Management Systems (EMSs) play a vital role in energy economics, consumption efficiency, resourcefulness, grid stability, reliability, and scalability of power systems. The residential sector has its high impact on global energy consumption. Curtailing and shifting load of the residential sector can result in solving major global problems and challenges. Moreover, the residential sector is more flexible in reshaping power consumption patterns. Using Demand Side Management (DSM), end users can manipulate their power consumption patterns such that electricity bills, as well as Peak to Average Ratio (PAR), are reduced. Therefore, it can be stated that Home Energy Management Systems (HEMSs) is an important part of ground-breaking smart grid technology. This article gives an extensive review of DSM, HEMS methodologies, techniques, and formulation of optimization problems. Concluding the existing work in energy management solutions, challenges and issues, and future research directions are also presented.

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Control Strategy for a Four-Wire T-Type qZSI based PV System to Support Grids with Unbalanced Non-Linear Loads

Cited by 5 publications

References 23 publications

Three-Level T-Type Quasi-Z Source PV Grid-Tied Inverter With Active Power Filter Functionality Under Distorted Grid Voltage

Three-Level T-Type Quasi-Z Source PV Grid-Tied Inverter With Active Power Filter Functionality Under Distorted Grid Voltage

Balancing LV Distribution Networks in the Context of the Smart Grid

Utilization of ICT and AI techniques in harnessing residential energy consumption for an energy-aware smart city: A review

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