Improved Neutral Current Compensation With a Four-Leg PV Smart VSI in a LV Residential Network

Rafi, Fida Hasan Md; Hossain, M. J.; Lu, Junwei

doi:10.1109/tpwrd.2016.2602220

Cited by 38 publications

(29 citation statements)

References 23 publications

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“…These mismatches may result from the losses in the array due to different specifications of PV modules and/or possessing different levels of irradiance by series-connected modules. The developed methods in [26] have not covered the partial shading problems of the PV generation systems at low voltage distribution network with the unbalanced loads.…”

Section: Issues Of Pv Generation Sidementioning

confidence: 99%

“…From the distribution transformer's side, neutral currents cause their windings to overheat, energy losses to increase, and capacity, efficiency and lifetime to reduce [38]. In the 3P4L inverter system, the additional fourth leg is employed to achieve neutral current compensation and their corresponding zero sequence currents at the point of common coupling (PCC) [26]. The neutral current I LN , and zero sequence current I L0 in a 3P4W system are expressed as follows [39]:…”

Section: Issues Of Distribution Utility Sidementioning

confidence: 99%

“…The generated power and current of the PV system are transferred into AC power using the inverter system according to the modulation command dx of the inverter. The L filter and the transmission line are modeled using inductances (L f , L g ) and series resistances (R f , R g ), respectively, whereas the neutral filter and the neutral conductor are modeled using (L fn , L gn ) for inductances and (R fn , R gn ) for resistances, respectively [26].…”

Section: Modeling Of Distribution Network Sidementioning

confidence: 99%

“…Nevertheless, it did not ensure the compensation with different scenarios of the network interaction with various loads. Another method was presented in [26]. It used 3P4L-VSI with fixed neutral-current compensation capacity by considering various possible load scenarios in distribution networks.…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional Distributed MPPT Controller for 3P4W Grid-Connected PV Systems in Distribution Network with Unbalanced Loads

et al. 2019

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The integration of photovoltaic (PV) systems with three-phase four-wire (3P4W) distribution networks has imposed several challenges related to existing unbalanced loads, reactive power generation and harmonics content. In this paper, a multifunctional distributed maximum power point (MPPT) controller for grid integration of PV systems is proposed. The proposed distributed MPPT controller is developed based on employing a four-leg three-level T-type multilevel inverter. The proposed inverter performs multifunctionalities, including distributed MPPT, neutral current compensation for the unbalanced loads, supplying reactive power into the grid and the grid integration. Moreover, the proposed inverter overcomes the stochastic behavior of both the PV generation with partial shading problems and its operation with unbalanced loads as well. Furthermore, the new proposed controller injects sinusoidal output currents with decreased levels of total harmonic distortion (THD) into the grid. The tested case study is investigated for the various operating scenarios of PV generation and load demands. The results and tabulated performance comparisons have proven the superior performance of the proposed multifunctional PV generation system. The results show the ability of the proposed controller to efficiently extract distributed MPPT for all PV modules at all the tested scenarios. Additional improvement of the energy efficiency is achieved through the elimination of the neutral current due to existing unbalanced loads.

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Section: Issues Of Pv Generation Sidementioning

confidence: 99%

Section: Issues Of Distribution Utility Sidementioning

confidence: 99%

Section: Modeling Of Distribution Network Sidementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multifunctional Distributed MPPT Controller for 3P4W Grid-Connected PV Systems in Distribution Network with Unbalanced Loads

et al. 2019

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“…Authors in Reference [6] employed the 3P-4L VSI with PV installation to compensate for the neutral current but case scenarios for network interaction with different loads are not presented. A fixed capacity neutral current compensation method employing 3P-4L VSI under various load scenarios for network contingencies cases is proposed in Reference [7]. Furthermore, the 3P-4L VSI is used to eliminate the leakage current from PV installations [8].…”

mentioning

confidence: 99%

Internet of Things Platform for Energy Management in Multi-Microgrid System to Improve Neutral Current Compensation

et al. 2018

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In this paper, an Internet of Things (IoT) platform is proposed for Multi-Microgrid (MMG) system to improve unbalance compensation functionality employing three-phase four-leg (3P-4L) voltage source inverters (VSIs). The two level communication system connects the MMG system, implemented in Power System Computer Aided Design (PSCAD), to the cloud server. The local communication level utilizes Modbus Transmission Control Protocol/Internet Protocol (TCP/IP) and Message Queuing Telemetry Transport (MQTT) is used as the protocol for global communication level. A communication operation algorithm is developed to manage the communication operation under various communication failure scenarios. To test the communication system, it is implemented on an experimental testbed to investigate its functionality for MMG neutral current compensation (NCC).To compensate the neutral current in MMG, a dynamic NCC algorithm is proposed, which enables the MGs to further improve the NCC by sharing their data using the IoT platform. The performance of the control and communication system using dynamic NCC is compared with the fixed capacity NCC for unbalance compensation under different communication failure conditions. The impact of the communication system performance on the NCC sharing is the focus of this research. The results show that the proposed system provides better neutral current compensation and phase balancing in case of MMG operation by sharing the data effectively even if the communication system is failing partially.Energies 2018, 11, 3102 2 of 22 control the neutral current directly [3], where the 3P-4L voltage source inverter (VSI) provides better unbalance compensation than other active and passive methods [4]. Traditionally, a fixed portion of the 3P-4L converter capacity is specified to compensate the neutral current. However, the drawback of this method is in case of higher neutral current compensation (NCC) necessity, where it can lead to increased capacity of the 3P-4L compensator [5]. Authors in Reference [6] employed the 3P-4L VSI with PV installation to compensate for the neutral current but case scenarios for network interaction with different loads are not presented. A fixed capacity neutral current compensation method employing 3P-4L VSI under various load scenarios for network contingencies cases is proposed in Reference [7]. Furthermore, the 3P-4L VSI is used to eliminate the leakage current from PV installations [8]. However, none of these researches have considered higher capacity requirement. Authors in Reference [9] propose a dynamic capacity distribution method to compensate for the neutral current utilizing the maximum capacity of the VSI in a Microgrid (MG) but no communication system in presented. Authors in References [10,11] have employed conservative power theory to share the residual neutral current among the VSIs in an MG. Although a communication system have been employed, its operational details are not presented. Cloud-based Internet of Things (IoT) platforms to manage energy of building...

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Internet of things platform for energy management in multi‐microgrid system to enhance power quality: ARBFNOCS technique

Vinjamuri

Burthi

2021

Int J Numerical Modelling

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This manuscript proposes an Internet of Things (IoT) platform for energy management (EM) in multi‐microgrid (MMG) system to enhance the power quality with hybrid method. The proposed method is the consolidation of opposition based crow search optimizer (OCSO) and radial basis functional neural network (RBFNN), hence it called RBFNOCS technique. The main aim of this manuscript is to optimally managing the power and resources of distribution system (DS) by constantly track the data from IoT‐based communication framework. In the proposed work, every devices of home is interfaced with data acquisition module (DAM) that is IoT object along unique IP address resultant in large mesh wireless network. Here, the IoT‐based communication framework is used for facilitating the development of a demand response (DR) energy management system (EMS) for distribution system. The transmitted data is processed by RBFNOCS technique. By utilizing the RBFNOCS method, the active with reactive power processing for optimal capacity unbalance compensation smart VSIs share the obtainable neutral current (NC). Likewise, the DS IoT framework enhances these networks flexibility and gives feasible use of obtainable resources. Moreover, the RBFNOCS method is responsible for satisfying the total supply with energy demand. The proposed model is activated in MATLAB/Simulink site and the performance is compared with existing models, namely improved artificial bee colony, squirrel search algorithm and gravitational search algorithm based artificial neural network (SOGSNN), GOAPSNN, fruit fly optimization, and FORDF technique. When compared with the existing methods, the efficiency of the RBFNOCS method is 93.4501%.

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Improved Neutral Current Compensation With a Four-Leg PV Smart VSI in a LV Residential Network

Cited by 38 publications

References 23 publications

Multifunctional Distributed MPPT Controller for 3P4W Grid-Connected PV Systems in Distribution Network with Unbalanced Loads

Multifunctional Distributed MPPT Controller for 3P4W Grid-Connected PV Systems in Distribution Network with Unbalanced Loads

Internet of Things Platform for Energy Management in Multi-Microgrid System to Improve Neutral Current Compensation

Internet of things platform for energy management in multi‐microgrid system to enhance power quality: ARBFNOCS technique

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