Nonlinear load sharing in low voltage microgrid using negative virtual harmonic impedance

Sreekumar, Preetha; Khadkikar, Vinod

doi:10.1109/iecon.2015.7392617

Cited by 10 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sharing of harmonic currents generated because of the presence of non-linear loads, such as rectifiers, have not been addressed by conventional droop methods [107,[113][114][115]. This presence of harmonics can affect the voltage and current wave-forms, cause overheating problems and add to losses, and lead to stability problems, therefore needed to be shared accurately [116,117].…”

Section: Reactive Power and Harmonic Current Sharingmentioning

confidence: 99%

Smart Inverters for Microgrid Applications: A Review

et al. 2019

View full text Add to dashboard Cite

In a microgrid, with several distributed generators (DGs), energy storage units and loads, one of the most important considerations is the control of power converters. These converters implement interfaces between the DGs and the microgrid bus. In order to achieve higher functionality, efficiency and reliability, in addition to improving the control algorithms it is beneficial to equip the inverters with “smart” features. One interpretation of “smartness” refers to minimizing the requirement of communication and therefore switching from centralized to decentralized control. At the same time, being equipped with efficient and state of the art communication protocols also indicates “smartness” since the requirement of communication cannot be completely omitted. A “smart inverter” should offer some features such as plug and play, self-awareness, adaptability, autonomy and cooperativeness. These features are introduced and comprehensively explained in this article. One contribution discussed here is the possibility of achieving long-range wireless communication between inverters to empower various control schemes. Although current efforts aim to modify and improve power converters in a way that they can operate communication free, if a suitable and functional communication protocol is available, it will improve the accuracy, speed and robustness of them.

show abstract

Section: Reactive Power and Harmonic Current Sharingmentioning

confidence: 99%

Smart Inverters for Microgrid Applications: A Review

et al. 2019

View full text Add to dashboard Cite

show abstract

“…For better clarification for the roll of virtual impedance in the improvement of non-linear load sharing, an equivalent circuit is illustrated in Fig. 1b [12,25,26]. It should be mentioned that the THD of the output voltage of DER unit, and therefore the voltage of PCC may be increased on account of the voltage drop across the R v,harm .…”

Section: Proposed Virtual Impedancementioning

confidence: 99%

“…Then, proposed fundamental and harmonic virtual impedances (HVIs) for local controllers (LCs) of DER units have been proposed based on communication-dependent centralised controller [23], and improved in [24] as an adjustable virtual impedance. On the basis of negative HVI and fast Fourier transform (FFT), a HP-sharing method has been discussed in [25,26], and later followed to control inverter impedance at harmonic frequencies in islanded microgrid [27]. In [28], P-integral (PI) and repetitive controllers have been proposed for power sharing and local harmonic compensation control in islanded microgrid [28].…”

Section: Introductionmentioning

confidence: 99%

Unbalanced harmonic power sharing and voltage compensation of microgrids using radial basis function neural network‐based harmonic power‐flow calculations for distributed and decentralised control structures

Baghaee

Mirsalim

Gharehpetian

et al. 2018

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

“…In an islanded microgrid, loads must be properly shared by multiple DG units. Generally, the control techniques for parallel operation of inverters in islanded microgrid operation can be split into two categories; droop control techniques [11], [12] and active load sharing techniques [13], [14]. Droop control is the common control that widely used in microgrid due to no dependenment on communication among parallel-connected inverters thus making it highly modular and reliable [15]- [17].…”

mentioning

confidence: 99%

Droop control technique for equal power sharing in islanded microgrid

Husna¹,

Roslan²,

Mat³

2019

IJPEDS

View full text Add to dashboard Cite

This paper presents a droop control technique for equal power sharing in islanded microgrid. In this study, the proposed controller is based on the frequency droop method, is applied to a robust droop controller in parallel connected inverters. The previous robust droop controller deals with voltage droop method. A modification has been formed against this controller by adding a fuzzy logic controller with the frequency droop method. The only sharing error which is concentrated in this paper is the error in sharing the rated frequency among the inverters. By adapting fuzzy in the robust droop, it tries to eliminate the frequency error, hence that the frequency reference of the inverters keeps maintain at 50Hz. A derivation of generalized models of a single-phase parallel-connected inverter system is shown. The simulation results show that the proposed controller with FLC is able to improve the stability of frequency reference and the performance of power sharing between the inverters under the inductive line impedance.

show abstract

Nonlinear load sharing in low voltage microgrid using negative virtual harmonic impedance

Cited by 10 publications

References 14 publications

Smart Inverters for Microgrid Applications: A Review

Smart Inverters for Microgrid Applications: A Review

Unbalanced harmonic power sharing and voltage compensation of microgrids using radial basis function neural network‐based harmonic power‐flow calculations for distributed and decentralised control structures

Droop control technique for equal power sharing in islanded microgrid

Contact Info

Product

Resources

About