Decentralized Parallel Operation of Inverters Sharing Unbalanced and Nonlinear Loads

De, Dipankar; Ramanarayanan, V.

doi:10.1109/tpel.2010.2068313

Cited by 240 publications

(117 citation statements)

References 28 publications

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“…In literature several applications of the droop control, normally used for synchronous generators, are reported for the parallel operation multiple inverters without communication [16], [17]. In [18], the hierarchical control of a decentralized micro grid is analyzed.…”

Section: State Of Art Of Micro-grid Conceptsmentioning

confidence: 99%

Analysis of the frequency‐based control of a master/slave micro‐grid

Buticchi

Carne

Barater

et al. 2016

IET Renewable Power Generation

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Renewable energy penetration in the low-voltage grid faces several limitations due to the current grid topology. Master/slave micro-grids could help solving these issues, by offering additional services to the grid, such as the power management of the distributed power energy sources.In some cases, the power produced by the distributed energy sources exceeds the local consumption of the low-voltage grid. The consequent reverse power flow can be either dangerous (for the medium voltage) or impossible (for a micro-grid with limited storage). The droop characteristic of commercial inverter can be exploited to avoid this behavior. However stability problems can arise due to a low phase-locked-loop (PLL) bandwidth. This paper investigates the stability of this solution depending on the bandwidth of the PLL of the distributed power generation sources. I. INTRODUCTIONThe distributed power generation systems (DPGS) became more and more important over the last few years. Their increasing popularity has been driven by the use of renewable energy sources and the rising costs of the energy distribution, leading to modifications of the electric grid. Among the renewable energy sources employed in this framework, photovoltaic (PV) is receiving a great attention. PV systems can be divided into island-grid (or stand-alone), where the converters supply local loads, and grid-connected, where the power produced by the panels is transferred to the electrical grid.In general, grid-connected systems have been preferred to stand-alone ones, since the mains can compensate the energy production oscillations due to the variable nature of the PV source. As a consequence a great number of distributed low power sources have been connected to the LV grid in the last years, leading in some case to grid stability problem such as: transformer reverse power flow, voltage rise, unexpected islanding operations, sympathetic tripping, etc.[1], [2].To partially mitigate these problems, standards have recently imposed to grid-connected inverters to vary their output power in function of the instantaneous value of grid voltage and frequency (CEI-021 [3]). In fact, when in a LV grid the amount of energy from installed distributed sources is comparable to the loads' consumption, particular care must be taken to manage conditions of high imbalance between power generation and energy demand. Therefore, grid-connected systems have to limit their output power to face the cases of low local consumption. For PV systems an example is that of summer months in south European regions, when to an high PV energy production may not correspond an equivalent local demand [4]. This paper investigates the stability of a micro-grid where a frequency control is adopted to manage the power balance [5]- [7]. The basic assumption is that the frequency of the micro-grid can be changed (fully-decentralized micro-grid or smart-transformer micro-grid) to interact with the distributed sources. The novelty of the proposed approach is that standard current-controlled grid-connected ...

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Section: State Of Art Of Micro-grid Conceptsmentioning

confidence: 99%

Analysis of the frequency‐based control of a master/slave micro‐grid

Buticchi

Carne

Barater

et al. 2016

IET Renewable Power Generation

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“…The second group of methods is based on the virtual output impedance concept [81]- [84]. These alternatives adopt the multiple feedback loop control, where the virtual impedance is emulated by using a load current feedforward loop.…”

Section: B Instantaneous Power Balancing Strategiesmentioning

confidence: 99%

“…A droop relationship between the total harmonic VAR and harmonic conductance is developed to share nonlinear loads [84], as shown in Fig. 18.…”

Section: B Instantaneous Power Balancing Strategiesmentioning

confidence: 99%

A Review of Power Electronics Based Microgrids

Wang¹,

Guerrero²,

Blaabjerg³

et al. 2012

Journal of Power Electronics

152

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The increased penetration of Distributed Energy Resources (DER) is challenging the entire architecture of conventional electrical power system. Microgrid paradigm, featuring higher flexibility and reliability, becomes an attractive candidate for the future power grid. In this paper, an overview of microgrid configurations is given. Then, possible structure options and control methods of DER units are presented, which is followed by the descriptions of system controls and power management strategies for AC microgrids. Finally, future trends of microgrids are discussed pointing out how this concept can be a key to achieve a more intelligent and flexible power system.

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“…Many models have been established for DG systems [8], [10], [13]. However, the line impedance is viewed as either fully inductive or fully resistive.…”

Section: Modeling and Stability Analysismentioning

confidence: 99%

Wireless Paralleled Control Strategy of Three-phase Inverter Modules for Islanding Distributed Generation Systems

Guo¹,

Sha²,

Liao³

2013

Journal of Power Electronics

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This paper presents a control strategy for distributed systems, which can be used in islanded microgrids. The control strategy is based on the droop method, which uses locally measured feedback to achieve load current sharing. Instead of the traditional droop method, an improved one is implemented. A virtual inductor in the synchronous frame for three-phase inverters is proposed to deal with the coupling of the frequency and the amplitude related to the active and reactive power. Compared with the traditional virtual inductor, the proposed virtual inductor is not affected by high frequency noises because it avoids differential calculations. A model is given for the distributed generation system, which is beneficial for the design of the droop coefficients and the value of the virtual inductor. The effectiveness of the proposed control strategy is verified by simulation and experiment results.

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Decentralized Parallel Operation of Inverters Sharing Unbalanced and Nonlinear Loads

Cited by 240 publications

References 28 publications

Analysis of the frequency‐based control of a master/slave micro‐grid

Analysis of the frequency‐based control of a master/slave micro‐grid

A Review of Power Electronics Based Microgrids

Wireless Paralleled Control Strategy of Three-phase Inverter Modules for Islanding Distributed Generation Systems

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