A Review of Power Decoupling Techniques for Microinverters With Three Different Decoupling Capacitor Locations in PV Systems

Hu, Haibing; Harb, Souhib; Kutkut, N.H.; Batarseh, Issa; Shen, Z. John

doi:10.1109/tpel.2012.2221482

Cited by 444 publications

(167 citation statements)

References 38 publications

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“…The slopes mzero [nTs] and mact [nTs], which are represented in (8) and (9), are acquired by Equation (2).…”

Section: Proposed Predictive Control Methods For Single-phase Invertermentioning

confidence: 99%

“…With the increasing popularity of renewable energy systems, single-phase converters for grid-connected systems with distributed power generation sources, such as those for photovoltaic (PV) panels [1], electric vehicles [2], and railway systems [3], have been used more often for relatively low-power applications. One of the main objectives of single-phase converters and inverters is to synthesize a high-quality ac-side sinusoidal current tracking a reference current, to transfer the power required by a variety of systems.…”

Section: Introductionmentioning

confidence: 99%

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Model-Based Predictive Current Control Method with Constant Switching Frequency for Single-Phase Voltage Source Inverters

Roh

Kwak

2017

Energies

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Voltage source inverters operated by predictive control methods generally lead to a variable switching frequency, because predictive control methods generate switching operation based on an optimal voltage state selected at every sampling period. Varying switching frequencies make it difficult to design output filters of voltage source inverters. This paper proposes a predictive control algorithm with a constant switching frequency for the load current control of single-phase voltage source inverters. This method selects two future optimal voltage states used in the subsequent sampling period, which are a zero-voltage state and a future optimal voltage state, based on the slope of the reference current at each sampling period. After selecting the two future voltages, the proposed method distributes them to produce a constant switching frequency and symmetric switching pattern. The performance of the proposed method is validated with both simulation and experimental results for single-phase voltage source inverters.

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“…The slopes mzero [nTs] and mact [nTs], which are represented in (8) and (9), are acquired by Equation (2).…”

Section: Proposed Predictive Control Methods For Single-phase Invertermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Model-Based Predictive Current Control Method with Constant Switching Frequency for Single-Phase Voltage Source Inverters

Roh

Kwak

2017

Energies

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“…It can be seen that p o (t) consists of fluctuating power at twice the fundamental frequency, which has to be decoupled using the capacitor since the PV output power is normally controlled as constant (with high frequency pulsation) [3], [10], [15]. Hence, the electrical stresses of the inverter input capacitor (C dc1 or C dc2 ) can simply be calculated as,…”

Section: B Capacitor Sizingmentioning

confidence: 99%

“…These transient ripples will affect the capacitor lifetime and may make the capacitors fail to operate suddenly. In contrast to those capacitors placed at the PV-side, although the transient ripples of the capacitor C dc2 at the inverter-side in a doublestage system are also induced by mission profiles, the ripples could be alleviated by tuning the inverter control parameters or by adding auxiliary power decoupling circuits [10], [11], [24]. In summary, from a design point of view, the capacitors at the PV side (C dc1 and C pv2 ) should have the ability to handle a wide range of voltage variations due to mission profile effects, and the inverter control parameters should be tuned appropriately to reduce both voltage and current transient ripples of the capacitor at the inverter input (C dc2 ).…”

Section: Long-term Mission Profile Translation To Capacitor Strementioning

confidence: 99%

“…In [10], a benchmarking of various power decoupling techniques for PV micro-inverters with different DC-link capacitor locations has been provided in terms of cost, efficiency, and control complexity. However, all those solutions to reduce the size of the required capacitance of the DC-link capacitors, and thus improvement of capacitor reliability, are mostly discussed under normal operation modes with constant environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

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Mission profile translation to capacitor stresses in grid-connected photovoltaic systems

Yang

Wang

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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Single input qZ‐source cascaded multilevel inverters : Analysis , design, and implementation

Guisso

Vargas

Faistel

et al. 2021

Int Trans Electr Energ Syst

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The Single Input quasi-Z-Source Cascade Multilevel Inverter (SIqZS-CMI) has the ability to make use of a single DC input source and to share active power among all cascaded qZS modules. This unique feature, do not present in any other quasi-Z-Source (qZS) multilevel inverter in the literature, is accomplished by replacing one of its Z-impedance inductances by a coupled inductor. With this topology, it is possible to make use of a single low voltage PV string, favoring the use of small size residential rooftop systems. In addition, it simplifies the system grounding and the compliance with many Installation, Maintenance, and Safety Codes and Standards. The proposed control strategy enables high quality current injection into the grid, keeping the DC bus voltage regulation, ensuring precise power balancing with symmetric multilevel waveforms. Experimental results from a 5-level SIqZS-CMI prototype demonstrate the system's performance and its advantages.active power sharing, cascaded loop controller, cascaded multilevel inverter (CMI), DC-AC converter, grid-tied, photovoltaic (PV) power system, quasi-Z-source inverter (qZSI) | INTRODUCTIONRecently, Z-source and quasi-Z-source (qZS) multilevel inverters have been presented in literature. 1,2 These converters combine the advantages of cascaded multilevel inverters (CMIs) with the voltage gain provided by impedance-source List of Symbols and Abbreviations: C f , filter capacitor; C in(a,b) , input capacitor of module a and b; C 1(a,b) , capacitor 1 of module; C 2(a,b) , capacitor 2 of module; D 0(a,b) , duty-cycle of the ST; D 1(a,b) , module diode a and b; D 2(b) , module diode b; f grid , grid frequency; f s , switching frequency; i grid , grid current; i in , input current; i P , secondary winding current; I PN(a,b) , current drained from module a and a; L 1(a,b) , inductor 1 of module a and b; L 2(a,b) , inductor 2 of module a and b; L cf , converter-side inductor; L g , grid inductor; L gf , grid-side inductor; m (s), modulation index; N, turns-ratio; V a , module output voltage a; V b , module output voltage b; V grid , grid voltage; V PN(a,b) , module bus peak voltage a and b.;

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A Review of Power Decoupling Techniques for Microinverters With Three Different Decoupling Capacitor Locations in PV Systems

Cited by 444 publications

References 38 publications

Model-Based Predictive Current Control Method with Constant Switching Frequency for Single-Phase Voltage Source Inverters

Model-Based Predictive Current Control Method with Constant Switching Frequency for Single-Phase Voltage Source Inverters

Mission profile translation to capacitor stresses in grid-connected photovoltaic systems

Single input qZ‐source cascaded multilevel inverters : Analysis , design, and implementation

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