Adaptive dc-link voltage control strategy to increase PV inverter lifetime

Callegari, Joao Marcus Soares; Cupertino, Allan Fagner; Ferreira, Victor; Brito, E.M.S.; Mendes, Victor F.; Pereira, Heverton Augusto

doi:10.1016/j.microrel.2019.113439

Cited by 9 publications

(7 citation statements)

References 15 publications

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“…It is well-known that if a fixed reference value of the dc-link voltage is chosen for the worst condition, it results in high switching and inductor losses in two-stage PV systems [134]. In [135], an adaptive dc-link voltage technique is suggested that shows that the PV system may have an increase in the lifetime of 75.76% as compared to the fixed dc-link control strategy. Hence, there exists a trade-off when operating the dc-link capacitor at a fixed or variable voltage.…”

Section: Dc-link Voltage Controlmentioning

confidence: 99%

“…(134) The advantage of variable dc-link voltage is the minimization of high frequency ripple current in the inductor. The ripple current is expressed as in (135).…”

Section: ) Voltage Drop Ratio Based Control (Vdrbc) [145]mentioning

confidence: 99%

“…∆ ∝ ( − ) (135) It can be seen in (135), that the ripple current is dependent on the difference of instantaneous PCC line voltage ( ) and dc-link voltage (…”

Section: ) Voltage Drop Ratio Based Control (Vdrbc) [145]mentioning

confidence: 99%

“…Another strategy is proposed in [135] which reduces the dc-link voltage to its minimum possible value to inject more power into the grid. To avoid the operation of the inverter in over modulation region, a linearization strategy is employed which helps in improving the transient and dynamic performance of the system.…”

Section: ) Cpi Based Dc-link Voltage Control (Cpidcvc) [147]mentioning

confidence: 99%

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A Comprehensive Review of Control Strategies to Overcome Challenges During LVRT in PV Systems

Joshi¹,

Swami

Jately

et al. 2021

IEEE Access

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Due to the high penetration of grid-connected photovoltaic (GCPV) systems, the network operators are regularly updating the grid codes to ensure that the operation of GCPV systems will assist in maintaining grid stability. Among these, low-voltage-ride-through (LVRT) is an important attribute of PV inverters that allows them to remain connected with the grid during short-term disturbances in the grid voltage. Hence, PV inverters are equipped with control strategies that secure their smooth operation through this ride-through period as per the specified grid code. During the injection of reactive power under LVRT condition, various challenges have been observed, such as inverter overcurrent, unbalance phase voltages at the point of common coupling (PCC), overvoltage in healthy phases, oscillations in active, reactive power and dc-link voltage, distortion in injected currents and poor dynamic response of the system. Several strategies are found in the literature to overcome these challenges associated with LVRT. This paper provides a critical review on the recent challenges and the associated strategies under LVRT conditions in GCPV inverters. The drawbacks associated with the conventional current control strategies are investigated in MATLAB/Simulink environment and each category of the advanced LVRT control strategy is analyzed under different types of grid faults. Moreover, this work categorizes different state-of-the-art LVRT techniques on the basis of synchronization methods, current injection techniques and dc-link voltage control strategies. It is found that the state-of-the-art control strategies like OVSS/OCCIDGS provides improved voltage support and current limitation which results in smooth LVRT operation by injecting currents of enhanced power quality.

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Section: Dc-link Voltage Controlmentioning

confidence: 99%

“…(134) The advantage of variable dc-link voltage is the minimization of high frequency ripple current in the inductor. The ripple current is expressed as in (135).…”

Section: ) Voltage Drop Ratio Based Control (Vdrbc) [145]mentioning

confidence: 99%

“…∆ ∝ ( − ) (135) It can be seen in (135), that the ripple current is dependent on the difference of instantaneous PCC line voltage ( ) and dc-link voltage (…”

Section: ) Voltage Drop Ratio Based Control (Vdrbc) [145]mentioning

confidence: 99%

Section: ) Cpi Based Dc-link Voltage Control (Cpidcvc) [147]mentioning

confidence: 99%

See 2 more Smart Citations

A Comprehensive Review of Control Strategies to Overcome Challenges During LVRT in PV Systems

Joshi¹,

Swami

Jately

et al. 2021

IEEE Access

View full text Add to dashboard Cite

show abstract

“…Operating in power limiting mode causes energy losses compared to operation at the GMPP. Moreover, high operating voltages affect the operation and efficiency of the inverter: the inverter capacitor lifetime shortens [11] and the efficiency of some inverters decreases [12] with increasing DC side voltage. The optimal sizing of the inverter depends on many factors such as inverter characteristics and irradiance conditions [13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the operation of PV strings at the MPP closest to the nominal MPP voltage instead of the global MPP based on measured current–voltage curves

Lappalainen

Valkealahti

2022

EPJ Photovolt.

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Under non-uniform operating conditions, photovoltaic (PV) generators may have several maximum power points (MPP) and voltage of the global MPP (GMPP) may vary quickly over a wide voltage range which may cause problems for tracking of the GMPP. Since highly varying GMPP voltage causes fluctuation of the inverter reference voltage, it would be beneficial to operate the PV system in a more predictable and straightforward manner by keeping the operating point of the inverter all the time close to the nominal MPP voltage. This article presents an experimental study of a scenario in which the MPP closest to the nominal MPP voltage (CMPP) is always the operating point instead of the GMPP. The analysis was based on 1,296,000 measured current–voltage curves of three different PV strings located at Tampere, Finland. 12 days of full-time measurements were analysed for each of the studied strings consisting of 6, 17 and 23 series-connected NAPS NP190GK PV modules. Furthermore, the effects of inverter sizing on the operating point behaviour of the strings were studied. The results show that the wide operating voltage range of the GMPP can be significantly reduced by operating at the CMPP at a cost of negligible energy losses. Energy losses due to power curtailment were much larger than energy losses due to operation at the CMPP instead of the GMPP.

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An improved DC link voltage control with double frequency second‐order generalized integrator for enhanced power quality of grid‐interfaced DFIG system

Hamid

Hussain

Iqbal

et al. 2023

Circuit Theory & Apps

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SummaryIn this study, an optimal double frequency second order generalized integrator (DFSOGI) based grid side converter control (GSC) is used for monitoring active power injection from the DFIG wind energy system as well as improving power quality at utility grid terminals. The reference DC voltage is adapted to variations in voltage at the point of common coupling (PCC) that reduces the burden on the converter switches and switching losses. In addition, an intelligent control technique based on white shark optimization algorithm (WSO) is endorsed, where an objective problem is formulated to obtain the desired parameters of the controller. Finally, time‐domain simulations are conducted in MATLAB environment that demonstrate the validity of the implemented control over various operating conditions. To affirm the adequacy of the proposed control strategy, the response of DC link voltage obtained through optimal tuning is compared to the conventional one. The proposed WSO tuning outperforms traditional manual tuning pertaining to enhancing the overall performance of the DFIG system. The designed WSO gains exhibit better steady‐state and transient performance including settling time, steady‐state error, and peak of over amplitude and harmonic distortion. The grid currents' total harmonic distortion (THD) is within 5% that meets specified IEEE‐519 standard.

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Adaptive dc-link voltage control strategy to increase PV inverter lifetime

Cited by 9 publications

References 15 publications

A Comprehensive Review of Control Strategies to Overcome Challenges During LVRT in PV Systems

A Comprehensive Review of Control Strategies to Overcome Challenges During LVRT in PV Systems

Analysis of the operation of PV strings at the MPP closest to the nominal MPP voltage instead of the global MPP based on measured current–voltage curves

An improved DC link voltage control with double frequency second‐order generalized integrator for enhanced power quality of grid‐interfaced DFIG system

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