A Robust Suboptimal Current Control of an Interlink Converter for a Hybrid AC/DC Microgrid

Fitri, Ismi Rosyiana; Kim, Jung-Su; Song, Hwachang

doi:10.3390/en11061382

Cited by 13 publications

(14 citation statements)

References 18 publications

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“…To control the AC-DC back-to-back converter, the control strategy displayed in Figure 8 is programmed in the RTCP. The converter is regulated to operate as an interlinking AC-DC converter to achieve AC-DC power transference [24,25]. The controlled rectifier is regulated using a dq control strategy and a Proportional-Integral (PI) controllers as proposed in [26,27].…”

Section: Power Electronic Application To Test the Rtcpmentioning

confidence: 99%

Design and Implementation of a Low-Cost Real-Time Control Platform for Power Electronics Applications

et al. 2020

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In recent years, different off-the-shelf solutions for the rapid control prototyping of power electronics converters have been commercialised. The main benefits of those systems are based on a fast and easy-to-use environment due to high-level programming. However, most of those systems are very expensive and are closed software and hardware solutions. In this context, this paper presents the design and implementation of a control platform targeting at the segment in between expensive off-the-shelf control platforms and low-cost controllers. The control platform is based on the Launchpad TMS320F28379D from Texas Instruments, and it is equipped with an expansion board that provide analogue-to-digital measurements, switching signals and hardware protections. The performance of the control platform is experimentally tested on a 20 kVA power converter.

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Section: Power Electronic Application To Test the Rtcpmentioning

confidence: 99%

Design and Implementation of a Low-Cost Real-Time Control Platform for Power Electronics Applications

et al. 2020

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“…Also, as indicated by the aforementioned analysis, any positive gain value can be used for both the inner-loop and outer-loop controllers' gains, and this provides an excellent possibility of applying the best technique for the gain selection among many found in the literature [34]. The significance of suitably tuning the controllers' gains has been pointed out by many authors and other methods such as linear matrix inequalities (LMIs) or Fuzzy-based techniques [35,36] have been effectively proposed to synthesize the particular controllers. Specifically, since the damping terms of the inner-loop controllers are selected with small gain values, both the inner-and outer-loop controllers can be tuned as pure PI controllers.…”

Section: Lemma 1 [31]mentioning

confidence: 99%

Validation of Novel PLL-driven PI Control Schemes on Supporting VSIs in Weak AC-Connections

2020

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The integration of distributed energy resources (DERs) in modern power systems has substantially changed the local control capabilities of the grid since the majority of DERs are connected through a controlled dc/ac inverter interface. Such long-distance located DER installations, usually represented by current regulated dc sources, can inject large amounts of power into the main ac grid at points where the strength of the ac connection is low. The efficient and stable performance of such a power scheme is related to the capability of the control applied to retain the power extraction close to the maximum and simultaneously to regulate the dc-side voltage as well as the ac-side voltage magnitude at the weak ac connection point. This is implemented by designing the controllers of the voltage source inverters (VSIs) in a manner that reliably satisfies the above tasks. To this end, decentralized cascaded control schemes, driven by novel, locally implemented phase locked loops (PLLs), suitable to work in weak ac connections, are proposed for the VSI performance regulation by using new fast inner-loop proportional-integral (PI) current controllers. A decisive innovation is proposed by inserting an extra damping term in the inner-loop controllers to guarantee stability and convergence to the desired equilibrium. This is analytically proven by a rigorous analysis based on the entire nonlinear system model, where advanced Lyapunov-based methods are deployed in detail. As a good transient response of the VSI interface is indeed critical for the energy and grid system management, the conducted simulation and experimental results confirm that the proposed scheme efficiently supports the ac- and dc-side voltages of the VSI under different varying conditions in the power production or any voltage changes of the main grid.

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“…This is why the hybrid energy storage system (HESS) is becoming an interesting solution, able to extend batteries' useful life. By combining fast-dynamics high-power storage devices as supercapacitors and ultracapacitors with bulk-energy electrochemical units, the performance of classic grid forming ESSs has been improved [16][17][18][19]. The initial investment in supercapacitors can be paid off by extending the useful life of the batteries.…”

Section: Introductionmentioning

confidence: 99%

A Distributed Control Strategy for Islanded Single-Phase Microgrids with Hybrid Energy Storage Systems Based on Power Line Signaling

et al. 2018

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Energy management control is essential to microgrids (MGs), especially to single-phase ones. To handle the variety of distributed generators (DGs) that can be found in a MG, e.g., renewable energy sources (RESs) and energy storage systems (ESSs), a coordinated power regulation is required. The latter are generally battery-based systems whose lifetime is directly related to charge/discharge processes, whereas the most common RESs in a MG are photovoltaic (PV) units. Hybrid energy storage systems (HESS) extend batteries life expectancy, thanks to the effect of supercapacitors, but they also require more complex control strategies. Conventional droop methodologies are usually applied to provide autonomous and coordinated power control. This paper proposes a method for coordination of a single-phase MG composed by a number of sources (HESS, RES, etc.) using power line signaling (PLS). In this distributed control strategy, a signal whose frequency is higher than the grid is broadcasted to communicate with all DGs when the state of charge (SoC) of the batteries reaches a maximum value. This technique prevents batteries from overcharging and maximizes the power contribution of the RESs to the MG. Moreover, different commands apart from the SoC can be broadcasted, just by changing to other frequency bands. The HESS master unit operates as a grid-forming unit, whereas RESs act as grid followers. Supercapacitors in the HESS compensate for energy peaks, while batteries respond smoothly to changes in the load, also expanding its lifetime due to less aggressive power references. In this paper, a control structure that allows the implementation of this strategy in single-phase MGs is presented, with the analysis of the optimal range of PLS frequencies and the required self-adaptive proportional-resonant controllers.

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A Robust Suboptimal Current Control of an Interlink Converter for a Hybrid AC/DC Microgrid

Cited by 13 publications

References 18 publications

Design and Implementation of a Low-Cost Real-Time Control Platform for Power Electronics Applications

Design and Implementation of a Low-Cost Real-Time Control Platform for Power Electronics Applications

Validation of Novel PLL-driven PI Control Schemes on Supporting VSIs in Weak AC-Connections

A Distributed Control Strategy for Islanded Single-Phase Microgrids with Hybrid Energy Storage Systems Based on Power Line Signaling

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