Optimal Modulation Method for DC-Link Control in Cascaded H-Bridge Multilevel Converters

Galván, Luis; Galván, E.; Carrasco, J.M.

doi:10.1109/iecon.2019.8926774

Cited by 3 publications

(15 citation statements)

References 18 publications

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“…In this paper, a strategy proposed in [11] is adapted to manage a 3-phase Y-connected HCHB, as represented in Fig. 2.…”

Section: A Hybrid Topologymentioning

confidence: 99%

“…The proposed control strategy is a variant from a previously presented method [11]. As in that method, a current control is assumed to provide some references 1 * , 2 * and 3 * for the voltages which must be modulated on each phase.…”

Section: Approach To the Proposed Solutionmentioning

confidence: 99%

“…Since only line voltage references need to be achieved, the final linear optimization problem (LOP) has the same structure as in [11].…”

Section:  mentioning

confidence: 99%

“…This LOP can be solved with the same method presented in [11]. The number of variables is greater and the formulas for the benefits are different, but the algorithm to solve the LOP remains the same.…”

Section:  mentioning

confidence: 99%

“…Within Multilevel Converter topologies, Cascaded H-Bridge (CHB) is considered a great deal to provide high voltage levels and modularity. This topology is principally used in power distribution applications [2]- [7] and photovoltaic applications [8]- [11], among others [12]. In this converter, energy storage systems would also be applied as DC power supply of the modules [13]- [15], adding capability of energy management to the converter.…”

Section: Introductionmentioning

confidence: 99%

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Energy Storage Systems Current Ripple Reduction for DC-Link Balancing Method in Hybrid CHB Topology

Gómez

Galván

et al. 2020

IECON 2020 the 46th Annual Conference of the IEEE Industrial Electronics Society

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This paper focusses on a hybrid topology for a CHB, where some or the modules are equipped with energy storage systems. In addition to the well-known capabilities of the CHB as a STATCOM, the hybrid topology has new advantages as a grid stabilizer. However, the current ripple on the energy storage systems has negative effects which tends to result in expensive solutions. To overcome this inconvenient, a previously known balance strategy is modified to prevent the ripple without compromising the DC-Link balance. This new control method is demonstrated through simulations.

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“…In this paper, a strategy proposed in [11] is adapted to manage a 3-phase Y-connected HCHB, as represented in Fig. 2.…”

Section: A Hybrid Topologymentioning

confidence: 99%

Section: Approach To the Proposed Solutionmentioning

confidence: 99%

“…Since only line voltage references need to be achieved, the final linear optimization problem (LOP) has the same structure as in [11].…”

Section:  mentioning

confidence: 99%

Section:  mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Energy Storage Systems Current Ripple Reduction for DC-Link Balancing Method in Hybrid CHB Topology

Gómez

Galván

et al. 2020

IECON 2020 the 46th Annual Conference of the IEEE Industrial Electronics Society

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Optimization-Based Capacitor Balancing Method with Selective DC Current Ripple Reduction for CHB Converters

et al. 2021

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From its introduction to the present day, Cascaded H-Bridge multilevel converters were employed on numerous applications. However, their floating capacitor, while advantageous for some applications (such as photovoltaic) requires the usage of balancing methods by design. Over the years, several such methods were proposed and polished. Some of these methods use optimization techniques or inject a zero-sequence voltage to take advantage of the converter redundancies. This paper describes an optimization-based capacitor balancing method with additional features. It can drive each module DC-Link to a different voltage for independent maximum power point tracking in photovoltaic applications. Moreover, the user can specify the independent active power set points to modules connected to batteries or any other energy storage systems. Finally, DC current ripple can be reduced on some modules, which can extend the lifespan of any connected ultra-capacitors. The method as a whole is tested on real hardware and compared with the state-of-the-art. In its simplest configuration, the presented method shows greater speed, robustness, and current wave quality than the state-of-the-art alternative in spite of producing about 1/3 fewer commutations. Its other characteristics provide additional functionalities and improve the adaptability of the converter to other applications.

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Optimization-Based Capacitor Balancing Method with Customizable Switching Reduction for CHB Converters

et al. 2022

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This paper presents a method for switching reduction in cascaded H-bridge converters. Given the wide applicability of this topology, it would be especially desirable to increase its efficiency with switching losses reduction techniques. Since this type of converter requires voltage balancing methods, several modulation methods consider the possibility of combining the balancing and switching reduction goals together. In this paper, a previously disclosed optimization-based balance method was modified further to consider the switching losses in its objective function. Each commutation was penalized in proportion to the phase current and the module voltage, thus avoiding commutations that would produce the most losses but tolerating low-losses commutations. The structure of the original method was maintained so that the algorithm could be applied with minimal change. The results show that it is possible to reduce the switching up to 14% without any noticeable drawback and up to 22% at the cost of a greater DC-link ripple. It is also possible to selectively reduce the effective switching frequency of only some modules, making it significantly low. This extends the adaptability of the converter, possibly allowing hybrid converters with modules of different transistor technologies.

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Optimal Modulation Method for DC-Link Control in Cascaded H-Bridge Multilevel Converters

Cited by 3 publications

References 18 publications

Energy Storage Systems Current Ripple Reduction for DC-Link Balancing Method in Hybrid CHB Topology

Energy Storage Systems Current Ripple Reduction for DC-Link Balancing Method in Hybrid CHB Topology

Optimization-Based Capacitor Balancing Method with Selective DC Current Ripple Reduction for CHB Converters

Optimization-Based Capacitor Balancing Method with Customizable Switching Reduction for CHB Converters

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