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

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

doi:10.1109/iecon43393.2020.9254892

Cited by 6 publications

(9 citation statements)

References 21 publications

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“…Solve the LOP given by (24). The simplex method is appropriate to solve the LOP, but during the tests, a faster algorithm from [29] and [35] was used; 3.…”

Section: Methodsmentioning

confidence: 99%

“…This research considers the thermal conditions and attempts to reduce the degradation caused by over-switching without interfering with the performance. This problem takes special relevance in hybrid applications such as [29]. In these situations, a lower number of commutations can improve the lifetime of the ESS and reduce the switching losses of the modules, resulting in great economic savings.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Solve the LOP given by (24). The simplex method is appropriate to solve the LOP, but during the tests, a faster algorithm from [29] and [35] was used; 3.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…As this configurational concept proceeds, the inverter output voltage waveform nears a sinusoid; with less harmonics content. CHB inverters are popularly deployed in power electronic transformer applications, [1], [2], [3], static synchronous compensator (STATCOM) [4], [5] energy storage system, [6], [7], [8]. They also have wide application in renewable generation systems, [9], [10], [11]; as well as in electric drive applications, [12], [13] and charging stations [14].…”

Section: Introductionmentioning

confidence: 99%

Space Vector Pulsewidth Modulation Strategy for Multilevel Cascaded H-Bridge Inverter With DC-Link Voltage Balancing Ability

Lewicki

Odeh

Morawiec

2023

IEEE Trans. Ind. Electron.

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Space vector pulse-width modulation, SVPWM, algorithms for cascaded H-bridge multilevel, CHB ML, inverter usually provide the possibility of using several combinations of active voltage vectors to generate the same output voltage vector. For pre-selected Hbridges, some of them may generate output voltages opposite to the assumed direction. This results in the change of the dc-link voltages of these H-bridges in the opposite direction to the assumed direction in the ordering algorithm. Consequently, these algorithms are characterized by undue constraints and narrow possibilities of dc-link voltage balancing. In the proposed control algorithm, CHB ML inverter is treated as groups of successively activated three-level inverters; depending on the length of the reference voltage vector. These 3-level inverters consist of 3 H-bridges selected from each phase. The proposed extended selection method enables firmgrip control of the dc-link voltages. For a given direction of phase currents, the possibility of using H-bridges with lowest and highest dc-link voltages is simultaneously analyzed. Additionally, each of the three-level inverters is controlled by one of 3 proposed alternative modulation methods for which both the attainable output voltage vectors and unbalanced dc-link voltages are predicted. Simulation and experimental results confirm the correctness of the algorithm execution.

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“…Finally, a new method was presented in [ 31 ] to control all the DC-Link voltages independently without interfering with the grid current. It has later been expanded in [ 32 ] to further consider a power set point for modules comprising ultra-capacitors or other ESSs. This method considers all freedom degrees and calculates the optimal output of each module without having to iterate through all the possibilities, thus reducing the computational cost.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the present paper explores more deeply the effect of tuning and configuring the method. This was not performed in [ 31 ], where all modules were considered to be equal and only superficially considered in [ 32 ], where modules difference was very limited. In the present paper, several tests were run where modules were treated differently, showing the effect of different settings combinations.…”

Section: Introductionmentioning

confidence: 99%

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

Cited by 6 publications

References 21 publications

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

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

Space Vector Pulsewidth Modulation Strategy for Multilevel Cascaded H-Bridge Inverter With DC-Link Voltage Balancing Ability

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

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