Instantaneous Zero Sequence Voltage for Grid Energy Balancing Under Unbalanced Power Generation

Aguilera, Ricardo P.; Acuna, Pablo; Rojas, Christian A.; Konstantinou, Georgios; Pou, Josep

doi:10.1109/ecce.2019.8912472

Cited by 3 publications

(12 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…U Tk * after discounting the voltage corresponding to the desired power (14) v 0 Zero-sequence voltage 3 ( 3 p * k and v 0 belong to the method from [28] and are introduced on Section 3.2.2.) (17) V Gk Voltage 2 of the grid k-th phase ( 2 The sign criteria from Figure 1 is selected for the voltages and currents there defined.…”

Section: U Tkmentioning

confidence: 99%

“…Current of the k-th phase 2 ( 2 The sign criteria from Figure 1 is selected for the voltages and currents there defined.) k and v 0 belong to the method from [28] and are introduced on Section 3.2.2. )…”

Section: Conflicts Of Interestmentioning

confidence: 99%

“…where v 0 is the zero-sequence voltage and p 1 * , p 2 * , and p 3 * are the phase power references. The sign and scale are different from those in [28] because of the voltage sign criteria and the αβ transformation, which here is the power-invariant.…”

mentioning

confidence: 93%

“…In [ 2 , 27 ], triple voltage harmonics are added to balance the modules. Following this trend, a zero-sequence voltage can be included to guarantee the balance between the phase modules, as disclosed in [ 28 , 29 ]. However, these methods can only have a limited effect on the unbalance of the modules because they depend on the usage of the DC-Link voltages.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

Section: U Tkmentioning

confidence: 99%

Section: Conflicts Of Interestmentioning

confidence: 99%

mentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2021

View full text Add to dashboard Cite

show abstract

“…A similar approach was taken in [21], where the carrier waveform was modified with the same objective. Secondly, control techniques [22][23][24] are revised to add triple voltage harmonics or the zero-sequence with the aim of achieving balance. Finally, in some optimal control methods, such as [11,25], the objective functions were modified in order to include the balancing problem, benefitting from the redundancies.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

View full text Add to dashboard Cite

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.

show abstract

Optimal Common-Mode Voltage for Maximum Power Transfer of Grid-Tied PV CHB Inverters

Calderon

Angulo

Acuna

2021

IECON 2021 – 47th Annual Conference of the IEEE Industrial Electronics Society

View full text Add to dashboard Cite

Instantaneous Zero Sequence Voltage for Grid Energy Balancing Under Unbalanced Power Generation

Cited by 3 publications

References 26 publications

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

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

Optimal Common-Mode Voltage for Maximum Power Transfer of Grid-Tied PV CHB Inverters

Contact Info

Product

Resources

About