Grid-connected Self-synchronizing Cascaded H-Bridge Inverters with Autonomous Power Sharing

Dutta, Soham; Lu, Ming–Feng; Majmunović, Branko; Mallik, Rahul; Seo, Gab-Su; Maksimović, Dragan; Johnson, Brian

doi:10.1109/ecce47101.2021.9595186

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…The reference data sets generated from the algorithm are reliable since the original models are based on common approaches that are widely accepted in the literature, and also they have been validated for the modular multilevel architecture for the case study in the prior works. Reference [33] validated topological feasibility, [40] substantiated control, and [36] provided loss and efficiency models. They include experimental results for the architecture as well as experimental validation of the loss Based on the discussion, the performance of the GP optimization is evaluated by comparing with the exhaustive search.…”

Section: B Optimization Resultsmentioning

confidence: 89%

“…Step I, integer variables are as noninteger, we obtain the optimal points solving the relaxed GP problems. As shown in (40) and (41), ϕ is clustered in a copper loss model fitting. The number of optimization problems generated is equal to the number of clusters in the copper loss fitting, and the solution can be obtained by solving each problem and selecting the solution that maximizes the LCOE improvement factor among them.…”

Section: ) Gp Optimization Modelmentioning

confidence: 99%

“…Next, N t,XF /m XF is rounded to maintain the turns ratio of the transformer n T R = N t,sec /N t,XF at its optimal value from Step I. As shown in (29), the transformer turns ratio determines the dc-link voltage and thus the switch Pre-optimization tasks: -Posynomial system modeling as in (40) -Determination of system ratings and parameters Relaxation of integer free variables in (40) ( voltage ratings required. Consequently, it would determine the switching loss and cost of the switches.…”

Section: ) Gp Optimization Modelmentioning

confidence: 99%

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Levelized Cost of Energy-Oriented Modular String Inverter Design Optimization for PV Generation System Using Geometric Programming

et al. 2022

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Levelized cost of energy (LCOE) is a commonly used metric to assess the cost-to-benefit ratio over the lifetime of an energy resource such as photovoltaics (PV). However, power electronics engineers tend to rely on metrics such as efficiency and power density which do not guarantee lifetime cost optimality. Recent work has shown that an LCOE-focused optimization approach can yield improved system designs, leading to improved lifetime performance with balanced lifetime cost and energy generation. This paper outlines an LCOE optimization framework for PV power electronics that uses geometric programming. The large number of circuit parameters and nonlinear nature of the system equations pose significant barriers. Our approach allows for decoupling of design variables which in turn enables superior computational efficiency and a near-optimal solution. By incorporating the power electronics design process and magnetic loss mechanism into the convex design framework, the optimization engine yields practically implementable parameters for a PV converter that minimizes LCOE. An optimization example for a cascaded modular PV inverter architecture is presented that suggests 3.35% LCOE improvement can be achieved by the new power electronics and the advanced optimization. The proposed optimization framework can be applied to other power generation systems to evaluate the effect of the power electronics design on system lifetime costs and efficiency.INDEX TERMS Convex optimization, geometric programming, levelized cost of energy, lifetime energy cost, magnetic loss modeling, solar inverters, modular multilevel converter.

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Section: B Optimization Resultsmentioning

confidence: 89%

Section: ) Gp Optimization Modelmentioning

confidence: 99%

Section: ) Gp Optimization Modelmentioning

confidence: 99%

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Levelized Cost of Energy-Oriented Modular String Inverter Design Optimization for PV Generation System Using Geometric Programming

et al. 2022

Self Cite

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“…Existing solutions include zerosequence current injection [5] and zero-sequence voltage injection [6], but these schemes have limited compensation capabilities [7]. In order to address the issue of interphase power imbalance thoroughly, researchers proposed a twostage converter combining quadruple active bridge (QAB) converters and CHB inverters [8][9][10][11][12][13][14][15][16]. Attractive features of this two-stage converter include: 1) the output power of a single PV module is evenly distributed among the three phases, thereby achieving natural power balance between phases; 2) the double-line-frequency fluctuating power of the H-bridge inverter unit is offset in the four-winding transformer to avoid the use of bulky capacitors; 3) the use of high-frequency isolation transformers completely solves the common mode leakage current problem of PV panels.…”

Section: Introductionmentioning

confidence: 99%

An AC Voltage Balancer and its Improved Modulation Strategy for CHB Based PV Inverters

Jiang,

Zhao,

Yang

et al. 2023

IEEE Open J. Power Electron.

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Cascaded H-bridge (CHB) inverters have been widely used in distributed photovoltaic (PV) power generation systems due to their attractive features in terms of power quality and easy to expand compared to two-level or three-level inverters. Especially the modular inverters with an interphase structure composed of four-port isolated DC/DC converters and CHB inverters are preferred by academia and industry because it can naturally balance the power difference between phases. However, such modular inverters still suffer from some issues that need to be addressed, such as power mismatch between modules within the same phase. This will lead to overmodulation of some Hbridge inverter units and grid-connected current distortion, and even threaten the safe and stable operation of the entire modular inverter. In view of this problem, an AC voltage balancer (ACVB) is proposed in this paper to achieve power balance between adjacent H-bridge inverter units. Furthermore, an improved modulation strategy is also presented to achieve soft switching of ACVB. Finally, the effectiveness of the proposed ACVB and its improved modulation strategy is verified by experimental results. 1

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Autonomous Control Schemes for Grid-Interfaced Series-Connected Low-Voltage Isolated PV Microinverter

Pal

Chattopadhyay

2023

2023 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Grid-connected Self-synchronizing Cascaded H-Bridge Inverters with Autonomous Power Sharing

Cited by 7 publications

References 21 publications

Levelized Cost of Energy-Oriented Modular String Inverter Design Optimization for PV Generation System Using Geometric Programming

Levelized Cost of Energy-Oriented Modular String Inverter Design Optimization for PV Generation System Using Geometric Programming

An AC Voltage Balancer and its Improved Modulation Strategy for CHB Based PV Inverters

Autonomous Control Schemes for Grid-Interfaced Series-Connected Low-Voltage Isolated PV Microinverter

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