Unbalanced Active Power Distribution of Cascaded Multilevel Converter-Based Battery Energy Storage Systems

Liang, Gaowen; Farivar, Glen G.; Ceballos, Salvador; Tafti, Hossein Dehghani; Pou, Josep; Townsend, Christopher D.; Konstantinou, Georgios

doi:10.1109/tie.2021.3137442

Cited by 18 publications

(9 citation statements)

References 22 publications

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“…The simulated model uses the parameters shown in Table III and Table IV in order to replicate the hardware prototype. In the simulations, the semiconductor's ON-state voltage is modelled linearly as described in (6). Both losses are dynamically calculated during the simulation.…”

Section: A Simulation Model Representing the Hardware Prototypementioning

confidence: 99%

“…In order to estimate this value in an online setup, a recursive least square (RLS) estimator is proposed. This estimator extracts both the slope (r CE ) and the intersection (v CE,i C0 ) of (6). Even though the estimated value of v CE,i C0 is not needed, it must be included in the linear model so that a correct representation of the system is provided to the estimator.…”

Section: B Measurement Noise and Extraction Of The On-state Resistancementioning

confidence: 99%

“…For controlling the frequency response, an enhanced STATCOM is needed. This family of STATCOMs is equipped with a form of energy storage system that allows for temporary active power exchange between the STATCOM and the power grid [4]- [6]. Modern high-voltage and high-power STATCOMs are based on a modular multilevel converter (MMC) topology, where a string of series connected submodules (SMs) are used to improve the harmonic performance of the generated output voltage, reduce the overall converter losses, and reduce the electromagnetic interference by lowering the generated dv/dt in the system.…”

Section: Introductionmentioning

confidence: 99%

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Accurate Condition Monitoring of Semiconductor Devices in Cascaded H-Bridge Modular Multilevel Converters

Asoodar¹,

Nahalparvari²,

Zhang

et al. 2023

IEEE Trans. Power Electron.

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This paper presents an online condition monitoring (CM) scheme for semiconductors used in modular multilevel converters (MMCs) that comprise cascaded H-bridge submodules. The CM algorithm is based on detecting changes in the ONstate resistance of the semiconductors over time. The proposed method is shown to successfully perform a curve-tracing of semiconductors in MMCs while the semiconductor junction remains at a temperature that is readily measurable and undergoes minute changes during the measurement process. The ON-state resistance value is estimated from the measured ON-state voltage drop of the semiconductors and the measured arm current. Measuring the ON-state resistance at known temperatures allows for separating temperature-dependent variations of the ONstate resistance from age-dependent variations of this parameter. Suitable methods for reducing the effect of noise on the curvetraced data are proposed, and a recursive least square (RLS) estimator is used to extract the optimum ON-state resistance from the traced vCE − iC curve. Simulation results show that the proposed scheme can accurately determine the ON-state resistance of semiconductors at a known temperature and under various levels of measurement noise. Moreover, experimental results on a low-power prototype show that the proposed scheme is applicable in practice, and provides similar online curves to what a commercial curve tracer can produce offline. The experimental verification has been conducted under constant load conditions; however, the proposed methods can be used under any variable load condition as well.

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Section: A Simulation Model Representing the Hardware Prototypementioning

confidence: 99%

Section: B Measurement Noise and Extraction Of The On-state Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Accurate Condition Monitoring of Semiconductor Devices in Cascaded H-Bridge Modular Multilevel Converters

Asoodar¹,

Nahalparvari²,

Zhang

et al. 2023

IEEE Trans. Power Electron.

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“…Besides, according to (32), each updated reference P * j2 is below P m+1 max − P m max . According to the existing analysis in [25], it can be proved that:…”

Section: Disparity Constraints Incorporationmentioning

confidence: 99%

A Constrained Intersubmodule State-of-Charge Balancing Method for Battery Energy Storage Systems Based on the Cascaded H-Bridge Converter

Liang

Rodriguez

Farivar

et al. 2022

IEEE Trans. Power Electron.

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“…Therefore, the CHB is connected to the main grid, and it operates as an active rectifier to provide the difference in power needed for battery charging. One of the advantages of this configuration relies on the possibility of splitting the storage system into smaller units each of which is connected to the separate dc-links of the CHB circuit, leading to a distributed storage system [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Inverter Operation Mode of a PhotoVoltaic Cascaded H-Bridge Battery Charger

et al. 2023

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The paper deals with a grid-connected single-phase battery charger integrated with photovoltaic generators (PVGs). The circuit topology consists of a multilevel architecture based on a Cascaded H-Bridge (CHB) rectifier. Its main task is to charge the batteries, primarily from the PVGs, by also assuring to keep their state-of-charge (SOC) balanced. Nevertheless, when the battery SOC overcomes a predefined upper limit, beyond which the charging process could be interrupted, the available PV power can no longer be transferred to the batteries. Therefore, to avoid an undesired curtailment of PV power production, this latter can be supplied to the grid by inverting the system operation. The paper shows how to achieve this result by implementing a dedicated control action based on a multi-step procedure. Numerical investigations are carried out on a 19-level CHB converter implemented in the PLECS environment to validate the feasibility and effectiveness of the proposed control technique.

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Unbalanced Active Power Distribution of Cascaded Multilevel Converter-Based Battery Energy Storage Systems

Cited by 18 publications

References 22 publications

Accurate Condition Monitoring of Semiconductor Devices in Cascaded H-Bridge Modular Multilevel Converters

Accurate Condition Monitoring of Semiconductor Devices in Cascaded H-Bridge Modular Multilevel Converters

A Constrained Intersubmodule State-of-Charge Balancing Method for Battery Energy Storage Systems Based on the Cascaded H-Bridge Converter

Inverter Operation Mode of a PhotoVoltaic Cascaded H-Bridge Battery Charger

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