Simple comparison of different PWM strategies for a three-level H-bridge flying capacitor converter

Ruderman, Alex; Reznikov, Boris

doi:10.1109/optim.2010.5510393

Cited by 16 publications

(4 citation statements)

References 16 publications

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“…But its estimate is in concordance with the measured value. Furthermore, Table 3 shows the average voltage and maximum voltage ripple, ΔV c Max , of the estimated and measured voltages; the theoretical maximum voltage ripple is given by Equation (20). As shown, the estimated and measured values are similar; the average values of the estimated and measured voltages are both in close concordance with the value defined in Equation ( 21), which confirms the good performance of the estimation scheme.…”

Section: Test Condition Thd V [%] Thd I [%] E V C [V ] E I [A]supporting

confidence: 58%

“…Estimated and measured voltages with uncertain capacitance, C = 0.77C nom : Average voltage and maximum voltage ripple (ΔV c Max )Equation(21), which means that the estimated values are accurate. Moreover, considering the measurement noise, the voltage ripples are in concordance with Equation(20), which defines the maximum voltage ripple in the capacitors.…”

mentioning

confidence: 84%

“…These applications demonstrate the potential of the FCMC using a high number of levels, where the property of natural balance is used to achieve the required voltage at each capacitor. Several works have studied this property, and proposed techniques to improve its dynamics, especially at start-up when the input dc voltage increases from zero to nominal value [19][20][21][22]. Furthermore, closed-loop strategies are used to improve the capacitor voltage balancing dynamics [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Estimation of the capacitor voltages in flying capacitor multi‐level converters

Escalante

Erdmann

2021

IET Power Electronics

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Flying capacitor multi‐level converters use charged capacitors as a critical element. For proper operation, the capacitor voltages must be known and regulated. Direct measurement is straightforward, but when the number of required measurements is high, this is a complicated approach. This paper introduces an estimation method for n capacitor voltages. The scheme is based on a system of (n+1) equations, which is defined in a way that it incorporates information of the actual capacitor voltages and open‐loop estimates of the capacitor voltages. The solution of the system gives the best estimates of the capacitor voltages in the sense of least square errors. The method requires only output voltage and output current sensors and its computational burden is low, saving cost and design efforts, and simplifying the hardware system. The performance of the proposed scheme is evaluated experimentally in a 9‐level flying capacitor chopper, where the estimates are used by the voltage balancing strategy and by the output current controller.

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Section: Test Condition Thd V [%] Thd I [%] E V C [V ] E I [A]supporting

confidence: 58%

mentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

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Estimation of the capacitor voltages in flying capacitor multi‐level converters

Escalante

Erdmann

2021

IET Power Electronics

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“…For a 3-level HB FCC, the problem of poorly damped natural balancing dynamics for small DC voltage commands/AC modulation indices is resolved by another PS PWM ( [11], [12]). For a 5-level single-leg FCC, the similar problem ( [13]) solution required more exotic modified PWM ( [14]).…”

Section: Introductionmentioning

confidence: 99%

PWM Strategy for improved natural balancing of a four-level H-bridge Flying Capacitor Converter

Ibrayeva

Ten

Familianty

et al. 2015

2015 Intl Aegean Conference on Electrical Machines &Amp; Power Electronics (ACEMP), 2015 Intl Conference on Optimization of Ele

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Flying capacitor based multilevel PWM converter may be an attractive choice due to the natural balancing property of the capacitor voltages. Previous research on natural balancing of a 4-level H-bridge Flying Capacitor Converter (FCC) with Phase Shifted (PS) PWM showed slow natural balancing rate for small modulation indices. Theoretical natural balancing time constant becomes infinitely large for zero output voltage (modulation index). This was probably the reason that many researchers became interested in active balancing methods for this and other capacitive multilevel voltage source inverters. The paper addresses natural voltage balancing improvement possibilities by employing modified PWM strategies different from classical PS PWM. Dramatic improvement in natural voltage balancing rate for small output voltages is achieved due to making a better use of switching states redundancy. Suggested is a family of improved PWM strategies and the best strategy is identified based on natural balancing damping rate considerations. Natural balancing mechanisms are analyzed using time domain averaging methodology that results in simple easy to interpret expressions regarding parameter influence.

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Cascaded Packed U-Cell STATCOM With Low Capacitance And Its Third Harmonic Control

Niu

Gao

et al. 2020

2020 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Simple comparison of different PWM strategies for a three-level H-bridge flying capacitor converter

Cited by 16 publications

References 16 publications

Estimation of the capacitor voltages in flying capacitor multi‐level converters

Estimation of the capacitor voltages in flying capacitor multi‐level converters

PWM Strategy for improved natural balancing of a four-level H-bridge Flying Capacitor Converter

Cascaded Packed U-Cell STATCOM With Low Capacitance And Its Third Harmonic Control

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