Experimental verification of direct dead-time Control and DC-link neutral-point balancing of a three level neutral-point-clamped (3L-NPC) VSC

Sprenger, Michael; Barth, Tobias; Alvarez, Rodrigo; Tannhaeuser, Marvin; Bernet, Steffen

doi:10.1109/ecce.2013.6646730

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…Since each of the virtual space vectors leads to zero neutral point current as a consequence of the chosen linear combinations, this approach is also applicable for the entire range of the modulation index and for low power factors according to [37], [43]. Other approaches replace vectors that affect the neutral point current with vectors that do not [44] or use variable dead times to control the neutral point voltage [45]. For carrier-based modulation strategies such as sinusoidal pulse width modulation (SPWM), the injection of an offset voltage to the carrier signals creates an asymmetry in the PWM pulses of both half-cycles.…”

Section: B Neutral Point Balancing Strategies For 3-level Inverters I...mentioning

confidence: 99%

A Neutral Point Balancing and Voltage Error Compensation Approach for Fault-Tolerant 3-Level Inverters

Häring,

Hepp,

Wondrak

et al. 2024

IEEE Open J. Power Electron.

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Neutral point clamped inverters, such as NPC, ANPC, or T-Type inverters, have emerged as competitive solutions for specific automotive traction applications due to the increase in DC-link voltage levels up to 800 V. Besides improved harmonic performance, certain 3-level inverter structures can provide a reconfigured failure mode operation in case of a semiconductor failure by applying a permanent neutral point connection in the faulty phase leg. This feature is a vital factor in the design of traction inverters, particularly in the context of fault-tolerant autonomous vehicles. During failure mode operation, none of the neutral point balancing techniques found in current literature are practical. Addressing this issue is crucial since the neutral point stress is high in this mode of operation. Therefore, this paper investigates the impact of stationary and dynamic neutral point voltage deviations on the motor flux in electric machines and offers a compensatory strategy for these errors. Furthermore, a new neutral point control method is presented that balances stationary neutral point voltage deviations by using a phase angle dependent voltage shift in the α/β-plane. All proposed strategies are first discussed theoretically and then verified by simulation and measurements on an 800 V IPMSM machine test bench.

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Section: B Neutral Point Balancing Strategies For 3-level Inverters I...mentioning

confidence: 99%

A Neutral Point Balancing and Voltage Error Compensation Approach for Fault-Tolerant 3-Level Inverters

Häring,

Hepp,

Wondrak

et al. 2024

IEEE Open J. Power Electron.

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show abstract

“…Moreover, the neutral-point voltage is also influenced by the dead-time due to the neutral-point currents as shown in Fig. 4 [35]. With the aim to explicate this impact, the transition state from ''-1'' to ''0'' with i ag < 0 is considered as an illustration ( Fig.…”

Section: Average Voltage and Current Compensations Of Prediction Mmentioning

confidence: 99%

Lyapunov-Induced Model Predictive Power Control for Grid-Tie Three-Level Neutral-Point-Clamped Inverter With Dead-Time Compensation

Ngo

Pham

et al. 2019

IEEE Access

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In this paper, a new power control strategy based on a model predictive power control for the grid-tie three-level neutral point clamped inverter is presented. A dynamical model based on the orientation of grid voltage is used to predict the performance of control variables required for the system. A cost function that includes the tracking power ability, the neutral-point voltage balancing and switching frequency reduction is used to achieve the optimal switching state. A proposed selection scheme of control input is introduced to comprehend the stability of the closed-loop system and reduce the computational cost. At each sampling time, only candidate switching state inputs that guarantee the stability condition through a control Lyapunov function is evaluated in the cost function of the MPC algorithm. Thus, the execution time is remarkably decreased by 26% in comparison with traditional model predictive control. Moreover, the deadtime effect is compensated by incorporating its influence in the proposed prediction model. Simulation and experimental results compared with the traditional model predictive control are used to confirm the effectiveness of the proposed scheme. INDEX TERMS Computational burden, control Lyapunov function, dead-time compensation, finite control set model predictive control, stability conditions, three-level neutral-point-clamped inverter. NOMENCLATURE C 1 , C 2 , C dc DC-link capacitance. i g , u g Grid current and voltage. i z Neutral-point current. K d , K q Positive gains of Lyapunov function. L f , R f Filter inductance and resistance. ω Grid voltage angular frequency. θ Grid voltage angle in the stationary frame. λ uz , λ sw Weighting factor of voltage balance, switching frequency reduction. P g , Q g Grid active and reactive powers. The associate editor coordinating the review of this manuscript and approving it for publication was Alfeu J. Sguarezi Filho. S x Switching state of the 3L-NPC inverter. t d , t on , t off Dead-time, turn-on/off time of IGBT. T s Sampling time of the controller. u inv Inverter output voltage. U dc DC-bus voltage. u z Neutral-point voltage. SUPERSCRIPTS * Reference value. p Predicted value. SUBSCRIPTS d, q d, q axis of grid voltage oriented reference frame. α, β α, β axis of stationary reference frame.

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Model Predictive Direct Power Control of Doubly Fed Induction Generator with Dead-Time Compensation

et al. 2017

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Experimental verification of direct dead-time Control and DC-link neutral-point balancing of a three level neutral-point-clamped (3L-NPC) VSC

Cited by 7 publications

References 13 publications

A Neutral Point Balancing and Voltage Error Compensation Approach for Fault-Tolerant 3-Level Inverters

A Neutral Point Balancing and Voltage Error Compensation Approach for Fault-Tolerant 3-Level Inverters

Lyapunov-Induced Model Predictive Power Control for Grid-Tie Three-Level Neutral-Point-Clamped Inverter With Dead-Time Compensation

Model Predictive Direct Power Control of Doubly Fed Induction Generator with Dead-Time Compensation

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