A Method for the Suppression of Fluctuations in the Neutral-Point Potential of a Three-Level NPC Inverter With a Capacitor-Voltage Loop

Abstract

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A neutral point potential control for three‐level neutral‐point‐clamped converters based on the search optimization method of the two degrees of freedom

“…where T s is the control period. Therefore, the v o means that it is necessary to generate a negative neutral point current (i oc ) as (4) using some method [7][8][9][10][11][12][13] to compensate i o :…”

“…The low-frequency NPP fluctuation problem may appear under a Correspondence to: Bo Guan. E-mail: guanbo_1989@nagoya-u.jp; guanbo_1989@yahoo.co.jp Department of Information and Communication Engineering, Graduate School of Engineering, Nagoya University, Furocho, Chikusa-ku Nagoyashi, Aichi, 464-8603, Japan all modulation methods based on the nearest-three-vector pulse width modulation (NTV-PWM) [11][12][13][14], such as sinusoidal PWM (SPWM), space vector PWM (SVPWM), and selective harmonic elimination PWM (SHEPWM). It makes the capacitor reduction difficult, as it is important to decrease the volume and weight of the converter.…”

“…It causes a low-frequency NPP fluctuation under some special operating conditions. References [11][12][13][14] analyze the natural balance characteristics and the full control domain of the NPP.…”

A Modified Neutral Point Balancing Space Vector Modulation for Three-Level Neutral Point Clamped Converters in High-Speed Drives

“…To suppress the 3 rd harmonic NP voltage ripple, carrier based pulse width modulation methods typically adopts variable common mode voltage injection [17][18] whereas nearest-three-vector (NTV) space vector modulation (SVM) methods tend to manipulate the redundant small vectors [11]. These methods work effectively at low to medium modulation index and high power factor operation conditions.…”

Optimal Performance Design Guideline of Hybrid Reference Frame Based Dual-Loop Control Strategy for Stand-Alone Single-Phase Inverters

“…The proportional-resonant (PR) control method is popular for the single-phase inverters thanks to the ability to eliminate the tracking error while regulating the AC signals [22], [23]. When tracking a sinusoidal reference, this control strategy does not require decoupling structures and it is able to ensure the system with zero steady-state error at a frequency even with the variations of the circuit parameters [24], [25].…”