Neutral-Point Potential Balancing of a Five-Level Active Neutral-Point-Clamped Inverter

Wang, Kui; Zheng, Zedong; Li, Yongdong; Ke-an, Liu; Shang, Jing

doi:10.1109/tie.2012.2227898

Cited by 139 publications

(45 citation statements)

References 29 publications

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“…(20) From (18) to (20), the variable Δd x can be calculated according to the floating-capacitor voltage deviations and the directions of the load currents, and Δd x is represented by:…”

Section: Active Voltage-balancing Control Of Floating Capacitorsmentioning

confidence: 99%

“…However, this control strategy is not suitable for real-time control and may lead to the large capacitor voltage ripple due to the low switching frequency. A phase-disposition PWM (PD-PWM) with zero-sequence voltage injection method for five-level ANPC converter is proposed in [20]. However, the selection of the appropriate zero-sequence voltage is very complicated because the average neutral-point currents for all of the key zero-sequence voltages need to be calculated.…”

Section: Introductionmentioning

confidence: 99%

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Active Voltage-balancing Control Methods for the Floating Capacitors and DC-link Capacitors of Five-level Active Neutral-Point-Clamped Converter

Li¹,

Jiang²

2017

Journal of Power Electronics

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Multilevel active neutral-point-clamped (ANPC) converter combines the advantages of three-level ANPC converter and multilevel flying capacitor (FC) converter. However, multilevel ANPC converter often suffers from capacitor voltage balancing problems. In order to solve the capacitor voltage balancing problems for five-level ANPC converter, phase-shifted pulse width modulation (PS-PWM) is used, which generally provides natural voltage balancing ability. However, the natural voltage balancing ability depends on the load conditions and converter parameters. In order to eliminate voltage deviations under steady-state and dynamic conditions, the active voltage-balancing control (AVBC) methods of floating capacitors and dc-link capacitors based on PS-PWM are proposed. First, the neutral-point current is regulated to balance the neutral-point voltage by injecting zero-sequence voltage. After that, the duty cycles of the redundant switch combinations are adjusted to balance the floating-capacitor voltages by introducing moderating variables for each of the phases. Finally, the effectiveness of the proposed AVBC methods is verified by experimental results.

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“…(20) From (18) to (20), the variable Δd x can be calculated according to the floating-capacitor voltage deviations and the directions of the load currents, and Δd x is represented by:…”

Section: Active Voltage-balancing Control Of Floating Capacitorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Active Voltage-balancing Control Methods for the Floating Capacitors and DC-link Capacitors of Five-level Active Neutral-Point-Clamped Converter

Li¹,

Jiang²

2017

Journal of Power Electronics

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“…Vao Symetrical phase applications, which cannot be solved using a three phase technique such as adding zero-sequence voltage [13]. Applying unsymmetrical switching pattern in each half cycle can overcome unbalancing problems, however it will reduce the quality of the converter output.…”

Section: Phase Voltage Vaomentioning

confidence: 99%

“…Proper switching vectors between available redundancies are selected to control the FC voltages and to achieve balanced dc-link capacitor voltages. In [13] and [14], an optimum zero-sequence voltage is added to obtain balanced dc-link voltages. These methods are normally suitable for three-phase applications.…”

Section: Introductionmentioning

confidence: 99%

A Novel Modulation Technique and a New Balancing Control Strategy for a Single-Phase Five-Level ANPC Converter

Teymour

Sutanto

Muttaqi

et al. 2015

IEEE Trans. on Ind. Applicat.

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This paper proposes a novel modulation technique and a new balancing control strategy for a single-phase five-level flying-capacitor (FC)-based active-neutral-point-clamped (ANPC) converter. The proposed modulator can control the FC voltage to follow the requested reference value and simultaneously generate the required ac output voltage regardless of the values of the dc capacitor voltages of the converter. By implementing this method, smaller values of the dc-link capacitor and FC can be used even in applications that could experience ripple or transient in the capacitor voltage. In a single-phase five-level ANPC converter applications, where the capacitors can experience pulsation power and dc-link balancing issues, such as gridconnected photovoltaic system, the selection of the reference voltage value for the FC can play an important role to balance the average values of the dc-link capacitor voltage. The proposed new control strategy uses a new reference voltage for the FC to be applied by the new modulator to have an average balanced dc-link voltages as well as an ac output voltage with good power quality. Simulation studies and experimental results demonstrate the effectiveness of the proposed modulation technique and control strategy even with relatively small dc capacitors to produce high-quality output voltage and current waveforms while maintaining an average balanced dc-link voltages.

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“…Correspondingly, the operating regions are enlarged in FC converters, in which different voltage levels are clamped by FCs in each phase. However, massive FCs are required as voltage level increases, thus increasing the cost and control complexity [17]. According to the aforementioned drawbacks of NPC and FC, low-level converters are commercially used in industrial applications, such as the 3L-NPC and 4L-FC [18].…”

Section: Introductionmentioning

confidence: 99%

Novel Five-Level Three-Phase Hybrid-Clamped Converter with Reduced Components

Chen¹,

Yao²,

Liu³

2014

Journal of Power Electronics

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This study proposes a novel five-level three-phase hybrid-clamped converter composed of only six switches and one flying capacitor (FC) per phase. The capacitor-voltage-drift phenomenon of the converter under the classical sinusoidal pulse width modulation (SPWM) strategy is comprehensively analyzed. The average current, which flows into the FC, is a function of power factor and modulation index and does not remain at zero. Thus, a specific modulation strategy based on space vector modulation (SVM) is developed to balance the voltage of DC-link and FCs by injecting a common-mode voltage. This strategy applies the five-segment method to synthesize the voltage vector, such that switching losses are reduced while optional vector sequences are increased. The best vector sequence is then selected on the basis of the minimized cost function to suppress the divergence of the capacitor voltage. This study further proposes a startup method that charges the DC-link and FCs without any additional circuits. Simulation and experimental results verify the validity of the proposed converter, modulation strategy, and precharge method.

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Neutral-Point Potential Balancing of a Five-Level Active Neutral-Point-Clamped Inverter

Cited by 139 publications

References 29 publications

Active Voltage-balancing Control Methods for the Floating Capacitors and DC-link Capacitors of Five-level Active Neutral-Point-Clamped Converter

Active Voltage-balancing Control Methods for the Floating Capacitors and DC-link Capacitors of Five-level Active Neutral-Point-Clamped Converter

A Novel Modulation Technique and a New Balancing Control Strategy for a Single-Phase Five-Level ANPC Converter

Novel Five-Level Three-Phase Hybrid-Clamped Converter with Reduced Components

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