A control strategy for a five-level double converter with adjustable DC link voltage

Ishida, Takashi; Miyamoto, Takeru; Oota, Toshifumi; Matsuse, Kouki; Sasagawa, K.; Huang, Ling

doi:10.1109/ias.2002.1044136

Cited by 25 publications

(7 citation statements)

References 7 publications

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“…Thus an improved control strategy using the space vector PWM has also been proposed. The improved control strategy is able to solve the voltage ripples in the dc link [9] [10]. Similar voltage balancing technique have also been discussed in [11] [12].…”

Section: Dpt (Rrihegnhng / Stt4kslymentioning

confidence: 98%

A Novel SPWM Method with Voltage Balancing Capability for Multilevel Rectifier/Inverter Systems

ghuoPan

Peng

2007

APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition

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This paper presents a novel SPWM control method with voltage balancing capability for the diodeclamped multilevel rectifier/inverter system. A complete analysis of the voltage balance theory based on a 5-level back-to-back converter is given. The voltage balancing effects of the triplen harmonic offset voltage added to all three phase voltages are discussed. The proposed control utilizes the offset voltage to control the average currents flowing into and out form the inner junction. The voltage balancing was achieved by selecting proper offset voltages for both sides. A 5-level experimental system has built up and used to prove the theory.I. IWROD UFDNIn recent years, multilevel converters have begun to play a more and more important role in high-voltage, high-power applications. Compared with the traditional two-level voltage converter, the primary advantage of multilevel converters is their smaller output voltage step, which results in higher power quality, lower harmonic components, higher voltage capability, better electromagnetic compatibility, and lowerThe multilevel converter synthesizes the staircase output voltage which approaches the sinusoidal waveform with minimum harmonics. In order to satisfy the same harmonics requirement, the frequency needed by the multilevel converter is much lower than the conventional converter. Therefore the multilevel converter can achieve higher efficiency. The multilevel converters also have lower dV'dt. It has been found recently that the high dV/dt in the high-power PWM converter can induce corona discharge and lead to bearing or winding insulation failure.The multiple dc bus capacitors provide the capability of output multilevel voltage waveform. However, it also requires additional circuits and special control methods to keep the capacitor voltages well balanced. Dpt. (RrIhEgnhng / Stt4ksly Ei fshg, M1824 For the three-level diode-clamped converter, because there is only one additional voltage junction, the neutral point, and the symmetry of the upper and lower capacitors, it also has self voltage balancing potential. However the neutral point has a low frequency ripple at three times of the fundamental frequency. Some new researches have addressed on eliminating or attenuating the low frequency ripple [3-6].However, the dc bus voltage balancing for diodeclamped multilevel converters with the number of levels greater than three is more complicate. The multilevel converter capacitors tend to overcharge or completely discharge. Eventually, the converter converges to a three-level converter. Corzine proposed a dc-dc front end to regulate the center capacitor voltage of a four-level converter [7]. PWM hysteresis control method has been proposed to regulate the dc bus of a five-level rectifier [8]. Then the multi-band hysteresis comparators control strategy has been extended to a five-level back-to-back system. Although the technique is simple, the characteristics are not sufficient as a motor drive system. Thus an improved control strategy using the space vector PWM has al...

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Section: Dpt (Rrihegnhng / Stt4kslymentioning

confidence: 98%

A Novel SPWM Method with Voltage Balancing Capability for Multilevel Rectifier/Inverter Systems

ghuoPan

Peng

2007

APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition

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“…There are two common approaches to obtain the on-times. The first approach is to determine the triangle and then solve three simultaneous equations for this triangle to obtain the on-times as in [9] whereas the second approach is to determine the triangle and then use the particular on-time equations stored in the lookup for this triangle, as in [10]. However, as the number of level increases, both of these approaches become computationally intensive.…”

Section: Introductionmentioning

confidence: 98%

Robust space vector modulation technique for unbalance voltage disturbances

Sarıbulut

Tümay

2010

Electric Power Systems Research

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“…0278-0046/$20.00 © 2006 IEEE There are two common approaches to obtain the on-times. The first approach is to determine the triangle, and then solve three simultaneous equations for this triangle to obtain the ontimes as in [4]. Whereas, the second approach is to determine the triangle, and then use the particular on-time equations stored in the lookup for this triangle, as in [5].…”

Section: Introductionmentioning

confidence: 99%

A Space Vector PWM Scheme for Multilevel Inverters Based on Two-Level Space Vector PWM

Gupta

Khambadkone

2006

IEEE Trans. Ind. Electron.

369

144

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Multilevel inverters are increasingly being used in high-power medium voltage applications due to their superior performance compared to two-level inverters. Among various modulation techniques for a multilevel inverter, the space vector pulsewidth modulation (SVPWM) is widely used. However, the implementation of the SVPWM for a multilevel inverter is complicated. The complexity is due to the difficulty in determining the location of the reference vector, the calculation of on-times, and the determination and selection of switching states. This paper proposes a general SVPWM algorithm for multilevel inverters based on standard two-level SVPWM. Since the proposed multilevel SVPWM method uses two-level modulation to calculate the on-times, the computation of on-times for an n-level inverter becomes easier. The proposed method uses a simple mapping to achieve the SVPWM for a multilevel inverter. A general n-level implementation is explained, and experimental results are given for three-level and five-level inverters.Index Terms-Multilevel inverter, neutral point clamped (NPC), space vector pulsewidth modulation (SVPWM), switching state, two-level inverter.

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A control strategy for a five-level double converter with adjustable DC link voltage

Cited by 25 publications

References 7 publications

A Novel SPWM Method with Voltage Balancing Capability for Multilevel Rectifier/Inverter Systems

A Novel SPWM Method with Voltage Balancing Capability for Multilevel Rectifier/Inverter Systems

Robust space vector modulation technique for unbalance voltage disturbances

A Space Vector PWM Scheme for Multilevel Inverters Based on Two-Level Space Vector PWM

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