A Novel Virtual Space Vector Modulation Strategy for the Neutral-Point Potential Comprehensive Balance of Neutral-Point-Clamped Converters

Zhang, Chuanjin; Tang, Yuanjun; Han, Dongxue; Zhang, Hui; Zhang, Xiao; Wang, Ke

doi:10.6113/jpe.2016.16.3.946

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…e relation between the DC-link capacitor voltages (V c1 , V c2 ) and DC-link capacitor currents (i c1 , i c1 ) is provided as follows [34][35][36][37][38]:…”

Section: E Self-balancing Mechanismmentioning

confidence: 99%

Virtual Space Vector Pulse Width Modulation for Asymmetric T-Type Neutral Point Clamped 3-Level Inverter

Doan

Nguyen

2021

Mathematical Problems in Engineering

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This paper proposes a novel 3-phase asymmetric 3-level T-type NPC inverter and studies its PWM performance using a virtual space vector pulse width modulation control strategy. Firstly, the mathematical model and characteristics of this economical topology are described. Then, a virtual space vector approach is proposed to build a space vector diagram for designing SVPWM control. Similar to the conventional 3-level NPC inverter, the asymmetric inverter can also work with the neutral point voltage self-balancing in a fundamental period, which enables employment of this topology in various applications. Finally, simulation and experiment results under different load conditions have shown good output performance of the asymmetric 3-level topology. Similar tests are also performed on both conventional 2-level and 3-level inverters for comparison. For an almost similar number of different voltage vectors in the space vector diagram, the asymmetric 3-level topology can compete with conventional 3-level inverters for low-cost applications. The obvious benefit of the asymmetric 3-level inverter is a smaller number of switches devices while it can achieve output performance similar to that of the conventional 3-level. The comparative investigation also shows that the total loss given by SVPWM for the asymmetric 3-level configuration is lower than that of the traditional 3-level inverter.

show abstract

“…e relation between the DC-link capacitor voltages (V c1 , V c2 ) and DC-link capacitor currents (i c1 , i c1 ) is provided as follows [34][35][36][37][38]:…”

Section: E Self-balancing Mechanismmentioning

confidence: 99%

Virtual Space Vector Pulse Width Modulation for Asymmetric T-Type Neutral Point Clamped 3-Level Inverter

Doan

Nguyen

2021

Mathematical Problems in Engineering

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show abstract

“…However, its algorithm is complex and not easy to implement. In [22], [24], [25], novel modified SVPWM strategies are proposed to solve the neutral point voltage problem. In [30], a novel controller is proposed by intentionally re-injecting a third-harmonic NP current pattern with a gain modification.…”

Section: Introductionmentioning

confidence: 99%

A Neutral-Point Voltage Balance Controller for the Equivalent SVPWM Strategy of NPC Three-Level Inverters

Lyu¹,

Hu²,

Wu³

et al. 2016

Journal of Power Electronics

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Based on the space vector pulse width modulation (SVPWM) theory, this paper realizes an easier SVPWM strategy, which is equivalently implemented by CBSPWM with zero-sequence voltage injection. The traditional SVPWM strategy has no effect on controlling the neutral-point voltage balance. In order to solve the neutral-point voltage unbalance problem for neutral-point-clamped (NPC) three-level inverters, this paper proposes a neutral-point voltage balance controller. The proposed controller realizes controlling the neutral-point voltage balance by dynamically calculating the offset superimposed to the three-phase modulation waves of an equivalent SVPWM strategy. Compared with the traditional SVPWM strategy, the proposed neutral-point voltage balance controller has a strong ability to balance the neutral-point voltage, has good steady-state performance, improves the output waveforms quality and is easy for digital implementation. An experiment has been carried out on a NPC three-level inverter prototype based on a digital signal processor-complex programmable logic device (DSP-CPLD). The obtained experimental results verify the effectiveness of the proposed neutral-point voltage balance controller.

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“…Like any other NPC inverter, the neutral-point (NP) potential of the SL Zsource three-level inverter must be balanced. Various NP potential balancing methods were proposed for conventional NPC inverters [10][11][12][13][14][15][16][17], most of them alter redundant small vector durations so that the average neutral wire current becomes zero and thus the NP potential is balanced. In [18], a space vector modulated NP potential balancing method is proposed for Z-source three-level Ttype inverter.…”

Section: Introductionmentioning

confidence: 99%

Neutral-point Potential Balancing Method for Switched-Inductor Z-Source Three-level Inverter

Wang¹,

Zhang²

2017

Journal of Electrical Engineering and Technology

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-Switched-inductor (SL) Z-source three-level inverter is a novel high power topology. The SL based impedance network can boost the input dc voltage to a higher value than the single LC impedance network. However, as all the neutral-point-clamped (NPC) inverters, the SL Z-source threelevel inverter has to balance the neutral-point (NP) potential too. The principle of the inverter is introduced and then the effects of NP potential unbalance are analyzed. A NP balancing method is proposed. Other than the methods for conventional NPC inverter without Z-source impedance network, the upper and lower shoot-through durations are corrected by the feedforward compensation factors. With the proposed method, the NP potential is balanced and the voltage boosting ability of the Z-source network is not affected obviously. Simulations are conducted to verify the proposed method.

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A Novel Virtual Space Vector Modulation Strategy for the Neutral-Point Potential Comprehensive Balance of Neutral-Point-Clamped Converters

Cited by 8 publications

References 27 publications

Virtual Space Vector Pulse Width Modulation for Asymmetric T-Type Neutral Point Clamped 3-Level Inverter

Virtual Space Vector Pulse Width Modulation for Asymmetric T-Type Neutral Point Clamped 3-Level Inverter

A Neutral-Point Voltage Balance Controller for the Equivalent SVPWM Strategy of NPC Three-Level Inverters

Neutral-point Potential Balancing Method for Switched-Inductor Z-Source Three-level Inverter

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