A Simplified Common-Mode Voltage Suppression and Neutral-Point Potential Control for the NPC Three-Level Inverter

Yuan, Qingqing; Qian, Jinyue; Liu, An

doi:10.1007/s42835-019-00293-9

Cited by 15 publications

(7 citation statements)

References 21 publications

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“…For the NPC three-level grid-connecting inverter, these capacitors' voltages u d1 and u d2 would be easily unbalancing because of various reasons. The conventional way to keep the neutral point potential balance is to control the current inflowing or outflowing of C 1 and C 2 , and the neutral point potential u mid ( u mid = |u d1 − u d2 |), can be represented as [3] d…”

Section: Mathematical Models Of the Npc Three-level Grid-connecting I...mentioning

confidence: 99%

“…For the NPC three‐level grid‐connecting inverter, these capacitors' voltages u d1 and u d2 would be easily unbalancing because of various reasons. The conventional way to keep the neutral point potential balance is to control the current inflowing or outflowing of C 1 and C 2 , and the neutral point potential ∆u mid (Δ u mid = | u d1 − u d2 |), can be represented as [3]

\frac{\mathrm{d}\Delta {u}_{\mathrm{mid}}}{\mathrm{d}t}=-\frac{1}{2C}\left[\left(1-\left|{\mathrm{S}}_{\mathrm{a}}\right|\right){i}_{\mathrm{a}}+\left(1-\left|{\mathrm{S}}_{\mathrm{b}}\right|\right){i}_{\mathrm{b}}+\left(1-\left|{\mathrm{S}}_{\mathrm{c}}\right|\right){i}_{\mathrm{c}}\right]

…”

Section: Mathematical Models Of the Npc Three‐level Grid‐connecting I...mentioning

confidence: 99%

“…Medium voltage high-power converters have advantages in environmental protection and energy savings for their small harmonic pollution, and the high efficiency in energy conversion [1][2][3][4]. Along with the increase of the device working voltage and operation power, switch losses become the main composition of the converters' losses.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Model Predictive Current Control for the Grid‐Connecting Three‐Level NPC Inverters Based on an Effective Harmonic Extraction Method Under a Low‐Switching Frequency

Hou

Tan

2022

IEEJ Transactions Elec Engng

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Current control of the grid-connecting inverters usually has an important influence on the control performance especially when the inverters operate at a low-switching frequency for it would result in a severe harmonic distortion in the output current components. To improve the current control performance, a novel model predictive current control (MPCC) strategy based on an effective harmonic extraction method was present for a high-power three-level NPC inverter in this paper. First, an effective amplitudes extraction method called generalized sliding discrete Fourier transform (GSDFT) was designed for the fundamental and low-order harmonic current components, and which would be taken as a part of the cost function for the MPCC besides the consideration of switch losses and neutral point potential balancing issues. Experimental results verify that this kind of novel control strategy not only has a characteristic similar with the selective harmonic elimination, also could realize a nice current control performance even the switching frequency is low than 500 Hz as well as a neutral point potential balancing.

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Section: Mathematical Models Of the Npc Three-level Grid-connecting I...mentioning

confidence: 99%

\frac{\mathrm{d}\Delta {u}_{\mathrm{mid}}}{\mathrm{d}t}=-\frac{1}{2C}\left[\left(1-\left|{\mathrm{S}}_{\mathrm{a}}\right|\right){i}_{\mathrm{a}}+\left(1-\left|{\mathrm{S}}_{\mathrm{b}}\right|\right){i}_{\mathrm{b}}+\left(1-\left|{\mathrm{S}}_{\mathrm{c}}\right|\right){i}_{\mathrm{c}}\right]

…”

Section: Mathematical Models Of the Npc Three‐level Grid‐connecting I...mentioning

confidence: 99%

See 1 more Smart Citation

Model Predictive Current Control for the Grid‐Connecting Three‐Level NPC Inverters Based on an Effective Harmonic Extraction Method Under a Low‐Switching Frequency

Hou

Tan

2022

IEEJ Transactions Elec Engng

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“…A Neutral point clamped three-phase inverter scheme is shown in Figure 1 (b). Each phase contains four IGBT switches and two clamping diodes (D1 and D2 for leg a), the midpoint of the two diodes is linked to the DC-link capacitors midpoint (O) [22].…”

Section: Operating Principle Of Three-level Npcimentioning

confidence: 99%

Two-level inverter and three-level neutral point diode clamped inverter for traction applications: a comparative analysis study

Abdelsalam

Esmaeel

Zaid

2021

IJPEDS

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<span>This paper presents an analytical comparison between two-level inverter and three-level neutral point diode clamped inverters for electric vehicle traction purposes. The main objective of the research is to declare the main differences in the performance of the two inverter schemes in terms of the switching and conduction losses over an entire domain of the modulation index and the phase angle distribution, steady-state operation, transient operation at a wide range of speed variation, and the total harmonic distortion THD% of the line voltage output waveform. It also declares the analysis of the three-level neutral point diode clamped inverter (NPCI) obstacle and the unbalance of the DC-link capacitor voltages. The introduced scheme presents an Induction Motor (IM) drive for electric vehicle (EV) applications. Considering the dynamic operation of the EV, the speed of the three-phase induction motor is controlled using a scalar V/Hz control for the full range of the IM power factor (PF). A comprehensive MATLAB/Simulink model for the proposed scheme is established.</span>

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“…The three-level inverter has advantages, such as having a value close to the sine wave output voltage that can reduce the withstanding voltage rating and switching loss of the device, etc. [1][2][3]. The three-level inverter has been widely used in power, metallurgy, mining, petrochemical, and other occasions [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Model-Based Design and Experimental Validation of Control System for a Three-Level Inverter

Zhang

2022

Electronics

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Considering the disadvantages of the traditional development pattern in an embedded control system for an inverter, that is, the single-process thinking and separation of software and hardware, a novel method, which is a model-based design, for developing a double closed-loop control system for the diode-clamped three-level inverter was proposed. System control models, including the PWM control algorithm model, the voltage control model, the neutral-point potential balancing model, and the frequency control model, were built with the MATLAB platform. The code-generation capacity and the operation effect were verified through a series of tests. The inverter with diode clamp and neutral-point potential control was developed. Codes were generated automatically and downloaded to the eZdsp28335 control chip. Experimental waveforms of the phase voltage, line voltage and current were analyzed under regulating the voltage and frequency. The experimental results demonstrate that the models and the generated codes are correct. Further studies have proven the feasibility of the system development model.

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A Simplified Common-Mode Voltage Suppression and Neutral-Point Potential Control for the NPC Three-Level Inverter

Cited by 15 publications

References 21 publications

Model Predictive Current Control for the Grid‐Connecting Three‐Level NPC Inverters Based on an Effective Harmonic Extraction Method Under a Low‐Switching Frequency

Model Predictive Current Control for the Grid‐Connecting Three‐Level NPC Inverters Based on an Effective Harmonic Extraction Method Under a Low‐Switching Frequency

Two-level inverter and three-level neutral point diode clamped inverter for traction applications: a comparative analysis study

Model-Based Design and Experimental Validation of Control System for a Three-Level Inverter

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