Neutral-Point Potential Balancing Control Strategy for Three-Level ANPC Converter Using SHEPWM Scheme

Zhang, Yunlei; Hu, Cungang; Wang, Qunjing; Zhou, Yufei; Sun, Yue

doi:10.3390/en12224328

Cited by 8 publications

(4 citation statements)

References 23 publications

(32 reference statements)

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“…The total A-phase loss of the four modulation methods is calculated. The power device module loss imbalance of the four modulation methods is calculated and compared according to Formula (7).…”

Section: Simulation Results and Analysismentioning

confidence: 99%

Three-level ANPC rectifier loss calculation and balance control method

Zhou

2023

J. Phys.: Conf. Ser.

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Traditional three-level neutral-point clamped converter has the problem of the uneven loss distribution, which restricts the increase of converter capacity. Three-level active neutral-point clamped (3L-ANPC) converter can reduce the imbalance of power device loss distribution. At present, three traditional SPWM modulation strategies are used in single-phase three-level ANPC modulation. Considering the loss distribution, it is generally required to input the current and voltage sampling values in real-time and calculate the temperature of the switching device online for control or collect the temperature of the switching device in real-time for feedback control, which is more complicated to realize. This paper proposes a modulation scheme based on two carrier cycles, combined with traditional SPWM1 and 2, to analyze the switching conditions and loss characteristics of each switching device in this scheme. The simulation of a single-phase three-level ANPC rectifier was built, and the experiment was carried out on the Yuankuan HIL semi-physical platform. The results show that this scheme is simple, easy to implement, and can effectively reduce the loss distribution imbalance.

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Section: Simulation Results and Analysismentioning

confidence: 99%

Three-level ANPC rectifier loss calculation and balance control method

Zhou

2023

J. Phys.: Conf. Ser.

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“…Figure 4 shows a typical voltage waveform with quarter-wave symmetry in a threelevel converter that uses programmed PWM [22][23][24]. The programmed waveform is attained by switching the semiconductor modules at the right time at the switching angles α 1 , α 2 , .…”

Section: Programmed Pulse-width Modulation (Pwm)mentioning

confidence: 99%

Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

et al. 2021

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The existing publications on the analysis of power quality indicators in modern electric power supply systems are void of a comprehensive approach to improving these indicators in power systems by implementing multipulse connections. To the authors’ knowledge, this paper is the first to analyze current harmonic distortions in an 18-pulse connection of three-level active front-ends (AFE) featuring a programmed PWM. Raw data were obtained from, and current quality was analyzed for the power circuit of the main electric drive actuating the rolls in the rolling stand of a plate mill. The key feature of such circuitry is that the synchronous motor of each work roll is connected to the grid with an 18-pulse connection that uses three phase-shift transformers, where the phase shifts are 0° (delta/delta), 20° (delta/polygon) and −20° (delta/polygon). The circuitry connects three frequency converters (FC) with the AFEs in parallel. Phase-shift transformers were found to periodically overheat in the process. When overheating occurred, a programmed PWM voltage waveform was applied where harmonics 17 and 19 were eliminated. The goal and objectives were to analyze why the transformer would overheat and to find out how the issue could be addressed. The authors developed a simulation model of the research object in order to assess power quality parameters. Simulation results obtained in Matlab/Simulink were used to estimate the total harmonic distortions (THD) and individual harmonic factors for up to the 50th secondary transformer winding and grid harmonic with four different programmed AFE PWM voltage waveforms. The results helped find the best such waveform to prevent phase-shift transformers from overheating; one with harmonics 5, 7, 17 and 19 eliminated. The experimental and mathematical modeling results in the paper were confirmed by positive effects after industrial implementation of the system. Research performed directly on the operating equipment has been classified by the company and is not publicly available. These results are highly versatile and could be used in similar research on other circuitries to ensure the electromagnetic compatibility of nonlinear power-consuming devices.

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“…When i E = 0 or the ESS is disconnected from the inverter, it may be desirable to keep the inverter in operation and thus a mechanism to balance the DC bus voltages is required. For three-phase inverters, redundant switching states are available to synthesize a determined line voltage and, since they cause opposite impact on the DC bus voltages, these states are usually used to balance the neutral point [25][26][27][28]. Single-phase NPC/ANPC full-bridge inverters also have these redundant switching states.…”

Section: Neutral Point Balancingmentioning

confidence: 99%

Control System Development for the Three-Ports ANPC Converter

et al. 2020

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This paper proposes a control system for the single-phase Three-Ports Active Neutral- Point-Clamped (ANPC-3P) converter, which can inject a sinusoidal current into the grid, balance the neutral point voltage, and regulate the energy storage system (ESS) current with reduced low-frequency ripple. Despite other applications, ANPC-3P inverter can be used in grid-tied renewable generation to allow the simultaneous connection of a photovoltaic (PV) energy source and an ESS to the AC grid. The ESS is connected directly to the inverter circuit without any auxiliary DC-DC converter, but due to the DC bus pulsed power, it can be subjected to low-frequency current ripple. This undesired current ripple is difficult to filter and can lead to shorter battery life. A control system based on well-known controllers is analyzed and designed. Theoretical analysis is validated experimentally using a single-phase 1-kW prototype.

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Neutral-Point Potential Balancing Control Strategy for Three-Level ANPC Converter Using SHEPWM Scheme

Cited by 8 publications

References 23 publications

Three-level ANPC rectifier loss calculation and balance control method

Three-level ANPC rectifier loss calculation and balance control method

Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

Control System Development for the Three-Ports ANPC Converter

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