Abstract
The unbalance of the neutral point voltage is an inherent problem of three-level neutral-point-clamped (NPC) Active Power Filter (APF); this paper analyzes the causes of unbalanced neutral point voltage and studies the reason of the unbalance of the neutral point voltage. A novel neutral point voltage control strategy using Space Vector Pulse Width Modulation (SVPWM) is proposed. The proposed strategy is based on the traditional SVPWM, by controlling the effect time of small vector, which can change the state of the midpoint voltage fluctuation, and the neutral point voltage can be maintained balance. The influence of the vector on neutral point balance is investigated in depth. Simulation results show the neutral point voltage balancing control strategy based on SPWM is effective.
Highlights
There is growing demand for less harmonics and higher voltage level in medium-voltage and high-voltage applications, such as industrial drive, traction and power system
The NPC three-level Active Power Filter (APF) has an inherent problem of the neutral point voltage balance
This paper presents a novel neutral point voltage balance control strategy based on regulating factor
Summary
There is growing demand for less harmonics and higher voltage level in medium-voltage and high-voltage applications, such as industrial drive, traction and power system. The NPC three-level APF has an inherent problem of the neutral point voltage balance. It will increase the output voltage harmonics; damage the switching devices and dc-link capacitors. Each small vector has two redundant states: positive small vector and negative small vector These two states generate the same output voltage vector; they have the opposite control effect on the neutral point voltage. Simulation and experimental results show that the strategy has good capability for neutral point voltage balance
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