Abstract
This paper presents a method to improve the quality of input-output currents in a three-level neutral-point clamped (NPC) inverter with small direct current-link (DC-link) capacitor systems. The inverter systems with the small DC-link capacitors have several advantages in terms of cost, volume, life-time, and reliability when compared to inverters that use large DC-link capacitors. However, there are problems with respect to the deterioration of the input current quality and a severe ripple of neutral-point voltage (NPV), which can cause an aggravated output current. To mitigate these issues, an additional circuit is applied for the input current shaping and a compensation algorithm is applied to reduce the ripple voltage of NPV. The effectiveness of the proposed design and control method is verified with various simulation and experimental results.
Highlights
Three-level neutral-point clamped (NPC) inverters have been widely used in medium-voltage power conversion systems
Controls are low not performed, Vcon has the same magnitude as Vdc-link capacitor voltage in the direct current-link (DC-link) and the output current
To reduce the capacitance and volume of the capacitors, the electrolytic capacitors replaced by film capacitors
Summary
Three-level neutral-point clamped (NPC) inverters have been widely used in medium-voltage power conversion systems. The DC-link of an NPC inverter is mainly composed of an electrolytic capacitor with a large capacitance. By increasing the demand in terms of small current distortion, low dv/dt and high efficiency, efficiency, the three-level inverter is widely applied in various applications. A large unbalance causes the output currents to contain the ripple frequency, which causes. AC unbalance causes the output currents to contain the ripple frequency, which causes the distortion. An applied input–output currents generated by the three-level NPC inverter based small DC-link system. Circuit solves the input current deterioration caused by the small applied DC-link shunt compensator (DSC) circuit solves the input current deterioration caused by DC-link addition, In theaddition, output current qualitycurrent is improved using the AC ripple-reduction the smallcapacitor.
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