Abstract: Active Power Filter (APF) is capable of changing the size and frequency of harmonics as well as changes in reactive power compensation. It is important to control the stability of the DC-link capacitor voltage stability for it. For DC voltage controls of APF, there are two important achievements. First, it is indicated that the control of DC voltage directly affects the compensation p...

Selective harmonic elimination–pulsewidth modulation (SHE–PWM) is a technique widely used to improve the efficiency and content in medium-voltage high-power converters. Among these converters, three-level neutral-point-clamped (3L-NPC) converter one of most utilized topologies. However, 3L-NPC requires proper balancing dc-link capacitor voltages. This article presents control technique, based o...

A serious constraint in multilevel inverters is the capacitor voltage-balancing problem. The unbalance of the different DC voltage sources of the five-level Neutral Point Clamping Voltage Source Inverter (NPC-VSI) constituted the major limitation for the use of this power converter. To remedy to this problem, a new control solution to compensate the unbalanced DC voltages for the five-level NPC...

This paper presents a control scheme of cascaded H-bridge STATCOM in three-phase power systems. Cascaded H-bridge STATCOM has merits in point of switching losses, output harmonics, and the number of circuit components. But every H-bridge cell has isolated dc capacitors. So the balancing problem of capacitor voltages exists. Since STATCOM is often requested to operate under asymmetrical conditio...

This paper presents the transient model of a new FACTS device, the center node unified power flow controller(C-UPFC), installed at the midpoint of a transmission line. The C-UPFC consists of three voltage source inverters (VSI) with common DC link. One of the converters is connected in parallel at the midpoint of line and the other two converters are connected in series. The simulation results ...

In this paper, a task-space controller for electrically driven robot manipulators is developed using a robust control algorithm. The controller is designed using voltage control strategy. Based on the nominal model of the robotic arm, the desired signals for motor currents are calculated and then the voltage control law is proposed based on the current errors and motor nominal electrical model....