This paper suggests a new control method to modify the virtual impedance performance in unbalanced conditions. The proposed method compensates the voltage drop that occurred due to the virtual impedance and adjusts the voltage of the point of common coupling at a desirable level. To compensate the voltage drop, the reference voltage in the droop control varies according to the proposed algorith...

microgrids are small-scale, low voltage (lv) power networks which employ renewable distribution energy resources (ders) with power electronic interfaces (peis). microgrids as single controlled units and active distribution networks require flexible control systems to ensure reliable and secure operation in different modes. these various operations of microgrid cause variations in voltage and fr...

This paper presents a multiobjective daily voltage and reactive power control (Volt/VAr) in radial distribution systems, including distributed generation units. The main purpose is to determine optimum dispatch schedules for onload tap changer (OLTC) settings at substations, substation-switched capacitors, and feeder-switched capacitors based on the day-ahead load forecast. The objectives are s...

This paper proposes a novel single-input sampling instance control circuit used in primary-side controller of Switch Mode Power Supplies (SMPS) without optical-coupler and secondary feedback control circuit. The novel control circuit is based on the idea determining the sampling instance of current switching cycle by the duration of the voltage pulse at the auxiliary wingding during the previou...

In this study, a novel variable impedance control for a lower-limb rehabilitation robotic system using voltage control strategy is presented. The majority of existing control approaches are based on control torque strategy, which require the knowledge of robot dynamics as well as dynamic of patients. This requires the controller to overcome complex problems such as uncertainties and nonlinearit...

The newly developed 10 mA, 50 keV heavy ion injector T-5010 is intended for use in isotope separators, ion implanters as well as autonomously for researches in the physics and technology of ion sources. It is complete with power supply, control, vacuum and cooling system. The injector layout is shown in Figure 1. The Freeman type ion source with four-electrode accel/decel system is set on the v...

Abstract To improve the efficiency of wireless power transfer (WPT) systems, this paper proposes a bilateral perturbation and observation method for WPT systems based on resonant modular three-level topology. This uses duty cycle rectifier to control output voltage, optimizes reactive in primary secondary sides by disturbing phase difference between input voltage current rectifier, achieves imp...

The power converter that feeds high-frequency, highvoltage transformers must be carefully designed due to parasitic components, mainly the secondary winding capacitance and the leakage inductance, that introduces resonances in relatively lowfrequency range, next to the switching frequency. This paper considers applications in which the load (resistive) has an unpredictable behavior, changing fr...

Improving transient voltage stability is one of the most important issues that must be provided by doubly fed induction generator (DFIG)-based wind farms (WFs) according to the grid code requirement. This paper proposes adjusted DC-link chopper based passive voltage compensator and modified transient voltage controller (MTVC) based active voltage compensator for improving transient voltage stab...

This paper presents a single-objective model predictive control for bidirectional DC-DC flying capacitor (FC) converter, which integrates battery to the microgrid. The presence of multiple FCs facilitates converter interface low-voltage high-voltage DC bus at reduced voltage stress on its power switches. However, such requires controller that fulfils objectives, namely and FC regulations, flow....