Voltage source converter based multi – terminal DC grids (VSC MTDC) are widely used for integration of renewable resources. Control these requires vector control method, which includes inner and outer current controllers, tuning controllers is very important. Conventionally methods consider approximated linear model to tune the proportional integral (PI) parameters voltage (VSC) fails produce o...

The voltage source converter based high direct current (VSC-HVDC) system is on converter, and its control more complex. Also affected by the fast of power electronics, oscillation phenomenon in wide frequency domain may occur. To address problem small signal stability VSC-HVDC system, a strategy designed to improve stability, risk reduced attaching damping controller optimizing parameters. Base...

To transfer large amount of direct current power having high amplitude voltage over long distance, high voltage direct current (HVDC) transmission system is used. This system was introduced 60 year ago and now it is widely used all over the world. Some examples of HVDC systems are following; Voltage-SourcedConverter (VSC), current commutated converter (CCC) and line commutated converter (LCC) d...

Low-frequency oscillations have been reported in several weak-grids-connected voltage-source-converter(VSC) systems. Although efforts devoted to understanding the parametric and sensitivity impact of VSC controller gains, a general formulation oscillation mechanism is still missing. Using transfer function dynamic modelling approach, we find that outer loop active power control's bandwidth main...

This paper includes modeling and simulation of 180 MW units of pumped storage power plant with Variable speed machines. In this method, voltage source inverters are used instead of traditional cyclo-converters. This paper aims to control the voltage source inverters and maintain DC voltage at a constant value. AC/ DC/ AC converter is used in system configuration structure in order to control an...

For the integration of distributed generation (DG) units to the utility grid, voltage source converter (VSC) is the key technology. In order to realize high quality power injection, different control techniques have been adopted. However, the converter-based DG interface is subject to inevitable uncertainties, which adversely influence the performance of the controller. The interfacing impedanc...

Compared to conventional DC transmission, Voltage source converter based high voltage direct current transmission (VSC-HVDC) has the advantages of independently controllable power, no commutation failure, reactive power compensation and low harmonic levels. However, VSC-HVDC cannot provide effective frequency support regulation for system after grid connection. For this reason, an adaptive neur...

In order to solve the problem that voltage source converter based multi-terminal direct current (VSC-MTDC) system cannot provide inertia and participate in frequency modulation after connecting AC power grid under traditional control strategy, an adaptive strategy on virtual is proposed. First, relationship between DC was established by a control, allowing VSC-MTDC side. Second, address limited...

This paper presents a hybrid active power filter for a three phase four wire distribution system. The scheme consists of a zigzag transformer, single phase active power filter connected in series with the utility neutral and a coupling capacitor connected in series with a voltage source converter of the active power filter (APF). The addition of coupling capacitor permits the reduction in DC li...