This paper develops a flexible power regulation and limitation strategy of voltage source inverters (VSIs) under unbalanced grid faults. When the classical theory is used faults, oscillations current distortions are inevitable. In proposed strategy, extended introduced to compute feedbacks together with theory. Based on combination theory, can achieve sinusoidal provision between three common t...

Abstract A new inter-cluster DC capacitor voltage balancing scheme for a delta connected modular multilevel cascaded converter (MMCC)-based static synchronous compensator (STATCOM) is presented. detailed power flow analysis of applying negative sequence current (NSC) and zero-sequence (ZSC) injection methods in addressing the issue imbalance under unbalance grid carried out. control proposed wh...

The grid voltage modulated direct power control (GVM-DPC) is a novel regulation method for grid-connected source inverters (VSI). However, interactions between real and reactive powers still exist in GVM-DPC under unbalanced condition, which may deteriorate its transient performance. This article proposes decoupling GVM-DPC-based VSI systems based on the dynamic feedforward compensation strateg...

The growing relevance of voltage source converters (VSCs), and the deep impact they have on development maintenance electrical grid, increase necessity further research how to deal with nonideal grid conditions from VSCs control. This paper is aimed summarize basic techniques schemes that might be required for a grid-connected VSC work under these conditions: synchronization schemes, sequence d...

The operational stability of grid-connected converters is affected by unbalanced grid voltage, which often leads to overcurrent. traditional control method maintains the grid-into current within rated limit adjusting reference value. However, this limits output active power and affects their reliability, can cause shortage or even disconnection grid. To deal with issue, paper proposes an effect...

This review article is mainly oriented to the control and applications of modular multilevel converters (MMC). The main topologies of the switching modules are presented, for normal operation and for the elimination of DC faults. Methods to keep the capacitor voltage balanced are included. The voltage and current modulators, that are the most internal loops of control, are detailed. Voltage con...

This paper develops an effective control framework for DC voltage control and power-sharing of multi-terminal DC (MTDC) grids based on an optimal power flow (OPF) procedure and the voltage-droop control. In the proposed approach, an OPF algorithm is executed at the secondary level to find optimal reference of DC voltages and active powers of all voltage-regulating converters. Then, the voltage ...

Power-electronic interfacing based devices such as wind generators (WGs) and electrical vehicles (EVs) cause harmonic distortions on the power grid. Higher penetration and uncoordinated operation of WGs and EVs can lead to voltage and current harmonic distortions, which may exceed IEEE limits. It is interesting to note that WGs and EVs have some common harmonic profiles. Therefore, when EVs are...

The expected increase in the penetration of electric vehicles (EV) and plug-in hybrid electric vehicles (PHEV) will produce unbalanced conditions, reactive power consumption and current harmonics drawn by the battery charging equipment, causing a great impact on the power quality of the future smart grid. A single-phase semi-fast electric vehicle battery charger is proposed in this paper. This ...