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This paper presents a novel modular multilevel DC/DC converter suitable for integrating the oif-shore wind farm with the HVDC transmission system. The proposed converter consists of a wind farm-side three-phase MMC inverter and a series-connected rectifier linked by a special decoupled medium frequency transformer. The transformer decouples the three-phase input voltage into three isolated single-phase...
This paper presents the design and analysis of a Modular Multilevel Matrix Converter (M3C) working as a frequency changer to facilitate the deployment of offshore Low Frequency AC (LFAC) transmission system. The converter consists of nine branches, each with n cascaded H-bridge submodules connected in series with the arm inductor. The paper proposes a new energy balance control method, which manages...
Multi-output converters are widely used in various electronic devices and Electric Vehicles (EVs) due to their benefit in terms of cost, efficiency and space for installation. On the other hand, Wireless Power Transfer (WPT) methods including Inductive Power Transfer (IPT) and Capacitive Power Transfer (CPT) have been applied increasingly in EVs since they are more convenient and safe as compared...
Different schemes of modified conventional sorting algorithms with low complexity are proposed in order to balance the voltages of submodule (SM) capacitors for the modular multilevel converter (MMC). Two different procedures are investigated in this study. The main idea is to achieve voltage balance within the MMC arms with fewer current sensors. The two different methods are examined under different...
Phase angle, frequency and amplitude of the utility voltage are a critical piece of information for the operation of the grid-connected inverters. In such applications, an accurate and fast tracking of this information is essential to ensure the correct operation of the control system. This paper presents a novel phase-locked-loop (PLL) algorithm suitable for single-phase grid connected systems. The...
Synchronous dq-frame controllers are generally accepted due to their high performance compared to stationary αβ-frame ones, as they operate on dc quantities, achieving zero steady-state error. In single-phase systems, however, PI-based dq controllers cannot be directly applied due to the reduced number of input signals available compared to three-phase systems. The common approach in single-phase...
This paper presents a new high voltage high power DC/DC converter suitable for off-shore windfarm application. The proposed converter functions as a DC collection point and boosts the wind generators' voltages to facilitate the employment of high voltage direct current (HVDC) transmission lines. The proposed converter utilizes the modular multilevel converter (MMC) structure and combined converter...
The paper investigates the STATCOM system based on five-level cascaded inverter controlled using carrier-based pulse width modulation (CB-PWM) technique. In this work, the STATCOM is controlled to provide only the reactive power compensation at the point of common coupling (PCC) when an RL load is connected to the power system at different lagging power factors. The rotating switching scheme is employed...
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