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Due to the three-phase-to-three-leg direct matrix converter (3 × 3 MC) cannot be achieved with unbalanced load, then the three-phase-to-four-leg direct matrix converter (3 × 4 MC) is introduced. A novel modulation strategy is proposed to ensure the capability of 3 × 4 MC with arbitrary loads, which is development by using fixed voltage vectors and one zero vector. Considering the harm of common-mode...
Computer planning and simulation of power systems requires system components to be represented mathematically. A method for building a dynamic phasor model of an Interline Dynamic Voltage Restorer (IDVR) is presented, and the resulting model is tested in a simple radial distribution system. Mathematical analysis is carried out for each individual component of the IDVR as modular models, which are...
Hexverter is a recently proposed direct AC/AC modular multilevel converter (MMC). It features significant advantages for low-frequency drives compared to traditional MMC in back-to-back configuration. This paper presents a novel branch energy control method based on the injection of optimized circulating current and neutral-point voltage. It can effectively balance the energy stored in the six branches...
This paper investigates the control and operation of doubly-fed induction generator (DFIG) and fixed-speed induction generator (FSIG) based wind farms under unbalanced grid conditions. A DFIG system model suitable for analyzing unbalanced operation is developed, and used to assess the impact of an unbalanced supply on DFIG and FSIG operation. Unbalanced voltage at DFIG and FSIG terminals can cause...
This paper presented a novel maximum power point tracking (MPPT) algorithm for switched reluctance generator (SRG) based wind generation system (WGS). The fundamental principle of the MPPT algorithm is based on monitoring the SRG's output power and shaft speed to adjust the excitation phase current of SRG. The advantages of the proposed MPPT algorithm are that no knowledge of the wind turbine characteristics...
This paper investigates the modeling and control of doubly fed induction generator (DFIG) and fixed speed induction generator (FSIG) based wind farms under unbalanced conditions. A DFIG model suitable for analyzing unbalanced operation is developed, and used to assess the impact of an unbalanced supply on DFIG and FSIG operation are illustrated. Network voltage unbalance can cause unequal heating...
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