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The modular structure and the many other advantages of the Modular Multilevel Converter makes it an attractive converter for Battery Energy Storage Systems, allowing the battery units to be distributed throughout the convert, connected in each submodule. However, such an arrangement results in large oscillating components in the battery current, which is harmful to battery performance and lifetime...
This research presents a Maximum Power Point Tracking (MPPT) algorithm for a solar photovoltaic (PV) power station which is constructed based on modified circuit topology of the Modular Multilevel Converter (MMC). The proposed MPPT is featured with Optimized Finite-Control-Set Model Predictive Control (FCS-MPC) to provide continuous extraction of maximum solar energy. The estimation-based approach...
This paper demonstrates a comparative study of two well-known Maximum Power Point Tracking (MPPT) algorithms in photovoltaic (PV) plants based on Modular Multilevel Converter (MMC). The Perturb and Observe (P&O) technique which is widely deployed throughout industry is considered for the comparison evaluation together with the Ripple Correlation Control (RCC) strategy. The efficiency of entire...
In power converters, common challenge for current reference tracking employing model predictive control (MPC) is the high computational burden. This issue is more obvious when solving optimal control problems over prediction horizons. To manage and enhance the computational efficiency of widely used control strategies, an integrated perturbation analysis and sequential quadratic programming (IPA-SQP)...
This paper investigates a Finite-Control-Set Model Predictive Control (FCS-MPC) for the precise control of (un)balanced load currents in Modular Multilevel Converter (MMC). The control objectives are circulating currents minimization inside the converter arms, achieve a capacitors voltage balance and load current control. To achieve the converter constrained optimization and facilitate the implementation...
Contrary to intuition, solar irradiance peaks at partially cloudy conditions. Clouds can boost sunlight by over 1.5 times, even at high latitudes. Depending on cloud velocity, the bursts last from seconds to minutes. Measuring irradiance on a tilted surface with 10-ms resolution allows for a detailed study of such events in Southern Norway, almost at sea level. All monthly maxima from April through...
DC power system in ship applications is an emerging technology, which provides new opportunities for reducing fuel consumption and emission. However, the resulted power electronic-based system onboard the ship requires effective analysis tools to facilitate a full-realization of the advantages. This paper reviews the modelling of hybrid electric ship components including mechanical and electrical...
DC distribution systems are emerging in ship applications in order to facilitate fuel saving and low emission. As opposed to the conventional shipboard ac power systems, in a ship dc power system, the generators can rotate independently. This makes the voltage regulation and power sharing to be implemented differently. This paper presents dc voltage control in a shipboard dc power system, while the...
Contrary to intuition, solar irradiance peaks at partially cloudy conditions. Clouds can boost sunlight by over 1.5 times, even at high latitudes. Depending on cloud velocity, the bursts last from seconds to minutes. Measuring irradiance on a tilted surface with 10-ms resolution allows for a detailed study of such events in Southern Norway, almost at sea level. All monthly maxima from April through...
Different modeling approaches for an isolated bidirectional dc-dc converter are investigated to be used in analysis and simulation of a hybrid electric ship. The models are verified by comparison with simulation results of detailed switching model in PLECS software. The advantages and disadvantages of different modeling methods are discussed. A unified model for both buck and boost modes is proposed...
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