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A novel distributed adaptive droop coordination control system has been proposed in this paper to solve the economical dispatch problem (EDP) in DC microgrids. It comprises of tertiary and secondary controllers for scheduling the dispatchable distributed generation (DGs) output powers to ensure optimal load sharing between them and restore microgrid's average voltage as well. The controller of each...
This paper develops a new fully distributed coordination control scheme for optimally reducing the total generation cost (TGC) in DC microgrids that includes different types of dispatchable distributed generations (DGs). It presents the normalized running cost as a comprehensive economical dispatching problem (EDP) solving method to overcome the drawbacks of the conventional EDP solving techniques...
in this paper, a test methodology is proposed to study and analyze the factors that affect Photovoltaic system's performance involving dust accumulation and tilt angle. Literature has shown that a number of studies have studied the effect of dust accumulation on the PV modules performance. However, the relationship between the dust accumulation and tilt angle in real time study is not cleared yet...
Differential mode Three-phase Micro inverter DTMI has many features in low voltage application such as module integrated PV architectures. It has the ability to increase the PV module voltage using single stage with low components count. Differential inverter is implemented using three DC-DC converters with their input terminals connected in parallel and their outputs terminals connected differentially...
This paper proposes a fully distributed coordination control in islanded DC microgrids in order to minimize the generation cost. It consists of tertiary and secondary control levels to optimize load sharing between distributed generations (DGs). A normalized running cost is proposed as a comprehensive method for solving economic dispatch problem (EDP) of DC microgrids. Through dynamic consensus protocol,...
In this paper, a single-phase self-synchronized inverter with current limiting capability without a dedicated synchronization unit is presented. It offers an approach for power systems to control distributed renewable energy sources. The proposed system has the capability to synchronize itself with the utility grid before connection and track the grid frequency after connection without a phase-locked...
this paper presents Model Predictive Control (MPC) to tie three-phase quasi Z-Source Inverter (qZSI) to the utility grid. Regularly, to control the capacitor voltage in qZSI based on MPC, the inductor current is the key factor. Here, the proposed algorithm has the features of decreasing the number of sensors where the inductor current sensor is removed to improve the cost and foot print of the control...
In this paper, a novel three phase modular multi-level inverter (MMLI) is proposed. The proposed inverter consists of primary cell and repetitive modular cells which are connected in series arrangement with the primary cell. Therefore, the proposed topology is able to get more output voltages levels number by adding extra modular cells. Both the sinusoidal pulse width modulation (SPWM) and staircases...
The ANPC (Active Neutral Point Clamped) topology was initially proposed to overcome the unequal loss distribution among the NPC (Neutral Point Clamped) converter power devices. This goal depends deeply on the PWM strategy that is controlling the converter. In this paper, the thermal behavior of the ANPC converter is firstly analyzed. The actual issue is the unequal junction device temperature distribution...
This paper proposes a new design and implementation of a single stage three-phase multi-level inverter (MLI). The suggested inverter is modular type and can be generalized by connecting the basic modular cells in series configuration. In addition, it can be operated with symmetrical/asymmetrical Dc-voltage sources. The proposed MLI is successfully modulated using sinusoidal pulse width modulation...
This paper presents a distributed control for dc microgrids that minimize the total generation cost and regulate the average voltage at the desired value. The proposed controller includes two modules; lower cost regulator and voltage regulator. In addition, a sparse communication network with a balanced laplacian matrix is used for data exchange between converters as each converter communicates only...
Recently, Model Predictive Controller (MPC) becomes the most attractive control in power electronics and drives applications. It is incorporated in Z-Source Inverter family (ZSI) where each of capacitor voltage, inductor current and output load currents could be controlled at their setting points' values. In this paper, a proposed algorithm for qSZI is introduced to simplify the system through reducing...
In this paper, a single-phase self-synchronized inverter that mimics synchronous generators (Synchronverter) without a dedicated synchronization unit is investigated. It offers a mechanism for power systems to control distributed renewable energy sources. It can synchronize itself with the grid before connection and track the grid frequency very well after connection without a phase-locked loop (PLL)...
This paper presents an improvement algorithm of Model Predictive Control (MPC) for the quasi Z-Source Inverter (qZSI) with a standalone system. The improved algorithm decreases number of the desired sensors from five into three, where it just needs two current sensors for measuring the AC currents, and another voltage sensor for capacitor voltage detection. The inductor current will be estimated according...
This paper presents a novel three-phase Multi-Level Inverter (MLI). The proposed inverter operates with symmetrical DC power sources and low frequency modulation technique as well. The main contribution of the proposed topology is the total number of the active power switches used to generate the same number of levels compared to the previous topology is reduced by 25 %. Therefore, it is expected...
This paper presents a distributed cooperative control that ensures reliable operation of DC Microgrid with lower generation cost without centralized controller. Centralized hierarchical multilevel controller is the commonly used controller in Microgrids, however it requires heavy communication network and present single point of failure. Therefore, the proposed controller is a distributed cooperative...
this paper proposes a good approach to mitigate the problematic issues related to Global Maximum Power Point Tracking (GMPPT). This approach can accurately track the true maximum power under different irradiation conditions using simple adaptive controller. This adaptive controller enables the maximum efficiency operation of the photovoltaic module avoiding any local maxima operation problems. Moreover,...
Up till now, a lot of work is done to improve the features of Z-Source Inverter (ZSI) as a single stage inverter through the modification in the construction of the basic topology. A modified two switched inductor quasi Z-source inverter (MTSL-qZSI) topology is proposed in this paper. The principle of the proposed topology depends on using the bootstrap capacitor instead of the center diode in one...
This paper presents a new trend in the transportation industry to adopt the multilevel inverter-based propulsion systems and gives the design procedure of a new dc/ac 3-phase 7-level inverter for powering rail metro cars. The novelty of the proposed inverter lies within the proposed control methodology, which uses a new switching pattern that guarantees a modified space vector pulse with modulation...
Model Predictive Control (MPC) becomes more prevalent in power converters due to its faster response in tracking the reference values of the controlled variables. In this paper, the MPC is applied on the Switched-Inductor quasi Z-Source Inverter (SL-qZSI) topology. The MPC modeling for the capacitor voltage, inductor current, and output load current of the topology are designed to predict their values...
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