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As the penetration level of grid-connected PV systems increases, more advanced control functionality is demanded. In order to ensure smooth and friendly grid integration as well as enable more PV installations, the power generated by PV systems needs to be flexible and capable of: 1) limiting the maximum feed-in power, 2) ensuring a smooth change rate, and 3) providing a power reserve. Besides, such...
This paper proposes the design of maximum power point tracking based on fuzzy logic control for standalone PV system. A complete model of the fuzzy logic maximum power point tracking for standalone PV system is compiled and loaded on the eMEGAsim using the RT-Lab real-time simulation platform from Opal-RT. The effectiveness of the proposed fuzzy logic control has been compared with the perturbation...
As the penetration level of grid-connected Photovoltaic (PV) systems increases, the power quality is one of the major concerns for system operators and the demands are becoming even stricter. The impact of interharmonics on the grid has been acknowledged in recent research when considering a large-scale adoption of PV inverters. However, the origins of interharmonics remain unclear. Thus, this paper...
In this paper, a current sensorless maximum power point tracking (MPPT) algorithm for a low-cost PV array controller is proposed. In order to reduce the cost on controllers and sensors, the PV array controller is based on controlling turn-on time of the interleaved flyback converter and DC bus output is designed. The controller only samples the input voltage without the need for a current sensor,...
In this paper, a novel hybrid maximum power point tracking (MPPT) method under partially shaded conditions (PSC) is proposed. The duty cycle of the dc-dc converter is controlled from small to large with fixed intervals in order to scan the P-V characteristics curve under partially shaded conditions, and then find out the maximum power value, which is called duty sweep (DS) algorithm in this thesis...
A novel algorithm for maximum power point tracking (MPPT) in solar power-generating systems was proposed and compared with the conventional methods of hill climbing, perturbation and observation, and incremental conductance. The three conventional algorithms are prone to divergence under low irradiance levels (<150W/m2), resulting in MPPT difficulties. This study proposed a new MPPT technique based...
In microgrids, photovoltaic (PV) and storage are integrated as a droop-controlled ideal source, which is not practical and challenges the system efficiency. Instead, PV-storage can be allocated separately. This PV-storage independent system is more flexible and easier to optimize. But, the conventional PQ-controlled PVs rely on master voltage-controlled storage sources. In this paper, a novel operation...
This paper presents present a study and implementation of a three-level boost converter. This converter feature includes low devices voltages stress requirement for high voltage application, small inductor size that leads to the reduction of cost and size and can be operated with a wide range input voltage. Unlike conventional method, output capacitor voltage balancing was done by a slight phase shift...
In this paper, an 1.2 kW thermoelectric generation system (TEG) for industrial waste heat energy recovery is developed and implemented. To achieve better performance, a novel hybrid maximum power point tracking (MPPT) method is also proposed. Comparing with conventional perturb and observe (P&O) technique and variable-step P&O method, the presented MPPT method can improve the tracking speed...
When photovoltaic panels are non-uniformly irradiated, they experience shadowing effect and the power against voltage curve will demonstrate multiple peaks which cause maximum power point tracking method to become challenging. A method often used to track the real peak is the two stage searching method which uses a ratio of the open circuit voltage. However, this method has some shortcomings especially...
This work presents a novel photovoltaic (PV) system with an intelligent maximum power point tracking (MPPT) controller. This Intelligent PV system consists of a solar model, flyback converter, digital signal processor, and DC electronic load. The MPPT controller based on the interval type-2 fuzzy logic control (type-2 FLC) can achieve fast tracking of the maximum power point and prevents interference...
Maximum power point tracking (MPPT) has been widely studied since it is closely related to the efficiency of wind harvesting. Generally, there are two major approaches to realize MPPT. One is to reach the optimal power point by perturbing and observing the extracted wind power; the other is to reach the optimal power output by tracing the turbine power curve. Each approach has its pros and cons and...
For high PV penetration, grid ancillary services such as dynamic voltage support and low-voltage ride-through (LVRT) operation are recommended by network operators. This paper proposes an integrated controller for LVRT capability of a three-phase grid-tied PV system connected to a LV grid. Generally X/R ratio is low for LV grids, therefore the active power injection is given higher priority than the...
To improve reliability of micro-grid system without energy storage, a maximum power point tracking (MPPT) algorithm considered spinning reserve capacity was proposed. Using implicit curve fitting method, the algorithm set aside 10% of PV array's maximum output power as spinning reserve of distributed generation (DG), and tracked maximum power point of load in real simultaneously. Moreover, to improve...
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