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The insertion of grid connected photovoltaic (PV) in the power systems have occurred mainly at low and medium voltage. Besides, due to solar irradiance variation, these converters have excess capacity that can be used to provide ancillary services to the main grid. Therefore, this work is focused on the analysis of how PV inverters can perform ancillary services, supporting the grid. Control strategies...
The main objective of a photovoltaic (PV) inverter is to inject the PV power into the ac-grid. Generally, due to variations in solar irradiance, inverters operate bellow their rated current. Therefore, this current margin can be used to ancillary services, such as harmonic current compensation. However, it is necessary to study the photovoltaic inverters voltage and current capability effects during...
Photovoltaic energy has gained prominence in the current context of energy generation. The fundamental element of a photovoltaic system connected to the electric grid is the electronic converter. In order to be marketed, electronic converters must be tested and certified in accordance with current standards. In the certification process, an equipment known as a solar array simulator (SAS) is used...
Nowadays, non-linear loads are one of the major issues regarding the system power quality. Additionally, the growing presence of distributed generation (DG) systems, which employs converters to connect power sources to the grid may also affect power quality due to its switching. To better utilize such converters, multifunctional operation is usually employed. In order to reduce the harmonics generated...
This paper presents an inverter control scheme, based on proportional-resonant controllers, where the inverter works in multifunctional operation. In this case, the reactive power and harmonic compensation of the load are ancillary services. A resonant control is implemented in stationary reference frame (αβ), where is not necessary the use of a phase-locked loop (PLL). The instantaneous power theory...
In photovoltaic standalone systems it is crucial to absorb most of the available energy. Thus, in order to extract the maximum power of a solar panel for a given set of climatic conditions, it is used maximum power point tracker (MPPT). The MPPT consists in a power converter which controls the solar panel voltage. In this context, this work compares the instantaneous and dynamic efficiency of three...
Single and three-phase photovoltaic inverters are responsible to extract the photovoltaic array power and inject it into the grid. Due to variations in solar irradiance, inverters have a current margin, which is not explored during the day. Thereby, many works have proposed multifunctional operation. This concept consists in aggregate to the inverter control strategy other functions, such as harmonics...
Photovoltaic (PV) systems have gained prominence in the current context of distributed generation systems. The fundamental element of a PV grid-connected systems is the power converter. Power converters must be tested and certified according to the international standards, before being commercialized. Therefore, a flexible equipment to test the converters is necessary. This paper presents the modeling...
The main objective of a photovoltaic (PV) inverter is inject the PV power into the grid. However, due to variations in solar irradiance, inverters have a current margin, which can be used in reactive power and harmonics compensation. This possibility, known as multifunctional operation, can be interesting in terms of power factor improvement and reduction of nonlinear loads impact at point of common...
Unbalanced voltage dips are common disturbances in power systems. Therefore, grid-connected photovoltaic systems need to be able to work during these disturbances. Conventional control strategies do not consider the negative sequence current control, which is an important limitation. In this context, this paper compares through simulations four strategies of negative sequence current control: Notch...
This work aims to design and assembly a characterization of solar panel using capacitive load. This device provides information that allows the user to increase the efficiency of power generation in photovoltaic systems. Detection of operation issues or abnormal conditions such as partial shading caused by dirt or objects can affect adversely the maximum power point. Simulation results were used to...
Power inverters are essential components of photovoltaic systems and are designed to process the rated power generated by solar plant. Due to variations in solar irradiance, inverters have a current margin, which can be used in reactive power and harmonics compensation. This possibility, known as multifunctional operation, can be interesting in terms of power factor improvement and voltage control...
The power generated by a solar panel is directly related to the level of solar irradiance on the panel. Thus a system capable of tracking the solar movement improves the efficiency in the generated power. This work presents a study of solar radiation levels and the construction of a sun tracking prototype in order to follow the movement of the sun during the day and increase the power generated by...
The photovoltaic systems are extremely dependents on the climatic conditions in which they are submitted. For to represent this influence, there are in the literature three models of the solar photovoltaic panel: the equivalent circuit, the mathematical model and the multi-physical model. This paper compares these models using a grid connected photovoltaic system. Simulations of grid disturbances,...
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