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Bypass diodes are used in PV arrays to protect sunny modules against the negative effects of shaded ones. Bypass diodes characteristic mainly consist of two factors: turn on resistance and forward voltage. These factors could have affect on the output of solar photovoltaic array at shadow condition. This paper tries to analyze this effect by the use of two solar cells connected in series and protected...
With the aim of protect sunny modules against the negative effect of shaded ones, bypass diodes are used in solar array. There exist two major conventional configurations for bypass diodes: overlapped and no-overlapped. Alternatively, it seems that shadow reduces the output power of solar array and leads to reducing output current. The fact is, behavior of array under partial shading condition is...
A dc to ac inverter is used to change the input voltage to a desired alternative voltage which has sinusoidal waveform with controllable magnitude and frequency. This paper proposes a novel configuration for dc to ac inverter with only two switches which controlled by new method. In this technique, the gate pulse contains several states which each state based on an AC PWM method. This new configuration...
Temperature rising is a negative factor in almost all systems. It could cause by self heating or ambient temperature. In solar photovoltaic cells this temperature rising affects on the behavior of cells. In reality, it affects on components of equivalent circuit. This paper tries to analyze temperature effect using binary coding method and introduces a manner to reduce temperature negative effect...
Shadow which happens on photovoltaic arrays is a random phenomenon. To study the behavior of a PV array under different shading patterns, all possible types of shadow should be considered. In this paper binary coding method which can analyze all kind of possible shadows will be introduced. By using this method all possible kinds of shadow which maybe happens on a PV array could be analyzed. This method...
This paper propose a novel methodology to produce constant output voltage and frequency by using a switching mechanism that implement pulse width modulation to control a matrix converter with variable input voltage and frequency. In this scheme, for a full input cycle, input voltages are considered to have constant magnitudes. In this period, the voltage gain is computed and then modulation matrix...
The main objective of static power converters is to produce an AC output waveform from a DC power supply. The output voltage waveform is not exactly a sinusoidal wave. Some ways should be found to improve the output voltage waveform. This paper introduces a method to minimize the total harmonic distortion (THD) of output voltage waveform in multilevel inverters. Steps amplitude of output voltage wave...
This paper introduces a new modulation method that can be adopted to obtain various possible output voltages depending on the switching topology and the voltage inputs available. This method is used to obtain a sinusoidal voltage waveform with a frequency which is a multiple of the frequency of the sinusoidal input voltage. There are various applications that need a variable frequency input and a...
In this paper the proper switching of the bidirectional switches found by calculating the duty cycles using Venturini's method [3] in conjunction by employing Neural network presented. So the need for standard soft switching calculation could be eliminated And the time needed to find modulation matrix using Venturini's method eliminate. A new modulation matrix using generalizes regression neural network...
This paper investigates the vector control of a two-phase induction motor drives with using matrix converter topologies. The aim is to reach a set of switches that can produce two phases voltage and current in order to be used in an induction motor. Since it is important to have a desired frequency for motor operation then this task can be achieved using matrix converter. Solution presents a switching...
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