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Figure 6. Power and efficiency of WPVPT system with various distance between the transmitter and receiver coil

Figure 6 Power and efficiency of WPVPT system with various distance between the transmitter and receiver coil

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The WPVPT system proposes a system frequency of 50 Hz; therefore, a frequency matching that is formed on the transmitter coil should be taken into consideration. The capacitance of the capacitor, C, is coupled with the inductance of the transmitter, magnetic relay, and receiver coils, L. According to the following equation, the system frequency, f, the capacitance of the capacitor, C, and the inductance of the transmitter, magnetic relay, and receiver coil, L, are all related (1). Since the capacitance of the capacitor, C, is chosen first in this instance, the value of the inductance, L, may be calculated by utilizing (1). In this case, the PV module with its data sheet in Table 1 is modelled to produce 240 V of DC output voltage. The center taps of the transmitter coil and the half bridge circuit, respectively, are linked tc the positive and negative terminals of the PV module. The simulation results and the PV module data sheet verify the PV module's performance in terms of the current versus voltage curve and the power versus voltage curve. The validation is carried out at a solar irradiation of 1000 W/m? and a temperature of 25 °C and it is based on an error percentage, where the simulation result is legitimate if the error percentage is in the range of 10% [23].
The WPVPT system proposes a system frequency of 50 Hz; therefore, a frequency matching that is formed on the transmitter coil should be taken into consideration. The capacitance of the capacitor, C, is coupled with the inductance of the transmitter, magnetic relay, and receiver coils, L. According to the following equation, the system frequency, f, the capacitance of the capacitor, C, and the inductance of the transmitter, magnetic relay, and receiver coil, L, are all related (1). Since the capacitance of the capacitor, C, is chosen first in this instance, the value of the inductance, L, may be calculated by utilizing (1). In this case, the PV module with its data sheet in Table 1 is modelled to produce 240 V of DC output voltage. The center taps of the transmitter coil and the half bridge circuit, respectively, are linked tc the positive and negative terminals of the PV module. The simulation results and the PV module data sheet verify the PV module's performance in terms of the current versus voltage curve and the power versus voltage curve. The validation is carried out at a solar irradiation of 1000 W/m? and a temperature of 25 °C and it is based on an error percentage, where the simulation result is legitimate if the error percentage is in the range of 10% [23].
Figure 1. Overall proposed modelling of WPVPT system without a magnetic relay (a) proposed circuit and (b) MATLAB Simulink number of the transmitter coil, N,, the turn number of the receiver coil, N,., the radius of the transmitter coil, r;,, and the radius of the receiver coil, 7;., the mutual inductance, M,,, is given by (4). The mutual inductance value depends on and is inversely proportional to the distance between the transmitter and receiver coils since the values of turn number and radius of the transmitter and receiver coils are fixed.
Figure 1. Overall proposed modelling of WPVPT system without a magnetic relay (a) proposed circuit and (b) MATLAB Simulink number of the transmitter coil, N,, the turn number of the receiver coil, N,., the radius of the transmitter coil, r;,, and the radius of the receiver coil, 7;., the mutual inductance, M,,, is given by (4). The mutual inductance value depends on and is inversely proportional to the distance between the transmitter and receiver coils since the values of turn number and radius of the transmitter and receiver coils are fixed.
Figure 2. Overall proposed modelling of WPVPT system with a magnetic relay (a) proposed circuit and (b) MATLAB Simulink
Figure 2. Overall proposed modelling of WPVPT system with a magnetic relay (a) proposed circuit and (b) MATLAB Simulink
Figure 3. PV module voltage and power as function of solar irradiance and temperature (a) voltage and (b) power directly converts the voltage level of the PV module into the AC voltage level on the transmitter coil, and the PV module current flows via the transmitter coil and they have a proportional relationship. Additionally, it results from the fact that the electromagnetic field produced by the transmitter coil increases according to the amount of current flowing through it [26]. For the fixed distance between the transmitter and receiver coils of the WPVPT system, a higher electromagnetic field will result in a longer range of the electromagnetic field. As a result, a greater number of electromagnetic field flux will be captured by the receiver coil and it will produce a higher induced voltage, current, and power on the receiver coil. The solar irradiation of 1000 W/m? and a temperature of 25 °C provide the maximum PV module power of 1004 W, as indicated in Figure 3 (b), and the minimum PV module power of 736 W, as shown in Figure 3(b), at a solar irradiance of 100 W/m? and a temperature of 40 °C.
Figure 3. PV module voltage and power as function of solar irradiance and temperature (a) voltage and (b) power directly converts the voltage level of the PV module into the AC voltage level on the transmitter coil, and the PV module current flows via the transmitter coil and they have a proportional relationship. Additionally, it results from the fact that the electromagnetic field produced by the transmitter coil increases according to the amount of current flowing through it [26]. For the fixed distance between the transmitter and receiver coils of the WPVPT system, a higher electromagnetic field will result in a longer range of the electromagnetic field. As a result, a greater number of electromagnetic field flux will be captured by the receiver coil and it will produce a higher induced voltage, current, and power on the receiver coil. The solar irradiation of 1000 W/m? and a temperature of 25 °C provide the maximum PV module power of 1004 W, as indicated in Figure 3 (b), and the minimum PV module power of 736 W, as shown in Figure 3(b), at a solar irradiance of 100 W/m? and a temperature of 40 °C.
Figure 4. AC power on the receiver coil and efficiency of WPVPT system for the distance between the transmitter and receiver coil, d,;, = 10 m without a magnetic relay (a) AC power and (b) efficiency ~ The WPVPT system is affected by the generating AC power on the receiver coil. Figure 5(b) compares the AC power of the receiver and transmitter coils for a range of solar irradiation from 100 to 1000 W/m? and a range of temperature from 25 °C to 40 °C with a distance between the transmitter and receiver coils of 10 m. The WPVPT system with a magnetic relay has a maximum efficiency of 73.07%, which occurs at solar irradiances of 1000 W/m? and temperatures of 25 °C, and a minimum efficiency of 72.66%, which occurs at solar irradiances of 100 W/m? and temperatures of 35.5 °C. It is possible to state that the efficiency of a WPVPT system with a magnetic relay tends to be between 72.66% and 73.07%, or that its average efficiency is 72.82%, for solar irradiances ranging from 100 to 1000 W/m? and temperatures ranging from 25 °C to 40 °C with a distance between the transmitter and receiver coil of 10 m. As demonstrated in Figure 5(b), the efficiency of the WPVPT system with a magnetic relay is greater than the efficiency of the WPVPT system without a magnetic relay as indicated in Figure 4(b).
Figure 4. AC power on the receiver coil and efficiency of WPVPT system for the distance between the transmitter and receiver coil, d,;, = 10 m without a magnetic relay (a) AC power and (b) efficiency ~ The WPVPT system is affected by the generating AC power on the receiver coil. Figure 5(b) compares the AC power of the receiver and transmitter coils for a range of solar irradiation from 100 to 1000 W/m? and a range of temperature from 25 °C to 40 °C with a distance between the transmitter and receiver coils of 10 m. The WPVPT system with a magnetic relay has a maximum efficiency of 73.07%, which occurs at solar irradiances of 1000 W/m? and temperatures of 25 °C, and a minimum efficiency of 72.66%, which occurs at solar irradiances of 100 W/m? and temperatures of 35.5 °C. It is possible to state that the efficiency of a WPVPT system with a magnetic relay tends to be between 72.66% and 73.07%, or that its average efficiency is 72.82%, for solar irradiances ranging from 100 to 1000 W/m? and temperatures ranging from 25 °C to 40 °C with a distance between the transmitter and receiver coil of 10 m. As demonstrated in Figure 5(b), the efficiency of the WPVPT system with a magnetic relay is greater than the efficiency of the WPVPT system without a magnetic relay as indicated in Figure 4(b).
Figure 5. AC power on the receiver coil and efficiency of WPVPT system with magnetic relay (a) AC power and (b) efficiency
Figure 5. AC power on the receiver coil and efficiency of WPVPT system with magnetic relay (a) AC power and (b) efficiency
Related topics:
PhotovoltaicsEFFICIENCY IMPROVEMENTWireless Power Transfer
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