Photovoltaic module and photovoltaic system including the same
Disclosed are a photovoltaic module and a photovoltaic system including the same. The photovoltaic module includes a solar cell module, a converter to convert a DC voltage from the solar cell module, an inverter to convert the DC voltage from the converter into an AC voltage, and a plug to outwardly output the AC voltage from the inverter, the plug having a ground terminal. The ground terminal is electrically connected to a ground of the inverter, and the ground of the inverter is electrically connected to a ground of the solar cell module. Thereby, the AC voltage from the photovoltaic module is directly supplied to an outlet inside or outside a building.
1. A photovoltaic module comprising:
a solar cell module;
a converter to convert a direct current (DC) voltage from the solar cell module;
an inverter to convert the DC voltage from the converter into an alternating current (AC) voltage;
a plug to outwardly output the AC voltage from the inverter, the plug having a ground terminal;
a first interface unit to receive an AC voltage from an adjacent photovoltaic module;
a second interface unit to output the AC voltage from the first interface unit and the AC voltage from the inverter to the plug; and
a cable provided in order to electrically connect the first interface unit and the second interface unit to each other,
wherein a first connector for coupling with the first interface unit is connected to one end of the cable, and the other end of the cable is electrically connected to the second interface unit,
wherein the ground terminal of the plug is electrically connected to a ground terminal of the inverter,
wherein the ground terminal of the inverter is electrically connected to a ground line of the solar cell module,
wherein the plug is connected to an outlet including a ground terminal or a connector including a ground terminal, and
wherein the ground terminal of the plug is connected to the ground terminal of the outlet or the ground terminal of the connector.
2. The photovoltaic module according to claim 1 , further comprising a conductive member connected between a frame of the solar cell module and a frame of a junction box that includes the inverter, in order to electrically interconnect the ground line of the solar cell module and a ground of the junction box.
3. The photovoltaic module according to claim 2 , wherein the frame of the junction box and the ground terminal of the inverter are electrically interconnected.
4. The photovoltaic module according to claim 2 , wherein the junction box further includes at least one bypass diode to receive the DC voltage, from the solar cell module, and the converter.
5. The photovoltaic module according to claim 1 , further comprising a controller to control the converter,
wherein the converter includes a plurality of interleaving converters.
6. The photovoltaic module according to claim 5 , wherein the control) varies a switching period for switching elements of the interleaving converters.
7. The photovoltaic module according to claim 5 , wherein the converter performs power conversion of the DC voltage so as to output a pseudo DC voltage, and
wherein the controller varies a switching period for switching elements of the interleaving converters based on a duty for driving the switching elements of the interleaving converters.
8. The photovoltaic module according to claim 5 , wherein the interleaving converters include tapped inductor converters.
9. The photovoltaic module according to claim 5 , wherein the interleaving converters include flyback converters.
10. A photovoltaic system comprising:
a plurality of photovoltaic modules each including a plug provided with a ground terminal;
a connector connected to each plug of the photovoltaic modules; and
an integration plug connected to the connector and provided with a ground terminal,
wherein each of the photovoltaic modules includes:
a solar cell module;
a converter to convert a DC voltage from the solar cell module;
an inverter to convert the DC voltage from the converter into an AC voltage;
the plug to outwardly output the AC voltage from the inverter, the plug being provided with the ground terminal;
a first interface unit to receive an AC voltage from an adjacent photovoltaic module;
a second interface unit to output the AC voltage from the first interface unit and the AC voltage from the inverter to the plug; and
a cable provided in order to electrically connect the first interface unit and the second interface unit to each other,
wherein a first connector for coupling with the first interface unit is connected to one end of the cable, and the other end of the cable is electrically connected to the second interface unit,
wherein the ground terminal in each plug of the photovoltaic modules is electrically connected to a ground terminal of the inverter,
wherein the ground terminal of the inverter is electrically connected to a ground line of the solar cell module,
wherein each plug of the photovoltaic modules is connected to an outlet including a ground terminal or a connector including a ground terminal, and
wherein the ground terminal of the plug is connected to the ground terminal of the outlet or the ground terminal of the connector.
11. The photovoltaic system according to claim 10 , further comprising a conductive member connected between a frame of the solar cell module and a frame of a junction box that includes the inverter, in order to electrically interconnect the ground line of the solar cell module and a ground of the junction box.
12. The photovoltaic system according to claim 11 , wherein the frame of the junction box and the ground terminal of the inverter are electrically interconnected.