Photovoltaic system, optimizer, and method for adjusting working state of optimizer

A photovoltaic system, wherein the photovoltaic system comprises an optimizer, and the optimizer comprises:

• a controller,
• a first output port,
• a second output port, and
• an electrical signal parameter conversion unit that further comprises a first port configured to be connected to the first output port of the optimizer, a second port configured to be connected to the second output port of the optimizer, a second resistor and a first switch, wherein the second resistor and the first switch are connected in series;
• and when the first switch is open, an impedance value between the first output port and the second output port is an impedance value of an internal resistor of the optimizer;
• or when the first switch is closed, an impedance value between the first output port and the second output port is an impedance value obtained after the internal resistor of the optimizer and the second resistor are connected in parallel;
• and
• the controller is further configured to adjust the working state of the optimizer from the no-output state or the limited-output state to the unlimited-output state when the controller detects that the impedance value between the first output port and the second output port changes from the impedance value of the internal resistor of the optimizer to the impedance value obtained after the second resistor and the internal resistor of the optimizer are connected in parallel.

A photovoltaic system, wherein the photovoltaic system comprises an optimizer, and the optimizer comprises:

• a controller,
• a first output port,
• a second output port, and
• an electrical signal parameter conversion unit that further comprises a first port configured to be connected to the first output port of the optimizer, a second port configured to be connected to the second output port of the optimizer, a third resistor and a second switch, wherein the third resistor and the second switch are connected in parallel;
• and when the second switch is open, an impedance value between the first output port and the second output port is an impedance value obtained after an internal resistor of the optimizer and the third resistor are connected in parallel;
• or when the second switch is closed, an impedance between the first output port and the second output port is zero;
• and
• the controller is further configured to adjust the working state of the optimizer from the no-output state or the limited-output state to the unlimited-output state when the controller detects that the impedance value between the first output port and the second output port changes, to zero, from the impedance value obtained after the third resistor and the internal resistor of the optimizer are connected in parallel.