Patent ID: 8664924

Claim:
A standalone solar energy conversion system with maximum power point tracing, the standalone solar energy conversion system generating a DC current and a DC voltage through a photovoltaic module, the DC current and the DC voltage controlled to provide electric power to supply a load; the standalone solar energy conversion system comprising: a first DC-DC conversion apparatus electrically connected to the photovoltaic module to receive the DC voltage and convert voltage level of the DC voltage to provide a capacitance voltage; a second DC-DC conversion apparatus electrically connected to the first DC-DC conversion apparatus to receive the capacitance voltage and convert voltage level of the capacitance voltage to supply the load; and a control apparatus electrically connected to the first DC-DC conversion apparatus and the second DC-DC conversion apparatus, the control apparatus comprising: a first comparison unit receiving the capacitance voltage and a first capacitance voltage command for comparing the capacitance voltage with the first capacitance voltage command; and a second comparison unit receiving the capacitance voltage and a second capacitance voltage command for comparing the capacitance voltage with the second capacitance voltage command; when the first capacitance voltage command is greater than the capacitance voltage, the control apparatus is configured to control the first DC-DC conversion apparatus to increase input energy; when the first capacitance voltage command is less than the capacitance voltage, the control apparatus is configured to control the first DC-DC conversion apparatus to decrease input energy; when the second capacitance voltage command is greater than the capacitance voltage, the control apparatus is configured to control the second DC-DC conversion apparatus to decrease output energy; and when the second capacitance voltage command is less than the capacitance voltage, the control apparatus is configured to control the second DC-DC conversion apparatus to increase output energy; wherein the first capacitance voltage command is greater than the second capacitance voltage command.