Patent ID: 8314512

Claim:
A direct-current (DC) power system, the DC power system comprising: a DC bus; a solar energy module comprising: at least one High Concentration Photovoltaic (HCPV) module, each HCPV module having an active sun tracker and a Building-Integrated Photovoltaic (BIPV) module , said solar energy module transforming solar energy into electric energy to be output through the DC bus; a storage bank, said storage bank being a storage device of solar energy that charges and discharges electric energy and buffers a voltage on said DC bus; a maximum power point tracking (MPPT) converter, said MPPT converter being connected between said solar energy module and said storage bank, said MPPT converter saving energy outputted from said solar energy module into said storage bank, said MPPT converter performing a calculation of a polynomial relation of voltage and current and stabilizing voltage outputted from said solar energy module and outputting said voltage from said solar energy module into said DC bus, said MPPT converter monitoring a voltage on said DC bus to cut off said storage bank and close said DC power system when said monitored voltage is greater than a preset value; and an inverter, said inverter being connected with an alternating-current (AC) grid through said DC bus.