| 摘要 |
A power conditioning unit with maximum power point tracking (MPPT) including an energy storage capacitor Cdc, for storing energy from a do power source 2, e.g. a solar PV (photovoltaic) panel, for delivering to an ac mains power supply 6 and a do-to-ac converter 5 for converting energy stored in the capacitor to power for the mains power supply. A power injection control block B has a sense input coupled to the energy storage capacitor and controls the do-to ac converter to control the injected mains power. Thus the power injection control block tracks a maximum power point of said dc power source without measuring a dc voltage or do current provided from the do power source. The power injection control block may control an amplitude of an ac current output such that an amount of power transferred to the grid mains is dependent on an amplitude of a sinusoidal voltage component on the energy storage capacitor.
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