Quasi-AC, photovoltaic module for unfolder photovoltaic inverter

A photovoltaic (PV) energy system, the PV energy system comprising:

• a pulsating bus defined by a non-zero average value voltage that is proportional to a rectified utility grid AC supply voltage;
• a plurality of PV modules, each PV module comprising a stiffening capacitor and a PV generator with a corresponding voltage to current converter configured together to convert a PV voltage into a pulsing current that is injected into the pulsating bus, wherein each PV module is directly connected to the pulsating bus, and further wherein each voltage to current converter consists solely of a buck converter, or solely of a boost converter, or solely of an isolated converter, or solely of a boost converter with flyback capability, and further wherein each PV module is coupled to a corresponding voltage to current converter via a corresponding stiffening capacitor;
• and
• a current unfolding circuit configured to control the polarity of AC current injected into the utility grid in response to the injected pulsing currents such that power generated by the plurality of PV modules is transferred to the utility grid, wherein the current unfolding circuit is directly connected to the pulsating bus, and further wherein the current unfolding circuit is coupled to each PV module stiffening capacitor via the corresponding PV module voltage to current converters.