The system has at least two active inverters (31-38), each characterized by optimal input power and each connected on the input side to at least one DC current generator (21-28) of fluctuating output power, and a measurement device (40). Switching elements...

In an apparatus and a method for isolating a first section (1) of an electrical grid from a second section (2) of the electrical grid, an islanding detection means (11) determines whether the first grid section (1) is switched off, and a disconnecting devi...

A rectifier circuit structure (2) converts an AC current generated in an AC voltage generator into a DC current. A DC current connection (3) links from the rectifier circuit structure to a power converter. A system also includes a medium voltage transforme...

A generator apparatus such as in a cogeneration system has a controlling power supply energized with its generator output with giving no adverse effect on the waveform of its output. An inverter (13) is provided for converting an alternating current output...

A system (10) and method (100) for connecting and synchronizing a supplemental power supply (10) and a power grid. The present invention detects current feedback signals i a and i b and grid phase voltage input signals U a_g , U b_g , and U c_g for control...

A fault on the generator (12) can be detected with the use of a simple arrangement. The output of the generator (12) which has multi-phase winding and is driven by an engine (11) is rectified and then converted by an inverter (133) into an alternating curr...

This can prevent declination in the operational efficiency due to the stop motion of an engine (11) at the cancellation of the interconnection and minimize loads exerted on the startup device for the engine. A system protector (138) is provided for generat...

The transfer switch (6) supplies the DC voltage supplied from the DC power source section (5), to the commercial electricity system (8) in such a way as to provide the DC voltage with the same polarity as the AC voltage generated by the commercial electric...