Power and Energy Engineering

Conventional electric network systems have been well designed, and expanded largely to thousands of kilo-meters, in last 140 years. Smart grid and microgrid concepts tried remodeling this architecture, however, the fundamental mechanism of synchronous system has never changed. An increase of wind energy and photovoltaics is a significant challenge to this synchronous system, because these new energies do not have synchronization mechanism in nature. In order not only to accept but also to fulfill with these free energy in the grid, we have to create a new grid architecture. Digital grid concept proposes the mitigation process to remodeling of the current grid system. First, we propose to segment the conventional grid into smaller grids to create renewable energy-rich “Cell” via asynchrous back to back (BTB) inteface. Second, we propose “Time-based Synchronization” as a new synchronization mechanism for many power conditioners and inverters inside the cell. Third, we propose such BTB interfaces are to be identified with IP addresses, so that all the power transactions are tagged and logged. Our proposal of “Digital Grid Router (DGR)” has these features, which is composed of multiple AC/DC bi-deirectional inverter with common DC bus. DGR will be a software driven inverter with common hadware design. Internet connection of the DGR will provide similar funtion of money server and receiver. Block chain will be a promissing technology for financial side of power, CO2 transaction and those derivatives. Power electronics, internet and fintech will create a new future of grid architecture for renewable energy era.Conventional electric network systems have been well designed, and expanded largely to thousands of kilo-meters, in last 140 years. Smart grid and microgrid concepts tried remodeling this architecture, however, the fundamental mechanism of synchronous system has never changed. An increase of wind energy and photovoltaics is a significant challenge to this synchronous system, because these new energies do not have synchronization mechanism in nature. In order not only to accept but also to fulfill with these free energy in the grid, we have to create a new grid architecture. Digital grid concept proposes the mitigation process to remodeling of the current grid system. First, we propose to segment the conventional grid into smaller grids to create renewable energy-rich “Cell” via asynchrous back to back (BTB) inteface. Second, we propose “Time-based Synchronization” as a new synchronization mechanism for many power conditioners and inverters inside the cell. Third, we propose such BTB interfaces are to be identified with IP addresses, so that all the power transactions are tagged and logged. Our proposal of “Digital Grid Router (DGR)” has these features, which is composed of multiple AC/DC bi-deirectional inverter with common DC bus. DGR will be a software driven inverter with common hadware design. Internet connection of the DGR will provide similar funtion of money server and receiver. Block chain will be a promissing technology for financial side of power, CO2 transaction and those derivatives. Power electronics, internet and fintech will create a new future of grid architecture for renewable energy era.