Abstract: A micro grid stabilization device coupled to a DC bus and an AC bus in parallel is provided. A DC power generation apparatus provides power to the DC bus. An AC power generation apparatus provides power to the AC bus. A converter is coupled between the DC bus and the AC bus to transform the voltage of the DC bus and provide the transformed voltage to the AC bus. When the voltage of the DC bus or the AC bus is unstable, the micro grid stabilization device provides power to at least one of the DC bus and the AC bus to stabilize the power of the DC bus and the AC bus.

Abstract: A micro grid stabilization device coupled to a DC bus and an AC grid in parallel is provided. A DC power generation apparatus provides power to the DC bus. An AC power generation apparatus provides power to the AC grid. A converter is coupled between the DC bus and the AC grid to transform the voltage of the DC bus and provide the transformed voltage to the AC grid. When the voltage of the DC bus or the AC grid is unstable, the micro grid stabilization device provides power to at least one of the DC bus and the AC grid to stabilize the power of the DC bus and the AC grid.

Abstract: An electrical energy supply system providing voltage to a load and including an external power group and a DC supply device is disclosed. The external power group provides an external voltage. The DC supply device includes a bus, a converting unit, a storage unit and a smart energy management system (SEMS). The bus receives the external voltage and is coupled to the load. The converting unit converts the external voltage into a converted voltage or converts a stored voltage to generate a converted result and provides the converted result to the bus. The storage unit stores the converted voltage or provides the stored voltage to the converting unit. The SEMS controls at least one of the converting unit, the external power group and the load according to at least one of the external voltage, a voltage level of the bus and a voltage level of the storage unit.

Abstract: A micro-grid operation system with smart energy management including a power supply system, three micro-grids and an energy management unit is provided. The power supply system generates three phase AC power sources. A first micro-grid receives a first-phase AC power source and is coupled to a first load. A second micro-grid receives a second-phase AC power source and is coupled to a second load. A third micro-grid receives a third-phase AC power source and is coupled to a third load. The energy management unit detects the first, second and third-phase AC power sources to generate a first control signal, a second control signal and a third control signal. The power supply system generates at least one of auxiliary power source to at least one of the first, second and third micro-grids according to the first, second and third control signals.

Abstract: An electrical energy supply system providing voltage to a load and including an external power group and a DC supply device is disclosed. The external power group provides an external voltage. The DC supply device includes a bus, a converting unit, a storage unit and a smart energy management system (SEMS). The bus receives the external voltage and is coupled to the load. The converting unit converts the external voltage into a converted voltage or converts a stored voltage to generate a converted result and provides the converted result to the bus. The storage unit stores the converted voltage or provides the stored voltage to the converting unit. The SEMS controls at least one of the converting unit, the external power group and the load according to at least one of the external voltage, a voltage level of the bus and a voltage level of the storage unit.

Abstract: A combined retardation optical device includes a first retardation optical plate and a second retardation optical plate. The second retardation optical plate contains a flat portion and a multi-step portion. This multi-step portion has several step-like flat surfaces with predetermined heights. The flat portion contacts with the first retardation optical plate. Both the first retardation optical device and the second retardation optical plate are made from birefringent materials. This invention is easy to switch to a different retardation condition for observation. Plus, there is no need to adjust or replace any element.

Abstract: A combined retardation optical device includes a first retardation optical plate and a second retardation optical plate. The second retardation optical plate contains a flat portion and a multi-step portion. This multi-step portion has several step-like flat surfaces with predetermined heights. The flat portion contacts with the first retardation optical plate. Both the first retardation optical device and the second retardation optical plate are made by birefringent materials. This invention is easy to switch to different retardation condition for observation. Plus, there is no need to adjust or replace any element.