Abstract: A method and apparatus for an interface switch having an external terminal electrically connected to an AC voltage E at a frequency ?0 (for example a utility supply), and an internal terminal electrically connected to an AC voltage V at a selectable frequency ? (for example a microsource). In one embodiment, the interface switch is closed when the voltage difference between E and V and the relative phase angle ?EV between E and V are both small, and when the higher frequency voltage (as between E and V) leads the lower frequency voltage. In another embodiment, the interface switch is closed when the envelope of the voltage difference between E and V reaches a local minimum at a point of inflection.

Abstract: A method of controlling the output inverter of a microsource in a distributed energy resource system is disclosed. Embodiments of the invention include using unit or zone power controllers that reduce the operating frequency of the inverter to increase its unit output power. Preferred embodiments includes methods wherein the inverter reaches maximum output power and minimum operating frequency at the same time, and further comprising using a voltage controller implementing a voltage vs. reactive current droop. Other aspects of this embodiment relate to an inverter that implements such methods, and a microsource containing such an inverter. These methods can be extended to control inverters in a plurality of microsources, organized in a single zone or in a plurality of zones.

Abstract: A brick placing machine consisting of a horizontally disposed substantially rectangular rectangle the length of which corresponds approximately to the maximum width or height of any brick panel to be formed, a substantially horizontal mould on which a brick panel can be formed arranged adjacent to the receptacle the receptacle being constructed to receive bricks constituting part of a panel, the bricks being arranged in the receptacle in a configuration in which they are to be placed on the mould, the receptacle having in it clamps for clamping the bricks in their correct relative positions with appropriate spaces between bricks and between courses of bricks for the reception of mortar, the receptacle being movable to a position over the mould in which position the clamps are released to leave the bricks on the mould in the desired position, the receptacle then being moved clear of the bricks placed on the mould and moved relative to the mould so that the receptacle can be suitable refilled with bricks and th

Abstract: A brick placing machine consisting of a horizontally disposed substantially rectangular rectangle the length of which corresponds approximately to the maximum width or height of any brick panel to be formed, a substantially horizontal mould on which a brick panel can be formed arranged adjacent to the receptacle the receptacle being constructed to receive bricks constituting part of a panel, the bricks being arranged in the receptacle in a configuration in which they are to be placed on the mould, the receptacle having in it clamps for clamping the bricks in their correct relative positions with appropriate spaces between bricks and between courses of bricks for the reception of mortar, the receptacle being movable to a position over the mould in which position the clamps are released to leave the bricks on the mould in the desired position, the receptacle then being moved clear of the bricks placed on the mould and moved relative to the mould so that the receptacle can be suitable refilled with bricks and th