Abstract:
A method for operating a first energy generator in an electric power supply system to which a plurality of electric consumers and at least the first energy generator, which is embodied as a regenerative energy generator, are connected via respectively one grid connection point each assigned thereto, wherein at least the first energy generator has an inverter of predetermined power rating, the AC voltage output of which is electrically connected to a first grid connection point assigned thereto, and wherein the operating control of the inverter regarding its reactive power feed and/or its reactive power draw into or out of the electric power supply system takes place depending on a continuously measured mains voltage value. The reactive power control in the energy grid is improved in that the mains voltage value is measured at a second grid connection point, which is different from the first grid connection point of the energy generator.
Abstract:
For network stabilization of an electric power supply network, the voltage at a first network connection point at a first voltage level to a power generator, and at a second network connection point to a second voltage level, as well as at at least one third network connection point to a load, are each sensed as a voltage measurement, wherein a reactive power draw or a reactive power delivery by the power generator is ascertained using a linkage of the voltage measurements with the geographic location of the relevant network connection point.
Abstract:
A photovoltaic system having a photovoltaic generator, whose strings with series-connected photovoltaic modules have a positive pole and a negative pole, and with an inverter whose DC input is connected to the two poles. The voltage of the positive pole and/or of the negative pole is measured with respect to ground, and a first switching element located between the positive pole and the DC input of the inverter and/or a second switching element located between the negative pole and the DC input of the inverter is opened, while a third switching element located between the positive pole and the negative pole is closed, when the voltage of the positive pole or of the negative pole exceeds a predefined first or second limit value.
Abstract:
A photovoltaic system comprises a plurality of photovoltaic modules which are electrically connected to a string or to multiple parallel-connected strings and form a PV generator. The first string end forms the negative pole of the photovoltaic generator, and the second string end forms the positive pole. A voltage reduction device is provided with the aid of which the potential of the negative pole is lowered to ground. Advantages with regard to the insulation class of the connecting cable used are also provided.
Abstract:
A method and a device for carrying out the method are disclosed in order to aid in the search for faulty photovoltaic modules. In a photovoltaic system comprising multiple PV units electrically connected in parallel, each PV unit is assigned its own fixed current sensor. Furthermore, each PV unit can be removed from the parallel circuit by a switching device.
Abstract:
An outdoor photovoltaic generator is provided that has a plurality of straight, parallel rows of rectangular photovoltaic modules that are located on a substructure, each of which comprises a plurality of photovoltaic cells. The photovoltaic cells are arranged on each photovoltaic module such that, in the event of a shading extending parallel to an edge of the photovoltaic module, the energy conversion and transport function of the remaining, unshaded photovoltaic cells or photovoltaic cell regions of the photovoltaic module is maintained. The substructure provides equal inclination of the photovoltaic modules with respect to south. The rows with respect to the east-west direction are installed rotated at an angle between 10° and 40° toward the northeast or toward the northwest. In exchange for acceptance of a reduction in the total output of photovoltaically produced energy as seen over the course of the day, the arrangement permits a displacement of the maximum output to a time of day other than 12:00 noon.
Abstract:
A housing having three side walls and a cover is provided, wherein an opening for introducing a pipe is formed in one of the side walls. The side walls are arranged in a U-shape, with the opening being provided in the side wall forming the first side thereof, and with a pipe section that aligns with the opening being connectable to the second side forming the opposite side wall thereof. The cross-section of the pipe section, in particular its diameter, is larger or smaller than the cross-section of the pipe. As a result, the pipe and the pipe section can be slid one inside the other.
Abstract:
A method and a device for carrying out the method are disclosed in order to aid in the search for faulty photovoltaic modules. In a photovoltaic system comprising multiple PV units electrically connected in parallel, each PV unit is assigned its own fixed current sensor. Furthermore, each PV unit can be removed from the parallel circuit by a switching device.
Abstract:
A lightweight support includes a corrugated base body having an elongated rectangular configuration defining an upper longitudinal rim and a lower longitudinal rim. The base body is composed of a first layer made of metal, a second layer which is made of rigid foam and applied onto the first layer, and a third layer which is made of metal and applied onto the second layer. Stabilization rails are attached to the base body in order to maintain integrity of the lightweight support when subject to stress. The stabilization rails can hereby be placed on or at or integrated in the upper and lower longitudinal rims, respectively.
Abstract:
A supporting structure for an open-space photovoltaic system with several ground supports arranged in at least two mutually parallel rows oriented in essentially North-South direction and installed vertically in the ground, with beams supported on free ends of the ground supports located at the same location along a row, and with module rails attached to the beams for attachment of fastening means for photovoltaic modules. The module rails are secured on or between two corresponding adjacent beams in essentially North-South direction. The free ends of the ground supports are positioned at the same height above terrain ground, so that the beams and the module rails extend essentially plane-parallel to the terrain ground. This arrangement reduces material consumption, and only a small surface area of the supporting structure is effectively exposed to wind gusts. Each row of ground supports includes ground supports with both rigid and flexible flexural characteristics.