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Apparatus for feeding electrical energy into an energy supply system and DC voltage transformer for such an apparatus

A voltage converter and voltage generator technology, applied in the output power conversion device, the irreversible DC power input into the AC power output, the instrument and other directions, can solve the problem of not allowing monitoring, and achieve the effect of increasing the cost

Inactive Publication Date: 2010-03-24
SMA SOLAR TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, this device does not allow monitoring of the ground conductor leading from the ground terminal to the DC voltage generator with respect to fault currents, since in principle the operating current also flows in this ground conductor

Method used

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  • Apparatus for feeding electrical energy into an energy supply system and DC voltage transformer for such an apparatus
  • Apparatus for feeding electrical energy into an energy supply system and DC voltage transformer for such an apparatus
  • Apparatus for feeding electrical energy into an energy supply system and DC voltage transformer for such an apparatus

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Embodiment Construction

[0022] according to figure 1 , the device for generating electrical energy includes a DC voltage generator 1 , a DC voltage converter 2 , and a converter 3 . The DC voltage generator 1 comprises, for example, a photovoltaic or fuel cell generator and comprises a capacitor C connected in parallel thereto at the two outputs 4(+) and 5(-).

[0023] Within the scope of the present application, the preferred converter 3 comprises two outputs 6, 7, which are used here for the single-phase supply of electrical energy to the grid 8, the phase line L of which is connected to the output 6, zero or neutral Conductor N is connected to output 7 . Converter 3 additionally comprises three inputs E1 , E2 , E3 . Between the inputs E1 and E2, two series-connected capacitors C1 and C2 are arranged, the connection point of which is at the input E3. Capacitors C1 and C2 form a conventional bipolar voltage intermediate circuit of converter 3 . Such as figure 1 As shown, the converter 3 is co...

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PUM

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Abstract

The invention describes an apparatus for feeding electrical energy into an energy supply system (8) with a DC voltage transformer (2), which is intended to be connected to a DC voltage generator (1), and an inverter (3) which is connected to the DC voltage transformer (2) and is intended to be connected to the energy supply system (8), with a bipolar voltage intermediate circuit. The DC voltage transformer (2) is constructed according to the invention in such a way that the DC voltage generator (1) can be grounded either at the negative, positive or any central output. For this purpose, a storage inductor (16) is provided which is switched both in a charging cycle and in a discharging cycle in such a way that no currents flow via a grounding line (19) during normal operation.

Description

technical field [0001] The invention relates to a device of the type stated in the preamble of claim 1, and to a DC voltage converter suitable therefor. Background technique [0002] Various types of converters are used to feed electrical energy generated by a DC voltage generator, such as a photovoltaic or fuel cell generator, to an AC grid, in particular to a mains grid (50 / 60 Hz). Between the DC voltage generator and the converter, a DC voltage converter (DC-DC chopper) for converting the DC voltage supplied by the DC voltage generator into the DC voltage required by the converter or adapt. [0003] For different reasons it is desirable to ground one of the outputs of the DC voltage generator. Grounding is desirable because, on the one hand, certain countries require such grounding. On the other hand, when grounding is missing, different disadvantages arise in operation. One problem is high frequency leakage current. Due to the unavoidable parasitic capacitance betwe...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M3/158H02M7/48
CPCH02M7/48H02M2001/007Y02E10/563H02J3/383H02J3/382H02M7/487H02J2300/10H02J2300/24H02J3/381Y02E10/56H02M1/007H02M7/537
Inventor P·扎查里阿斯B·沙汉
Owner SMA SOLAR TECH AG
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