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Method and apparatus for operating a current generation device comprising an inverter

A technology for power generation equipment and inverters, which can be used in output power conversion devices, electrical components, and the conversion of AC power input to DC power output, which can solve problems such as high cost.

Active Publication Date: 2015-06-17
SEG SCHALTANLAGEN ELEKTRONIK GERATE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can only be achieved with multiple inverters and complex upper-level control equipment, and is therefore very costly

Method used

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  • Method and apparatus for operating a current generation device comprising an inverter
  • Method and apparatus for operating a current generation device comprising an inverter
  • Method and apparatus for operating a current generation device comprising an inverter

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Embodiment Construction

[0059] exist figure 1 The frequency is first depicted on the abscissa within the graph, ie, 2kHz-9kHz. As the ordinate plots the ratio of the current in the band I h / I R percentage, where, I h is the current in each band, and I R is the rated current of the device. Curve A, drawn in the 200 Hz band segment, shows by way of example the limit curve preset by the network operator for supplying with a short-circuit power ratio Sk / Snenn=100. where Sk is the grid short-circuit power of the grid nodes where the equipment is connected and Snenn is the rated power of the generating equipment. All curves shown are averages over 10 minutes. Curve B describes the limit curve for the short-circuit power ratio Sk / Snenn=50. That is to say, compared with curve A, the power supply of curve B is weaker. Curves C and D show, by way of example, the harmonics input into the grid by a typical generating plant with a doubly-fed asynchronous generator including inverters on the rotor side an...

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Abstract

The invention relates to a method for operating a current generation device comprising an inverter, to a computer program product for controlling an inverter, to an apparatus for controlling a current generation device comprising an inverter and to a corresponding current generation device. The problem of proposing a method for operating a current generation device comprising an inverter with which the proportion of harmonics is limited in a simple manner such that the specifications of the grid operator are adhered to and nevertheless an optimum power output is provided, is achieved by virtue of the fact that the inverter can be operated at at least two different switching frequencies, wherein the ratio of the operating duration of the inverter at a first switching frequency to the operating duration of the inverter at at least one further switching frequency is selected depending on at least one manipulated variable, and the proportion of harmonics occurring is selected as a manipulated variable.

Description

technical field [0001] The invention relates to a method for operating a power plant with an inverter, a computer program product for controlling a power plant with an inverter, and a power plant. Background technique [0002] A circuit that can convert DC voltage to AC voltage or convert DC current to AC current is called an inverter. Depending on the energy flux, such an inverter can also operate as a rectifier as long as it converts AC voltage to DC voltage or AC current to DC current. Due to the expansion of renewable energy power generation, due to the operation of wind energy equipment, solar energy equipment and hydroelectric power stations, power generation equipment has been added to the power grid, and these power generation equipment supply the generated electricity to the grid through inverters. The same is true for thermal power plants with decentralized generation. In this context, the inverter usually generates the supply voltage of the corresponding phase f...

Claims

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Application Information

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IPC IPC(8): H02M7/5395H02M1/12
CPCH02M1/12H02M7/5395
Inventor 曼弗雷德·施米茨
Owner SEG SCHALTANLAGEN ELEKTRONIK GERATE
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