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STACOM system for providing reactive and/or active power to a power network

A technology of active power and power grid, applied in the field of transmission grid, which can solve the problems of high voltage level, increased cost, and high cost of DC voltage

Active Publication Date: 2010-08-11
HITACHI ENERGY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the DC / DC converter is complex and costly, in particular since the entire active power has to pass through the DC / DC converter and since the voltage level suitable for VSC can be high, the cost increases considerably
[0012] The cost for overscaling the DC handling capability of the STATCOM so that the STATCOM can handle the changing DC voltage of the connected energy storage is therefore high

Method used

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  • STACOM system for providing reactive and/or active power to a power network
  • STACOM system for providing reactive and/or active power to a power network
  • STACOM system for providing reactive and/or active power to a power network

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Embodiment Construction

[0030] Figures 1-3 have already been discussed in conjunction with the prior art and therefore will not be further described.

[0031] Figure 4 One embodiment of the present invention is illustrated. Specifically, in Figure 4 , a STATCOM (Static Synchronous Compensator, hereinafter simply referred to as STATCOM or static compensator) 11 connected to a power grid 14 is illustrated, which has a desired constant DC voltage level U d . STATCOM 11 is the conventional type and includes a DC link, U d , such as DC capacitor banks (hereinafter DC capacitors), DC / AC converters and transformers T s. The DC / AC converter includes a voltage source converter (VSC) 10 , which converts the DC voltage into a three-phase set of output voltages, or into a single-phase voltage for supply to a power grid 14 . A DC capacitor is connected in parallel with VSC 10 . The main circuit of the STATCOM 11 is the VSC 10, which is therefore designed to handle the injection or absorption of reactive po...

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Abstract

The invention relates to a static compensator (11) system for providing reactive and / or active power to a power network (14). The system comprises a static compensator (11), which comprises a DC capacitor (Ud ) and voltage source converter (10). The static compensator (11) is connected to an energy storage device (12). The system further comprises a booster converter device (13) connected in series with the energy storage device (12) and in parallel with the DC capacitor ( Ud ) of the static compensator (11). The booster converter device (13) and the energy storage device (12) are further connected in parallel with the voltage source converter (10) of the static compensator (11).

Description

technical field [0001] The present invention relates generally to the field of transmission grids, and in particular to reactive power support for transmission grids. Background technique [0002] Transmission grids that deliver electricity to consumers must be able to handle voltage imbalances or instability, voltage dips, poor power factor, distortion or flicker that occur within the grid. Reactive power control is a way to solve such a problem. [0003] A STATCOM (Static Compensator) is an electrical device that is based on Voltage Source Converter (VSC) technology and can be used to provide reactive power support to the transmission grid. The STATCOM is capable of generating or absorbing reactive power and can be regulated by a high-speed control system. [0004] Figure 1 illustrates a basic STATCOM arrangement. In the basic configuration, the STATCOM 1 consists of a DC voltage source 2 , a DC / AC inverter 3 (voltage source converter VSC) and a transformer 4 . Adjusti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18
CPCY02E40/16H02J3/1842Y02E40/22Y02E40/10Y02E40/20
Inventor L·昂格基斯特
Owner HITACHI ENERGY LTD
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