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Voltage Control in DC Power Systems

A technology of power system and direct current transmission line, applied in the field of power transmission system, can solve the problem of unusable control of DC voltage, and achieve the effect of easy transportation and simplified design

Active Publication Date: 2016-06-29
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if you do this, you cannot use the above method of controlling the DC voltage

Method used

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  • Voltage Control in DC Power Systems
  • Voltage Control in DC Power Systems
  • Voltage Control in DC Power Systems

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Embodiment Construction

[0034] A direct current power system comprising a converter station according to the invention will be described below with respect to a power transmission system, and then more particularly with respect to a high voltage direct current (HVDC) power transmission system. However, it should be realized that the invention is not limited to this type of system, but is applicable to any type of DC system employing converter valves, for example to back-to-back DC systems.

[0035] exist figure 1 An HVDC system 10 for connection between two alternating current (AC) power lines 30 and 32 is schematically shown in . Each of these power lines 30 and 32 may be part of an AC power transmission system. The HVDC system 10 includes a first substation or converter station 12 and a second substation or converter station 16, wherein the first converter station 12 includes a first transformer 18 and a first inverter for converting between AC and DC. converters 20, wherein the first converter 2...

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PUM

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Abstract

A converter station (12) in a direct current power system (10) connected between an alternating current power line (30) and a direct current power line (14) comprises a transformer (18), a converter (20) equipped with converter valves of which at least a first set is connected to the transformer and a control unit (22) controlling the converter station for providing a DC voltage (VDC1) at one end of the direct current power line for contributing to the forming of a voltage difference together with another DC voltage (VDC2) generated by a further converter station (16) at an opposite end of the direct current power line for enabling a feeding of power over the direct current power line. The control unit controls the converter to provide a DC voltage through using firing angle control of the converter valves connected to the transformer.

Description

technical field [0001] The present invention generally relates to power transmission systems. More specifically, the invention relates to a converter station in a direct current power system, a method and a computer program product for controlling such a converter station and the DC voltage provided by such a system. Background technique [0002] In power systems, such as power transmission systems, and then especially in high voltage direct current (HVDC) power transmission systems, the voltages used for power transmission are becoming higher and higher. Today, 800kV is used in many cases. However, even higher levels such as 1000 kV or even 1200 kV are envisioned in the future. Here, a converter in a converter station typically converts between a high AC voltage and such a high DC voltage. [0003] Using such a high level can cause various types of problems. One particular class of problem is insulation. Special measures may need to be taken in order to ensure that the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/45H02M7/757H02J3/36
CPCH02M7/7575H02J3/36H02M5/4505Y02E60/60
Inventor G.弗利斯贝格U.阿斯特伦
Owner HITACHI ENERGY SWITZERLAND AG