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Zero-power starting method for direct current transmission system

A direct current transmission system and zero power technology, applied in the direction of direct current network circuit devices, electrical components, circuit devices, etc., can solve problems such as inability to start direct current, weak AC power grid at the end, and grid impact, etc., to reduce impact, voltage and current Steady, builds a steady effect

Active Publication Date: 2014-12-24
NR ELECTRIC CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the initial stage of black start of the grid, the AC grid at the receiving end is extremely weak, starting the DC according to the conventional starting method of the DC transmission system will have a great impact on the grid, and even the DC start cannot be performed

Method used

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  • Zero-power starting method for direct current transmission system

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Embodiment Construction

[0026] According to the present invention, the power transmitted from the sending end to the receiving end of the direct current transmission system during the start-up process is zero, as follows:

[0027] 1. Set the zero-power start mode and zero-power start button on the background screen of the operation personnel, and the zero-power start button can only be operated after the operation is put into the zero-power start mode;

[0028] 2. Before starting the pole, set the power transmission direction of pole 1 to forward transmission (station 1 is a rectification station, station 2 is an inverter station), and set the power transmission direction of pole 2 to reverse transmission (station 2 is a rectification station, station 1 is the inverter station), the details are as attached figure 1 or, set the power transmission direction of pole 2 to forward transmission (station 1 is a rectification station, station 2 is an inverter station), and set the power transmission directio...

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Abstract

The invention discloses a zero-power starting method for a direct current transmission system. Single-pole full-voltage starting, single-pole reduced-voltage starting, double-pole full-voltage starting and double-pole reduced-voltage starting are adopted in a common direct current transmission system starting method, and due to the fact that the common starting method is limited by the minimum starting current and the minimum starting voltage, power cannot start from zero after the direct current system is started. The power transmission directions of two poles of the direct current transmission system are set to be different, the unlocking time sequences of the two poles are coordinated, the voltage and the current of the two poles are established at the same time, and therefore the power from a sending end to a receiving end is zero after the direct current system is started, and then the power from the sending end to the receiving end can be adjusted by adjusting the power of a positive sending pole. When a sending end or receiving end power grid is a weak alternating current system, the impact to the alternating current system can be lowered through the starting mode.

Description

technical field [0001] The invention relates to a starting method for a high-voltage / ultra-high voltage direct current transmission system, which is applied to the field of control and protection of high-voltage / ultra-high voltage direct current transmission and a control and protection device. Background technique [0002] The HV / UHV DC transmission system includes a rectifier station and an inverter station. Starting means that the inverter station and the rectifier station of the same pole are unlocked separately, and the power flow between the two sides is established, and the power direction is sent from the rectifier station to the inverter station. Conventional DC transmission system starting methods include unipolar full voltage starting, unipolar reduced voltage starting, bipolar full voltage simultaneous starting, and bipolar reduced voltage simultaneous starting. [0003] Since the DC current rectified by the converter is not straight, but superimposed with ripple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J1/00
CPCY02E60/60
Inventor 李林王永平赵文强刘建坤周前
Owner NR ELECTRIC CO LTD
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