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Method for starting ultra-weak receiving-end high-voltage direct-current power transmission system by using static synchronous compensation

A technology of static synchronous compensation and high-voltage direct current transmission, applied in flexible AC transmission systems, reactive power adjustment/elimination/compensation, power transmission AC networks, etc., can solve problems such as weak reactive power adjustment capabilities, and avoid commutation failure, improved voltage characteristics, and reduced commutation failure effects

Inactive Publication Date: 2013-01-23
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

In traditional HVDC, the control quantity is only the trigger angle, which can only control active power, and the ability to adjust reactive power is very weak.

Method used

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  • Method for starting ultra-weak receiving-end high-voltage direct-current power transmission system by using static synchronous compensation
  • Method for starting ultra-weak receiving-end high-voltage direct-current power transmission system by using static synchronous compensation
  • Method for starting ultra-weak receiving-end high-voltage direct-current power transmission system by using static synchronous compensation

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Embodiment Construction

[0023] The invention provides a method for starting a very weak receiving end high-voltage direct current transmission system by using a static synchronous compensator. The present invention will be described below in conjunction with the accompanying drawings.

[0024] The method for starting the extremely weak receiving end high-voltage direct current transmission system by using the static synchronous compensator is described as follows:

[0025] System diagram such as figure 1 As shown in the figure, the STATCOM and HVDC are connected in parallel to the same B2 bus of the AC system at the receiving end, and the AC system S at the sending end 1 Connect the first system impedance Z 1 , the first system impedance Z 1 , the first filter LB1 and the first converter transformer T of the HVDC subsystem 1 Commonly connected to the B1 busbar, the HVDC subsystem consists of a first converter transformer T 1 , rectifier, DC transmission line, inverter and second converter transf...

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Abstract

The invention discloses a method for starting an ultra-weak receiving-end high-voltage direct-current (HVDC) power transmission system by using a static synchronous compensator (STATCOM), belonging to the technical field of HVDC power transmission. The system is characterized in that a STATCOM and HVDC are connected to a same bus of an alternating-current system in parallel, and a STATCOM subsystem is connected with the same bus of an HVDC subsystem receiving-end alternating-current system through a current conversion reactor (X1). According to the method, a substep starting manner is adopted, and during starting, the STATCOM subsystem is subjected to the composite control of a series-connection current limiting resistor and current decoupling and voltage feedforward control; and soft wart is adopted for the HVDC subsystem, and the setting value of a current regulator is gradually increased in a start process till the finish of the start. According to the invention, the HVDC system can be started to a rated running state under the condition that a receiving end system is an ultra-weak alternating-current system, the voltage property of the HVDC receiving-end alternating system is improved, and the HVDC system is prevented from failed commutation.

Description

technical field [0001] The invention belongs to the technical field of high-voltage direct current transmission, and in particular relates to a method for starting a very weak receiving end high-voltage direct current transmission system by using static synchronous compensation. Background technique [0002] High Voltage Direct Current (HVDC) has been greatly developed since it was applied in power systems in the 1950s, and has become one of the most successful applications of modern power electronics technology in power systems. According to statistics, from 1954 to 2004, there were 95 HVDC projects put into operation in the world, most of which used ordinary thyristor converter valves for commutation. Since the Zhoushan DC transmission project in 1987, 19 high-voltage DC transmission projects have been completed and put into operation in my country. [0003] Since HVDC converters use ordinary thyristors without self-shutdown capability as commutation components, HVDC oper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/18
CPCY02E40/16Y02E60/60Y02E40/10
Inventor 赵成勇倪俊强张岩坡郭春义
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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