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A method and system for controlling AC faults at a receiving end of a hybrid HVDC system

A technology of DC current and power transmission system, applied in the direction of power transmission AC network, AC network circuit, circuit device, etc., can solve the problems of DC discontinuity and high overvoltage

Active Publication Date: 2018-12-11
CHINA ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the use of voltage margin control strategy, it will bring the risk of DC discontinuity and may lead to higher overvoltage

Method used

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  • A method and system for controlling AC faults at a receiving end of a hybrid HVDC system
  • A method and system for controlling AC faults at a receiving end of a hybrid HVDC system
  • A method and system for controlling AC faults at a receiving end of a hybrid HVDC system

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Embodiment Construction

[0041] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0042]Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overl...

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Abstract

The invention discloses a method for controlling AC faults at receiving ends of a hybrid HVDC transmission system. The method comprises the following steps: measuring DC voltage at LCC side of a linerectifier converter to obtain DC voltage value; When the DC voltage on the LCC side of the line rectifier converter is higher than 1.05 pu, changing the control strategy of the hybrid HVDC system fromconstant current control to maximum trigger angle control; Measuring the DC current on the LCC side of the line rectifier converter to obtain the DC current value; Judging whether the DC current value is greater than the DC current intermittent setting value; When the DC current value is greater than the DC current intermittent setting value, keeping a control strategy of maintaining a maximum trigger solution control; Adjusting the trigger angle of the line rectifier LCC side according to the instantaneous power of the voltage source converter VSC side after receiving the AC system operationsignal of the voltage source converter VSC side; After receiving the VSC side AC system fault clearing signal of the voltage source converter, switching to the control strategy of constant current control.

Description

technical field [0001] The present invention relates to the field of electrical technology, and more specifically, to a method and system for controlling AC faults at a receiving end of a hybrid direct current transmission system. Background technique [0002] The line commutated converter type HVDC transmission system (Line Commutated Converter, LCC-HVDC) based on thyristor technology has been widely used in long-distance large-capacity power transmission, asynchronous networking and other occasions, but it has the problem of commutation failure on the inverter side. The high-voltage DC transmission system (Voltage Source Converter, VSC-HVDC) based on the voltage source converter has been rapidly developed due to its independent control of active power and reactive power, the ability to work in passive systems, and not being affected by commutation failures. Development, but it has the disadvantages of high cost and large operation loss. Hybrid DC transmission system (LCC-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 陈争光王兴国杜丁香李岩军周泽昕王德林吕鹏飞刘宇刘丹郭雅蓉曹虹程琪
Owner CHINA ELECTRIC POWER RES INST
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