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Method and system for controlling stability of voltage of ultra-high-voltage direct-current layered feed-in power grid

A technology of UHV DC and grid voltage, which is applied in the field of power system and can solve the problem of serious threat to the stability of voltage support capability

Active Publication Date: 2019-02-19
CHINA ELECTRIC POWER RES INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the power grid at the receiving end, with the increase in the number and capacity of DC feed-in, the threat to stability caused by insufficient voltage support capacity is becoming more and more serious

Method used

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  • Method and system for controlling stability of voltage of ultra-high-voltage direct-current layered feed-in power grid
  • Method and system for controlling stability of voltage of ultra-high-voltage direct-current layered feed-in power grid
  • Method and system for controlling stability of voltage of ultra-high-voltage direct-current layered feed-in power grid

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Embodiment Construction

[0027] 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.

[0028] 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 over...

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Abstract

The invention discloses a method and system for controlling stability of voltage of an ultra-high-voltage direct-current layered feed-in power grid, and belongs to the technical field of electrical power systems. The method comprises the following steps: acquiring a low-value threshold UcthL, a high-value threshold UcthH and a set time threshold delta Teth of a voltage Uc of commutation buses of ahigh-end inverter and a low-end inverter; monitoring the voltage Uc of the commutation buses of the high-end inverter and the low-end inverter and the lasting time delta Te of the voltage Uc in realtime by using a voltage acquiring and measuring device; and when the voltage Uc of the commutation buses of the high-end inverter and the low-end inverter is smaller than the set low-value threshold UcthL and the lasting time delta Te is longer than the set time deltah Teth, starting direct-current power emergency fall-back control, and when the voltage Uc of the commutation buses of the high-endinverter and the low-end inverter recovers to be increased and is greater than the high-value threshold UcthH and the lasting time delta Tr is longer than the set time threshold delta Trth, starting direct-current power slow-speed increasing control. The stability of the voltage of the ultra-high-voltage direct-current layered feed-in power grid is controlled, and stable running of an alternating-current and direct-current parallel and series system is ensured.

Description

technical field [0001] The present invention relates to the technical field of electric power system, and more specifically, relates to a method and system for controlling the voltage stability of UHV DC stratified feed-in grid. Background technique [0002] my country's primary energy-rich areas such as coal, hydropower, wind energy, and solar energy have reverse distribution characteristics with the economically developed energy-concentrating areas in the central and eastern regions. This feature objectively requires the vigorous development of large-capacity long-distance high-efficiency transmission-UHVDC transmission technology to improve the ability and efficiency of optimal allocation of resources. In the power grid at the receiving end, with the increase in the number and capacity of DC feed-in, the stability threat caused by insufficient voltage support capacity is becoming more and more serious. In order to alleviate the adverse effects of large-capacity UHV DC si...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 郑超吕盼苗淼宋新甫马世英高凯李惠玲汤伟吕思卓张鑫
Owner CHINA ELECTRIC POWER RES INST
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