Topological structure of multi-port DC transformer substation and control method thereof

A technology of topology structure and control method, applied in the field of power system, can solve the problems of poor economy, incapable flow, low reliability, etc., and achieve the effect of major technology, high reliability and scalability

Inactive Publication Date: 2014-07-02
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a multi-port DC substation topology and its control method in view of the problems of low reliability, complex control, inability to carry out centralized power flow control, and poor economy in current DC power grids

Method used

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  • Topological structure of multi-port DC transformer substation and control method thereof
  • Topological structure of multi-port DC transformer substation and control method thereof
  • Topological structure of multi-port DC transformer substation and control method thereof

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Embodiment Construction

[0033] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings.

[0034]The present invention proposes a topology structure of a multi-port DC substation, which is composed of multiple port circuits; wherein each port circuit includes a commutation port, an LCL filter, and an AC circuit breaker, and each commutation port Connect to the LCL filter and AC circuit breaker on the port circuit in turn, and connect to other port circuits through the AC transformer, or each commutation port passes through the LCL filter, AC circuit breaker and other ports on the port circuit in turn The port circuits are connected; the number of port circuits contained in the multi-port DC substation is not less than 2, and the number of port circuits can be expanded according to needs; the port that establishes the AC bus voltage in the station is the main port, and the other ports are slave ports; according to the port circuit As the number increase...

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Abstract

The invention provides a topological structure of a multi-port DC transformer substation and a control method thereof. The functions of different dual-port DC/DC converters are fused, the topological structure can be interconnected with different types of multiple-voltage-grade offshore DC wind power plants and high voltage DC power transmission systems similar in the way that AC networking is achieved through an AC transformer substation and DC networking is achieved through a DC transformer substation, centralized control of DC power flow can further be conducted, and normal work of the DC power transmission systems at other ends can not be affected when the DC power transmission system at one end breaks down. High reliability and extensibility are achieved, the number of ports can be increased or decreased according to actual demands, and great technological, economical and social significance is achieved.

Description

technical field [0001] The invention belongs to the technical field of electric power systems, and in particular relates to a topology structure of a multi-port DC substation and a control method thereof. Background technique [0002] As the latest technology development trend of global wind power, offshore wind power has been attracting much attention, and it is the new technology most likely to reduce the cost of wind power generation in the future. With the increase of installed capacity and transmission distance of offshore wind farms, the application of HVDC transmission technology in offshore wind power grid integration will become more and more extensive. Compared with the traditional direct current transmission (LCC-HVDC) based on current source converter technology, the new direct current transmission (VSC-HVDC) based on voltage source converter technology has more advantages in grid connection of offshore wind farms. Compared with double-terminal direct current tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00
Inventor 索之闻李庚银迟永宁王伟胜李琰孙蔚李想
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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