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Topological structure of hybrid direct-current power transmission system based on auxiliary power supply and starting method

A technology of auxiliary power supply and power transmission system, which is applied in the direction of power transmission AC network, electrical components, output power conversion device, etc. The effect of reducing shock, prolonging service life and protecting power equipment

Active Publication Date: 2014-01-22
WUHAN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to the particularity of the hybrid DC power transmission system - including the unidirectional flow of the power flow and the inconsistency of the start-up conditions of the converter stations at both ends, when connecting the AC system, most of the current hybrid DC systems prefer to choose the VSC side as constant DC voltage control. This has greatly restricted the overall control strategy and application fields of the hybrid DC transmission system. When LCC is used as an inverter station to realize DC voltage control (or constant arc extinguishing angle control), the difficulty lies in the starting conditions of VSC and LCC. contradict each other, in order to solve this bottleneck, it is necessary to solve the start-up problem of the hybrid HVDC system in this application scenario

Method used

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  • Topological structure of hybrid direct-current power transmission system based on auxiliary power supply and starting method
  • Topological structure of hybrid direct-current power transmission system based on auxiliary power supply and starting method
  • Topological structure of hybrid direct-current power transmission system based on auxiliary power supply and starting method

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Embodiment

[0022] Such as figure 1 is the topology diagram of the entire hybrid DC power transmission start-up system, where 1 is the two-terminal AC system, 2.1 is the first AC circuit breaker, 2.2 is the second AC circuit breaker, 2.3 is the second AC circuit breaker, and 3.1 is the first converter transformer, 3.2 is the second converter transformer, 3.3 is the third converter transformer, 3.4 is the fourth converter transformer, 4 is the AC filter, 4.5 is the converter reactor, 5 is the VSC converter, 6 is the LCC converter , 7 is a stabilizing capacitor, 8 is a DC circuit breaker, 9 is a DC filter, 10 is a smoothing reactance, 11 is a starting power supply, and 12 is an uncontrolled rectification circuit.

[0023] figure 2 , 3 They are the basic control block diagrams of the VSC converter on the rectification side and the LCC converter on the inverter side, respectively. Among them, the VSC converter adopts the d-q decoupling direct current control method to determine the tran...

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Abstract

The invention relates to a topological structure of a hybrid direct-current power transmission system starting way and a staring method, in particular to a topological structure of a hybrid direct-current power transmission system based on an auxiliary power supply and a starting method. The topological structure is specific to a dual-end large power grid hybrid direct-current system; a VSC (Voltage Source Converter) is adopted on a rectifying side; an LCC converter is adopted on an inversion side; a starting power supply constructed by an uncontrolled rectifying device is connected in parallel to the middle of a direct-current circuit. The starting process of the system is completed by establishing direct-current voltage firstly by using a starting power supply. The topological structure has the advantages that 1, the problem of the lack of starting direct-current voltage can be solved effectively when the topological structure is applied to the starting process of a practical dual-end large power grid hybrid direct-current transmission system; 2, due to the adoption of the starting method, impacts of system voltage and current can be reduced effectively in a starting process, and the safety of power equipment is protected.

Description

[0001] technical field [0002] The invention relates to a topology structure and a startup method of a hybrid direct current transmission system starting mode, in particular to a topology structure and a startup method of a hybrid direct current transmission system based on an auxiliary power supply. Background technique [0003] In recent years, with the continuous development of high-voltage direct current transmission technology, based on the consideration of technical and economic factors, the hybrid direct current transmission system composed of LCC converter and VSC converter has a good application prospect. At present, the hybrid DC transmission system has outstanding cost-effective advantages in the fields of wind power grid connection, weak grid and passive network power supply, and power transmission to large cities and other load centers. The hybrid direct current transmission system will have a very broad application prospect. Due to the particularity of the hy...

Claims

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Application Information

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IPC IPC(8): H02J3/36H02M1/36
CPCY02E60/60
Inventor 刘开培秦亮杨洁陈灏泽
Owner WUHAN UNIV
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