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An inverter station topology structure suitable for high voltage and large capacity traditional HVDC project receiving end transformation and a control method thereof

A technology of topology structure and DC engineering, applied in the direction of irreversible DC power input conversion to AC power output, power transmission AC network, output power conversion device, etc., can solve the problem that the inverter station cannot operate at the specified working point , DC voltage and DC current cannot be balanced, etc.

Inactive Publication Date: 2018-12-28
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0009] Among them, method (2) needs to select multiple locations to build inverter stations, which is mainly used for newly-built hybrid high-voltage direct current transmission projects, and is not applicable when transforming existing projects; when using method (1), due to the The units all use their own independent controllers, which is very likely to cause the DC voltage and DC current between the various converter units to be unbalanced or interact with each other to cause oscillation, so that the entire inverter station cannot operate at the specified operating point.
However, there are few literatures on this issue

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  • An inverter station topology structure suitable for high voltage and large capacity traditional HVDC project receiving end transformation and a control method thereof
  • An inverter station topology structure suitable for high voltage and large capacity traditional HVDC project receiving end transformation and a control method thereof
  • An inverter station topology structure suitable for high voltage and large capacity traditional HVDC project receiving end transformation and a control method thereof

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Embodiment Construction

[0029] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] The inverter station topology of the present invention is as follows figure 1 As shown, single-pole ground connection is adopted, including smoothing reactor, three-phase AC busbar and MMC array. The MMC array is composed of M×K MMC commutation units connected, which corresponds to M rows and K columns. Each column in the MMC array contains M MMC converter units and these MMC converter units are sequentially cascaded through the DC side to form a high-voltage terminal and a low-voltage terminal. The high-voltage terminals of K columns are connected together as the positive pole of the MMC array, and the low-voltage terminals of K columns are connected together as the negative pole of the MMC array. Grounding; each row in the MMC array contains K MM...

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Abstract

The invention discloses a inverter station topology structure suitable for high voltage and large capacity traditional HVDC project receiving end transformation and a control method thereof. The inverter station topology can be flexibly applied to the receiving end transformation of HVDC transmission projects with various voltage levels and transmission capacities, so that the voltage and power ofthe inverter can be matched with the original project, and the balance of DC voltage and DC current can be maintained between the inverter units during the steady-state operation of the inverter station. The control mode of the invention is the control mode control of each MMC converter unit, and the power balance between the converter units can be realized without adding an additional controller.

Description

technical field [0001] The invention belongs to the technical field of power electronic systems, and in particular relates to an inverter station topology structure and a control method suitable for the transformation of the receiving end of a high-voltage and large-capacity traditional DC project. Background technique [0002] High Voltage Direct Current (HVDC) is widely used in long-distance large-capacity transmission projects in my country due to its low cost of transmission lines, no increase in the short-circuit capacity of the AC system, small occupied transmission corridors, and low losses. [0003] Two-terminal DC transmission systems can be divided into two types according to different commutation technologies: thyristor-based traditional DC transmission (LCC-HVDC) and IGBT-based flexible DC transmission (VSC-HVDC). Due to its low cost and good performance, the LCC-HVDC system has been widely used in large-capacity long-distance power transmission and back-to-back ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02M7/48
CPCH02J3/36H02M7/48H02M1/0067H02M1/007Y02E60/60
Inventor 陆翌李继红裘鹏徐政徐雨哲肖晃庆
Owner STATE GRID CORP OF CHINA
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