Control method and device of flexible direct-current power transmission system
A power transmission system, flexible DC technology, applied to output power conversion devices, circuit devices, and AC power input to DC power output, etc., can solve problems such as immediate shutdown, low system energy availability, and system failure to recover.
Active Publication Date: 2020-07-31
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology
During the process of implementing the present invention, the inventors found that the prior art has at least the following technical problems: during the peak hours of power consumption, the flexible direct current transmission system is mostly running at full power, and once the phenomenon of redundancy exhaustion occurs, the system will immediately outage, which will cause a large energy loss
Moreover, when the reserve of spare parts is reduced but not enough to replenish redundant power modules, the system will not be able to recover and will be in a shutdown state for a long time, which leads to low energy availability of the system and further causes energy loss
Method used
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[0068] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0069] In the embodiment of the present invention, the flexible direct current transmission system includes a converter and a transformer, the converter includes six bridge arms, and the bridge arms include bridge arm reactors and multiple power modules; wherein, the AC power grid output After the alternating current is input through the transformer, it is converted into direct current through the converter and output.
[0070] see Figure 4 , is a schematic flowc...
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The invention relates to the technical field of flexible direct-current power transmission systems, and discloses a control method and device for a flexible direct-current power transmission system. The method comprises the steps: calculating the current forward ripple voltage limit value of a power module of a bridge arm when the number of faulted power modules in any bridge arm of a current converter is detected to be greater than a preset redundancy number threshold value; calculating the maximum active power limit value and the maximum reactive power limit value which can be absorbed by aflexible direct-current power transmission system according to the current forward ripple voltage limit value of the power module of the bridge arm and a preset power boundary condition; and controlling the output power of the flexible direct-current power transmission system according to the maximum active power limit value and the maximum reactive power limit value, so that the flexible direct-current power transmission system keeps running. According to the invention, when redundancy exhaustion occurs in a flexible direct current power transmission system, the flexible direct current powertransmission system can still be controlled to keep running, and the running keeping capability of the flexible direct current power transmission system is improved, so that the energy availability ofthe flexible direct current power transmission system is improved.
Description
technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a control method and device for a flexible direct current transmission system. Background technique [0002] Flexible DC transmission is a new generation of DC transmission technology. It has outstanding advantages such as no commutation failure, independent control of active and reactive power, dynamic and reactive power support, and black start. Therefore, it is widely used in intermittent new energy grids such as wind power, Scenarios such as island power transmission and asynchronous interconnection of large power grids. [0003] The flexible DC transmission system is mainly composed of converters and converter and transformer equipment; among them, because the modular multilevel converter (MMC, Modular Multilevel Converter) has a modular design, it does not require power devices to be connected in series and does not require AC-DC filtering. The...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H02J3/36H02M7/00H02M1/32
CPCH02J3/36H02J2003/365H02M1/32H02M7/00H02M1/0038H02M1/0067H02M1/325Y02E60/60
Inventor 周月宾饶宏许树楷陈俊杨柳
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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