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Power control method and system for multi-converter stations in multi-terminal active flexible DC system

A flexible DC and power control technology, applied in the direction of AC network circuits, power transmission AC networks, electrical components, etc., to achieve the effect of realizing DC voltage, ensuring power balance, and reducing active power loss

Active Publication Date: 2020-04-14
XJ ELECTRIC +2
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a power control method and system for multiple converter stations of a multi-terminal active flexible DC system, which is used to solve the problem of stable operation of the system when the sending end of the multi-terminal flexible DC system fails

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  • Power control method and system for multi-converter stations in multi-terminal active flexible DC system
  • Power control method and system for multi-converter stations in multi-terminal active flexible DC system

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] A multi-terminal active flexible DC system refers to at least including three-terminal flexible DC converter stations. Each terminal adopts a bipolar structure, and each pole has control modes such as DC voltage, active power, reactive power, and AC voltage.

[0021] Based on the four-terminal active flexible direct current system, the present invention provides a power control system for multi-terminal active flexible direct current system with multiple converter stations, and its structural diagram is as follows figure 1As shown, it includes four-terminal flexible DC converter stations, which are respectively denoted as station A, station B, station C and station D. The converter stations at each end adopt a bipolar structure, and ...

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Abstract

The invention relates to a multi-terminal active flexible direct current system multi-converter station power control method and system. The control method comprises the steps of calculating active power transferring amount in real time according to an actual active power reference value and an operation mode of all ends of a converter station, reallocating the power of fault station and the powerof the non-fault station according to the active power transferring amount and the capacity of the converter station at each end base on the principle that the active power of the power receiving station remains the same. According to the invention, when a sending end converter in a four-end active flexible direct current system breaks down, the active power of each pole of the convertor stationis reallocated through the active power reference value and the active power capacity of each end, thereby realizing all or part of the power transferring of a fault pole. The active power loss is reduced, the power balance of a direct-current system is guaranteed, and the direct-current voltage is stabilized.

Description

technical field [0001] The invention relates to a power control method and system for multi-converter stations of a multi-terminal active flexible direct current system, belonging to the technical field of flexible direct current transmission. Background technique [0002] Flexible DC transmission uses a voltage source converter (VSC, Voltage Source Converter), and generally uses a fully-controlled power electronic device (insulated gate bipolar transistor IGBT) to independently and quickly control active power and reactive power. Flexible DC has the advantages of being able to realize the interconnection of asynchronous systems, there is no stability problem of AC transmission, and the active and reactive power can be controlled by the control system. In addition, based on its two basic characteristics of using fully-controlled devices (IGBT) and high-frequency modulation technology, it is different from conventional DC using half-controlled devices (thyristors) and low-fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/48H02J3/36
CPCH02J3/0073H02J3/36H02J3/48Y02E60/60
Inventor 张群郝俊芳赵倩严兵宋延涛王瑶田培涛陈朋王圣光荆益博
Owner XJ ELECTRIC
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