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A power control method for a faulty process of a flexible direct current power grid system

A power grid system, flexible DC technology, applied in the direction of power transmission AC network, etc., can solve problems such as input and output power imbalance, system instability, etc., to achieve the effect of reducing active power loss, ensuring power balance, and achieving stable operation

Active Publication Date: 2019-01-11
XJ ELECTRIC +2
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Problems solved by technology

[0005] The purpose of the present invention is to provide a power control method when the receiving end of the flexible DC power grid system fails, so as to solve the problem in the prior art that the input and output power imbalance causes the system to be unstable when the receiving end fails

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  • A power control method for a faulty process of a flexible direct current power grid system
  • A power control method for a faulty process of a flexible direct current power grid system

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the drawings.

[0017] The flexible DC grid system needs to coordinate and control the power when the end fails. The flexible DC grid system refers to at least three-terminal flexible DC converter stations, each converter station adopts a bipolar structure, and each pole is equipped with a converter (such as setting A converter), each pole has control modes such as DC voltage, active power, reactive power, and AC voltage. Each converter station is connected to other converter stations through meshed DC lines, such as figure 1 As shown, it includes N sending-end stations and N receiving-end stations. In the figure, PI_rc11 is the redundant capacity of the sending-end station 1 pole 1, PI_re11 is the actual power of the sending-end station 1 pole 1; PI_rcN1 is the sending-end station N pole The redundancy capacity of 1, PI_reN1 is the actual power of the N pole 1 of the sending end station; PR...

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Abstract

The invention relates to the field of flexible direct current transmission, in particular to a power control method for a faulty process of a flexible direct current power grid system. By collecting the active power reference value of each pole of the converter station, the measured value and the operation mode of each converter, the total redundancy capacity of the receiver converter is calculated, When a fault occurs in the receiving converter, the difference between the total redundant capacity of the receiving converter and the capacity of the faulty converter is judged. If the differenceis positive, only the control mode is switched. If the difference is negative, the total power of the sending converter station of the fault pole layer is reduced to the maximum transportable capacityof the other receiving converters of the fault pole layer. At that same time, the power of each perfect pole is distributed actively, the power balance of the direct current system is ensured, and the stable operation of the system is realized. The invention can meet the requirements of the stable operation of the flexible direct current network system through the mean of active power regulation.

Description

Technical field [0001] The invention relates to the field of flexible direct current transmission, in particular to a power control method when the receiving end of a flexible direct current grid system fails. Background technique [0002] The flexible DC transmission adopts a voltage source converter (VSC, Voltage Source Converter), which generally uses fully controlled power electronic devices (insulated gate bipolar transistor IGBT), which can independently and quickly control active power and reactive power. Flexible direct current transmission has the advantages of being able to realize the interconnection of non-synchronous systems, there is no stability problem of alternating current 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, unlike conventional DC using semi-controlled devices (thyristors) and ...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 张群郝俊芳赵倩严兵靳巩磊于海刘威鹏王瑶艾红杰王秋开
Owner XJ ELECTRIC
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