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An island detection and stability control method for four-terminal DC distribution network

A stable control method and technology of DC distribution network, applied in the direction of AC network circuit, power transmission AC network, AC network load balancing, etc., can solve problems such as severe voltage fluctuations

Active Publication Date: 2020-09-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the method of using the difference of DC transformer and energy storage ratio parameters and the method of constant DC voltage reference value slope change solves the problem of drastic fluctuations in the voltage of the DC low-voltage side of the DC transformer during the switching process

Method used

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  • An island detection and stability control method for four-terminal DC distribution network
  • An island detection and stability control method for four-terminal DC distribution network
  • An island detection and stability control method for four-terminal DC distribution network

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with specific examples.

[0057] The islanding detection and stability control method of the four-terminal DC distribution network provided in this embodiment can be realized on the RTDS simulation platform, such as figure 1 As shown, the four-terminal DC distribution network includes a first AC grid ACgrid1, a second AC grid ACgrid2, a first AC circuit breaker ACCB1, a second AC circuit breaker ACCB2, a first DC circuit breaker DCCB1, a second DC circuit breaker DCCB2, third DCCB3, fourth DCCB4, fifth DCCB5, sixth DCCB6, seventh DCCB7, eighth DCCB8, first DC line L1, the second DC line L2, the third DC line L3, the first DC bus #1, the second DC bus #2, the third DC bus #3, the fourth DC bus #4, the fifth DC bus #5, The first AC bus #6, the second AC bus #7, the third AC bus #8, the first modular multilevel voltage source converter MMC-VSC1, the second modular multilevel voltage source converter MMC ...

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Abstract

The invention discloses an islanding detection and stability control method for a four-terminal DC distribution network, which includes the following steps: 1) main criterion for islanding detection based on switch state combination; 2) auxiliary criterion for islanding detection based on no-flow-pressure difference combination. According to; 3) Island stability control based on collaborative control of DC transformer and energy storage. The present invention combines the main criterion based on the switch state combination and the auxiliary criterion based on the no-current-pressure difference composite to detect the islanding of the four-terminal DC distribution network and designs it as an islanding detector; when the islanding detector detects After reaching the island, the control mode of T3's DC transformer and energy storage is switched to achieve stable control of the island, thereby maintaining the stable operation of the entire island power grid.

Description

technical field [0001] The invention relates to the technical field of DC distribution network, in particular to an island detection and stability control method for a four-terminal DC distribution network. Background technique [0002] Compared with the AC distribution network, the DC power distribution system has the ability to smoothly connect various distributed power sources on the spot, realize the closed-loop operation of multiple power sources, flexibly carry out bidirectional flow and control of active power, improve the power quality of the user side, A series of advantages such as isolating system failures. Therefore, the research of DC power distribution system has important social significance and broad application prospects. [0003] At present, the research on DC distribution network is still in its infancy, mainly focusing on the topology and control methods of DC distribution network, and there is little research on islanding detection and stability control...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/36H02J3/28H02J3/48
CPCH02J3/24H02J3/28H02J3/36H02J3/48H02J3/388H02J2203/20Y02E60/60H02J3/001
Inventor 宋伟伟张勇军
Owner SOUTH CHINA UNIV OF TECH
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