Method for realizing power distribution network closed loop and photovoltaic concentrated access by adopting flexible DC (direct current) power transmission

A flexible DC power transmission and flexible DC technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., can solve the problem of low utilization rate, and achieve the effect of low total cost, high reliability, and comprehensive investment reduction.

Active Publication Date: 2015-12-30
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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Problems solved by technology

Yang Xiaodong and others proposed a closed-loop structure suitable for my country's 10 kV power grid in the patent "A High-Reliability Closed-Loop Wiring Structure of Medium-Voltage Distribution Network", that is, two circuits are fed out from the low-voltage side of a single main transformer in a substation. Form a close

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  • Method for realizing power distribution network closed loop and photovoltaic concentrated access by adopting flexible DC (direct current) power transmission
  • Method for realizing power distribution network closed loop and photovoltaic concentrated access by adopting flexible DC (direct current) power transmission
  • Method for realizing power distribution network closed loop and photovoltaic concentrated access by adopting flexible DC (direct current) power transmission

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[0040] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0041] The invention provides a method for realizing closed-loop distribution network and centralized photovoltaic access by using flexible direct current transmission.

[0042] Such as figure 1 As shown, follow the steps below to achieve:

[0043] Step S11: lead out the first feeder and the second feeder from the 10 kV side of the first main transformer of a substation, and lead out the third feeder and the fourth feeder from the 10 kV side of the second main transformer of another substation;

[0044] Step S12: Correspondingly connecting the first feeder, the second feeder, the third feeder and the fourth feeder to the first flexible DC converter in a flexible DC power transmission system through the connecting unit. The AC bus bar, the second AC bus bar of the first flexible DC converter, the first AC bus bar of the second flexible D...

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Abstract

The invention relates to a method for realizing power distribution network closed loop and photovoltaic concentrated access by adopting flexible DC (direct current) power transmission. Two feeder lines are led out from each of two main transformers respectively and correspondingly; the four feeder lines are correspondingly connected to AC (alternating current) buses through connecting units respectively; in a flexible DC power transmission system, DC buses connected with DC boost ends of photovoltaic power generation modules are correspondingly arranged on two sides of a DC power transmission loop; during normal operation, the load, supplied by transformer substations, of the four feeder lines is smaller than or equal to 75% of the thermal stability limit power of a single feeder line, flexible DC converters in the flexible DC power transmission system operate as inverters, and the electric power sent out by the photovoltaic power generation modules are transmitted to 10 kilovolt feeder lines. According to the method, the power distribution reliability is high, the transformation is small, the comprehensive investment in inverters is reduced, and the method is suitable for an occasion with high requirement for power distribution reliability and needing grid connection of photovoltaic power stations.

Description

technical field [0001] The invention relates to the field of power supply technology and grid connection of photovoltaic power sources, in particular to a method for realizing closed-loop distribution network and centralized access of photovoltaics by using flexible direct current transmission. Background technique [0002] The medium-voltage distribution network in high-reliability power supply areas at home and abroad generally adopts a ring network structure, and its specific operation mode is divided into two types: open-loop operation and closed-loop operation. my country's medium-voltage 10 kV distribution network adopts the "open-loop operation + distribution automation" method, that is, the contact switch between each 10 kV feeder is opened during normal operation, and the 10 kV feeder uses radiation power supply; when the feeder fails, Fault location and isolation are implemented through the distribution automation system, and the contact switch is closed to realize ...

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 杨晓东胡臻达叶荣林章岁
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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