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TCT type low-voltage static var compensator for roof photovoltaic power generation

A static reactive power compensation and photovoltaic power generation technology, applied in photovoltaic power generation, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as voltage fluctuations in rooftop photovoltaic power plants, achieve system resonance elimination, and fast response , the effect of suppressing the voltage rise

Pending Publication Date: 2020-04-17
DATANG SHANDONG CLEAN ENERGY DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of voltage fluctuation, power factor and resonance overvoltage in the rooftop photovoltaic power station. The present invention provides a TCT type static var compensation device

Method used

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  • TCT type low-voltage static var compensator for roof photovoltaic power generation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A TCT-type low-voltage static var compensation device for roof photovoltaic power generation, said TCT-type low-voltage static var compensation device for roof photovoltaic power generation includes a TCT branch circuit with continuously adjustable output inductive reactive power arranged on the 400KV side, For the two TSC branches that output capacitive reactive power and the control and protection system, the TSC branch is used for graded coarse adjustment, and the TCT branch is used for phase control fine adjustment. The capacity of the TCT branch is 1 / of the capacity of the TSC branch 41 / 3;

[0020] The sampling point of this device comes from the voltage transformer and current transformer set at the 10kV common connection point on the input side of the transmission line. Resonance, at this time, the capacity of TCT reaches the maximum, and the voltage rise is suppressed;

[0021] The TCT branch and the two TSC branches are equipped with current transformers to m...

Embodiment 2

[0024] According to the TCT type low-voltage static var compensation device for rooftop photovoltaic power generation described in Embodiment 1, the voltage transformer and current transformer at the 10KV of the transmission line are power factor sampling points, and the incoming line transformer is compensated at light load and the excitation reactive power of the photovoltaic isolation transformer itself.

Embodiment 3

[0026] According to the TCT low-voltage static var compensator for rooftop photovoltaic power generation described in Embodiment 1 or 2, the TSC branch is a thyristor switching capacitor.

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Abstract

The invention discloses a TCT type low-voltage static var compensator for roof photovoltaic power generation. Photovoltaic power generation is clean energy, the investment cost of photovoltaic per kilowatt is continuously reduced, and energy consumption of enterprises is reduced through a roof photovoltaic power station. The composition of the invention comprises: a component A and a component B,the TCT type low-voltage static reactive power compensation device for roof photovoltaic power generation comprises a TCT branch which is arranged on the 400KV side and outputs continuously adjustableinductive reactive power and two TSC branches which output capacitive reactive power. A TSC branch circuit is used for grading coarse adjustment, a TCT branch circuit is used for phase control fine adjustment, the capacity of the TCT branch circuit is 1 / 4 of that of the TSC branch circuit, the TCT branch circuit is a magnetic integrated thyristor control transformer, and the secondary winding ofthe transformer is connected with a reactor winding in series and then connected with a thyristor. The TCT type low-voltage static var compensator is used for roof photovoltaic power generation TCT type low-voltage static var compensation.

Description

Technical field: [0001] The invention relates to a TCT-type low-voltage static var compensator for rooftop photovoltaic power generation, especially in the rooftop photovoltaic power generation mode of enterprises that generate and use their own surplus electricity on the grid. Background technique: [0002] Photovoltaic power generation is clean energy, and the investment cost per kilowatt of photovoltaics continues to decline. Rooftop photovoltaic power plants can reduce energy consumption of enterprises. [0003] The connection of photovoltaic power generation to the distribution network has a certain effect on the voltage increase, but also brings other problems, such as the reduction of the power factor of the enterprise, the interest rate adjustment of electricity charges, the harmonic problem caused by the inverter, and the harmonic amplification problem of the capacitor bank , Transient overvoltage problems during power switching, etc. The reliable operation of roof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/18H02J3/38
CPCH02J3/16H02J3/1821H02J3/1835Y02B10/10Y02E10/56Y02E40/30Y02P80/20
Inventor 侯干于振振谢春生付大志门海龙于垂右
Owner DATANG SHANDONG CLEAN ENERGY DEV