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Reactive power control method for low-voltage distribution transformer district with distributed photovoltaics

A distributed photovoltaic, low-voltage power distribution technology, applied in photovoltaic power generation, reactive power compensation, electrical components, etc., can solve the problem of many photovoltaic points, no access to low-voltage distributed photovoltaics, and the main station system cannot be independently controlled, etc. problem, to ensure the effect of reasonable scheduling

Active Publication Date: 2019-07-12
NARI TECH CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the distribution automation master station is not connected to low-voltage distributed photovoltaics, and cannot control photovoltaics
On the other hand, there are many low-voltage distributed photovoltaic points and a wide area, and the access to the main station system cannot be individually regulated

Method used

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  • Reactive power control method for low-voltage distribution transformer district with distributed photovoltaics
  • Reactive power control method for low-voltage distribution transformer district with distributed photovoltaics
  • Reactive power control method for low-voltage distribution transformer district with distributed photovoltaics

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Embodiment

[0061] Such as figure 1 As shown, it is a schematic diagram of the reactive power control system of the low-voltage distribution station area including distributed photovoltaics. The system includes distributed photovoltaic power sources, photovoltaic inverters, SVG, capacitors, and intelligent distribution transformer terminals deployed in the low-voltage distribution station area. equipment. The capacitor described in the present invention is an intelligent capacitor with a communication function, the SVG is used for reactive power compensation, and the photovoltaic inverter is used for power factor control. SVG and capacitors are connected to intelligent distribution transformer terminals through RS485 communication interface, and photovoltaic inverters in distributed power supply are connected to intelligent distribution transformer terminals through broadband power line carrier. The intelligent distribution transformer terminal is the control center of the system, which ...

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Abstract

The invention discloses a reactive power control method for a low-voltage power distribution transformer district with distributed photovoltaics. A distributed photovoltaic power supply, a photovoltaic inverter and a capacitor are arranged in the low-voltage power distribution transformer district. The reactive power control method comprises the following process of (S1) dividing a reactive powercontrol interval according to the voltage and power factor range of the transformer district, (S2) collecting low-voltage side voltage and power factors in the low-voltage power distribution transformer district, determining the reactive power control interval of a current transformer district according to the range of the voltage and the power factors and adjusting the reactive output of the photovoltaic inverter and the capacitor according to a control strategy corresponding to the reactive power control interval to achieve the reactive power adjustment of the low-voltage power distributiontransformer district. The operation interval of the transformer district is divided according to the voltage and power factors of the transformer district, the equipment such as a capacitor, an SVG and a photovoltaic inverter in the transformer district is controlled in real time according to a control strategy, and the reasonable scheduling of the transformer district voltage and power factors isensured.

Description

technical field [0001] The invention relates to an intelligent low-voltage distribution station area system, in particular to a reactive power control method for a low-voltage distribution station area containing distributed photovoltaics, and belongs to the field of power distribution technology. Background technique [0002] With the construction of new countryside, high-power electrical equipment is widely used in rural areas, and the clustering of large loads and non-linear loads in rural areas increases the burden on the distribution network with insufficient reactive power allocation. Therefore, strengthening the optimal configuration of reactive power compensation in low-voltage distribution network and maintaining reactive power balance has an important role and significance in ensuring power quality and reducing power grid loss. In the new phase of distribution station construction, low-voltage smart capacitors, SVG and other equipment are installed in the integrate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/50H02J3/48H02J3/38
CPCH02J3/383H02J3/24H02J3/50H02J3/48Y02E40/30
Inventor 陈娜蔡月明张强周强欧传刚张艺琼韩荟
Owner NARI TECH CO LTD
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