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Distributed and centralized coordinated two-stage filter implementation method applied to photovoltaic power plants

A photovoltaic power station and two-stage filtering technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve problems such as harmonic amplification and unbalanced output of photovoltaic power stations, reduce compensation burden, simplify equipment operation management, reduce The effect of footprint

Active Publication Date: 2022-06-28
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the randomness and fluctuations of photovoltaic power generation, the passive filter is easy to match with the grid impedance, causing resonance and even harmonic amplification.
In addition, the output of photovoltaic power plants is not balanced within a day, resulting in a large margin for the reactive power compensation design capacity of the filter
At present, there is no cost-effective solution in the field of power quality management of photovoltaic power plants

Method used

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  • Distributed and centralized coordinated two-stage filter implementation method applied to photovoltaic power plants
  • Distributed and centralized coordinated two-stage filter implementation method applied to photovoltaic power plants
  • Distributed and centralized coordinated two-stage filter implementation method applied to photovoltaic power plants

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Embodiment

[0022] See figure 1 , the photovoltaic power station of the present invention includes three power generation areas. Two photovoltaic inverters and an integrated filter reactance split transformer form a power generation unit. 20 power generation units form a power generation area, and the output current is sent to the 110kV grid-connected booster station after the 35kV collection line is converged.

[0023] The primary filter station of the present invention is arranged at the integrated box-type transformer inside a single power generation area. like figure 2 As shown in the figure, the integrated filter reactance type split transformer can be regarded as a three-phase five-winding transformer: one high-voltage winding and two low-voltage windings form a split transformer, and the remaining two windings are integrated circuits that have been decoupled from other power supply windings. filter reactor. A single integrated filter reactor is made up of two sub-coils with eq...

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Abstract

The invention discloses a two-stage filter implementation method of decentralized and centralized coordination applied to a photovoltaic power station. The photovoltaic power station is provided with a primary and secondary filter station composed of an integrated filter box-type transformer and an induction filter grid-connected transformer; The first-level power station is set in each box-type split transformer inside the power generation area, and the filter reactor is integrated inside the transformer to reduce the installation space; the second-level filter station is set in the grid-connected step-up station, and the grid-connected transformer uses induction filtering technology to damp Harmonic resonance phenomenon; the two-stage filter stations coordinate with each other to suppress characteristic sub-harmonics, which has the characteristics of decentralized filtering of harmonics and centralized improvement of power quality. The photovoltaic power station has a simple structure and is convenient for integrated design, and device parameters can be adjusted according to actual needs, and can be applied to photovoltaic power stations of different scales.

Description

technical field [0001] The invention relates to the technical field of power quality management of photovoltaic power plants, in particular to a method for realizing decentralized and centralized coordinated two-stage filtering applied to photovoltaic power plants. Background technique [0002] With the maturity of new energy power generation technology, the penetration rate of photovoltaic power generation system output power in the power system continues to increase. Large-scale photovoltaic power stations use inverters as the interface for AC and DC power conversion between photovoltaic arrays and the grid, and the inverter device discharges a large amount of harmonics and reactive currents to the grid due to its inherent nonlinear characteristics, which seriously affects the power quality of the grid connection point. . [0003] In order to meet the power quality requirements of grid-connected photovoltaic power plants, the current practice is to connect passive filter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/38
CPCH02J3/383H02J3/01Y02A30/60
Inventor 刘乾易李勇帅智康罗隆福曹一家
Owner HUNAN UNIV
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