Dispersion and centralization coordinated two-stage filtering implementation method applied to photovoltaic power station

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

Active Publication Date: 2018-11-06
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Dispersion and centralization coordinated two-stage filtering implementation method applied to photovoltaic power station
  • Dispersion and centralization coordinated two-stage filtering implementation method applied to photovoltaic power station
  • Dispersion and centralization coordinated two-stage filtering implementation method applied to photovoltaic power station

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Embodiment

[0022] See figure 1 , the photovoltaic power plant of the present invention includes three power generation areas. Two photovoltaic inverters and a split transformer with integrated filter reactance 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 step-up station after being converged by the 35kV converging line.

[0023] The primary filter station of the present invention is set at the integrated box-type transformer inside a single power generation area. Such as figure 2 As shown, the integrated filter reactance split transformer can be regarded as a three-phase five-winding transformer: one high-voltage winding and two low-voltage windings constitute a split transformer, and the remaining two windings are integrated with decoupled power supply windings. filter reactor. A single integrated filter reactor is composed of two sub-coils with the same number of turns in reverse se...

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Abstract

The invention discloses a dispersion and centralization coordinated two-stage filtering implementation method applied to a photovoltaic power station. Primary and secondary filtering stations formed by an integrated filtering box transformer and an inductive filtering grid-connected transformer are arranged in the photovoltaic power station. The primary power station is arranged in each box splittransformer in the power generation area, and the filtering reactor is integrated in the transformer so as to reduce the installing space. The secondary filtering station is arranged in the grid-connected booster station, and the grid-connected transformer uses the inductive filtering technology so as to perform damping to the phenomenon of harmonic resonance. The two-stage filtering stations arecoordinated with each other to suppress characteristic sub-harmonic so as to have the characteristics of dispersed harmonic filtering and centralized electric energy quality enhancement. The photovoltaic power station is simple in structure and convenient for integrated design, and the device parameters can be adjusted according to the actual demand so as to be applied to different scales of photovoltaic power stations.

Description

technical field [0001] The invention relates to the technical field of power quality control of photovoltaic power plants, in particular to a method for implementing a two-stage filter in which decentralized and centralized coordination is 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 plants use inverters as the interface between the photovoltaic array and the grid for AC and DC power conversion, and the inverter device emits 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-connected point . [0003] In order to meet the power quality requirements of photovoltaic power plants connected to the grid, the current common practice is to con...

Claims

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Application Information

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Patent Type & Authority Applications(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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