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Multi-mode control photovoltaic grid-connected inverter based on intelligent distribution transformer terminal

An intelligent distribution transformer terminal and photovoltaic inverter technology, which is applied in the fields of electrical control and intelligent distribution transformer, can solve the problems of redundant connection wires, increased control complexity and incomplete function, and achieves increased convenience and rapidity. Smooth, promising effects

Active Publication Date: 2021-06-18
HEBEI UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when using the inverter's own acquisition circuit to collect grid-connected point information, when the grid-connected inverter is connected to the external expansion module or when multiple inverters are connected in parallel, the redundancy of the connecting wires will increase the complexity of the control.
Using one control strategy to realize filtering and reactive power compensation functions at the same time will cause incomplete function of a certain function

Method used

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  • Multi-mode control photovoltaic grid-connected inverter based on intelligent distribution transformer terminal
  • Multi-mode control photovoltaic grid-connected inverter based on intelligent distribution transformer terminal
  • Multi-mode control photovoltaic grid-connected inverter based on intelligent distribution transformer terminal

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Embodiment 1

[0090] A photovoltaic grid-connected inverter based on the multi-mode control of the intelligent distribution transformer terminal of the present invention will be described below with specific embodiments. In order to verify the effectiveness of the device, a multi-mode control photovoltaic grid-connected inverter simulation platform was built in Matlab / Simulink. The simulation model took three-phase 380V, 0 phase, and 50Hz as the grid side state, and set the switching frequency as 10KHz, DC Bus voltage U dc =800V, DC bus side capacitance C dc =2500μF, inverter side capacitance C f =600μF,L 1 = 500 μH. In order to verify the harmonic suppression and reactive power compensation capabilities of the invention, specific load harmonics and reactive power sources are simulated on the load side. This embodiment is a 10KW photovoltaic inverter, and high-order harmonics and reactive power are added to the simulation. By switching the operation modes of different functions, the ent...

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Abstract

The invention relates to a multi-mode control photovoltaic grid-connected inverter based on an intelligent distribution transformer terminal. The inverter comprises an intelligent distribution transformer terminal unit, an expansion power signal detection module, a photovoltaic inverter, a photovoltaic cell and a capacitor cell. The connection relation is that the intelligent distribution transformer terminal unit is connected with the extended power signal detection module, the extended power signal detection module is connected with the photovoltaic inverter, and the input side of the photovoltaic inverter is connected with the photovoltaic cell and the capacitor cell. The inverter is advantaged in that a problem that an existing device or method is insufficient in energy efficiency ratio can be solved, multifunctional mode conversion of the photovoltaic inverter is achieved, a line loss problem is effectively solved, the energy efficiency ratio of a power grid is obviously increased, and active supporting performance of a system is improved.

Description

technical field [0001] The invention belongs to the technical field of electrical control, in particular to a photovoltaic grid-connected inverter based on multi-mode control of an intelligent distribution transformer terminal, and belongs to the field of intelligent distribution transformers. Background technique [0002] In recent years, photovoltaic power generation technology has developed rapidly, and photovoltaic power generation has been recognized by more and more people. Due to the increasing number of power electronic devices used at the user end and the nonlinear, unbalanced, and reactive characteristics of local loads, the public connection The power quality of the point deteriorates. A large number of harmonics are injected into the power grid, which increases the interference of the power grid and reduces the power factor. [0003] The general photovoltaic grid-connected inverter has a single function, and additional filtering devices and reactive power compen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02J3/18H02J3/32H02J13/00
CPCH02J3/381H02J3/01H02J3/18H02J3/32H02J13/00002H02J13/00016H02J2203/20H02J2300/24H02J2300/26Y04S10/22Y04S10/14Y04S10/50Y04S10/123Y04S40/124Y02E70/30Y02E40/40Y02E40/30Y02E40/70Y02E60/00Y02E10/56
Inventor 李练兵刘艳杰范辉梁纪峰李佳祺李东颖周文李铁成罗蓬冯慧波
Owner HEBEI UNIV OF TECH
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