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Multi-functional grid-connected inverter and grid-connected inverter control method

A compound function and inverter technology, which can be applied in the direction of converting equipment that can be converted to DC without intermediate conversion, converting irreversible DC power input into AC power output, reactive power compensation, etc., can solve the problem of grid-connected inverters Rare, high DC bus voltage requirements and other issues, to achieve the effect of reducing investment costs and operation and maintenance costs, improving system reliability, and clear principles

Active Publication Date: 2012-02-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing grid-connected inverters with composite functions mainly adopt single-phase full-bridge or three-phase full-bridge power electronic topology, and their composite functions are mainly for harmonic current control, which can simultaneously control harmonics at the grid-connected point, There are not many grid-connected inverters with composite functions of reactive power and unbalanced current
In addition, the existing grid-connected inverters with composite functions often have high requirements on the DC bus voltage, requiring multiple DC power supply (photovoltaic cells, energy storage batteries, etc.) can only be connected to its DC bus

Method used

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  • Multi-functional grid-connected inverter and grid-connected inverter control method

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Effect test

Embodiment 1

[0080] The parameters of each phase for selecting the unbalanced load are: phase a is a 70Ω resistance load, phase b is a load of 40Ω resistance and 118uF capacitor in series, and phase c is a load of 50Ω resistance. Figure 9 It is given that when the nonlinear load switch S1 is disconnected and the unbalanced load switch S2 is closed, when the grid-connected inverter with the composite function is P=15kW and Q=0var, the grid-connected inverter before and after the composite function is put into use grid side current i sb and i sc experimental waveform, Figure 10 The corresponding grid-side active and reactive power experimental waveforms are given. From Figure 9 , Figure 10 It can be found that due to the existence of unbalanced and reactive loads, before the composite function grid-connected inverter is put into the compensation function, the three-phase grid-side current is obviously unbalanced, and the grid-side power is increased by 2 under the action of unbalance...

Embodiment 2

[0082] Select the non-linear load as the uncontrolled rectification load, and its DC load resistance is 50Ω. Still keep P=15kW, Q=0var, Figure 11 When the unbalanced composite switch S2 is disconnected and the nonlinear load switch S1 is closed, the grid-side voltage u before and after the composite function of the grid-connected inverter is put into use sa and grid side current i sa the experimental waveform, Figure 12 The corresponding grid-side active and reactive power experimental waveforms are given. From Figure 11 and Figure 12 It is not difficult to find that: since the nonlinear load is an uncontrolled rectification load with resistance on the DC side, before the composite function of the grid-connected inverter is put into use, the grid-side current is the sum of the nonlinear load current and the output current of the grid-connected inverter Superposition, under the action of nonlinear load current, it presents a large harmonic distortion. At the same time...

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Abstract

The invention belongs to the field of electrical engineering, distributed power generation and power quality control, and aims to provide a multi-functional grid-connected inverter and a grid-connected inverter control method. The grid-connected inverter comprises a direct-current bus bar with a capacitor and three sets of single-phase full-bridge inverter circuits sharing the direct-current bus bar, the direct-current output ends of a distributed power supply or a grid-connected energy-storing generating set are connected to both ends of the capacitor of the direct-current bus bar, the output of each set of single-phase full-bridge inverter circuit is connected to a filter, and the output ends of each filter are connected with a distribution network of the 380V voltage class through a single-phase step-up isolation transformer. According to the invention, the grid-connected inverter equipment is effectively utilized to carry out effective control on the power quality of points of interconnection, so that the grid-connected inverter is multi-purpose and multi-functional, the cost performance of the grid-connected inverter is enhanced, the investment, operation and maintenance cost of a system can be reduced, and the reliability of the system can be enhanced. The principle of the provided control scheme is clear, and the control scheme is highly operable and reliable in operation.

Description

technical field [0001] The invention relates to a grid-connected inverter with compound functions and a grid-connected inverter control method, belonging to the fields of electrical engineering, distributed power generation and power quality control. Background technique [0002] Since the distributed generation system is not only an important link for renewable energy to connect to the grid, but also can improve the stability of the traditional grid to a certain extent, it has received more and more attention. Due to the intermittent and random characteristics of wind energy, photovoltaic and other renewable energy sources, they are typical uncontrollable sources. How to better connect uncontrollable renewable energy to the grid has been a research hotspot for a long time. In order to solve this problem, some scholars put forward the concept of microgrid. As a local power supply system integrating multiple renewable energy sources, energy storage and loads, microgrid has ...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M5/10H02J3/38H02J3/18H02J3/01
CPCY02E10/56Y02E40/30Y02E40/40
Inventor 杨欢曾正赵荣祥朱明磊汤浩金磊
Owner ZHEJIANG UNIV
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