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Grid-connected and isolated island control method of single-phase parallel inverter

An island control and inverter technology, applied in the direction of single-grid parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve the problems of uneven power distribution, inverter circulating current, etc., to improve power quality and achieve zero stability The effect of state error regulation and suppression of power oscillation

Inactive Publication Date: 2018-06-05
张叡
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from master-slave control, there are problems of uneven power distribution and circulating current between inverters when multiple inverters adopt droop control at the same time

Method used

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  • Grid-connected and isolated island control method of single-phase parallel inverter
  • Grid-connected and isolated island control method of single-phase parallel inverter
  • Grid-connected and isolated island control method of single-phase parallel inverter

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Experimental program
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Embodiment Construction

[0016] specific implementation plan

[0017] figure 1 In , the output side of the inverter is connected with a second-order LC filter, and represents the complex impedance of the line, and represents the local load. A static switch is connected between the grid-connected inverter and the grid. During the normal operation of the grid, the static switch is closed, and the inverter works in the grid-connected mode; when the grid fails, the static switch is opened, and the inverter works in the island mode.

[0018] figure 2 Among them, when the single-phase inverter is in the grid-connected operation mode, the current closed-loop control strategy is mainly adopted. and represent the output voltage of inverter 1 and inverter 2, and represent the output impedance of inverter 1 and inverter 2, and represent the output current of inverter 1 and inverter 2, and represent the load voltage , impedance and current.

[0019] image 3 In the grid-connected operation, the inverter ad...

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Abstract

The invention discloses a grid-connected and isolated island control method of a single-phase parallel inverter. The grid-connected and isolated island control method comprises three parts including application of an inverter, grid-connected operation control and isolated island operation control. The grid-connected and isolated island control method adopts current closed-loop control during grid-connected operation, and realizes zero steady-state error adjustment by means of a quasi-PR regulator; the grid-connected and isolated island control method adopts droop control and combines virtual inductance to eliminate influence of inconsistent parameters of line impedance in an isolated island operation mode, and realizes the purposes of power sharing and circulating current restraining. Compared with the traditional extraction method, the grid-connected and isolated island control method adopting hybrid filter average power extraction can effectively suppress power oscillation and improve the electric energy quality of the system.

Description

Technical field [0001] The invention relates to a single-phase parallel inverter, in particular to a method for grid connection and islanding control of the single-phase parallel inverter. Background technique [0002] The energy crisis and environmental pollution have attracted widespread attention from all over the world, and research on renewable energy distributed generation systems is one of the main means to solve this problem. The output power of renewable energy is random and intermittent. It is a more effective way to combine it with energy storage devices, grid-connected interface converters and load units to form a microgrid, and to connect to the large power grid in the form of a microgrid. [0003] The voltage source type grid-connected inverter is usually used as the interface between the microgrid and the renewable energy generation unit, and mainly plays the role of energy conversion and power control. The control strategy of the grid-connected inverter is t...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/38H02J3/388
Inventor 张叡
Owner 张叡
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