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On-grid and off-grid control method and device based on parallel dual inverters

A dual-inverter, control method technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problem of unbalanced power consumption of parallel-connected dual-inverters

Active Publication Date: 2019-08-20
INNER MONGOLIA POWER GRP
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Problems solved by technology

[0005] The present invention aims to provide a parallel-connected double-inverter-based method and device for grid-connected and off-grid control, so as to improve the problem of unbalanced power consumption of parallel-connected double-inverters in the prior art

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  • On-grid and off-grid control method and device based on parallel dual inverters

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Embodiment Construction

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0035] Before explaining the specific embodiments of the present invention, the inventors of the present invention found that in the previous research and development ...

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Abstract

The invention provides an on-grid and off-grid control method and device based on parallel dual inverters. The method comprises the steps of calculating modified active power and reactive power of thefirst inverter and calculating modified reference active power and reactive power of the second inverter in the current on-grid period; calculating the current reactive power compensation value at the end of the current on-grid period; calculating modified reference reactive power and reference active power of the second inverter and carrying out power control on the second inverter in the current off-grid period; and calculating and adjusting the current reactive power compensation value at the end of the current off-grid period. The method provided by the invention can improve a problem ofunbalanced power consumption of the first inverter and the second inverter in the full working period at the on-grid and off-grid state.

Description

technical field [0001] The invention relates to the field of power control of inverters, in particular to a method and device for controlling grid connection and off-grid based on parallel double inverters. Background technique [0002] In recent years, with the rapid development of distributed generation (DG) technology of renewable energy such as solar energy, wind energy, and fuel cells, grid-connected inverters, as the key equipment for connecting distributed power sources to the public grid, have poor control performance. It directly affects the mass access and reliable operation of distributed energy. [0003] The existing technology "Improved Power Control Based on Parallel Dual Inverters and Grid-connected and Off-Grid Dual-mode Control Method" proposes a general structure for connecting distributed power sources to the grid, and proposes a corresponding coordinated control strategy. The distributed generation unit is connected to the Point of Common Coupling (PCC) ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/38H02J3/388
Inventor 韩俊飞何晋伟王宇强杨宝峰
Owner INNER MONGOLIA POWER GRP
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