A grid-connected control method and device for multi-machine parallel virtual synchronous inverters

Abstract

The invention discloses a grid-connected control method for multi-machine parallel virtual synchronous inverters. When each virtual synchronous inverter is connected in parallel to the main power grid, the obtained phase angle compensation amount and angular frequency synchronous compensation amount are used to facilitate The synchronization of each virtual synchronous inverter with the voltage of the main grid can be realized. In addition, the current virtual inertia of each virtual synchronous inverter is adjusted to the target virtual inertia by using the equivalent reactance and the maximum angular frequency compensation between each virtual synchronous inverter and the main grid, so as to suppress the The purpose of power oscillation between the generator and the main grid. Therefore, with this scheme, when each virtual synchronous inverter is integrated into the main grid, it not only ensures the synchronization between the output voltage of each virtual synchronous inverter and the voltage of the main grid, but also avoids that each virtual synchronous inverter cannot be incorporated The power oscillation problem caused by the main grid. In addition, the invention discloses a grid-connected control device for multi-machine parallel virtual synchronous inverters, which has the above effects.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a grid-connected control method and device for multi-machine parallel virtual synchronous inverters. Background technique [0002] Distributed energy technology is an important development direction of future energy technology, which has the advantages of high energy utilization efficiency and small negative impact on the environment. Distributed energy is an energy supply method built on the user side, which can be operated independently or connected to the grid. It is a system that maximizes resources and environmental benefits to determine the mode and capacity, and integrates and optimizes the user's various energy needs and resource allocation conditions. [0003] Inverter-based grid-connection technology is one of the important research contents of distributed energy technology application. Distributed energy is generally connected to the grid through the inverter inte...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a grid-connected control method and device for multi-machine parallel virtual synchronous inverters, so that when multiple virtual synchronous At the same time of voltage synchronization, it solves the problem of power oscillation caused by multiple virtual synchronous inverters connected to the grid

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