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Energy storage inverter, control method and device thereof and computer readable storage medium

A technology of energy storage inverter and control method, which is applied in the direction of converting irreversible DC power input into AC power output, wind power generation, AC network load balancing, etc., and can solve problems such as the uneven switching process of on-grid and off-grid, and achieve The effect of improving capacity utilization efficiency, preventing sudden changes, and improving dynamic response capability

Pending Publication Date: 2022-05-31
SEARI ELECTRIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Embodiments of the present application provide an energy storage inverter and its control method, device, and computer-readable storage medium, aiming to solve the problem of unsmooth switching process of on-grid and off-grid in the prior art

Method used

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  • Energy storage inverter, control method and device thereof and computer readable storage medium
  • Energy storage inverter, control method and device thereof and computer readable storage medium
  • Energy storage inverter, control method and device thereof and computer readable storage medium

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Embodiment Construction

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

[0061] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation shown in the drawings Or positional relationship is only for the convenience of describing the present application and simplifying...

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Abstract

The embodiment of the invention provides an energy storage inverter control method. The method comprises the steps of obtaining an output current of a pre-constructed virtual synchronous generator; acquiring a synchronous angular velocity of a power grid and a voltage value of a common coupling point, wherein the common coupling point is a coupling point of the power grid and the energy storage inverter; determining whether the synchronous angular velocity of the power grid and the voltage value of the common coupling point are in an allowable range; in response to determining that the synchronization angular velocity of the power grid and / or the voltage value of the common coupling point are / is not in an allowable range, inputting a power regulation instruction to the virtual synchronous generator so as to update the output current of the virtual synchronous generator; and determining instruction current according to the output current of the virtual synchronous generator, and updating the output state of the energy storage inverter according to the instruction current.

Description

technical field [0001] The present application relates to the technical field of grid-connected inverter control, and in particular to an energy storage inverter and its control method, device, and computer-readable storage medium. Background technique [0002] As a link between distributed power sources such as photovoltaic power and wind power and the grid, the grid-connected inverter is a power electronic device with almost no moment of inertia, so it is difficult to participate in grid regulation. Drawing on the operating experience of traditional power systems, the control strategy based on Virtual Synchronous Generator (VSG) is applied to the control of grid-connected inverters. VSG can increase the inertia of grid-connected inverters, but the commonly used control methods are greatly affected by feedback errors, making it difficult to achieve smooth switching between grid-connected and off-grid inverters, which may easily cause grid system instability. Contents of t...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/28H02M7/48
CPCH02J3/38H02J3/28H02M7/48Y02E10/76
Inventor 何大清
Owner SEARI ELECTRIC TECH
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