Micro-grid black start control method and device, electronic equipment and storage medium

Abstract

The invention relates to the technical field of electric power, and provides a micro-grid black start control method and device, electronic equipment and a storage medium. An energy storage converter unit of the micro-grid is configured with a droop control mode. The black start control method of the micro-grid comprises the following steps: converting the control mode of the energy storage converter unit into the droop control mode; determining a target energy storage converter group according to the capacity required by black start; starting the target energy storage converter group, charging the power transmission line, and closing the load line; starting a partial load according to the capacity of the target energy storage converter group; and starting the non-black-start micro-sources in sequence, and starting the residual load according to the capacity of the target energy storage converter group and the capacity of the non-black-start micro-sources. According to the invention, in the black start process of the micro-grid, a plurality of energy storage converters can be started together to establish and maintain the voltage and frequency of the power grid, so that the on-load capacity and the on-load time are greatly improved, and the black start capability of the micro-grid is improved.

Description

technical field [0001] The present invention relates to the field of electric power technology, in particular to a control method, device, electronic equipment and storage medium for black start of a microgrid. Background technique [0002] Black start means that after the power system is out of service due to a fault, without relying on the help of the external network, through the start-up of the units with self-starting ability in the system, the units without self-starting ability are driven, and the recovery range of the power system is gradually expanded, and finally the entire power system is realized. Restoration of the power system. [0003] The traditional power system uses a rotating electrical power source, such as a synchronous generator, which has a large inertia. When a short circuit occurs in the power system, the short-circuit current rise rate is low, so it can provide sufficient reserve capacity and smoothly realize black start. [0004] In a microgrid, g...

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Problems solved by technology

These power supplies have a fast response speed, which is of great significance to quickly restore the power supply of important loads; but their system inertia is small, and their overload capacity is also poor, and impact loads and grid failures will have a great impact on the operation of grid-connected inverters. Influence, leading to the difficulty of black start of microgrid

[0005] In addition, in the conventional black start process of the microgrid, a single energy storage converter is used to build voltage and frequency, and the capacity of a single energy storage converter is limited, so it cannot be operated with a large load

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