Droop networking secondary adjustment method and system for negative sequence signal extraction, medium and equipment
A secondary adjustment and signal extraction technology, applied in the direction of single-network parallel feeding arrangement, output power conversion device, electrical components, etc., can solve problems such as increasing system construction costs, reducing system stability, and increasing system complexity. Achieve the effect of good engineering practical value, saving construction cost, simple control and easy realization
Active Publication Date: 2021-04-06
STATE GRID SHAANXI ELECTRIC POWER RES INST +2
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This method requires a central controller and communication lines, which increases the construction cost of the system. At the same time, the use of communication lines will increase the complexity of the system, especially as the number of parallel units increases, it will reduce the stability of the system.
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[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. 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.
[0051] The invention provides a method for resetting the secondary regulation function of drooping networking of energy storage converters based on negative sequence current extraction. The negative-sequence current signal injected at the time of connection is used as the public event signal. Based on the principle of the event detection mechanism, the event signal of the negative-sequence current is used as the signal for the secondary adjustment ...
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The invention discloses a droop networking secondary adjustment method, system, medium and device for negative sequence signal extraction. The method comprises steps of collecting the load end current of an energy storage converter, extracting the amplitude of the negative sequence current of the load end of the energy storage converter based on a time domain algorithm, and obtaining the negative sequence current injected into a system by a new machine when the new machine is connected at the load end as a reset signal; based on the principle of an event detection mechanism, a reset signal is used as a signal for realizing secondary adjustment reset of an original energy storage converter, so uneven power distribution and damage to system stability caused by access of a new machine are avoided. The control method is simple, practical, convenient to improve, good in system expansibility and low in construction cost of the interconnection-line-free multi-machine parallel system, and has practical engineering application value.
Description
technical field [0001] The invention belongs to the technical field of energy storage converter control, and in particular relates to a method, system, medium and equipment for secondary regulation of drooping networking with negative sequence signal extraction. Background technique [0002] With the increasingly prominent energy problems, the research on new energy has developed rapidly. However, distributed power sources such as new energy sources have small power generation capacity and usually require parallel power supply. Energy storage converters are used as the carrier of distributed power sources, and their parallel control technology has become a research hotspot. [0003] Droop control is often used when energy storage converters are connected in parallel. When the energy storage converter works in the island mode, it loses the voltage and frequency support of the grid, and when the load changes suddenly, according to the droop characteristic, the amplitude and f...
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IPC IPC(8): H02J3/38H02M7/493
CPCH02J3/38H02M7/493
Inventor 王若谷王浩丞刘健易皓高欣王振雄刘树桦吕念孙宏丽吴子豪李广王辰曦
Owner STATE GRID SHAANXI ELECTRIC POWER RES INST