Black-start sequential control method for energy storage system
An energy storage system and black start technology, applied in energy storage, greenhouse gas reduction, climate sustainability, etc., can solve problems such as easy failure of black start, and achieve the effect of improving the success rate of black start
Active Publication Date: 2020-09-15
NR ELECTRIC CO LTD +2
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and provide a black-start sequence control method for energy storage systems in new energy applications, so as to solve the problem that black-start is prone to failure when the battery power is low
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[0037] The present invention will be further described below. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0038] The invention provides a black start sequence control method for an energy storage system. figure 1 It is a schematic diagram of the energy storage system structure of a new energy power station. There are n energy storage converters and m photovoltaic inverters. Among them, n≥2, m≥2. Photovoltaic inverters and energy storage converters are collected to the busbar through their respective collector lines, and finally connected to the external power grid or load through the outlet switch.
[0039] There is a coordinated control device in the station to coordinate and control its photovoltaic energy storage system. The device is capable of information interaction with energy storage converters and photovoltaic inverters, and its inf...
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The invention discloses a black-start sequential control method for an energy storage system in a new energy occasion. The method comprises a normal black-start mode and a low-electric-quantity black-start mode. Before black start, all converters of the energy storage system are traversed. When the state of charge (SOC) value of a battery connected with at least one converter in the energy storagesystem is greater than a threshold value, the normal black start mode is executed; and when the SOC of all the converters in the energy storage system is less than the threshold value, the low-electric-quantity black start mode is executed. According to the method, the starting sequence of the converters is selected preferentially, meanwhile, the photovoltaic inverter is started automatically inthe black-start process, the power of the photovoltaic inverter is limited, the energy storage system is assisted in building stable voltage and frequency, and thus the black-start success rate of theenergy storage system is increased.
Description
technical field [0001] The invention relates to the field of energy storage system control, in particular to a black start sequence control method for an energy storage system in a new energy field. Background technique [0002] In recent years, more and more off-grid new energy power generation systems have been applied to remote mountainous areas, areas without electricity, islands and other occasions. However, due to the strong volatility and randomness of the output power of photovoltaic and wind power, the instability of new energy power generation seriously restricts its power application. Energy storage technology can realize functions such as peak shaving and valley filling, frequency regulation and voltage regulation, and load fluctuation stabilization. Therefore, it has become an effective supporting technology to improve the reliability of off-grid new energy power generation systems. [0003] Compared with the large power grid, the energy storage system of the o...
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IPC IPC(8): H02J3/32
CPCH02J3/32Y02E70/30
Inventor 张兴李旭华新强蒋顺平丁勇刘为群石祥建
Owner NR ELECTRIC CO LTD