Energy storage system and transient power control method thereof
A technology of energy storage system and control method, which can be applied to DC circuits to reduce harmonics/ripples, parallel operation of DC power supplies, electric vehicles, etc., to reduce the risk of system collapse and improve the response speed.
Pending Publication Date: 2022-03-25
SHENZHEN POWER SUPPLY BUREAU
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[0004] Based on this, it is necessary to provide an energy storage system and its transient power control method for the above problems of capacitor configuration and response speed of the energy storage converter
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[0032] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.
[0034] It can be understood that the terms "first", "second" and the like used in this application may be used to describe various elements herein, but these elements are not limited by these terms. ...
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The invention relates to an energy storage system, which comprises an external capacitor module, a feed-forward control module and more than two energy storage converters, and is characterized in that the external capacitor module performs active discharge when the voltage of a direct current bus drops, and then the feed-forward control module collects the discharge current of the external capacitor module; according to the system, the direct-current bus side of each energy storage converter is subjected to external processing, a feed-forward control signal is output to each energy storage converter according to the discharge current, and each energy storage converter adjusts the output current through a current control ring according to the feed-forward control signal, so that the voltage of the direct-current bus is recovered to a stable state. The size of the filter capacitor can be flexibly configured according to ripple requirements of different energy storage systems, the problem of inconvenient maintenance caused by capacity mismatching since the capacitor is arranged in the energy storage converter is avoided, a feedforward control signal directly acts on a current control ring of the energy storage converter, the response speed of the energy storage converter is increased, and the energy storage converter is more stable in operation. And the risk of system crash caused by short-time power imbalance of the system is reduced.
Description
technical field [0001] The present application relates to the field of transient power control, in particular to an energy storage system and a transient power control method thereof. Background technique [0002] With the development of power technology and the application of distributed energy, the advantages of low-voltage DC power supply and distribution are gradually emerging. In traditional DC power supply and distribution energy storage systems, the DC bus side of the energy storage converter is equipped with capacitors, which are used to discharge immediately to maintain the normal operation of the system when the power on the DC bus side suddenly increases and the voltage drops suddenly, waiting for the storage After the energy converter responds, it enters a steady state. [0003] The above transient response process has high requirements on the equivalent capacitance and response speed of the DC bus side of the energy storage converter. However, the current ener...
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IPC IPC(8): H02J7/00H02J7/34H02J1/00H02J1/02H02J1/10
CPCH02J7/0013H02J7/0063H02J7/345H02J1/00H02J1/10H02J1/02
Inventor 赵宇明谢宏李艳吕志宁余鹏王静刘国伟陈鑫
Owner SHENZHEN POWER SUPPLY BUREAU