Energy storage system and control method thereof

An energy storage system and controller technology, applied in the direction of AC network load balancing, etc., can solve the problems of limited boosting capacity of boost converters, increase the total harmonic content of output current, and inapplicability, and achieve a wide range of applications, avoidance of Mutual interference and high utilization effect
CN101944745AInactive Publication Date: 2011-01-12BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2011-01-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides an energy storage system which comprises a controller, a main circuit, a push-pull converter, a cycloconverter, a filter inductor and a sampling circuit. The controller is used for controlling the generation of an SVPWM (Space Vector Pulse Width Modulation) signal and a PWM (Pulse Width Modulation) signal to obtain a discrete SVPWM signal, the main circuit comprises an energy storage device for storing and releasing electric energy, the push-pull converter comprises a high-frequency transformer and is boosted by adopting the high-frequency transformer to electrically isolate the input from the output of the energy storage system, the cycloconverter is used for converting a high-frequency alternating voltage into a power frequency alternating voltage, the filter inductor is used for filtering a grid current, and the sampling circuit is used for acquiring a voltage and a current of an external circuit. The energy storage system can generate discrete pulse-type SVPWM and has the advantages of higher utilization rate of the bus voltage, low total harmonic content and wide scope of application. The invention also provides a control method of the energy storage system.
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Description

technical field

[0001] The present invention relates to an energy storage system and a control method, in particular to an energy storage system and a control method for peak-shaving and valley-filling of a power grid. Background technique

[0002] With the development of power electronics technology, energy storage systems are used more and more widely, such as uninterruptible power supply (UPS), electric vehicles, and energy storage devices for power grid shaving and filling valleys. The energy storage device stores electric energy during low power consumption periods (charging), and releases electric energy to support the grid during peak power consumption periods (discharging). In order to achieve the effect of peak shaving and valley filling, the converter between the energy storage device and the grid must not only have two-way conversion capability, but also require a fast response to the conversion and a unit power factor of the system.

[0003] The patent "energy s...

Claims

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