Battery energy storage system for peak load shifting and control method thereof

Abstract

The invention provides a battery energy storage system for peak load shifting and a control method thereof. The system comprises M energy storage modules, wherein M energy storage modules are mutually connected in parallel, each energy storage module comprises a battery pack and a bi-directional converter, the direct current end of the bi-directional converter is connected with the battery pack, the alternating current end of the bi-directional converter is connected with a power grid, and M is the integer greater than 1; and a monitoring module, wherein the monitoring module is respectively connected with the battery pack and bi-directional converter in each energy storage module, the monitoring module is used for obtaining the charging and discharging power demand curve and current stress optical coefficients (SOC) of M battery packs, and performing the start and stop control and power distribution to M energy storage modules according to the charging and discharging power demand curve, the current SOC of M battery packs and the power-efficiency curve of each energy storage module. The system is formed by connecting multiple energy storage modules in parallel, so the peak load shifting capacity is enhanced, the stability and safety of the power grid are obviously improved, and the redundancy and applicability of the system are improved.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a battery energy storage system for peak shaving and valley filling and a control method for the battery energy storage system for peak shaving and valley filling. Background technique [0002] With the development of society, the demand for electric energy continues to increase, and the concentration of electricity consumption is also increasing. This will cause insufficient power supply during the daytime and evening peaks, and the large power shortage will directly affect Due to the stability and security of the power grid, more and more places have to adopt extreme methods such as switching off and cutting power to ensure the stable operation of the power grid, but this also brings great inconvenience to people's lives and affects the industry. production, resulting in large economic losses. [0003] Under such circumstances, various forms of energy storage systems h...

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Problems solved by technology

[0004] In the related art, a control method for the battery energy storage system for peak shaving and valley filling of the distribution network is proposed, but it uses a single converter battery energy storage system, which is limited by the power and voltage level and can only It is used in low-power occasions and has a limited effect on grid compensation. At the same time, if a fault occurs, the system cannot continue to operate at all, and the reliability is low

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