ENERGY STORAGE SYSTEM CONTROL METHOD AND APPARATUS, AND ENERGY STORAGE SYSTEM

WIPO Patent Application WO/2024/078198

A1

The present invention relates to the technical field of photovoltaics (PVs). Provided are an energy storage system control method and apparatus, and an energy storage system. The energy storage system control method in the present invention comprises: acquiring a PV voltage, a battery voltage and a voltage on line side, determining a bus voltage reference value according to the PV voltage, the battery voltage and the voltage on line side, and determining a reference phase shift angle or a reference frequency according to the bus voltage reference value; acquiring a battery-side current, and determining a bridge arm phase shift angle variation or a frequency variation according to a low-frequency component, which needs to be suppressed, of the battery-side current; determining a bridge arm phase shift angle according to the reference phase shift angle and the bridge arm phase shift angle variation, or determining a switching frequency according to the reference frequency and the frequency variation; and suppressing low-frequency ripple waves according to the bridge arm phase shift angle or the switching frequency. Low-frequency ripple waves are suppressed by means of phase shifting or frequency modulation, and the low-frequency ripple waves can then be suppressed, such that a PV is located at an MPPT point, thereby effectively avoiding PV derating operation.

ZHANG WENPING (CN)
WANG YIMING (CN)
XU PO (CN)
ZHOU DONG (CN)
CHENG KUN (CN)
JI JIANQIANG (CN)

PCT/CN2023/116939

April 18, 2024

September 05, 2023

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GINLONG TECH CO LTD (CN)

H02J3/32; H02J3/01; H02J3/28

TALENT PATENT & TRADEMARK FIRM et al. (CN)

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