Abstract
The cascaded energy storage system has received extensive attention in areas such as new energy consumption, maintaining stable operation of the power grid, and supporting black start due to its advantages such as high access voltage level, large single unit capacity, and fast dynamic response rate. This paper aimed to improve the fault ride-through capability of the cascaded energy storage system, and proposed a fault ride-through control method. Firstly, the mathematical model of the cascaded energy storage system was established, and then the rapid detection method of the abnormal state of the power grid and the fault ride-through method were analyzed, and finally the simulation analysis was performed. The feasibility and correctness of the control method can be seen from the experiments.
Highlights
Energy is an important factor for the survival and development of human beings
The above-mentioned requirements are all eagerly hoped that the battery energy storage systems could develop towards higher voltage level and larger single machine capacity [3]
At 0.6s, voltage unbalance fault occurs in the power grid, the system quickly switches to the fault ride-through control state, and the output active power is continuously maintained at 5MW without fluctuations
Summary
The continuous increase in population and the continuous development of social economy require a large amount of energy as a driving force [1]. While it has brought huge convenience and benefits to mankind, it caused many problems, such as energy shortages and fossil energy pollution problems. The cascaded energy storage system has high conversion efficiency, fewer control levels, and rapid dispatch response, which is more in line with the construction needs of large-capacity energy storage power stations [4]. The multilevel converter technology suitable for 10kV voltage level and above is mainly divided into two types: Cascaded H-bridge converter battery energy storage system (CHBC-BESS) and modular multilevel converter battery energy storage system (MMC-BESS). Output power and current control method under the grid fault state and fast grid voltage amplitude phase angle lock method are purposed to improve the fault ride-through capability of the cascaded energy storage system
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