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Power Plant Control with Configurable Reserves for Grid-Forming Solar Power Plants with Hybrid Storage

Abstract:

The number of photovoltaic (PV) solar power plants installed has greatly increased in the last decades. They should be equipped with additional energy storage to be able to provide grid services and to operate isolated from the main grid. In this context, hybrid energy storage systems (HESSs) are a promising solution since they are an economic option to increase the flexibility of PV power plants. However, in these applications, HESSs should be adequately managed in order to maximise their performance and expand their lifetime. In this paper, a central controller for a PV solar power plant with hybrid storage is proposed. With this controller, the power plant can be operated isolated from the main grid and therefore help in the system restoration. It optimises the HESS performance by coordinating the storage technologies according to their state of charge and the operational constraints. Moreover, it allows to configure the power reserves in each of the storage units. The main contributions are verified in a test case consisting of two PV inverters that operate in grid-following mode and a HESS based on a Li-Ion battery and a redox-flow battery. This HESS is operated in grid-forming mode and controls the power plant voltage during islanded operation. The simulations are performed in Matlab/Simulink.