Table 1. Simulation parameters. Among them, the rated voltage of the power grid is 10 kV and the frequency is 50 Hz. The HVAC part of the energy storage PCS system contains 15 modules in each phase, with a three-phase Y-connection.
PCS energy storage converter is like a power housekeeper, it can flexibly switch between two working modes, on-grid mode and off-grid mode, to meet your various needs. It acts as a bridge between the battery and the power grid, allowing for a seamless flow of energy in both directions.
Beyond the standard active power regulation capability, PCS energy storage on both the new energy and grid sides typically require additional functionalities. These include inertia support, primary frequency modulation active power support, and reactive power regulation.
Large-scale energy storage is favorable currently. The capacity expansion needs to be realized by the parallel connection of multiple low-voltage small-capacity PCSs and connected to a medium- or high-voltage power grid through the transformer. The connection would lead to the problems of low efficiency, high cost and unnecessary land occupation.
PCS energy storage come in two main categories: single-phase and three-phase. Single-phase PCS are typically used in smaller applications, while three-phase PCS are employed in larger, more demanding systems.
The rated capacity of each module is 23.8 kW, and the rated through current is about 34 A, with a sufficient through current margin. Figure 15. PCS prototype. First, the power feedback test is carried out for two groups of modules (H-bridge and a DAB), in which the AC side and DC side are connected in parallel.
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