ATESS, a pioneer in the energy storage industry, has introduced its latest breakthrough – the direct current coupling energy storage system.
In a new off-grid energy management advancement, ATESS’ direct current (DC) coupling energy storage system is tailored to enhance stability, reliability, and adaptability in challenging environments.
At the core of this novel DC coupling solution is the replacement of the bypass cabinet in ATESS’ original alternating coupling (AC) design with the rectifier cabinet (RTF).
The transformation redefines the state-switching logic of the grid and generator, eliminating AC-side switching and associated output fluctuations, thereby mitigating the risk of interruption of sensitive loads during the switching on the AC side.
A key benefit of ATESS’ DC coupling solution is the energy storage system serves as a buffer power source, ensuring seamless operation of the power system.
This solution is particularly well-suited for large off-grid systems with significant inductive loads or those dealing with unstable power grids and subpar generator performance, providing a 0 ms switchover time and offering unparalleled reliability.
As part of ATESS’ DC coupling solution, several components play crucial roles:
Solar Charge Controller: SCC is a modular maximum power point tracking (MPPT) controller featuring five independent MPPT modules, with each channel supporting 50kW and a single-unit power of up to 250 kW.
Multiple SCCs can be paralleled to increase photovoltaic (PV) access capacity, with the number of parallel SCCs theoretically unlimited, and ATESS determining the parallel solution based on project requirements.
Power Conversion Systems: Power Conversion Systems (PCS) is a bidirectional battery inverter with a single-unit power range from 100kW to 1000kW (100/250/500/630/1000kW). ATESS PCS can be paralleled to increase the system’s load capacity, with the current maximum supported parallel units being four.
RTF Rectifier: RTF is a modular rectifier, with each module providing 40kW. A single RTF unit can be configured with a maximum of 15 modules, reaching a power output of up to 600kW. RTFs can be paralleled to increase grid and generator rectifier power, and the number of RTFs in parallel is theoretically unlimited. ATESS determines the parallel solution based on the specific project requirements. It’s important to note that RTFs currently only support rectification and do not have an inverter function.
Automatic transfer switch: The ATESS automatic transfer switch (ATS) is used to switch between the grid and DG automatically. It supports simultaneous access to the grid and generator and has a single-unit power of 630kW or 1200kW. With a built-in bypass switch, in the event of system’s failure, it can seamlessly bypass the grid or generator to supply power directly to the load. The PCS operates consistently, unaffected by grid fluctuations, providing stable load operation without the need for frequent on-grid/off-grid switching.
In contrast to the original PCS+Bypass solution, where frequent grid fluctuations disrupted load stability, the DC coupling solution ensures that PCS output continues according to present parameters, regardless of grid fluctuations.
The PCS ensures stable load operation, unaffected by generator fluctuations. In the original PCS+Bypass systems, inconsistent generator performance often led to disruptions in system’s stability.
However, with the DC coupling solution, PCS operates independently of generator output fluctuations, allowing the RTF to regulate power smoothly even during sudden load changes. This independence enhances overall system reliability by ensuring stable load operation.
ATESS’ DC Coupling Energy Storage System navigates challenges with unparalleled resilience and adaptability.
In the scenario of unstable power grid, the DC coupling solution ensures PCS operates consistently in off-grid mode, impervious to grid fluctuations.
The company outlined that with grid fluctuations only affecting the output power of ATESS RTF, leaving PCS’s AC output untouched significantly enhanced the stability of load operation.
ATESS said that this scenario is particularly crucial in regions with unreliable grid infrastructure, providing a robust solution for maintaining continuous power supply despite external variations.
“While in the scenario of generator under poor performance, with PCS consistently in off-grid mode, the DC coupling solution remains unaffected by diesel generator output fluctuations,” ATESS outlined.
RTF’s incremental power control, after connecting to the diesel generator, ensures stable load operation, even during sudden heavy loads, and vastly improving system and load stability.
The system’s ability to adapt to poor generator performance positions it as a reliable solution in environments where diesel generators may be the primary power source.
ATESS views its DC coupling energy storage system as not just a product but as a game-changer that sets new standards for reliability, stability, and adaptability in off-grid energy management.
“Embrace the future of energy storage with ATESS – where innovation meets resilience,” the company said.
For more information, visit Atess’ website.
This article featured in the April edition of ecogeneration.
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