Battery Energy Storage System (BESS)

The Next Generation Energy Storage System


Battery Energy Storage Systems (BESS) built on state-of-the-art-technology are modular solutions in terms of output power and energy. Variety of operation modes and flexibility to connect to any voltage level, makes Merus BESS a preferred solution for complete electricity system value chain starting from the generation. Particularly renewable energy integration, and from Transmission and Distribution (T&D) down to hybrid, island and microgrids. Built-in flexible design permits easy scalability to deliver customized solution from few hundreds of kWh to several hundred MWh. Typical operation modes of Merus BESS include but not limited to are: frequency & voltage regulation, peak shaving and intermittent power support including unique power quality modes.

In the micro grid applications, the core of BESS is the modern Merus MCC Micro Grid Controller which measures various parameters from solar farm, wind farm, diesel generators or any other distributed power generator sources. Based on the micro grid loading requirement versus availability of distributed power sources, Merus MCC controller optimizes and prioritizes the overall power generation resulting in lowest operational costs and maximum savings of fossil fuel. Other key building blocks of BESS systems include Merus Power Conversion System (PCS) and energy storage system.

ELCO Power can provide a complete turnkey ESS solution.

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How BESS Works?

Merus Power Conversion System (PCS)
Merus bidirectional state-of-the-art converters use 3-level NPC topology to enable low loss operation, high DC voltage and the best power quality performance thanks to optimized switching frequency.
DC voltage is available with a wide range spanning 600 – 4000Vdc. Bidirectional modules in various sizes are available starting from 50kVA up to 2000kVA, enabling the most cost-efficient solution for each customer-specific project up to hundreds of MWh, or even larger scales.

Battery energy storage
The battery energy system consists of battery modules connected in series to meet the required direct voltage level, typically 600-1500Vdc. The racks are connected in parallel to meet the needed energy capacity. One group of series-connected battery modules form the storage rack. Each rack can have its own battery management system (rack BMS) to manage the state of charge (SOC), state of health (SOH), voltage, current and temperature of each level of battery modules in the rack, as well as the control and protection.

Merus MCC controller for any applications
Merus MCC controller measures system voltages and currents and calculates the required PCS current based on measurements, active operation modes and battery status. It transmits reference current to PCS modules via a fiber optic link enabling real time ESS output control. Merus MCC controller uses modern compatible communication systems to send and receive status and operation mode settings with higher level operators such as a transmission system operator (TSO).
Merus MCC provides energy management for alternative sources including solar, wind and fossil fuel power plants. The fuel saving concept for micro grid operation optimization is provided. Merus ESS has a black start functionality, meaning it has the capability to form a standalone island mode grid, to which other power sources can be syncronized.

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Typical Applications

BESS is the right  solution to solve following power quality challenges: 
1. Generation- Wind, solar and engine-hybrid power plants
> Peak shaving 
> Ramp rate management 
> Energy shifting 
> Power dispatch management

2. Transmission and distribution grids
> Spinning reserve 
> Frequency regulation 
> Power flow optimization 
> System stability improvement 
> Voltage control

3. Industrial and natural island grids, microgrids and hybrid systems
> Energy management for alternative sources including solar, wind and fossil fuel plants 
> Black start functionality 
> Peak shaving 
> Power quality compliance 
> Voltage and frequency control