BESS Energy Offset Control for Parasitic Standby Losses
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Solution Overview
Problem
Battery energy storage systems (BESS) in renewable energy facilities face challenges in maintaining equipment power due to parasitic losses during standby modes, leading to insufficient energy for operational devices, especially when the BESS is not charging or discharging, and reliance on the energy grid may be restricted.
Innovation Solution
An energy offset system is implemented, utilizing a processor to control a second BESS or renewable energy source to supply power to devices within the facility, reading energy meter readings to account for losses and ensure continuous operation by redirecting energy from the grid or other renewable sources as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the BESS is operated in standby mode to store energy for later use, then energy availability for grid charging/discharging is improved, but parasitic losses consume stored energy reducing the energy available to power equipment
Solution Approach 1:
A second BESS is introduced as an intermediary system between the first BESS and the equipment. The second BESS captures parasitic losses from the first BESS and converts them into usable energy through power conversion equipment, thereby compensating for energy losses without affecting the primary energy storage function of the first BESS
Solution Approach 2:
The system changes the energy flow parameters by redirecting parasitic loss energy that would otherwise be wasted. The power conversion equipment transforms the energy from parasitic losses into a usable form, changing its state from waste energy to useful energy that can power equipment
2Quantity of substance
If the BESS is sized to provide enough energy to power all equipment during standby, then equipment power availability is improved, but the BESS cannot sufficiently charge or discharge to the energy grid
Solution Approach 1:
The energy storage function is segmented into two separate BESS units. The first BESS is dedicated to grid charging and discharging operations with optimized capacity for that purpose, while the second BESS handles equipment power requirements including compensating for parasitic losses. This segmentation allows each system to be sized appropriately for its specific function without compromising the other
Solution Approach 2:
The second BESS acts as an intermediary that supplies energy to equipment, preventing the first BESS from needing to be oversized for equipment power needs. This intermediary system enables the first BESS to maintain optimal sizing for grid charging/discharging productivity
3Reliability
If energy from the grid is used to power equipment during BESS standby, then equipment operation is maintained, but grid load increases reducing energy availability for other loads
Solution Approach 1:
The system converts the harmful parasitic losses into a beneficial energy source. The power conversion equipment transforms energy that would be wasted during BESS standby into useful energy that powers equipment, thereby eliminating the need to draw additional energy from the grid while maintaining equipment operation
Solution Approach 2:
The first BESS serves itself by capturing and utilizing its own parasitic losses through the second BESS and power conversion equipment. This self-service mechanism generates energy internally to power equipment, eliminating the need for external grid energy and maintaining reliability without increasing grid consumption
Data Source
AI summary
The present disclosure provides systems and methods for offsetting parasitic energy losses of a battery energy storage system (BESS). A method may include determining, by one or more processors of a renewable energy power plant coupled to an energy grid, a condition is satisfied; and responsive to the determination, adjusting, by the one or more processors, a state of a switch from a first state configured to couple a second BESS with a renewable energy source (RES) to a second state configured to couple the second BESS with the BESS. The RES configured to charge the T-BESS when the switch is in the first state and the T-BESS configured to send energy to the devices to satisfy energy requirements of the devices when the switch is in the second state.