ESS Discharge Scheduling for Baseline Load and Peak-Time Efficiency
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Solution Overview
Problem
Current energy storage systems (ESS) lack a method to prevent a decrease in customer baseline load during power demand response bidding, which is essential for maintaining charging/discharging efficiency and minimizing equalized discharge amounts during maximum load times.
Innovation Solution
An ESS charging/discharging schedule management device that includes a load amount data storage unit, power control unit, demand response participation capacity calculation unit, scheduler, and CBL management unit to manage and control charging/discharging based on seasonal and time-period-specific power loads, ensuring equalized discharge is minimized during maximum load times while maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If equalized discharge is performed during maximum load time period, then charging/discharging efficiency is improved, but customer baseline load decreases
Solution Approach 1:
The patent segments the discharge operation into two distinct parts: equalized discharge (for maintaining charging/discharging efficiency) and power demand response participation capacity (for preventing customer baseline load decrease). By dividing the total discharge capacity and allocating different portions to different purposes at different times, the system resolves the contradiction between improving efficiency and maintaining baseline load.
Solution Approach 2:
The patent dynamically adjusts the discharge schedule by calculating and managing different discharge amounts based on time periods (maximum load, medium load, light load) and days of the week. The CBL management unit determines variable discharge amounts that change according to operational conditions, allowing the system to optimize both efficiency and baseline load maintenance dynamically rather than using a fixed discharge schedule.
2Power
If discharge amount is increased during maximum load time, then power demand response participation capacity is improved, but customer baseline load decreases
Solution Approach 1:
The patent calculates the power demand response participation capacity in advance by subtracting the equalized discharge amount from the total discharge capacity. The scheduler then manages the CBL calculation period (most recent five days on weekdays) and determines discharge schedules beforehand, allowing the system to prepare and allocate discharge capacity for power demand response participation while preventing baseline load decrease through pre-planned discharge management.
Solution Approach 2:
The CBL management unit acts as an intermediary that coordinates between the equalized discharge requirement and the power demand response participation capacity requirement. It calculates the remaining capacity after equalized discharge and uses this as the basis for determining power demand response participation, thereby mediating the relationship between these two competing demands and preventing customer baseline load decrease.
Data Source
AI summary
Provided is an ESS charging/discharging schedule management device, and in particular, to an ESS charging/discharging schedule management device which maintains the charging/discharging efficiency of an energy storage device and minimizes an equalized discharge amount during a maximum load time period, thereby preventing a decrease in a customer baseline load which is a baseline for power demand response bidding.