Energy Storage Control for Multi-Service Operation
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Solution Overview
Problem
Current energy storage systems are limited to providing single services, such as load shifting, peak load shaving, or demand response, resulting in idle time and inability to fully utilize their capacity, which hinders their effectiveness in reducing peak load and energy charges for power supply systems.
Innovation Solution
A charge and discharge control apparatus and method that determines discharge and charge time intervals and power values based on predicted load curves and customer baselines, allowing energy storage systems to provide multiple services like load shifting and peak load shaving, and utilizing residual energy release mechanisms to optimize operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If energy storage systems provide only single service (load shifting, peak load shaving, or demand response), then the service function is simple to implement, but the energy storage system remains idle in many time intervals and cannot fully utilize its capacity
Solution Approach 1:
The energy storage system is designed to perform multiple functions including load shifting, peak load shaving, and demand response simultaneously. The control apparatus determines discharge and charge time intervals and power values based on predicted load curves and customer baselines, enabling the system to provide multiple services and eliminate idle time across different operating conditions.
2Productivity
If energy storage systems provide multiple services simultaneously, then the utilization rate and service capability are improved, but the control complexity and calculation requirements increase
Solution Approach 1:
The control apparatus uses predicted load curves and customer baselines to determine discharge and charge time intervals and power values in advance. By performing preliminary calculations based on predicted conditions, the system can optimize multiple services without requiring complex real-time control, thus managing complexity while maintaining high utilization rates.
3Loss of energy
If energy storage systems operate for load shifting from peak to off-peak hours, then energy charges are reduced, but the system stops operation after discharging in peak hours and cannot provide other services
Solution Approach 1:
The system is designed to perform load shifting, peak load shaving, and demand response services. The control apparatus determines discharge time intervals based on predicted load curves, allowing the system to switch between different service modes and provide multiple functions rather than being limited to a single operation cycle.
4Loss of energy
If energy storage systems are used for peak load shaving only, then the maximum demand charge is reduced, but the operation time is very limited and the system operates only momentarily
Solution Approach 1:
The energy storage system is designed to provide multiple services including load shifting, peak load shaving, and demand response. By determining discharge and charge time intervals based on predicted load curves and customer baselines, the system can extend operation duration through load shifting between peak and off-peak hours while also providing peak load shaving when needed.
5Loss of energy
If energy storage systems participate in demand response load reduction, then customer rewards are obtained, but the system does not operate during non-scheduling time intervals and normal days
Solution Approach 1:
The system is designed to perform demand response load reduction during scheduling time intervals and also provides load shifting and peak load shaving services during non-scheduling time intervals and normal days. The control apparatus uses predicted load curves to determine discharge and charge time intervals, ensuring continuous operation and multiple service provision across all time periods.
Data Source
AI summary
A charge and discharge control apparatus and method are provided. The charge and discharge control apparatus decides multiple discharge time intervals and multiple discharge power values for an energy storage according to a predicted load curve and a peak shaving threshold and decides multiple charge time intervals and multiple charge power values for the energy storage according to the predicted load curve and a customer base line. The peak shaving threshold is between a contracted capacity and a peak value of the predicted load curve. A difference between the peak value and the peak shaving threshold is not greater than a maximum discharge power of the energy storage. The customer base line is between the contracted capacity and a valley value of the predicted load curve. A difference between the customer base line and the valley value is not greater than a maximum charge power of the energy storage.