Energy Storage Control Device for Peak Load Management
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Solution Overview
Problem
Existing energy storage system control devices face challenges in managing peak load demand, leading to instability in power networks due to mismatched demand and supply, and require excessive facility investment to prepare for peak power consumption, while also struggling to account for seasonal power shortages and time-dependent power supply errors.
Innovation Solution
A control device that calculates a power reserve margin (PRM) by determining the difference between reference and measured voltage and frequency, and uses this PRM, along with active and reactive power coefficients, to calculate a switch control value for the energy storage system, enabling efficient charging and discharging operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If generation is sufficiently great to be capable of bearing peak consumption, then power network stability is improved, but excessive facility investment occurs
Solution Approach 1:
The energy storage system performs preliminary charging during off-peak hours when power demand is low, storing energy in advance for use during peak consumption periods. This preliminary action allows the system to meet peak demand without requiring excessive generation capacity to be maintained continuously, thereby reducing facility investment while maintaining power network stability.
Solution Approach 2:
The control device dynamically adjusts the operating parameters of the energy storage system based on real-time power demand conditions. By changing the charging/discharging rate and power output parameters according to load variations, the system can efficiently meet peak demand without requiring oversized generation facilities, thus resolving the contradiction between reliability and investment cost.
2Reliability
If generator prepares for generating as much as peak power, then power network stability is improved, but device complexity increases
Solution Approach 1:
The power supply function is segmented into base load generation and peak load supplementation. The energy storage system handles the variable peak demand portion, allowing the generator to operate at a more stable, optimized capacity. This segmentation simplifies generation capacity planning while maintaining the ability to meet peak power requirements.
3Ease of operation
If simple coefficient-based control is used, then ease of operation is improved, but adaptability to seasonal power shortages and time-dependent errors deteriorates
Solution Approach 1:
The control device incorporates real-time feedback mechanisms that continuously monitor power demand, storage state of charge, and system conditions. This feedback enables the system to automatically adjust its charging and discharging operations in response to seasonal variations and time-dependent power requirements, significantly improving adaptability while maintaining ease of operation through automated control.
Solution Approach 2:
The control system transitions from static coefficient-based control to dynamic control that adapts to changing conditions. By continuously adjusting control parameters based on real-time measurements and predictions of power demand patterns, the system achieves both ease of operation and high adaptability to seasonal and temporal variations.
Data Source
AI summary
A control device of an energy storage system is provided. The control device includes a voltage calculation unit calculating the difference between a reference voltage and a measured voltage; frequency calculation unit calculating the difference between a reference frequency and a measured frequency; a power reserve margin (PRM) calculating a ratio of reserve power to the maximum consumption of power; and a power calculation unit using, as input values, coefficients calculated at the voltage calculation unit, the frequency calculation unit and the PRM calculation unit, and calculating a switch control value of an energy storage system by further using a difference in reactive power and active power.