ESS Group Control for Distributed Grid Voltage Stabilization
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Solution Overview
Problem
The challenge lies in efficiently managing the charging and discharging of energy storage systems (ESS) to stabilize voltage in grids connected to distributed resources, particularly due to unpredictable power demand and supply imbalances exacerbated by variable renewable energy sources, and the complexity and cost of ESS installation and management.
Innovation Solution
A method and device for managing ESS groups to stabilize grid voltage by charging or discharging based on measured voltage and current differences, calculating required amounts, and providing incentives for voltage stabilization, utilizing neural networks for demand prediction and ESS group participation determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ESS construction is promoted to address power supply-demand imbalance, then voltage stabilization capability is improved, but system complexity and installation burden increase
Solution Approach 1:
The patent divides the ESS system into multiple groups (first ESS group, second ESS group, etc.) with different charge/discharge characteristics. Each group is managed independently with specific control strategies, transforming a complex monolithic system into manageable segments that can be controlled separately to achieve voltage stabilization.
Solution Approach 2:
The patent implements dynamic control by adjusting charge/discharge rates based on real-time voltage conditions. The control device modifies operating parameters dynamically - increasing charge rate when voltage is high, decreasing it when voltage approaches reference levels, and reversing for discharge operations, thereby adapting to changing grid conditions.
2Reliability
If multiple ESS groups are managed for voltage control, then voltage stabilization performance is improved, but control complexity increases
Solution Approach 1:
The patent applies different control strategies to different ESS groups based on their specific characteristics and positions in the system. Each ESS group receives tailored control instructions (charge, discharge, or standby) optimized for its local conditions, allowing differentiated management that simplifies overall control while maintaining high stabilization performance.
Solution Approach 2:
The control device continuously monitors voltage levels and uses this feedback to adjust charge/discharge operations of ESS groups. The system measures actual voltage, compares it with reference values, and modifies control commands accordingly - increasing charge rate when voltage exceeds thresholds, decreasing it when approaching reference levels, thereby creating a closed-loop control system.
3Speed
If ESS charge/discharge operations are intensified for voltage control, then voltage response speed is improved, but energy loss increases
Solution Approach 1:
The patent implements partial action by adjusting charge/discharge rates proportionally to voltage deviations rather than operating at maximum capacity continuously. The control device increases charge rate partially when voltage is high and decreases it gradually as voltage approaches reference levels, avoiding excessive operations that would cause unnecessary energy loss while maintaining adequate response speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables effective voltage control of grids connected to distributed resources by managing ESS groups, facilitating efficient charging and discharging, and offering performance incentives, thereby simplifying ESS management and enhancing grid stability.
Implementation Method 1
The ESS includes a battery that stores electricity and related components such as a power conditioning system (PCS), an energy management system (EMS), and a battery management system (BMS) for efficiently managing the battery.
Data Source
AI summary
Provided is a method, device, and system capable of performing control so that the voltage of a grid to which a distributed resource is connected is decreased through charging of an ESS group, performing control so that the voltage of the grid to which the distributed resource is connected is increased through discharging of the ESS group, calculating a voltage control amount through a charge amount and a discharge amount for each ESS group when the voltage of the grid to which the distributed resource is connected is stabilized, and providing a performance incentive for voltage stabilization based on the voltage control amount.