Energy Storage System Synchronization via Zero Crossing Detection
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Solution Overview
Problem
In energy storage systems, slave power controllers and a master power controller are not synchronized, leading to inconsistent timing in control signal output, which affects the simultaneous and accurate power output from loads.
Innovation Solution
The energy storage system synchronizes slave power controllers by detecting zero crossing points of AC voltage signals and controlling loads based on a preset time lapse since these points, ensuring simultaneous and accurate power output through a master power controller that controls slave power controllers without delay and outputs PWM signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slave power controllers operate independently without synchronization, then each controller can function autonomously, but the control signals are output at different times causing inconsistent power output from loads
Solution Approach 1:
The patent merges the timing reference of all slave power controllers to a common synchronization signal from the master controller. All slave controllers receive and reference the same zero-crossing detection signal, ensuring they operate on a unified time base. This combining of timing references resolves the synchronization issue while maintaining individual controller autonomy.
Solution Approach 2:
The master power controller acts as an intermediary that generates and distributes the synchronization signal to all slave controllers. This intermediary mechanism coordinates the timing of control signals across all controllers without requiring direct communication between slave controllers, simplifying the coordination complexity.
2Productivity
If control signals are transmitted without time reference, then communication is simple, but power output from multiple loads occurs at different times reducing system integration
Solution Approach 1:
The system performs preliminary synchronization by detecting the zero-crossing point of the AC voltage signal before issuing control commands. All slave controllers use this pre-established time reference to coordinate their power output, ensuring simultaneity while accounting for transmission delays through the preset time parameter.
Solution Approach 2:
The patent replaces mechanical timing synchronization with an electrical signal-based synchronization method. By using the zero-crossing detection signal and PWM technology, the system achieves precise timing coordination without mechanical delays, improving power output simultaneity while minimizing time loss.
3Manufacturing precision
If slave power controllers output control signals at different times, then individual controller operation is simple, but the overall system achieves poor integration and accuracy in power output
Solution Approach 1:
The master power controller serves multiple functions: it detects the zero-crossing point, generates the synchronization signal, and distributes timing references to all slave controllers. This multi-functional approach ensures precise power output timing while keeping individual slave controller operations simple and unchanged.
Data Source
AI summary
An energy storage system including a plurality of loads each converting direct current (DC) power stored in a battery thereof into alternating current (AC) power and outputting the AC power, a plurality of slave power controllers detecting zero crossing points of AC voltage signals output from one of the plurality of loads and controlling the plurality of loads in accordance with a control signal received from a master power controller, and the master power controller controlling the plurality of slave power controllers so as to control the plurality of loads in accordance with the control signal received from the master power controller after a preset time has lapsed since the detected zero crossing point.