Bidirectional Converter Sequential Driving for Battery Lifespan
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Solution Overview
Problem
Existing energy storage systems face challenges in extending the lifespan of battery packs while maintaining secure power supply and reducing manufacturing costs, particularly in hybrid solar power generation and storage systems.
Innovation Solution
The proposed energy storage system incorporates a configuration of unit bidirectional converters and battery packs, where each unit bidirectional converter corresponds to a battery pack, allowing sequential driving to reduce load and implement a capacitive device for power stabilization, along with a maximum power point tracking converter for efficient solar power utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all battery packs are driven simultaneously to ensure secure power supply, then power supply reliability is improved, but battery lifespan deteriorates due to increased load
Solution Approach 1:
The controller sequentially activates battery packs in groups rather than simultaneously. The controller divides battery packs into multiple groups and activates them in sequence, with each group operating for a predetermined period. This periodic activation pattern reduces the cumulative load on individual battery packs while maintaining continuous power supply capability, thereby extending battery lifespan without compromising power supply reliability.
2Reliability
If multiple bidirectional converters are used to manage multiple battery packs, then power supply security is improved, but device complexity increases
Solution Approach 1:
Each bidirectional converter is designed to perform multiple functions: it can charge battery packs, discharge them, and manage power flow bidirectionally. The converter serves as a universal power management device that handles both charging and discharging operations for its associated battery pack, eliminating the need for separate charging and discharging converters. This multi-functionality reduces the overall number of components while maintaining secure power supply capability.
3Duration of action of stationary object
If battery packs are activated in sequence to reduce load, then battery lifespan is improved, but power supply continuity may be affected
Solution Approach 1:
The controller pre-divides battery packs into multiple groups and prepares activation schedules in advance. Before sequential activation begins, the controller has already organized the battery packs into groups that can be activated in a predetermined sequence. This preliminary organization ensures that when activation begins, the transition between groups is smooth and continuous, preventing power supply interruptions while still achieving load reduction for extended battery lifespan.
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
This configuration extends the lifespan of battery packs, ensures secure power supply even with damaged units, and lowers manufacturing costs by implementing units in a single package, while maintaining efficient energy storage and conversion.
Implementation Method 1
The inverter inverts an alternating current (AC) voltage to a direct current (DC) voltage or inverting a DC voltage to an AC voltage
Implementation Method 2
The converter converts a DC voltage to another DC voltage
Implementation Method 3
a capacitive device that is electrically connected between the converter and the inverter and storing power supplied from the converter
Data Source
AI summary
An energy storage system capable of improving the lifespan of a battery pack while supplying power in a secured manner is provided. In one embodiment, the energy storage system includes a plurality of battery packs connected between a grid and a solar cell to charge/discharge power. The energy storage system includes an inverter connected among the grid, the solar cell, and the battery pack and inverting an alternating current (AC) power to a direct current (DC) power and vice versa according to charging/discharging operations. The energy storage system includes a converter connected to the solar cell, the battery pack, and the grid and converting power supplied from the solar cell, and a plurality of bidirectional converters connected to the plurality of battery packs, the solar cell, and the grid and connected in one-to-one correspondence to the plurality of battery packs and converting the power for charging/discharging the battery pack. The energy storage system further includes a controller connected to the inverter, the converter, and the plurality of bidirectional converters and applying drive signals to sequentially drive the plurality of bidirectional converters.