Grid-Connected Energy Storage Converter Module Switching
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Solution Overview
Problem
Renewable energy power generation systems, such as solar power generation systems, face efficiency issues due to varying energy output from multiple modules, leading to deteriorated converter efficiency.
Innovation Solution
A grid-connected energy storage system with multiple converters and switches, controlled by a controller that selectively connects power generation modules to converters based on their output, optimizing power conversion to a stable DC voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one converter is used for multiple power generation modules, then device complexity is reduced, but converter efficiency deteriorates when generated energy varies between modules
Solution Approach 1:
The system dynamically configures the connection between power generation modules and converters based on real-time power generation status. The controller adjusts which modules are connected to which converters, allowing the system to adapt to varying energy output conditions and maintain optimal converter efficiency while managing device complexity.
Solution Approach 2:
Each converter is designed to handle multiple power generation modules, but the system selectively activates specific converter-module pairings based on operational conditions. This multi-functionality allows converters to serve different modules as needed, optimizing efficiency without requiring a dedicated converter for each module.
2Power
If multiple converters operate simultaneously, then power conversion capacity increases, but system cost and complexity increase
Solution Approach 1:
The system employs dynamic switching between different converter configurations based on total power generation levels. When power generation is high, multiple converters operate in parallel to handle the load. When generation is low, fewer converters are activated, reducing complexity and operational costs while maintaining sufficient power conversion capacity.
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 approach enhances the efficiency of power conversion and extends the life span of converters by ensuring only necessary converters operate at maximum output, thereby improving overall system performance.
Implementation Method 1
a converter configured to convert the power generated by the solar cell modules into direct current (DC) power at a voltage level
Data Source
AI summary
A grid-connected energy storage system capable of increasing the efficiency of a converter and a method of controlling the system are disclosed. In one aspect, the system includes a plurality of converters for converting power generated by each of the plurality of power generation modules into DC power at a voltage level, a plurality of series switches connected to the plurality of power generation modules, and a plurality of parallel switches configured to selectively connect each of the power generation modules to each and every other of the power generation modules. The system also includes a controller configured to control the switches in order to selectively connect each of the power generation modules to at least one selected converter.