Bypass Circuit for Fast Microgrid Frequency Stabilization
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Solution Overview
Problem
Natural energy power generation systems, such as those using solar panels, face instability due to variable natural energy sources, leading to reduced inertial force and limitations in power conversion speed, which affect the stabilization of power distribution grids in microgrids.
Innovation Solution
A bypass circuit is introduced, connecting a power storage apparatus directly to a power conversion apparatus via a switch, allowing surplus power to be stored and discharged as needed to stabilize the power distribution grid, thereby improving power conversion efficiency and addressing inertial force limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power storage system is combined with a natural energy power generation system in a microgrid to stabilize frequency and output power, then the stabilization of power distribution grid is improved, but the device complexity increases
Solution Approach 1:
The power conversion system is divided into a first power conversion apparatus for converting natural energy power and a second power conversion apparatus for managing power storage, allowing independent control of each function while maintaining overall system stability
Solution Approach 2:
A bypass circuit is introduced as an intermediary component that directly connects the power storage apparatus to the power distribution grid, enabling rapid response to frequency deviations without requiring complex control algorithms
2Reliability
If output control principles similar to power generators are applied to power generation inverters to operate as virtual synchronous generators, then the stabilization of power distribution grid is improved, but the power conversion speed is limited
Solution Approach 1:
The control functions are segmented between the first power conversion apparatus (handling natural energy conversion) and the second power conversion apparatus (handling power storage conversion), allowing each to operate at optimal speeds for their respective functions
Solution Approach 2:
The bypass circuit provides a direct electrical connection that replaces the need for mechanical-like virtual synchronous control, enabling instantaneous power transfer and conversion without the speed limitations of conventional control methods
3Productivity
If the bypass circuit is used to directly connect power storage apparatus to power distribution grid, then the power conversion efficiency is improved, but the device complexity increases
Solution Approach 1:
The system is divided into two independent power conversion apparatuses, where the bypass circuit only activates when needed, maintaining simplicity during normal operation while enabling efficient power conversion when required
Solution Approach 2:
The bypass circuit is extracted as a separate, optional component that can be independently activated or deactivated, allowing the main power conversion path to remain simple while providing an efficient alternative route when needed
Data Source
AI summary
A bypass circuit of an embodiment includes a switch that shorts-circuit between a first power conversion apparatus and a power storage apparatus. The switch is connected in parallel to a second power conversion apparatus. The first power conversion apparatus converts power generated from natural energy and outputs the converted power to a power distribution grid. The second power conversion apparatus converts surplus power that has not been converted by the first power conversion apparatus and charges the power storage apparatus with the converted power; or converts power discharged from the power storage apparatus and supplies the converted power to the first power conversion apparatus.