Hybrid Power Conversion System Efficiency Optimization
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Solution Overview
Problem
Conventional photovoltaic power conversion systems (PVPCS) are unidirectional and lack versatility in transferring solar light energy to energy sources or loads, limiting their functionality for large-capacity power supply and efficiency optimization.
Innovation Solution
A hybrid power conversion system comprising multiple DC power supplies, converters, and an inverter connected in series, with a switching controller and efficiency measurer to determine optimal switching frequencies for maximum efficiency, allowing for bidirectional power flow and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a PVPCS is used to transfer photovoltaic energy to the grid or load, then the system can convert solar light energy to electrical energy, but the system has unidirectional power flow and limited functionality
Solution Approach 1:
The patent implements bidirectional DC/DC converters that can operate in both power transfer directions (PV to grid and grid to PV), enabling the system to function as both a power generation system and a power storage system. This multi-functionality resolves the unidirectional limitation while maintaining system structure through integrated converter design
2Power
If multiple generation modules are connected in parallel to supply large-capacity power, then the power capacity increases, but the system lacks efficiency optimization capability
Solution Approach 1:
The patent employs dynamic efficiency optimization by continuously adjusting the operating points of multiple generation modules based on real-time efficiency measurements. The system dynamically determines optimal power distribution among parallel-connected modules to maximize overall conversion efficiency while maintaining large-capacity power supply
Solution Approach 2:
The system implements feedback control by measuring the efficiency of each generation module and using this information to adjust operating parameters. The efficiency measurement unit provides feedback signals that enable the control system to optimize power distribution and minimize energy losses across the parallel-connected modules
3Quantity of substance
If multiple batteries are connected in parallel to supply power, then the power capacity and energy storage increase, but the system lacks efficiency measurement and optimization
Solution Approach 1:
The patent implements efficiency measurement for battery modules by monitoring input and output power parameters. The efficiency measurement unit calculates charging and discharging efficiency based on measured values, providing feedback for optimizing battery operation and minimizing energy losses during storage and retrieval
Solution Approach 2:
The system dynamically adjusts battery operation parameters based on efficiency measurements and operating conditions. The control system optimizes charge/discharge rates and power distribution among parallel battery modules to maximize storage efficiency while maintaining high energy storage capacity
4Speed
If switching frequencies are increased to improve power conversion speed, then the response time decreases, but the system efficiency varies and requires optimization
Solution Approach 1:
The patent implements dynamic switching frequency adjustment by determining optimal switching frequencies based on real-time efficiency measurements. The system adaptively changes switching frequencies of converters and inverters to maximize power conversion speed while minimizing switching losses and maintaining high overall efficiency
Data Source
AI summary
A hybrid power conversion system includes an inverter, a switching controller, and an efficiency measurer. The inverter is connected in series to a first converter and a second converter, and the first and second converters are respectively connected to first and second direct current power supplies. The switching controller controls switching frequencies of one or more switches in the first and second converters and the inverter. The efficiency measurer measures efficiency based on the switching frequencies. The switching controller determines the switching frequencies of the one or more switches as frequencies at which the system has a predetermined efficiency based on the efficiency measured by the efficiency measurer.