Hybrid Electric Power Control Device for Fast Response
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Solution Overview
Problem
The hybrid electric power system faces issues with slow output response rates from fuel cell energy generators, leading to instability and erroneous operations, especially during load shedding, due to the gradual increase and decrease in output electric power in response to drastic changes in load-required electric power.
Innovation Solution
An electric power control device is introduced, comprising an electric power measuring unit and a controller that manages the operations of first and second electric power generators. The controller adjusts the output voltage of the first generator based on the state of the second generator, using offset voltage modes to compensate for the slow response rate of the fuel cell generator, ensuring a faster overall output response by switching the generators' states and operation modes accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuel cell energy generator is used in a hybrid electric power system, then reliability is improved through diversified power supply sources, but the output response rate becomes slow causing instability during load changes
Solution Approach 1:
The patent combines a fuel cell energy generator with a solar energy generator in a hybrid electric power system. The controller coordinates both generators to work together, where the solar generator compensates for the slow response of the fuel cell generator, achieving both high reliability and fast response rate simultaneously
Solution Approach 2:
The controller continuously monitors the output power of both the fuel cell generator and solar generator, as well as the load requirements, and dynamically adjusts their operating states. This feedback mechanism enables the system to maintain stability and achieve fast response despite the inherent slowness of the fuel cell generator
2Productivity
If the output of the fuel cell generator is controlled to switch from ON to OFF state, then power distribution is optimized according to load requirements, but the gradual decrease in output power causes delay in responding to drastic load changes
Solution Approach 1:
The controller predicts future power needs based on current load trends and proactively adjusts the operating states of both generators before drastic load changes occur. This preliminary action prevents power deficits and eliminates response delays by preparing the system in advance
Solution Approach 2:
The system dynamically switches between different operating modes (both generators ON, only solar ON, only fuel cell ON) based on real-time conditions. This dynamic adaptability allows the system to optimize power distribution efficiency while maintaining fast response capability through coordinated control
3Power
If the output of the fuel cell generator is controlled to switch from OFF to ON state, then power supply capacity is increased to meet higher load demands, but the gradual increase in output power results in slow overall response
Solution Approach 1:
The solar energy generator is merged with the fuel cell generator to provide combined power output. When the fuel cell generator switches from OFF to ON, the solar generator simultaneously increases its output, creating a combined fast response that meets high load demands while compensating for the fuel cell's slow individual response
Solution Approach 2:
The hybrid system acts as a composite power generation solution, combining two different energy conversion technologies (fuel cell chemical-to-electrical conversion and solar photovoltaic conversion) with different response characteristics. This composite approach leverages the strengths of each technology to achieve both high power capacity and fast response rate
Data Source
AI summary
A electric power control device for a hybrid electric power system according to the present disclosure includes an electric power measuring unit that is configured to measure output electric power of the electric power system, and a controller that is configured to control operations of a first electric power generator and a second electric power generator of the electric power system based on a preset control mode and the measured output electric power, wherein the controller controls an output voltage of the first electric power generator to be a first offset voltage corresponding to an output of the second electric power generator for a first time when the output of the second electric power generator is controlled to be switched from an ON state into an OFF state.