ORC Generator Torque Matching for Stable Power Output
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Solution Overview
Problem
Conventional ORC power generation systems require complex feedback control of the electric power generator's torque based on a target rotation speed map, leading to inefficiencies and increased complexity.
Innovation Solution
An ORC power generation device with a power generator whose torque during rated operation matches that of the expander, coupled with a torque control unit to adjust output current based on voltage, ensuring stable and efficient power generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback control of torque is implemented using a target rotation speed map, then the electric power generator can operate stably and efficiently, but the system complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex feedback control system including the target rotation speed map and torque feedback control mechanisms. Instead, it directly couples the expander output shaft to the power generator input shaft, removing the intermediary control system while maintaining stable and efficient operation through direct mechanical coupling and matched torque characteristics.
Solution Approach 2:
The expander and power generator are designed with matched torque characteristics so that the expander naturally operates at its optimal point without requiring external feedback control. The system serves itself through the inherent torque matching between components, eliminating the need for complex control algorithms and sensors.
2Reliability
If the power generator size is increased to handle load changes, then stability during load changes improves, but device cost and size increase
Solution Approach 1:
The patent changes the torque parameter matching between the expander and power generator. By designing the power generator with torque characteristics that match the expander's output torque curve, the system can handle load changes efficiently without requiring an oversized generator. The torque matching allows the generator to operate near its optimal point across varying loads.
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
Maximizes output and efficiency, reduces mechanical load, and simplifies the system configuration by eliminating the need for complex feedback control, thereby increasing reliability and reducing costs.
Implementation Method 1
an evaporator configured to evaporate the working medium from the pump through heat exchange with a heat source
Implementation Method 2
an evaporator configured to evaporate the working medium from the pump through heat exchange with a heat source
Implementation Method 3
ORC power generation device comprising: a pump configured to discharge a working medium that is condensed; an evaporator configured to evaporate the working medium from the pump through heat exchange with a heat source; an expander configured to be driven by steam generated by evaporation at the evaporator
Implementation Method 4
a condenser configured to condense the steam expanded at the expander to allow discharge from the pump
Data Source
Figure 1
AI summary
There is provided a simple ORC power generation device that can efficiently generate power. The ORC power generation device includes a pump 2 configured to discharge a working medium that is condensed, an evaporator 3 configured to evaporate the working medium from the pump 2 through heat exchange with a heat source, an expander 4 configured to be driven by steam generated by evaporation at the evaporator 3, a condenser 5 configured to condense the steam expanded at the expander 4 to allow discharge from the pump 2, and a power generator 6, an input shaft of which is coupled to an output shaft of the expander 4. The power generator 6 is designed such that torque of the power generator during rated operation matches torque of the expander 4 during rated operation.