Dual Variable Speed Generators for Load Imbalance Control
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Solution Overview
Problem
Existing electric power systems with variable speed generators often result in oversized generators due to peak power requirements, and they typically cannot provide multiple voltage outputs simultaneously, such as 120 volts and 240 volts, limiting their versatility and efficiency.
Innovation Solution
A system comprising two variable speed generators with three-phase outputs, each coupled with power control and conversion circuitry, including inverters that share a common electrical node to provide a combination of 120 V and 240 V AC outputs, allowing for dynamic power management and load balancing through a controller that adjusts engine speed and energy storage device usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single variable speed generator is used to meet peak power requirements, then the generator can provide sufficient power during peak demand, but the generator becomes oversized and operates inefficiently during low demand periods
Solution Approach 1:
The power generation system is divided into multiple independent generators (first generator and second generator), each capable of operating independently or in combination. This segmentation allows the system to match generator output more closely with actual power demand, avoiding the inefficiency of oversized single-generator operation during low demand periods.
2Adaptability or versatility
If a single generator provides all power output, then the system structure is simple, but the system cannot provide multiple voltage outputs (120V and 240V) simultaneously
Solution Approach 1:
The outputs of multiple generators are merged through a common inverter system that combines their electrical outputs. This merging approach enables the system to provide multiple voltage outputs (120V and 240V) simultaneously by combining the capabilities of individual generators, achieving versatility without requiring completely separate power systems.
3Loss of energy
If generator size is reduced to match average load demand, then operational efficiency improves, but insufficient power is available during peak demand periods
Solution Approach 1:
The system dynamically adjusts the operation of multiple generators based on real-time power demand. During low demand periods, one or both generators can operate at optimal efficiency points or remain idle. During peak demand, both generators operate simultaneously to provide sufficient power, ensuring both efficiency and adequate power availability.
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
Enables efficient power management by adjusting generator speed and utilizing energy storage to meet varying power demands, providing a stable and versatile AC power output with simultaneous 120 V and 240 V capabilities, reducing generator size and operational costs.
Implementation Method 1
synchronized alternators driven by a common prime mover through a common flexible drive arrangement
Data Source
AI summary
An apparatus includes a vehicular electric power generation system comprising a variable speed internal combustion engine, a first variable speed electric power generator driven by the engine, a second variable speed electric power generator driven by the engine, a first inverter to receive electric power from the first generator a provide a first controlled electric output, a second inverter to receive electric power from the second generator and provide a second controlled electric output, and a controller coupled to the engine. The controller is responsive to variation in electrical loading of the first inverter and the second inverter and a degree of electrical load imbalance between the first inverter and second inverter to provide one or more engine control signals. The engine is responsive to the one more engine control signals to change rotational operating speed to adjust for the variation in electrical loading and the degree of electrical load imbalance.