Hybrid Generator Inverter Architecture for Off-Grid Peak Loads
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Solution Overview
Problem
Existing hybrid generator systems suffer from low energy conversion efficiency, high fuel consumption, and emissions due to inefficient operation of combustion engines, and are limited by the capacity of energy storage, leading to significant conversion losses and constant engine operation.
Innovation Solution
A mobile hybrid generator system that provides AC power output solely through an inverter unit during both normal and peak operations, decoupling the primary energy source from the load, and using a rechargeable energy storage unit to optimize engine operation, allowing for smaller engine sizing and reduced fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the generator is connected to a DC intermediate circuit via a rectifier to supply power to an energy storage device, then the generator can operate at a better operating point, but the maximum load is limited by the capacity of the energy storage and conversion losses occur
Solution Approach 1:
The system dynamically switches between two operating modes: first mode where the generator charges the energy storage device through a DC intermediate circuit, and second mode where the generator connects directly to the load in parallel with the energy storage device. This dynamic reconfiguration allows the system to adapt to varying load conditions, achieving both efficient energy conversion during normal operation and high power output during peak loads without being constrained by energy storage capacity
Solution Approach 2:
The system changes the electrical connection parameters between the generator, energy storage device, and load based on operating conditions. In the first mode, the generator connects to the DC intermediate circuit for efficient energy transfer. In the second mode, the generator directly parallels with the load, bypassing the DC intermediate circuit to eliminate conversion losses and provide maximum power output
2Power
If the generator and inverter are connected in parallel to supply load directly from both generator and DC intermediate circuit, then output power can be increased and peak loads compensated, but the generator must run almost constantly leading to air and noise pollution
Solution Approach 1:
The control device dynamically manages the generator operation based on real-time load conditions and energy storage status. The generator operates only when necessary - either charging the energy storage device during low-load periods or providing direct power during high-demand periods - rather than running constantly. This dynamic operation reduces emissions and noise while maintaining the ability to deliver high output power when needed
Solution Approach 2:
The energy storage device serves as a buffer that can supply power independently during low-demand periods, allowing the generator to remain offline and avoiding unnecessary emissions and noise. The system uses its own energy storage resources to meet base load requirements, reserving generator operation for periods when high power output is actually needed
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
This configuration reduces fossil fuel consumption, minimizes emissions, and enhances energy efficiency by optimizing engine operation, enabling longer autonomous operation and reduced maintenance needs.
Implementation Method 1
an inverter unit configured for converting the DC power output from the rechargeable energy storage unit to the AC power output for the load
Implementation Method 2
at least a first primary energy source, such as an (combustion) engine, for charging the rechargeable energy storage unit
Data Source
AI summary
A mobile hybrid generator system is for providing grid-like AC power output to a load at off-grid locations. Also, a tracked vehicle may include the hybrid generator system as a power supply system. A mobile hybrid generator system for providing grid-like AC power output to a load at off-grid locations may include a housing accommodating: a rechargeable electrical energy storage unit, such as a battery, configured to provide a DC power output, at least a first primary energy source, such as a combustion engine, for charging the rechargeable energy storage unit, and an inverter unit configured for converting the DC power output from the rechargeable energy storage unit to the grid-like AC power output, wherein the mobile hybrid generator is configured such that the grid-like AC power output is provided only from the inverter unit, both during normal mode operation and during peak power operation.