Hybrid Generator Control With Battery Support for Peak Load Stability
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Solution Overview
Problem
Conventional hybrid power generation systems face inefficiencies in managing peak loads and power quality, particularly in responding to load changes due to the slow throttle response of gas-fired generators, which can lead to voltage and frequency instability.
Innovation Solution
The integration of an energy storage module (ESM) with a bi-directional inverter and lithium-ion batteries into hybrid generator systems, enabling quick power supplementation during peak loads and maintaining optimal power quality by anticipating and reacting to load changes, and integrating with renewable energy sources and utility grids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas-fired generator is used to provide power during normal and peak loads, then the generator can operate at fixed speed and provide stable power output, but the slow throttle response causes voltage and frequency instability during load changes
Solution Approach 1:
The patent combines a gas-fired generator with an energy storage module (ESM) containing lithium-ion batteries and a bi-directional inverter. The ESM merges with the generator to form a hybrid system where the battery provides fast response to load changes while the generator maintains stable base power, resolving the contradiction between stability and response speed.
Solution Approach 2:
The bi-directional inverter acts as an intermediary between the battery and the generator/load. It manages power flow dynamically, allowing the battery to quickly supplement power during load increases and absorb excess power during load decreases, mediating between the slow generator response and the need for stable voltage and frequency.
2Power
If the generator size is increased to handle peak loads, then peak load capability is improved, but the generator operates inefficiently during normal low-load conditions
Solution Approach 1:
Instead of sizing the generator for peak loads (excessive action), the patent uses the generator for normal base loads (partial action) and supplements with battery power during peak demands. This partial utilization of the generator avoids the inefficiency of operating a large generator at low loads while still meeting peak power requirements.
Solution Approach 2:
The system changes the operating parameters of the generator by decoupling peak load capability from generator size. The battery enables the generator to operate at optimal power nodes (efficient parameters) during normal conditions while providing peak capacity through battery supplementation, rather than forcing the generator to operate across a wide inefficient range.
3Use of energy by moving object
If the generator operates solely on stored energy during reduced power demand, then efficiency is improved and fuel consumption is reduced, but power quality and voltage stability may deteriorate
Solution Approach 1:
The control system continuously monitors power quality parameters (voltage, frequency, load conditions) and provides feedback to manage battery discharge/charge operations. This feedback mechanism ensures that when the generator operates at reduced load or uses battery power, the system maintains voltage and frequency stability by dynamically adjusting battery contribution based on real-time power quality conditions.
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 solution enhances power quality, reduces greenhouse gas emissions, and improves engine efficiency by allowing generators to operate at ideal power nodes, providing reliable and consistent power delivery while reducing the need for human intervention and infrastructure.
Implementation Method 1
The ESM comprises a 500 kVA bi-directional multi-port inverter
Implementation Method 2
a 120 kWh lithium-ion battery with a continuous 2C charge/discharge rating and 3C peak rating
Data Source
AI summary
Devices, methods and systems for providing electrical power are provided. In some embodiments, hybrid generator systems are provided that are capable of both receiving and delivery powering to various different devices and applications, and that are operable to service various demands. Efficiencies in production and signal conditioning are provided wherein stored energy devices and related controls are capable of responding to variable power demands.