Generator Set Adaptive Droop Control for Failsafe Stability
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Solution Overview
Problem
Conventional failsafe control schemes for generator sets introduce instability and uneven load distribution due to abrupt changes in operation when switching between isochronous and droop gensets, leading to potential overload of isochronous gensets and underload of droop gensets during communication losses.
Innovation Solution
An adaptive droop control scheme that adjusts the frequency of droop gensets to match isochronous gensets and varies load with respect to frequency for lower-range and upper-range loads, implemented through a controller communicating with gensets and loads to manage load distribution dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional droop control scheme is used during failsafe condition, then droop gensets operate separately with predefined target load, but this causes abrupt frequency and load point shifts leading to system instability and loss of power synchronization
Solution Approach 1:
The patent implements dynamic droop characteristics by making the droop percentage adjustable and adaptive rather than fixed. The controller dynamically modifies droop settings based on operating conditions, allowing smooth transitions between isochronous and droop control modes without abrupt frequency or load point shifts, thereby maintaining system stability during failsafe conditions
Solution Approach 2:
The patent changes the droop parameter from a fixed predefined value to an adjustable variable. The controller can modify droop percentage and target load settings adaptively, enabling gradual frequency and load point adjustments when switching control modes, which prevents instability and maintains power synchronization
2Reliability
If conventional droop control scheme is used during failsafe condition, then droop gensets are limited to fixed operating frequencies and predefined target load, but this results in uneven load distribution where isochronous gensets become overloaded while droop gensets remain underloaded
Solution Approach 1:
The patent implements dynamic load sharing by making droop characteristics adjustable. The controller continuously adapts droop percentage and target load settings based on real-time operating conditions, enabling flexible and balanced load distribution across all gensets regardless of whether they are operating in isochronous or droop mode, preventing both overload and underload conditions
Solution Approach 2:
The patent modifies the fixed droop target load parameter to become an adaptive variable. The controller adjusts target load settings dynamically based on system conditions, allowing droop gensets to flexibly share load more evenly with isochronous gensets, thereby achieving balanced load distribution and improving overall system adaptability
Data Source
AI summary
A method of controlling a plurality of gensets during a failsafe condition is provided. The method may include operating one or more of the gensets according to a modified isochronous control scheme, and operating a remainder of the gensets according an adaptive droop control scheme. The modified isochronous control scheme may include varying the frequency of each isochronous genset with respect to load for lower-range loads and upper-range loads, and maintaining the frequency of each isochronous genset at nominal frequencies for mid-range loads. The adaptive droop control scheme may include adjusting the frequency of each droop genset to match the frequency of the isochronous gensets, and varying the load of each droop genset with respect to frequency for lower-range loads and upper-range loads.