Ship Pulse Load Compensation With Adaptive Interharmonic Tracking
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Solution Overview
Problem
Existing power fluctuation compensation technologies for ship pulse loads are inadequate, particularly under harsh conditions, as they fail to effectively address interharmonic power fluctuations, leading to significant power fluctuations that threaten normal operation of rotating devices like generators.
Innovation Solution
A rapid tracking and adaptive compensation method is proposed, which models the relationship between harmonic power of the pulse load and its parameters, performs power spectrum analysis for real-time adjustments, and uses power loop control logic to achieve adaptive matching compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a filter with a fixed filtering time constant is used for power fluctuation compensation, then the device complexity is reduced and ease of operation is improved, but the adaptability to different operating conditions deteriorates and compensation effectiveness decreases under harsh conditions
Solution Approach 1:
The patent implements dynamic adaptability by enabling the filtering time constant to be adjusted in real-time based on operating conditions. The system transitions from a fixed time constant filter to an adaptive filter whose parameters are dynamically modified according to the pulse load characteristics and system state, allowing optimal compensation performance across varying operating conditions while maintaining operational simplicity through automated adjustment.
2Device complexity
If existing power fluctuation compensation technologies are used, then the device complexity is kept low, but the power fluctuation compensation effectiveness deteriorates under harsh conditions
Solution Approach 1:
The patent improves compensation effectiveness by dynamically changing the filtering time constant parameter based on operating conditions. Instead of using a fixed parameter, the system continuously adapts the time constant to match the pulse load characteristics, thereby maintaining high compensation effectiveness across different operating scenarios without significantly increasing device complexity.
3Device complexity
If compensation is based on harmonic current or bus voltage only, then the measurement and control is simplified, but the power fluctuation compensation effectiveness deteriorates because power fluctuation is influenced by both current and voltage
Solution Approach 1:
The patent enhances power fluctuation compensation precision by implementing a comprehensive compensation approach that simultaneously considers both current and voltage factors. The system integrates harmonic current analysis with bus voltage monitoring to comprehensively assess power fluctuation characteristics, enabling more accurate compensation that accounts for the combined influence of both electrical parameters on power stability.
4Speed
If a fixed filtering time constant is used, then the system response is faster and simpler, but the tracking accuracy of power fluctuation deteriorates under variable pulse load parameters
Solution Approach 1:
The patent resolves the contradiction between response speed and tracking accuracy by implementing a dynamic time constant adjustment mechanism. The system maintains fast response through automated real-time adaptation of the filtering time constant to match variable pulse load parameters. By continuously optimizing the time constant based on current operating conditions, the system achieves both rapid response and high tracking accuracy without manual intervention.
Data Source
AI summary
A tracking and adaptive compensation method for power fluctuation of a pulse load of a ship is provided. The method includes: based on a microgrid topology model of the ship, a pulse load model of the pulse load, and an interharmonic power and pulse parameter relationship model, performing power fluctuation tracking, frequency selection and a power spectrum analysis to obtain filtering parameters of a low-pass filter and filtering parameters of a band-pass filter; performing waveform adaptation to eliminate a phase delay caused by the low-pass filter and the band-pass filter, and obtaining a control command for a power compensation strategy; and generating, by a power loop, a pulse width modulation (PWM) signal to control a switching tube in a bidirectional direct current (DC)/DC converter of each of an energy storage battery pack and a supercapacitor of a hybrid energy storage system.