PI-INC MPPT Controller for Photovoltaic Systems
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Solution Overview
Problem
Existing photovoltaic (PV) systems face inefficiencies in maximum power point tracking (MPPT) due to oscillations and slow response times, particularly with methods like perturbation and observation, and incremental conductance, which result in energy loss and reduced conversion efficiency.
Innovation Solution
A photovoltaic system employing a power-increment-aided incremental-conductance MPPT controller using constant-frequency variable-duty control, which sets up a threshold tracking zone on the Ipv-Vpv curve and switches between PI coarse tracking and INC fine tracking based on power increments to quickly and accurately reach the maximum power point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If perturbation and observation method is used for MPPT, then the method is widely used and simple to implement, but it causes oscillation around the maximum power point resulting in energy loss and decreased conversion efficiency
Solution Approach 1:
The patent segments the MPPT process into two distinct phases: coarse tracking phase using perturbation and observation method to reach the vicinity of MPP, and fine tracking phase using incremental conductance method to precisely track and eliminate oscillations. This segmentation allows each method to operate in its optimal range, reducing overall energy loss while maintaining implementation simplicity.
Solution Approach 2:
The patent dynamically switches between two MPPT algorithms based on the operating conditions and proximity to the maximum power point. The system transitions from perturbation and observation to incremental conductance when approaching the MPP, creating a dynamic hybrid control strategy that adapts to real-time system state to minimize oscillations and energy loss.
2Measurement precision
If incremental conductance method is used for MPPT, then tracking accuracy is improved and oscillation is decreased, but response speed becomes slow particularly at left and right sides of the maximum power point
Solution Approach 1:
The patent divides the operating range into two zones: a threshold tracking zone around the MPP where incremental conductance provides accurate fine tracking, and outer regions where perturbation and observation provides faster coarse tracking. This spatial segmentation of the control strategy optimizes both response speed in outer regions and tracking accuracy near the MPP.
Solution Approach 2:
The patent applies preliminary coarse tracking using perturbation and observation method to quickly bring the system close to the maximum power point before switching to incremental conductance for precise tracking. This preliminary action reduces the distance to MPP, enabling the slower incremental conductance method to achieve accurate tracking more quickly overall.
3Productivity
If hybrid PI-INC MPPT controller is used with threshold tracking zone, then response speed and tracking accuracy are both improved, but device complexity increases
Solution Approach 1:
The patent merges two MPPT algorithms (perturbation and observation, incremental conductance) into a single hybrid controller that operates seamlessly across different operating conditions. By combining the strengths of both methods and implementing a unified threshold-based switching logic, the system achieves high performance without requiring completely separate control circuits for each method.
Solution Approach 2:
The patent implements dynamic switching logic that automatically adjusts the control strategy based on real-time system state and proximity to the maximum power point. The threshold tracking zone dynamically adapts to changing operating conditions, allowing the controller to optimize performance across varying irradiance and temperature conditions without manual intervention or complex configuration.
Data Source
AI summary
The configurations of photovoltaic system and methods thereof are provided. The proposed photovoltaic system includes a PI-INC MPPT controller using a constant-frequency variable-duty (CFVD) control and guided by an Ipv-Vpv curve and a Ppv-Vpv curve.