MPPT Bypass Circuit for PV Switching Loss Reduction
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Solution Overview
Problem
Maximum power point trackers (MPPTs) in photovoltaic systems experience switching losses due to high-frequency switching operations, which reduce efficiency and increase energy losses.
Innovation Solution
A circuit arrangement with a maximum power point tracker (MPPT) and a bypass circuit that enters a bypass state based on output and source currents, allowing the source current to bypass the MPPT when not needed, thereby minimizing switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a maximum power point tracker with switched-mode converter is used to operate PV array at maximum power point, then the PV array can operate independently of load requirements and maintain maximum power point, but switching losses occur due to high-frequency switching operations
Solution Approach 1:
The patent extracts the switching converter from the mandatory path by introducing a bypass circuit that can divert current around the MPPT when maximum power point tracking is not required. This separates the MPP tracking function from the mandatory current path, allowing the system to operate at MPP when needed while avoiding switching losses when not needed.
Solution Approach 2:
The patent implements dynamic operation by making the bypass circuit controllable, allowing the system to switch between MPP tracking mode and bypass mode based on operational requirements. The bypass circuit is configured to enter a bypass state dependent on output current and source current, enabling adaptive operation that minimizes switching losses while maintaining MPP tracking capability when needed.
2Productivity
If maximum power point tracking is always active to maintain optimal power extraction, then maximum power is extracted from PV array, but unnecessary switching losses occur when full tracking capability is not needed
Solution Approach 1:
The patent applies partial action by making the MPP tracking function optional rather than always active. The bypass circuit allows the system to operate with full MPP tracking when power extraction efficiency is critical, while allowing the tracking function to be bypassed when full tracking capability is not needed, thus avoiding excessive switching losses.
Solution Approach 2:
The patent changes the operational parameter of the MPPT by introducing a controllable bypass mechanism. The bypass circuit is configured to enter a bypass state dependent on the relationship between output current and source current, dynamically adjusting whether the MPPT is active or bypassed based on real-time operational 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
The bypass circuit reduces overall system losses by avoiding unnecessary switching operations, enhancing the efficiency of photovoltaic systems by operating the PV panel close to its maximum power point without incurring power losses.
Implementation Method 1
In the bypass state, the bypass circuit permanently sets a switching state of the at least one switch such that the source current is allowed to pass the DC-DC converter
Data Source
AI summary
A circuit arrangement, includes output terminals that provide an output current and input terminals that receive a source current and a source voltage from a DC current source. A maximum power point tracker is coupled between the input terminals and the output terminals and a bypass circuit is coupled between the input terminals and the output terminals. The bypass circuit is configured to enter a bypass state dependent on the output current and dependent on the source current. The source current flows through the bypass circuit in the bypass state.