Cooperative Control for PV Optimizer and Inverter Efficiency
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Solution Overview
Problem
The overall conversion efficiency of grid-connected photovoltaic systems is reduced due to independent Maximum Power Point Tracking (MPPT) control by photovoltaic optimizers and inverters, leading to suboptimal performance.
Innovation Solution
A cooperative control method and device that adjusts the voltage of the DC side of the photovoltaic inverter to optimize the match condition between the conversion efficiencies of the photovoltaic optimizer and inverter, determining operation parameters such as average conversion efficiencies and adjusting the voltage to ensure the overall conversion efficiency meets a preset value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the photovoltaic inverter independently tracks the maximum input power of the DC side, then the voltage of the DC side is maintained at the maximum value, but the photovoltaic inverter has the lowest conversion efficiency
Solution Approach 1:
The patent merges the MPPT control functions of the photovoltaic optimizer and photovoltaic inverter into a unified cooperative control system. The optimizer and inverter communicate and coordinate their control actions, replacing independent MPPT operations with a joint control strategy that optimizes the entire system's conversion efficiency rather than individual components.
Solution Approach 2:
The patent changes the control parameter from independently maximizing DC side voltage to cooperatively optimizing the product of conversion efficiencies. The control system adjusts operating parameters based on the relationship between DC voltage, duty cycle, and conversion efficiency to achieve optimal overall performance rather than extreme values.
Data Source
AI summary
A cooperative control method and device for a photovoltaic optimizer and a photovoltaic inverter are provided. The cooperative control method and device are applicable to a grid-connected photovoltaic system including N photovoltaic components, N photovoltaic optimizers and one photovoltaic inverter. The N photovoltaic components are respectively connected to input sides of the N photovoltaic optimizers, and output sides of the N photovoltaic optimizers are connected to a DC side of the photovoltaic inverter, N being an integer greater than or equal to 1. The cooperative control method includes determining an operation parameter of the grid-connected photovoltaic system; judging whether the operation parameter is lower than a preset value; and adjusting a voltage of the DC side of the photovoltaic inverter until the operation parameter is not lower than the preset value, in a case that the operation parameter is lower than the preset value.