Communication Host for Photovoltaic Power Generation System
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Solution Overview
Problem
Conventional photovoltaic power generation systems face inefficiencies due to series and parallel mismatches among modules, leading to suboptimal power generation capacity, especially when there are differences in module parameters or shading effects.
Innovation Solution
A communication host is integrated into the photovoltaic power generation system to acquire operating state parameters, determine triggering conditions, and adjust the DC bus voltage or output voltage limiting values of optimizers to optimize power generation, ensuring that all modules operate at maximum capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DC bus voltage is controlled to be a constant value to ensure inverter operates in optimal range, then the inverter operation stability is improved, but the maximum power generation capacity cannot be achieved when there is great difference between maximum powers of photovoltaic panels
Solution Approach 1:
The patent transforms the static constant DC bus voltage control into a dynamic control system that can adjust voltage levels based on real-time power differences between parallel photovoltaic strings. The system dynamically switches between first voltage level (when power difference exceeds threshold) and second voltage level (when power difference is within threshold), enabling both inverter stability and maximum power generation capacity to be achieved under varying operating conditions.
Solution Approach 2:
The patent changes the DC bus voltage parameter from a fixed constant value to a variable parameter that can take different voltage levels based on system conditions. By monitoring the power difference between parallel strings and adjusting the voltage level accordingly, the system optimizes both inverter operation and overall power generation capacity.
2Productivity
If module-level MPPT optimizers are added to each photovoltaic module to solve series and parallel mismatch, then the power generation capacity is improved, but the system complexity and cost increase
Solution Approach 1:
The patent segments the photovoltaic system into parallel strings with independent power monitoring, allowing separate control of each string's voltage level. This segmentation enables the system to address power mismatches between strings without requiring complex module-level optimizers on every module, reducing overall system complexity while maintaining improved power generation capacity.
Solution Approach 2:
The patent introduces a voltage regulation mechanism as an intermediary between the photovoltaic strings and the inverter. This intermediary controls the DC bus voltage level to balance power distribution among parallel strings, achieving the power optimization function without requiring direct module-level intervention, thus simplifying the overall system architecture.
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 system achieves maximum power generation capacity by dynamically adjusting the DC bus voltage and output voltage limiting values, thereby overcoming the limitations of conventional systems.
Implementation Method 1
multiple photovoltaic modules are connected in series to form a photovoltaic string
Data Source
AI summary
A communication host and a photovoltaic power generation system are provided. The communication host includes an acquiring module, a determining module and a control module. The acquiring module is configured to acquire an operating state parameter of the system. The determining module is configured to determine whether the optimizer meets a first preset triggering condition based on the operating state parameter. In a case where the optimizer meets the first preset triggering condition, a first triggering instruction is transmitted, to instruct the system to decrease, in response to the first triggering instruction, the direct current bus voltage of the grid-connected inverter, and/or a second triggering instruction is transmitted, to instruct the system to increase, in response to the second triggering instruction, an output voltage limiting value of at least one of the optimizers meeting the first preset triggering condition.