Single Booster Photovoltaic Inverter Circuit
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Solution Overview
Problem
Conventional multi-string photovoltaic inverters require a booster for each input port, increasing fabrication costs and product volume when connecting multiple photovoltaic modules.
Innovation Solution
A photovoltaic inverter design that connects multiple photovoltaic modules through a single booster unit, utilizing a series of input portions, reactors, a capacitor to store DC voltages, a resistor to consume voltage, and a booster unit in parallel to boost voltages, which are then converted to AC voltage for the grid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a booster is installed at each input port of a multi-string photovoltaic inverter, then each photovoltaic module can be independently processed, but the fabrication cost and product volume increase significantly
Solution Approach 1:
The patent merges multiple booster functions into a single shared booster unit. Instead of having separate boosters for each input port, one booster is configured to process DC voltages from multiple photovoltaic modules by sequentially connecting to different input ports through switching circuitry. This reduces the total number of boosters while maintaining the capability to independently process each module's voltage.
Solution Approach 2:
The single booster unit is designed with multi-functionality to serve multiple input ports. Through control circuitry and switching mechanisms, the booster can be dynamically connected to different input ports to perform voltage boosting for each photovoltaic module in sequence, making one booster perform the work of multiple boosters.
2Ease of manufacture
If multiple photovoltaic modules are connected to a single inverter without individual boosters, then fabrication cost is reduced, but voltage matching and power conversion efficiency deteriorate
Solution Approach 1:
The system employs dynamic switching to connect the single booster to different input ports based on real-time voltage requirements. The switching circuitry dynamically reconfigures the circuit connections to ensure optimal voltage matching between the booster and each photovoltaic module, maintaining high conversion efficiency while using fewer components.
Solution Approach 2:
The booster unit can adjust its operating parameters (such as switching frequency and duty cycle) when connected to different photovoltaic modules with varying voltages. This parameter adaptation allows the single booster to efficiently handle voltage conversion for multiple modules with different electrical characteristics.
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
This design reduces fabrication costs and volume by eliminating the need for individual boosters at each input port while efficiently converting DC to AC voltage for the grid.
Implementation Method 1
a first capacitor configured to store DC voltages of the plurality of photovoltaic modules, respectively, transferred through the plurality of input portions; According to one aspect of this disclosure, the first capacitor is configured to charge (in other words 'store') an average value of the DC voltages of the plurality of photovoltaic modules
Implementation Method 2
a booster unit connected in parallel to the first capacitor and the first resistor connected in parallel to each other, and configured to boost the voltages charged in the first capacitor
Implementation Method 3
an inverter unit configured to convert the voltage boosted by the booster unit into an AC voltage to provide to a grid
Data Source
AI summary
This invention relates to a photovoltaic inverter, capable of connecting a plurality of photovoltaic modules to each input port of a multi-string photovoltaic inverter through a single booster. The photovoltaic inverter disclosed herein includes a plurality of input portions connected in series to a plurality of photovoltaic modules, respectively, a plurality of reactors connected in series to the plurality of input portions, respectively, a first capacitor configured to charge DC voltages of the plurality of photovoltaic modules, respectively, transferred through the plurality of input portions, a first resistor connected in parallel to the first capacitor, a booster unit connected in parallel to the first capacitor and the first resistor connected in parallel to each other, and configured to boost the voltages charged in the first capacitor, and an inverter unit configured to convert the voltage boosted by the booster unit into an AC voltage to provide to a grid.