Inverter Control via DC Bus Voltage Detection
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Solution Overview
Problem
Conventional inverter apparatuses experience reduced efficiency at light load conditions due to variations in the surrounding environment, such as cloud cover or shading, which affect the power output from photovoltaic modules, leading to degraded performance.
Innovation Solution
A control method for an inverter apparatus that detects the DC bus voltage and adjusts the operation of the DC/AC converter by switching between normal and burst modes based on detected voltage levels, using a controller coupled to the DC/AC converter to optimize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the inverter apparatus operates at light load conditions, then the power output is reduced to match environmental variations, but the operating efficiency degrades
Solution Approach 1:
The patent applies periodic action by implementing burst mode operation where the DC/AC converter operates in intermittent cycles rather than continuously. The controller switches between normal mode and burst mode based on DC bus voltage thresholds, creating periodic on-off cycles that maintain efficiency while adapting to light load conditions caused by environmental variations.
2Stability of the object's composition
If the DC/AC converter operates continuously to maintain power output, then the power supply stability is improved, but the light-load efficiency degrades
Solution Approach 1:
The patent applies dynamics by making the DC/AC converter's operating state dynamic rather than static. The controller continuously monitors DC bus voltage and dynamically switches between normal mode and burst mode based on real-time conditions. This dynamic adaptation allows the system to maintain power supply stability when needed while improving efficiency during light load conditions.
3Measurement precision
If additional feedback mechanisms are added to detect primary-side output, then the control precision is improved, but the device complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the existing DC bus voltage detection capability that is already present in the inverter apparatus for other control functions. The controller repurposes this existing voltage information to determine burst mode operation, eliminating the need for separate feedback mechanisms or additional detection circuits. This approach maintains detection precision while avoiding increased device complexity.
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 approach enhances light-load operating efficiency by mitigating the effects of environmental changes on the inverter's performance, improving power output stability without requiring additional feedback mechanisms or circuitry, resulting in a compact and cost-effective design.
Implementation Method 1
a direct current to direct current (DC/DC) converter receives a DC power outputted from a photovoltaic module (PV module), boosts the received DC power
Implementation Method 2
the DC/AC converter converts the boosted DC power to an AC power
Data Source
AI summary
A control method for an inverter apparatus is provided. The inverter apparatus includes a direct current to direct current (DC/DC) converter and a direct current to alternating current (DC/AC) converter. An output side of the DC/DC converter is coupled to an input side of the DC/AC converter. The control method includes the following steps: outputting a DC power from the output side of the DC/DC converter; receiving the DC power from the input side of the DC/AC converter, and generating an AC power from an output side of the DC/AC converter according to the DC power; and detecting the DC power, and accordingly controlling an operation of the DC/AC converter.