Inverter Control Circuit Voltage Difference Detection for MPPT
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Solution Overview
Problem
Inverters in AC power systems face system outages due to failure to respond instantly to changes in output capability of DC power generation apparatuses, such as photovoltaic modules, where input voltage differences become too large, leading to unstable power performance.
Innovation Solution
An inverting apparatus with an inverting circuit, detection circuit, and control circuit that calculates voltage differences between input and command voltages, adjusting the command voltage based on maximum power point tracking (MPPT) operations to prevent system outages by setting the command voltage to the current input voltage when differences exceed a preset value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the inverting apparatus uses conventional control methods to convert DC input power to AC output power, then the inverting apparatus can operate under normal conditions, but it fails to respond instantly when the output capability of the DC power generation apparatus suddenly changes, resulting in system outage
Solution Approach 1:
The control method dynamically adjusts the command voltage based on the detected voltage difference. When the voltage difference exceeds the preset value, the command voltage is updated to follow the input voltage changes, enabling the system to adapt dynamically to sudden changes in DC power generation output capability and prevent system outage
Solution Approach 2:
The control circuit continuously detects the input voltage and calculates the voltage difference between the detected input voltage and the command voltage. This feedback mechanism allows the system to monitor voltage deviations and adjust the command voltage accordingly, ensuring instant response to changes in DC power generation output
2Reliability
If the inverting apparatus adjusts the command voltage to follow the input voltage changes, then the system stability is improved, but the voltage difference may become too large causing the inverting apparatus to fail
Solution Approach 1:
The control method applies partial action by only updating the command voltage when the voltage difference exceeds the preset value. This conditional adjustment ensures that the command voltage follows input voltage changes only when necessary, maintaining system stability while preventing excessive voltage differences that could cause inverting apparatus failure
Data Source
AI summary
An inverting apparatus and a control method thereof are provided. The inverting apparatus includes an inverting circuit, a detection circuit, and a control circuit. The control circuit is coupled to the inverting circuit and the detection circuit and configured to provide a control signal to control the inverting circuit so as to adjust a voltage value of an input voltage into a command voltage represented by the control signal. The control circuit calculates a voltage difference between the detected input voltage and the command voltage so as to determine whether the voltage difference is greater than a preset value. When determining that the voltage difference is greater than the preset value, the control circuit sets the voltage value of the command voltage as the voltage value of the current input voltage.