DC Bus Diode Feedback for Fast High-Voltage Ride-Through Detection
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Solution Overview
Problem
Existing power supply systems struggle to quickly detect high voltage ride-through events and implement fault isolation, leading to inefficiencies in power delivery and stability issues during grid voltage fluctuations.
Innovation Solution
A power supply system with a direct current voltage conversion apparatus and an inverter, where a diode is connected in series to the direct current bus, and a controller monitors the bus voltage to determine high voltage ride-through, controlling the diode's state and output power to maintain stability and isolate faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diode is connected in series to the direct current bus for fault isolation, then fault isolation capability is improved, but the ability to quickly detect high voltage ride-through is worsened because the voltage conversion circuit cannot accurately detect the inverter bus voltage
Solution Approach 1:
The patent introduces a sampling resistor connected in parallel with the diode as an intermediary component. This sampling resistor provides an alternative path for voltage detection, allowing the voltage conversion circuit to detect the inverter bus voltage through the sampling resistor even when the diode is blocking the main current path. This resolves the contradiction by enabling detection without compromising fault isolation capability.
2Productivity
If the voltage conversion circuit operates in MPPT normal operation state, then power conversion efficiency is improved, but the response speed to grid faults is worsened because the circuit has not received fault information
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the inverter bus voltage through the sampling resistor and compares it with a preset threshold. When the voltage exceeds the threshold indicating a high voltage ride-through event, the controller immediately adjusts the operating state of the voltage conversion circuit. This feedback loop enables the system to maintain efficient MPPT operation under normal conditions while responding quickly to grid faults.
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
Enables rapid detection and isolation of high voltage ride-through, improving the efficiency of power delivery and maintaining active power balance in the alternating current power grid during faults, thus ensuring system stability.
Implementation Method 1
a diode connected in series to the direct current bus, where the diode is conducted when the direct current voltage conversion circuit outputs electric energy, and is cut off when the direct current voltage conversion circuit receives electric energy
Data Source
AI summary
A power supply system for controlling the power supply system includes a direct current voltage conversion apparatus, an inverter, and a diode. The direct current voltage conversion apparatus includes a controller and a direct current voltage conversion circuit. The controller is configured to: control the output voltage of the direct current voltage conversion circuit, so that the diode is in a conducted state; detect a voltage on the direct current bus; and determine, based on the voltage on the direct current bus, whether high voltage ride-through occurs in the power supply system. According to the power supply system and the method for controlling the power supply system provided in this application, high voltage ride-through can be quickly detected while fault isolation is implemented, thereby improving efficiency of detecting high voltage ride-through.