Power Quality Compensation in Renewable Power Management
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Solution Overview
Problem
Conventional renewable energy power generators, such as photovoltaic and wind power, face instability due to weather fluctuations, leading to poor power quality and potential malfunctions in loads, requiring advanced power management systems to stabilize and improve power supply.
Innovation Solution
A power management device with switches, converters, and a processor that monitors and compensates for voltage, current, and power quality by converting and controlling power flow, including online and echo compensation modes, and managing battery charging/discharging to maintain stable power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power is directly supplied from power source to load without conversion, then power loss is reduced and efficiency is improved, but power quality cannot be compensated when abnormalities occur
Solution Approach 1:
The patent introduces a power management device as an intermediary component between the power source and load. This device includes a converter that can convert power in online compensation mode, and a switch that enables direct power supply in echo compensation mode. The system dynamically selects between these two modes based on power quality conditions, thus resolving the contradiction between minimizing power loss and ensuring power quality compensation.
2Reliability
If converter is used to convert power for quality compensation, then power quality is improved, but device complexity and power loss increase
Solution Approach 1:
The patent implements dynamic operation modes that allow the power management device to switch between online compensation mode (with converter active) and echo compensation mode (with switch active for direct power supply). This dynamic adaptability enables the system to use the converter only when power quality compensation is needed, thereby reducing overall device complexity and minimizing power loss while maintaining power quality improvement capabilities.
3Reliability
If converter continuously operates to maintain power quality, then power quality is stabilized, but energy consumption increases
Solution Approach 1:
The patent employs periodic monitoring of power quality parameters (voltage, current, frequency) and switches between online compensation mode and echo compensation mode based on the monitored conditions. The converter operates periodically only when power quality abnormalities are detected, rather than continuously. This periodic action stabilizes power quality when needed while significantly reducing energy consumption during normal operating conditions.
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 device ensures stable and high-quality power supply to loads, preventing malfunctions and optimizing energy usage by dynamically adjusting power flow and storage, enhancing the reliability and efficiency of renewable energy systems.
Implementation Method 1
a converter connected to the first switch in parallel and configured to convert a voltage and a current received from the power source
Data Source
AI summary
Disclosed is a power management device configured to stably supply power and save power by managing power quality includes a first switch, a converter, a voltage detector, a current detector, and a processor configured to control power of the power source to be supplied to the load through the first switch by turning the first switch on in an echo compensation mode, monitor power quality based on the detected current and the detected voltage, and when it is determined that the power quality has been abnormal, perform compensation control through the converter in a turned-on state of the first switch or control the power of the power source to be supplied to the load through the converter by turning the first switch off.