Reverse Power Flow Control with Minimum Reception Power Feedback
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Solution Overview
Problem
Renewable energy power plants face challenges in controlling reverse power flow to avoid unintended deviations, which can disrupt the power system and result in financial penalties or power outages, especially when load adjustments are delayed or mismatched with control commands.
Innovation Solution
A reverse flow power control device that includes an input unit, calculator, storage unit, and output unit to manage power generation and load consumption, using a command value re-calculator to adjust output commands and prevent reverse flow power from dropping below a minimum threshold, accounting for device response times and characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the load in a plant is varied in accordance with renewable energy, then the utilization of renewable energy is improved, but control delay occurs resulting in instantaneous reverse flow exceeding the output control command
Solution Approach 1:
The control device performs preliminary calculation of the reverse flow power before the actual reverse flow occurs. By predicting the reverse flow power based on current renewable energy output and plant load characteristics, the system pre-adjusts the load or output power to prevent instantaneous reverse flow exceeding the control command, thereby eliminating control delay effects.
2Reliability
If a protection function is used to stop power generation when reverse flow is likely to occur, then reverse flow is prevented, but power generation cannot be restarted immediately due to confirmation operations
Solution Approach 1:
The control device continuously monitors actual reverse flow power and compares it with the output control command in real-time. When the actual reverse flow power exceeds the control command, the system immediately provides feedback to adjust the renewable energy power generation or plant load, creating a closed-loop control system that prevents reverse flow without stopping power generation.
3Productivity
If reverse flow power exceeds the output control command, then financial penalty is incurred, but allowing reverse flow enables power selling income
Solution Approach 1:
The control device establishes a real-time feedback mechanism that continuously compares actual reverse flow power with the output control command. When reverse flow power approaches or exceeds the control command threshold, the system immediately adjusts renewable energy output or plant load to maintain compliance, enabling continuous power selling without financial penalties.
Data Source
AI summary
According to an embodiment, a reverse flow power control device includes: an input unit that accepts actual values of output power of the power conditioner, load power with respect to the load device, and reception power, and a minimum reception power value; a storage unit; and a calculator having an output controller that calculates an output command calculation value, a load controller that calculates a load command calculation value, and a command value re-calculator that calculates, by using the respective actual values, the output command calculation value, the load command calculation value, and the minimum reception power value, an output command value with respect to the power conditioner, in order to prevent a reception power value from the power system from becoming less than the minimum reception power value.