Power Generation System Reverse Power Flow Control
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Solution Overview
Problem
Conventional power generation systems with multiple distributed power sources require numerous current sensors to detect reverse power flow, leading to increased costs and structural challenges, as well as temporary power supply disruptions when all sources reduce output.
Innovation Solution
A control method where a power generation system with a single current sensor determines target power output for multiple power generation apparatuses, allowing them to adjust their output to prevent reverse power flow efficiently, reducing the need for multiple sensors and minimizing power disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple current sensors are installed in each distributed power source to detect reverse power flow, then the reverse power flow detection capability is improved, but the system cost and structural complexity increase
Solution Approach 1:
The patent merges the current sensing function from multiple distributed power sources into a single current sensor installed at the grid connection point. The controller integrates current values from all power sources and calculates total output power to detect reverse power flow, eliminating the need for multiple individual current sensors while maintaining detection capability.
Solution Approach 2:
The controller acts as an intermediary that receives current values from all distributed power sources, processes this information centrally, and determines the total output power. This intermediary approach allows centralized processing of distributed measurements, achieving system-level monitoring without requiring each component to have full sensing capability.
2Measurement precision
If multiple current sensors are installed in each distributed power source, then the reverse power flow detection capability is improved, but the installation space requirements and cost increase
Solution Approach 1:
The patent consolidates multiple current sensing functions into a single physical sensor location at the grid connection point. By combining the sensing resources, the system reduces the total installation space required while maintaining the ability to monitor all distributed power sources through centralized current value integration and total output power calculation.
3Reliability
If all power generation apparatuses control to reduce respective power outputs upon reverse power flow detection, then the reverse power flow is prevented, but a temporary sharp decrease in power supply occurs
Solution Approach 1:
The patent implements dynamic control where the controller calculates target output power for each distributed power source based on the current value and total output power, then notifies each power source of its specific target power. This dynamic, differentiated control approach allows gradual adjustment of power outputs rather than simultaneous reduction, preventing reverse power flow while maintaining power supply stability.
Solution Approach 2:
The controller continuously monitors current values from all distributed power sources, calculates the total output power, compares it with the current value to detect reverse power flow conditions, and adjusts target output power notifications accordingly. This closed-loop feedback mechanism enables proactive power output management that prevents reverse power flow while maintaining stable power supply.
Data Source
AI summary
A control method of the power generation system of the disclosure is a control method of a power generation system configured with a power generation apparatus and at least one other power generation apparatus coupled to the power generation apparatus herein, the power generation system configured to interconnect with a grid and supply power to a load, wherein a process performed by the power generation apparatus includes a step of obtaining a current value between the power generation system and the grid, a step of determining, based on the current value, respective target power to be generated by the power generation apparatuses, and the other power generation apparatuses, and a step of notifying the other power generation apparatuses of the respective target power.