Inverter Control System Dynamic Load Matching
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Solution Overview
Problem
Large capacity inverter systems face inefficiencies due to excessive operation of all inverters even during low power requirements, leading to low system operation efficiency and increased power loss, as all inverters are driven regardless of the actual power needed, resulting in excessive system load and reduced power conversion efficiency.
Innovation Solution
A method for controlling an inverter system that selectively determines and drives only the necessary number of inverters based on the target power requirement, comparing the target power with the power supplied by a predetermined number of inverters and adjusting the number of active inverters to optimize power conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If all inverters are operated in parallel to supply sufficient power, then the power supply capacity is ensured, but the system operation efficiency is lowered due to excessive inverters being driven
Solution Approach 1:
The inverter system dynamically adjusts the number of active inverters based on the target power requirement. The control method determines the appropriate number of inverters to operate by comparing target power with available power from different combinations of inverters, enabling the system to adapt its configuration to match actual power demands rather than operating all inverters statically.
Solution Approach 2:
The system changes the operational parameters by varying the number of active inverters based on power requirements. By adjusting this key parameter (number of active inverters), the system optimizes the balance between power supply capacity and operational efficiency, selecting the minimum necessary number of inverters to meet the target power while minimizing energy losses.
2Power
If all inverters are driven to meet maximum power requirements, then the maximum power output is achieved, but power loss increases due to excessive system load
Solution Approach 1:
The system applies partial action by operating only the necessary number of inverters rather than all inverters. By determining the minimum number of inverters required to meet the target power and operating only that many, the system avoids the excessive action of running all inverters, thereby reducing power loss while still achieving the required power output.
3Ease of operation
If a fixed number of inverters are operated regardless of power demand, then the system operation is simplified, but power conversion efficiency is reduced due to mismatched inverter count
Solution Approach 1:
The control method implements feedback by continuously comparing the target power with the power that can be supplied by different numbers of inverters. Based on this feedback comparison, the system determines the optimal number of inverters to operate, creating a closed-loop control system that adjusts inverter operation to match actual power demands, thereby improving power conversion efficiency while maintaining operational simplicity through automated decision-making.
Data Source
AI summary
The present invention relates to a method for controlling an inverter system including a plurality of inverters connected in parallel. The method includes: comparing a target power amount with an amount of power to be supplied by the predetermined number of inverters; determining the number of inverters to be driven, based on a result of the comparison; and supplying the final output power to an AC power system by driving inverters by the determined number of inverters.