Multi-Inverter Current Transmission Using Relay Data Compression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for driving motors with multiple inverters face delays in transmitting output current vectors as the number of inverters increases, necessitating a solution for high-speed transmission of state quantities.
Innovation Solution
An electric power conversion device comprising a main controller, subcontrollers, and a relay unit that compresses and transmits state quantity information efficiently, allowing high-speed communication among multiple inverters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of inverters is increased to handle larger loads, then the power conversion capacity is improved, but the time to transmit output current vectors increases causing communication delays
Solution Approach 1:
The system segments the transmission of state quantities by introducing a relay unit that divides the network into zones. Each relay unit collects state quantities from multiple inverters within its zone, compresses this data, and transmits it to the main controller. This segmentation reduces the total transmission time by processing data in distributed zones rather than requiring all inverters to communicate directly with the main controller simultaneously.
Solution Approach 2:
The relay unit acts as an intermediary between the inverters and the main controller. It receives state quantities from multiple inverters, performs compression processing, and then transmits the compressed data to the main controller. This intermediary role enables efficient data aggregation and reduces the communication burden on the main controller, thereby reducing overall transmission time while supporting a larger number of inverters.
2Measurement precision
If all state quantity information from multiple inverters is transmitted to the main controller, then the control accuracy is improved, but the communication load and transmission time increase
Solution Approach 1:
The relay unit extracts only the essential state quantity information from the data received from multiple inverters through compression processing. Instead of transmitting all raw data, the system extracts and transmits only the necessary control information to the main controller. This extraction process maintains control accuracy by preserving critical data while removing redundant information, thereby improving transmission efficiency.
Solution Approach 2:
The system changes the parameter of data representation by compressing state quantity information at the relay unit. The compression transforms the original high-volume data into a more compact form that retains the essential control information. This parameter change in data format reduces the communication load and transmission time while maintaining the accuracy needed for effective feedback control.
Data Source
AI summary
To provide an electric power conversion device that carries out high-speed transmission of current values of a plurality of inverters, and a control method for the electric power conversion device. The electric power conversion device includes a main controller, a plurality of subcontrollers, and a relay unit. The main controller generates and outputs a control command that is a target value for controlling electric power conversion carried out by a plurality of electric power conversion units that supply and receive power to and from a load based on state quantity information related to a state quantity of each of the plurality of electric power conversion units. The subcontrollers are provided for each of the electric power conversion units to control the electric power conversion units based on the control command and to acquire and output the state quantities. The relay unit compresses information of the state quantities output from subcontrollers.