MMC Wireless Channel Allocation for Collision-Free Communication
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Solution Overview
Problem
Existing wireless communication methods in modular multilevel converter (MMC) systems face issues with signal collisions and prolonged communication cycles due to non-uniform transmission waiting times among wireless devices, leading to inefficient data transmission and extended communication cycles.
Innovation Solution
Implementing a wireless communication method that divides wireless nodes into groups, allocating multiple channels using a first multiple access method and further subdividing these channels into subchannels using a second multiple access method, allowing simultaneous and efficient communication between a control protection device and submodules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wireless communication is used to reduce costs, then communication cost is reduced, but signal collision occurs leading to deterioration in communication efficiency
Solution Approach 1:
The patent segments the communication resources by dividing channels into multiple groups and further dividing each channel into multiple subchannels. This segmentation allows different wireless nodes to transmit simultaneously on different subchannels without signal collision, thereby maintaining communication efficiency while using cost-effective wireless communication.
Solution Approach 2:
The patent introduces an additional dimension to channel division by creating subchannels within each channel. This dimensional expansion provides more granular resource allocation, enabling finer control over simultaneous transmissions and effectively preventing signal collisions in the wireless communication system.
2Reliability
If transmission waiting time is extended to avoid signal collision, then signal collision is avoided, but communication cycle becomes longer
Solution Approach 1:
By segmenting channels into multiple subchannels, the patent enables multiple nodes to transmit simultaneously without collision. This eliminates the need for extended waiting times, as each node can find an available subchannel for immediate transmission, thus reducing communication cycle while maintaining reliability.
Solution Approach 2:
The patent enables continuous useful action by allowing multiple nodes to transmit data simultaneously on different subchannels. This parallel transmission capability ensures that communication resources are continuously utilized without idle waiting periods, reducing overall communication cycle while preventing signal collisions.
3Ease of operation
If uniform communication frequency is used among wireless devices, then communication coordination is simplified, but transmission waiting time becomes non-uniform leading to extended communication cycle
Solution Approach 1:
The patent segments each communication channel into multiple subchannels, allowing wireless devices to transmit on different subchannels simultaneously. This segmentation resolves the conflict between simplified coordination (uniform frequency) and reduced waiting time, as devices maintain uniform frequency while avoiding collisions through subchannel differentiation.
Solution Approach 2:
The patent adds another dimension to frequency coordination by introducing subchannel division. This allows the system to maintain uniform communication frequencies for simplicity while adding a subchannel dimension that enables simultaneous transmissions, thereby reducing communication cycle without complicating the frequency coordination mechanism.
Data Source
AI summary
In a power conversion device, a plurality of channels of a first multiple access method are respectively allocated to a plurality of groups. A plurality of subchannels of a second multiple access method which are divisions of a corresponding channel of the first multiple access method are respectively allocated to a plurality of wireless nodes included in each of the plurality of groups. A first transmitter of each wireless node transmits individual information received from a connected submodule to a second receiver of a control protection device via an allocated channel and subchannel. A second transmitter of the control protection device simultaneously transmits a common control protection command to respective first receivers of the plurality of wireless nodes via a channel that is different from the plurality of channels of the first multiple access method.