Method for detecting network asymmetrical status and asymmetrical communication channels for power system
AssigneeABB Research Ltd.
InventorsYouyi Li, Bin Su
Life of this patent
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Abstract
The present invention provides a new synchronization method named Multi-Node Echo Method (MNEM), which settles the problem of clock/data synchronization with asymmetrical channels. In MNEM, the echo messages are relayed among multi-node loop both by clockwise and anti-clockwise. Based on Multi-Node Echo Method, the invention further provides a method to detect symmetrical status of a communication network, a method to detect asymmetrical status of any channel in a communication network, and a method to calculate the sending and receiving delay values of any channel in a communication network, even when the channel is asymmetrical.
Claims6
A method for detecting an asymmetrical status of a communication network with at least three nodes for a power system, comprising:
- selecting a set of echo loops, wherein the set of echo loops is selected by covering all the existing communication channels in the network;
- employing a multi-node echo approach for each echo loop in the set of the echo loops by transmitting echo messages in both clockwise and anti-clockwise direction through the echo loops;
- detecting and comparing each echo loop's clockwise delay and anti-clockwise delay;
- wherein if each pair of the clockwise delay and the anti-clockwise delay are equal, the whole network is in symmetrical status;
- otherwise, the network is in asymmetrical status.
A method for detecting an asymmetrical status of a channel in a communication network with at least three nodes for a power system, comprising:
- selecting two multi-node echo loops, both including the channel;
- employing a multi-node echo approach for each of the two multi-node echo loops by transmitting echo messages in both clockwise and anti-clockwise direction through the two multi-node echo loops;
- detecting and comparing each of the two multi-node echo loop's clockwise delay and anti-clockwise delay;
- wherein if both pairs of the clockwise delay and the anti-clockwise delay are unequal, a common channel of the two multi-node echo loops is asymmetrical;
- otherwise, the common channel of the two multi-node echo loops is symmetrical.
Dependencies are inferred from the claim text.