Low delay intelligent substation wireless communication mechanism

Abstract

The invention discloses a low delay intelligent substation wireless communication mechanism. The problem that message transmission delay is instable in an intelligent substation wireless network is mainly solved. The scheme comprises the fact that through utilization of a TDMA protocol, according to SV (Sampled Value) and GOOSE (Generic Object Oriented Substation Event) periodic business requirements of a substation, fixed time slots are allocated to all nodes in a communication network based on a periodic fair allocation method; and when leisure occurs in the fixedly allocated time slots, through utilization of a CSMA/CA protocol and through importing of message priorities, and channels are competed for sudden business such as barring business or other uncertain business. The invention provides a wireless communication mechanism for intelligent substation equipment. According to the low delay intelligent substation wireless communication mechanism based on TDMA and CSMA/CA mixture, delay stability of periodic messages in the intelligent substation wireless network is ensured, transmission of sudden messages is ensured, and a channel utilization rate is improved.

Description

technical field [0001] The invention belongs to the communication field, and in particular relates to a low-delay smart substation wireless communication mechanism, which is suitable for smart substation wireless networking scenarios, allocates time slots according to substation message conditions, and ensures stable time delay requirements. Background technique [0002] The smart substation based on the IEC61850 standard mainly transmits GOOSE (Generic Object Oriented Substation Event) messages, SV (Sampled Value, transmission sampling) messages and MMS (Manufacturing Message Specification) messages. According to the message types, there are periodic messages, burst messages, and random messages, among which more than 90% of the periodic messages are real-time messages. The messages transmitted between the secondary equipment of the substation have a clear subscription relationship, and the maximum transmission rate of data messages must reach 250kbit / s. [0003] The trans...

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Problems solved by technology

[0004] At present, the smart substation mainly adopts the Ethernet communication technology based on the CSMA/CD mechanism because it can provide high-speed and stable data transmission. The relay protection equipment is placed close to the primary equipment. After the decentralized installation, the installation and commissioning work of the Ethernet communication based on the CSMA/CD mechanism will be greatly increased.

The ZigBee wireless communication technology based on the CSMA/CA mechanism is mostly used in wireless temperature measurement and wireless monitoring of smart substations, but ZigBee is a low-power, low-speed wireless network technology, which is not suitable for the transmission of SV and GOOSE messages

The Wi-Fi wireless communication technology based on the CSMA/CA mechanism is mainly used in the transmission of data packets in smart substations. At present, it is mainly in the research stage at home and abroad. The Wi-Fi communication technology based on the CSMA/CA mechanism can facilitate various The flexible access of services can effectively reduce the probability of conflicting transmissions. This mechanism adopts a random backoff method. However, when the number of nodes is large and the traffic volume is large, the throughp...

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