High-reliability substation automation system and control method for EPA (Ethernet for plant automation)-based flat network architecture

Abstract

The invention discloses a high-reliability substation automation system and a control method for an EPA (Ethernet for plant automation)-based flat network architecture. The system consists of a substation spacer layer and a process layer. Multi-function intelligent electronic devices (MIEDs) with different communication standards can be directly connected to EPA and transmit network data by supporting the EPA of different mainstream physical / data link layer protocols; and an EPA network improves the reliability and maintainability of the substation automation system by adopting redundancy designs and different retransmission strategies. The MIEDs adopt hard logic gate control of DSP (a digital signal processor)+ ARM (an advanced RISC machine) + CPLD (a complex programmable logic device) and multi-machine collaborative architectures, and have the advantages of high-efficient, reliable and stable parallel communication. Multi-layer wavelet transformation is carried out by a wavelet transform algorithm by aiming at the condition that strong electromagnetism / surge interference is superposed in substation site signals, so true values of the substation site signals without interference are acquired. A high-reliability switching value output circuit and a PCB (printed circuit board) device double-socket circuit of the MIEDs isolate strong current return circuits from weak current return circuits, so that the high reliability of the substation automation system is facilitated.

Description

technical field [0001] The invention belongs to the technical category of substation automation systems in the electric power industry, and in particular refers to a highly reliable substation automation system and a control method based on an EPA flat network architecture. Background technique [0002] Substations are responsible for the conversion and distribution of electric energy, and play a pivotal role in the safe and economical operation of the power grid. With the continuous increase of my country's economic aggregate, the scale and structural complexity of the power grid continue to increase, leading to unprecedented challenges to the reliability of the substation automation system; and the promotion of unattended substation management mode has further aggravated the substation automation system. The urgency of high system reliability. On July 1, 2009, "DL Electric Power Industry Standard of the People's Republic of China (DL / T1146-2009): DL / T860 Implementation Tec...

AI Technical Summary

Problems solved by technology

During the operation of the substation, strong electromagnetic / surge interference and inevitable system oscillation will be generated, which will lead to the distortion of the sampling value input by the automation system, and then cause the protection and control error of the output of the automation system; The treatment of surge interference is not ideal, while the wavelet transform has higher time resolution and lower frequency resolution in the high frequency part, and has excellent characteristics of higher frequency resolution and lower time resolution in the low frequency part , is a good method to replace Fourier transform to deal with strong electromagnetic / surge interference

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