关键词: 智能电表, 隐私保护, 数据扰动, 非侵入式负载监测（NILM）

Abstract: Existing privacy preserving mechanisms for smart meter are still faced with the problem of insufficient protection for consumer power consumption mode, the temporal perturbation to destroy the raw power waveform is proposed, and a time-disturbed smart meter privacy protection model based on the data availability is derived，which can achieve the compromise between data availability and privacy security. Besides, a non-intrusive load monitoring algorithm as a testing method to evaluate the security performance of the scheme has been carried out. The experimental results show that the temporal perturbation based privacy-preserving method can effectively reduce the recognition accuracy of electrical appliances, achieve better suppression efficiency compared with random perturbation and rechargeable battery, keep the aggregation error of multi-user stabilized around 10%, and perform well in billing measurement.

Key words: smart meter, private preserving, data perturbation, Non-Intrusive Load Monitoring（NILM）