This paper proposes a multiagent-based adaptive wide-area current differential protection system. A power grid is divided into primary and backup protection zones dynamically online with the help of a developed expert system, and the relay agents of these zones cooperate to perform a differential relaying function. Predictive self-healing strategies have… (More)
Grasping system dynamic information is helpful for dispatcher in control center to take correct control action in time under emergency condition. Wide Area Measurement Systems (WAMS) has been viewed as an ideal system to monitor power systems since it can provide comprehensive profile and dynamic behavior of the power systems. Whereas, for its demanding… (More)
The voltage instability phenomena occur in both transmission systems and distribution systems. The weakening of voltage stability level will limit the growth of load served by distribution companies. Voltage instability in power distribution systems could lead to voltage collapse and thus power blackouts. The integration of distributed generation (DG) in… (More)
The rapid growth of Internet applications has made communication anonymity an increasingly important or even indispensable security requirement. Onion routing has been employed as an infrastructure for anonymous communication over a public network, which provides anonymous connections that are strongly resistant to both eavesdropping and traffic analysis.… (More)
Direct Digital Synthesizer has become the first choice for the signal generator in modern electronic devices. But the spur prevents it from replacing traditional frequency synthesizer completely. This paper introduces a new frequency source, conjoining Sigma Delta and CORDIC, to produce high-resolution and low spur analog wave-forms. With phase noise as low… (More)
This paper describes a risk-based approach for multi-objective maintenance schedule of transmission line. A novel risk index is calculated by probabilistic load flow method, which accounts for the fluctuation of generator power, loads and transmission line's outages. Elitist non-dominated sorting genetic algorithm (NSGA-II) is used to find the optimal… (More)
In Substation Automation System (SAS) using IEC 61850 protocol, protection system is facing with risk of mis-operation due to mal-function of Electronics Instrument Transducers (EITs). A rule based approach is proposed in the letter to facilitate a fault tolerant protection system. Numerical simulation shows the effectiveness of the proposed approach.