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Multi-core or many-core machines become increasingly pervasive. Parallel simulation can achieve high efficiency by employing multi-threaded parallel execution of models and fast inter-thread communication between models. However, load imbalance among cores degrades performance of the simulation system greatly. This is especially true for simulation of variable structure systems, due to dynamic addition...
This paper describes a new fault diagnosis method for power systems that is based on a hierarchical model and the equivalent-input-disturbance (EID) approach. First, a hierarchical model describing the system is built. Next, an EID estimator is designed for each submodel in each layer. Then, the estimators are used to carry out fault diagnosis from the top down. Unlike conventional methods of fault...
This paper proposes a combined Secondary and Tertiary Voltage Regulation (SVR+TVR) methodology based on real-time optimal power flows (OPFs) to periodically update the generators' voltage regulator set points. Minimum active power losses (MAPL) and maximum loadability (ML) OPF approaches are used for the proposed SVR+TVR control. The presented technique is compared against a “classical” SVR control,...
Unified power flow controller (UPFC) is one of the most advanced flexible AC transmission system (FACTS) devices that can simultaneously and independently control both the real and reactive power flow in a transmission line. The utilization of UPFC can result in significant reliability benefits in modern power systems. This paper proposes a novel reliability network model for a UPFC, which incorporates...
This paper deals with the comparison between an optimal coordinated voltage control (OCVC) and secondary voltage control (SVC) for long-term voltage stability enhancement. OCVC model in this paper is based on quasi-steady-state (QSS) approximation, including continuous and discrete time differential-algebraic equations (DAEs). This model considers long-term voltage stability and costs of controls...
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