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Real-time monitoring tools and their optimal measurement infrastructure are expected to play a critical role in smart grid applications. These applications require greater measurement precision and speed, which is not possible with conventional measurement devices. Due to their high economic burden and superseded technology, transmission level phasor measurement units (PMUs) are inappropriate for unbalanced active distribution networks (ADNs). Micro-synchrophasor technology is faster, less expensive with tighter accuracy tolerances. However, large-scale implementation of real-time monitoring instrumentation is economically unfeasible due to the size of ADNs, and successful deployment requires a new meter placement approach. In this paper, a micro-phasor measurement unit ($\mu $ PMU or micro-PMU) placement technique is proposed considering the unique traits of ADNs, which establishes a new concept of usable zero-injection phase strings (UZIP Strings). The method is evaluated using the IEEE-13, IEEE-34, and IEEE-123 node distribution test feeders. The fidelity of the placement algorithm is further verified via a fault detection and localization study. The results indicate better performance than previous literature with minor placement variations between deterministic and meta-heuristic algorithms for the presented holistic and UZIP String reduction methods. [ABSTRACT FROM AUTHOR]

This paper presents a wide-area control approach to improve the transient stability of the power systems while also damping the post-fault inter-area oscillations. The proposed approach employs a nonlinear Kalman filter to estimate the inter-area modes using phasor measurement units (PMUs). The wide-area control system then uses the estimated inter-area dynamics through the developed control algorithms to improve the first swing and damping stability of the system. The performance of the proposed approach is evaluated on the simplified Australian test system with different load models including induction motors and the results show significant improvement in the stability of the system by simply adding the wide-area control signals to the available controllers in the system. The application of the proposed wide-area control system is shown to be feasible on realistic systems by improving the system stability and efficiency. [ABSTRACT FROM PUBLISHER]