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The penetration of distributed generations (DGs) in distribution system has been steadily increasing. This paper develops and tests a three-phase-based state estimation algorithm for distribution system with DGs. This algorithm is based on branch currents. The amplitudes and phase angles of branch currents are selected as state variables. A proper change of measurements enables the three-phase distribution...
This paper proposes a two-level hybrid state estimation method for power systems with SCADA and PMU measurements. A power system is decoupled into PMU observed areas and SCADA observed areas based on its system measurement configuration and topology connectivity, and the states of areas are solved by a two-level computational procedure. The first level uses PMU measurements and pseudo measurements...
It is an effective approach to ensure the non-exceeding of the breaking capacity by adopting fault current limiter to restrain short-circuit current. Considering a persistent increase of the short-circuit current level in power grid, a kind of resonant fault current limiter is proposed. The appropriate parameters are selected for the electromagnetic transient simulation analysis on the resonant fault...
This paper presents a novel coordinated algorithm, Fast Distributed State Estimation with Linear Coordination (FDSELC), considering Phasor Measurement Units (PMUs) measurements at both subsystem and coordination levels. At the subsystem level, the estimators apply augmented Fast Decoupled State Estimation algorithm to reduce the computational time at the first step. At the coordination level, linear...
Along with the development and construction of smart grid and smart substation, the research on the electronic current transformer develops deeply. In order to achieve the measuring requirements of high accuracy and broad range, a new design of combined electronic transformer is proposed in this paper based on the analysis of current technology; the waveform smooth algorithm is adopted to solve the...
With the rapid development of the Smart Power Bulk Transmission Systems, single-core power cables above 110 kV are used more and more widely. The circulating current, generated on the cable metal sheath, brings additional loss to the cable metal sheath and makes cable safe operation life shortened. This paper studied and analyzed how circulating current on the metal sheath of single-core cables varied...
For large-scale photovoltaic power station connected to medium-voltage grid, it is not proper to evaluate its power quality by traditional limitation in China. In this paper, it proposes testing technology and research in order to evaluate the power quality for large-scale photovoltaic power station according to latest photovoltaic standards. The tests will focus on flicker, harmonics, inter-harmonics...
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