4 research outputs found

    Solid state transformer parallel operation with a tap changing line frequency transformer

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    Increase in load demand require upgrade of distribution transformers and significant investments. An alternative to a complete overhaul of the distribution transformer is to operate a solid state transformer in parallel with the line frequency transformer. This allows functionality to either share the load or accommodate overload conditions. In addition, other options for superior distribution system voltage control may be present. This paper focuses on the parallel operation and control strategy for a 33 kV/415 V, 200 kVA distribution transformer with a 200 kVA parallel solid state transformer. Two control strategies, namely parallel load sharing operation and overload accommodation are investigated. Simulation results are presented for the parallel operation of a SST with a LFT and the effectiveness of the two strategies are discussed

    Static performance comparison of prominent synchrophasor algorithms

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    Synchrophasor technology has become a prominent wide area measurement technique in the recent years. Development of robust synchrophasor estimation algorithms has been one of the key focus areas in the field of synchrophasor. However, there is a lack of performance comparison studies of these algorithms. Furthermore, the majority of existing studies are limited to simulation-based performance evaluation. This paper analyses the steady-state performance of three prominent synchrophasor estimation algorithms in simulations and hardware platforms. Results show that the performance of synchrophasor algorithms significantly vary based on the test case. Improvements to the synchrophasor estimation algorithms are also proposed and discussed in the paper

    A Modified Lyapunov Exponent based Approach for Real-Time Voltage Stability Assessment Using PMUs

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    Real-time voltage stability assessment is a key requisite in modern power networks equipped with renewable distributed generation sources and complex loads. Synchrophasor technology has become a prominent WAMS technology and has gained increasing popularity due to limitations in conventional SCADA systems. This study discusses the end to end process of real-time voltage stability assessment by using a PMU network. Evaluation of largest Lyapunov exponent is identified as an efficient method of determining the real-time stability by performing several dynamic test cases

    PWM DAC based Input System for Synchrophasor Algorithm Testing

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    Synchrophasor technology is an emerging wide-area monitoring system (WAMS) technology that provides near-real-time stability assessment capability for power networks under both static state and dynamic conditions. The accuracy and latency of the measured synchrophasor directly depend on the synchrophasor assessment algorithm and thus, many research studies are conducted by developing a plethora of synchrophasor algorithms based on several mathematical models. However, majority of these algorithms are tested on simulation platforms due to the inherent complexities in developing a hardware based comprehensive test set-up for synchrophasor performance evaluation, which limits the adoption of such algorithms in industrial applications. This study presents a pulse-width modulation (PWM) based laboratory scale input system for generating all the synchrophasor test cases defined in the IEEE std. C37.118.1/1a.\mathrm {C}37.118.1/1\mathrm {a}. Performance of the proposed system is validated by rigorous testing across several test cases and comparison of results in both simulation and hardware platforms
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