HVDC trend is increasing day by day due to its technical advantages over AC like long distance bulk power transmission, asynchronous integration of AC systems etc. One of the important applications of HVDC is bulk power wind energy transmission from offshore to onshore grid. This paper provides present complete individual technical data of HVDC links of both Bi-polar and Back-to-back transmissions projects commissioned in India.
Electric power system is one of the most complex man made systems. Voltage stability is the one of the instabilities among the various types of instabilities experienced by electri power systems. With the development of the technology, different types of loads with different load densities are increasing in the power system. As a result, it is necessary to assess the effectiveness of the various procedures used to monitor the power systems. In this paper a study is proposed to analyze the effect of different types of load variations on voltage stability monitoring indices. It is considered to carry out the studies on IEEE 14 and IEEE 30 bus test systems.
This paper intends to detect the inter-turn fault by performing impulse test on HVDC Converter transformer by Coherence Function method. The inter-turn in a transformer (due to insulation failure) is located in impulse test by neutral current method. In the neutral current method, a record of the impulse current flowing through a resistive shunt between the neutral and ground point is used for detecting the fault. Neutral current so measured or calculated is in time domain. Theoretically the calculated neutral current, both for healthy winding and turn-fault winding is subjected to FFT to convert time domain into frequency domain of real and imaginary values. The real and imaginary values are used to calculate the coherence function. Coherence function compares both with and without fault neutral current in frequency domain, so that fault can be identified. Coherence function compares input and output at each frequency.It displays output i.e coherence value as 1 if input and output at that frequency is same other wise less than 1. 1 indicates that there is no fault at that frequency and decreasing coherence value (<1) indicates fault at that frequency.
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