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Low-voltage Ride-through Operation Of Grid Interfaced Solar Energy Conversion System
Project Description :

The grids of developing and underdeveloped countries are generally weak, unreliable, and have a poor power quality. therefore, an integration of renewable energy to the grid is facing extra challenges, apart from usual challenges under distorted grid voltages, under voltages and over voltages. the grid interfaced solar photovoltaic (pv) array system coupled voltage source converter (vsc), supplies power to the local loads and rest of power to the distribution grid. in the conventional grid-connected solar energy conversion system (secs), vsc currents are greatly increased and tend to exceed the current rating of the insulated gate bi-polar transistors (igbts), which are blown out and damage the whole secs due to any balanced/unbalanced fault in the distribution grid. therefore, conventional grid interfaced solar pv array system is isolated from the grid under any undesirable situations in the grid. hence, solar pv array system faces the loss of revenue as it fails to deliver power to the distribution grid otherwise it will damage the vsc under any faults. however, as per revised grid code ieee-1547.4 standard and indian grid code, a solar pv array system should remain connected to the grid even under balanced/unbalanced fault and should assist the grid to maintain the grid voltages by supplying the reactive power to the distribution grid. the concept of ride-through operation of secs is proposed here to satisfy ieee and indian grid code without damaging vsc (the typical cost of vsc with 25 kva rating is 60,000 rupees) and assists grid to maintain point of common coupling voltage, which reduces the burden on nearest substations as reactive power is locally supplied by secs. moreover, the proposed concept of ride-through reduces the total harmonic distortions (thds) of the grid currents within 5% as per the ieee-519 standard. the ride-through operation is ensured without compromising the grid harmonic-currents elimination and grid-currents balancing and distribution static compensator (dstatcom) features, even during the harmonic/distorted grid voltages. the ieee standard-1547.4 compels the distributed resource to ride-through during voltage disturbances caused by faults. for the ride-through operation, a limit is imposed on pv active power injection to prevent inverter over-currents and dc-link energy aggregation, which reduces the lifetime of the dc-link capacitor. the reactive power is fed to the grid, as per the depth in voltage-sag. the de-rated pv array power is supplied in cases where the inverter cannot handle the utmost pv-power. in distribution network with modern nonlinear loads, especially at far radial ends, the grid voltages are prone to huge diversions and the proposed controller provides a possible solution to address the grid voltage unbalances and distortions without compromising different power quality improvement features. to validate the effectiveness of the proposed concept, a prototype is developed in the laboratory and tested for various perturbations such as load currents unbalancing, variations in local loads, variation of solar irradiations, dstatcom to secs mode, secs to dstatcom mode, distorted grid voltages and single line to ground fault (unbalanced fault). the experimental results demonstrate satisfactory performance under all aforementioned scenarios. the aforementioned concept of ride-through operation for secs provides the best solution without restructuring already installed secs to deliver the multifunctional features described above, as per ieee revised grid codes.

 
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Project Details :
  • Date : Nov 16,2019
  • Innovator : Priyank Mukeshkumar Shah
  • Team Members : V L Srinivas,Prof. Bhim Singh,Prof. Sukumar Mishra,Priyank Mukeshkumar Shah
  • Guide Name : Prof. Bhim Singh And Prof. Sukumar Mishra
  • University : Indian Institutes of Technology Delhi
  • Submission Year : 2020
  • Category : Electrical, Instrumentation & Related Fields
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