Compatibility analysis of grid-connected pico-hydro systems using conventional photovoltaic inverters

Leite, Vicente; Ferreira, Ângela; Couto, Jose; Batista, José

doi:10.1109/epe.2016.7695615

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…Finally, the rated current of the generator must be equal to or less than I DCmax . Moreover, a current greater than P DCmax /V DCmax is recommended to ensure that the inverter will be able to process the available power without overloading the generator [11].…”

Section: Overvoltage Protection 21 Integration Of Generator and Pv Imentioning

confidence: 99%

“…Another important feature in PV inverters is their maximum power point tracking (MPPT) algorithm, which is the selection of a point of operation where the current and voltage pair allows the process of maximum power available from the connected power source. Unlike PV modules, generators have their maximum power point when their current approaches their rated value I G DCrated [11].…”

Section: Overvoltage Protection 21 Integration Of Generator and Pv Imentioning

confidence: 99%

“…If the speed and, consequently, the power increase to "Speed 9", the operating point is defined by point 3 and does not exceed this value, because at that point the protection comes into action and the excess energy is dissipated in the auxiliary resistor. In contrast, if the power and speed decrease to "Speed 1", the inverter operates at point 4, where there is the minimum voltage for which it can operate [11].…”

Section: Overvoltage Protection 21 Integration Of Generator and Pv Imentioning

confidence: 99%

“…Their combination with a permanent magnet synchronous generator (PMSG) is an alternative for energy generation. Although PV inverters have been created to operate with PV modules, a PMSG and a bridge rectifier can be used as DC source, instead of those modules [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…These situations can happen in case of over-power, or whenever the generator is under no load, e.g. during grid synchronization or when the grid fails [11].…”

Section: Introductionmentioning

confidence: 99%

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Overvoltage protection for grid-connected picohydro generation using photovoltaic inverters

Scotta

Maidana

Leite

2020

redin

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Very small-scale hydropower plants are environmentally friendly and renewable resource-based innovative solutions. The interest in pico-hydro systems (up to 5 kW) has increased significantly from the first stand-alone applications, at remote sites, to the distributed generation, with the injection of generated energy into the grid. Recently, there have been advances in the grid connection of these systems using off-the-shelf components, namely photovoltaic inverters. Therefore, pico-hydro systems have gained an enormous potential in distributed generation, particularly in the context of microgrids. However, in situations of over-power, or whenever the generator is under no load, e.g. when the grid fails, there is a need for effective over-voltage protection, as in small wind turbines. This paper proposes two over-voltage protection circuits, designed to ensure the integration of pico-hydro turbines connected to the grid using conventional photovoltaic microinverters and string inverters, for power ranges of 300 W and some kW, respectively. Extensive tests were performed on an emulation platform and a workbench using these two different over-voltage protection circuits. One is designed to connect the generators of water wheels to the grid and the other to connect 1500 W generators of water turbines. The experimental results demonstrated the performance of the proposed over-voltage protection circuits in four different situations. Both avoid irreversible damages of generators, photovoltaic microinverters and string inverters in the context of the above-described grid connection approach.

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Section: Overvoltage Protection 21 Integration Of Generator and Pv Imentioning

confidence: 99%

Section: Overvoltage Protection 21 Integration Of Generator and Pv Imentioning

confidence: 99%

Section: Overvoltage Protection 21 Integration Of Generator and Pv Imentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…These situations can happen in case of over-power, or whenever the generator is under no load, e.g. during grid synchronization or when the grid fails [11].…”

Section: Introductionmentioning

confidence: 99%

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