Single-Phase and Three-Phase Inverters
From Renewable Energies
Single-phase and three-phase inverters for PV grid-connected and off-grid systems. INVERSIN Inverters for photovoltaic applications can be used either in stand-alone systems or grid-connected systems. The models initially designed under INVERSIN system are:
Products Details
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INVERSIN model M2.5: 2.5 kW single-phase Inverter.
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INVERSIN model T5.0: 5.0 kW three-phase Inverter.
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INVERSIN model T25.0: 25.0 kW three-phase Inverter.
The advantage of using three-phase inverters compared to single-phase is that the power of an equilibrated three-phase system is stationary, which saves the number of capacitors needed in a single-phase inverter.
The M2.5 and T5.0 Inverters have been designed for up to 5 kW photovoltaic applications in order to get the electricity tariff of 0.40 € per kWh in the Spanish utility for installations up to this power.
For this purpose, two 2.5 kW inverters (INVERSINE M2.5) are required for single-phase installations and only one 5.0 kW inverter (INVERSINE T5.0) in the case of three-phase installations.
The 25kW three-phase inverter (INVERSIN T25.0) is a product for bigger photovoltaic installations, which are starting to be an important sector in the energy field.
The main characteristics of the inverters compared to inverters available in the market are:
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Multiple DC voltage array input with individual MPP (Maximum Power Point) tracking in each PV array connected. This important since:
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It makes it possible to make different configurations of PV modules, even from different PV manufactures or brands, saving labour and installation costs for the PV system.
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It makes it possible to increases the number of PV modules connected to the inverter without having to change the inverter due to its input DC voltage characteristics. This is of great importance in installations that are performed in different phases, allowing grid injection once the first array is connected, not needing to wait until the whole system is connected.
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It avoids important energy drops or even that the inverter stops working when partial shadows or damage PV modules occur. If a shadow or a malfunction PV module happens, the rest of the arrays keep working at maximum power.
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The injected energy from each PV array can be checked through a display. This allows detecting where a problem in the system may be happen (shadows, PV module malfunction, connection problems, dirty modules, etc.). The display can be trimmed in such a way that it shows the relative power produced in each array with regards to its maximum power, making it a user friendly interface to the end user or the installer.
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The single-phase inverters use less electrolytic capacitors than other inverters found in the market, making then work with a high voltage ripple. This reduces manufacturing costs. Capacitors are needed in single-phase inverters due to the pulsar nature of the injected power.
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They use last generation semiconductors technology, reducing commutation losses and increasing the efficiency of the system.
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The efficiency is over 90% in the low power range. This is a quality not found in market inverters, where the efficiency value is rated to their nominal power or maximum efficiency.
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Fast MPP tracking, which decreases power losses and is essential for the accurate sun tracking system of the two-axis sun tracking system TETRA-TRACK. The advanced accuracy tracking systems device is essential for the future development of medium to high concentration PV modules where tracking accuracy below 0.1º is required.
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Harmonic distortion below 1% within a dynamic range greater than 100/1.
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