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New reactive power inverter (not only) for PV systems. – The blueplanet 50.0 TL3 RPonly from KACO new energy serves yield protection in solar parks and grid management.

10-11-2017 12:22 PM CET | Energy & Environment

Press release from: KACO new energy GmbH

Reactive power for a stable grid: the blueplanet 50.0 TL3 RPonly.

Reactive power for a stable grid: the blueplanet 50.0 TL3 RPonly.

Neckarsulm, 11. October 2017 – In order to support grid stability, German PV specialist KACO new energy introduces the blueplanet 50.0 TL3 RPonly. This unit can feed in reactive power at any time in order to maintain the grid voltage in the specified tolerance range – a key contribution to grid management. To date, no other manufacturer is taking this approach using a stand-alone reactive-power inverter, which can reduce the load on the solar inverters and prevent yield losses in the solar power plant.

When there is a lot of sunshine, solar parks feed large amounts of energy into the grid; when there is less sunshine, they naturally feed in considerably less and grid impedance can fluctuate accordingly. One useful means of compensating for the resulting fluctuations in the grid is to provide what is known as reactive power. This is where the new blueplanet 50.0 TL3 RPonly comes in: this AC-coupled inverter from KACO new energy enables operators of solar power plants, or transport networks, to provide the necessary amount of reactive power correction, by day or by night.

The correction value applied at the grid connection point is the crucial factor. This is where the park control system “reads” the measured reactive power. If the measured value deviates from the set-point – which can be set to any value between 100% active and 100% reactive – the blueplanet 50.0 TL3 RPonly inverter or inverters will be requested to supply reactive power to the extent that is required to arrive at the target value once more. Since fluctuations in the grid can result from a range of causes, the application goes beyond solar parks: the blueplanet 50.0 TL3 RPonly can therefore also be used for reactive power compensation in industrial or other large consumer sites.

Reactive power is defined using the phase offset between current and voltage, and is given as the cosine of the angle difference: if the current and voltage are completely in phase (phase angle Phi = 0 degrees), the cosine of Phi is 1, i.e. 100 per cent active power and 0 per cent reactive power is supplied. In contrast, if the current and voltage curves are completely offset (phase angle Phi = 90 degrees), the cosine of Phi has a value 0, so 100 per cent reactive power is supplied to the grid.

As a “phase-shifting” device, the blueplanet 50.0 TL3 RPonly can supply any value of reactive power between 0 and 100 per cent, current leading or lagging. The power is not given in watts (W) or volt-amperes (VA) but in var. As its name suggests, the inverter can supply up to 50 kvar.

By using the RPonly as a purely reactive-power inverter, solar inverters do not have to reduce their own active power in order to match the grid reactive power. Instead, they can continue to feed in solely active power, protecting the park operator from yield losses.

The blueplanet 50.0 TL3 RPonly can be used in new and existing plants, wherever reactive power is required in grid management, perfectly complementing solar inverters from KACO new energy or other manufacturers.

About KACO new energy:
KACO new energy, headquartered in Neckarsulm, Germany is one of the world’s largest manufacturers of inverters for grid-feed solar power. The product line-up covers the full power range, from single units designed for a family home up to complete systems for solar parks producing megawatts of electricity. Since 1999, KACO new energy has supplied inverters with a cumulative power output of 10 gigawatts. This offering has been extended to include solutions for PV self-consumption and energy storage, devices for grid management, as well as products and value-added services for utility-scale projects. KACO new energy is the first company in the photovoltaic industry to achieve CO2-neutral production and in 2014, celebrated the 100th birthday of the original parent company which, at the end of the 1930s, was one of first ever inverter manufacturers.
For more information, visit

Kornelia Lauser
Director Global Marketing & Power Plant Solutions
KACO new energy GmbH
Carl-Zeiss-Str. 1
74172 Neckarsulm
+49 7132 3818-0
+49 7132 3818-703

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