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Method for providing control power for an alternating voltage system by means of an energy-generating plant

A technology for generating equipment and AC voltage, applied in AC network circuits, AC network load balancing, energy storage, etc., can solve problems such as strong fluctuations, predictability of PV power difference, etc.

Pending Publication Date: 2021-08-17
SMA SOLAR TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the variability and poor predictability of the PV power, which can fluctuate strongly, for example in the event of radiation changes and is not available at all especially at night, photovoltaic installations have hitherto only been able to support the supply by providing Regulates power to contribute to stabilizing the AC voltage network

Method used

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  • Method for providing control power for an alternating voltage system by means of an energy-generating plant
  • Method for providing control power for an alternating voltage system by means of an energy-generating plant
  • Method for providing control power for an alternating voltage system by means of an energy-generating plant

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Experimental program
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Embodiment Construction

[0047] figure 1 An energy production plant 2 with a photovoltaic generator 4 and an energy store 5 is shown.

[0048] The photovoltaic generator 4 can generate PV maximum electric power P_MPP according to the current solar radiation. The inverter 4 a draws the current PV power P_PV from the photovoltaic generator 4 , which can be varied between zero and the PV maximum power P_MPP in particular by setting the voltage across the photovoltaic generator 4 . The PV power P_PV can also assume negative values ​​by feeding back electrical power into the photovoltaic generator 4 . A conventional photovoltaic module can easily absorb power on the order of its PV rated power P_Peak. The inverter 4 a converts the PV power P_PV thus exchanged as direct current with the photovoltaic generator 4 into alternating current and exchanges the PV power P_PV with the alternating voltage network 1 via the network connection point 1 a.

[0049] The energy store 5 is connected to a converter 5a, wh...

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Abstract

The invention relates to an energy-generating plant (2) and to a method for providing control power for an alternating voltage system (1) by means of an energy-generating plant (2), the energy-generating plant (2) comprising a photovoltaic generator (4) and a stored energy source (5), the energy-generating plant (2) exchanging a total electrical power (P_Netz) with the alternating voltage system (1), the total power (P_Netz) exchanged being set as a function of a current maximum PV power (P_MPP), a predefinable basic PV power (P_PV_0) between zero and the maximum PV power (P_MPP), and a provided or required control power. The method comprises the following steps: - if no control power is required: feeding in a basic total power (P_Netz_0) comprising the basic PV power (P_PV_0); - if negative control power is required: reducing the PV power (P_PV) in comparison with the basic PV power (P_PV_0); - if positive control power is required: drawing a battery power (P_Batt) from the stored energy source (5) if the required positive control power is greater than the difference between the maximum PV power (P_MPP) and the basic PV power (P_PV_0).

Description

technical field [0001] The invention relates to a method for providing conditioned power to an alternating voltage network by means of an energy generation system with a photovoltaic generator and an energy store. Background technique [0002] In AC voltage networks constructed as cross-area joint networks, deviations of the network frequency from the nominal frequency of the AC voltage network may occur due to an imbalance between the electrical power fed in and the electrical power drawn. Imbalances and thus frequency deviations can thus be counteracted in that the devices feeding in and / or extracting electrical power from the AC voltage network are suitably matched to the devices fed in or extracted from the AC voltage network power. In particular, the fed-in power can be reduced or the extracted power can be increased at frequencies above the rated frequency, and the fed-in power can be increased or the extracted power can be reduced at frequencies below the rated frequ...

Claims

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Application Information

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IPC IPC(8): H02J3/32H02J3/38H02J3/46
CPCH02J3/32H02J3/38H02J3/466H02J2300/24H02J3/241Y02E10/56Y02E70/30H02S40/32H02J3/381
Inventor A·克诺布洛赫
Owner SMA SOLAR TECH AG