Photovoltaic system with selective MPP mismatch
First Claim
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1. A method for operating a photovoltaic system having an inverter at whose input terminals a DC output voltage of a photovoltaic generator is applied and whose output is connected to a supply network, and having a battery bank connected by a switch in parallel to the input terminals, the method comprising:
- adjusting a maximum power point of the photovoltaic generator via a regulating element of the inverter; and
operating selectively the photovoltaic generator by setting a voltage value at the input terminals of the inverter, the voltage value and its associated current value are mismatched with respect to the maximum power point of the photovoltaic generator in order to provoke a discharge current from the battery bank to the input terminals of the inverter if a predefinable minimum power of the photovoltaic generator is not achieved,wherein the output of the inverter is continuously connected to the supply network such that an uninterrupted supply of alternating current is provided from the photovoltaic system to the supply network at or above the predefinable minimum power,wherein a voltage measuring sensor is provided in parallel to the battery bank to measure the battery voltage in case of the switch being either open or closed, andwherein the battery, the photovoltaic generator and a DC side of the inverter are simultaneously at a same operating voltage in both a charging state and discharging state.
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Abstract
A method for operating a photovoltaic system provides, with the turning off of the otherwise adjusted regulation to the maximum power point MPP, to make a selective mismatching at the inverter, in order to cause a battery current, which is added to the system current. As a result, an additional energy source to maintain a minimum feed power is achieved during a rapidly changing cloud pattern.
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Citations
16 Claims
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1. A method for operating a photovoltaic system having an inverter at whose input terminals a DC output voltage of a photovoltaic generator is applied and whose output is connected to a supply network, and having a battery bank connected by a switch in parallel to the input terminals, the method comprising:
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adjusting a maximum power point of the photovoltaic generator via a regulating element of the inverter; and operating selectively the photovoltaic generator by setting a voltage value at the input terminals of the inverter, the voltage value and its associated current value are mismatched with respect to the maximum power point of the photovoltaic generator in order to provoke a discharge current from the battery bank to the input terminals of the inverter if a predefinable minimum power of the photovoltaic generator is not achieved, wherein the output of the inverter is continuously connected to the supply network such that an uninterrupted supply of alternating current is provided from the photovoltaic system to the supply network at or above the predefinable minimum power, wherein a voltage measuring sensor is provided in parallel to the battery bank to measure the battery voltage in case of the switch being either open or closed, and wherein the battery, the photovoltaic generator and a DC side of the inverter are simultaneously at a same operating voltage in both a charging state and discharging state. - View Dependent Claims (2, 3, 4, 5, 11, 12)
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6. A method for operating a photovoltaic system having an inverter at whose input terminals a DC output voltage of a photovoltaic generator is applied and whose output is connectable to a supply network, and having a battery bank connected switch in parallel to the input terminals, the method comprising:
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adjusting a maximum power point of the photovoltaic generator via a regulating element of the inverter and operating selectively the photovoltaic generator by setting a voltage value at the input terminals of the inverter, the voltage value and its associated current value are mismatched with respect to the maximum power point of the photovoltaic generator in order to provoke a discharge current from the battery bank to the input terminals of the inverter if a predefinable minimum power of the photovoltaic generator is not achieved, wherein the output of the inverter is continuously connected to the supply network such that an uninterrupted supply of alternating current is provided from the photovoltaic system to the supply network at or above the predefinable minimum power, wherein a voltage measuring sensor is provided in parallel to the battery bank to measure the battery voltage in case of the switch being either open or closed, and wherein a second current measuring sensor is provided in a line between the battery bank and the inverter, and wherein, with a shortfall in a predefined charge state of the battery bank, the connection of a replacement power plant to the supply network is initiated.
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7. A device for operating a photovoltaic generator, the device comprising:
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an inverter, at whose input terminals a DC output voltage of the photovoltaic generator is applied and whose output is connectable to a supply network; a battery bank connectable by a switch in parallel to the input terminals; a regulating element of the inverter configured to adjust a maximum power point of the photovoltaic generator; a disconnect switch through which the battery bank is connected to the inverter; and a control/regulating device that sets the operating point of the photovoltaic generator by the regulating element of the inverter to a predefinable voltage value and that closes the disconnect switch during a shortfall of a predefined minimum power of the photovoltaic system, wherein the output of the inverter is continuously connected to the supply network such that an uninterrupted supply of alternating current is provided from the photovoltaic system to the supply network, wherein the predefinable voltage value and its associated current value are mismatched with respect to the maximum power point of the photovoltaic generator, wherein a voltage measuring sensor is provided in parallel to the battery bank to measure the battery voltage in case of the switch being either open or closed, and wherein the battery, the photovoltaic generator and a DC side of the inverter are simultaneously at a same operating voltage in both a charging, state and discharging state. - View Dependent Claims (8, 9, 10, 13, 14, 15, 16)
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Specification