A method and apparatus for regulating reactive power of a photovoltaic inverter in a photovoltaic power station

Abstract

the invention discloses a method and apparatus for regulating reactive power of a photovoltaic inverter in a photovoltaic power station. The method comprises the following steps: collecting a voltageanalog signal of that photovoltaic power station, calculating the instantaneous value Uinstant of the parallel point voltage and the difference value Uerr between the instantaneous value Uinstant of the parallel point voltage and the expected value of the voltage, If | Uerr | is greater than the dead-time voltage value Uset, calculating the total station inverter reactive power change target valueQerr by a PI control algorithm according to Uerr, and calculating the number N of controllable inverters and the total reactive power target value Qtotal according to the current inverter working state, and distributing the Qtotal to each controllable inverter through communication. The invention also discloses a corresponding regulating device. The invention does not need a data window to calculate the parallel point voltage, and can quickly regulate the parallel point voltage to a preset range, so as to avoid the situation that the voltage of the photovoltaic power station exceeds the limit, and is suitable for practical engineering application.

Description

technical field [0001] The invention relates to the field of new energy generation control, in particular to the reactive power control of a photovoltaic inverter in a photovoltaic power station. Background technique [0002] Photovoltaic power generation has developed rapidly in recent years, and the proportion of photovoltaic installed capacity in some areas is already quite high. The current voltage and reactive power control system cannot meet the current grid operation adjustment requirements due to its slow response speed. , photovoltaics cannot achieve fast reactive power adjustment. In addition, in order to be able to control the bus voltage of the grid-connected point of the photovoltaic power station, the photovoltaic power station needs to be equipped with a certain capacity of SVG equipment, which occupies a large amount of investment costs of the owner in terms of equipment investment and later operation. , the above problems have seriously restricted my country's...

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Problems solved by technology

[0002] Photovoltaic power generation has developed rapidly in recent years, and the proportion of photovoltaic installed capacity in some areas is already quite high. The current voltage and reactive power control system cannot meet the current grid operation adjustment requirements due to its slow response speed. , photovoltaics cannot achieve fast reactive power adjustment. In addition, in order to be able to control the bus voltage of the grid-connected point of the photovoltaic power station, the photovoltaic power station needs to be equipped with a certain capacity of SVG equipment, which occupies a large amount of investment costs of the owner in terms of equipment investment and later operation. , the above problems have seriously restricted my country's utilization of photovoltaics

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