A method and device for adjusting reactive power of a photovoltaic inverter in a photovoltaic power station

Abstract

The invention discloses a reactive power adjustment method of a photovoltaic inverter in a photovoltaic power station, which collects the voltage analog signal of the grid-connected point of the photovoltaic power station and calculates the instantaneous value U of the grid-connected point voltage instant And the difference U between the instantaneous value of the grid-connected point voltage and the expected voltage value err , if |U err |greater than the dead zone voltage value U set , then according to U err Using PI control algorithm to calculate the reactive power change target value Q of the total station inverter err , according to the current inverter working status, count the number N of controllable inverters and calculate the total reactive power target value Q total , the Q total It is distributed to each controllable inverter through communication. The invention also discloses a corresponding adjustment device. The invention does not need a data window to calculate the voltage of the grid-connected point, and can quickly adjust the voltage of the grid-connected point to a preset range, avoiding the voltage exceeding the limit of the photovoltaic power station, and is suitable for practical engineering applications.

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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