A method for automatic control of active power of photovoltaic power plants involving model inverters

Abstract

The invention discloses an automatic control method for the active power of a photovoltaic power station with the participation of a model inverter, which realizes the automatic control of the active power of the photovoltaic power station including the model inverter. Adjust the active power of the model inverter to improve the automatic control level of the photovoltaic power station. Obtain the design parameters of the inverter of the photovoltaic power station, and group the model inverters and non-model inverters; collect and obtain the actual active power P of the grid-connected point of the photovoltaic power station in real time 0 ; Real-time acquisition to obtain the target value P of active power at the grid-connected point of the photovoltaic power station target ; Calculate the active power adjustment change ΔP of the photovoltaic power station; determine whether the active power adjustment change ΔP of the photovoltaic power station is within the range of the active power adjustment dead zone threshold ζ, if the active power adjustment change ΔP is greater than the active power adjustment dead zone threshold ζ. It makes up for the deficiency that the current photovoltaic power station active power control method cannot adjust the model inverter.

Description

technical field [0001] The invention relates to an automatic control method for the active power of a photovoltaic power station, in particular to an automatic control method for the active power of a photovoltaic power station in which a model inverter participates. Background technique [0002] In recent years, with the large-scale construction of photovoltaic power generation, the grid-connected capacity of photovoltaic power generation has continued to increase, and the impact on the safety of power grid operation has become greater and greater. In actual operation, the photovoltaic power station also needs to adjust the active power according to the requirements of the grid scheduling. , "Photovoltaic Theoretical Power Generation and Blocked Electricity Calculation Method" requires the photovoltaic power station to use the model inverter method to calculate its theoretical power and hindered power; the model inverter refers to the photovoltaic power station equipment in...

AI Technical Summary

Problems solved by technology

These two types of control methods have the following defects: (1) manual adjustment has the disadvantages of frequent operation and high labor cost, and the operator needs to manually control the start-stop and power-down of the model inverter according to the scheduling adjustment requirements; (2) when the power grid In the face of an emergency or the inability to accommodate photovoltaic power generation, when the output of the photovoltaic power station is urgently required to quickly drop below the capacity of the model inverter, manual adjustment cannot respond in time, the adjustment error is large, and the control target required by the power grid cannot be achieved, affecting the overall safety and stability of the power grid; (3) The model inverter is treated as an ordinary inverter for indiscriminate adjustment, and the model inverter is not individually grouped for adjustment. Every time the output is adjusted, the model inverter will run in a power-limited mode , the accuracy of theoretical power and blocked power calculated according to its active power will be affected, and the meaning of setting up a model inverter will be lost

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