Distributed photovoltaic variable slope droop control method based on head end voltage tracking

Abstract

The invention discloses a distributed photovoltaic variable slope droop control method based on head end voltage tracking, which is achieved based on a distributed photovoltaic intelligent acquisitiondevice and an intelligent control terminal. The intelligent acquisition device is installed in a transformer substation and is configured to acquire the voltage of a bus at the lower voltage side inthe transformer substation in real time, communicate with all the distributed photovoltaic power stations on a feeder and issue the head end voltage signals. The intelligent control terminal is configured to receive upwards the feeder head end bus voltage signals issued by the intelligent acquisition device and take the feeder head end bus voltage signals as key parameters for setting of a controlstrategy to generate a variable slope droop control curve, is connected with an inverter downwards, and is configured to collect the voltages of grid-connected points of the distributed photovoltaicpower stations to achieve the control for the passive power of the inverter according to the variable slope droop curve. Under the operation condition of the higher line voltage, the photovoltaic inverter is controlled to absorb less reactive power, so that the line loss is reduced while the voltage operation requirement is met; and compared with the traditional full-state observation method, themethod is an ideal engineering practicability method for distributed photovoltaic reactive voltage control.

Description

technical field [0001] The invention relates to a distributed photovoltaic variable slope droop control method based on head-end voltage tracking, and the invention belongs to the technical field of distributed photovoltaic reactive voltage control. Background technique [0002] In recent years, with the vigorous implementation of the photovoltaic poverty alleviation plan, the access capacity of distributed photovoltaics in rural areas has continued to grow, and the problems of power flow reverse transmission and voltage over-limit of distribution network lines in areas with high penetration of distributed photovoltaics have become prominent, which poses a threat to the safe operation of distribution networks. and photovoltaic consumption have had adverse effects, and the control of distribution network voltage over-limit is imminent. [0003] The traditional voltage limit control scheme includes increasing the radius of the wire to reduce the impedance, adding reactive powe...

AI Technical Summary

Problems solved by technology

However, multi-level voltage coordinated optimization control is based on a large number of terminal measurement and control devices, and relies on reliable network communication, which is costly and difficult to implement.

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