A method for adjusting the voltage of photovoltaic grid-connected points in different regions

Abstract

The invention discloses a method for adjusting the voltage of a photovoltaic grid-connected point by region, comprising the following steps: (1) setting a voltage fixed value; (2) dividing the region according to the voltage fixed value; (3) judging the region where the photovoltaic grid-connected point voltage is located; (4) According to the results of (3), adjust the voltage of photovoltaic grid-connected points in different regions. The present invention adopts the method of adjusting reactive power first, and then adjusting active power when adjusting reactive power has little influence on system voltage, which solves the problem of different adjustment objects of different access voltage levels, and conforms to the current situation that adjusting reactive power is more economical; Zoning adjustment strategy realizes different adjustment methods in different voltage areas; setting voltage regulation maintenance intervals to avoid frequent triggering of voltage regulation; setting overvoltage and low voltage blocking intervals to avoid false triggering of voltage regulation control when the system fails, thereby aggravating the impact of faults on the system Impact.

Description

technical field [0001] The invention relates to the technical field of new energy power generation control, in particular to a method for regionally adjusting the voltage of photovoltaic grid-connected points. Background technique [0002] With distributed photovoltaic power generation connected to the distribution network, the power flow in the distribution network is no longer a one-way flow from the grid to the load. As the scale of photovoltaics connected to the distribution network increases, the voltage on the feeder will rise or even exceed the allowable range. When the photovoltaic power is small and the load is large, the end of the feeder is more likely to have low voltage and exceed the minimum allowable voltage level. Too high or too low voltage will affect the operation of equipment at the end of the feeder. Therefore, it is of great significance to control the active and reactive output of photovoltaics according to the voltage of the photovoltaic grid connec...

AI Technical Summary

Problems solved by technology

However, different access voltage levels of photovoltaics correspond to different line resistance and reactance ratios. In order to adapt to different access voltage levels and reduce economic losses caused by voltage regulation, a voltage regulation strategy based on reactive power adjustment and a regulation based on power factor adjustment pressure strategy is no longer applicable

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