Photovoltaic inverter adjustment based voltage control method of power distribution network

Abstract

The invention discloses a photovoltaic inverter adjustment based voltage control method of a power distribution network, and aims at realizing voltage control of an access point of a photovoltaic power station simply and effectively. The method comprises the following steps that a reactive compensation phase of an inverter voltage control strategy is entered when a node voltage crosses the limit and a power factor angle of an inverter does not reach a capacity limit angle; under the condition of the node voltage crosses the limit, a maximal power adjustment phase of the inverter is entered when the inverter reaches the maximal power but not reach the maximal power factor angle; and under the condition that the node voltage crosses the limit, a power reduction phase of the inverter is entered by keeping the inverter in the maximal power factor angle when the inverter reaches the maximal power factor angle. According to the method, feed line load level and distribution condition can be obtained needless of communication, the voltage can be adjusted rapidly by utilizing the inverter capacity fully, and a good control effect and high economic performance are achieved.

Description

technical field [0001] The invention relates to the technical field of voltage control for grid-connected photovoltaic power plants, in particular to a distribution network voltage control method based on photovoltaic inverter regulation. Background technique [0002] The access of photovoltaic power plants has a great impact on the operation of the distribution network, especially the impact on the voltage rise of the distribution network cannot be ignored, especially when the penetration rate of photovoltaic power plants is high, the voltage at the access point is prone to be too high, As a result, the voltage at this point exceeds the limit. At present, the allowable deviation of the three-phase power supply voltage of 10kV and below is ±7% of the rated voltage. Due to the decisiveness of the external environment on the photovoltaic output and the changing characteristics of the load demand throughout the day, according to the direction and magnitude of the output power o...

AI Technical Summary

Problems solved by technology

[0003] Voltage control is an important daily task of the distribution network. At present, the voltage control of the access point of the photovoltaic power station in the literature is mostly realized through a parallel static var compensator (SVC), but the input SVC cannot be continuously adjusted and there are When the node voltage drops greatly, its reactive power output drops and other disadvantages

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